/* CoLa3D project page. */
:root {
  --paper:      #f6f7f9;
  --paper-2:    #ebeef3;
  --ink:        #0f1419;
  --ink-2:      #2a3340;
  --ink-3:      #6b7686;
  --rule:       #d6dbe3;
  --accent:     #2e4dd4;
  --accent-2:   #5470e6;
  --accent-soft:#dbe2fa;
  --code-bg:    #0f1419;
  --code-fg:    #e8ecf2;

  --serif:  "Crimson Pro", "Source Serif Pro", Georgia, serif;
  --sans:   "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --mono:   "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw:   980px;
  --maxw-wide: 1140px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(15,20,25,.05) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
  z-index: 0;
  opacity: .5;
}

body > * { position: relative; z-index: 1; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

::selection { background: var(--accent); color: var(--paper); }

.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 88px 32px 36px;
  text-align: center;
}

.venue-tag {
  display: block;
  margin: 28px 0 32px;
  padding: 0;
  border: 0;
  border-radius: 0;
  font-family: var(--sans);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.035em;
  text-transform: none;
  text-align: center;
  color: var(--accent);
}

.title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 22px;
  color: var(--ink);
  text-wrap: balance;
}
.title-mark {
  color: var(--accent);
  font-style: italic;
  margin-right: .15em;
}

.authors {
  font-size: 17px;
  color: var(--ink-2);
  margin-bottom: 6px;
  text-wrap: balance;
}
.authors .sep { color: var(--ink-3); margin: 0 .35em; }
.authors sup { color: var(--accent); font-size: .7em; }
.authors .author a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .15s, border-color .15s;
}
.authors .author a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.affil {
  font-size: 14px;
  color: var(--ink-3);
  margin-bottom: 28px;
}
.affil sup { color: var(--accent); }

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 32px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px 9px 14px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  transition: transform .15s ease, background .15s ease;
}
.badge:hover { transform: translateY(-1px); background: var(--accent); text-decoration: none; }
.badge-icon { display: inline-flex; }

.tldr {
  display: flex;
  align-items: baseline;
  gap: 14px;
  max-width: 740px;
  margin: 8px auto 0;
  padding: 18px 22px;
  border-left: 3px solid var(--accent);
  background: rgba(255,255,255,.45);
  text-align: left;
}
.tldr-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}
.tldr-text {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.45;
  color: var(--ink);
}

.teaser {
  max-width: var(--maxw-wide);
  margin: 56px auto 24px;
  padding: 0 32px;
}

.teaser-figure { margin: 0; }


.section-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 30px;
  letter-spacing: -.01em;
  color: var(--ink);
  margin: 0 0 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 56px; height: 2px;
  background: var(--accent);
}
.section-lead {
  font-size: 15px;
  color: var(--ink-3);
  margin: -8px 0 28px;
}

.results {
  max-width: var(--maxw-wide);
  margin: 56px auto;
  padding: 0 32px;
}

.viewer-shell {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 18px;
}

.viewer-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(ellipse at 50% 110%, #1d2330 0%, #0c1018 80%);
  border-radius: 4px;
  overflow: hidden;
}
.viewer-stage canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.viewer-hud {
  position: absolute; inset: 0;
  pointer-events: none;
  padding: 14px;
}
.hud-corner {
  position: absolute;
  display: flex; gap: 6px;
  pointer-events: auto;
}
.hud-corner.tl { top: 14px; left: 14px; }
.hud-corner.tr { top: 14px; right: 14px; }
.hud-corner.bl { bottom: 14px; left: 14px; }
.hud-corner.br { bottom: 14px; right: 14px; }

.hud-pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  background: rgba(246,247,249,.94);
  color: var(--ink);
  padding: 6px 12px;
  border-radius: 999px;
}
.hud-dot {
  width: 7px; height: 7px;
  background: var(--accent-2);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(46,77,212,.25);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; }
  50%     { opacity: .4; }
}

.hud-btn {
  width: 30px; height: 30px;
  background: rgba(246,247,249,.94);
  color: var(--ink);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .15s;
}
.hud-btn:hover { background: var(--accent); color: var(--paper); }
.hud-btn.active { background: var(--accent); color: var(--paper); }

