@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght,SOFT@9..144,300..900,0..100&family=JetBrains+Mono:wght@400;600&family=Source+Serif+4:opsz,wght@8..60,400;8..60,600&display=swap');

:root {
  --bg: #f5f1e8;
  --bg-deep: #ebe5d4;
  --bg-raised: #fdfbf5;
  --ink: #1a1a1a;
  --ink-mute: #6b6354;
  --ink-soft: #9b937f;
  --line: #d8d0bd;
  --line-strong: #bfb69a;

  --dup: #2d5a3d;
  --dup-soft: #d7e5dc;
  --likely: #8b4513;
  --likely-soft: #ebdacb;
  --related: #1e4d8b;
  --related-soft: #d2dbe8;
  --off: #9a2a2a;
  --off-soft: #ebd2cf;
  --unrel: #6b6354;
  --unrel-soft: #e4dcc8;

  --accent: var(--dup);
  --accent-soft: var(--dup-soft);

  --chrome-h: 60px;
  --footer-h: 54px;

  --serif: "Fraunces", "Source Serif 4", Georgia, serif;
  --body-serif: "Source Serif 4", "Fraunces", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --grain-svg: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' seed='7'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.6 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body-serif);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* paper grain overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.035;
  mix-blend-mode: multiply;
  background-image: var(--grain-svg);
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
}
a:hover { text-decoration-color: var(--accent); }

/* ----- classification accent variables per detail page ----- */
body.cls-DUPLICATE        { --accent: var(--dup);     --accent-soft: var(--dup-soft); }
body.cls-LIKELY_DUPLICATE { --accent: var(--likely);  --accent-soft: var(--likely-soft); }
body.cls-RELATED          { --accent: var(--related); --accent-soft: var(--related-soft); }
body.cls-OFF_TOPIC        { --accent: var(--off);     --accent-soft: var(--off-soft); }
body.cls-UNRELATED        { --accent: var(--unrel);   --accent-soft: var(--unrel-soft); }

/* ============ INDEX PAGE ============ */

.index-wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 36px 96px;
}

.index-masthead {
  border-bottom: 2px solid var(--ink);
  padding-bottom: 28px;
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 24px;
}

.wordmark {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144, "SOFT" 50;
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.wordmark em {
  font-style: italic;
  font-variation-settings: "opsz" 144, "SOFT" 100;
  color: var(--ink-mute);
}

.masthead-meta {
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.6;
  text-align: right;
  color: var(--ink-mute);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.masthead-meta b { color: var(--ink); font-weight: 600; }
.masthead-meta .chip {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  margin-left: 6px;
}
.masthead-meta .chip.sonnet { background: #e9daf7; }
.masthead-meta .chip.qwen   { background: #d7e8d2; }

section.group { margin-bottom: 56px; }

.group-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  margin-bottom: 18px;
}
.group-head .group-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.group-head h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-variation-settings: "opsz" 72;
  font-size: 28px;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.group-head .group-count {
  font-family: var(--mono);
  color: var(--ink-mute);
  font-size: 13px;
  margin-left: auto;
}
.group-head .rule {
  flex: 1;
  height: 1px;
  background: var(--line);
}

.group[data-cls="DUPLICATE"] .group-head h2,
.group[data-cls="DUPLICATE"] .group-num { color: var(--dup); }
.group[data-cls="LIKELY_DUPLICATE"] .group-head h2,
.group[data-cls="LIKELY_DUPLICATE"] .group-num { color: var(--likely); }
.group[data-cls="RELATED"] .group-head h2,
.group[data-cls="RELATED"] .group-num { color: var(--related); }
.group[data-cls="OFF_TOPIC"] .group-head h2,
.group[data-cls="OFF_TOPIC"] .group-num { color: var(--off); }

.pair-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.pair-row {
  display: grid;
  grid-template-columns: 56px 1fr 1fr 96px;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  align-items: baseline;
  transition: background 120ms ease;
}
.pair-row:hover {
  background: var(--bg-raised);
  text-decoration: none;
}
.pair-row:hover .pair-n {
  color: var(--accent);
}
.pair-row .pair-n {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
}
.pair-row .pair-query .num,
.pair-row .pair-candidate .num {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--accent);
  margin-right: 8px;
}
.pair-row .pair-query .title,
.pair-row .pair-candidate .title {
  font-family: var(--body-serif);
  font-size: 15px;
  color: var(--ink);
}
.pair-row .pair-query .kind,
.pair-row .pair-candidate .kind {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-mute);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 6px;
}
.pair-row .pair-score {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-mute);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.pair-row .src-badge {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  line-height: 14px;
  text-align: center;
  color: var(--ink);
  margin-left: 6px;
  vertical-align: middle;
}
.src-sonnet { background: #d7aefb; }
.src-qwen   { background: #a5d6a7; }

