:root {
  color-scheme: light only;
  --bg: #fbf7f7;
  --bg-elev: #ffffff;
  --bg-elev-2: #f4eced;
  --border: #ecd9dc;
  --text: #1a0e10;
  --muted: #6b545a;
  --accent: #e0223a;
  --accent-2: #b3122a;
  --code-bg: #fff5f6;
  --max-w: 1200px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,0.85);
  border-bottom: 1px solid var(--border);
}
.site-header .inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; max-width: var(--max-w); margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.brand .dot { width: 10px; height: 10px; background: var(--accent); border-radius: 50%; box-shadow: 0 0 12px var(--accent); }
.nav a { color: var(--muted); margin-left: 22px; font-size: 14px; }
.nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  padding: 80px 0 56px;
  text-align: center;
  background:
    radial-gradient(700px 400px at 50% -100px, rgba(224,34,58,0.18), transparent 60%),
    radial-gradient(900px 500px at 80% 20%, rgba(224,34,58,0.08), transparent 70%);
}
.hero h1 {
  font-size: clamp(36px, 5vw, 56px);
  margin: 0 0 14px; letter-spacing: -0.02em; line-height: 1.05;
}
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead {
  font-size: 18px; color: var(--muted); max-width: 780px; margin: 0 auto 24px;
}
.badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 16px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 999px;
  background: var(--bg-elev); border: 1px solid var(--border);
  color: var(--text); font-size: 13px; font-weight: 500;
}
.badge:hover { border-color: var(--accent); text-decoration: none; }
.badge.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.badge.primary:hover { background: #f23a52; border-color: #f23a52; }

/* Section */
section { padding: 64px 0; border-top: 1px solid var(--border); }
section h2 {
  font-size: 28px; margin: 0 0 8px; letter-spacing: -0.01em;
}
section .sub { color: var(--muted); margin: 0 0 28px; }

/* Paper */
.paper-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 14px;
  padding: 28px; display: grid; grid-template-columns: 1fr; gap: 16px;
}
.paper-card .meta { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-size: 12px; padding: 4px 10px; border-radius: 999px; background: var(--bg-elev-2); border: 1px solid var(--border); color: var(--muted); }
.paper-card h3 { margin: 0; font-size: 22px; }
.paper-card .authors { color: var(--muted); }
.paper-card .actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px; border-radius: 8px;
  background: var(--bg-elev-2); border: 1px solid var(--border); color: var(--text);
  font-size: 14px; cursor: pointer;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn.primary:hover { background: #f23a52; border-color: #f23a52; }

pre.bibtex {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; overflow: auto; font-size: 12.5px;
}

/* Explorer */
.controls {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 22px;
}
.controls .group { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  padding: 7px 14px; border-radius: 999px; cursor: pointer;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  font-size: 13px; user-select: none;
}
.chip:hover { border-color: var(--accent); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.controls input[type="search"] {
  flex: 1; min-width: 220px;
  padding: 9px 14px; border-radius: 8px;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  font-size: 14px; outline: none;
}
.controls input[type="search"]:focus { border-color: var(--accent); }

.cat-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}
.cat {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px; cursor: pointer; transition: transform .15s, border-color .15s;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.cat:hover { border-color: var(--accent); transform: translateY(-2px); }
.cat .name { font-weight: 600; text-transform: capitalize; }
.cat .scene { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }

/* Variant grid (inside category) */
.cat-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; gap: 12px;
}
.back-btn { background: transparent; border: none; color: var(--accent-2); cursor: pointer; font-size: 14px; padding: 0; }
.back-btn:hover { text-decoration: underline; }

.variant-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.variant {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; cursor: pointer; transition: transform .15s, border-color .15s;
}
.variant:hover { transform: translateY(-3px); border-color: var(--accent); }
.variant .img-wrap {
  aspect-ratio: 1 / 1; background: #fff;
  display: flex; align-items: center; justify-content: center;
}
.variant img, .variant model-viewer {
  width: 100%; height: 100%; object-fit: cover; display: block; background: #fff;
  --poster-color: transparent;
}
.variant .meta { padding: 10px 12px; font-size: 13px; color: var(--muted); display: flex; justify-content: space-between; }
.variant .meta strong { color: var(--text); }

