/* ============================================================
   LIST3R project page
   Single white theme.
   ============================================================ */
:root {
  --maxw: 1180px;
  --radius: 16px;
  --shadow: 0 8px 30px rgba(0,0,0,.10);
  --shadow-lg: 0 18px 50px rgba(0,0,0,.16);
  --gap: 22px;
  --t: .35s cubic-bezier(.4,0,.2,1);
  --mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --bg: #ffffff;
  --bg2: #ffffff;
  --panel: #ffffff;
  --panel2: #f5f7fa;
  --text: #16203a;
  --muted: #5d6b8c;
  --line: rgba(20,30,60,.10);
  --brand: #3563e9;
  --brand2: #8b46e6;
  --accent: #11b3a0;
  --hero-grad: none;
  --canvas-bg: #f5f7fa;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background var(--t), color var(--t);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- Nav ---------- */
nav.top {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
nav.top .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 22px;
  display: flex; align-items: center; gap: 18px;
}
nav.top .logo { font-weight: 800; letter-spacing: .5px; font-size: 1.05rem; }
nav.top .logo .dot { color: var(--brand); }
nav.top .links { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
nav.top .links a {
  color: var(--muted); padding: 6px 11px; border-radius: 9px;
  font-size: .9rem; font-weight: 600; transition: var(--t);
}
nav.top .links a:hover { color: var(--text); background: var(--panel2); text-decoration: none; }

/* ---------- Hero ---------- */
header.hero {
  position: relative; overflow: hidden;
  background: var(--hero-grad), var(--bg);
  padding: 64px 0 36px;
}
.hero h1 {
  font-size: clamp(2.3rem, 5.5vw, 4rem); line-height: 1.05; margin: 0 0 6px;
  font-weight: 850; letter-spacing: -1px;
}

/* ---------- Global centered layout ---------- */
.hero .wrap, section .wrap, footer .wrap { text-align: center; }
.hero h1, .hero .sub { text-align: center; }
.badges { justify-content: center; }
.eyebrow { text-align: center; }
h2.sec-title { text-align: center; }
.lead { margin-left: auto; margin-right: auto; text-align: center; }
.abstract-box { text-align: center; }
.tt-toolbar { justify-content: center; }
/* tables stay left-aligned in first column for readability, but block centered */
.table-wrap { margin-left: auto; margin-right: auto; }
.cite-box { text-align: left; }
.hero h1 .grad {
  background: linear-gradient(100deg, var(--brand), var(--brand2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub {
  font-size: clamp(1.05rem, 2.2vw, 1.4rem); color: var(--text);
  font-weight: 600; margin: 0 0 18px; opacity: .95;
}
.hero .authors { color: var(--muted); font-size: 1rem; margin-bottom: 4px; }
.hero .affil { color: var(--muted); font-size: .9rem; margin-bottom: 22px; }
.badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px; font-weight: 700; font-size: .92rem;
  background: var(--panel); border: 1px solid var(--line); color: var(--text);
  transition: var(--t);
}
.badge:hover { transform: translateY(-2px); box-shadow: var(--shadow); text-decoration: none; }
.badge.primary { background: linear-gradient(100deg, var(--brand), var(--brand2)); color: #fff; border: none; }

.teaser-fig {
  margin-top: 12px; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); box-shadow: var(--shadow-lg); background: #fff;
}
.teaser-fig img { width: 100%; display: block; background: #fff; }
.teaser-cap { padding: 14px 18px; color: var(--muted); font-size: .92rem; background: var(--panel); }

/* ---------- Sections ---------- */
section { padding: 60px 0; border-top: 1px solid var(--line); }
.eyebrow {
  text-transform: uppercase; letter-spacing: 2px; font-size: .78rem;
  font-weight: 800; color: var(--brand); margin-bottom: 10px;
}
.eyebrow .num { color: var(--muted); margin-right: 8px; }
h2.sec-title { font-size: clamp(1.6rem, 3.4vw, 2.4rem); margin: 0 0 14px; font-weight: 800; letter-spacing: -.5px; }
.lead { font-size: 1.08rem; color: var(--muted); max-width: 820px; margin: 0 auto 28px; text-align: center; }
.lead.wide { max-width: 100%; }
p { color: var(--text); }
.muted { color: var(--muted); }

/* abstract */
.abstract-box {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 30px; box-shadow: var(--shadow); font-size: 1.05rem;
}

/* contribution cards */
.cards { display: grid; grid-template-columns: repeat(3,1fr); gap: var(--gap); }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: var(--t); position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--brand) 40%, var(--line)); }
.card .ic {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  font-size: 1.3rem; margin-bottom: 14px;
  background: linear-gradient(135deg, color-mix(in srgb,var(--brand) 30%, transparent), color-mix(in srgb,var(--brand2) 30%, transparent));
}
.card h3 { margin: 0 0 8px; font-size: 1.12rem; }
.card p { color: var(--muted); font-size: .96rem; margin: 0; }

/* figure block */
.figure {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); margin-bottom: 20px;
}
.figure img { width: 100%; display: block; cursor: zoom-in; background: #fff; }
.figure figcaption { padding: 14px 20px; color: var(--muted); font-size: .92rem; background: var(--panel); }
.figure figcaption b { color: var(--text); }

/* pipeline steps */
.steps { display: grid; grid-template-columns: repeat(3,1fr); gap: var(--gap); margin-top: 26px; }
.step {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px;
  position: relative;
}
.step .n {
  font-family: var(--mono); font-size: 2.2rem; font-weight: 800;
  background: linear-gradient(100deg, var(--brand), var(--brand2));
  -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1;
}
.step h4 { margin: 8px 0 8px; font-size: 1.05rem; }
.step p { color: var(--muted); font-size: .93rem; margin: 0; }

/* ---------- Turntable comparison ---------- */
.tt-toolbar {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: center;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; margin-bottom: 20px;
}
.tt-toolbar .group { display: flex; align-items: center; gap: 10px; }
.tt-toolbar label { font-size: .85rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }
.scene-tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.scene-tabs button {
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--panel2); color: var(--muted); cursor: pointer; font-weight: 700;
  font-size: .88rem; transition: var(--t);
}
.scene-tabs button:hover { color: var(--text); }
.scene-tabs button.active { background: linear-gradient(100deg,var(--brand),var(--brand2)); color: #fff; border-color: transparent; }

.tt-controls { display: flex; align-items: center; gap: 14px; margin-left: auto; }
.btn {
  padding: 8px 16px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel2); color: var(--text); cursor: pointer; font-weight: 700; font-size: .9rem;
  transition: var(--t); display: inline-flex; align-items: center; gap: 7px;
}
.btn:hover { border-color: var(--brand); }
.btn.play.on { background: linear-gradient(100deg,var(--brand),var(--brand2)); color: #fff; border-color: transparent; }
input[type=range] { accent-color: var(--brand); cursor: pointer; }

/* 4 baselines in a 2x2 block (left) + LIST3R spanning a double-width,
   double-height cell (right) so Ours gets ~2 baselines' worth of space. */
.viewer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 1fr;
  gap: var(--gap);
}
.viewer { background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; position: relative; aspect-ratio: 1/1; cursor: grab; }
/* baselines: 2x2 block in columns 1-2 */
.viewer-grid .viewer:nth-child(1) { grid-column: 1; grid-row: 1; }
.viewer-grid .viewer:nth-child(2) { grid-column: 2; grid-row: 1; }
.viewer-grid .viewer:nth-child(3) { grid-column: 1; grid-row: 2; }
.viewer-grid .viewer:nth-child(4) { grid-column: 2; grid-row: 2; }
.viewer.ours {
  border: 2px solid var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb,var(--brand) 22%, transparent);
  grid-column: 3 / 5; grid-row: 1 / 3; aspect-ratio: 1/1;
}
.viewer:active { cursor: grabbing; }
.viewer img { width: 100%; height: 100%; object-fit: contain; display: block; user-select: none; -webkit-user-drag: none; }
.viewer .tag {
  position: absolute; top: 10px; left: 10px; z-index: 3;
  padding: 5px 12px; border-radius: 999px; font-weight: 800; font-size: .82rem;
  background: color-mix(in srgb, var(--bg) 70%, transparent); color: var(--text);
  border: 1px solid var(--line); backdrop-filter: blur(6px);
}
.viewer.ours .tag { background: linear-gradient(100deg,var(--brand),var(--brand2)); color:#fff; border: none; }
.viewer .tag .star { margin-left: 4px; }
.viewer .hint {
  position: absolute; bottom: 10px; left: 0; right: 0; text-align: center;
  font-size: .76rem; color: var(--muted); opacity: 0; transition: var(--t); pointer-events: none;
}
.viewer:hover .hint { opacity: 1; }
.tt-note { margin-top: 16px; color: var(--muted); font-size: .9rem; }
.tt-loading { padding: 50px; text-align: center; color: var(--muted); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow); }
table.metrics { width: 100%; border-collapse: collapse; background: var(--panel); font-size: .92rem; min-width: 720px; }
table.metrics th, table.metrics td { padding: 11px 13px; text-align: center; border-bottom: 1px solid var(--line); }
table.metrics thead th { background: var(--panel2); font-weight: 800; color: var(--text); position: sticky; top: 0; }
table.metrics td:first-child, table.metrics th:first-child { text-align: left; font-weight: 700; }
table.metrics tr.ours { background: color-mix(in srgb, var(--brand) 12%, transparent); }
table.metrics tr.ours td { font-weight: 800; }
table.metrics .best { color: var(--accent); font-weight: 800; }
table.metrics .grp { font-size: .76rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.tbl-cap { color: var(--muted); font-size: .9rem; margin: 12px 2px 0; }

/* gallery */
.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); }

/* lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 100; background: rgba(0,0,0,.9);
  display: none; align-items: center; justify-content: center; padding: 30px; cursor: zoom-out;
}
.lightbox.on { display: flex; }
.lightbox img { max-width: 96vw; max-height: 92vh; border-radius: 10px; background: #fff; }

/* footer */
footer { padding: 46px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
.cite-box {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; font-family: var(--mono); font-size: .82rem; color: var(--muted);
  white-space: pre-wrap; overflow-x: auto; position: relative;
}
.cite-box button {
  position: absolute; top: 12px; right: 12px; padding: 5px 11px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--panel2); color: var(--text); cursor: pointer; font-size: .78rem;
}

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s, transform .6s; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .cards, .steps { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .tt-controls { margin-left: 0; width: 100%; }
  nav.top .links { display: none; }
  /* stack viewers in 2 columns; reset explicit placement */
  .viewer-grid { grid-template-columns: 1fr 1fr; }
  .viewer-grid .viewer:nth-child(1),
  .viewer-grid .viewer:nth-child(2),
  .viewer-grid .viewer:nth-child(3),
  .viewer-grid .viewer:nth-child(4),
  .viewer.ours { grid-column: auto; grid-row: auto; }
  .viewer.ours { grid-column: span 2; aspect-ratio: 16/10; }
}
@media (max-width: 620px) {
  .viewer-grid { grid-template-columns: 1fr; }
  .viewer.ours { grid-column: auto; aspect-ratio: 1/1; }
}