.group[data-cls="DUPLICATE"] .pair-row .num { color: var(--dup); }
.group[data-cls="LIKELY_DUPLICATE"] .pair-row .num { color: var(--likely); }
.group[data-cls="RELATED"] .pair-row .num { color: var(--related); }
.group[data-cls="OFF_TOPIC"] .pair-row .num { color: var(--off); }

/* ============ DETAIL PAGE ============ */

body.detail {
  overflow: hidden;
  height: 100vh;
}

.detail-layout {
  display: grid;
  grid-template-rows: var(--chrome-h) 1fr var(--footer-h);
  height: 100vh;
}

/* --- chrome (top bar) --- */

.chrome {
  position: relative;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 24px;
  gap: 20px;
  z-index: 10;
}
.chrome::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
}

.chrome-left {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-mute);
}
.chrome .back {
  font-family: var(--serif);
  font-variation-settings: "opsz" 9;
  font-weight: 500;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.005em;
  border-right: 1px solid var(--line-strong);
  padding-right: 14px;
}
.chrome .back:hover { color: var(--accent); text-decoration: none; }
.chrome .pair-id {
  font-family: var(--mono);
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.chrome .pair-id .arrow { color: var(--ink-soft); padding: 0 4px; }

.chrome-center {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-self: center;
}
.chrome .classification {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144, "SOFT" 20;
  font-weight: 500;
  font-size: 20px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-top: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  padding: 3px 14px;
}
.chrome .confidence {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-mute);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.chrome .score {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

.chrome-right {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
}
.chrome button {
  font-family: var(--mono);
  font-size: 11px;
  padding: 7px 14px;
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: all 120ms ease;
}
.chrome button.primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.chrome button:hover { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.chrome button.copied { background: var(--accent); color: var(--bg); }
.chrome button .kbd {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 5px;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-size: 9px;
  opacity: 0.7;
}

/* --- split panes --- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  position: relative;
}

.split::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--accent);
  opacity: 0.35;
  transform: translateX(-0.5px);
  pointer-events: none;
}

.pane {
  overflow-y: auto;
  overflow-x: hidden;
  padding: 36px 44px 80px;
  position: relative;
  scrollbar-color: var(--line-strong) transparent;
  scrollbar-width: thin;
}
.pane::-webkit-scrollbar { width: 10px; }
.pane::-webkit-scrollbar-track { background: transparent; }
.pane::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 6px;
  border: 2px solid var(--bg);
}

.pane-query { border-right: none; }

.kicker {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}
.pane-query .kicker::before { content: "◆ "; color: var(--accent); }
.pane-candidate .kicker::before { content: "◇ "; color: var(--accent); }

.pane h1.item-title {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144, "SOFT" 30, "wght" 450;
  font-size: clamp(24px, 2.8vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 16px;
  color: var(--ink);
}
.pane h1.item-title a {
  color: inherit;
  text-decoration: none;
}
.pane h1.item-title a:hover { color: var(--accent); }

.pane .item-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
}
.pane .item-meta .state {
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 10px;
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.state.open   { background: #d7e8d2; color: #1a3f18; }
.state.closed { background: #ebd2cf; color: #5b1919; }
.state.merged { background: #e6d7f7; color: #3d1963; }
.state.draft  { background: #ebe5d4; color: #6b6354; }
.state.unknown { background: var(--line); color: var(--ink-mute); }

.pane .item-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 28px;
}
.pane .item-labels .label {
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 8px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  color: var(--ink-mute);
  border-radius: 10px;
  letter-spacing: 0.02em;
}

