code/docs/style.css

:root {
  --bg: #fffcfd;
  --bg-soft: #fff5f8;
  --surface: #ffffff;
  --surface-2: #fbf0f4;
  --text: #191218;
  --text-soft: #655b63;
  --border: #ead9df;
  --brand: #bf5276;
  --brand-2: #d97498;
  --accent: #84354e;
  --ring: rgba(191, 82, 118, 0.28);
  --shadow: 0 14px 36px rgba(93, 45, 61, 0.08);
  --shadow-lg: 0 22px 48px rgba(93, 45, 61, 0.12);
  --nav-h: 72px;
  --figure-max: 880px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
  scroll-padding-top: var(--nav-h);
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background-color: #fff9fb;
  min-height: 100vh;
}

a {
  color: inherit;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.page-shell {
  position: relative;
  width: 100%;
  overflow-x: hidden;
  isolation: isolate;
}

#main-content {
  width: 100%;
  position: relative;
  z-index: 1;
}

/* Ambient background — layered gradients + slow motion */
.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  overflow: hidden;
  background: linear-gradient(
    165deg,
    #fffcfd 0%,
    #fff6f9 38%,
    #fff0f5 68%,
    #fffbfc 100%
  );
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  opacity: 0.55;
  will-change: transform;
}

.ambient-orb--rose {
  width: min(58vw, 520px);
  height: min(58vw, 520px);
  top: -12%;
  left: -8%;
  background: radial-gradient(
    circle,
    rgba(191, 82, 118, 0.42) 0%,
    rgba(191, 82, 118, 0.12) 45%,
    transparent 70%
  );
  animation: orbDriftRose 22s ease-in-out infinite;
}

.ambient-orb--blush {
  width: min(50vw, 460px);
  height: min(50vw, 460px);
  top: 8%;
  right: -10%;
  background: radial-gradient(
    circle,
    rgba(217, 116, 152, 0.38) 0%,
    rgba(255, 182, 198, 0.14) 50%,
    transparent 72%
  );
  animation: orbDriftBlush 26s ease-in-out infinite;
}

.ambient-orb--pearl {
  width: min(64vw, 580px);
  height: min(64vw, 580px);
  bottom: -18%;
  left: 22%;
  background: radial-gradient(
    circle,
    rgba(255, 220, 230, 0.5) 0%,
    rgba(191, 82, 118, 0.1) 40%,
    transparent 68%
  );
  animation: orbDriftPearl 30s ease-in-out infinite;
}

.ambient-shimmer {
  position: absolute;
  inset: -20%;
  background: conic-gradient(
    from 200deg at 50% 45%,
    transparent 0deg,
    rgba(191, 82, 118, 0.06) 55deg,
    transparent 110deg,
    rgba(217, 116, 152, 0.05) 200deg,
    transparent 280deg,
    rgba(255, 200, 215, 0.04) 330deg,
    transparent 360deg
  );
  animation: shimmerRotate 48s linear infinite;
  opacity: 0.9;
}

.page-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.2;
  background-image: radial-gradient(circle, rgba(191, 82, 118, 0.11) 1px, transparent 1px);
  background-size: 26px 26px;
  z-index: -2;
  animation: gridPulse 8s ease-in-out infinite;
}

.page-shell::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse 120% 80% at 50% 0%, rgba(255, 255, 255, 0.55), transparent 55%),
    radial-gradient(ellipse 90% 60% at 50% 100%, rgba(191, 82, 118, 0.06), transparent 50%);
}

@keyframes orbDriftRose {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(4%, 6%) scale(1.06);
  }
  66% {
    transform: translate(2%, 3%) scale(0.96);
  }
}

@keyframes orbDriftBlush {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  40% {
    transform: translate(-5%, 4%) scale(1.08);
  }
  70% {
    transform: translate(-2%, 7%) scale(0.94);
  }
}

@keyframes orbDriftPearl {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(6%, -4%) scale(1.05);
  }
}

@keyframes shimmerRotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes gridPulse {
  0%,
  100% {
    opacity: 0.18;
  }
  50% {
    opacity: 0.24;
  }
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

