:root {
  --bg: #eee4cd;
  --bg-deep: #dfd3b7;
  --panel: #fbf4e4;
  --paper: var(--panel);
  --panel-2: #f3ead5;
  --panel-toolbar: #f6edd8;
  --border: rgba(23, 20, 15, 0.11);
  --border-strong: rgba(23, 20, 15, 0.22);
  --border-soft: rgba(21, 20, 15, 0.06);
  --text: #17140f;
  --text-2: rgba(23, 20, 15, 0.70);
  --muted: rgba(23, 20, 15, 0.50);
  --primary: #d95f4d;
  --accent: var(--ink);
  --primary-hover: #bf4f40;
  --primary-ink: #f7f1de;
  --primary-tint: rgba(217, 95, 77, 0.14);
  --primary-tint-soft: rgba(217, 95, 77, 0.07);
  --ink: #17140f;
  --ink-tint: rgba(23, 20, 15, 0.045);
  --ink-tint-strong: rgba(23, 20, 15, 0.085);
  --ink-soft: rgba(23, 20, 15, 0.11);
  --success: #70754b;
  --success-light: #e7e9d5;
  --success-ink: #30351c;
  --success-tint: rgba(112, 117, 75, 0.18);
  --error: #a64b3f;
  --error-light: #efdcd3;
  --error-ink: #54231d;
  --error-tint: rgba(166, 75, 63, 0.18);
  --accent-blue: #526f86;
  --warning: #c98a2b;
  --warning-light: #f2e4c2;
  --shell-dark: #1f1d18;
  --shell-dark-2: #29261f;
  --shell-dark-3: #343027;
  --on-shell: #f0e7d2;
  --on-shell-muted: rgba(240, 231, 210, 0.58);
  --on-shell-border: rgba(240, 231, 210, 0.16);
  --font-display: "Playfair Display", "Source Serif Pro", "Iowan Old Style", "Charter", Georgia, "Songti SC", "STSong", serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", ui-monospace, Menlo, monospace;
  /* 纸面卡:减糊影,加 1px 内描边和柔光,贴纸感 */
  --shadow: 0 1px 0 rgba(23, 20, 15, 0.025), 0 2px 6px -3px rgba(23, 20, 15, 0.08), 0 18px 36px -32px rgba(23, 20, 15, 0.24);
  --shadow-md: 0 12px 28px -22px rgba(23, 20, 15, 0.30);
  --shadow-toolbar: 0 1px 0 rgba(23, 20, 15, 0.025), 0 6px 14px -10px rgba(23, 20, 15, 0.16);
  --radius: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* 全项目隐藏浏览器原生滚动条,保留滚动能力。 */
html,
body,
* {
  scrollbar-width: none;
  -ms-overflow-style: none;
}
html::-webkit-scrollbar,
body::-webkit-scrollbar,
*::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

html, body { min-height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  padding: 24px 20px 48px;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body.modal-open { overflow: hidden; }

/* Paper noise — subtle texture overlay */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 240 240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.08  0 0 0 0 0.08  0 0 0 0 0.06  0 0 0 0.55 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  opacity: 0.07;
  mix-blend-mode: multiply;
}
/* 纸面空间:中上方柔光 + 右下角暗角,让卡片有"立着"的感觉 */
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(255, 255, 255, 0.28), transparent 65%),
    radial-gradient(ellipse 90% 60% at 100% 100%, rgba(21, 20, 15, 0.05), transparent 60%);
}

.app {
  width: min(100%, 1720px);
  max-width: none;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* === Brand / header (poster-style) === */
.header {
  display: grid;
  grid-template-columns: auto minmax(240px, 1fr) auto;
  align-items: center;
  column-gap: 28px;
  row-gap: 8px;
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--border-strong);
  position: relative;
}
.header-tools {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  min-width: 0;
  justify-self: end;
}
.header-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}
.header::after {
  content: "";
  position: absolute; right: 0; bottom: -8px;
  width: 26px;
  height: 3px;
  border-radius: 999px;
  background: var(--primary);
}
.header h1 {
  font-size: 26px; font-weight: 400;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  display: flex; align-items: center; gap: 14px;
}
.header h1 .brand-mark {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  border: 1px solid rgba(169, 79, 59, 0.52);
  border-radius: 14px;
  background: #2f3328;
  color: #fff6e8;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: -0.06em;
  flex-shrink: 0;
  line-height: 1;
  box-shadow:
    inset 0 0 0 3px rgba(255, 246, 232, 0.08),
    0 10px 22px rgba(62, 48, 30, 0.14);
}
.header h1 .brand-mark::after {
  content: "";
  position: absolute;
  right: 9px;
  bottom: 8px;
  width: 14px;
  height: 3px;
  border-radius: 999px;
  background: #d9644b;
}
.header h1 .brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.header h1 .brand-name { font-weight: 600; color: var(--text); }
.header h1 .brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--muted);
  margin-top: 4px;
}

/* === Pseudo page navigation === */
.app-nav {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: -12px 0 18px;
  padding: 5px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.20), rgba(255, 255, 255, 0)),
    rgba(251, 244, 228, 0.62);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.44);
}
.app-nav-tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 6px 15px;
  border-radius: 999px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 650;
  line-height: 1;
  text-decoration: none;
  transition: background-color 0.14s ease, color 0.14s ease, box-shadow 0.14s ease;
}
.app-nav-tab:hover {
  color: var(--text);
  background: var(--ink-tint);
}
.app-nav-tab.active {
  color: var(--primary-ink);
  background: var(--primary);
  box-shadow: 0 6px 14px -12px rgba(23, 20, 15, 0.40), inset 0 1px 0 rgba(255, 255, 255, 0.20);
}
.app-nav-tab:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.app-nav-search {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 30px;
  margin-left: 4px;
  padding: 6px 12px;
  border: 1px solid rgba(184, 111, 75, 0.34);
  border-radius: 999px;
  background: var(--primary-tint-soft);
  color: var(--primary-hover);
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-size: 13px;
  font-weight: 750;
  line-height: 1;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
  transition: transform 0.14s ease, background-color 0.14s ease, border-color 0.14s ease, color 0.14s ease;
}
.app-nav-search:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
  background: rgba(184, 111, 75, 0.18);
  color: var(--primary);
}
.app-nav-search:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.app-nav-search-icon {
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
}
.app-nav-search kbd {
  margin-left: 2px;
  padding: 2px 5px;
  border: 1px solid rgba(23, 20, 15, 0.12);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.24);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
}

