/* =========================================================================
   Kongming Codex · styles.css
   Design language: "Ink & Vermillion" — editorial serif headings, warm paper
   surfaces, seal-red accents, hairline rules. Light + dark via CSS tokens.
   ========================================================================= */

/* ---------- tokens ---------- */
:root, [data-theme="light"] {
  --bg: #f6f1e6;
  --surface: #fffdf6;
  --surface-2: #f0e9d8;
  --line: #e0d6c0;
  --line-strong: #c8bb9f;
  --ink: #262019;
  --ink-2: #5d5344;
  --ink-3: #8b7f6a;
  --primary: #b3391e;
  --on-primary: #fffaf5;
  --primary-soft: #f5e2da;
  --accent: #38684f;
  --accent-soft: #e0ebe2;
  --gold: #96742b;
  --danger: #a02c2c;
  --ok: #2f6d4f;
  --serif: "Fraunces", "Noto Serif TC", "Songti TC", serif;
  --sans: "Inter", "Noto Sans TC", "PingFang TC", sans-serif;
  --radius: 10px;
  --radius-lg: 18px;
  --shadow: 0 1px 2px rgba(38, 32, 25, .06), 0 6px 20px -12px rgba(38, 32, 25, .18);
  --shadow-lift: 0 2px 4px rgba(38, 32, 25, .07), 0 14px 34px -16px rgba(38, 32, 25, .28);
}
[data-theme="dark"] {
  --bg: #14121a;
  --surface: #1d1a24;
  --surface-2: #262230;
  --line: #37323f;
  --line-strong: #4c4559;
  --ink: #eae3d2;
  --ink-2: #b5ac99;
  --ink-3: #837a68;
  --primary: #f0684a;
  --on-primary: #2b0e06;
  --primary-soft: #3c231c;
  --accent: #71b493;
  --accent-soft: #21332a;
  --gold: #cba95a;
  --danger: #e07575;
  --ok: #7cc7a1;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 20px -12px rgba(0, 0, 0, .55);
  --shadow-lift: 0 2px 4px rgba(0, 0, 0, .35), 0 14px 34px -16px rgba(0, 0, 0, .7);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--serif); line-height: 1.25; color: var(--ink); }
a { color: var(--primary); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
button { font-family: inherit; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--primary); color: var(--on-primary);
  padding: 8px 16px; border-radius: 0 0 var(--radius) 0; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- app bar ---------- */
.appbar {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.appbar__inner {
  max-width: 1120px; margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); min-width: 0; }
.brand__seal {
  flex: none; width: 34px; height: 34px; border-radius: 8px;
  background: var(--primary); color: var(--on-primary);
  font-family: var(--serif); font-weight: 700; font-size: 19px;
  display: grid; place-items: center;
  box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--on-primary) 35%, transparent);
}
.brand__name {
  font-family: var(--serif); font-weight: 600; font-size: 1.05rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.appbar__actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  display: inline-flex; align-items: center; gap: 4px;
  background: transparent; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 10px; cursor: pointer; font-size: .85rem; line-height: 1;
  transition: border-color .15s, color .15s, background .15s;
}
.icon-btn:hover { border-color: var(--line-strong); color: var(--ink); background: var(--surface); }
.icon-btn .material-symbols-rounded { font-size: 19px; }
.icon-btn__txt { font-weight: 600; letter-spacing: .02em; }
.gh-star {
  display: inline-flex; align-items: center; gap: 5px; text-decoration: none;
  color: var(--ink-2); border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 12px; font-size: .85rem; line-height: 1;
  transition: border-color .15s, color .15s, background .15s;
}
.gh-star:hover { border-color: var(--gold); color: var(--ink); background: var(--surface); }
.gh-star .material-symbols-rounded { font-size: 18px; color: var(--gold); }
.gh-star__count { font-weight: 600; font-variant-numeric: tabular-nums; }

/* ---------- cross-page nav ---------- */
.pagenav { border-bottom: 1px solid var(--line); background: var(--bg); }
.pagenav__inner {
  max-width: 1120px; margin: 0 auto; padding: 10px 20px;
  display: flex; gap: 8px; overflow-x: auto; scrollbar-width: none;
}
.pagenav__inner::-webkit-scrollbar { display: none; }
.navpill {
  flex: none; display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: 999px; text-decoration: none;
  color: var(--ink-2); font-size: .87rem; border: 1px solid transparent;
  transition: color .15s, background .15s, border-color .15s;
}
.navpill .material-symbols-rounded { font-size: 18px; }
.navpill:hover { color: var(--ink); background: var(--surface); border-color: var(--line); }
.navpill--active { color: var(--primary); background: var(--primary-soft); border-color: transparent; font-weight: 600; }