/* Scroll progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 70;
  pointer-events: none;
  background: color-mix(in srgb, var(--border) 40%, transparent);
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--brand), var(--brand-2));
  border-radius: 0 2px 2px 0;
  transition: width 0.08s linear;
  box-shadow: 0 0 12px color-mix(in srgb, var(--brand) 45%, transparent);
}

/* Section scroll snap & progress dots */
.slide-dots {
  position: fixed;
  right: 14px;
  top: 50%;
  z-index: 55;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.slide-dots button {
  position: relative;
  width: 9px;
  height: 9px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: color-mix(in srgb, var(--brand) 28%, var(--border));
  cursor: pointer;
  transition: transform 0.25s var(--ease-out), background 0.25s ease, box-shadow 0.25s ease;
}

.slide-dots button::after {
  content: attr(data-label);
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%) translateX(6px);
  padding: 0.28rem 0.55rem;
  border-radius: 0.4rem;
  background: var(--text);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s var(--ease-out);
}

.slide-dots button:hover::after,
.slide-dots button:focus-visible::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.slide-dots button:hover {
  transform: scale(1.2);
  background: color-mix(in srgb, var(--brand) 55%, var(--border));
}

.slide-dots button.is-active {
  transform: scale(1.35);
  background: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 25%, transparent);
}

/* Back to top */
.back-top {
  position: fixed;
  right: 1.1rem;
  bottom: 1.25rem;
  z-index: 56;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid color-mix(in srgb, var(--brand) 35%, var(--border));
  border-radius: 50%;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  color: var(--accent);
  cursor: pointer;
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  transition: transform 0.25s var(--ease-out), opacity 0.25s ease, border-color 0.2s ease;
  opacity: 0;
  pointer-events: none;
}

.back-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.back-top:hover {
  transform: translateY(-3px);
  border-color: var(--brand);
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s var(--ease-out), transform 0.65s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal .card,
.reveal .section-figure,
.reveal .qual-viewer {
  transition-delay: 0.05s;
}

/* Nav */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  backdrop-filter: blur(16px) saturate(1.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

.top-nav.is-scrolled {
  box-shadow: 0 8px 24px rgba(93, 45, 61, 0.06);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
}

.top-nav__inner {
  min-height: var(--nav-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.65rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.04rem;
  flex-shrink: 0;
}

.brand:hover {
  text-decoration: none;
}

.brand-name {
  color: var(--text);
}

.brand-team {
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--brand) 12%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--brand) 35%, var(--border));
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  flex-wrap: nowrap;
  min-width: 0;
}

.nav-link {
  text-decoration: none;
  color: var(--text-soft);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.38rem;
  white-space: nowrap;
  border-radius: 0.45rem;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--accent);
  background: color-mix(in srgb, var(--brand) 10%, transparent);
  text-decoration: none;
}

.nav-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  flex-shrink: 0;
}

.action-btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 0.6rem;
  min-height: 2.2rem;
  padding: 0.35rem 0.7rem;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.action-btn:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--brand) 58%, var(--border));
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0 0 1rem;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 95%, transparent);
}

.top-nav.is-open .nav-mobile {
  display: flex;
}

.nav-mobile .nav-link {
  padding: 0.55rem 0.65rem;
}

/* Sections (starVLA-style: normal flow, container max-width) */
.section {
  position: relative;
  padding: 4.5rem 0;
  scroll-margin-top: var(--nav-h);
  scroll-snap-align: start;
}

#main-content > .section + .section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(1120px, calc(100% - 2rem));
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in srgb, var(--brand) 18%, var(--border)) 18%,
    color-mix(in srgb, var(--brand) 18%, var(--border)) 82%,
    transparent 100%
  );
  opacity: 0.85;
}

#main-content > .section:nth-of-type(even) {
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--surface) 55%, transparent) 0%,
    color-mix(in srgb, var(--surface-2) 28%, transparent) 100%
  );
  backdrop-filter: blur(2px);
}

