:root {
  color-scheme: light;
  --bg: #f6f1e8;
  --surface: #fffdf8;
  --surface-2: #fbf6ed;
  --surface-3: #f1eadf;
  --ink: #201c17;
  --ink-soft: #4e463c;
  --ink-faint: #82786b;
  --line: #e1d8ca;
  --line-strong: #cfc1ae;
  --shadow: 0 12px 34px rgba(68, 52, 34, .08);
  --focus: rgba(37, 99, 235, .18);
  --op: #9a5b24;
  --op-bg: #f4dfc5;
  --gt: #246b4f;
  --gt-bg: #dfeee5;
  --pt: #8f6c19;
  --pt-bg: #f2e9c6;
  --qg: #315f9b;
  --qg-bg: #dfebf8;
  --qo: #7750a6;
  --qo-bg: #eadff5;
  --serif: "Cormorant Garamond", "Noto Serif SC", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --zh-serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", serif;
}

:root.dark {
  color-scheme: dark;
  --bg: #111315;
  --surface: #1b1d20;
  --surface-2: #22252a;
  --surface-3: #2b3036;
  --ink: #f3eee6;
  --ink-soft: #d8cfc2;
  --ink-faint: #a79d90;
  --line: #343941;
  --line-strong: #4a515c;
  --shadow: 0 18px 44px rgba(0, 0, 0, .28);
  --focus: rgba(125, 170, 255, .26);
  --op: #e3a363;
  --op-bg: #3a2b1d;
  --gt: #7cc5a4;
  --gt-bg: #1d3129;
  --pt: #d4bd62;
  --pt-bg: #343019;
  --qg: #8eb7ed;
  --qg-bg: #1d2d43;
  --qo: #c4a0ec;
  --qo-bg: #30233e;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--surface-3) 72%, transparent) 0, var(--bg) 320px),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  padding-bottom: 72px;
  -webkit-font-smoothing: antialiased;
}

button,
input { font: inherit; }
button { border: 0; }

.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 58px 32px 34px;
}
.hero h1 {
  max-width: 840px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(40px, 7vw, 74px);
  font-weight: 600;
  letter-spacing: 0;
  line-height: .98;
  margin-bottom: 14px;
}
.hero h1 em {
  color: var(--op);
  font-style: italic;
}
.subtitle {
  color: var(--ink-soft);
  font-family: var(--zh-serif);
  font-size: clamp(16px, 2vw, 20px);
  margin-bottom: 6px;
}
.meta {
  color: var(--ink-faint);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  border-block: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 32px;
}
.search {
  flex: 1 1 280px;
  min-width: 220px;
  position: relative;
}
.search input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  outline: 0;
  padding: 10px 48px 10px 40px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.search input:focus {
  border-color: var(--qg);
  box-shadow: 0 0 0 4px var(--focus);
}
.search svg,
.search kbd {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}
.search svg {
  left: 14px;
  color: var(--ink-faint);
}
.search kbd {
  right: 12px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--ink-faint);
  font-size: 11px;
  padding: 1px 6px;
}
.pills,
.audio-toggle,
.syns {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.pill,
.audio-toggle button,
.theme-toggle,
.syn {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 600;
  transition: border-color .15s, background .15s, color .15s, transform .15s;
  user-select: none;
  white-space: nowrap;
}
.pill {
  font-size: 12px;
  padding: 7px 11px;
}
.pill:hover,
.theme-toggle:hover,
.syn:hover {
  border-color: var(--line-strong);
  background: var(--surface-2);
  color: var(--ink);
}
.pill .count {
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  margin-left: 4px;
}
.pill.active[data-cat="op"] { background: var(--op-bg); border-color: var(--op); color: var(--op); }
.pill.active[data-cat="gt"] { background: var(--gt-bg); border-color: var(--gt); color: var(--gt); }
.pill.active[data-cat="pt"] { background: var(--pt-bg); border-color: var(--pt); color: var(--pt); }
.pill.active[data-cat="qg"] { background: var(--qg-bg); border-color: var(--qg); color: var(--qg); }
.pill.active[data-cat="qo"] { background: var(--qo-bg); border-color: var(--qo); color: var(--qo); }
.pill.active[data-cat="all"] { background: var(--ink); border-color: var(--ink); color: var(--surface); }
.pill.active .count { color: currentColor; opacity: .75; }

.audio-toggle {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  padding: 3px;
}
.audio-toggle button {
  border: 0;
  background: transparent;
  color: var(--ink-faint);
  font-size: 11px;
  padding: 5px 9px;
}
.audio-toggle button.active {
  background: var(--ink);
  color: var(--surface);
}
.theme-toggle {
  min-height: 34px;
  padding: 6px 12px;
  font-size: 12px;
}

main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 30px 32px 0;
}
.book-panel {
  display: grid;
  grid-template-columns: minmax(240px, 330px) 1fr;
  gap: 22px;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 22px;
}
.book-copy {
  border-right: 1px solid var(--line);
  padding-right: 22px;
}
.book-kicker {
  color: var(--op);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.book-copy h2 {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1.08;
  margin-bottom: 10px;
}
.book-copy p:last-child {
  color: var(--ink-faint);
  font-family: var(--zh-serif);
}
.rule-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px;
}
.rule-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  padding: 12px;
}
.rule-card strong {
  display: block;
  color: var(--ink);
  font-size: 13px;
  margin-bottom: 5px;
}
.rule-card p {
  color: var(--ink-soft);
  font-family: var(--zh-serif);
  font-size: 12.5px;
  line-height: 1.5;
}
.rule-card em {
  display: block;
  color: var(--ink-faint);
  font-size: 11px;
  font-style: normal;
  margin-top: 7px;
}
.status,
.empty {
  color: var(--ink-faint);
  font-family: var(--serif);
  font-size: 20px;
  font-style: italic;
  padding: 80px 32px;
  text-align: center;
}
.empty { display: none; }
.empty.show { display: block; }

.section {
  margin-top: 52px;
  scroll-margin-top: 92px;
}
.section:first-child { margin-top: 40px; }
.section-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: end;
  gap: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 12px;
}
.section-header h2 {
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1;
}
.section-header .zh {
  color: var(--ink-soft);
  font-family: var(--zh-serif);
  font-size: 16px;
}
.section-header .count {
  color: var(--ink-faint);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  white-space: nowrap;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 14px;
}

.card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: 0 1px 0 rgba(0, 0, 0, .02);
  padding: 18px 18px 16px;
  transition: border-color .15s, transform .15s, box-shadow .15s, background .15s;
}
.card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.card.learned {
  background: linear-gradient(180deg, color-mix(in srgb, var(--gt-bg) 26%, var(--surface)), var(--surface));
}
.card.learned .word::after {
  content: "learned";
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .08em;
  margin-left: 8px;
  text-transform: uppercase;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
}
.card[data-cat="op"]::before { background: var(--op); }
.card[data-cat="gt"]::before { background: var(--gt); }
.card[data-cat="pt"]::before { background: var(--pt); }
.card[data-cat="qg"]::before { background: var(--qg); }
.card[data-cat="qo"]::before { background: var(--qo); }
.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.word-row {
  display: flex;
  align-items: center;
  gap: 3px;
  min-width: 0;
}
.word {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.05;
  overflow-wrap: anywhere;
}
.tag {
  border-radius: 5px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .1em;
  padding: 3px 8px;
  text-transform: uppercase;
}
.card[data-cat="op"] .tag { background: var(--op-bg); color: var(--op); }
.card[data-cat="gt"] .tag { background: var(--gt-bg); color: var(--gt); }
.card[data-cat="pt"] .tag { background: var(--pt-bg); color: var(--pt); }
.card[data-cat="qg"] .tag { background: var(--qg-bg); color: var(--qg); }
.card[data-cat="qo"] .tag { background: var(--qo-bg); color: var(--qo); }

