:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #5f6368;
  --faint: #8a8f98;
  --line: #e6e8eb;
  --panel: #f7f8fa;
  --accent: #1a73e8;
  --ours: #eaf2fe;
  --good: #188038;
  --bad: #c5221f;
  --eyebrow: #188038;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 56px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

/* ---------- nav ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: center;
  gap: 1.6rem;
  padding: 0.7rem 16px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
  font-weight: 500;
}
.topnav a { color: var(--muted); }
.topnav a:hover { color: var(--text); text-decoration: none; }

/* ---------- hero ---------- */
.hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 3.5rem 16px 1rem;
  text-align: center;
}

.title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1.2rem;
}

.authors {
  font-size: 1.05rem;
  margin: 0 0 0.3rem;
}
.authors a { margin: 0 0.45rem; white-space: nowrap; }
.authors sup { color: var(--muted); font-size: 0.7em; }

.affiliations {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 0.2rem 0 1.2rem;
}
.small { font-size: 0.8rem; }

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
}
.pill.dark { background: #202124; color: #fff; }
.pill.dark:hover { background: #3c4043; text-decoration: none; }
.pill.muted { background: var(--panel); color: var(--faint); border-color: var(--line); cursor: default; }
.soon { font-size: 0.75rem; }

/* ---------- sections ---------- */
.section {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 16px;
}
.section.wide { max-width: 1100px; }

h2 {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-align: center;
  margin: 0 0 1.4rem;
}

h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2.6rem 0 1rem;
}

#abstract p { text-align: justify; hyphens: auto; }

/* ---------- motivation ---------- */
.eyebrow {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--eyebrow);
  margin: 0 0 0.4rem;
}

.headline {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 1rem;
}
.headline em { font-style: italic; color: var(--accent); }

.lead {
  max-width: 680px;
  margin: 0 auto 2rem;
  text-align: center;
  font-size: 1.08rem;
  color: #3c4043;
}

.prompt-label {
  text-align: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0;
}
.prompt {
  text-align: center;
  font-style: italic;
  font-size: 1.05rem;
  margin: 0.2rem auto 1.4rem;
  max-width: 640px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.card {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg);
  display: flex;
  flex-direction: column;
}
.card.ours { border: 2px solid var(--accent); }

.card-img {
  height: 280px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.card-img img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; }

.card figcaption { padding: 0.9rem 1rem 1.1rem; font-size: 0.9rem; color: #3c4043; }
.card h3 { margin: 0; font-size: 1.05rem; color: var(--text); }
.card .examples { margin: 0 0 0.6rem; color: var(--faint); font-size: 0.8rem; }
.card p { margin: 0.5rem 0 0; }
.card .credit { color: var(--faint); font-size: 0.75rem; }

.checks { list-style: none; margin: 0; padding: 0; font-weight: 600; font-size: 0.88rem; }
.checks li { padding-left: 1.5rem; position: relative; }
.checks li::before {
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0;
}
.checks .yes { color: var(--good); }
.checks .yes::before { content: '\f00c'; }
.checks .no { color: var(--bad); }
.checks .no::before { content: '\f00d'; }

.statement {
  max-width: 720px;
  margin: 2.4rem auto 2rem;
  text-align: center;
  font-size: 1.08rem;
}

/* ---------- figures ---------- */
.figure { margin: 1.4rem 0; }
.figure img { width: 100%; border-radius: 8px; }
.figure video { width: 100%; height: auto; border-radius: 8px; background: #000; display: block; }
.figure.narrow { max-width: 680px; margin-left: auto; margin-right: auto; }
.figure.small { max-width: 520px; margin-left: auto; margin-right: auto; }
.figure figcaption, .note {
  font-size: 0.88rem;
  color: var(--muted);
  text-align: center;
  margin-top: 0.7rem;
  line-height: 1.5;
}
.note { margin-top: 0.5rem; }

.two-up {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: start;
}

/* ---------- method ---------- */
.phases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.8rem 0;
}
.phase {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  font-size: 0.9rem;
}
.phase h3 { margin: 0 0 0.4rem; font-size: 1rem; }
.phase p { margin: 0; color: #3c4043; }
.phase .phase-tag {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

/* ---------- results ---------- */
.setup {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.9rem 1.1rem;
  font-size: 0.9rem;
}
.setup p { margin: 0; }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}
.results th, .results td {
  padding: 0.5rem 0.6rem;
  text-align: center;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.results th { font-weight: 600; border-bottom: 2px solid #c9ccd1; }
.results td:first-child, .results th:first-child { text-align: left; }
.results tr.gt td { color: var(--muted); font-style: italic; }
.results tr.ours td { background: var(--ours); }
.results tr td.task {
  white-space: normal;
  min-width: 190px;
  font-style: normal;
  color: var(--text);
  background: var(--bg) !important;
  vertical-align: middle;
}

