/* GenFirst project page — layout in the spirit of the Cola DLM / Nerfies pages. */

:root {
  --ink: #14181f;
  --ink-soft: #4a5361;
  --ink-faint: #7b8492;
  --line: #e4e7ec;
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --bg-tint: #fbf7f4;
  --accent: #d9542f;
  --accent-dark: #b23f1f;
  --accent-soft: #fdeee7;
  --good: #17864f;
  --good-soft: #e8f6ee;
  --bad: #c23b3b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 31, .05), 0 10px 30px rgba(20, 24, 31, .06);
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

code, .mono { font-family: "Fira Code", ui-monospace, SFMono-Regular, Menlo, monospace; }

/* ---------- sticky nav ---------- */
.topnav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topnav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: .5rem 1.25rem;
  display: flex; align-items: center; gap: 1.25rem;
}
.brand {
  display: flex; align-items: center; gap: .55rem;
  font-weight: 800; letter-spacing: -.01em; color: var(--ink); font-size: 1.05rem;
}
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #f0a06a);
  display: grid; place-items: center; color: #fff; font-size: .72rem; font-weight: 800;
}
.topnav nav { margin-left: auto; display: flex; gap: .15rem; flex-wrap: wrap; }
.topnav nav a {
  color: var(--ink-soft); font-size: .86rem; font-weight: 500;
  padding: .4rem .6rem; border-radius: 8px;
}
.topnav nav a:hover { background: var(--bg-soft); color: var(--ink); text-decoration: none; }
.topnav nav a.is-cta {
  background: var(--ink); color: #fff; font-weight: 600;
}
.topnav nav a.is-cta:hover { background: var(--accent-dark); }

/* ---------- hero ---------- */
.hero {
  padding: 3.4rem 1.25rem 2.4rem;
  background:
    radial-gradient(900px 320px at 18% -8%, var(--accent-soft), transparent 70%),
    radial-gradient(700px 300px at 88% 0%, #eef4ff, transparent 72%);
  border-bottom: 1px solid var(--line);
}
.hero-inner { max-width: 980px; margin: 0 auto; text-align: center; }
.publication-title {
  font-size: clamp(2rem, 4.4vw, 3.05rem);
  line-height: 1.14; letter-spacing: -.025em; font-weight: 800; margin: 0 0 .2rem;
}
.publication-title .accent { color: var(--accent); }
.subtitle {
  font-size: clamp(1rem, 1.6vw, 1.22rem); font-weight: 600;
  color: var(--ink-soft); margin: .1rem auto .9rem; max-width: 900px;
  text-wrap: balance;
}
/* The title fits on one line on desktop; narrow screens break it at the clause. */
.subtitle .hero-br { display: none; }
@media (max-width: 700px) {
  .subtitle .hero-br { display: inline; }
}
.tagline {
  color: var(--ink-soft); font-size: 1rem; max-width: 720px; margin: 0 auto 1.5rem;
}
.tagline b { color: var(--ink); font-weight: 600; }
.authors { font-size: .98rem; margin: 0 auto .35rem; max-width: 840px; }
.author { white-space: nowrap; margin: 0 .18rem; }
.sup { color: var(--accent); font-size: .72em; vertical-align: super; }
.affil-list { color: var(--ink-soft); font-size: .92rem; margin-bottom: .3rem; }
.affil-item { margin: 0 .5rem; white-space: nowrap; }
.notes { color: var(--ink-faint); font-size: .82rem; }
.team-badge {
  display: inline-flex; align-items: center; gap: .5rem; margin-top: 1rem;
  padding: .3rem .85rem; border-radius: 999px;
  background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow);
  font-size: .82rem; font-weight: 600; color: var(--ink-soft);
}
.publication-links { display: flex; justify-content: center; flex-wrap: wrap; gap: .55rem; margin-top: 1.5rem; }
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .5rem 1.05rem; border-radius: 999px;
  background: var(--ink); color: #fff; font-size: .9rem; font-weight: 600;
  border: 1px solid var(--ink); transition: transform .15s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); background: var(--accent-dark); border-color: var(--accent-dark); }
.btn.is-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn.is-ghost:hover { background: var(--bg-soft); color: var(--ink); border-color: var(--ink-faint); }
.btn[aria-disabled="true"] { opacity: .55; pointer-events: none; }
/* Status of a link that does not exist yet, kept lighter than the label itself. */
.btn .btn-note { font-weight: 500; font-size: .78rem; opacity: .75; }

.headline-stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .8rem; max-width: 940px; margin: 2.2rem auto 0;
}
.stat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: .85rem .7rem; box-shadow: var(--shadow);
}
.stat .num {
  display: block; font-size: 1.6rem; font-weight: 800; letter-spacing: -.02em;
  color: var(--accent); line-height: 1.2;
}
.stat .lbl { display: block; font-size: .78rem; color: var(--ink-soft); line-height: 1.4; }

/* ---------- sections ---------- */
.section { padding: 3.4rem 1.25rem; }
.section.is-soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section.is-tight { padding-top: 2rem; }
.container { max-width: var(--maxw); margin: 0 auto; }
.container.narrow { max-width: 860px; }

