:root {
  --ink: #14232d;
  --ink-soft: #2a4150;
  --muted: #5d6f78;
  --paper: #f4eee4;
  --paper-2: #ebe1d1;
  --cream: #fffaf3;
  --coral: #d85a3c;
  --coral-deep: #b5442c;
  --gold: #e0a85a;
  --teal: #2f6b66;
  --teal-soft: #7ea39a;
  --line: rgba(20, 35, 45, 0.12);
  --shadow: 0 18px 50px rgba(20, 35, 45, 0.1);
  --radius: 22px;
  --font: "Segoe UI", system-ui, sans-serif;
  --display: Georgia, "Times New Roman", serif;
  --mono: Consolas, "Cascadia Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(224, 168, 90, 0.18), transparent 50%),
    radial-gradient(900px 500px at 100% 0%, rgba(47, 107, 102, 0.12), transparent 45%),
    var(--paper);
  min-height: 100vh;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
button, a { font: inherit; }
code { font-family: var(--mono); font-size: 0.92em; }

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 8;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 28px;
  background: rgba(244, 238, 228, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  min-width: 220px;
}
.brand strong { display: block; font-size: 1rem; }
.brand small { color: var(--muted); font-size: 0.75rem; }
.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
}
.brand-mark i {
  background: var(--ink);
  border-radius: 2px;
  animation: pulse-tile 2.8s ease-in-out infinite;
}
.brand-mark i:nth-child(odd) { background: var(--coral); }
.brand-mark i:nth-child(3n) { background: var(--teal); animation-delay: 0.4s; }
.brand-mark i:nth-child(5) { background: var(--gold); animation-delay: 0.2s; }

.topbar-end {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  flex: 1;
  justify-content: flex-end;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.lang-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.lang-select {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  background: var(--cream);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
.lang-select:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 4px;
}
.tab {
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: 0.25s ease;
}
.tab:hover { background: rgba(20, 35, 45, 0.06); }
.tab.is-active {
  background: var(--ink);
  color: var(--cream);
}

.panel { display: none; animation: rise 0.55s ease; }
.panel.is-active { display: block; }

.hero, .section-block {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}
.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  padding: 56px 0 24px;
  align-items: center;
}
.section-block { padding: 28px 0 72px; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  color: var(--coral-deep);
  font-weight: 700;
  margin: 0 0 10px;
}
.eyebrow.light { color: #f3c7b6; }

h1, h2, .section-title {
  font-family: var(--display);
  font-weight: 620;
  letter-spacing: -0.03em;
  line-height: 1.12;
}
h1 { font-size: clamp(2.2rem, 4.4vw, 4.1rem); margin: 0 0 18px; }
.section-title { font-size: clamp(2rem, 3.5vw, 3.2rem); margin: 0 0 16px; }
.lead, .section-intro {
  font-size: 1.12rem;
  color: var(--ink-soft);
  max-width: 68ch;
}
.section-intro { margin-bottom: 36px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0; }
.btn {
  border: 0;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: var(--coral); color: white; box-shadow: 0 10px 24px rgba(216, 90, 60, 0.28); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 8px 0 0;
}
.hero-stats dt { font-size: 0.78rem; color: var(--muted); }
.hero-stats dd { margin: 0; font-weight: 700; font-size: 1.05rem; }

.hero-stage {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: center;
}
.stage-card {
  background: var(--cream);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.6);
}
.stage-card img, .puzzle img {
  width: 100%;
  border-radius: 14px;
  background: #ddd;
}
.stage-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 10px;
}
.stage-arrow {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}
.puzzle {
  overflow: hidden;
  border-radius: 14px;
  animation: assemble 2.8s ease both;
}