.pane .body {
  font-family: var(--body-serif);
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
}
.pane .body p { margin: 0 0 1em; }
.pane .body > p:first-of-type::first-letter {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144, "wght" 500;
  float: left;
  font-size: 3.4em;
  line-height: 0.85;
  padding: 0.04em 0.08em 0 0;
  color: var(--accent);
}
.pane .body h1, .pane .body h2, .pane .body h3 {
  font-family: var(--serif);
  font-variation-settings: "opsz" 72, "wght" 500;
  letter-spacing: -0.01em;
  margin: 1.4em 0 0.5em;
}
.pane .body h1 { font-size: 1.4em; }
.pane .body h2 { font-size: 1.25em; }
.pane .body h3 { font-size: 1.1em; }
.pane .body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-raised);
  padding: 1px 5px;
  border-radius: 3px;
  border: 1px solid var(--line);
}
.pane .body pre {
  font-family: var(--mono);
  background: #faf6ea;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  padding: 12px 14px;
  overflow-x: auto;
  font-size: 12.5px;
  line-height: 1.5;
  border-radius: 2px;
}
.pane .body pre code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: inherit;
}
.pane .body blockquote {
  margin: 1em 0;
  padding: 0.2em 16px;
  border-left: 3px solid var(--line-strong);
  color: var(--ink-mute);
  font-style: italic;
}
.pane .body ul, .pane .body ol { padding-left: 1.5em; }
.pane .body li { margin: 0.2em 0; }
.pane .body img { max-width: 100%; height: auto; border: 1px solid var(--line); }
.pane .body table {
  border-collapse: collapse;
  font-size: 13px;
  margin: 1em 0;
}
.pane .body th, .pane .body td {
  border: 1px solid var(--line);
  padding: 6px 10px;
  text-align: left;
}
.pane .body th { background: var(--bg-raised); }
.pane .body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.6em 0;
}

/* comments */
.comments {
  margin-top: 48px;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}
.comments-head {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}
.comment {
  margin-bottom: 28px;
  padding-left: 16px;
  border-left: 2px solid var(--line);
}
.comment:hover { border-left-color: var(--accent); }
.comment .comment-meta {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-mute);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.comment .comment-meta .author { color: var(--ink); font-weight: 600; }
.comment .comment-body {
  font-family: var(--body-serif);
  font-size: 14px;
  line-height: 1.6;
}
.comment .comment-body p { margin: 0 0 0.8em; }
.comment .comment-body pre {
  font-family: var(--mono);
  font-size: 11.5px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  padding: 8px 10px;
  overflow-x: auto;
}
.comment .comment-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-raised);
  padding: 1px 4px;
  border-radius: 3px;
}

.empty {
  font-family: var(--body-serif);
  font-style: italic;
  color: var(--ink-soft);
}

/* --- footer nav --- */

.footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 24px;
  position: relative;
  z-index: 10;
}
.footer .nav-prev, .footer .nav-next {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer .nav-prev { justify-self: start; }
.footer .nav-next { justify-self: end; }
.footer .nav-prev:hover, .footer .nav-next:hover { color: var(--accent); }
.footer .nav-prev[aria-disabled="true"],
.footer .nav-next[aria-disabled="true"] {
  color: var(--ink-soft);
  pointer-events: none;
}
.footer .arrow {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 400;
}
.footer .kbd {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid var(--line-strong);
  background: var(--bg-raised);
  border-radius: 2px;
  font-size: 9px;
  color: var(--ink-mute);
}
.footer .position {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.footer .position .cur { color: var(--accent); font-weight: 600; }
.footer .position .sep { color: var(--ink-soft); padding: 0 6px; }
.footer .position .tot { color: var(--ink-mute); }

/* reasoning drawer */

.drawer {
  position: fixed;
  top: var(--chrome-h);
  right: 0;
  width: 360px;
  max-width: 90vw;
  bottom: var(--footer-h);
  background: var(--bg-raised);
  border-left: 1px solid var(--line-strong);
  box-shadow: -6px 0 24px rgba(20, 20, 20, 0.06);
  transform: translateX(100%);
  transition: transform 220ms cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 20;
  overflow-y: auto;
  padding: 28px 28px 48px;
}
.drawer.open { transform: translateX(0); }
.drawer h2 {
  font-family: var(--serif);
  font-variation-settings: "opsz" 72, "wght" 500;
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--ink);
}
.drawer .drawer-meta {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.drawer .drawer-body {
  font-family: var(--body-serif);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}
.drawer .drawer-body p { margin: 0 0 1em; }
.drawer .suggested {
  margin-top: 20px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px dashed var(--line-strong);
  border-left: 3px solid var(--accent);
  font-family: var(--body-serif);
  font-size: 13px;
  color: var(--ink);
}
.drawer .suggested-head {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}