.section-heading { text-align: center; margin-bottom: 1.8rem; }
.eyebrow {
  display: inline-block; font-size: .74rem; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent);
  background: var(--accent-soft); padding: .25rem .7rem; border-radius: 999px;
}
.section-heading h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem); letter-spacing: -.02em;
  margin: .8rem 0 .4rem; font-weight: 800;
}
.section-heading .lead { color: var(--ink-soft); max-width: 780px; margin: 0 auto; font-size: 1rem; }

.abstract-block { font-size: 1.02rem; }
.abstract-block p { margin: 0 0 1rem; }
.abstract-block strong { font-weight: 700; }

/* ---------- figures ---------- */
.paper-figure { margin: 0 0 1.4rem; }
.paper-figure img {
  width: 100%; display: block; border-radius: 10px;
  border: 1px solid var(--line); background: #fff;
}
.paper-figure figcaption {
  font-size: .86rem; color: var(--ink-soft); margin-top: .6rem; line-height: 1.6;
}
.paper-figure figcaption b { color: var(--ink); }
/* Single-panel diagrams look oversized when stretched across the full column. */
.paper-figure.is-narrow img { max-width: 820px; margin-inline: auto; }
.figure-grid { display: grid; gap: 1.4rem; }
.figure-grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.figure-grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.zoomable { cursor: zoom-in; }

/* ---------- cards ---------- */
.card-grid { display: grid; gap: 1.1rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.3rem 1.4rem; box-shadow: var(--shadow);
}
.card h3 { margin: .5rem 0 .5rem; font-size: 1.12rem; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.card p + p { margin-top: .7rem; }
.tag {
  display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-faint);
}
.tag.is-accent { color: var(--accent); }
.takeaway {
  margin-top: .9rem; padding: .7rem .9rem; border-radius: 10px;
  background: var(--good-soft); border-left: 3px solid var(--good);
  font-size: .92rem; color: #14603b;
}
.takeaway b { color: #0d4a2c; }

.stage-grid { display: grid; gap: 1.1rem; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 1.4rem; }
.stage { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem 1.3rem; box-shadow: var(--shadow); }
.stage-tag {
  display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: #fff; background: var(--accent); padding: .12rem .55rem; border-radius: 6px;
}
.stage h4 { margin: .7rem 0 .45rem; font-size: 1.02rem; }
.stage p { margin: 0; font-size: .92rem; color: var(--ink-soft); }

.eq-block {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.1rem 1.2rem; margin: 1.2rem 0; box-shadow: var(--shadow); overflow-x: auto;
}
.eq-block .eq-note { font-size: .86rem; color: var(--ink-soft); margin: .6rem 0 0; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }
table.data-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
table.data-table caption {
  caption-side: top; text-align: left; padding: .9rem 1.1rem .2rem;
  font-size: .88rem; color: var(--ink-soft);
}
table.data-table caption b { color: var(--ink); }
table.data-table th, table.data-table td { padding: .45rem .7rem; text-align: right; white-space: nowrap; }
table.data-table th:first-child, table.data-table td:first-child { text-align: left; }
table.data-table thead th {
  font-size: .78rem; text-transform: none; color: var(--ink-soft); font-weight: 600;
  border-bottom: 1px solid var(--ink); background: var(--bg-soft);
}
table.data-table tbody tr + tr td { border-top: 1px solid var(--line); }
table.data-table tbody tr:hover td { background: #fcfcfd; }
table.data-table .group td {
  background: var(--bg-soft); font-weight: 700; font-size: .8rem; letter-spacing: .04em;
  text-transform: uppercase; color: var(--ink-faint); text-align: left;
}
table.data-table tr.ours td { background: var(--accent-soft) !important; font-weight: 600; }
table.data-table .best { font-weight: 800; color: var(--accent-dark); }
table.data-table .collapsed { color: var(--bad); font-style: italic; text-align: center; }
.table-note { font-size: .82rem; color: var(--ink-faint); margin: .6rem 0 0; }

/* ---------- expandables ---------- */
details.detail-block {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: .9rem; box-shadow: var(--shadow); overflow: hidden;
}
details.detail-block > summary {
  cursor: pointer; list-style: none; padding: .95rem 1.2rem;
  font-weight: 600; font-size: .98rem; display: flex; align-items: center; gap: .6rem;
}
details.detail-block > summary::-webkit-details-marker { display: none; }
details.detail-block > summary::after {
  content: "+"; margin-left: auto; color: var(--accent); font-weight: 700; font-size: 1.15rem;
}
details.detail-block[open] > summary::after { content: "–"; }
details.detail-block[open] > summary { border-bottom: 1px solid var(--line); }
.detail-body { padding: 1.2rem; }
.detail-body > :first-child { margin-top: 0; }
.detail-body > :last-child { margin-bottom: 0; }

