/* ------------------------------------------------------------------ tokens */
:root {
  --paper: #f4f1ea;
  --paper-2: #ece7dc;
  --card: #fffdf9;
  --ink: #17191c;
  --ink-soft: #4b5058;
  --ink-mute: #7b818b;
  --line: #ddd6c8;
  --line-soft: #e9e3d6;
  --accent: #1f5f9e;
  --accent-soft: #e4eefb;
  --accent-ink: #17456f;
  --on-accent: #ffffff;
  --star: #b57d18;
  --zh-rule: #c8b9a0;
  --shadow: 0 1px 2px rgba(35, 30, 20, .05), 0 12px 32px -18px rgba(35, 30, 20, .35);
  --radius: 14px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Songti SC", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

[data-theme="dark"] {
  --paper: #101215;
  --paper-2: #16191d;
  --card: #191d22;
  --ink: #e9e6df;
  --ink-soft: #b3b8c0;
  --ink-mute: #858c96;
  --line: #2b3138;
  --line-soft: #232830;
  --accent: #7fb0e8;
  --accent-soft: #1b2b3d;
  --accent-ink: #a9c9ef;
  --on-accent: #0c1015;
  --star: #d9a94a;
  --zh-rule: #3a4250;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 18px 40px -24px rgba(0, 0, 0, .8);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; color: inherit; }

/* ------------------------------------------------------------------ topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 24px 10px;
}

.brand { display: flex; align-items: center; gap: 14px; min-width: 0; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1;
  padding-bottom: 3px;
}

.brand-text { min-width: 0; }

.brand h1 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-size: 19px;
  font-weight: 650;
  letter-spacing: .01em;
}

.brand-en {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.brand-sub {
  margin: 2px 0 0;
  font-size: 12.5px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

.topbar-actions { display: flex; gap: 8px; flex: none; }

.icon-btn {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}

.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.icon-btn-label { font-size: 15px; font-weight: 650; line-height: 1; }
.icon-btn[aria-pressed="false"] { color: var(--ink-mute); background: transparent; }

/* ----------------------------------------------------------------- filters */
main { max-width: 1180px; margin: 0 auto; padding: 0 24px 64px; }

.filters {
  margin-top: 14px;
  padding: 4px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.filter-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 11px 0;
}

.filter-row + .filter-row { border-top: 1px dashed var(--line-soft); }

.filter-label {
  font-size: 13px;
  font-weight: 650;
  color: var(--ink);
  padding-top: 5px;
  white-space: nowrap;
}

.filter-label span {
  display: block;
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.chips { display: flex; flex-wrap: wrap; gap: 6px; min-width: 0; }

.chip {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.5;
  cursor: pointer;
  transition: background .14s, border-color .14s, color .14s, transform .14s;
}

.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip:active { transform: translateY(1px); }

.chip .n {
  font-size: 11px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

.chip[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

.chip[aria-pressed="true"] .n { color: currentColor; opacity: .62; }

.chip .sub {
  margin-left: 3px;
  font-size: 10.5px;
  letter-spacing: .04em;
  text-transform: uppercase;
  opacity: .62;
}

.chip .sub.s {
  color: var(--star);
  letter-spacing: .5px;
  opacity: 1;
}

.chip[aria-pressed="true"] .sub.s { color: currentColor; opacity: .82; }

.chip[data-empty="true"] { opacity: .38; }

/* ------------------------------------------------------------------- stage */
.stage { margin-top: 22px; }

.stage-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
  min-height: 40px;
}

.stage-info {
  min-width: 0;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 12px;
  font-size: 13px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

.match-count strong { color: var(--ink); font-weight: 650; }
.round-info { font-size: 12.5px; }

.draw-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  border: 0;
  border-radius: 11px;
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: transform .12s, background .15s, opacity .15s;
}

.draw-btn:hover { background: var(--accent); }
.draw-btn:active { transform: translateY(1px); }
.draw-btn:disabled { opacity: .4; cursor: not-allowed; }
.draw-label { font-size: 14px; font-weight: 650; }
.draw-sub {
  font-size: 10.5px;
  letter-spacing: .06em;
  text-transform: uppercase;
  opacity: .7;
}

.draw-btn kbd {
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 5px;
  border-radius: 4px;
  border: 1px solid currentColor;
  opacity: .45;
}

/* -------------------------------------------------------------------- card */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-height: 320px;
}

.card.is-loading { animation: cardIn .34s cubic-bezier(.2, .7, .3, 1); }

@keyframes cardIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.empty {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 6px;
  padding: 72px 24px 80px;
  text-align: center;
  color: var(--ink-mute);
}

.empty-mark {
  font-family: var(--serif);
  font-size: 44px;
  color: var(--line);
  line-height: 1;
  margin-bottom: 6px;
}

.empty h2 { margin: 0; font-size: 16px; font-weight: 650; color: var(--ink-soft); }
.empty p { margin: 0; font-size: 13px; max-width: 46ch; }

/* meta strip */
.card-meta {
  min-width: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(var(--paper-2), var(--card));
  font-size: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-soft);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.badge-comp {
  border-color: transparent;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 650;
}

.badge-q { font-family: var(--mono); font-size: 11.5px; letter-spacing: .02em; }
.badge-num { font-weight: 650; color: var(--ink); }

.stars {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-mute);
  font-size: 11.5px;
}

.stars .s { color: var(--star); letter-spacing: 1px; font-size: 12.5px; }
.stars .lbl { color: var(--ink-soft); font-weight: 600; }

/* bilingual panes */
.panes {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: stretch;
}

.pane {
  padding: 22px 24px 26px;
  min-width: 0;
}

.pane + .pane { border-left: 1px solid var(--line-soft); }

.pane-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 10.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 650;
}

.pane-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}

.pane-body {
  font-family: var(--serif);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
  overflow-wrap: break-word;
}

.pane-zh .pane-body {
  font-size: 17px;
  line-height: 1.95;
  letter-spacing: .01em;
}

.pane-body p { margin: 0 0 .8em; }
.pane-body p:last-child { margin-bottom: 0; }

.q-caption {
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-mute);
  border-left: 2px solid var(--line);
  padding-left: 10px;
  margin-top: -.3em !important;
}

.q-figure {
  margin: 14px 0 4px;
  text-align: center;
}

.q-figure img {
  max-width: 100%;
  max-height: 340px;
  border-radius: 8px;
  border: 1px solid var(--line-soft);
  background: #fff;
  padding: 6px;
  cursor: zoom-in;
  transition: border-color .15s, transform .15s;
}

.q-figure img:hover { border-color: var(--accent); }

[data-theme="dark"] .q-figure img { background: #f7f5f0; }

.q-figure figcaption {
  margin-top: 6px;
  font-family: var(--sans);
  font-size: 11.5px;
  color: var(--ink-mute);
}

.fig-missing {
  display: inline-block;
  margin: 10px 0 2px !important;
  padding: 8px 12px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
}

.fig-missing::before { content: "▢ "; }

.zh-missing {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  background: var(--paper);
}

.zh-missing strong { display: block; color: var(--ink-soft); font-weight: 650; margin-bottom: 2px; }

/* footer of card */
.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 11px 20px;
  border-top: 1px solid var(--line-soft);
  background: var(--paper);
  font-size: 12px;
  color: var(--ink-mute);
}

.source { font-variant-numeric: tabular-nums; }
.source b { color: var(--ink-soft); font-weight: 650; }

.actions { display: flex; gap: 8px; }

.ghost-btn {
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink-soft);
  font-size: 12px;
  cursor: pointer;
  transition: border-color .15s, color .15s;
}

.ghost-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ------------------------------------------------------------------- misc */
body.hide-zh .pane-zh { display: none; }
body.hide-zh .panes { grid-template-columns: 1fr; }

.site-foot {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-mute);
  line-height: 1.7;
}

.site-foot p { margin: 0; max-width: 78ch; }

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 4vmin;
  background: rgba(20, 18, 14, .82);
  cursor: zoom-out;
  backdrop-filter: blur(2px);
}

.lightbox[hidden] { display: none; }
.lightbox img {
  max-width: 100%;
  max-height: 92vh;
  background: #fff;
  border-radius: 10px;
  padding: 10px;
}

/* KaTeX inside question text */
.pane-body .katex { font-size: 1.02em; }

/* --------------------------------------------------------------- responsive */
@media (max-width: 860px) {
  .topbar { padding: 18px 16px 8px; }
  .stage-head { flex-wrap: wrap; gap: 10px; }
  .draw-btn { flex: 1 1 100%; justify-content: center; }
  .stage-info { min-width: 0; }
  main { padding: 0 16px 48px; }
  .brand-en { display: none; }
  .filter-row { grid-template-columns: 1fr; gap: 6px; }
  .filter-label { display: flex; align-items: baseline; gap: 8px; padding-top: 0; }
  .filter-label span { display: inline; }
  .panes { grid-template-columns: 1fr; }
  .pane + .pane { border-left: 0; border-top: 1px solid var(--line-soft); }
  .pane { padding: 18px; }
  .card-meta { padding: 10px 16px; }
  .stars { margin-left: 0; width: 100%; }
  .draw-btn kbd { display: none; }
}

@media (max-width: 520px) {
  .brand-sub { display: none; }
  .brand-mark { width: 38px; height: 38px; font-size: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}