/* ------------------------------------------------------------------
   GNOCHI paper website
   Palette: conditioning purple / reaction green (from the paper figures)
   Fonts are self-hosted (static/fonts/) so the site has zero external
   dependencies and works offline / on any host.
------------------------------------------------------------------- */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/inter-400.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/inter-600.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/inter-700.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url("../fonts/inter-800.woff2") format("woff2");
}
:root {
  --purple: #8a5fb0;
  --purple-dark: #5e3d84;
  --purple-tint: #f3edf8;
  --green: #33a274;
  --green-dark: #1e6b4c;
  --green-tint: #e9f6f0;
  --ink: #1c1c1e;
  --ink-soft: #55555c;
  --ink-muted: #86868f;
  --line: #e4e4e8;
  --bg: #ffffff;
  --bg-soft: #f7f7f9;
  --radius: 12px;
  --content: 860px;
  --wide: 1140px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; display: block; }

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

.content { max-width: var(--content); margin: 0 auto; padding: 0 20px; }
.wide { max-width: var(--wide); margin: 0 auto; padding: 0 20px; }

section { padding: 3.2rem 0 0.4rem; }

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

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.6rem;
}

.section-kicker {
  display: block;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 0.4rem;
}

/* ------------------------------------------------------------ hero */
.hero { padding: 3.6rem 0 1rem; text-align: center; }

.venue-pill {
  display: inline-block;
  background: var(--green-tint);
  color: var(--green-dark);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem 1rem;
  border-radius: 999px;
  margin-bottom: 1.2rem;
}

.hero h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.7rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 auto 0.6rem;
  max-width: 900px;
}

.hero h1 .gnochi { color: var(--purple-dark); }

.hero .subtitle {
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin: 0 0 1.6rem;
}

.authors {
  font-size: 1.1rem;
  margin: 0 0 0.35rem;
  line-height: 1.9;
}

.authors .author { white-space: nowrap; padding: 0 0.55rem; }
.authors a { color: var(--ink); font-weight: 600; }
.authors a:hover { color: var(--purple-dark); }
.authors sup { color: var(--ink-muted); font-size: 0.72em; }

.affiliation {
  color: var(--ink-soft);
  font-size: 0.98rem;
  margin: 0 0 0.3rem;
}

.author-notes {
  color: var(--ink-muted);
  font-size: 0.85rem;
  margin: 0 0 1.8rem;
}

/* link buttons */
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-bottom: 2.4rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--ink);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.55rem 1.25rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn:hover { background: var(--purple-dark); text-decoration: none; transform: translateY(-1px); }
.btn svg { width: 18px; height: 18px; fill: currentColor; }
.btn .hf-emoji { font-size: 1.05rem; line-height: 1; }

.btn.soon {
  background: var(--bg-soft);
  color: var(--ink-muted);
  cursor: default;
  border: 1px solid var(--line);
}
.btn.soon:hover { background: var(--bg-soft); transform: none; }

.btn.soon .soon-tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--purple-tint);
  color: var(--purple-dark);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
}

/* ----------------------------------------------------- teaser/video */
.video-box {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  box-shadow: 0 12px 40px rgba(46, 22, 70, 0.14);
  cursor: pointer;
  transition: height 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

.video-box img.poster { width: 100%; }

.video-box.video-started { cursor: default; }
.video-box.video-settled { aspect-ratio: 16 / 9; }

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  opacity: 0;
  transition: opacity 0.45s ease;
}

.hero-video.visible { opacity: 1; }

.video-box .play-btn {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  border: none;
  background: rgba(28, 28, 30, 0.72);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.video-box:hover .play-btn { background: var(--purple-dark); transform: scale(1.07); }
.video-box .play-btn svg { width: 34px; height: 34px; fill: #fff; margin-left: 5px; }

.video-box .watch-hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 12px;
  text-align: center;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.55);
  pointer-events: none;
}

.video-box video { width: 100%; display: block; }

.teaser-caption {
  color: var(--ink-soft);
  font-size: 0.92rem;
  text-align: center;
  max-width: 780px;
  margin: 1rem auto 0;
}

.cond { color: var(--purple-dark); font-weight: 600; }
.react { color: var(--green-dark); font-weight: 600; }

/* -------------------------------------------------------- abstract */
.abstract p {
  font-size: 1.04rem;
  color: var(--ink-soft);
  text-align: justify;
  margin: 0 0 1rem;
}

/* ----------------------------------------------------- how it works */
.pipeline-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  background: #fff;
}

.step-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.4rem;
}

.step-card {
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.step-card .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: var(--purple);
  margin-bottom: 0.5rem;
}

.step-card:nth-child(2) .step-num { background: var(--green); }
.step-card:nth-child(3) .step-num { background: var(--purple-dark); }

.step-card p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }

/* --------------------------------------------------------- explorer */
.panel {
  background: var(--bg-soft);
  border-radius: 16px;
  padding: 1.6rem;
}