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  display: none; align-items: center; justify-content: center; z-index: 100;
  padding: 24px;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 14px;
  width: 100%; max-width: 1100px; max-height: 92vh; overflow: hidden;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}
.modal .left { padding: 20px; border-right: 1px solid var(--border); overflow: auto; max-height: 92vh; }
.modal .right { padding: 20px; overflow: auto; max-height: 92vh; }
.modal .mesh-zoom {
  width: 100%; aspect-ratio: 1/1; background: #fff;
  border-radius: 10px; overflow: hidden;
}
.modal .mesh-zoom model-viewer { width: 100%; height: 100%; --poster-color: transparent; }
.modal .img-still {
  width: 100%; aspect-ratio: 1/1; background: #fff;
  border-radius: 10px; overflow: hidden;
}
.modal .img-still img { width: 100%; height: 100%; object-fit: contain; display: block; }
.modal .title { font-size: 18px; font-weight: 700; margin: 0 0 6px; text-transform: capitalize; }
.modal .desc { color: var(--text); margin: 0 0 14px; }
.modal .row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.modal h4 { margin: 0 0 8px; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.modal pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px; overflow: auto; font-size: 12.5px; margin: 0;
  max-height: 60vh;
}
.modal .close-x {
  position: absolute; top: 18px; right: 22px;
  background: transparent; border: none; color: var(--muted); font-size: 22px;
  cursor: pointer; z-index: 110;
}
.modal .close-x:hover { color: var(--text); }
@media (max-width: 760px) {
  .modal { grid-template-columns: 1fr; }
  .modal .left { border-right: none; border-bottom: 1px solid var(--border); max-height: none; }
  .modal .right { max-height: none; }
}

.loading { color: var(--muted); font-style: italic; padding: 8px 0; }

/* Marquee — infinite scrolling rotating gallery */
.marquee {
  position: relative;
  margin: 0 -24px 32px;
  padding: 12px 0;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent 0%, #000 6%, #000 94%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, #000 6%, #000 94%, transparent 100%);
}
.marquee-row { display: flex; overflow: hidden; padding: 10px 0; }
.marquee-track {
  display: flex; gap: 18px;
  width: max-content;
  animation: scroll-left 140s linear infinite;
}
.marquee-row.reverse .marquee-track { animation-name: scroll-right; animation-duration: 160s; }
.marquee-row:hover .marquee-track { animation-play-state: paused; }
@keyframes scroll-left  { from { transform: translateX(0); }       to { transform: translateX(-50%); } }
@keyframes scroll-right { from { transform: translateX(-50%); }    to { transform: translateX(0); } }

.m-card {
  flex: 0 0 auto;
  width: 180px; height: 180px;
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden; cursor: pointer;
  perspective: 800px;
  position: relative;
  transition: border-color .2s, transform .2s;
}
.m-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.m-card model-viewer, .m-card img {
  width: 100%; height: 100%; display: block; background: #fff;
  --poster-color: transparent;
}
.m-card .label {
  position: absolute; left: 8px; bottom: 8px;
  font-size: 11px; padding: 3px 8px; border-radius: 999px;
  background: rgba(20,4,7,0.78); color: #fff; text-transform: capitalize;
  letter-spacing: 0.02em;
}

/* arXiv embedded preview */
.paper-preview {
  margin-top: 18px;
  border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; background: var(--bg-elev-2);
}
.paper-preview iframe {
  width: 100%; height: 760px; border: 0; background: #fff;
}
.paper-preview .pp-fallback {
  padding: 22px; color: var(--muted); text-align: center;
}
.paper-preview .pp-fallback a { color: var(--accent-2); }

/* Authors block */
.authors-grid {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin: 14px 0 4px;
}
.author {
  background: var(--bg-elev-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px;
}
.author .a-name { font-weight: 600; }
.author .a-aff { color: var(--muted); font-size: 13px; margin-top: 2px; }

/* Video section */
.video-card {
  border: 1px solid var(--border); border-radius: 14px;
  overflow: hidden; background: #000; position: relative;
  aspect-ratio: 16/9;
}
.video-card video, .video-card iframe {
  width: 100%; height: 100%; display: block; border: 0;
}
.video-placeholder {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%; color: var(--muted);
  background:
    radial-gradient(600px 300px at 50% 30%, rgba(224,34,58,0.10), transparent 60%),
    var(--bg-elev-2);
  flex-direction: column; gap: 10px; padding: 24px; text-align: center;
}
.video-placeholder .vp-title { color: var(--text); font-weight: 600; }
.video-placeholder code {
  background: var(--code-bg); border: 1px solid var(--border);
  padding: 2px 8px; border-radius: 6px; font-size: 12px;
}

/* Footer */
footer {
  padding: 40px 0 60px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px; text-align: center;
}