.hud-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(232,236,242,.55);
}
.inst-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.inst-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  cursor: pointer;
  transition: all .15s ease;
}
.inst-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.inst-btn.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.inst-btn .swatch {
  width: 10px; height: 10px;
  border-radius: 2px;
  background: currentColor;
}
.inst-btn.show-all {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
  margin-left: auto;
}
.inst-btn.show-all:hover { background: var(--accent-2); }
.case-carousel {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px dashed var(--rule);
}
.case-nav {
  width: 38px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-2);
  transition: all .15s;
  flex-shrink: 0;
}
.case-nav:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.case-track {
  display: flex;
  gap: 10px;
  flex: 1;
  overflow-x: auto;
  scroll-behavior: smooth;
  scrollbar-width: thin;
}
.case-track::-webkit-scrollbar { height: 6px; }
.case-track::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 3px; }

.case-tile {
  flex: 0 0 144px;
  aspect-ratio: 1 / 1;
  position: relative;
  border: 1.5px solid var(--rule);
  border-radius: 6px;
  background: var(--paper);
  cursor: pointer;
  overflow: hidden;
  transition: all .15s;
}
.case-tile:hover { border-color: var(--ink-2); transform: translateY(-1px); }
.case-tile.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.case-tile .case-thumb {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 22px;
  color: var(--ink-3);
}
.case-tile .case-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.compare { max-width: var(--maxw-wide); margin: 56px auto; padding: 0 32px; }
.hud-btn.labeled {
  width: auto;
  height: 28px;
  padding: 0 10px 0 8px;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  border-radius: 999px;
}
.hud-btn.labeled span { display: inline-block; }
.downstream { max-width: var(--maxw-wide); margin: 56px auto; padding: 0 32px; }

.gallery {
  position: relative;
  width: 100%;
  height: clamp(360px, 48vw, 560px);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-stage {
  position: relative;
  width: 100%;
  height: 100%;
}

.gallery-slide {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 62%;
  aspect-ratio: 16 / 9;
  transform: translate(-50%, -50%) scale(0.74);
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: transform .55s cubic-bezier(.2,.7,.2,1),
              opacity .4s ease,
              filter .4s ease,
              box-shadow .4s ease;
  filter: saturate(.6) brightness(.85);
  opacity: .55;
  z-index: 1;
}
.gallery-slide.left   { transform: translate(calc(-50% - 38%), -50%) scale(0.74); }
.gallery-slide.right  { transform: translate(calc(-50% + 38%), -50%) scale(0.74); }
.gallery-slide.center {
  transform: translate(-50%, -50%) scale(1);
  filter: none;
  opacity: 1;
  z-index: 3;
  box-shadow: 0 12px 36px rgba(15,20,25,.18);
  cursor: default;
}
.gallery-slide.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.6);
}
.gallery-slide .slide-bg {
  position: absolute; inset: 0;
  background: repeating-linear-gradient(135deg, #1d2330 0 12px, #161b26 12px 24px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(232,236,242,.55);
  font-family: var(--mono);
  font-size: 12px;
}

.gallery-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--rule);
  color: var(--ink);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  z-index: 4;
  transition: all .15s;
  box-shadow: 0 2px 8px rgba(15,20,25,.08);
}
.gallery-nav:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.gallery-nav.prev { left: 8px; }
.gallery-nav.next { right: 8px; }

.gallery-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
}
.gallery-dots button {
  width: 28px; height: 4px;
  border: none;
  background: var(--rule);
  border-radius: 2px;
  cursor: pointer;
  transition: background .2s, width .2s;
  padding: 0;
}
.gallery-dots button.active {
  background: var(--accent);
  width: 44px;
}

@media (max-width: 760px) {
  .gallery-slide        { width: 78%; }
  .gallery-slide.left   { transform: translate(calc(-50% - 50%), -50%) scale(0.7); }
  .gallery-slide.right  { transform: translate(calc(-50% + 50%), -50%) scale(0.7); }
}