.results tr.sep td { border-top: 2px solid #c9ccd1; }

.breakdown { margin: 0.8rem 0 0.4rem; }
.breakdown summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  text-align: center;
  list-style-position: inside;
}
.breakdown[open] summary { margin-bottom: 0.6rem; }

/* ---------- bibtex ---------- */
.bib-head { display: flex; align-items: center; justify-content: space-between; }
.bib-head h2 { margin: 0; text-align: left; }
.copy-btn {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.copy-btn:hover { background: var(--line); }

pre {
  margin: 1rem 0 0;
  padding: 1rem 1.2rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', ui-monospace, Menlo, monospace;
  font-size: 0.82rem;
  line-height: 1.5;
}

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding: 2rem 16px 2.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}
.footer p { margin: 0.3rem 0; }
.footer .ai, .footer .fab { font-size: 1.4rem; color: var(--muted); margin: 0 0.4rem; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .cards, .phases, .two-up { grid-template-columns: 1fr; }
  .card-img { height: 240px; }
}

@media (max-width: 640px) {
  .title { font-size: 1.8rem; }
  .title br { display: none; }
  .headline { font-size: 2.2rem; }
  .two-up { grid-template-columns: 1fr; }
  .topnav { gap: 1rem; }
  .results { font-size: 0.78rem; }
  .widget-ui { padding: 0.9rem 0.8rem 0.8rem; }
  .widget-intro { text-align: left; hyphens: manual; }
  .seg button { padding: 0 0.6rem; font-size: 0.8rem; }
  #cur-shuffle { padding: 0 0.8rem; }

  .slider-label { margin-left: 0; width: 100%; }
  .slider-label input[type=range] { flex: 1; width: auto; }
  .readout { margin-left: 0; width: 100%; }
}

/* ---------- interactive widgets ---------- */
.js-only { display: none; }
.js .js-only { display: block; }
.js .nojs-note { display: none; }
.nojs-note { font-size: 0.9rem; color: var(--muted); background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 0.7rem 0.9rem; }
.widget { margin: 1rem 0 2rem; }
.widget-ui { border: 1px solid var(--line); border-radius: 12px; padding: 1.1rem 1.25rem 1rem; background: var(--bg); box-shadow: 0 1px 2px rgba(60, 64, 67, 0.06); }
.widget svg { width: 100%; height: auto; display: block; touch-action: manipulation; overflow: visible; }
.widget .note { max-width: 780px; margin-left: auto; margin-right: auto; }
.faint { color: var(--faint); }
.widget-intro { max-width: 780px; margin: 0 auto 1rem; font-size: 0.95rem; color: #3c4043; text-align: justify; hyphens: auto; }
.narration { margin: 0.9rem 0 0; padding: 0.7rem 0.9rem; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; font-size: 0.88rem; color: #3c4043; line-height: 1.5; }
.narration.mode { margin-top: 0.5rem; background: #fff; }
.narration em { font-style: normal; font-weight: 700; color: var(--accent); margin-right: 0.35rem; white-space: nowrap; }
.swap { display: grid; }
.swap > span { grid-area: 1 / 1; visibility: hidden; opacity: 0; transition: opacity 0.3s ease; }
.swap > span.on { visibility: visible; opacity: 1; }
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 0.8rem; margin-bottom: 0.9rem; font-size: 0.88rem; }
.btn-group { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.btn {
  font: inherit; font-size: 0.88rem; font-weight: 500;
  min-height: 40px; padding: 0 1.05rem;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--panel); color: var(--text); cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: var(--line); }
.btn.primary { background: #202124; border-color: #202124; color: #fff; min-width: 88px; }
.btn.primary:hover { background: #3c4043; }
.btn:focus-visible, .tab:focus-visible, input[type=range]:focus-visible, .seg button:focus-visible, .tick:focus-visible, th.sortable:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.seg { display: inline-flex; background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.seg button {
  white-space: nowrap;
  font: inherit; font-size: 0.86rem; font-weight: 600; min-height: 34px; padding: 0 1rem;
  border: 0; border-radius: 999px; background: transparent; color: var(--muted); cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.seg button.seg-on { background: #fff; color: var(--text); box-shadow: 0 1px 3px rgba(60, 64, 67, 0.25); }
.slider-label { display: inline-flex; align-items: center; gap: 0.6rem; margin-left: auto; color: var(--muted); font-weight: 500; }
.slider-label .val { color: var(--text); min-width: 1ch; }
.readout { margin-left: auto; color: var(--muted); font-size: 0.86rem; }
.readout b { color: var(--text); }
input[type=range] { -webkit-appearance: none; appearance: none; height: 28px; background: transparent; cursor: pointer; margin: 0; }
.slider-label input[type=range] { width: 150px; }
input[type=range]::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: var(--line); }
input[type=range]::-moz-range-track { height: 4px; border-radius: 2px; background: var(--line); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; margin-top: -8px; border-radius: 50%; background: var(--accent); border: 3px solid #fff; box-shadow: 0 1px 4px rgba(60, 64, 67, 0.4); }
input[type=range]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); border: 3px solid #fff; box-shadow: 0 1px 4px rgba(60, 64, 67, 0.4); }
.stage-slider { position: relative; padding-bottom: 3.1rem; margin-top: 0.5rem; }
.stage-slider input[type=range] { width: 100%; display: block; }
.stage-slider .tick {
  position: absolute; top: 30px; transform: translateX(-50%); width: max-content; white-space: nowrap;
  display: flex; flex-direction: column; align-items: center; line-height: 1.25;
  font: inherit; font-size: 0.78rem; color: var(--faint); background: none; border: 0; padding: 4px 6px; cursor: pointer; min-width: 44px;
}
.stage-slider .tick b { font-size: 0.86rem; font-weight: 600; color: var(--muted); }
.stage-slider .tick.cur b, .stage-slider .tick.cur span { color: var(--accent); }
.legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.3rem 1.1rem; margin: 0.9rem 0 0; font-size: 0.8rem; color: var(--muted); }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; vertical-align: -1px; }
.d-prefix { background: #5f6368; }
.d-live { background: #fff; border: 2px solid var(--accent); width: 11px; height: 11px; }
.d-dead { background: #c9ccd1; }
.d-best { background: var(--good); }
.d-worst { background: var(--bad); }
.d-guide { background: none; border-radius: 0; width: 0; height: 12px; border-left: 2px dotted #aeb2b8; margin-right: 8px; vertical-align: -2px; }
.d-on { background: var(--accent); border-radius: 3px; }
.d-off { background: #fff; border: 1px solid #c9ccd1; border-radius: 3px; width: 11px; height: 11px; }
.d-reach { background: linear-gradient(#f2a766, #fbe3cf); border-radius: 3px; }
.fk-axis { font-size: 11px; fill: #80868b; font-family: 'Inter', sans-serif; }
.fk-axis.strong { fill: #5f6368; font-weight: 500; }
.fk-lbl { font-size: 11.5px; font-family: 'Inter', sans-serif; font-weight: 600; paint-order: stroke; stroke: #fff; stroke-width: 4px; stroke-linejoin: round; }
.fk-badge { font-size: 9.5px; font-family: 'Inter', sans-serif; font-weight: 700; fill: var(--accent); }
.cell { fill: #fff; fill-opacity: 0.8; stroke: #d5d8dc; stroke-width: 1; transition: fill 0.35s ease, stroke 0.35s ease, transform 0.35s ease; transform-box: fill-box; }
.cell.on { fill: var(--accent); fill-opacity: 1; stroke: var(--accent); transform: translateY(-4px); }

/* results explorer */
.tabs { display: flex; flex-wrap: wrap; gap: 0.4rem; justify-content: center; margin-bottom: 0.7rem; }
.tab {
  font: inherit; font-size: 0.88rem; font-weight: 600; min-height: 40px;
  padding: 0.4rem 1rem; border: 1px solid var(--line); border-radius: 999px;
  background: var(--panel); color: var(--muted); cursor: pointer;
}
.tab[aria-selected=true] { background: #202124; color: #fff; border-color: #202124; }
.explorer-bar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem; align-items: center; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.4rem; }
.explorer-bar label { cursor: pointer; display: inline-flex; align-items: center; gap: 0.4rem; min-height: 32px; }
.results th.sortable { cursor: pointer; user-select: none; }
.results th.sortable:hover { background: var(--panel); }
.results th .arr { display: inline-block; width: 0.9em; color: var(--accent); }
.more-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.more h4 { margin: 0 0 0.3rem; font-size: 0.95rem; }
@media (max-width: 860px) { .more-grid { grid-template-columns: 1fr; } }

.widget-intro { text-align: center; }