/* ---------- page scaffold ---------- */
#page {
  max-width: 1120px; margin: 0 auto; padding: 40px 20px 72px;
  min-height: 55vh;
}
.page-head { margin: 8px 0 30px; max-width: 820px; }
.page-head h1 {
  margin: 0 0 10px; font-size: clamp(1.9rem, 4.5vw, 2.7rem); font-weight: 600;
  letter-spacing: -.01em;
}
.page-head h1::after {
  content: ""; display: block; width: 58px; height: 3px; margin-top: 16px;
  background: var(--primary); border-radius: 2px;
}
.page-head__sub { margin: 14px 0 0; color: var(--ink-2); font-size: 1.05rem; max-width: 64ch; }
.page-lead { color: var(--ink-2); max-width: 76ch; margin: 0 0 18px; }
.empty { color: var(--ink-3); text-align: center; padding: 48px 0; }

/* ---------- hub / hero ---------- */
.hero__stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px; margin: 26px 0 8px;
}
.hero__stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 18px 20px; display: flex; flex-direction: column; gap: 2px;
}
.hero__stat-value {
  font-family: var(--serif); font-size: 2rem; font-weight: 700; color: var(--primary);
  font-variant-numeric: tabular-nums;
}
.hero__stat-label { color: var(--ink-2); font-size: .85rem; }
.hero__quote {
  margin: 30px 0 34px; padding: 22px 26px;
  border-left: 3px solid var(--primary);
  background: var(--surface); border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}
.hero__quote p {
  margin: 0; font-family: var(--serif); font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  font-weight: 600; line-height: 1.5;
}
.hero__quote cite { display: block; margin-top: 10px; color: var(--ink-3); font-style: normal; font-size: .85rem; }

/* ---------- cards ---------- */
.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px; margin-top: 22px;
}
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 22px; cursor: pointer; display: flex; flex-direction: column; gap: 8px;
  text-decoration: none; color: var(--ink);
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.card:hover, .card:focus-visible {
  transform: translateY(-3px); box-shadow: var(--shadow-lift); border-color: var(--line-strong);
}
.card__icon { font-size: 26px; color: var(--primary); }
.card__meta {
  font-size: .74rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--gold); font-weight: 600;
}
.card__title { margin: 0; font-size: 1.16rem; font-weight: 600; }
.card__summary { margin: 0; color: var(--ink-2); font-size: .92rem; }
.card__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; padding-top: 8px; }
.tag {
  font-size: .74rem; color: var(--accent); background: var(--accent-soft);
  border-radius: 999px; padding: 3px 10px;
}

/* ---------- toolbar / search / chips ---------- */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 20px 0 6px; }
.search {
  flex: 1 1 240px; max-width: 400px;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 10px 18px; font-size: .95rem; font-family: inherit;
}
.search:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: transparent; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  background: transparent; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; font-size: .84rem; cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.chip:hover { border-color: var(--line-strong); color: var(--ink); }
.chip--active { background: var(--ink); color: var(--bg); border-color: var(--ink); font-weight: 600; }
[data-theme="dark"] .chip--active { background: var(--ink); color: var(--bg); }
.result-count { color: var(--ink-3); font-size: .84rem; margin: 10px 2px; }

/* ---------- article ---------- */
.reading-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--primary); z-index: 60;
}
.article-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 40px; }
.article-layout > * { min-width: 0; }
@media (max-width: 900px) { .article-layout { grid-template-columns: 1fr; } .toc { display: none; } }
.toc { position: relative; }
.toc__inner {
  position: sticky; top: 130px; display: flex; flex-direction: column; gap: 2px;
  border-left: 1px solid var(--line); padding-left: 4px;
}
.toc-link {
  color: var(--ink-3); text-decoration: none; font-size: .85rem;
  padding: 5px 12px; border-left: 2px solid transparent; margin-left: -5px;
  transition: color .15s, border-color .15s;
}
.toc-link:hover { color: var(--ink); }
.toc-link--active { color: var(--primary); border-left-color: var(--primary); font-weight: 600; }
.article-body { max-width: 74ch; min-width: 0; }
.article-section { margin-bottom: 40px; min-width: 0; }
.table-wrap { max-width: 100%; }
.prose h2 {
  font-size: 1.55rem; font-weight: 600; margin: 0 0 16px;
  padding-bottom: 10px; border-bottom: 1px solid var(--line);
}
.prose h3 { font-size: 1.14rem; margin: 26px 0 8px; color: var(--primary); }
.prose p { margin: 0 0 14px; color: var(--ink); }
.prose ul { margin: 0 0 14px; padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.prose blockquote {
  margin: 20px 0; padding: 16px 22px;
  border-left: 3px solid var(--gold); background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--serif); font-size: 1.05rem;
}
.prose pre {
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 18px; overflow-x: auto; font-size: .88rem;
}
.callout {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius); padding: 14px 18px; margin: 18px 0;
  font-size: .93rem; color: var(--ink);
}
.callout__icon { color: var(--accent); font-size: 21px; flex: none; margin-top: 2px; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); margin-top: 16px; }
.table-wrap--prose { margin: 18px 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.data-table th {
  text-align: left; padding: 12px 16px; white-space: nowrap;
  font-family: var(--serif); font-weight: 600; font-size: .88rem;
  border-bottom: 2px solid var(--line-strong); color: var(--ink);
  background: var(--surface-2);
}
.data-table td { padding: 11px 16px; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--ink-2); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: color-mix(in srgb, var(--surface-2) 55%, transparent); }
.th-sort { cursor: pointer; user-select: none; }
.th-sort:hover { color: var(--primary); }
.row-link { word-break: break-all; }