.section--center .container {
  text-align: center;
}

.section--center .section-lead {
  margin-inline: auto;
}

.section--center .feature-grid {
  text-align: left;
}

.section--center .bullet-list {
  display: inline-block;
  text-align: left;
}

.section--center .qual-viewer,
.section--center .section-figure {
  margin-inline: auto;
}

.section--compact {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
}


.section-kicker {
  margin: 0 0 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand);
}

.section-title {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.6rem, 4vw, 2.35rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.section-lead {
  margin-top: 0.8rem;
  color: var(--text-soft);
  line-height: 1.7;
  max-width: 70ch;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 2.2rem;
  align-items: center;
}

.hero--single {
  grid-template-columns: 1fr;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.72rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--brand) 58%, transparent);
  background: color-mix(in srgb, var(--brand) 10%, var(--surface));
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--brand) 85%, var(--text));
}

.hero-title {
  margin-top: 1.15rem;
  margin-bottom: 0.95rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 5vw, 3.3rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.hero-highlight {
  background: linear-gradient(120deg, var(--accent), var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  margin: 0;
  color: var(--text-soft);
  font-size: 1.07rem;
  line-height: 1.7;
  max-width: 52ch;
}

.hero-cta-group {
  margin-top: 1.45rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.cta {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border-radius: 0.8rem;
  border: 1px solid transparent;
  min-height: 2.8rem;
  padding: 0.55rem 1rem;
  font-weight: 700;
  font-size: 0.94rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.cta:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.cta--primary {
  background: linear-gradient(128deg, var(--brand), var(--brand-2));
  color: #fff;
  box-shadow: 0 16px 30px color-mix(in srgb, var(--brand) 34%, transparent);
}

.cta--primary:hover {
  box-shadow: 0 20px 36px color-mix(in srgb, var(--brand) 42%, transparent);
}

.cta--secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--accent);
}

.metrics-grid {
  margin-top: 1.6rem;
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 640px;
}

.metrics-grid--duo {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: 420px;
}

.hero-note {
  margin: 1.25rem 0 0;
  max-width: 52ch;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--text-soft);
}

.section-lead a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.section-lead a:hover {
  color: var(--brand);
}

.metric-card {
  display: block;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.95rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.metric-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--brand) 45%, var(--border));
  text-decoration: none;
}

.metric-label {
  display: block;
  color: var(--text-soft);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.metric-value {
  margin-top: 0.25rem;
  display: block;
  font-family: "Space Grotesk", "IBM Plex Sans", sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text);
}

.authors-fold {
  margin-top: 1.5rem;
  max-width: 52ch;
  font-size: 0.875rem;
  color: var(--text-soft);
}

.authors-fold summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
  list-style: none;
}

.authors-fold summary::-webkit-details-marker {
  display: none;
}

.authors {
  margin: 0.75rem 0 0.35rem;
}

.affiliations {
  margin: 0;
  font-size: 0.82rem;
}

/* Cards & figures */
.feature-grid {
  margin-top: 1.35rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.95rem;
}

.feature-grid--three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 1rem;
  padding: 1.2rem;
  box-shadow: var(--shadow);
  transition: transform 0.28s var(--ease-out), border-color 0.28s ease, box-shadow 0.28s ease;
}

.card--accent {
  position: relative;
  overflow: hidden;
}

.card--accent::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-accent, var(--brand));
  opacity: 0.85;
  transition: height 0.25s ease;
}

.card--accent[data-accent="context"] {
  --card-accent: #c45a7a;
}

.card--accent[data-accent="compression"] {
  --card-accent: #a84d8f;
}

.card--accent[data-accent="spatial"] {
  --card-accent: #84354e;
}

.card--accent[data-accent="ssm"] {
  --card-accent: #d97498;
}

.card--accent:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--card-accent) 45%, var(--border));
  box-shadow: 0 18px 40px color-mix(in srgb, var(--card-accent) 14%, transparent);
}

.card--accent:hover::before {
  height: 4px;
}

.card-icon {
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 0.55rem;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--card-accent, var(--brand)) 12%, var(--surface));
  color: var(--card-accent, var(--brand));
}