.card-grid { display: grid; gap: 18px; }
.card-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.info-card, .constraint-box, .stat-card, .metric-card, .model-banner {
  background: var(--cream);
  border: 1px solid rgba(255,255,255,0.65);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.info-card, .constraint-box { padding: 24px; }
.card-index {
  display: inline-block;
  font-family: var(--mono);
  color: var(--coral);
  margin-bottom: 10px;
}
.info-card h3, .constraint-box h3 { margin: 0 0 10px; font-size: 1.2rem; }
.info-card p, .constraint-box li { color: var(--ink-soft); }
.constraint-box { margin-top: 28px; }
.constraint-box ul { margin: 0; padding-left: 18px; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card { padding: 22px; }
.stat-card strong {
  display: block;
  font-family: var(--display);
  font-size: 2rem;
  line-height: 1.1;
}
.stat-card span { color: var(--muted); font-size: 0.92rem; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 28px; }
.plain-list { padding-left: 18px; color: var(--ink-soft); }
.chip-wrap { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  background: #efe4d3;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.88rem;
}

.gallery, .card-grid { margin-bottom: 8px; }
.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.gallery figure, .result-figure {
  margin: 0;
  background: var(--cream);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.gallery img, .result-figure img { width: 100%; }
.gallery figcaption, .result-figure figcaption {
  padding: 12px 16px 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

.pipeline {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  display: grid;
  gap: 12px;
}
.pipeline li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  align-items: start;
  background: var(--cream);
  border-radius: 18px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.pipeline span {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--cream);
  font-weight: 700;
}
.pipeline h3 { margin: 0 0 4px; }
.pipeline p { margin: 0; color: var(--ink-soft); }

.model-banner {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 24px;
  padding: 28px;
  background:
    linear-gradient(135deg, #1a3038, #24443e 55%, #8a4a34);
  color: #fffaf3;
  margin-bottom: 22px;
}
.model-banner h3 { font-family: var(--display); font-size: 2rem; margin: 0 0 8px; }
.model-banner p { color: #ecdcc8; }
.mini-stats { display: grid; gap: 12px; margin: 0; }
.mini-stats dt { color: #d7c4ae; font-size: 0.8rem; }
.mini-stats dd { margin: 0; font-size: 1.4rem; font-weight: 700; }

.snippet {
  background: #17242c;
  color: #f6efe4;
  border-radius: 18px;
  padding: 20px;
  overflow: auto;
  box-shadow: var(--shadow);
}
.snippet code,
.snippet .hljs {
  color: #f6efe4;
  background: transparent;
}
.snippet .hljs-keyword { color: #f3b184; }
.snippet .hljs-string { color: #ead48a; }
.snippet .hljs-built_in,
.snippet .hljs-title { color: #8fcdb8; }
.snippet .hljs-number { color: #e0a85a; }
.model-banner .btn.ghost {
  color: #fffaf3;
  border-color: rgba(255, 250, 243, 0.32);
}

.metrics-compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 18px;
  align-items: stretch;
  margin-bottom: 28px;
}
.metric-card { padding: 28px; text-align: center; }
.metric-card p { margin: 0; color: var(--muted); }
.metric-card strong {
  display: block;
  font-family: var(--display);
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  margin: 8px 0;
}
.metric-card.model { background: #1f3a36; color: #fff7ec; }
.metric-card.model p, .metric-card.model span { color: #d7c8b0; }
.metric-delta {
  align-self: center;
  text-align: center;
  background: var(--gold);
  color: var(--ink);
  border-radius: 999px;
  width: 92px;
  height: 92px;
  display: grid;
  place-content: center;
  font-family: var(--display);
  box-shadow: var(--shadow);
}
.metric-delta span { font-size: 1.5rem; font-weight: 700; }
.result-figure { margin-top: 18px; }

.colab-shell {
  background: #fff;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid #eadfce;
}
.colab-chrome {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  background: #f8f4ee;
  border-bottom: 1px solid #eadfce;
}
.colab-dots { display: flex; gap: 6px; }
.colab-dots i { width: 10px; height: 10px; border-radius: 50%; background: #d0c4b4; }
.colab-dots i:first-child { background: #e06b4f; }
.colab-title { font-weight: 600; }
.colab-badge {
  background: #f9ab00;
  color: #1f1f1f;
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 0.75rem;
  margin-right: 8px;
}
.colab-meta { color: var(--muted); font-size: 0.82rem; }
.notebook { padding: 8px 0 24px; background: #fff; }