.route-view[hidden] { display: none; }
.route-view {
  animation: route-fade-in 180ms ease-out;
}
@keyframes route-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === LLMWiki placeholder views === */
.placeholder-view {
  width: 100%;
  max-width: 980px;
}
#view-wiki {
  width: min(100%, 1680px);
  max-width: none;
  margin-inline: auto;
}
.placeholder-panel {
  padding: 26px;
}
#view-wiki .placeholder-panel {
  padding: 18px;
}
.placeholder-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.placeholder-kicker {
  margin-bottom: 5px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
}
.placeholder-head h2 {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.placeholder-badge {
  flex: 0 0 auto;
  padding: 5px 10px;
  border: 1px dashed var(--border-strong);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}
.placeholder-search,
.placeholder-field {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-bottom: 18px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 650;
}
.placeholder-search input,
.placeholder-field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.18);
  color: var(--text);
  font: inherit;
  line-height: 1.5;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
}
.placeholder-search input {
  min-height: 42px;
  padding: 9px 12px;
}
.placeholder-field textarea {
  resize: vertical;
  min-height: 132px;
  padding: 12px;
}
.placeholder-search input:disabled,
.placeholder-field textarea:disabled {
  opacity: 0.72;
  cursor: not-allowed;
}
.wiki-kind-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: -8px 0 14px;
}
.wiki-kind-tab {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  color: var(--text-2);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 650;
  padding: 7px 12px;
}
.wiki-kind-tab:hover,
.wiki-kind-tab.is-active {
  border-color: var(--primary);
  color: var(--text);
}
.wiki-kind-tab.is-active {
  background: var(--primary-tint-soft);
}
.wiki-search-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: -2px 0 14px;
}
.wiki-search-status {
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.5;
}
.wiki-search-status:empty {
  display: none;
}
.wiki-search-status[data-tone="error"] {
  color: var(--error);
}
.wiki-results-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin: 16px 0 10px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-strong);
}
.wiki-results-head strong {
  display: block;
  margin-top: 4px;
  font-size: 17px;
}
#wiki-results-count {
  min-width: 28px;
  padding: 3px 7px;
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  text-align: center;
}
.wiki-explorer {
  display: grid;
  grid-template-columns: clamp(280px, 22vw, 340px) minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  margin: 0 0 14px;
}
.wiki-tree-panel,
.wiki-content-panel {
  min-width: 0;
}
.wiki-tree-panel {
  position: sticky;
  top: 14px;
  max-height: calc(100vh - 28px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.26), rgba(255, 255, 255, 0.08)),
    rgba(255, 255, 255, 0.14);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.36);
}
.wiki-sidebar-controls {
  flex: 0 0 auto;
  display: grid;
  gap: 10px;
  padding: 12px;
  border-bottom: 1px dashed var(--border);
}
.wiki-sidebar-title {
  margin-bottom: 2px;
}
.wiki-sidebar-title .wiki-card-label {
  margin-bottom: 0;
}
.wiki-sidebar-search {
  gap: 5px;
  margin-bottom: 0;
  font-size: 12px;
}
.wiki-sidebar-search input {
  min-height: 38px;
  padding: 8px 10px;
  border-radius: 9px;
  font-size: 13px;
}
.wiki-tree-panel .wiki-kind-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  margin: 0;
}
.wiki-tree-panel .wiki-kind-tab {
  padding: 6px 7px;
  font-size: 11px;
  text-align: center;
}
.wiki-tree-panel .wiki-search-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 0;
}
.wiki-tree-panel .wiki-search-actions .btn,
.wiki-tree-panel .wiki-search-actions .backup-btn {
  width: 100%;
  justify-content: center;
}
.wiki-tree-panel .wiki-search-status {
  grid-column: 1;
  font-size: 11px;
}
.wiki-tree-panel .wiki-results-head {
  margin: 0;
  padding: 12px 12px 8px;
  border-top: 0;
  border-bottom: 1px dashed var(--border);
}
.wiki-tree-panel .wiki-results-head strong {
  font-size: 14px;
}
.wiki-tree {
  display: block;
  flex: 1 1 auto;
  max-height: none;
  min-height: 0;
  margin: 0;
  padding: 8px;
  overflow: auto;
}
.wiki-tree-subject {
  margin: 2px 0;
}
.wiki-tree-subject-row,
.wiki-tree-item {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  text-align: left;
  transition: background-color 160ms ease, transform 160ms ease, color 160ms ease;
}
.wiki-tree-subject-row {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px;
  padding: 7px 8px;
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
}
.wiki-tree-subject-row:hover,
.wiki-tree-item:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateX(1px);
}
.wiki-tree-subject-row.is-target {
  background: rgba(171, 90, 58, 0.12);
  box-shadow: inset 0 0 0 1px rgba(171, 90, 58, 0.22);
}
.wiki-tree-chevron {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  text-align: center;
}
.wiki-tree-subject-name,
.wiki-tree-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.wiki-tree-count {
  padding: 1px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
}
.wiki-tree-children {
  position: relative;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 1px 0 6px 22px;
  list-style: none;
}
.wiki-tree-children::before {
  content: "";
  position: absolute;
  top: 2px;
  bottom: 8px;
  left: 17px;
  width: 1px;
  background: var(--border);
}
.wiki-tree-leaf {
  min-width: 0;
}
.wiki-tree-item {
  position: relative;
  display: grid;
  grid-template-columns: 16px 15px minmax(0, 1fr);
  align-items: center;
  gap: 5px;
  padding: 6px 8px 6px 0;
  border-radius: 8px;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.35;
}
.wiki-tree-rail {
  height: 1px;
  background: var(--border);
}
.wiki-tree-doc-icon {
  width: 11px;
  height: 13px;
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.18);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.34);
}
.wiki-tree-item.is-selected {
  background: var(--primary-tint-soft);
  color: var(--text);
  font-weight: 700;
}
.wiki-tree-item.is-selected::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 5px;
  bottom: 5px;
  width: 3px;
  border-radius: 999px;
  background: var(--primary);
}
.wiki-tree-subject-row:focus-visible,
.wiki-tree-item:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.wiki-content-panel {
  min-height: calc(100vh - 36px);
  min-width: 0;
}
.wiki-content-panel .wiki-note-preview {
  min-height: calc(100vh - 36px);
}
.wiki-result-list {
  display: grid;
  gap: 18px;
  margin-bottom: 14px;
}
.wiki-result-list.wiki-tree {
  display: block;
  gap: 0;
  margin-bottom: 0;
}
.wiki-subject-group {
  display: grid;
  gap: 10px;
}
.wiki-subject-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 2px 8px;
  border-bottom: 1px solid var(--border);
}
.wiki-subject-head h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.wiki-subject-head span {
  flex: 0 0 auto;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
}
.wiki-result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.wiki-result {
  width: 100%;
  min-height: 172px;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0)),
    var(--panel-2);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.36);
  transition: border-color 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease;
}
.wiki-result:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42), 0 10px 20px -18px rgba(23, 20, 15, 0.35);
}
.wiki-result:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.wiki-result-meta,
.wiki-result-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.wiki-result-meta {
  margin-bottom: 9px;
}
.wiki-result-meta span,
.wiki-result-tags i {
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-style: normal;
  letter-spacing: 0.08em;
}
.wiki-result strong {
  display: block;
  margin-bottom: 7px;
  font-size: 15px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.wiki-result-snippet,
.wiki-result-path {
  display: block;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.65;
}
.wiki-result-path {
  margin: 7px 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.wiki-result-snippet {
  display: -webkit-box;
  min-height: 42px;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}
.wiki-result-tags {
  margin-top: 9px;
}
.wiki-empty,
.wiki-error {
  padding: 22px;
  border: 1px dashed var(--border-strong);
  border-radius: 9px;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.7;
  background: rgba(255, 255, 255, 0.12);
}
.wiki-error {
  color: var(--error);
}
.wiki-note-preview {
  margin: 0 0 22px;
  padding: 22px 24px;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.24);
  box-shadow: 0 18px 45px -36px rgba(23, 20, 15, 0.45);
}
.wiki-welcome {
  position: relative;
  display: grid;
  align-content: start;
  gap: 16px;
  width: 100%;
  max-width: none;
  min-height: 420px;
}
.wiki-welcome-hero {
  display: grid;
  justify-items: center;
  gap: 20px;
  padding: 8px 4px 2px;
  text-align: center;
}
.wiki-welcome-copy {
  display: grid;
  justify-items: center;
  gap: 4px;
}
.wiki-welcome h3 {
  max-width: 720px;
  margin: 6px 0 10px;
  color: var(--text);
  font-family: var(--font-display);
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.04;
  letter-spacing: -0.05em;
}
.wiki-welcome p {
  max-width: 42ch;
  margin: 0;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.7;
}
.wiki-welcome-quick {
  display: grid;
  justify-items: center;
  gap: 16px;
  width: min(100%, 920px);
  min-height: 0;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0) 40%),
    var(--panel);
  text-align: center;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.55);
}
.wiki-welcome-quick-head {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}
.wiki-welcome-quick span,
.wiki-welcome-quick small {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.wiki-welcome-quick b {
  color: var(--text);
  font-size: 15px;
}
.wiki-welcome-chart-shell {
  display: grid;
  justify-items: center;
  gap: 14px;
  width: 100%;
}
.wiki-welcome-chart-wrap {
  display: grid;
  justify-items: center;
  gap: 18px;
  width: 100%;
}
.wiki-welcome-chart-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: min(100%, 300px);
  aspect-ratio: 1;
}
.wiki-welcome-chart {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.58);
}
.wiki-welcome-chart-core {
  position: absolute;
  inset: 70px;
  z-index: 2;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 5px;
  border-radius: 50%;
  background: var(--panel);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.58);
}
.wiki-welcome-chart-core strong {
  color: var(--primary);
  font-family: var(--font-display);
  font-size: clamp(42px, 5vw, 58px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.05em;
}
.wiki-welcome-chart-core b {
  color: var(--text);
  font-size: 16px;
  line-height: 1.2;
}
.wiki-welcome-chart-core small,
.wiki-welcome-chart-core span {
  text-align: center;
  letter-spacing: 0.04em;
}
.wiki-welcome-chart-core small {
  font-size: 10px;
}
.wiki-welcome-chart-core span {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
}
.wiki-welcome-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
  width: 100%;
}
.wiki-welcome-legend-item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 58px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.08)),
    rgba(255, 255, 255, 0.18);
  text-align: left;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
}
.wiki-welcome-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
}
.wiki-welcome-legend-copy {
  display: grid;
  gap: 3px;
  min-width: 0;
}
.wiki-welcome-legend-item b {
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.wiki-welcome-legend-item small {
  display: block;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
}
.wiki-welcome-legend-item strong {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
}
.wiki-welcome-section {
  display: grid;
  gap: 12px;
  margin-top: 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel);
}
.wiki-welcome-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--text);
  font-size: 13px;
}
.wiki-welcome-section-head span {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
}
.wiki-welcome-subjects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px;
}
.wiki-welcome-subject {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 74px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.24);
  color: var(--text);
  text-align: left;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
}
.wiki-welcome-subject span {
  display: grid;
  gap: 3px;
  min-width: 0;
}
.wiki-welcome-subject b {
  overflow: hidden;
  color: var(--text);
  font-size: 15.5px;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.wiki-welcome-subject small {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
}
.wiki-welcome-subject strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: rgba(171, 90, 58, 0.14);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
}
.wiki-welcome-subject:nth-child(2) strong { background: rgba(78, 128, 118, 0.15); }
.wiki-welcome-subject:nth-child(3) strong { background: rgba(92, 105, 168, 0.15); }
.wiki-welcome-subject:nth-child(4) strong { background: rgba(202, 146, 62, 0.18); }
.wiki-welcome-subject:nth-child(5) strong { background: rgba(142, 92, 132, 0.14); }
.wiki-preview-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.wiki-preview-head strong {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  line-height: 1.35;
}
.wiki-preview-head-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.wiki-preview-head span,
.wiki-preview-path {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
}
.wiki-preview-close,
.wiki-preview-action {
  flex: 0 0 auto;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
  color: var(--text);
  cursor: pointer;
}
.wiki-preview-action {
  background: rgba(174, 123, 64, 0.10);
  color: var(--text);
}
.wiki-preview-action:hover,
.wiki-preview-close:hover {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.34);
}
.wiki-preview-save {
  border-color: rgba(174, 123, 64, 0.35);
  background: rgba(174, 123, 64, 0.18);
}
.wiki-preview-danger {
  border-color: rgba(160, 74, 64, 0.28);
  color: #8f3d34;
}
.wiki-preview-action:disabled,
.wiki-preview-close:disabled {
  cursor: wait;
  opacity: 0.55;
}
.wiki-preview-meta,
.wiki-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}
.wiki-preview-meta span,
.wiki-preview-tags i {
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-style: normal;
  letter-spacing: 0.08em;
}
.wiki-preview-path {
  margin-bottom: 8px;
  overflow-wrap: anywhere;
}
.wiki-preview-body {
  margin-top: 12px;
  font-size: 15.5px;
  line-height: 1.62;
  color: var(--text-2);
}
.wiki-preview-body h1,
.wiki-preview-body h2,
.wiki-preview-body h3,
.wiki-preview-body h4 {
  color: var(--text);
  font-family: var(--font-display);
  line-height: 1.25;
  letter-spacing: -0.015em;
}
.wiki-preview-body h1 { margin: 6px 0 14px; font-size: 30px; }
.wiki-preview-body h2 {
  margin: 20px 0 8px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  font-size: 22px;
}
.wiki-preview-body h3 { margin: 14px 0 6px; font-size: 18px; }
.wiki-preview-body h4 { margin: 12px 0 5px; font-size: 16px; }
.wiki-preview-body p {
  margin: 6px 0 9px;
  color: var(--text-2);
  font-size: 15.5px;
  line-height: 1.62;
}
.wiki-preview-body strong { color: var(--text); font-weight: 700; }
.wiki-preview-body ul,
.wiki-preview-body ol {
  margin: 6px 0 10px 1.05em;
  padding-left: 0.9em;
}
.wiki-preview-body li { margin: 3px 0; }
.wiki-preview-body code {
  padding: 0 2px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.94em;
}
.wiki-preview-body pre {
  overflow-x: auto;
  margin: 12px 0 16px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(35, 31, 24, 0.06);
}
.wiki-preview-body pre code {
  padding: 0;
  border: 0;
  background: transparent;
}
.wiki-preview-body blockquote {
  margin: 12px 0;
  padding: 8px 12px;
  border-left: 3px solid var(--primary);
  background: rgba(255, 255, 255, 0.20);
  color: var(--text-2);
}
.wiki-preview-body .ai-table-wrap { overflow-x: auto; margin: 12px 0 16px; }
.wiki-preview-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.wiki-preview-body th,
.wiki-preview-body td {
  border: 1px solid var(--border);
  padding: 7px 9px;
  text-align: left;
  vertical-align: top;
}
.wiki-preview-body th { color: var(--text); background: rgba(255, 255, 255, 0.25); }
.wiki-preview-body .md-callout {
  margin: 12px 0 16px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.22);
}
.wiki-preview-body .md-callout-title {
  margin-bottom: 5px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.wiki-preview-body .md-callout-body { color: var(--text-2); }
.wiki-preview-body .katex,
.wiki-preview-body .katex * {
  background: transparent !important;
  border: 0 !important;
  box-shadow: none !important;
}
.wiki-preview-body .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  margin: 8px 0 10px;
  padding: 2px 0;
  background: transparent;
}
.wiki-preview-body > :first-child {
  margin-top: 0;
}
.wiki-preview-body > :last-child {
  margin-bottom: 0;
}
.wiki-note-preview p {
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.7;
}
.wiki-preview-fallback {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.7;
}
.wiki-followup-card {
  position: relative;
  overflow: hidden;
  margin-top: 22px;
  padding: 16px;
  border: 1px solid rgba(190, 150, 98, 0.26);
  border-radius: 16px;
  background:
    radial-gradient(circle at 0% 0%, rgba(232, 168, 93, 0.12), transparent 34%),
    linear-gradient(135deg, rgba(255, 253, 247, 0.86), rgba(252, 244, 229, 0.78)),
    rgba(255, 250, 240, 0.66);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
}
.wiki-followup-card::before {
  content: "";
  position: absolute;
  inset: 16px auto 16px 0;
  width: 3px;
  border-radius: 0 999px 999px 0;
  background: linear-gradient(180deg, rgba(224, 98, 78, 0.58), rgba(214, 153, 74, 0.58));
}
.wiki-followup-head {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.wiki-followup-head h3 {
  margin: 0 0 4px;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.wiki-followup-head p {
  margin: 0;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.55;
}
.wiki-followup-head span {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid rgba(214, 153, 74, 0.30);
  border-radius: 999px;
  background: rgba(246, 231, 203, 0.46);
  color: #9b6230;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
}
.wiki-followup-label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.wiki-followup-quick-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 10px;
}
.wiki-followup-quick {
  appearance: none;
  border: 1px solid rgba(190, 150, 98, 0.34);
  border-radius: 12px;
  padding: 6px 12px;
  background: rgba(255, 252, 246, 0.72);
  color: #6d5135;
  font: inherit;
  font-size: 12px;
  line-height: 1.25;
  cursor: pointer;
  box-shadow: inset 0 -1px 0 rgba(174, 123, 64, 0.06);
  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease;
}
.wiki-followup-quick:hover {
  border-color: rgba(214, 153, 74, 0.56);
  background: rgba(255, 245, 226, 0.88);
  color: #3f2b1d;
  box-shadow: 0 4px 12px rgba(146, 92, 39, 0.08), inset 0 -1px 0 rgba(174, 123, 64, 0.08);
}
.wiki-followup-quick:active {
  transform: translateY(1px);
  background: rgba(247, 228, 196, 0.82);
}
.wiki-followup-quick:focus-visible {
  outline: none;
  border-color: rgba(224, 98, 78, 0.46);
  box-shadow: 0 0 0 3px rgba(224, 98, 78, 0.10);
}
.wiki-followup-quick:disabled {
  cursor: wait;
  opacity: 0.62;
}
.wiki-followup-input {
  display: block;
  width: 100%;
  min-height: 90px;
  resize: vertical;
  padding: 11px 12px;
  border: 1px solid rgba(190, 150, 98, 0.24);
  border-radius: 12px;
  outline: none;
  background: rgba(255, 255, 255, 0.62);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  line-height: 1.6;
}
.wiki-followup-input:focus {
  border-color: rgba(224, 98, 78, 0.36);
  box-shadow: 0 0 0 3px rgba(224, 98, 78, 0.08);
}
.wiki-followup-input:disabled {
  cursor: wait;
  opacity: 0.72;
}
.wiki-followup-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.wiki-followup-actions .wiki-followup-ask {
  border-color: rgba(224, 98, 78, 0.28);
  background: rgba(224, 98, 78, 0.08);
  color: #7b3b32;
}
.wiki-followup-actions .wiki-followup-ask:hover {
  border-color: rgba(224, 98, 78, 0.42);
  background: rgba(224, 98, 78, 0.12);
}
.wiki-followup-actions .wiki-followup-save {
  border-color: rgba(190, 150, 98, 0.40);
  background: rgba(246, 231, 203, 0.54);
  color: #5f452b;
}
.wiki-followup-actions .wiki-preview-action:disabled {
  cursor: not-allowed;
}
.wiki-followup-status {
  color: var(--muted);
  font-size: 12px;
}
.wiki-followup-status[data-tone="error"] {
  color: var(--error);
}
.wiki-followup-answer {
  margin-top: 12px;
  padding: 12px;
  border: 1px dashed rgba(190, 150, 98, 0.26);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.34);
}
.wiki-followup-empty {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}
.wiki-followup-answer-body {
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.65;
}
.wiki-followup-answer-body h1,
.wiki-followup-answer-body h2,
.wiki-followup-answer-body h3,
.wiki-followup-answer-body h4 {
  color: var(--text);
  font-family: var(--font-display);
  line-height: 1.25;
}
.wiki-followup-answer-body h1 { margin: 4px 0 12px; font-size: 24px; }
.wiki-followup-answer-body h2 { margin: 16px 0 8px; font-size: 20px; }
.wiki-followup-answer-body h3 { margin: 14px 0 6px; font-size: 17px; }
.wiki-followup-answer-body h4 { margin: 12px 0 5px; font-size: 15px; }
.wiki-followup-answer-body p { margin: 6px 0 9px; }
.wiki-followup-answer-body ul,
.wiki-followup-answer-body ol {
  margin: 6px 0 10px 1.05em;
  padding-left: 0.9em;
}
.wiki-followup-answer-body li { margin: 3px 0; }
.wiki-followup-answer-body code {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.94em;
}
.wiki-followup-answer-body pre {
  overflow-x: auto;
  margin: 12px 0 16px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(35, 31, 24, 0.06);
}
.wiki-followup-answer-body blockquote {
  margin: 12px 0;
  padding: 8px 12px;
  border-left: 3px solid var(--primary);
  background: rgba(255, 255, 255, 0.20);
}
.wiki-followup-answer-body .ai-table-wrap {
  overflow-x: auto;
  margin: 12px 0 16px;
}
.wiki-followup-answer-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.wiki-followup-answer-body th,
.wiki-followup-answer-body td {
  border: 1px solid var(--border);
  padding: 7px 9px;
  text-align: left;
  vertical-align: top;
}
.wiki-followup-answer-body > :first-child { margin-top: 0; }
.wiki-followup-answer-body > :last-child { margin-bottom: 0; }
.wiki-editor-wrap {
  margin-top: 12px;
}
.wiki-editor {
  width: 100%;
  min-height: 52vh;
  resize: vertical;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  outline: none;
  background: rgba(255, 255, 255, 0.32);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.24);
}
.wiki-editor:focus {
  border-color: rgba(174, 123, 64, 0.48);
  box-shadow: 0 0 0 3px rgba(174, 123, 64, 0.12);
}
.wiki-editor-hint {
  margin: 8px 2px 0;
  color: var(--muted);
  font-size: 12px;
}
.wiki-card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.wiki-card {
  min-height: 150px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0)),
    var(--panel-2);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
}
.wiki-card-label {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}
.wiki-card strong {
  display: block;
  margin-bottom: 7px;
  font-size: 15px;
  line-height: 1.35;
}
.wiki-card p,
.placeholder-copy {
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.7;
}
.placeholder-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 10px 0 18px;
}
.guide-view {
  width: min(100%, 1120px);
  max-width: none;
  margin-inline: auto;
}
.guide-panel {
  overflow: visible;
}
.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 300px);
  gap: 20px;
  align-items: stretch;
  padding: 24px;
  border: 1px solid rgba(171, 90, 58, 0.16);
  border-radius: 20px;
  background:
    radial-gradient(circle at 14% 10%, rgba(171, 90, 58, 0.16), transparent 34%),
    linear-gradient(135deg, rgba(255,255,255,0.34), rgba(171,90,58,0.08));
  margin-bottom: 20px;
}
.guide-hero h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(28px, 3.2vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}
.guide-hero p {
  max-width: 680px;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.75;
}
.guide-flow {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.24);
  border: 1px dashed rgba(171, 90, 58, 0.22);
}
.guide-flow span {
  padding: 9px 12px;
  border-radius: 999px;
  background: rgba(171, 90, 58, 0.10);
  color: #783b30;
  font-weight: 700;
  text-align: center;
}
.guide-flow i {
  width: 1px;
  height: 16px;
  margin: 0 auto;
  background: rgba(171, 90, 58, 0.32);
}
.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}
.guide-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.36), rgba(255,255,255,0.12));
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.42);
}
.guide-card span {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--primary);
  letter-spacing: 0.16em;
}
.guide-card h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
}
.guide-card p,
.guide-kind-head p,
.guide-kind-card p,
.guide-kind-card li,
.guide-section li {
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.72;
}
.guide-kind-section {
  margin: 0 0 18px;
  padding: 20px;
  border-radius: 18px;
  border: 1px solid rgba(171, 90, 58, 0.15);
  background:
    linear-gradient(135deg, rgba(171, 90, 58, 0.09), rgba(255,255,255,0.16)),
    rgba(255,255,255,0.14);
}
.guide-kind-head h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: -0.02em;
}
.guide-kind-head p {
  max-width: 820px;
  margin: 0 0 16px;
}
.guide-kind-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.guide-kind-card {
  padding: 16px;
  border-radius: 16px;
  border: 1px dashed rgba(171, 90, 58, 0.22);
  background: rgba(255,255,255,0.22);
}
.guide-kind-card strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 22px;
  color: #783b30;
}
.guide-kind-card ul {
  margin: 10px 0 0;
  padding-left: 18px;
}
.guide-kind-card li + li {
  margin-top: 6px;
}
.guide-section {
  padding: 18px 20px;
  border: 1px dashed var(--border-strong);
  border-radius: 16px;
  background: rgba(255,255,255,0.18);
}
.guide-section h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 24px;
}
.guide-section ul,
.guide-section ol {
  margin: 0;
  padding-left: 20px;
}
.guide-section li + li {
  margin-top: 8px;
}
.guide-doc-layout {
  --guide-accent: var(--primary-hover);
  --guide-accent-deep: var(--error-ink);
  --guide-accent-soft: var(--primary-tint);
  --guide-sage: var(--success);
  --guide-sage-soft: var(--success-light);
  --guide-surface: var(--panel);
  --guide-surface-strong: var(--panel);
  --guide-line: var(--border);
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}
.guide-doc-sidebar {
  position: sticky;
  top: 16px;
  display: flex;
  flex-direction: column;
  height: auto;
  max-height: calc(100vh - 32px);
  overflow: hidden;
  padding: 18px;
  border: 1px solid var(--guide-line);
  border-radius: 18px;
  background: var(--guide-surface);
  box-shadow: inset 4px 0 0 var(--guide-accent), 0 14px 34px rgba(92, 68, 43, 0.08);
}
.guide-doc-sidebar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--guide-line);
}
.guide-doc-sidebar-head span {
  color: var(--guide-accent-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}
.guide-doc-sidebar-head strong {
  color: var(--guide-sage);
  font-family: var(--font-display);
  font-size: 20px;
}
.guide-doc-nav {
  display: grid;
  flex: 1 1 auto;
  gap: 4px;
  margin: 14px 0 0;
  min-height: 0;
  max-height: calc(100vh - 230px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: rgba(169, 79, 59, 0.30) transparent;
}
.guide-doc-nav::-webkit-scrollbar { width: 5px; }
.guide-doc-nav::-webkit-scrollbar-track { background: transparent; }
.guide-doc-nav::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(169, 79, 59, 0.28);
}
.guide-doc-nav button {
  appearance: none;
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  color: var(--text-2);
  font: inherit;
  font-weight: 700;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease, transform 0.16s ease;
}
.guide-doc-nav button:hover,
.guide-doc-nav button:focus-visible,
.guide-doc-nav button.is-active {
  background: var(--guide-accent-soft);
  border-color: rgba(169, 79, 59, 0.18);
  color: var(--guide-accent-deep);
  outline: none;
}
.guide-doc-nav button.is-active {
  box-shadow: inset 4px 0 0 var(--guide-accent);
}
.guide-doc-nav button:active {
  transform: translateY(1px);
}
.guide-doc-note {
  flex: 0 0 auto;
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--guide-line);
  color: #77624c;
  font-size: 12px;
  line-height: 1.7;
}
.guide-doc-content {
  display: grid;
  gap: 18px;
  min-width: 0;
}
.guide-doc-section {
  position: relative;
  overflow: hidden;
  padding: 26px 30px;
  border: 1px solid var(--guide-line);
  border-top: 5px solid var(--guide-accent);
  border-radius: 20px;
  background: var(--guide-surface);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.55);
}
.guide-doc-section[hidden] {
  display: none;
}
.guide-doc-section.is-active {
  animation: guide-card-in 0.18s ease-out;
}
@keyframes guide-card-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.guide-doc-intro {
  background: var(--guide-surface);
}
.guide-doc-kicker {
  display: inline-flex;
  align-items: center;
  margin: 0 0 10px;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--guide-sage-soft);
  color: var(--guide-sage);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
}
.guide-doc-section h3 {
  margin: 0 0 14px;
  color: var(--guide-accent-deep);
  font-family: var(--font-display);
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}
.guide-doc-section h3::after {
  content: "";
  display: block;
  width: 42px;
  height: 4px;
  margin-top: 12px;
  border-radius: 999px;
  background: var(--guide-accent);
}
.guide-doc-section h4 {
  margin: 0 0 8px;
  color: var(--guide-accent-deep);
  font-family: var(--font-display);
  font-size: 22px;
}
.guide-doc-section p,
.guide-doc-section li,
.guide-doc-section dd {
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.82;
}
.guide-doc-section p {
  max-width: 78ch;
  margin: 0 0 14px;
}
.guide-doc-lead {
  font-size: 17px !important;
  line-height: 1.85 !important;
}
.guide-doc-section ul,
.guide-doc-section ol {
  margin: 0;
  padding-left: 22px;
}
.guide-doc-section li + li {
  margin-top: 8px;
}
.guide-doc-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}
.guide-doc-flow span {
  padding: 12px;
  border: 1px solid rgba(169, 79, 59, 0.18);
  border-radius: 14px;
  background: var(--guide-accent-soft);
  color: var(--guide-accent-deep);
  font-weight: 800;
  text-align: center;
}
.guide-doc-flow span:nth-child(even) {
  border-color: rgba(111, 118, 80, 0.26);
  background: var(--guide-sage-soft);
  color: #4f5935;
}
.guide-doc-list {
  display: grid;
  gap: 0;
  margin: 16px 0;
  border-top: 1px solid var(--guide-line);
}
.guide-doc-list div {
  display: grid;
  grid-template-columns: minmax(112px, 0.28fr) minmax(0, 1fr);
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(169, 79, 59, 0.14);
}
.guide-doc-list dt {
  color: var(--guide-accent-deep);
  font-weight: 900;
}
.guide-doc-list dd {
  margin: 0;
}
.guide-doc-callout {
  max-width: none !important;
  margin: 18px 0 0 !important;
  padding: 14px 16px;
  border-left: 4px solid var(--guide-accent);
  border-radius: 14px;
  background: var(--guide-accent-soft);
}
.guide-doc-two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 16px 0;
}
.guide-doc-two-col section {
  padding: 18px;
  border: 1px dashed rgba(169, 79, 59, 0.26);
  border-radius: 16px;
  background: var(--guide-surface-strong);
}
.guide-doc-two-col section:nth-child(even) {
  border-color: rgba(111, 118, 80, 0.30);
  background: var(--guide-sage-soft);
}
.guide-doc-section,
.guide-doc-nav button,
.guide-doc-two-col section,
.guide-doc-flow span,
.guide-doc-list div,
.guide-doc-callout,
.placeholder-panel,
.placeholder-head,
.panel {
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background-color 160ms ease, opacity 160ms ease;
}
.guide-doc-nav button:hover,
.guide-doc-nav button:focus-visible {
  transform: translateX(1px);
}
.guide-doc-two-col section:hover,
.guide-doc-flow span:hover,
.guide-doc-callout:hover,
.guide-doc-section:hover,
.placeholder-panel:hover,
.placeholder-head:hover,
.panel:hover {
  transform: translateY(-1px);
}