/* keyboard help overlay */

.help-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 26, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(3px);
}
.help-overlay.open { display: flex; }
.help-card {
  background: var(--bg);
  border: 1px solid var(--line-strong);
  padding: 36px 44px;
  max-width: 480px;
  box-shadow: 0 30px 60px rgba(20, 20, 20, 0.2);
}
.help-card h2 {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144, "wght" 500;
  margin: 0 0 20px;
  font-size: 28px;
  letter-spacing: -0.015em;
}
.help-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 24px;
  font-family: var(--body-serif);
  font-size: 14px;
  margin: 0;
}
.help-card dt {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink);
}
.help-card dt kbd {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--line-strong);
  background: var(--bg-raised);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 11px;
}
.help-card dd {
  margin: 0;
  color: var(--ink-mute);
  align-self: center;
}
.help-card .hint {
  margin-top: 24px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* toast / copy confirmation */

.toast {
  position: fixed;
  bottom: calc(var(--footer-h) + 20px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 10px 22px;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  border-radius: 2px;
  opacity: 0;
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
  z-index: 50;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ================================================================ */
/*  MOBILE TAB LAYOUT                                                 */
/*                                                                    */
/*  Two tiered breakpoints:                                           */
/*    - phone (<= 720px): tab-switched panes, card-style index rows   */
/*    - tablet portrait (721–960px): 50/50 vertical stack             */
/* ================================================================ */

/* tab switcher is hidden by default (desktop side-by-side) */
.pane-tabs { display: none; }

/* --- tablet portrait: vertical 50/50 stack --- */

@media (max-width: 960px) and (min-width: 721px),
       (max-aspect-ratio: 1/1) and (min-width: 721px) {
  .split {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }
  .split::before {
    top: 50%;
    bottom: auto;
    left: 0;
    right: 0;
    width: 100%;
    height: 1px;
    transform: translateY(-0.5px);
  }
  .pane-query {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
  .pane { padding: 28px 30px 60px; }
}

/* --- phones: tab switcher --- */

@media (max-width: 720px) {
  :root {
    --footer-h: 58px;
  }

  /* --- detail layout: chrome (auto) / main (fills) / footer --- */
  .detail-layout {
    grid-template-rows: auto 1fr var(--footer-h);
  }

  /* compact 2-row chrome */
  .chrome {
    display: flex;
    flex-wrap: wrap;
    padding: 10px 14px 12px;
    gap: 6px 14px;
    align-items: baseline;
    min-height: 0;
  }
  .chrome::before { height: 2px; }
  .chrome-left {
    flex: 1 1 auto;
    display: flex;
    align-items: baseline;
    gap: 10px;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
  }
  .chrome .back {
    border-right: none;
    padding-right: 0;
    font-size: 13px;
  }
  .chrome .pair-id { font-size: 11px; letter-spacing: 0.01em; }
  .chrome-center {
    flex: 1 1 100%;
    order: 3;
    justify-self: start;
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding-top: 2px;
  }
  .chrome .classification {
    font-size: 14px;
    padding: 2px 10px;
    letter-spacing: 0.06em;
  }
  .chrome .confidence, .chrome .score { font-size: 9px; }
  .chrome-right {
    flex: 0 0 auto;
    order: 2;
    gap: 6px;
    justify-self: end;
  }
  .chrome button {
    font-size: 10px;
    padding: 6px 10px;
  }
  .chrome button .kbd { display: none; }

  /* --- tab switcher --- */

  .pane-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--bg-deep);
    border-bottom: 1px solid var(--line-strong);
    border-top: 1px solid var(--line);
    position: relative;
    z-index: 8;
  }
  .pane-tab {
    appearance: none;
    background: transparent;
    border: 0;
    padding: 12px 10px 10px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--ink-mute);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-weight: 600;
    min-height: 44px;  /* tap target */
    -webkit-tap-highlight-color: transparent;
    transition: color 120ms ease, border-color 120ms ease;
  }
  .pane-tab .mark {
    font-family: var(--serif);
    font-size: 14px;
    color: var(--accent);
  }
  .pane-tab .ref {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--ink);
    font-weight: 700;
  }
  .pane-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }
  .pane-tab.active .ref { color: var(--accent); }
  .pane-tab + .pane-tab {
    border-left: 1px solid var(--line);
  }

  /* single-pane display */
  .split {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    overflow: hidden;
  }
  .split::before { display: none; }
  .pane-tabs { grid-row: 1; grid-column: 1; }
  .pane-query, .pane-candidate {
    grid-row: 2;
    grid-column: 1;
    display: none;
    padding: 22px 18px 80px;
    border: 0;
  }
  .split[data-active="query"] .pane-query { display: block; }
  .split[data-active="candidate"] .pane-candidate { display: block; }
  .split:not([data-active="candidate"]) .pane-query { display: block; }

