/* TAPESTRY project page
   --------------------------------------------------------------
   Aesthetic: warm off-white background, near-black body, single
   blue accent for links/rules. Display in Fraunces (variable),
   body in Inter. No icons, no boxes, no gradients. Long calm
   scroll with generous vertical rhythm.
*/

:root {
  /* Palette — pulled from the paper's figure code.
     hf_diagnostics/render_figures.py:
       C_VIDEO_DARK  = #0b5394   (ocean blue)
       C_ACTION_DARK = #ff9900   (orange)
     Purple is a placeholder for the algorithm-figure violet.
  */
  --bg:           #FAFAF7;
  --text:         #1A1A1A;
  --text-muted:   #5A5A57;
  --rule:         #E5E2D8;

  --accent:       #0b5394;       /* primary — links, rule emphasis  */
  --accent-warm:  #ff9900;       /* secondary — reserved for media  */
  --accent-cool:  #7B6BAE;       /* tertiary  — algorithm-figure violet (headliner_v6) */

  --measure:       50rem;        /* ~900px prose width              */
  --measure-wide:  80rem;        /* ~1440px for media               */
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 17px;
  line-height: 1.65;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 7rem 1.5rem 6rem;
}

/* ---------- Hero ---------- */

.hero {
  margin-bottom: 5rem;
  text-align: center;
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 2.5rem;
}

.title {
  /* Proportional geometric sans, heavy weight. Reads as a
     wordmark — wider letterforms than a display serif so the
     all-caps "TAPESTRY" doesn't feel narrow/tall. Easy swaps:
       'Manrope'           (current) — clean, slightly humanist
       'Plus Jakarta Sans'           — friendlier, more rounded
       'Sora'                        — more geometric / engineered
  */
  font-family: 'Manrope', system-ui, sans-serif;
  font-weight: 800;
  font-size: clamp(2.75rem, 7.5vw, 4.75rem);
  line-height: 1;
  letter-spacing: -0.025em;
  margin: 0 0 1.75rem;
}

.tagline {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: "opsz" 36, "wght" 400;
  font-size: 1.35rem;
  line-height: 1.45;
  color: var(--text);
  max-width: 30rem;
  margin: 0 auto 2.5rem;
}

/* ---------- Link buttons ---------- */

.links {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1.25rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--rule);
  border-radius: 999px;
  transition: border-color 120ms ease, color 120ms ease, background 120ms ease;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Sections ---------- */

section {
  margin-top: 4.5rem;
}

section h2 {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: "opsz" 36, "wght" 600;
  font-weight: 600;
  font-size: 1.55rem;
  letter-spacing: -0.005em;
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

p { margin: 0 0 1.1rem; }

p:last-child { margin-bottom: 0; }

strong { font-weight: 600; }

em {
  font-style: italic;
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: border-color 120ms ease;
}

a:hover { border-bottom-color: var(--accent); }

/* ---------- BibTeX ---------- */

.bibtex pre {
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.1rem 1.25rem;
  margin: 0;
  overflow-x: auto;
  font-family: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text);
}

.bibtex code { font-family: inherit; }

/* ---------- Media ---------- */

.hero-video,
.figure-wide,
.video-stack {
  width: min(var(--measure-wide), 100%);
  margin-left: 50%;
  transform: translateX(-50%);
}

.hero-video video,
.figure-wide img,
.figure-wide video,
.video-stack video {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

/* Reserve a 16:9 box up front so the video element doesn't collapse to
   controls-only height before metadata loads. All rollouts are 1920x1080. */
.video-stack video,
.hero-video video {
  aspect-ratio: 16 / 9;
  background: #000;
  object-fit: contain;
}

.hero-video figcaption,
.figure-wide figcaption,
.video-stack figcaption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.6rem;
  text-align: center;
}

.video-stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.video-stack figure { margin: 0; }

/* ---------- Mobile ---------- */

@media (max-width: 600px) {
  main { padding: 4rem 1.25rem 3rem; }
  .hero { margin-bottom: 3rem; }
  section { margin-top: 3rem; }
  body { font-size: 16px; }
}