@media (min-width: 1100px) {
  .wiki-result-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .guide-hero,
  .guide-grid,
  .guide-kind-grid {
    grid-template-columns: 1fr;
  }
  .guide-flow {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .guide-flow i {
    display: none;
  }
  .guide-doc-layout,
  .guide-doc-two-col {
    grid-template-columns: 1fr;
  }
  .guide-doc-sidebar {
    position: relative;
    top: auto;
    display: block;
    height: auto;
    max-height: none;
    overflow: visible;
  }
  .guide-doc-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-height: none;
    overflow: visible;
    padding-right: 0;
  }
  .guide-doc-section {
    padding: 20px;
  }
  .guide-doc-flow {
    grid-template-columns: 1fr 1fr;
  }
  .guide-doc-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .wiki-explorer {
    grid-template-columns: 1fr;
  }
  .wiki-tree-panel {
    position: static;
    max-height: none;
  }
  .wiki-content-panel,
  .wiki-content-panel .wiki-note-preview {
    min-height: 420px;
  }
  .wiki-tree {
    max-height: 48vh;
  }
  .wiki-result-grid {
    grid-template-columns: 1fr;
  }
  .wiki-subject-head h3 {
    font-size: 18px;
  }
  .wiki-result {
    min-height: 0;
  }
  .wiki-preview-head {
    flex-direction: column;
  }
  .wiki-preview-head-actions {
    width: 100%;
    justify-content: space-between;
  }
  .wiki-welcome-quick {
    padding: 18px 16px 16px;
  }
  .wiki-welcome h3 {
    font-size: clamp(28px, 8vw, 42px);
  }
  .wiki-welcome-chart-stage {
    width: min(100%, 264px);
  }
  .wiki-welcome-chart-core {
    inset: 60px;
  }
  .wiki-welcome-legend {
    grid-template-columns: 1fr;
  }
}

.header-stats {
  display: flex;
  align-items: stretch;
  gap: 0;
  font-size: 9px;
  color: var(--muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  justify-self: end;
}
.header-stats > span {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  padding: 0 10px;
  border-left: 1px dashed var(--border);
}
.header-stats > span:first-child { border-left: none; padding-left: 0; }
.header-stats > span:last-child  { padding-right: 0; }
.header-stats strong {
  display: block;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 16px; font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 2px;
  text-transform: none;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}

/* === Panel (bone card) === */
.panel {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.24), rgba(255, 255, 255, 0) 40%),
    var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.55);
  padding: 20px 22px;
  margin-bottom: 16px;
  position: relative;
}

/* === Control panel: collapse toggle === */
.panel-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  gap: 14px;
}
.panel-head-label {
  display: inline-flex; align-items: baseline; gap: 10px;
  color: var(--text);
  line-height: 1;
  white-space: nowrap;
  flex-shrink: 0;
}
.panel-head-zh {
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 650;
  font-size: 28px;
  letter-spacing: -0.03em;
  color: var(--text);
}
.panel-head-en {
  font-family: 'JetBrains Mono', monospace;
  font-style: normal;
  font-weight: 500;
  font-size: 10px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-2);
  transform: translateY(-4px);
}
.panel-head-label::before {
  content: ""; display: inline-block;
  width: 24px; height: 2px; background: var(--primary);
  align-self: center; flex: 0 0 auto;
  transform: translateY(-2px);
  margin-right: 2px;
}
.panel-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.12em;
  cursor: pointer;
  transition: all 0.15s ease;
}
.panel-toggle:hover { color: var(--ink); border-color: var(--border-strong); background: var(--ink-tint); }
.panel-toggle svg { width: 11px; height: 11px; transition: transform 0.2s ease; }
.panel-toggle.is-collapsed svg { transform: rotate(180deg); }