.bibtex { max-width: var(--maxw); margin: 56px auto; padding: 0 32px; }
.code-block {
  position: relative;
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 6px;
  padding: 18px 22px;
  overflow: hidden;
}
.code-block pre { margin: 0; }
.code-block code {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
}
.copy-btn {
  position: absolute;
  top: 12px; right: 12px;
  background: rgba(232,236,242,.1);
  color: var(--paper);
  border: 1px solid rgba(232,236,242,.2);
  border-radius: 4px;
  padding: 5px 10px;
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  transition: background .15s;
}
.copy-btn:hover { background: var(--accent); border-color: var(--accent); }

@media (max-width: 760px) {
  .hero { padding-top: 56px; }
  .tldr { flex-direction: column; gap: 8px; }
  .inst-btn.show-all { margin-left: 0; }
}
.gallery-slide .slide-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #0c1018;
  display: block;
}
.teaser-video {
  display: block;
  width: 100%;
  max-width: none;
  margin: 0 auto;
  height: auto;
  border-radius: 10px;
  background: #0c1018;
  box-shadow: 0 1px 2px rgba(15, 20, 25, .04),
              0 8px 28px rgba(15, 20, 25, .08);
}
@media (max-width: 760px) {
  .teaser-video { border-radius: 6px; }
}
.app-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 0 auto 26px;
  max-width: var(--maxw);
}
.app-tab {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink-2);
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
}
.app-tab:hover { border-color: var(--ink-3); color: var(--ink); }
.app-tab.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.compare-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.cmp-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}
.cmp-head {
  font-family: var(--mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--ink-3);
  text-align: center;
  padding: 2px 2px 4px;
}
.cmp-head.ours { color: var(--accent-2); font-weight: 600; }
.cmp-cell {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  background: #0c1018;
}
.cmp-cell img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cmp-cell.ours {
  border-color: var(--accent-2);
  box-shadow: none;
}

@media (max-width: 760px) {
  .cmp-row { gap: 6px; }
  .cmp-head { font-size: 9px; letter-spacing: .02em; padding-bottom: 2px; }
  .app-tab { font-size: 11px; padding: 8px 12px; }
}
.compare-grid { position: relative; isolation: isolate; overflow-x: auto; }
.comparison-canvas { position: fixed; top: 0; left: 0; pointer-events: none; z-index: 1; }
.cmp-row { min-width: 780px; }
.cmp-model { background: #fafbfc; cursor: grab; touch-action: none; }
.cmp-model:active { cursor: grabbing; }
.cmp-model:focus-visible { outline: 2px solid var(--accent-2); outline-offset: -3px; }
.cmp-status { position: absolute; inset: 0; display: flex; justify-content: center; align-items: center; padding: 8px; color: #596274; font-size: 11px; text-align: center; z-index: 2; }
.cmp-status[hidden] { display: none; }
.cmp-reset {
  position: absolute; top: 8px; right: 8px; z-index: 3;
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; padding: 0;
  border: 1px solid var(--rule); border-radius: 6px;
  background: rgba(250, 251, 252, .94); color: var(--ink-2);
  cursor: pointer;
}
.cmp-reset:hover { color: var(--accent-2); border-color: var(--accent-2); }
.cmp-input img { object-fit: contain; background: #fafbfc; }
.cmp-row[hidden] { display: none; }
.cmp-model { border: 0; }
.cmp-model::after {
  content: ''; position: absolute; inset: 0; border: 1px solid var(--rule);
  border-radius: inherit; pointer-events: none; z-index: 2;
}
.cmp-model.ours::after { border: 2px solid var(--accent-2); }
.cmp-case-carousel { min-width: 0; width: 100%; }
.cmp-case-carousel .case-track { min-width: 0; position: relative; }
.cmp-case-carousel .case-nav { font-size: 30px; }
.compare-grid { gap: 6px; }
.cmp-header { align-items: end; }
.cmp-head { padding: 0 2px 3px; font-weight: 500; letter-spacing: .04em; }
.cmp-reset:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }