:root {
  --paper: #EEF0EA;
  --paper-raised: #E4E7DE;
  --paper-line: #CBD0C3;
  --ink: #16211D;
  --ink-soft: #47554E;
  --blueprint: #1F4B4C;
  --blueprint-soft: #3F6E6C;
  --signal: #A34A19;
  --signal-soft: #C77A4A;
  --good: #2F6B3A;
  --bad: #A3352E;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 3px;
  --grid-line: rgba(31, 75, 76, 0.09);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #101B18;
    --paper-raised: #17251F;
    --paper-line: #2B3D35;
    --ink: #E9ECE4;
    --ink-soft: #A9B6AC;
    --blueprint: #7FB5AE;
    --blueprint-soft: #5C948C;
    --signal: #E08A4C;
    --signal-soft: #C77A4A;
    --good: #6FBF7A;
    --bad: #E17169;
    --grid-line: rgba(127, 181, 174, 0.08);
  }
}
:root[data-theme="dark"] {
  --paper: #101B18;
  --paper-raised: #17251F;
  --paper-line: #2B3D35;
  --ink: #E9ECE4;
  --ink-soft: #A9B6AC;
  --blueprint: #7FB5AE;
  --blueprint-soft: #5C948C;
  --signal: #E08A4C;
  --signal-soft: #C77A4A;
  --good: #6FBF7A;
  --bad: #E17169;
  --grid-line: rgba(127, 181, 174, 0.08);
}

* { box-sizing: border-box; }

html, body {
  background: var(--paper);
  color: var(--ink);
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blueprint); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--signal); }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--paper-raised);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

h1, h2, h3 { font-family: var(--sans); font-weight: 600; margin: 0; color: var(--ink); }

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}
.wrap.narrow { max-width: 720px; }

/* ---------- Topbar ---------- */
.topbar {
  border-bottom: 1px solid var(--paper-line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.wordmark {
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}
.unofficial-tag {
  color: var(--signal);
}
.lang-toggle {
  font-family: var(--mono);
  font-size: 12px;
  background: transparent;
  border: 1px solid var(--paper-line);
  color: var(--ink-soft);
  padding: 5px 10px;
  border-radius: var(--radius);
  cursor: pointer;
}
.lang-toggle:hover { border-color: var(--blueprint); color: var(--blueprint); }

/* ---------- Hero ---------- */
.hero {
  padding: 52px 0 40px;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  border-bottom: 1px solid var(--paper-line);
}
.kicker {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--blueprint-soft);
  margin: 0 0 14px;
}
.hero-headline {
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1.18;
  max-width: 18ch;
  margin-bottom: 16px;
}
.hero-sub {
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: 17px;
  margin: 0 0 30px;
}
.stat-tiles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  max-width: 780px;
}
.tile {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-left: 3px solid var(--blueprint);
  padding: 16px 16px 14px;
  border-radius: var(--radius);
}
.tile.is-winner { border-left-color: var(--signal); }
.tile-value {
  font-family: var(--mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}
.tile-label {
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 6px;
}
.status-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--signal);
  font-family: var(--mono);
}

/* ---------- Sections ---------- */
.section { padding: 52px 0; }
.section.alt { background: var(--paper-raised); }
.section h2 {
  font-size: clamp(21px, 2.6vw, 26px);
  margin-bottom: 14px;
}
.section-intro {
  max-width: 74ch;
  color: var(--ink-soft);
  margin: 0 0 24px;
}
.fine-print {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin-top: 18px;
}
.about-section p, .section.narrow p { max-width: 68ch; }

/* ---------- Corpus list ---------- */
.corpus-list {
  display: grid;
  gap: 8px;
  margin: 18px 0;
}
.corpus-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--paper-line);
  font-size: 14.5px;
}
.corpus-item a { color: var(--ink); }
.corpus-item a:hover { color: var(--blueprint); }
.corpus-chars {
  font-family: var(--mono);
  color: var(--ink-soft);
  white-space: nowrap;
  font-size: 13px;
}

/* ---------- Tables ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--paper-line);
}
.data-table th {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 12.5px;
  color: var(--ink-soft);
  text-transform: none;
}
.data-table td.num, .data-table th.num { text-align: right; font-family: var(--mono); }
.data-table tr.winner-row td { color: var(--ink); font-weight: 600; }
.data-table tr.winner-row { background: rgba(163, 74, 25, 0.07); }
.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 2px 7px;
  border-radius: 10px;
  background: var(--signal);
  color: var(--paper);
  margin-left: 8px;
}
.table-scroll { overflow-x: auto; border: 1px solid var(--paper-line); border-radius: var(--radius); }
.table-scroll .data-table { min-width: 560px; }

.placeholder-note {
  border: 1px dashed var(--paper-line);
  border-radius: var(--radius);
  padding: 20px;
  color: var(--ink-soft);
  font-size: 14.5px;
}

/* ---------- Rerank compare cards ---------- */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.compare-card {
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--paper);
}
.compare-card h3 { font-size: 15px; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.compare-metric { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid var(--paper-line); font-size: 14px; }
.compare-metric:last-child { border-bottom: none; }
.compare-metric .v { font-family: var(--mono); font-weight: 600; }
.example-q { margin-top: 14px; font-size: 13.5px; color: var(--ink-soft); border-top: 1px dashed var(--paper-line); padding-top: 10px; }

/* ---------- Architecture ---------- */
.arch-section { background: var(--paper); }
.diagram-frame {
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 12px;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  overflow-x: auto;
}
.diagram-frame svg { display: block; min-width: 640px; width: 100%; height: auto; }

/* ---------- Live ask ---------- */
.live-section { background: var(--paper-raised); }
.ask-form { display: flex; gap: 10px; flex-wrap: wrap; }
.ask-form input {
  flex: 1 1 260px;
  font-family: var(--sans);
  font-size: 15px;
  padding: 11px 14px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
}
.ask-form input:focus-visible { outline: 2px solid var(--blueprint); outline-offset: 1px; }
.ask-form button {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15px;
  padding: 11px 20px;
  border: 1px solid var(--blueprint);
  background: var(--blueprint);
  color: var(--paper);
  border-radius: var(--radius);
  cursor: pointer;
}
.ask-form button:hover { background: var(--blueprint-soft); border-color: var(--blueprint-soft); }
.ask-form button:disabled { opacity: 0.5; cursor: not-allowed; }
.ask-result { margin-top: 20px; min-height: 1px; }
.ask-answer {
  border: 1px solid var(--paper-line);
  border-left: 3px solid var(--blueprint);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--paper);
}
.ask-answer .sources { margin-top: 10px; font-size: 13px; color: var(--ink-soft); }
.ask-answer .sources a { color: var(--ink-soft); }
.ask-error {
  border: 1px dashed var(--bad);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--bad);
  font-size: 14.5px;
}
.ask-loading { color: var(--ink-soft); font-family: var(--mono); font-size: 14px; }

/* ---------- About / footer ---------- */
.disclaimer { font-size: 13px; color: var(--ink-soft); border-top: 1px solid var(--paper-line); padding-top: 14px; margin-top: 22px; }
.site-footer {
  border-top: 1px solid var(--paper-line);
  padding: 22px 0 40px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- Focus & motion ---------- */
:focus-visible { outline: 2px solid var(--blueprint); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .stat-tiles { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .hero { padding: 36px 0 30px; }
  .section { padding: 38px 0; }
}