/* === Layout: sidebar + main === */
.layout {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.sidebar {
  width: 232px;
  flex-shrink: 0;
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: none;  /* 完全隐藏滚动条 */
}
/* Sidebar 内部 panel 收紧:head 不再塞 NAVIGATE / gap 收紧 / padding 收窄,
   因为 sidebar 只有 232px,横向预算吃紧 */
.sidebar .panel {
  padding: 16px 14px;
  /* 比主 panel 略厚一点,有 inset shadow,像夹在题册里的硬书签 */
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.55), inset 0 0 0 1px rgba(21, 20, 15, 0.02);
}
.sidebar .panel-head { gap: 6px; margin-bottom: 12px; padding-bottom: 12px; }
.sidebar .panel-head-en { display: none; }
.sidebar .panel-toggle { padding: 3px 8px; font-size: 10px; }
.sidebar::-webkit-scrollbar { display: none; }
.main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: row;
  gap: 20px;
  align-items: flex-start;
}
/* 主区左侧栈:问题卡 + 备份栏 上下堆 */
.quiz-stack {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
/* === AI rail (right side panel) === */
.ai-rail {
  width: 360px;
  flex-shrink: 0;
  position: sticky;
  top: 16px;
  display: flex;
  flex-direction: column;
  align-self: flex-start;  /* 内容尺寸,跟左侧列脱钩,切题不缩放 */
  scrollbar-width: none;
}
.ai-rail::-webkit-scrollbar { display: none; }
/* 桌面 AI 栏默认折叠为明确的可操作入口。 */
.ai-rail.is-collapsed {
  width: 44px;
  overflow: visible;
}
.ai-rail.is-collapsed .ai-shell { display: none; }
.ai-rail.is-collapsed::after { display: none; }
.ai-rail-reopen {
  display: none;
  width: 44px;
  min-height: 142px;
  padding: 14px 0;
  border: 1px solid rgba(239, 231, 210, 0.12);
  border-radius: var(--radius);
  background: var(--shell-dark);
  color: var(--on-shell);
  font-family: var(--font-mono);
  cursor: pointer;
  box-shadow: 0 14px 36px -28px rgba(21, 20, 15, 0.55);
  align-items: center;
  justify-content: center;
  gap: 10px;
  writing-mode: vertical-rl;
  transition: background-color 0.15s, color 0.15s, transform 0.15s;
}
.ai-rail-reopen span { font-size: 12px; font-weight: 800; letter-spacing: 0.08em; }
.ai-rail-reopen small { color: var(--on-shell-muted); font-size: 10px; letter-spacing: 0.22em; }
.ai-rail-reopen:hover,
.ai-rail-reopen:focus-visible { background: var(--shell-dark-2); color: var(--primary); transform: translateX(-2px); }
.ai-rail-reopen:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
.ai-rail.is-collapsed .ai-rail-reopen { display: flex; }
/* === Sidebar group sections === */
.side-group {
  border-top: 1px dashed var(--border);
  padding: 4px 0 2px;
}
.side-group:first-child { border-top: none; padding-top: 2px; }
.side-group-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 12px 6px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.side-group-label::before {
  content: "";
  width: 12px;
  height: 1.5px;
  background: var(--ink);
  flex-shrink: 0;
}
.side-chapter {
  padding: 4px 12px 8px;
  position: relative;
}
.chapter-picker {
  position: relative;
}
.chapter-trigger {
  width: 100%;
  min-width: 0;
  min-height: 42px;
  padding: 8px 34px 8px 12px;
  font-size: 12.5px;
  font-family: 'Inter Tight', 'PingFang SC', system-ui, sans-serif;
  font-weight: 650;
  color: var(--text);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(23, 20, 15, 0.14);
  border-radius: 7px;
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.24);
  transition: border-color 0.14s ease, background-color 0.14s ease, box-shadow 0.14s ease;
  position: relative;
}
.chapter-trigger span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding-right: 8px;
}
.chapter-trigger::after {
  content: "";
  position: absolute;
  right: 13px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: translateY(-65%) rotate(45deg);
  transition: transform 0.14s ease;
}
.chapter-picker.is-open .chapter-trigger::after {
  transform: translateY(-35%) rotate(225deg);
}
.chapter-trigger:hover,
.chapter-trigger:focus {
  outline: none;
  border-color: rgba(217, 95, 77, 0.48);
  background: rgba(255, 255, 255, 0.20);
  box-shadow: 0 0 0 3px rgba(217, 95, 77, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.28);
}
.chapter-menu {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 8px);
  z-index: 30;
  padding: 6px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0)),
    #f8efdc;
  border: 1px solid rgba(23, 20, 15, 0.18);
  border-radius: 8px;
  box-shadow: 0 18px 34px -26px rgba(23, 20, 15, 0.46), inset 0 1px 0 rgba(255, 255, 255, 0.38);
  max-height: min(320px, calc(100vh - 160px));
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(23, 20, 15, 0.22) transparent;
}
.chapter-menu::-webkit-scrollbar { display: block; width: 6px; }
.chapter-menu::-webkit-scrollbar-thumb { background: rgba(23, 20, 15, 0.20); border-radius: 999px; }
.chapter-menu[hidden] { display: none; }
.chapter-item {
  width: 100%;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-2);
  padding: 9px 10px;
  font: 600 13px/1.25 'Inter Tight', 'PingFang SC', system-ui, sans-serif;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 8px;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.chapter-item span:first-child {
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chapter-item:hover {
  background: rgba(23, 20, 15, 0.055);
  color: var(--text);
}
.chapter-item.active {
  background: rgba(217, 95, 77, 0.10);
  color: var(--text);
}
.chapter-item.active::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
  flex: 0 0 auto;
  transform: translateY(-1px);
}
.chapter-item-count {
  margin-left: auto;
  color: var(--muted);
  font: 500 9.5px/1 var(--font-mono);
  flex: 0 0 auto;
}
.chapter-picker.is-disabled .chapter-trigger {
  opacity: 0.55;
  cursor: default;
}
.limit-picker {
  position: relative;
}
.limit-trigger {
  min-height: 38px;
}
.limit-menu {
  position: static;
  margin-top: 6px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

/* === Book entries (vertical light rows / bookmark feel) === */
.book-tabs {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 0;
}
.book-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 12px 9px 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  font-family: 'Inter Tight', 'PingFang SC', 'Hiragino Sans GB', system-ui, sans-serif;
  letter-spacing: 0.01em;
  transition: background 0.12s, color 0.12s, transform 0.15s, border-color 0.15s;
  text-align: left;
  position: relative;
  width: 100%;
}
.book-entry::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--ink);
  border-radius: 1px;
  transition: height 0.18s ease, background 0.18s ease;
}
.book-entry:hover {
  background: var(--primary-tint-soft);
  border-color: var(--border);
  color: var(--text);
  transform: translateX(2px);
}
.book-entry:hover::before { height: 55%; }
.book-entry.active {
  background: rgba(217, 95, 77, 0.075);
  border-color: rgba(217, 95, 77, 0.22);
  color: var(--text);
  font-weight: 600;
  overflow: hidden;
}
.book-entry.active::before { height: 70%; background: var(--primary); width: 3px; }
.book-entry.active::after { display: none; }
.book-entry .be-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.book-entry .be-count {
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--muted);
  font-weight: 400;
  flex-shrink: 0;
  letter-spacing: 0.04em;
  opacity: 0.8;
}
.book-entry.active .be-count { color: var(--text-2); opacity: 0.9; }
.book-entry .be-mini {
  display: inline-flex;
  gap: 6px;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted);
  font-weight: 400;
}
.book-entry .be-mini span:empty { display: none; }

/* === Controls row inside sidebar === */
.controls-row {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0;
  border-top: 1px dashed var(--border);
}
.controls-row .mode-btn {
  width: 100%;
  text-align: left;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 13px;
  font-weight: 500;
  font-family: 'Inter Tight', 'PingFang SC', system-ui, sans-serif;
  background-color: transparent;
  color: var(--text-2);
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
}
.controls-row .mode-btn {
  padding: 9px 14px;
}
.controls-row .mode-btn:hover {
  background-color: var(--primary-tint-soft);
  border-color: var(--border);
  color: var(--text);
}

.controls-row .mode-btn.active {
  background: var(--primary-tint-soft);
  color: var(--text);
  font-weight: 600;
}
.controls-row .limit-trigger {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(23, 20, 15, 0.14);
  color: var(--text);
  font-weight: 650;
  padding: 8px 34px 8px 12px;
}
.controls-row .limit-trigger:hover,
.controls-row .limit-trigger:focus {
  background: rgba(255, 255, 255, 0.20);
  border-color: rgba(217, 95, 77, 0.48);
  box-shadow: 0 0 0 3px rgba(217, 95, 77, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

/* === Mode tabs (vertical rows in sidebar) === */
.mode-tabs {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}
.mode-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 9px 14px 9px 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  font-family: 'Inter Tight', 'PingFang SC', system-ui, sans-serif;
  cursor: pointer;
  position: relative;
  /* 左侧强调条:默认 0 高度,激活态拉到 60% */
  box-shadow: inset 0 0 0 0 transparent;
  transition: background 0.15s, color 0.15s, box-shadow 0.18s ease, transform 0.12s;
  text-align: left;
}
.mode-btn:hover {
  background: var(--primary-tint-soft);
  border-color: var(--border);
  color: var(--text);
  box-shadow: inset 2px 0 0 rgba(217, 95, 77, 0.22);
}
.mode-btn.active {
  background: rgba(217, 95, 77, 0.075);
  border-color: rgba(217, 95, 77, 0.24);
  color: var(--text);
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--primary);
}
.mode-btn.active:hover {
  background: rgba(217, 95, 77, 0.10);
}
/* 视觉分组:顺序/随机是刷题顺序,错题/收藏/未做是筛选
   在错题按钮上方加一条细分隔线,做视觉切分 */
.mode-btn[data-mode="wrong"] {
  margin-top: 6px;
  padding-top: 14px;  /* 给分隔线让位 */
}
.mode-btn[data-mode="wrong"]::before {
  content: "";
  position: absolute;
  left: 12px; right: 12px;
  top: 0;
  height: 1px;
  background: var(--border);
}
.mode-btn[data-mode="favorite"] { margin-top: 2px; }
.mode-btn[data-mode="unattempted"] { margin-top: 2px; }
.mode-btn .badge {
  display: inline-flex;
  align-items: center;
  margin-left: 0;
  padding: 1px 7px;
  background: rgba(21, 20, 15, 0.07);
  color: var(--text-2);
  border-radius: 999px;
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 500;
  flex-shrink: 0;
  letter-spacing: 0.02em;
  transition: background 0.15s, color 0.15s;
}
.mode-btn:hover .badge { background: rgba(21, 20, 15, 0.10); }
.mode-btn.active .badge {
  background: var(--primary);
  color: var(--primary-ink);
  font-weight: 600;
}
.mode-btn-danger {
  color: var(--error);
}
.mode-btn-danger:hover { background: var(--error-light); color: var(--error); }
.mode-btn-danger svg { flex-shrink: 0; }

/* === Responsive: ≤1024px 桌面 → AI 卡片排在题目下方 === */
@media (max-width: 1024px) {
  .main { flex-direction: column; }
  .quiz-stack { width: 100%; }
  .wiki-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ai-rail {
    position: static;
    width: 100%;
    max-height: none;
    transform: none;
    z-index: auto;
  }
  .ai-rail::before { display: none; }
  .ai-rail.is-open { transform: none; }
  .ai-rail.is-collapsed { width: 100%; overflow: visible; cursor: default; }
  .ai-rail-reopen { display: none !important; }
  .ai-rail.is-collapsed .ai-shell { display: block; }
  .ai-rail.is-collapsed::after { display: none; }
  .ai-shell { width: 100%; }
  .ai-output-area { max-height: 460px; }
  .ai-rail:not(.is-open) .ai-body { display: none; }
  .ai-rail:not(.is-open) .ai-head {
    border-bottom: 0;
    cursor: pointer;
  }
  .ai-rail:not(.is-open) .ai-title small::after {
    content: " · 点开";
    color: var(--primary);
  }
}

/* === Responsive: stack at narrow widths === */
@media (max-width: 760px) {
  .app-nav {
    display: flex;
    width: 100%;
  }
  .app-nav-tab {
    flex: 1 1 0;
  }
  .app-nav-search {
    flex: 1 1 100%;
    width: 100%;
    margin-left: 0;
    margin-top: 4px;
  }
  .layout { flex-direction: column; gap: 12px; }
  .sidebar {
    width: 100%;
    position: static;
    max-height: none;
  }
  .book-tabs {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  .book-entry {
    flex: 1 1 calc(50% - 3px);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 7px 12px;
  }
  .book-entry::before { display: none; }
  .mode-tabs { flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .mode-btn {
    flex: 1 1 calc(50% - 3px);
    border: 1px solid var(--border);
    border-radius: 999px;
  }
}

/* === Question area === */
#quiz-area.panel {
  padding: 22px 24px;
}
#quiz-area.panel:hover {
  transform: none;
}
.q-meta {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; color: var(--muted);
  margin-bottom: 18px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--border);
  gap: 12px;
}
.q-meta .q-pos {
  font-weight: 600;
  color: var(--text);
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 13px;
  font-family: 'Inter Tight', 'PingFang SC', 'Hiragino Sans GB', system-ui, sans-serif;
  font-variant-numeric: tabular-nums;
}
.q-meta .q-pos strong {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.005em;
  color: var(--text);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.q-meta .q-pos::before {
  content: "";
  display: inline-block;
  width: 20px; height: 1.5px;
  background: var(--primary);
  align-self: center;
  flex-shrink: 0;
}
.q-meta .q-pos .q-pos-total {
  font-family: 'Inter Tight', 'PingFang SC', 'Hiragino Sans GB', system-ui, sans-serif;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.q-meta .q-source {
  color: var(--text-2);
  font-size: 11px;
  text-transform: none;
  letter-spacing: 0.04em;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: 'Inter Tight', 'PingFang SC', system-ui, sans-serif;
}
.q-meta .img-toggle {
  flex-shrink: 0;
  display: inline-flex; align-items: center; gap: 5px;
  margin-left: 12px;
  padding: 3px 9px;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  font-weight: 500;
}
.q-meta .img-toggle:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.q-meta .img-toggle.is-off {
  color: var(--muted);
  border-color: var(--border);
  background: rgba(21, 20, 15, 0.03);
}
.q-meta .img-toggle.is-off:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: transparent;
}
.q-meta .img-toggle svg {
  width: 12px; height: 12px;
  stroke: currentColor; fill: none;
  stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
}
.q-stem.imgs-hidden img { display: none; }

.q-stem {
  font-size: 17px;
  font-weight: 400;
  max-width: 78ch;
  margin: 0 0 24px;
  padding: 8px 0 8px 18px;
  border-left: 1.5px solid var(--ink);
  white-space: pre-wrap;
  line-height: 1.8;
  color: var(--text);
  transition: border-color 0.18s, background-color 0.18s;
}
/* 答题反馈闪光:题面左线 + 题卡本体同时给视觉信号,克制不破坏纸面感 */
.q-stem.flash-correct {
  border-left-color: var(--success);
  background: linear-gradient(90deg, var(--success-light) 0%, transparent 65%);
}
.q-stem.flash-wrong {
  border-left-color: var(--error);
  background: linear-gradient(90deg, var(--error-light) 0%, transparent 65%);
}
.q-stem.flash-info {
  border-left-color: var(--ink);
  background: linear-gradient(90deg, var(--ink-tint) 0%, transparent 65%);
}
#quiz-area { transition: box-shadow 0.18s ease-out; }
#quiz-area.bloom { animation: qcard-bloom 0.55s ease-out; }
@keyframes qcard-bloom {
  0%   { box-shadow: 0 0 0 0 rgba(110, 116, 72, 0.30); }
  60%  { box-shadow: 0 0 0 10px rgba(110, 116, 72, 0.10); }
  100% { box-shadow: 0 0 0 0 rgba(110, 116, 72, 0); }
}
@media (prefers-reduced-motion: reduce) {
  #quiz-area.bloom { animation: none; }
}
/* 题面 / 解析 / 选项里的围栏代码块(纸面装订框) */
.q-stem pre.q-code, .opt-text pre.q-code, .fb-expl pre.q-code {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.20), rgba(255, 255, 255, 0)),
    var(--paper);
  border: 1px dashed rgba(23, 20, 15, 0.18);
  border-radius: 6px;
  padding: 10px 12px 10px 14px;
  margin: 10px 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text);
  overflow-x: visible;
  /* 长代码在容器宽度内自然折行,短代码保持一行 */
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  position: relative;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
}
/* 有 data-lang 时给语言标签让出顶部 26px,避免跟代码挤一起 */
.q-stem pre.q-code[data-lang], .opt-text pre.q-code[data-lang], .fb-expl pre.q-code[data-lang] {
  padding-top: 30px;
}
.q-stem pre.q-code::before, .opt-text pre.q-code::before, .fb-expl pre.q-code::before {
  content: "";
  position: absolute;
  top: 8px; left: 8px;
  width: 6px; height: 6px;
  background: var(--ink);
  box-shadow:
    0 0 0 1px var(--paper),
    10px 0 0 var(--ink),
    10px 0 0 1px var(--paper),
    20px 0 0 var(--ink),
    20px 0 0 1px var(--paper);
  opacity: 0.7;
}
.q-stem pre.q-code[data-lang]::after, .opt-text pre.q-code[data-lang]::after, .fb-expl pre.q-code[data-lang]::after {
  content: attr(data-lang);
  position: absolute;
  top: 6px; right: 10px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--bg);
  padding: 1px 6px;
  border-radius: 3px;
}
.q-stem pre.q-code code, .opt-text pre.q-code code, .fb-expl pre.q-code code {
  background: transparent;
  border: 0;
  padding: 0;
  font-family: inherit;
  color: inherit;
  font-size: inherit;
}