.card-icon svg {
  width: 1.15rem;
  height: 1.15rem;
}

.card h3 {
  margin: 0.75rem 0 0.55rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.1rem;
}

.card p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.65;
  font-size: 0.92rem;
}

.bullet-list {
  margin: 1rem 0 1.25rem;
  padding-left: 1.25rem;
  color: var(--text-soft);
  line-height: 1.65;
}

.bullet-list li {
  margin-bottom: 0.4rem;
}

.section-figure {
  margin: 1.5rem auto 0;
  text-align: center;
  max-width: var(--figure-max);
}

[data-zoomable] {
  cursor: zoom-in;
}

.section-figure img {
  width: 100%;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s ease;
}

[data-zoomable]:hover img {
  transform: scale(1.012);
  box-shadow: var(--shadow-lg);
}

.section-figure figcaption {
  margin-top: 0.65rem;
  font-size: 0.84rem;
  color: var(--text-soft);
}

.zoom-hint {
  display: inline-block;
  margin-left: 0.35rem;
  font-size: 0.75rem;
  color: color-mix(in srgb, var(--brand) 70%, var(--text-soft));
  opacity: 0;
  transition: opacity 0.2s ease;
}

[data-zoomable]:hover .zoom-hint {
  opacity: 1;
}

/* Qual viewer */
.qual-viewer {
  margin-top: 1.25rem;
  max-width: var(--figure-max);
  margin-inline: auto;
}

.qual-stage {
  margin: 0 0 0.85rem;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.qual-stage__media {
  position: relative;
  overflow: hidden;
  border-radius: 0.65rem;
  aspect-ratio: 16 / 9;
  background: color-mix(in srgb, var(--surface-2) 60%, var(--surface));
}

.qual-stage img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 0.65rem;
  transition: opacity 0.35s ease, transform 0.35s var(--ease-out);
}

.qual-stage img.is-fading {
  opacity: 0;
  transform: scale(0.985);
}

.qual-stage figcaption {
  margin-top: 0.55rem;
  font-size: 0.84rem;
  color: var(--text-soft);
  text-align: center;
}

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

.qual-chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  background: var(--surface);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-soft);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.qual-chip.is-active,
.qual-chip:hover {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}

.qual-chip {
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s var(--ease-out);
}

.qual-chip:active {
  transform: scale(0.97);
}

.demo-grid {
  margin: 1.3rem auto 0;
  max-width: 980px;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.75rem;
}

.demo-grid__label {
  grid-column: 1 / -1;
  margin: 0.35rem 0 -0.25rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.95rem;
  color: var(--text);
  text-align: left;
}

.demo-grid figure {
  margin: 0;
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.demo-grid img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0.55rem;
  background: var(--surface-2);
}

.demo-grid figcaption {
  margin-top: 0.45rem;
  text-align: center;
  color: var(--text-soft);
  font-size: 0.76rem;
  font-weight: 700;
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: rgba(25, 18, 24, 0.72);
  backdrop-filter: blur(8px);
  animation: lightboxIn 0.25s ease;
}

.lightbox[hidden] {
  display: none;
}

.lightbox__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease;
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.22);
}

.lightbox__inner {
  margin: 0;
  max-width: min(1100px, 96vw);
  max-height: 90vh;
}

.lightbox__inner img {
  max-width: 100%;
  max-height: calc(90vh - 3rem);
  margin: 0 auto;
  border-radius: 0.75rem;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.35);
}

.lightbox__inner figcaption {
  margin-top: 0.75rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.9rem;
}

@keyframes lightboxIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* News & roadmap */
.updates-grid {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr minmax(220px, 0.85fr);
  gap: 1.25rem;
  align-items: start;
}

.community-panel .wechat-qr {
  margin: 0.75rem 0 0;
}

.community-panel {
  overflow: visible;
}

.wechat-qr {
  margin: 0.75rem auto 0;
  padding: 0;
  text-align: center;
  overflow: visible;
}