.badge {
  display: inline-block; padding: 3px 12px; border-radius: 999px;
  font-size: .78rem; font-weight: 600; white-space: nowrap;
  background: var(--surface-2); color: var(--ink-2); border: 1px solid var(--line);
}
.badge--confirmed { background: var(--accent-soft); color: var(--ok); border-color: transparent; }
.badge--partly-correct { background: color-mix(in srgb, var(--gold) 16%, transparent); color: var(--gold); border-color: transparent; }
.badge--unverifiable { background: var(--primary-soft); color: var(--danger); border-color: transparent; }

/* ---------- stat cards (verification tiles) ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 18px 0; }
.stat-grid--tight { margin: 6px 0 14px; }
.stat-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 16px 18px; display: flex; flex-direction: column; gap: 2px;
}
.stat-card .stat-value { font-family: var(--serif); font-size: 1.7rem; font-weight: 700; color: var(--ink); }
.stat-card--ok .stat-value { color: var(--ok); }
.stat-card--warn .stat-value { color: var(--gold); }
.stat-card--bad .stat-value { color: var(--danger); }
.stat-card .stat-label { color: var(--ink-2); font-size: .83rem; }

/* ---------- detail list (gallery dialog) ---------- */
.dialog__meta {
  margin: -6px 0 12px; font-size: .78rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--gold); font-weight: 600;
}
.detail-list { margin: 18px 0 0; border-top: 1px solid var(--line); }
.detail-row { display: grid; grid-template-columns: 128px minmax(0, 1fr); gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.detail-row dt { font-weight: 600; font-size: .85rem; color: var(--ink-3); }
.detail-row dd { margin: 0; font-size: .92rem; color: var(--ink); }
@media (max-width: 480px) { .detail-row { grid-template-columns: 1fr; gap: 2px; } }

/* ---------- dialog ---------- */
.dialog {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--surface); color: var(--ink);
  max-width: min(680px, calc(100vw - 32px)); width: 100%;
  padding: 0; box-shadow: var(--shadow-lift);
}
.dialog::backdrop { background: rgba(20, 16, 12, .5); backdrop-filter: blur(3px); }
.dialog__bar { display: flex; align-items: center; padding: 12px 14px 0; }
.dialog__spacer { flex: 1; }
.dialog__body { padding: 4px 28px 28px; max-height: 72vh; overflow-y: auto; }
.dialog__body h2 { font-size: 1.5rem; margin: 0 0 10px; }
.dialog__body p { color: var(--ink-2); }

/* ---------- accordion (glossary) ---------- */
.accordion { margin-top: 18px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); overflow: hidden; }
.acc-item { border-bottom: 1px solid var(--line); }
.acc-item:last-child { border-bottom: none; }
.acc-q {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 15px 20px; cursor: pointer; list-style: none;
  font-weight: 600; font-size: .96rem;
}
.acc-q::-webkit-details-marker { display: none; }
.acc-q:hover { color: var(--primary); }
.acc-chevron { transition: transform .2s; color: var(--ink-3); }
.acc-item[open] .acc-chevron { transform: rotate(180deg); }
.acc-item[open] .acc-q { color: var(--primary); }
.acc-a { padding: 0 20px 16px; color: var(--ink-2); font-size: .92rem; max-width: 76ch; }