/* === Options === */
.options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 22px; }
.option {
  display: flex; align-items: flex-start; gap: 14px;
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0.08)),
    rgba(255, 255, 255, 0.18);
  font-size: 15px;
  font-family: inherit;
  text-align: left;
  appearance: none;
  position: relative;
  min-height: 50px;
  color: var(--text);
  /* 给选项纸面感:一道浅 ink tint 兜底,跟 panel 区分开但仍贴脸 */
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}
.option:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--primary) 62%, transparent);
  outline-offset: 2px;
}
.option:disabled { opacity: 1; }
.option::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 999px;
  background: transparent;
  transition: background-color 0.16s ease, top 0.16s ease, bottom 0.16s ease;
}
.option:hover:not(.disabled):not(.selected):not(.correct):not(.wrong) {
  border-color: rgba(21, 20, 15, 0.32);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.36), rgba(255, 255, 255, 0.12)),
    rgba(255, 255, 255, 0.24);
  box-shadow: 0 8px 18px -18px rgba(23, 20, 15, 0.35);
  transform: translateY(-1px);
}
.option.selected {
  border-color: rgba(217, 95, 77, 0.42);
  background: linear-gradient(90deg, var(--primary-tint), rgba(255, 255, 255, 0.13));
  box-shadow: inset 0 0 0 1px rgba(217, 95, 77, 0.08);
}
.option.selected::before {
  top: 8px;
  bottom: 8px;
  background: var(--primary);
}
.option.correct {
  border-color: rgba(110, 116, 72, 0.45);
  background: linear-gradient(90deg, var(--success-light), rgba(255, 255, 255, 0.12));
  color: var(--success-ink);
}
.option.correct::before { background: var(--success); }
.option.wrong {
  border-color: rgba(168, 71, 58, 0.45);
  background: linear-gradient(90deg, var(--error-light), rgba(255, 255, 255, 0.12));
  color: var(--error-ink);
}
.option.wrong::before { background: var(--error); }
.option.disabled { cursor: not-allowed; }
.option .opt-letter {
  width: 26px; height: 26px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  font-weight: 700;
  font-size: 13px;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--text-2);
  background: var(--paper);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  line-height: 1;
}
.option:hover:not(.disabled):not(.selected):not(.correct):not(.wrong) .opt-letter {
  color: var(--text);
  border-color: var(--ink-soft);
}
.option.selected .opt-letter {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-ink);
}
.option.correct .opt-letter {
  background: var(--success);
  border-color: var(--success);
  color: var(--paper);
}
.option.wrong .opt-letter {
  background: var(--error);
  border-color: var(--error);
  color: var(--paper);
}
.option .opt-text { flex: 1; white-space: pre-wrap; padding-top: 2px; line-height: 1.65; }
.option-result {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  margin-top: 1px;
  border-radius: 50%;
  color: var(--paper);
  font: 800 14px/1 system-ui, sans-serif;
}
.option-result.correct { background: var(--success); }
.option-result.wrong { background: var(--error); }

/* === Question images === */
.q-img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 10px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  cursor: zoom-in;
}
.q-img-missing {
  display: inline-block;
  padding: 4px 10px;
  margin: 8px 0;
  background: var(--warning-light);
  color: #6e4715;
  border: 1px dashed var(--warning);
  border-radius: var(--radius);
  font-size: 12px;
}
.q-img-zoom {
  position: fixed; inset: 0;
  background: rgba(21, 20, 15, 0.88);
  display: flex; align-items: center; justify-content: center;
  z-index: 200; cursor: zoom-out; padding: 20px;
}
.q-img-zoom img { max-width: 96vw; max-height: 92vh; object-fit: contain; background: white; border-radius: 2px; }

/* Tables inside questions */
.q-stem table, .opt-text table, .fb-expl table {
  border-collapse: collapse;
  margin: 8px 0;
  font-size: 14px;
}
.q-stem table td, .q-stem table th,
.opt-text table td, .opt-text table th,
.fb-expl table td, .fb-expl table th {
  border: 1px solid var(--border-strong);
  padding: 5px 12px;
  text-align: center;
}

/* KaTeX */
.katex { font-size: 1.05em; }
.katex-display { margin: 10px 0 !important; }
.q-stem .katex-display,
.opt-text .katex-display,
.fb-expl .katex-display {
  padding: 7px 10px;
  border-left: 2px solid rgba(217, 95, 77, 0.42);
  background: rgba(217, 95, 77, 0.045);
}
.ai-output .katex,
.ai-output .katex-display {
  color: var(--on-shell);
}
.ai-output .katex-display {
  padding: 8px 10px;
  background: rgba(240, 231, 210, 0.055);
  border: 1px dashed var(--on-shell-border);
  border-radius: 6px;
}

/* === Action buttons === */
.actions {
  display: flex; gap: 8px; flex-wrap: wrap; margin: 20px 0 0;
  align-items: center;
  padding: 16px 0 4px;
  border-top: 1px dashed var(--border);
}
.actions-secondary {
  margin-top: 4px;
  border-top: none;
  padding-top: 0;
}
.action-spacer { margin-left: auto; }
.action-hint {
  color: var(--muted);
  font-size: 11.5px;
  align-self: center;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-2);
  background: rgba(21, 20, 15, 0.03);
}
.status-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink);
}
.status-pill.correct {
  border-color: var(--success);
  color: var(--success-ink);
  background: var(--success-light);
}
.status-pill.correct::before { background: var(--success); }
.status-pill.wrong {
  border-color: var(--error);
  color: var(--error-ink);
  background: var(--error-light);
}
.status-pill.wrong::before { background: var(--error); }
.btn {
  min-height: 38px;
  padding: 8px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.20), rgba(255, 255, 255, 0)), var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  font-weight: 500;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  display: inline-flex; align-items: center; gap: 6px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.btn:hover:not(:disabled) {
  border-color: var(--border-strong);
  background: var(--ink-tint);
  color: var(--ink);
  transform: translateY(-1px);
  box-shadow: 0 8px 16px -16px rgba(23, 20, 15, 0.35);
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0)), var(--ink);
  color: var(--primary-ink);
  border-color: var(--ink);
  font-weight: 600;
  padding: 9px 20px;
  box-shadow: 0 1px 0 rgba(21, 20, 15, 0.04);
}
.btn-primary:hover:not(:disabled) {
  background: var(--text);
  border-color: var(--text);
  color: var(--primary-ink);
}
/* 提交 + 下一题 仍用 primary,但用 primary 里的"accent 提色" 提示这是主操作 */
.btn-primary.btn-accent {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.13), rgba(255, 255, 255, 0)), var(--primary);
  border-color: var(--primary);
  color: var(--primary-ink);
}
.btn-primary.btn-accent:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}
.btn-secondary {
  background: rgba(21, 20, 15, 0.04);
  color: var(--text);
  border-color: var(--border-strong);
  font-weight: 600;
  padding: 8px 16px;
}
.btn-secondary:hover:not(:disabled) {
  background: var(--ink-tint-strong);
  border-color: var(--ink-soft);
  color: var(--ink);
}
.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-2);
  padding: 8px 12px;
  font-weight: 500;
}
.btn-ghost:hover:not(:disabled) {
  background: var(--ink-tint);
  border-color: transparent;
  color: var(--ink);
}
.btn {
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}
.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn-fav {
  color: var(--warning);
  border-color: var(--warning-light);
  background: rgba(201, 138, 43, 0.04);
}
.btn-fav:hover:not(:disabled) {
  border-color: var(--warning);
  background: rgba(201, 138, 43, 0.10);
}
.btn-fav.active {
  background: var(--warning);
  color: var(--paper);
  border-color: var(--warning);
  font-weight: 600;
}
.btn.is-loading { opacity: 0.7; pointer-events: none; }

/* === Feedback === */
.feedback {
  padding: 16px 18px;
  border-radius: var(--radius);
  margin: 8px 0 22px;
  font-size: 14px;
  display: none;
  border: 1px solid;
  background: var(--panel);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.32);
}
.feedback.show {
  display: block;
  animation: feedback-in 0.18s ease-out;
}
.feedback.correct {
  background: linear-gradient(90deg, var(--success-light), rgba(251, 244, 228, 0.72));
  color: var(--success-ink);
  border-color: var(--success);
  border-left-width: 3px;
}
.feedback.wrong {
  background: linear-gradient(90deg, var(--error-light), rgba(251, 244, 228, 0.72));
  color: var(--error-ink);
  border-color: var(--error);
  border-left-width: 3px;
}
.feedback.info {
  background: linear-gradient(90deg, var(--ink-tint-strong), rgba(251, 244, 228, 0.72));
  color: var(--text);
  border-color: var(--ink);
  border-left-width: 3px;
}
.feedback .fb-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: -0.01em;
}
.feedback-ai-action {
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: inherit;
  padding: 3px 0;
  font: 700 11px/1.2 var(--font-mono);
  letter-spacing: 0.05em;
  cursor: pointer;
}
.feedback-ai-action:hover,
.feedback-ai-action:focus-visible { color: var(--primary-hover); }
.feedback-ai-action:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
.feedback .fb-answer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  color: inherit;
}
.feedback .fb-answer span {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}
.feedback .fb-answer small {
  color: var(--muted);
  font: 700 10px/1 var(--font-mono);
  letter-spacing: 0.08em;
}
.feedback .fb-expl {
  margin-top: 10px; padding-top: 10px;
  border-top: 1px dashed rgba(21, 20, 15, 0.18);
  white-space: pre-wrap;
  font-size: 13px;
  line-height: 1.72;
}
.fb-expl-title {
  display: block;
  margin-bottom: 6px;
  font: 700 11px/1.2 var(--font-mono);
  letter-spacing: 0.08em;
}
@keyframes feedback-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.study-tools {
  padding: 12px 18px;
  background: var(--panel-toolbar);
  box-shadow: var(--shadow-toolbar), inset 0 1px 0 rgba(255, 255, 255, 0.55);
}
.backup-row {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}
.backup-note {
  margin-right: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.backup-note::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(110, 116, 72, 0.18);
}
.backup-btn {
  padding: 5px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s ease;
}
.backup-btn:hover {
  border-color: var(--ink-soft);
  color: var(--ink);
  background: var(--ink-tint);
}
/* === AI helper (dark console panel) === */
.ai-shell {
  border: 1px solid rgba(239, 231, 210, 0.10);
  background:
    radial-gradient(circle at 18% 0%, rgba(217, 95, 77, 0.08), transparent 32%),
    var(--shell-dark);
  color: var(--on-shell);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 14px 36px -28px rgba(21, 20, 15, 0.55);
  display: flex;
  flex-direction: column;
}