/* Portrait WeChat screenshot: set display width only; height follows intrinsic ratio (1166×1640). */
.wechat-qr__photo {
  display: block;
  width: 220px;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.developer-page .wechat-qr {
  margin: 1rem auto 0;
  overflow: visible;
}

.developer-page .wechat-qr__photo {
  width: 260px;
}

.wechat-qr figcaption {
  margin-top: 0.55rem;
  font-size: 0.82rem;
  color: var(--text-soft);
}

.lang-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.lang-toggle:hover {
  background: var(--surface-2);
  border-color: var(--brand-2);
}

.action-btn--ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--accent);
}

.action-btn--ghost:hover {
  background: var(--surface-2);
}

.page-shell--doc {
  min-height: 100vh;
}

.top-nav--doc {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 252, 253, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.dev-main {
  padding: 2rem 1rem 3rem;
  max-width: 52rem;
  min-width: 0;
  box-sizing: border-box;
}

.top-nav__inner--doc {
  min-width: 0;
}

.action-btn--compact {
  white-space: nowrap;
  max-width: min(100%, 14rem);
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 640px) {
  .top-nav__inner--doc {
    gap: 0.45rem;
  }

  .action-btn--compact {
    max-width: 9.5rem;
    font-size: 0.74rem;
    padding: 0.35rem 0.5rem;
  }

  .lang-toggle {
    font-size: 0.72rem;
    padding: 0.3rem 0.55rem;
  }
}

.dev-section {
  margin-top: 1rem;
  padding: 1.15rem 1.25rem;
  overflow: visible;
  min-width: 0;
}

.dev-skills-title {
  margin: 1rem 0 0.5rem;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--accent);
}

.dev-section--accent {
  border-color: color-mix(in srgb, var(--brand) 35%, var(--border));
  background: color-mix(in srgb, var(--brand) 4%, var(--surface));
}

.dev-table-wrap {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  margin-top: 0.5rem;
}

.dev-table {
  width: 100%;
  min-width: 28rem;
  border-collapse: collapse;
  font-size: 0.84rem;
}

.dev-table th,
.dev-table td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.55rem;
  text-align: left;
  vertical-align: top;
  word-break: break-word;
}

.dev-table th {
  background: var(--surface-2);
  color: var(--accent);
  font-weight: 600;
}

.dev-table code {
  font-size: 0.82em;
  word-break: break-all;
}

.dev-section .code-block {
  max-width: 100%;
  box-sizing: border-box;
}

.code-block--prompt {
  font-size: 0.78rem;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.dev-title {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  margin: 0 0 0.75rem;
  color: var(--accent);
}

.dev-section h2 {
  margin: 0 0 0.65rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.05rem;
  color: var(--accent);
}

.dev-section p,
.dev-section li {
  color: var(--text-soft);
  line-height: 1.6;
}

.dev-repo-link {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.updates-panel {
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1.2rem 1.25rem;
}

.updates-heading {
  margin: 0 0 0.85rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.05rem;
  color: var(--accent);
}

.news-feed {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.news-item {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0.75rem;
  padding-left: 0.65rem;
  border-left: 2px solid color-mix(in srgb, var(--brand) 35%, var(--border));
}

.news-item time {
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--brand);
  white-space: nowrap;
}

.news-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-soft);
}

.news-item a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.news-item code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  padding: 0.1rem 0.35rem;
  border-radius: 0.35rem;
  background: color-mix(in srgb, var(--brand) 8%, var(--surface-2));
}

.todo-groups {
  display: grid;
  gap: 0.85rem;
}

.todo-group h4 {
  margin: 0 0 0.45rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.todo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.todo-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-soft);
}

.todo-check {
  flex-shrink: 0;
  width: 0.95rem;
  height: 0.95rem;
  margin-top: 0.2rem;
  border: 1.5px solid color-mix(in srgb, var(--brand) 55%, var(--border));
  border-radius: 0.22rem;
  background: color-mix(in srgb, var(--brand) 6%, var(--surface));
}

.todo-list li.is-done {
  color: color-mix(in srgb, var(--text) 72%, var(--text-soft));
}