.nb-cell { display: grid; grid-template-columns: 72px 1fr; gap: 8px; padding: 8px 16px; }
.nb-cell.markdown { align-items: start; }
.nb-gutter {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: #303f9f;
  padding-top: 10px;
  user-select: none;
}
.nb-cell.markdown .nb-gutter { color: transparent; }
.nb-code {
  background: #f7f7f7;
  border-radius: 8px;
  overflow: auto;
  border: 1px solid #eee;
}
.nb-code pre { margin: 0; padding: 12px 14px; }
.nb-md { padding: 4px 8px 8px 0; max-width: 80ch; }
.nb-md h1, .nb-md h2, .nb-md h3 { font-family: var(--display); margin: 0.4em 0 0.35em; }
.nb-md p { margin: 0.4em 0; color: #333; }
.nb-md ul, .nb-md ol { padding-left: 18px; }
.nb-out { grid-column: 2; }
.nb-stream, .nb-plain {
  font-family: var(--mono);
  font-size: 0.78rem;
  white-space: pre;
  overflow-x: auto;
  background: #fff;
  color: #222;
  margin: 6px 0;
  line-height: 1.35;
}
.nb-img {
  max-width: min(720px, 100%);
  border: 1px solid #eee;
  border-radius: 8px;
  margin: 8px 0 12px;
  background: #fff;
}
.nb-empty { color: #9aa; font-size: 0.75rem; font-family: var(--mono); }

.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 12px 20px 36px;
  font-size: 0.88rem;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: rise 0.7s ease forwards;
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

@keyframes rise {
  to { opacity: 1; transform: none; }
}
@keyframes pulse-tile {
  50% { opacity: 0.45; transform: scale(0.86); }
}
@keyframes assemble {
  0% { filter: blur(6px); transform: scale(0.96) rotate(-1deg); }
  100% { filter: none; transform: none; }
}

.dropzone {
  display: grid;
  place-items: center;
  gap: 6px;
  min-height: 140px;
  padding: 28px;
  border: 1.5px dashed rgba(20, 35, 45, 0.22);
  border-radius: var(--radius);
  background: var(--cream);
  cursor: pointer;
  text-align: center;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}
.dropzone:hover, .dropzone.is-hot {
  border-color: var(--coral);
  background: #fff7ef;
  transform: translateY(-2px);
}
.dropzone span { color: var(--muted); font-size: 0.92rem; }

.demo-status {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 16px;
  margin-bottom: 18px;
  background: var(--cream);
  box-shadow: var(--shadow);
}
.demo-status p { margin: 0; }
.demo-dot {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--gold);
  flex: 0 0 auto;
}
.demo-status[data-state="ready"] .demo-dot { background: var(--teal); }
.demo-status[data-state="missing"] .demo-dot { background: var(--coral); }
.demo-status[data-state="error"] .demo-dot { background: var(--coral-deep); }

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 18px 0;
}
.demo-actions .btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}
.demo-mae {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.88rem;
  color: var(--teal);
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.demo-grid figure {
  margin: 0;
  background: var(--cream);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.demo-grid figcaption {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}
.demo-grid canvas {
  width: 100%;
  aspect-ratio: 1;
  image-rendering: pixelated;
  background:
    linear-gradient(45deg, #efe4d3 25%, transparent 25%) 0 0 / 16px 16px,
    linear-gradient(-45deg, #efe4d3 25%, transparent 25%) 0 8px / 16px 16px,
    #fffaf3;
  border-radius: 12px;
}
.snippet.compact {
  margin: 10px 0 0;
  padding: 12px 14px;
}
.constraint-box .plain-list { padding-left: 18px; }

@media (max-width: 980px) {
  .topbar { flex-direction: column; align-items: stretch; }
  .topbar-end { flex-direction: column; align-items: stretch; }
  .lang-switch { justify-content: space-between; }
  .hero, .hero-stage, .card-grid.three, .stat-row, .split, .gallery, .model-banner, .metrics-compare, .demo-grid {
    grid-template-columns: 1fr;
  }
  .hero-stage { gap: 18px; }
  .stage-arrow { writing-mode: horizontal-tb; transform: none; text-align: center; }
  .metric-delta { margin: 0 auto; }
  .nb-cell { grid-template-columns: 42px 1fr; padding-inline: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .reveal { opacity: 1; transform: none; }
}