/* 反馈卡 / AI 面板 弹出动画已关闭(用户偏好直接显隐) */
.ai-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  background: linear-gradient(180deg, rgba(52, 48, 39, 0.88), var(--shell-dark));
  border-bottom: 1px dashed var(--on-shell-border);
}
.ai-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--on-shell);
  font-weight: 600;
  letter-spacing: -0.005em;
  min-width: 0;
  flex: 1;
}
.ai-title::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: none;
  flex-shrink: 0;
}
.ai-title-main {
  white-space: nowrap;
  flex-shrink: 0;
}
.ai-title small {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--on-shell-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  flex: 0 1 auto;
}
.ai-close {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--on-shell-border);
  background: transparent;
  color: var(--on-shell-muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.ai-close:hover {
  color: var(--on-shell);
  border-color: rgba(240, 231, 210, 0.28);
  background: rgba(240, 231, 210, 0.05);
}
.ai-head-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}
.chapter-trigger:focus-visible,
.chapter-item:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.ai-gear {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--on-shell-border);
  background: transparent;
  color: var(--on-shell-muted);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.ai-gear:hover {
  color: var(--on-shell);
  border-color: rgba(240, 231, 210, 0.28);
  background: rgba(240, 231, 210, 0.05);
}
.ai-gear.active {
  background: var(--primary);
  color: var(--primary-ink);
  border-color: var(--primary);
}
.ai-cfg {
  padding: 12px 14px;
  border-bottom: 1px dashed var(--on-shell-border);
  background: var(--shell-dark-2);
}
.ai-cfg[hidden] { display: none; }
.ai-cfg-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: flex-end;
}
.ai-cfg-row + .ai-cfg-row { margin-top: 8px; }
.ai-cfg-row label {
  flex: 1 1 140px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font: 10px/1 var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--on-shell-muted);
}
.ai-cfg-row input,
.ai-cfg-row select {
  border: 1px solid var(--on-shell-border);
  border-radius: 8px;
  background: var(--paper);
  color: var(--text);
  padding: 7px 10px;
  font: 12px/1.3 var(--font-mono);
  width: 100%;
  min-width: 0;
}
.ai-cfg-row input:focus,
.ai-cfg-row select:focus { outline: 2px solid var(--primary-tint); outline-offset: 1px; border-color: var(--primary); }
.ai-cfg-actions { align-items: center; }
.ai-cfg-hint {
  font: 11px/1.55 var(--font-mono);
  color: var(--on-shell-muted);
  letter-spacing: 0.04em;
}
.ai-body {
  padding: 14px;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
}
/* AI 输出区域容器:回到固定阅读窗，内容过长时内部滚动 */
.ai-output-area {
  flex: 1 1 260px;
  min-height: 180px;
  max-height: 520px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  border: 1px solid rgba(240, 231, 210, 0.13);
  border-radius: calc(var(--radius) - 4px);
  background:
    linear-gradient(180deg, rgba(240, 231, 210, 0.045), rgba(240, 231, 210, 0.018)),
    var(--shell-dark-2);
  scrollbar-width: thin;
  scrollbar-color: rgba(240, 231, 210, 0.22) transparent;
}
.ai-output-area::-webkit-scrollbar { width: 6px; }
.ai-output-area::-webkit-scrollbar-track { background: transparent; }
.ai-output-area::-webkit-scrollbar-thumb {
  background: rgba(240, 231, 210, 0.18);
  border-radius: 999px;
}
.ai-output-area::-webkit-scrollbar-thumb:hover { background: rgba(240, 231, 210, 0.28); }
.ai-context {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 9px 12px;
  margin-bottom: 12px;
  background: rgba(240, 231, 210, 0.035);
  border: 1px dashed var(--on-shell-border);
  border-radius: 8px;
}
.ai-context-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.ai-context-row-source { color: var(--on-shell); }
.ai-context-row-state {
  justify-content: space-between;
  color: var(--on-shell-muted);
  font-size: 10.5px;
}
.ai-context-rule {
  display: inline-block;
  width: 3px;
  height: 16px;
  background: var(--primary);
  border-radius: 1px;
  flex-shrink: 0;
}
.ai-context-icon {
  width: 14px;
  height: 14px;
  color: var(--on-shell-muted);
  flex-shrink: 0;
}
.ai-context-source {
  font: 11px/1.3 var(--font-mono);
  color: var(--on-shell);
  letter-spacing: 0.04em;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ai-context-dot {
  color: var(--on-shell-muted);
  flex-shrink: 0;
  font: 11px/1 var(--font-mono);
}
.ai-context-state {
  font: 10px/1 var(--font-mono);
  color: var(--on-shell-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}
.ai-copy-inline {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px 5px 8px;
  border: 1px solid var(--on-shell-border);
  border-radius: 999px;
  background: transparent;
  color: var(--on-shell);
  font: 10px/1 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}
.ai-copy-inline svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}
.ai-copy-inline:hover {
  background: var(--primary);
  color: var(--primary-ink);
  border-color: var(--primary);
}
.ai-save-concept {
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 72%, transparent);
}
.ai-save-concept:hover {
  color: var(--primary-ink);
}
.ai-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.ai-output {
  flex: 0 0 auto;
  min-height: 100%;
  box-sizing: border-box;
  padding: 16px 18px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--on-shell);
  font-size: 12.5px;
  line-height: 1.65;
  word-break: break-word;
}
/* === AI 栏空态:装饰性金句/提示 === */
.ai-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  text-align: center;
  padding: 24px 20px;
  -webkit-user-select: none;
  user-select: none;
}
.ai-empty-mark {
  font-family: var(--font-display);
  font-size: 32px;
  font-style: italic;
  color: var(--on-shell-muted);
  opacity: 0.35;
  letter-spacing: 0.2em;
  margin-bottom: 18px;
  line-height: 1;
}
.ai-empty-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--on-shell);
  max-width: 280px;
  letter-spacing: 0.01em;
}
.ai-empty-author {
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--on-shell-muted);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  margin-top: 8px;
  opacity: 0.75;
}
.ai-empty-rule {
  width: 28px;
  height: 1px;
  background: var(--on-shell-border);
  margin: 20px 0 14px;
}
.ai-empty-hint {
  font: 10.5px/1.5 var(--font-mono);
  color: var(--on-shell-muted);
  letter-spacing: 0.06em;
  opacity: 0.7;
  max-width: 240px;
}
.ai-empty-prompts {
  width: 100%;
  max-width: 340px;
  display: grid;
  gap: 12px;
  margin-top: 18px;
}
.ai-empty-prompt-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.ai-empty-prompt-title {
  grid-column: 1 / -1;
  text-align: left;
  color: var(--on-shell-muted);
  font: 9.5px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: -1px;
}
.ai-empty-prompt {
  border: 1px dashed var(--on-shell-border);
  border-radius: 999px;
  background: rgba(240, 231, 210, 0.035);
  color: rgba(240, 231, 210, 0.76);
  padding: 8px 10px;
  font: 11px/1.2 var(--font-mono);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s, transform 0.15s;
}
.ai-empty-prompt:hover {
  background: rgba(217, 95, 77, 0.18);
  border-color: var(--primary);
  color: var(--on-shell);
  transform: translateY(-1px);
}
.ai-output > :first-child { margin-top: 0; }
.ai-output > :last-child  { margin-bottom: 0; }
.ai-output.is-streaming > :last-child::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 1em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: rgba(239, 231, 210, 0.5);
  animation: aiCursor 1s steps(2, end) infinite;
}
@keyframes aiCursor { 50% { opacity: 0; } }
.ai-output p  { margin: 8px 0; }
.ai-output h1,
.ai-output h2,
.ai-output h3,
.ai-output h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 14px 0 8px;
  line-height: 1.3;
  color: var(--on-shell);
}
.ai-output h1 { font-size: 18px; }
.ai-output h2 { font-size: 16px; padding-bottom: 4px; border-bottom: 1px dashed var(--on-shell-border); }
.ai-output h3 { font-size: 14.5px; }
.ai-output h4 { font-size: 13px; color: var(--on-shell-muted); }
.ai-output ul,
.ai-output ol { margin: 8px 0; padding-left: 24px; }
.ai-output li { margin: 3px 0; }
.ai-output li > p { margin: 2px 0; }
.ai-output .ai-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 10px 0;
  border: 1px solid rgba(240, 231, 210, 0.16);
  border-radius: 8px;
  scrollbar-width: none;
}
.ai-output .ai-table-wrap::-webkit-scrollbar { display: none; }
.ai-output table {
  width: 100%;
  min-width: 0;
  table-layout: fixed;
  border-collapse: collapse;
  background: rgba(10, 9, 7, 0.14);
  font-size: 12.5px;
  line-height: 1.55;
}
.ai-output th,
.ai-output td {
  border: 1px solid rgba(240, 231, 210, 0.14);
  padding: 7px 9px;
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.ai-output th {
  color: var(--on-shell);
  background: rgba(240, 231, 210, 0.08);
  font-weight: 600;
}
.ai-output code {
  font: 12px/1.5 var(--font-mono);
  padding: 1px 6px;
  background: rgba(240, 231, 210, 0.07);
  border: 1px solid rgba(240, 231, 210, 0.15);
  border-radius: 3px;
  color: var(--on-shell);
}
.ai-output pre {
  position: relative;
  margin: 10px 0;
  padding: 14px 14px 12px 16px;
  background: rgba(10, 9, 7, 0.22);
  border: 1px dashed rgba(240, 231, 210, 0.18);
  border-radius: 8px;
  overflow-x: visible;
  font: 12.5px/1.7 var(--font-mono);
  color: var(--on-shell);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  tab-size: 2;
}
.ai-output pre::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 10px;
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 1px;
  box-shadow: 10px 0 0 rgba(240, 231, 210, 0.58), 0 8px 0 0 rgba(240, 231, 210, 0.58), 10px 8px 0 0 var(--primary);
  opacity: 0.9;
}
.ai-output pre code { background: none; padding: 0; color: inherit; font: inherit; }
.ai-output pre[data-lang]::after {
  content: attr(data-lang);
  position: absolute;
  top: 6px;
  right: 10px;
  font: 9.5px/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-shell-muted);
  background: rgba(31, 29, 24, 0.88);
  padding: 3px 6px;
  border-radius: 3px;
  border: 1px solid var(--on-shell-border);
}
.ai-output pre[data-lang] { padding-right: 12px; }
/* 语法高亮 token — 沿用 Atelier Zero 配色: 珊瑚(关键字) / 橄榄(字符串) / 墨黑(常规) / 灰(注释/运算符) */
.tok-kw  { color: var(--ink); font-weight: 600; }
.tok-str { color: #6e7448; }                    /* 橄榄,沿用 --success 同色 */
.tok-num { color: #b37d3d; font-weight: 600; }  /* 暖棕数字 — 跟纸面协调,跟正文拉开 */
.tok-bool{ color: var(--ink); font-weight: 600; }
.tok-com { color: var(--muted); font-style: italic; }
.tok-fn  { color: var(--text); }
.tok-op  { color: var(--muted); }
.tok-type{ color: #a8473a; }                    /* 深珊瑚,函数返回类型/类名 */
.ai-output blockquote {
  margin: 8px 0;
  padding: 6px 0 6px 12px;
  border-left: 3px solid var(--primary);
  color: rgba(240, 231, 210, 0.74);
  font-style: italic;
  background: linear-gradient(90deg, rgba(217, 95, 77, 0.08), transparent 70%);
}
.ai-output hr {
  border: 0;
  border-top: 1px dashed var(--on-shell-border);
  margin: 12px 0;
}
.ai-output a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.ai-output strong { color: var(--on-shell); font-weight: 600; }
.ai-output em { font-style: italic; }
/* 流式光标:行末珊瑚竖线 1s 步进闪烁,沿用题卡题干左线同色 */
.ai-output .ai-cursor {
  display: inline-block;
  color: var(--primary);
  font-weight: 600;
  margin-left: 1px;
  animation: ai-blink 1s steps(2, start) infinite;
}
@keyframes ai-blink { to { visibility: hidden; } }
@media (prefers-reduced-motion: reduce) {
  .ai-output .ai-cursor { animation: none; }
  .option,
  .btn,
  .feedback.show {
    transition: none;
    animation: none;
  }
  .option:hover:not(.disabled):not(.selected):not(.correct):not(.wrong),
  .btn:hover:not(:disabled) {
    transform: none;
  }
}
.ai-input-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--on-shell-border);
}
.ai-input-row input {
  flex: 1;
  min-width: 0;
  border: 1px dashed var(--on-shell-border);
  border-radius: 8px;
  background: var(--shell-dark-2);
  color: var(--on-shell);
  padding: 8px 12px;
  font: 12.5px/1.4 var(--font-mono);
}
.ai-input-row input::placeholder { color: var(--on-shell-muted); }
.ai-input-row input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
  border-color: var(--primary);
  border-style: solid;
}
/* 询问 AI 按钮:在深色面板里用珊瑚色跳出来,比默认 ink 按钮轻盈 */
.ai-input-row .btn {
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 500;
  border-radius: 8px;
}
.ai-input-row .btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-ink);
  box-shadow: none;
}
.ai-input-row .btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: var(--primary-ink);
}

/* AI 栏底部学习概览 */
.ai-quick {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  padding: 10px 12px;
  background: rgba(240, 231, 210, 0.035);
  border: 1px solid var(--on-shell-border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--on-shell-muted);
  flex-shrink: 0;
}
.ai-quick-progress {
  display: grid;
  gap: 6px;
  min-width: 0;
}
.ai-quick-progress-copy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.ai-quick-progress-copy > span,
.ai-quick-metric > span {
  color: var(--on-shell-muted);
}
.ai-quick-progress-copy strong {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  color: var(--on-shell);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.02em;
}
.ai-quick-progress-copy small {
  color: var(--on-shell-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.04em;
}
.ai-quick-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-left: 1px solid var(--on-shell-border);
  padding-left: 12px;
}
.ai-quick-metric {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  min-width: 0;
  text-align: center;
}
.ai-quick-metric > span {
  white-space: nowrap;
  letter-spacing: 0.03em;
}
.ai-quick-metric + .ai-quick-metric {
  border-left: 1px solid var(--on-shell-border);
  padding-left: 6px;
  margin-left: 6px;
}
.ai-quick-metric strong {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
}
.ai-quick-acc strong { color: var(--success); }
.ai-quick-wrong strong { color: var(--error); }
.ai-quick-bar {
  width: 100%;
  height: 3px;
  background: var(--shell-dark-3);
  border-radius: 999px;
  overflow: hidden;
}
.ai-quick-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-hover));
  transition: width 0.3s ease;
}

/* === Loading / empty === */
.loading, .empty {
  text-align: center;
  padding: 50px 20px;
  color: var(--muted);
  font-size: 14px;
}
.empty .btn { margin-top: 12px; }

/* === Toast === */
.toast {
  position: fixed; top: 24px; left: 50%; transform: translateX(-50%);
  padding: 10px 20px;
  background: var(--text);
  color: var(--bg);
  border-radius: var(--radius);
  font-size: 13px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  z-index: 100;
  letter-spacing: 0.02em;
}
.toast.show { opacity: 1; }

/* === Responsive === */
@media (max-width: 600px) {
  body { padding: 14px 12px 32px; }
  .panel { padding: 16px; }
  #quiz-area.panel { padding: 18px 16px; }
  .app-nav { margin: -6px 0 14px; }
  .placeholder-panel { padding: 18px 16px; }
  .placeholder-head {
    flex-direction: column;
    gap: 10px;
  }
  .placeholder-head h2 { font-size: 28px; }
  .wiki-card-grid { grid-template-columns: 1fr; }
  .header {
    grid-template-columns: 1fr;
    align-items: stretch;
    gap: 14px;
    margin-bottom: 18px;
    padding-bottom: 14px;
  }
  .header h1 { font-size: 22px; }
  .header h1 .brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    font-size: 12px;
  }
  .header h1 .brand-mark::after {
    right: 7px;
    bottom: 7px;
    width: 11px;
  }
  .header-stats {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    letter-spacing: 0.1em;
    justify-self: stretch;
    border-top: 1px dashed var(--border);
    padding-top: 12px;
  }
  .header-stats strong { font-size: 18px; }
  .header-stats > span {
    align-items: flex-start;
    padding: 0 10px;
    border-left: 1px dashed var(--border);
  }
  .header-stats > span:first-child { padding-left: 0; border-left: none; }
  .header-tools {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .auth-user {
    justify-content: stretch;
    width: 100%;
  }
  .header-action-btn {
    flex: 1 1 auto;
    justify-content: center;
  }
  .user-menu {
    left: 0;
    right: 0;
    width: auto;
  }
  .preview-modal { padding: 10px; }
  .preview-head { padding: 15px 16px 12px; }
  .preview-head h2 { font-size: 24px; }
  .preview-body { padding: 12px 14px 16px; }
  .preview-chapter {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .preview-cell {
    width: 26px;
    height: 26px;
  }
  .q-stem { font-size: 15.5px; line-height: 1.78; padding-left: 16px; }
  .option { font-size: 14px; padding: 11px 12px; gap: 10px; }
  .option .opt-letter { width: 24px; height: 24px; font-size: 12px; }
  .controls-row { gap: 6px; align-items: stretch; }
  select { min-width: 0; flex: 1 1 100%; width: 100%; }
  .mode-tabs { width: 100%; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mode-btn { width: 100%; justify-content: center; padding: 9px 10px; }
  .q-meta { flex-direction: column; align-items: flex-start; gap: 6px; }
  .q-meta .q-pos strong { font-size: 19px; }
  .actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .actions .btn { justify-content: center; }
  .action-spacer { margin-left: 0; }
  .action-hint { grid-column: 1 / -1; order: 3; }
  .status-pill { grid-column: 1 / -1; justify-content: center; }
  .backup-row { justify-content: stretch; flex-wrap: wrap; }
  .backup-note { width: 100%; margin-right: 0; }
  .backup-btn { flex: 1; }
  .ai-head { align-items: flex-start; }
  .ai-actions, .ai-input-row { flex-direction: column; }
  .ai-input-row .btn { width: 100%; }
  .ai-cfg-row label { flex-basis: 100%; }
}