.def-zh,
.def-en,
.example {
  border-left: 2px solid var(--line);
  padding-left: 10px;
}
.def-zh {
  color: var(--ink);
  font-family: var(--zh-serif);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 5px;
}
.def-zh::before,
.def-en::before,
.example .en::before,
.example .zh::before {
  display: block;
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .1em;
  margin-bottom: 2px;
  text-transform: uppercase;
}
.def-zh::before { content: "中文"; }
.def-en {
  color: var(--ink-soft);
  font-size: 13.5px;
  font-style: italic;
  line-height: 1.45;
  margin-bottom: 12px;
}
.def-en::before { content: "English"; }
.example {
  position: relative;
  border-radius: 0 8px 8px 0;
  margin-bottom: 12px;
  padding: 10px 34px 10px 10px;
}
.card[data-cat="op"] .example { border-left-color: var(--op); background: color-mix(in srgb, var(--op-bg) 44%, transparent); }
.card[data-cat="gt"] .example { border-left-color: var(--gt); background: color-mix(in srgb, var(--gt-bg) 48%, transparent); }
.card[data-cat="pt"] .example { border-left-color: var(--pt); background: color-mix(in srgb, var(--pt-bg) 50%, transparent); }
.card[data-cat="qg"] .example { border-left-color: var(--qg); background: color-mix(in srgb, var(--qg-bg) 50%, transparent); }
.card[data-cat="qo"] .example { border-left-color: var(--qo); background: color-mix(in srgb, var(--qo-bg) 50%, transparent); }
.example .en {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  font-style: italic;
  line-height: 1.4;
  margin-bottom: 8px;
}
.example .en::before { content: "Example"; }
.example .zh {
  color: var(--ink-soft);
  font-family: var(--zh-serif);
  font-size: 14px;
  line-height: 1.45;
}
.example .zh::before { content: "译文"; }
.syn {
  background: var(--surface-2);
  border-color: var(--line);
  font-size: 12px;
  padding: 5px 10px;
}
.card[data-cat="op"] .syn.active { background: var(--op); border-color: var(--op); color: var(--surface); }
.card[data-cat="gt"] .syn.active { background: var(--gt); border-color: var(--gt); color: var(--surface); }
.card[data-cat="pt"] .syn.active { background: var(--pt); border-color: var(--pt); color: var(--surface); }
.card[data-cat="qg"] .syn.active { background: var(--qg); border-color: var(--qg); color: var(--surface); }
.card[data-cat="qo"] .syn.active { background: var(--qo); border-color: var(--qo); color: var(--surface); }
.syn-panel {
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  padding: 11px 12px;
}
.syn-panel-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
  border-bottom: 1px dashed var(--line-strong);
  padding-bottom: 6px;
}
.sp-word {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 650;
}
.sp-vs,
.sp-label {
  color: var(--ink-faint);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.sp-row {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 8px;
  font-size: 13px;
  line-height: 1.5;
  margin-bottom: 6px;
}
.sp-val {
  color: var(--ink);
  font-family: var(--zh-serif);
}

.speak {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: transparent;
  color: var(--ink-faint);
  cursor: pointer;
  margin-left: 4px;
  transition: background .15s, color .15s, transform .15s;
}
.speak:hover {
  background: var(--surface-2);
  color: var(--ink);
}
.speak svg {
  width: 15px;
  height: 15px;
  pointer-events: none;
}
.speak.playing {
  animation: pulse 1.2s ease-in-out infinite;
}
.example .speak {
  position: absolute;
  top: 8px;
  right: 6px;
  background: color-mix(in srgb, var(--surface) 78%, transparent);
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .72; transform: scale(1.14); }
}

footer {
  max-width: 1280px;
  margin: 64px auto 0;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 12px;
  letter-spacing: .05em;
  padding: 28px 32px;
  text-align: center;
}

@media print {
  .nav,
  .hero .meta,
  .speak,
  .theme-toggle { display: none; }
  body { background: white; color: #111; }
  .card,
  .book-panel {
    border: 1px solid #ddd;
    box-shadow: none;
    break-inside: avoid;
  }
  .grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 820px) {
  .hero { padding: 44px 20px 28px; }
  .nav-inner,
  main { padding-inline: 18px; }
  .book-panel { grid-template-columns: 1fr; }
  .book-copy {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding-right: 0;
    padding-bottom: 16px;
  }
  .section-header {
    align-items: flex-start;
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .grid { grid-template-columns: 1fr; }
}