.mode-toggle {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: 1rem;
}

.mode-btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.5rem 1.4rem;
  cursor: pointer;
  transition: all 0.12s ease;
}

.mode-btn:first-child { border-radius: 999px 0 0 999px; border-right: none; }
.mode-btn:last-child { border-radius: 0 999px 999px 0; }

.mode-btn.active {
  background: var(--purple-dark);
  border-color: var(--purple-dark);
  color: #fff;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.2rem;
}

.chip {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.35rem 0.95rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.12s ease;
}

.chip:hover { border-color: var(--purple); color: var(--purple-dark); }
.chip.active { background: var(--purple-dark); border-color: var(--purple-dark); color: #fff; }

.viewer3d {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  max-height: 620px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  touch-action: none;
}

.viewer3d canvas { display: block; width: 100%; height: 100%; }

.viewer-hint {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(28, 28, 30, 0.6);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.85rem;
  border-radius: 999px;
  pointer-events: none;
  transition: opacity 0.5s ease;
  z-index: 2;
}

.viewer-hint.fade-out { opacity: 0; }

.viewer-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.45);
  z-index: 3;
  pointer-events: none;
}

.vspinner {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 4px solid var(--purple-tint);
  border-top-color: var(--purple-dark);
  animation: vspin 0.8s linear infinite;
}

@keyframes vspin { to { transform: rotate(360deg); } }

.viewer-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 2rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
  text-align: center;
}

.sample-count {
  color: var(--ink-muted);
  font-size: 0.9rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.explorer-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.1rem;
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--green-dark);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.55rem 1.3rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn-accent:hover { background: var(--green); transform: translateY(-1px); }
.btn-accent svg { width: 18px; height: 18px; fill: currentColor; }

.legend-note {
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.85rem;
  margin-top: 0.9rem;
}

/* ------------------------------------------------------- comparison */
.tab-row {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.3rem;
  flex-wrap: wrap;
}

.method-row { margin-bottom: 1.2rem; }

.method-label {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.18rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 0.55rem;
}

.method-label.ours { background: var(--green-tint); color: var(--green-dark); }
.method-label.buddi { background: #f2f2f4; color: var(--ink-soft); }

.compare-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.7rem;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.pair img { width: 100%; aspect-ratio: 1; object-fit: cover; }

/* ---------------------------------------------------- interpolation */
.interp-controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  max-width: 560px;
  margin: 1rem auto 0;
}

.icon-btn {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--purple-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.12s ease;
}

.icon-btn:hover { border-color: var(--purple); background: var(--purple-tint); }
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--purple), var(--green));
  outline-offset: 4px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--purple-dark);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--purple-dark);
  cursor: grab;
}

/* ----------------------------------------------------- before/after */
.ba-wrap {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  touch-action: none;
  cursor: ew-resize;
}

.ba-wrap:focus-visible {
  outline: 3px solid var(--purple);
  outline-offset: 3px;
}

.ba-wrap img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.ba-divider {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3px;
  background: #fff;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.35);
  transform: translateX(-50%);
  pointer-events: none;
}

.ba-divider::after {
  content: "\2194";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  color: var(--ink);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.ba-tag {
  position: absolute;
  top: 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(28, 28, 30, 0.72);
  color: #fff;
  pointer-events: none;
}

.ba-tag.left { left: 10px; }
.ba-tag.right { right: 10px; }

.controlnet-thumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: center;
  margin-top: 1rem;
}

.controlnet-thumbs button {
  padding: 0;
  width: 64px;
  height: 64px;
  border: 2px solid transparent;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  background: none;
}

.controlnet-thumbs button.active { border-color: var(--green-dark); }
.controlnet-thumbs img { width: 100%; height: 100%; object-fit: cover; }

/* ------------------------------------------------------------ stats */
.stats-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  text-align: center;
}

.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--purple-dark);
  margin: 0 0 0.2rem;
}

.stat-card:nth-child(2) .stat-value { color: var(--green-dark); }

.stat-card .stat-label {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
}

.stat-footnote {
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.85rem;
  margin-top: 1rem;
}

/* ----------------------------------------------------------- bibtex */
.bibtex-box {
  position: relative;
  background: #22222a;
  color: #e8e8ef;
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  overflow-x: auto;
}

.bibtex-box pre {
  margin: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.86rem;
  line-height: 1.55;
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}

.copy-btn:hover { background: rgba(255, 255, 255, 0.22); }
.copy-btn svg { width: 14px; height: 14px; fill: currentColor; }

/* -------------------------------------------------- acknowledgments */
.acks p { font-size: 0.9rem; color: var(--ink-muted); text-align: justify; }
.funding-logos { max-width: 720px; margin: 1.4rem auto 0; }

footer {
  margin-top: 3.5rem;
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

/* ------------------------------------------------------- responsive */
@media (max-width: 860px) {
  .compare-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .viewer3d { aspect-ratio: 1; }
  .video-box .play-btn { width: 64px; height: 64px; }
  .authors .author { display: block; padding: 0; }
}