/* === Label utility (poster-style small caps) === */
.label {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--text-2);
}
.label::before {
  content: "";
  width: 18px; height: 1.5px;
  background: var(--primary);
}

/* === Nav-bar inline quote (sits in the "题库导航" row, between label and toggle) === */
.nav-quote {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 15px;
  line-height: 1.45;
  color: var(--text-2);
  margin-left: auto;
  margin-right: 22px;
  max-width: 540px;
  padding: 0 16px;
  border-left: 1.5px solid var(--ink);
  border-right: 1.5px solid var(--ink);
  overflow: hidden;
}
.nav-quote .nq-text {
  color: var(--text);
  flex: 1 1 auto;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
}
.nav-quote .nq-author {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-2);
  flex: 0 0 auto;
  white-space: nowrap;
}
.nav-quote .nq-switches {
  display: flex;
  gap: 4px;
  flex: 0 0 auto;
}
.nav-quote .nq-btn {
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1.5px solid var(--ink);
  border-radius: 4px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-style: normal;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.nav-quote .nq-btn:hover {
  background: var(--ink);
  color: #fff;
}
.nav-quote .nq-btn:active {
  transform: scale(0.9);
}
.nav-quote .nq-btn:focus-visible {
  outline: 1.5px solid var(--ink);
  outline-offset: 2px;
}
@media (max-width: 820px) {
  .nav-quote { display: none; }
}
.sidebar .nav-quote { display: none; }

/* === Header inline quote (between brand and stats) === */
.header-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-2);
  justify-self: center;
  text-align: center;
  max-width: 430px;
  min-width: 0;
  padding: 0 12px;
  border-left: 1px solid rgba(217, 95, 77, 0.78);
  border-right: 1px solid rgba(217, 95, 77, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header-quote .hq-text {
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  font-size: 15px;
}
.header-quote .hq-author {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 9.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-2);
  white-space: nowrap;
  flex-shrink: 0;
}
.auth-card {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  padding: 0;
  background: #f2e9d7;
}
.auth-frame {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
  background: transparent;
}
.auth-user {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: flex-end;
  flex-wrap: nowrap;
  font-size: 12px;
  color: var(--text-2);
}
.header-account-tools {
  display: inline-flex;
  align-items: stretch;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel) 78%, transparent);
  box-shadow: var(--shadow-toolbar);
}
.auth-user strong {
  color: var(--text);
}
.header-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  padding: 8px 10px;
  font: 11px/1 var(--font-mono);
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: none;
}
.header-action-btn + .header-action-btn { border-left: 1px solid var(--border); border-radius: 0; }
.header-action-btn:first-child { border-radius: 8px 0 0 8px; }
.header-action-btn:last-child { border-radius: 0 8px 8px 0; }
.header-action-btn svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.header-action-btn i {
  color: var(--muted);
  font-style: normal;
  font-size: 12px;
}
.header-action-btn.is-account {
  color: var(--text);
  background: var(--primary-tint-soft);
}
.header-action-btn.is-account strong { color: var(--primary-hover); }
.header-action-btn:hover {
  color: var(--text);
  background: var(--panel-2);
}
.header-action-btn strong {
  font-family: inherit;
  letter-spacing: 0.02em;
}
.user-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  z-index: 35;
  width: 260px;
  padding: 14px;
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}
.user-menu[hidden] { display: none; }
.user-menu::before {
  content: "";
  position: absolute;
  top: -6px;
  right: 24px;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  background: var(--panel);
  border-left: 1px solid var(--border-strong);
  border-top: 1px solid var(--border-strong);
}
.user-menu-title {
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 5px;
}
.user-menu-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 12px;
}
.user-menu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 10px 0 12px;
}
.user-menu-stat {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 7px 8px;
  color: var(--muted);
  font: 10px/1.2 var(--font-mono);
  text-transform: uppercase;
}
.user-menu-stat strong {
  display: block;
  margin-bottom: 3px;
  font: 18px/1 var(--font-display);
  color: var(--text);
}
.user-menu-actions {
  display: grid;
  gap: 8px;
}
.user-menu-actions .backup-btn {
  width: 100%;
  justify-content: center;
}
.preview-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(31, 29, 24, 0.34);
  backdrop-filter: blur(8px);
}
.preview-modal[hidden] { display: none; }
.preview-box {
  width: min(1040px, 96vw);
  max-height: min(86vh, 860px);
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.preview-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px 14px;
  border-bottom: 1px dashed var(--border);
}
.preview-head h2 {
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.1;
  margin: 0 0 5px;
}
.preview-sub {
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.45;
}
.preview-close {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text-2);
  width: 34px;
  height: 34px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
}
.preview-close:hover { color: var(--text); border-color: var(--border-strong); }
.preview-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  padding: 12px 20px;
  border-bottom: 1px dashed var(--border);
  color: var(--text-2);
  font-size: 12px;
}
.preview-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 20px;
  border-bottom: 1px dashed var(--border);
}
.preview-filter {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(251, 244, 228, 0.58);
  color: var(--text-2);
  padding: 7px 12px;
  font: 11px/1 var(--font-mono);
  letter-spacing: 0.08em;
  cursor: pointer;
}
.preview-filter:hover {
  border-color: var(--border-strong);
  color: var(--text);
}
.preview-filter.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--primary-ink);
}
.preview-dot {
  display: inline-block;
  width: 11px;
  height: 11px;
  border-radius: 3px;
  margin-right: 5px;
  vertical-align: -1px;
  border: 1px solid var(--border-strong);
}
.preview-dot.correct { background: var(--success); }
.preview-dot.wrong { background: var(--error); }
.preview-dot.fav { background: var(--warning); }
.preview-dot.todo { background: rgba(23, 20, 15, 0.08); }
.preview-body {
  padding: 14px 18px 20px;
  overflow: auto;
}
.preview-book {
  margin-bottom: 20px;
}
.preview-book-title {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--text);
}
.preview-book-title small {
  font: 10px/1 var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--muted);
}
.preview-chapter {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px dashed var(--border);
  align-items: start;
}
.preview-chapter-title {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 8px;
  row-gap: 2px;
  align-items: baseline;
  color: var(--text-2);
  line-height: 1.35;
  padding-top: 1px;
}
.preview-chapter-title strong {
  color: var(--text);
  font: 700 13px/1.2 var(--font-mono);
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.preview-chapter-name {
  color: var(--text-2);
  font-size: 12.5px;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.preview-chapter-count {
  grid-column: 2;
  color: var(--muted);
  font: 10px/1.2 var(--font-mono);
  letter-spacing: 0.08em;
}
.preview-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-content: flex-start;
}
.preview-cell {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(23, 20, 15, 0.06);
  color: var(--muted);
  font: 10px/1 var(--font-mono);
  cursor: pointer;
  position: relative;
}
.preview-cell:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-toolbar);
  border-color: var(--border-strong);
}
.preview-cell.correct {
  background: var(--success);
  color: var(--success-light);
  border-color: rgba(48, 53, 28, 0.35);
}
.preview-cell.wrong {
  background: var(--error);
  color: var(--error-light);
  border-color: rgba(84, 35, 29, 0.35);
}
.preview-cell.fav {
  background: var(--warning);
  color: #fff8df;
  border-color: rgba(110, 71, 21, 0.35);
}
.preview-cell.current::after {
  content: "";
  position: absolute;
  inset: -4px;
  border: 2px solid var(--ink);
  border-radius: 10px;
  pointer-events: none;
}
.backup-row {
  justify-content: space-between;
}
.sync-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
@media (max-width: 1100px) {
  .header-quote { display: none; }
}

/* ============== Feature 4: 题号手写体 ============== */
.q-pos .q-pos-handwritten {
  font-family: 'Caveat', 'Ma Shan Zheng', cursive;
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--primary);
  letter-spacing: -0.01em;
  display: inline-block;
  transform: rotate(-2deg);
  text-shadow: 1px 1px 0 rgba(217, 95, 77, 0.08);
  padding: 0 2px;
}
.q-pos .q-pos-num-wrap {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
}
.q-pos .q-pos-handwritten-prefix {
  font-family: 'Caveat', cursive;
  font-weight: 500;
  font-size: 18px;
  color: var(--primary);
  opacity: 0.7;
  transform: rotate(-2deg);
  display: inline-block;
}

/* ============== Feature 5: 真题 / 自编题 标签 ============== */
.q-source-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 2px 7px;
  border-radius: 999px;
  margin-right: 6px;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s;
  border: 1px solid transparent;
}
.q-source-tag.tag-self {
  background: var(--ink-tint);
  color: var(--text-2);
  border-color: var(--border);
}
.q-source-tag.tag-exam {
  background: var(--error-tint);
  color: var(--error-ink);
  border-color: rgba(166, 75, 63, 0.3);
}
.q-source-tag.tag-mock {
  background: var(--primary-tint-soft);
  color: var(--primary-hover);
  border-color: rgba(184, 111, 75, 0.35);
}
.q-source-tag.tag-unknown {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
  border-style: dashed;
}
.q-source-tag:hover {
  transform: translateY(-1px);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

/* ============== Feature 6: 全文搜索 ============== */
.search-trigger {
  margin-top: 8px;
  display: flex; align-items: center; gap: 8px;
  cursor: pointer;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.12);
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-size: 11px;
  color: var(--muted);
  transition: all 0.15s;
  width: 100%;
  text-align: left;
  min-height: 38px;
  overflow: hidden;
}
.search-trigger:hover { border-color: var(--primary); color: var(--text); }
.search-trigger-icon { width: 13px; height: 13px; flex: 0 0 13px; }
.search-trigger-text { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.search-trigger-kbd {
  font-family: var(--font-mono);
  font-size: 9px;
  padding: 2px 5px;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--muted);
  background: var(--ink-tint);
  flex: 0 0 auto;
}
.sidebar-utility {
  border-top: 1px dashed var(--border);
  margin-top: 6px;
  padding-top: 8px;
}
.sidebar-utility .search-trigger { margin-top: 0; }
.search-modal {
  position: fixed; inset: 0;
  background: rgba(23, 20, 15, 0.5);
  z-index: 200;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 80px 16px 16px;
  backdrop-filter: blur(2px);
}
.search-modal[hidden] { display: none; }
.search-box {
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  width: 100%;
  max-width: 640px;
  max-height: 75vh;
  display: flex; flex-direction: column;
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
  overflow: hidden;
}
.search-input-row {
  display: flex; align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  gap: 10px;
}
.search-input-row svg { width: 16px; height: 16px; color: var(--muted); flex-shrink: 0; }
.search-input {
  flex: 1; border: none; background: transparent;
  font-size: 15px;
  font-family: 'Inter Tight', system-ui, sans-serif;
  color: var(--text);
  outline: none;
  padding: 4px 0;
}
.search-input::placeholder { color: var(--muted); }
.search-hint {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted);
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 3px;
  white-space: nowrap;
}
.search-close {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.search-close:hover { border-color: var(--border-strong); color: var(--text); background: var(--ink-tint); }
.search-close:focus-visible,
.search-source-filter:focus-visible,
.search-year-filter:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.search-filter-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border-bottom: 1px dashed var(--border);
  background: var(--panel-toolbar);
}
.search-source-filters {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.search-source-filter,
.search-year-filter {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.18);
  color: var(--text-2);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}
.search-source-filter {
  cursor: pointer;
  padding: 4px 9px;
  transition: all 0.15s;
}
.search-source-filter:hover,
.search-source-filter.is-active {
  border-color: var(--primary);
  color: var(--primary-hover);
  background: var(--primary-tint-soft);
}
.search-year-label {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.08em;
}
.search-year-filter {
  padding: 4px 8px;
  outline: none;
}
.search-year-filter:disabled {
  color: var(--muted);
  opacity: 0.65;
}
.search-results {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}
.search-result {
  padding: 10px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--border-soft);
  transition: background 0.1s;
}
.search-result:hover, .search-result.is-active {
  background: var(--primary-tint-soft);
}
.search-result[aria-selected="true"] { background: var(--primary-tint-soft); }
.search-result.is-active { border-left: 2px solid var(--primary); padding-left: 14px; }
.search-result-meta {
  font-size: 10px;
  color: var(--muted);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  margin-bottom: 4px;
  display: flex; gap: 6px; align-items: center;
}
.search-result-stem {
  font-size: 12px;
  color: var(--text);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-family: 'Inter Tight', system-ui, sans-serif;
}
.search-result-stem mark {
  background: var(--primary-tint);
  color: var(--primary-ink);
  padding: 0 2px;
  border-radius: 2px;
}
.search-empty {
  padding: 32px 16px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  font-family: 'Inter Tight', system-ui, sans-serif;
  line-height: 1.6;
}
.search-footer {
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--muted);
  display: flex; gap: 12px;
  letter-spacing: 0.08em;
}
.search-footer span { display: inline-flex; gap: 4px; align-items: center; }
.search-footer .search-total { margin-left: auto; }
.search-footer kbd {
  font-family: var(--font-mono);
  background: var(--ink-tint);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 9px;
}

/* ============== Feature 2: AI 对话历史 ============== */
.ai-history {
  border-top: 1px dashed var(--border);
  padding-top: 8px;
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
}
.ai-history[hidden] { display: none; }
.ai-history-head {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2px;
  padding: 0 2px;
}
.ai-history-clear {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--muted);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
}
.ai-history-clear:hover { color: var(--error); }
.ai-history-msg {
  font-size: 11px;
  line-height: 1.5;
  padding: 6px 8px;
  border-radius: 4px;
  font-family: 'Inter Tight', system-ui, sans-serif;
  word-break: break-word;
}
.ai-history-msg.user {
  background: var(--primary-tint-soft);
  color: var(--text);
  border-left: 2px solid var(--primary);
}
.ai-history-msg.assistant {
  background: var(--ink-tint);
  color: var(--text-2);
  border-left: 2px solid var(--accent-blue);
}
.ai-history-msg .ai-history-q {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--muted);
  margin-bottom: 2px;
  letter-spacing: 0.06em;
}
.ai-history-empty {
  font-size: 10px;
  color: var(--muted);
  text-align: center;
  padding: 6px;
  font-family: 'Inter Tight', system-ui, sans-serif;
}
.ai-shell .ai-history {
  border-top-color: var(--on-shell-border);
  scrollbar-width: thin;
  scrollbar-color: rgba(240, 231, 210, 0.28) transparent;
}
.ai-shell .ai-history::-webkit-scrollbar { width: 6px; }
.ai-shell .ai-history::-webkit-scrollbar-track { background: transparent; }
.ai-shell .ai-history::-webkit-scrollbar-thumb {
  background: rgba(240, 231, 210, 0.24);
  border-radius: 999px;
}
.ai-shell .ai-history-head,
.ai-shell .ai-history-clear,
.ai-shell .ai-history-msg .ai-history-q,
.ai-shell .ai-history-empty {
  color: var(--on-shell-muted);
}
.ai-shell .ai-history-clear:hover { color: var(--primary); }
.ai-shell .ai-history-msg {
  color: rgba(240, 231, 210, 0.86);
  border-radius: 8px;
  padding: 8px 10px;
}
.ai-shell .ai-history-msg.user {
  background: rgba(217, 95, 77, 0.13);
  color: rgba(240, 231, 210, 0.90);
  border-left-color: var(--primary);
}
.ai-shell .ai-history-msg.assistant {
  background: rgba(82, 111, 134, 0.14);
  color: rgba(240, 231, 210, 0.88);
  border-left-color: var(--accent-blue);
}

.q-stem-wrap { position: relative; }
.q-stem-wrap .q-stem-inner { display: block; }

@media (max-width: 900px) {
  .q-meta {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }
  .q-meta .q-source {
    min-width: 0;
    white-space: nowrap;
  }
  .q-pos .q-pos-handwritten { font-size: 24px; }
}

@media (max-width: 600px) {
  .weak-panel > summary { padding: 7px 8px; }
  .weak-head { align-items: center; }
  .weak-head-label { font-size: 9.5px; letter-spacing: 0.1em; }
  .search-trigger-kbd { display: none; }
  .q-meta {
    grid-template-columns: 1fr auto;
    gap: 8px 10px;
  }
  .q-meta .q-pos {
    grid-column: 1 / -1;
  }
  .q-meta .q-source {
    width: 100%;
    white-space: normal;
    line-height: 1.45;
  }
  .q-source-tag {
    margin-bottom: 3px;
  }
  .q-pos .q-pos-handwritten { font-size: 22px; }
  .search-modal { padding-top: 42px; }
}

/* ============== Learning dashboard ============== */
.dashboard-view {
  max-width: 1240px;
  margin: 22px auto 52px;
  padding: 0 20px;
}
.dashboard-shell {
  padding: 24px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--primary) 6%, transparent) 1px, transparent 1px) 0 0 / 36px 36px,
    var(--panel);
}
.dashboard-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.dashboard-head h2 {
  margin: 4px 0 6px;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(30px, 4vw, 46px);
  color: var(--ink);
  letter-spacing: -0.04em;
}
.dashboard-head p:not(.dashboard-kicker) { margin: 0; color: var(--muted); }
.dashboard-kicker,
.dashboard-card-head span {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.dashboard-content { margin-top: 22px; }
.dashboard-summary-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}
.dashboard-summary-grid article,
.dashboard-card {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 92%, white);
  box-shadow: 0 7px 18px rgba(68, 49, 31, 0.06);
}
.dashboard-summary-grid article {
  min-height: 132px;
  padding: 17px;
  border-top: 3px solid var(--primary);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.dashboard-summary-grid article:nth-child(even) { border-top-color: var(--success); }
.dashboard-summary-grid span { color: var(--muted); font-size: 12px; font-weight: 700; }
.dashboard-summary-grid strong {
  font-family: Georgia, serif;
  font-size: 38px;
  line-height: 1;
  color: var(--ink);
}
.dashboard-summary-grid small { color: var(--muted); font-size: 11px; line-height: 1.45; }
.dashboard-main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  gap: 16px;
  margin-top: 16px;
}
.dashboard-card { padding: 20px; margin-top: 16px; }
.dashboard-main-grid .dashboard-card { margin-top: 0; }
.dashboard-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}
.dashboard-card-head h3 { margin: 4px 0 0; font-family: Georgia, "Noto Serif SC", serif; font-size: 23px; color: var(--ink); }
.dashboard-card-head small { max-width: 320px; color: var(--muted); text-align: right; line-height: 1.5; }
.dashboard-activity {
  display: grid;
  grid-template-columns: repeat(14, minmax(18px, 1fr));
  gap: 8px;
  align-items: end;
  min-height: 176px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}
.dashboard-day { min-width: 0; text-align: center; }
.dashboard-day-bar {
  height: 132px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 3px;
  border-bottom: 1px solid var(--border);
}
.dashboard-day-bar i {
  width: 100%;
  min-height: 4px;
  display: block;
  background: linear-gradient(180deg, var(--primary), color-mix(in srgb, var(--primary) 58%, var(--paper)));
  border-radius: 4px 4px 0 0;
  transition: height 220ms ease;
}
.dashboard-day:nth-child(3n) .dashboard-day-bar i { background: linear-gradient(180deg, var(--success), color-mix(in srgb, var(--success) 58%, var(--paper))); }
.dashboard-day span { display: block; margin-top: 7px; color: var(--muted); font-size: 9px; writing-mode: vertical-rl; }
.dashboard-priority-list { display: grid; gap: 8px; }
.dashboard-priority-list button {
  width: 100%;
  display: grid;
  grid-template-columns: 38px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 13px 12px;
  border: 1px solid var(--border);
  background: var(--paper);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}
.dashboard-priority-list button:hover,
.dashboard-priority-list button:focus-visible { border-color: var(--primary); transform: translateX(3px); }
.dashboard-priority-list button > b { font-family: Georgia, serif; color: var(--primary); font-size: 22px; }
.dashboard-priority-list button span { display: grid; gap: 4px; }
.dashboard-priority-list button strong { font-size: 13px; }
.dashboard-priority-list button small { color: var(--muted); }
.dashboard-priority-list button > i { min-width: 42px; color: var(--success); font-family: Georgia, serif; font-size: 19px; text-align: right; }
.dashboard-empty { color: var(--muted); padding: 28px 12px; text-align: center; }
.dashboard-subject-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.dashboard-subject-grid article { padding: 15px; border: 1px solid var(--border); background: var(--paper); }
.dashboard-subject-title,
.dashboard-metric-line,
.dashboard-subject-stats { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.dashboard-subject-title strong { font-size: 14px; }
.dashboard-metric-line { margin-top: 17px; color: var(--muted); font-size: 12px; }
.dashboard-progress,
.dashboard-cell-progress { height: 6px; overflow: hidden; border-radius: 999px; background: color-mix(in srgb, var(--border) 65%, transparent); }
.dashboard-progress { margin: 7px 0 14px; }
.dashboard-progress i,
.dashboard-cell-progress i { height: 100%; display: block; background: var(--primary); }
.dashboard-subject-stats { align-items: flex-start; color: var(--muted); font-size: 10px; }
.dashboard-subject-stats span { display: grid; gap: 3px; }
.dashboard-subject-stats b { color: var(--ink); font-size: 14px; }
.dashboard-trend { white-space: nowrap; font-size: 10px; font-weight: 800; }
.dashboard-trend.is-up { color: #557047; }
.dashboard-trend.is-down { color: var(--error); }
.dashboard-trend.is-neutral { color: var(--muted); }
.dashboard-table-wrap { overflow: auto; }
.dashboard-table { width: 100%; min-width: 850px; border-collapse: collapse; }
.dashboard-table th {
  padding: 9px 10px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-align: left;
}
.dashboard-table td { padding: 12px 10px; border-bottom: 1px dashed var(--border); color: var(--ink); font-size: 12px; }
.dashboard-table td:first-child { min-width: 220px; }
.dashboard-table td:first-child strong,
.dashboard-table td:first-child span { display: block; }
.dashboard-table td:first-child span { margin-top: 3px; color: var(--muted); font-size: 11px; }
.dashboard-table td:nth-child(2) { min-width: 130px; }
.dashboard-cell-progress { width: 76px; display: inline-block; margin-right: 7px; vertical-align: middle; }
.dashboard-table button {
  border: 1px solid var(--primary);
  background: transparent;
  color: var(--primary);
  padding: 5px 10px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.dashboard-table button:hover { background: var(--primary); color: white; }
.dashboard-onboarding {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 30px;
  border-left: 4px solid var(--primary);
}
.dashboard-onboarding h3 {
  margin: 7px 0 8px;
  color: var(--ink);
  font: 28px/1.25 Georgia, "Noto Serif SC", serif;
}
.dashboard-onboarding p { max-width: 700px; color: var(--text-2); }
.dashboard-chapter-head { align-items: center; }
.dashboard-chapter-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}
.dashboard-filter-group {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-toolbar);
}
.dashboard-filter-group button {
  min-height: 30px;
  padding: 5px 10px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--text-2);
  font-family: inherit;
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}
.dashboard-filter-group button[aria-pressed="true"] { background: var(--primary); color: var(--primary-ink); }
.dashboard-filter-group button:focus-visible,
.dashboard-sort-label select:focus-visible,
.dashboard-table-footer button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.dashboard-sort-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font: 700 10px/1 var(--font-mono);
  letter-spacing: 0.06em;
}
.dashboard-sort-label select {
  min-height: 36px;
  padding: 5px 28px 5px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--paper);
  color: var(--text);
  font-family: inherit;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.2;
}
.dashboard-table-empty {
  height: 96px;
  color: var(--muted) !important;
  text-align: center;
}
.dashboard-table-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  color: var(--muted);
  font: 600 11px/1.3 var(--font-mono);
}
.dashboard-table-footer button {
  border: 0;
  border-bottom: 1px solid var(--primary);
  background: transparent;
  color: var(--primary-hover);
  padding: 4px 0;
  font-family: inherit;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
}

@media (max-width: 980px) {
  .dashboard-summary-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .dashboard-main-grid { grid-template-columns: 1fr; }
  .dashboard-subject-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .dashboard-view { padding: 0 10px; margin-top: 12px; }
  .dashboard-shell { padding: 16px; }
  .dashboard-head { display: grid; }
  .dashboard-head .btn { width: 100%; }
  .dashboard-summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dashboard-summary-grid article { min-height: 116px; }
  .dashboard-subject-grid { grid-template-columns: 1fr; }
  .dashboard-card-head { display: grid; }
  .dashboard-card-head small { text-align: left; }
  .dashboard-activity { gap: 4px; overflow-x: auto; }
}

/* ============== Account password ============== */
.password-modal {
  position: fixed;
  inset: 0;
  z-index: 210;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(31, 29, 24, 0.42);
  backdrop-filter: blur(8px);
}
.password-modal[hidden] { display: none; }
.password-box {
  width: min(470px, 96vw);
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.password-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px 18px;
  border-bottom: 1px dashed var(--border);
}
.password-head h2 {
  margin: 5px 0 7px;
  font: 30px/1.05 var(--font-display);
}
.password-head p {
  margin: 0;
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.5;
}
.password-fields {
  display: grid;
  gap: 14px;
  padding: 20px 24px;
}
.password-fields label {
  display: grid;
  gap: 7px;
  color: var(--text-2);
  font-size: 12px;
  font-weight: 600;
}
.password-fields input {
  width: 100%;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  padding: 11px 12px;
  font: 14px/1.2 var(--font-sans);
  outline: none;
}
.password-fields input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-tint);
}
.password-message {
  min-height: 18px;
  margin: 0;
  color: var(--error);
  font-size: 12px;
}
.password-actions {
  display: flex;
  justify-content: flex-end;
  gap: 9px;
  padding: 0 24px 22px;
}
@media (max-width: 560px) {
  .password-modal { padding: 12px; align-items: end; }
  .password-box { width: 100%; }
  .password-head, .password-fields { padding-left: 18px; padding-right: 18px; }
  .password-actions { padding-left: 18px; padding-right: 18px; }
}

/* ============== Dashboard review rules ============== */
.dashboard-title-row {
  position: relative;
  display: flex;
  align-items: center;
  width: fit-content;
  gap: 10px;
}
.dashboard-help-button {
  display: grid;
  place-items: center;
  width: 25px;
  height: 25px;
  margin-top: 5px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--primary);
  font: 700 14px/1 var(--font-mono);
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s, transform 0.15s;
}
.dashboard-help-button:hover,
.dashboard-help-button[aria-expanded="true"] {
  border-color: var(--primary);
  background: var(--primary-tint-soft);
  transform: translateY(-1px);
}
.dashboard-help-popover {
  position: absolute;
  z-index: 80;
  top: calc(100% + 9px);
  left: min(280px, 55%);
  width: min(390px, calc(100vw - 40px));
  padding: 16px 18px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow-md);
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.55;
}
.dashboard-help-popover[hidden] { display: none; }
.dashboard-help-popover::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 20px;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  background: var(--panel);
  border-left: 1px solid var(--border-strong);
  border-top: 1px solid var(--border-strong);
}
.dashboard-help-popover strong {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font: 18px/1.2 var(--font-display);
}
.dashboard-help-popover ul {
  margin: 0;
  padding-left: 18px;
}
.dashboard-help-popover li + li { margin-top: 5px; }
@media (max-width: 640px) {
  .dashboard-title-row { width: 100%; }
  .dashboard-help-popover {
    left: 0;
    top: calc(100% + 8px);
    width: 100%;
  }
}

/* Desktop quiz workspace: keep the taller AI rail from extending the page
   beyond the question column and leaving an empty center strip. */
@media (min-width: 1025px) {
  .ai-rail {
    height: var(--ai-rail-height, auto);
    max-height: calc(100vh - 32px);
  }

  .ai-shell {
    height: 100%;
    max-height: 100%;
  }

  .ai-body {
    min-height: 0;
    overflow: hidden;
  }

  .ai-output-area {
    min-height: 140px;
    max-height: none;
  }
}

@media (max-width: 420px) {
  .ai-quick {
    grid-template-columns: 1fr;
  }

  .ai-quick-metrics {
    border-left: 0;
    border-top: 1px solid var(--on-shell-border);
    padding: 8px 0 0;
  }
}