/* ---------- t2i comparison ---------- */
.compare-toolbar {
  display: flex; align-items: center; justify-content: center; gap: .8rem;
  flex-wrap: wrap; margin-bottom: 1.4rem; font-size: .88rem; color: var(--ink-soft);
}
.switch {
  display: inline-flex; background: #fff; border: 1px solid var(--line);
  border-radius: 999px; padding: .18rem; box-shadow: var(--shadow);
}
.switch button {
  border: 0; background: transparent; cursor: pointer; font: inherit; font-weight: 600;
  padding: .34rem .95rem; border-radius: 999px; color: var(--ink-soft);
}
.switch button.is-on { background: var(--ink); color: #fff; }
.compare-grid { display: grid; gap: 1rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.compare-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
}
.compare-card .frame { position: relative; aspect-ratio: 1 / 1; background: #f2f2f4; cursor: zoom-in; }
.compare-card .frame img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: opacity .18s ease;
}
.compare-card .frame img.is-hidden { opacity: 0; }
.compare-card .pill {
  position: absolute; left: .5rem; top: .5rem; z-index: 3;
  font-size: .7rem; font-weight: 700; letter-spacing: .02em;
  padding: .18rem .5rem; border-radius: 999px; color: #fff;
  background: rgba(20, 24, 31, .72); backdrop-filter: blur(4px);
}
.compare-card .pill.is-ours { background: rgba(23, 134, 79, .85); }
.compare-card .prompt {
  padding: .6rem .75rem .75rem; font-size: .8rem; color: var(--ink-soft); line-height: 1.5;
}

/* ---------- galleries ---------- */
.gallery { display: grid; gap: .55rem; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.gallery img {
  width: 100%; display: block; border-radius: 8px; border: 1px solid var(--line);
  cursor: zoom-in; transition: transform .15s ease, box-shadow .15s ease;
}
.gallery img:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.more-btn { display: flex; justify-content: center; margin-top: 1.2rem; }

/* ---------- bibtex ---------- */
.bibtex-block { position: relative; }
.bibtex-block pre {
  margin: 0; padding: 1.2rem 1.3rem; overflow-x: auto;
  background: #14181f; color: #e8ebf0; border-radius: var(--radius);
  font-family: "Fira Code", ui-monospace, monospace; font-size: .84rem; line-height: 1.65;
}
.copy-btn {
  position: absolute; top: .7rem; right: .7rem;
  background: rgba(255, 255, 255, .1); color: #e8ebf0; border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 8px; padding: .25rem .65rem; font: inherit; font-size: .78rem; cursor: pointer;
}
.copy-btn:hover { background: rgba(255, 255, 255, .2); }

/* ---------- footer ---------- */
footer.page-footer {
  padding: 2.4rem 1.25rem 3rem; border-top: 1px solid var(--line);
  text-align: center; color: var(--ink-faint); font-size: .85rem; background: var(--bg-soft);
}
footer.page-footer .affils { font-weight: 600; color: var(--ink-soft); margin-bottom: .5rem; }

/* ---------- lightbox / back-to-top ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 100; display: none;
  background: rgba(12, 14, 18, .92); align-items: center; justify-content: center;
}
.lightbox.is-open { display: flex; }
.lightbox img { max-width: 92vw; max-height: 84vh; border-radius: 10px; }
.lb-btn {
  position: absolute; background: rgba(255, 255, 255, .12); color: #fff;
  border: 1px solid rgba(255, 255, 255, .25); border-radius: 999px;
  width: 42px; height: 42px; font-size: 1.2rem; cursor: pointer;
}
.lb-btn:hover { background: rgba(255, 255, 255, .25); }
.lb-close { top: 1.1rem; right: 1.1rem; }
.lb-prev { left: 1.1rem; top: 50%; transform: translateY(-50%); }
.lb-next { right: 1.1rem; top: 50%; transform: translateY(-50%); }
.lb-counter {
  position: absolute; top: 1.3rem; left: 50%; transform: translateX(-50%);
  color: #cfd4dc; font-size: .82rem; letter-spacing: .04em;
}
.lb-caption {
  position: absolute; bottom: 1.4rem; left: 50%; transform: translateX(-50%);
  color: #d8dce3; font-size: .85rem; max-width: 80vw; text-align: center;
}
.back-to-top {
  position: fixed; right: 1.2rem; bottom: 1.2rem; z-index: 70;
  width: 42px; height: 42px; border-radius: 999px; cursor: pointer;
  background: var(--ink); border: 0; color: #fff; display: none;
  box-shadow: 0 8px 24px rgba(20, 24, 31, .25);
}
.back-to-top.is-shown { display: block; }
.back-to-top svg { width: 20px; height: 20px; fill: none; stroke: #fff; stroke-width: 2.2; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
.reveal.is-in { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: .06s; }
.reveal-delay-2 { transition-delay: .12s; }
.reveal-delay-3 { transition-delay: .18s; }
.reveal-delay-4 { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

.muted { color: var(--ink-soft); }
.center { text-align: center; }
.tiny { font-size: .82rem; }
.mt-2 { margin-top: 1.2rem; }
.mt-3 { margin-top: 2rem; }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .headline-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stage-grid { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .topnav nav { display: none; }
  .card-grid, .figure-grid.cols-2, .figure-grid.cols-3 { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section { padding: 2.4rem 1rem; }
}