.todo-check.is-done {
  border-color: var(--brand);
  background: var(--brand);
  position: relative;
}

.todo-check.is-done::after {
  content: "";
  position: absolute;
  left: 0.18rem;
  top: 0.12rem;
  width: 0.35rem;
  height: 0.55rem;
  border: solid #fff;
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

/* BibTeX */
.pub-meta {
  display: grid;
  gap: 0.55rem;
  margin: 1.25rem 0 1.75rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  box-shadow: var(--shadow);
  max-width: 36rem;
}

.pub-meta__row {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  font-size: 0.9rem;
}

.pub-meta dt {
  margin: 0;
  font-weight: 600;
  color: var(--text-soft);
}

.pub-meta dd {
  margin: 0;
  color: var(--text);
}

.pub-meta a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.bibtex-heading {
  margin: 1.5rem 0 0.65rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.cite-switcher {
  margin-top: 1.25rem;
  max-width: 52rem;
}

.cite-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.cite-chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  background: var(--surface);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-soft);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.cite-chip.is-active,
.cite-chip:hover {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}

.cite-panel {
  animation: citeFadeIn 0.25s ease;
}

@keyframes citeFadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.bibtex-wrap {
  position: relative;
  margin-top: 1rem;
  width: 100%;
  max-width: 52rem;
  margin-inline: auto;
  text-align: left;
}

.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 1;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 0.45rem;
  padding: 0.25rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.copy-btn:hover {
  border-color: color-mix(in srgb, var(--brand) 50%, var(--border));
}

.copy-btn.is-copied {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}

.bibtex {
  margin: 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.5;
  overflow-x: auto;
}

.bibtex code {
  font-family: inherit;
}

/* Footer */
.footer {
  position: relative;
  padding: 2rem 0 2.5rem;
  background: color-mix(in srgb, var(--surface) 75%, transparent);
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(1120px, calc(100% - 2rem));
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in srgb, var(--brand) 18%, var(--border)) 18%,
    color-mix(in srgb, var(--brand) 18%, var(--border)) 82%,
    transparent 100%
  );
  opacity: 0.85;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-copy {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links a {
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 1180px) {
  .nav-links .nav-link {
    padding: 0.3rem 0.32rem;
    font-size: 0.76rem;
  }

  .action-btn--ghost {
    display: none;
  }
}

@media (max-width: 1080px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .slide-dots {
    display: none;
  }
}

@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .feature-grid--three {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .demo-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .updates-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .top-nav__inner {
    padding: 0.65rem 0;
    min-height: auto;
  }

  .lang-toggle {
    font-size: 0.72rem;
    padding: 0.3rem 0.55rem;
  }

  .metrics-grid,
  .metrics-grid--duo,
  .feature-grid,
  .feature-grid--three,
  .demo-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3.4rem 0;
  }

  .hero-cta-group .cta {
    width: 100%;
  }

  .footer-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0 1.5rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
}

.ckpt-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.ckpt-table th,
.ckpt-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.ckpt-table th {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface) 88%, var(--accent) 12%);
}

.ckpt-table tbody tr:last-child td {
  border-bottom: none;
}

.ckpt-table code {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.78rem;
  word-break: break-all;
}

.code-block-wrap {
  margin: 1rem 0;
}

.code-block-label {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
}

.code-block {
  margin: 0;
  padding: 0.9rem 1rem;
  border-radius: 0.65rem;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, #000 8%);
  overflow-x: auto;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.82rem;
  line-height: 1.5;
}

.section-note {
  margin-top: 1rem;
  font-size: 0.92rem;
  color: var(--muted);
  max-width: 42rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
    scroll-snap-type: none;
  }

  .ambient-orb,
  .ambient-shimmer,
  .page-shell::before {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .ambient-orb {
    opacity: 0.35;
  }

  .cta:hover,
  .metric-card:hover,
  .action-btn:hover,
  .card--accent:hover,
  [data-zoomable]:hover img,
  .back-top:hover {
    transform: none;
  }
}