  /* per-pane header density */
  .pane .kicker { font-size: 9px; }
  .pane h1.item-title {
    font-size: 22px;
    line-height: 1.18;
    margin: 0 0 12px;
  }
  .pane .item-meta {
    font-size: 10px;
    gap: 10px 12px;
    padding-bottom: 10px;
    margin-bottom: 14px;
  }
  .pane .item-labels { margin-bottom: 18px; }
  .pane .item-labels .label { font-size: 9px; padding: 1px 6px; }
  .pane .body { font-size: 14.5px; line-height: 1.6; }
  .pane .body > p:first-of-type::first-letter {
    font-size: 2.5em;
    padding: 0.03em 0.08em 0 0;
  }
  .pane .body pre { font-size: 11.5px; padding: 10px 12px; }
  .pane .body h1 { font-size: 1.3em; }
  .pane .body h2 { font-size: 1.18em; }
  .pane .body h3 { font-size: 1.06em; }

  .comments { margin-top: 36px; padding-top: 18px; }
  .comment { margin-bottom: 22px; padding-left: 12px; }
  .comment .comment-body { font-size: 13.5px; }

  /* --- footer: bigger touch targets --- */
  .footer { padding: 0 14px; }
  .footer .nav-prev, .footer .nav-next {
    font-size: 11px;
    padding: 8px 10px;
    min-height: 44px;
    min-width: 44px;
  }
  .footer .position { font-size: 13px; }
  .footer .kbd { display: none; }

  /* --- drawer: bottom sheet instead of side panel --- */
  .drawer {
    top: auto;
    right: 0;
    left: 0;
    width: 100%;
    max-width: none;
    bottom: var(--footer-h);
    max-height: 65vh;
    border-left: 0;
    border-top: 1px solid var(--line-strong);
    box-shadow: 0 -6px 24px rgba(20, 20, 20, 0.08);
    transform: translateY(100%);
    padding: 22px 20px 48px;
  }
  .drawer.open { transform: translateY(0); }

  /* --- help overlay: smaller card --- */
  .help-card { padding: 26px 28px; max-width: 320px; }
  .help-card h2 { font-size: 22px; }
  .help-card dl { font-size: 13px; gap: 6px 16px; }

  /* ================================================================ */
  /*  Index page, phone                                                 */
  /* ================================================================ */

  body.index { overflow-x: hidden; }
  .index-wrap { padding: 28px 18px 72px; }
  .index-masthead {
    grid-template-columns: 1fr;
    gap: 14px;
    padding-bottom: 22px;
    margin-bottom: 30px;
  }
  .wordmark { font-size: 40px; letter-spacing: -0.02em; }
  .masthead-meta { text-align: left; font-size: 10px; line-height: 1.8; }
  .masthead-meta .chip { margin-left: 0; margin-right: 4px; }

  section.group { margin-bottom: 38px; }
  .group-head {
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 14px;
    margin-bottom: 12px;
  }
  .group-head h2 { font-size: 22px; letter-spacing: -0.01em; }
  .group-head .group-count {
    flex: 1 1 100%;
    margin-left: 0;
    font-size: 11px;
  }
  .group-head .rule { display: none; }

  /* three-line card rows */
  .pair-row {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto auto;
    gap: 3px 12px;
    padding: 14px 0 16px;
  }
  .pair-row .pair-n {
    grid-column: 1;
    grid-row: 1;
    font-size: 10px;
  }
  .pair-row .pair-score {
    grid-column: 2;
    grid-row: 1;
    font-size: 11px;
  }
  .pair-row .pair-query {
    grid-column: 1 / -1;
    grid-row: 2;
    display: block;
  }
  .pair-row .pair-query .title,
  .pair-row .pair-candidate .title {
    font-size: 14px;
    line-height: 1.35;
  }
  .pair-row .pair-query .kind,
  .pair-row .pair-candidate .kind {
    font-size: 9px;
  }
  .pair-row .pair-candidate {
    grid-column: 1 / -1;
    grid-row: 3;
    display: block;
    position: relative;
    padding-left: 18px;
    margin-top: 2px;
  }
  .pair-row .pair-candidate::before {
    content: "↳";
    position: absolute;
    left: 3px;
    top: 0;
    color: var(--ink-soft);
    font-family: var(--serif);
  }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}