/* ---------- segmented control ---------- */
.seg { display: inline-flex; flex-wrap: wrap; gap: 6px; padding: 5px; background: var(--surface-2); border-radius: 999px; margin: 4px 0 10px; }
.seg__btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: none; background: transparent; color: var(--ink-2);
  padding: 8px 16px; border-radius: 999px; font-size: .88rem; cursor: pointer;
  transition: background .15s, color .15s;
}
.seg__btn .material-symbols-rounded { font-size: 18px; }
.seg__btn:hover { color: var(--ink); }
.seg__btn--active { background: var(--surface); color: var(--primary); font-weight: 600; box-shadow: var(--shadow); }

/* ---------- arcade ---------- */
.arcade { margin-top: 14px; }
.arcade-panel {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 28px; max-width: 760px;
}
.arcade-panel--center { text-align: center; margin: 0 auto; }
.arcade-progress { color: var(--ink-3); font-size: .85rem; margin: 0 0 14px; font-variant-numeric: tabular-nums; }
.arcade-q { margin: 0 0 18px; font-size: 1.3rem; font-weight: 600; }
.arcade-final { font-size: 1.3rem; font-family: var(--serif); margin: 8px 0 18px; }
.arcade-note { color: var(--ink-3); font-size: .82rem; margin: 12px 0; }
.arcade-row { display: flex; justify-content: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary); color: var(--on-primary);
  border: 1px solid transparent; border-radius: 999px;
  padding: 10px 22px; font-size: .92rem; font-weight: 600; cursor: pointer;
  transition: filter .15s, transform .12s;
}
.btn:hover { filter: brightness(1.06); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--ink-2); border-color: var(--line); }
.btn--ghost:hover { color: var(--ink); border-color: var(--line-strong); }

.quiz-opts { display: grid; gap: 10px; }
.quiz-opt {
  text-align: left; background: var(--bg); color: var(--ink);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 13px 18px; font-size: .95rem; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--primary); }
.quiz-opt:disabled { cursor: default; opacity: .82; }
.quiz-opt--right { border-color: var(--ok); background: var(--accent-soft); color: var(--ink); opacity: 1 !important; font-weight: 600; }
.quiz-opt--wrong { border-color: var(--danger); background: var(--primary-soft); }
.quiz-explain {
  margin: 16px 0 6px; padding: 13px 18px; border-radius: var(--radius);
  background: var(--surface-2); font-size: .9rem; color: var(--ink-2);
}
.quiz-explain[hidden] { display: none; }
#quizNext { margin-top: 12px; }

.flashcard {
  position: relative; width: min(460px, 100%); height: 240px; margin: 6px auto;
  background: transparent; border: none; cursor: pointer; perspective: 1100px; padding: 0;
}
.flashcard__face {
  position: absolute; inset: 0; display: grid; place-items: center;
  padding: 26px; border-radius: var(--radius-lg);
  backface-visibility: hidden; transition: transform .5s;
  font-size: 1.08rem; line-height: 1.55;
}
.flashcard__face--front {
  background: var(--surface-2); border: 1px solid var(--line);
  font-family: var(--serif); font-weight: 600; font-size: 1.35rem;
  transform: rotateY(0deg);
}
.flashcard__face--back {
  background: var(--primary); color: var(--on-primary);
  transform: rotateY(180deg); font-size: .95rem; text-align: left;
}
.flashcard--flipped .flashcard__face--front { transform: rotateY(-180deg); }
.flashcard--flipped .flashcard__face--back { transform: rotateY(0deg); }

.match-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
@media (max-width: 640px) { .match-grid { grid-template-columns: repeat(2, 1fr); } }
.match-tile {
  position: relative; min-height: 92px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--surface-2);
  cursor: pointer; padding: 10px; overflow: hidden;
  transition: border-color .15s, background .2s;
}
.match-tile__back {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--serif); font-size: 1.7rem; color: var(--ink-3);
  background: var(--surface-2); transition: opacity .2s;
}
.match-tile__front { display: grid; place-items: center; height: 100%; font-size: .82rem; line-height: 1.4; color: var(--ink); }
.match-tile--open { border-color: var(--primary); background: var(--surface); }
.match-tile--open .match-tile__back { opacity: 0; }
.match-tile--matched { border-color: var(--ok); background: var(--accent-soft); cursor: default; }
.match-tile--matched .match-tile__back { opacity: 0; }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line); padding: 34px 20px 44px;
  text-align: center; color: var(--ink-3); font-size: .85rem;
}
.footer p { margin: 0 0 12px; }
.footer__links { display: flex; justify-content: center; gap: 10px; }
.footer__link { color: var(--ink-3); text-decoration: none; }
.footer__link:hover { color: var(--ink); }

/* ---------- misc layouts kept for engine compatibility ---------- */
.panel, .kb-card, .tile, .lb-row, .tl-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); }