/* ==========================================================================
   Project ("paper") pages: hero, sticky contents bar, method steps with live
   schematics, figures, stats, code, citation. Requires base.css.
   Each project sets its accent in projects/<name>/css/<name>.css.
   ========================================================================== */

:root { --toc-h: 48px; }

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

.paper-hero {
  padding: calc(var(--nav-h) + clamp(40px, 6vw, 76px)) 0 clamp(20px, 3vw, 32px);
  text-align: center;
  background: radial-gradient(70% 60% at 50% 0%, var(--accent-soft), transparent 72%);
}

.paper-hero__venue { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 18px; }

.paper-hero__title {
  margin-bottom: 10px;
  font-size: clamp(2.6rem, 1.8rem + 3.4vw, 4.2rem);
  letter-spacing: -0.035em;
}

.paper-hero__subtitle {
  max-width: 40ch;
  margin: 0 auto 22px;
  font-size: clamp(1.15rem, 1rem + 0.6vw, 1.45rem);
  font-weight: 500;
  line-height: 1.4;
  color: var(--text-2);
}

.paper-hero__authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px 18px;
  max-width: 820px;
  margin: 0 auto 6px;
  font-size: 0.98rem;
  color: var(--text-2);
}
.paper-hero__authors .me { color: var(--text); font-weight: 600; }
.paper-hero__affil { margin-bottom: 24px; font-size: 0.9rem; color: var(--text-3); }

.paper-hero__links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }

.paper-hero__tldr {
  max-width: 68ch;
  margin: 30px auto 0;
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--text-2);
  text-wrap: balance;
}
.paper-hero__tldr strong { color: var(--text); font-weight: 600; }

.teaser { margin-top: clamp(28px, 4vw, 44px); text-align: left; }

/* ---- Sticky contents bar -------------------------------------------------- */

.toc {
  position: sticky;
  top: var(--nav-h);
  z-index: 900;
  background: rgba(251, 250, 247, 0.92);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  backdrop-filter: saturate(1.4) blur(12px);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.toc__inner {
  display: flex;
  align-items: center;
  gap: 2px;
  height: var(--toc-h);
  overflow-x: auto;
  scrollbar-width: none;
}
.toc__inner::-webkit-scrollbar { display: none; }
.toc__label {
  flex: none;
  margin-right: 10px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}
.toc__link {
  flex: none;
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.2s ease, background-color 0.2s ease;
}
.toc__link:hover { color: var(--text); background: rgba(27, 27, 36, 0.05); text-decoration: none; }
.toc__link.is-active { color: var(--accent); background: var(--accent-soft); }

/* ---- Prose ---------------------------------------------------------------- */

.prose { max-width: 72ch; }
.prose p { font-size: 1.04rem; line-height: 1.75; color: var(--text-2); }
.prose p + p { margin-top: 1em; }
.prose strong { color: var(--text); font-weight: 600; }
.prose h3 { margin: 1.8em 0 0.6em; }

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}
@media (max-width: 900px) { .two-col { grid-template-columns: minmax(0, 1fr); } }

.keypoints { display: grid; gap: 14px; }
.keypoint {
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.keypoint h3 { margin-bottom: 4px; font-size: 1rem; }
.keypoint p { font-size: 0.92rem; color: var(--text-2); }

/* ---- Method steps --------------------------------------------------------- */

.steps { display: grid; gap: clamp(48px, 7vw, 88px); }

.step {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
}
.step--flip { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.step--flip .step__text { order: 2; }

.step__num {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}
.step h3 { margin-bottom: 10px; font-size: 1.35rem; letter-spacing: -0.015em; }
.step__text > p { color: var(--text-2); }
.step__text > p + p { margin-top: 12px; }
.step__text strong { color: var(--text); font-weight: 600; }

@media (max-width: 920px) {
  .step, .step--flip { grid-template-columns: minmax(0, 1fr); }
  .step--flip .step__text { order: 0; }
}

/* Equations */
.eq {
  margin-top: 16px;
  padding: 12px 16px;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  color: var(--text);
}
.eq + .eq { margin-top: 10px; }
.eq__label {
  display: block;
  margin-bottom: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}
.eq .katex-display { margin: 0.2em 0; }
.eq .katex { font-size: 1.05em; }

/* ---- Interactive schematics ----------------------------------------------- */

.viz {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.viz__stage {
  position: relative;
  aspect-ratio: var(--viz-ratio, 16 / 9);
  background: var(--viz-bg, #fff);
  touch-action: pan-y;
}
.viz__stage > canvas,
.viz__stage > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.viz__stage--auto { aspect-ratio: auto; }
.viz__stage--auto > svg { position: static; }

.viz__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 18px;
  padding: 10px 14px;
  background: var(--bg);
  border-top: 1px solid var(--border);
}
.viz__controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.viz__legend { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; font-size: 0.78rem; color: var(--text-2); }
.viz__legend span { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.swatch--line { width: 16px; height: 3px; border-radius: 2px; }
.swatch--dash { width: 16px; height: 0; border-top: 2px dashed currentColor; border-radius: 0; }
.swatch--square { border-radius: 2px; }

.viz__caption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--border);
  font-size: 0.87rem;
  line-height: 1.6;
  color: var(--text-2);
}
.viz__caption strong { color: var(--text); font-weight: 600; }
.viz-note {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  vertical-align: 1px;
}

.viz__readout {
  font-size: 0.8rem;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}
.viz__readout strong { color: var(--text); font-weight: 600; }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.2s ease;
}
.icon-btn:hover { border-color: var(--text); }
.icon-btn svg { width: 14px; height: 14px; }

.range {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-2);
}
.range input { width: 120px; accent-color: var(--accent); }

/* Overlay message inside a stage (e.g., WebGL unavailable) */
.viz__message {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-3);
}

/* ---- Figures, stats, cards ------------------------------------------------ */

.figure {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.figure img { width: 100%; height: auto; }
.figure figcaption {
  padding: 14px 18px 16px;
  border-top: 1px solid var(--border);
  font-size: 0.89rem;
  line-height: 1.6;
  color: var(--text-2);
}
.figure figcaption strong { color: var(--text); font-weight: 600; }
.figure + .figure { margin-top: 28px; }

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.stat { padding: 20px 22px; background: var(--surface); }
.stat__value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.stat__value small { font-size: 0.55em; font-weight: 600; color: var(--text-3); letter-spacing: 0; }
.stat__label { margin-top: 6px; font-size: 0.85rem; line-height: 1.45; color: var(--text-2); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.card {
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.card__kicker {
  margin-bottom: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.card h3 { margin-bottom: 4px; font-size: 1.02rem; }
.card__value { margin-bottom: 8px; font-size: 0.92rem; font-weight: 600; color: var(--text); }
.card p { font-size: 0.9rem; color: var(--text-2); }

/* ---- Diagrams (inline SVG) ------------------------------------------------ */

.diagram {
  overflow-x: auto;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.diagram svg { width: 100%; min-width: 760px; height: auto; }
.dg-box { fill: #fff; stroke: var(--border-strong); stroke-width: 1.2; }
.dg-box--in { fill: #f4f6fa; stroke: #a9b8d2; }
.dg-box--main { fill: var(--accent-soft); stroke: var(--accent-ring); stroke-width: 1.4; }
.dg-box--out { fill: #fbf4ec; stroke: #dfbd96; }
.dg-box--mask { fill: #f7f6f9; stroke: #b9b0cc; stroke-dasharray: 4 3; }
.dg-title { font: 600 13px var(--font-sans); fill: var(--text); text-anchor: middle; }
.dg-sub { font: 400 11px var(--font-sans); fill: var(--text-2); text-anchor: middle; }
.dg-sub--accent { fill: var(--accent); font-weight: 600; }
.dg-arrow { fill: none; stroke: #8b8b99; stroke-width: 1.5; }
.dg-arrow--dash { stroke-dasharray: 4 3; }
.dg-head { fill: #8b8b99; }
.dg-note { fill: var(--bg-subtle); stroke: var(--border); }
.dg-note-title { font: 600 11.5px var(--font-sans); fill: var(--accent); text-anchor: middle; }

/* ---- Tabs ----------------------------------------------------------------- */

.tabs__list {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-bottom: 18px;
  padding: 3px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.tabs__tab {
  height: 34px;
  padding: 0 16px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
}
.tabs__tab[aria-selected='true'] { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm), 0 0 0 1px var(--border); }
.tabs__panel[hidden] { display: none; }

.detail-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.detail { padding: 18px 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.detail h4 { margin-bottom: 6px; font-size: 0.95rem; letter-spacing: -0.01em; }
.detail p { font-size: 0.89rem; color: var(--text-2); }
@media (max-width: 900px) { .detail-grid { grid-template-columns: minmax(0, 1fr); } }

/* ---- Code, usage, callouts, citation --------------------------------------- */

.code {
  position: relative;
  overflow: hidden;
  background: #f6f5f1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.code pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.65;
  color: #24242d;
  tab-size: 2;
}
.code__copy { position: absolute; top: 8px; right: 8px; }
.code__copy.btn--sm { height: 28px; padding: 0 10px; font-size: 0.75rem; }
.code .c { color: #6e6e7d; }

.usage { display: grid; gap: 22px; counter-reset: usage; }
.usage__step { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 14px; }
.usage__step::before {
  content: counter(usage);
  counter-increment: usage;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
}
.usage__step h3 { margin-bottom: 4px; font-size: 1rem; }
.usage__step p { margin-bottom: 10px; font-size: 0.93rem; color: var(--text-2); }

.callout {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--text-2);
}
.callout svg { flex: none; width: 18px; height: 18px; margin-top: 2px; color: var(--accent); }
.callout strong { color: var(--text); }

.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.config-item { display: flex; justify-content: space-between; gap: 10px; padding: 10px 14px; background: var(--surface); font-size: 0.82rem; }
.config-item code { border: 0; padding: 0; background: none; color: var(--text-2); }
.config-item span { font-family: var(--font-mono); font-weight: 600; color: var(--text); }

.cite__note { margin-bottom: 12px; color: var(--text-2); }

/* ---- Small screens -------------------------------------------------------- */

@media (max-width: 600px) {
  :root { --toc-h: 44px; }
  .paper-hero__authors { font-size: 0.92rem; gap: 2px 12px; }
  .viz__bar { padding: 10px 12px; }
  .range input { width: 96px; }
}

/* Grid children may shrink below their content width (wide equations scroll inside .eq). */
.step > *, .two-col > *, .detail-grid > * { min-width: 0; }