:root {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color-scheme: light dark;
  background: #080b11;
  color: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(2rem, 6vw, 5rem) clamp(1.5rem, 4vw, 3rem);
  background: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.2), transparent 55%),
              radial-gradient(circle at 80% 0%, rgba(99, 102, 241, 0.25), transparent 60%),
              linear-gradient(160deg, #0f172a, #020617 70%);
}

main {
  width: min(1100px, 100%);
  display: grid;
  gap: clamp(1.8rem, 4vw, 2.6rem);
  background: rgba(15, 23, 42, 0.82);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 22px;
  padding: clamp(2rem, 6vw, 4rem);
  box-shadow: 0 40px 120px rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(16px);
}

header {
  display: grid;
  gap: 0.8rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(148, 163, 184, 0.8);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.15;
  font-weight: 700;
  color: #f8fafc;
}

.intro {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.7;
  color: rgba(226, 232, 240, 0.88);
  max-width: 60ch;
}

.status-strip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(20, 30, 48, 0.7);
  border: 1px solid rgba(51, 65, 85, 0.5);
  font-size: 0.85rem;
  color: rgba(148, 163, 184, 0.95);
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: linear-gradient(120deg, #34d399, #22c55e);
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.15);
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(1.2rem, 3vw, 1.8rem);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.6rem;
  border-radius: 18px;
  background: linear-gradient(160deg, rgba(15, 23, 42, 0.95), rgba(30, 41, 59, 0.85));
  border: 1px solid rgba(148, 163, 184, 0.16);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(94, 234, 212, 0.5);
  box-shadow: 0 25px 60px rgba(14, 165, 233, 0.25);
}

.badge {
  align-self: flex-start;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.16);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: #7dd3fc;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.card h2 {
  margin: 0;
  font-size: 1.35rem;
  color: #f1f5f9;
}

.card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(203, 213, 225, 0.9);
}

.card footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.88rem;
  color: rgba(148, 163, 184, 0.95);
}

.card a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.1rem;
  border-radius: 12px;
  background: linear-gradient(130deg, #38bdf8, #2563eb);
  color: #f8fafc;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 18px 35px rgba(37, 99, 235, 0.28);
}

.card a:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 40px rgba(37, 99, 235, 0.35);
}

.cta-section {
  display: grid;
  gap: 0.8rem;
  padding: 1.6rem;
  border-radius: 18px;
  background: linear-gradient(150deg, rgba(17, 24, 39, 0.92), rgba(30, 58, 138, 0.75));
  border: 1px solid rgba(99, 102, 241, 0.28);
  text-align: center;
}

.cta-section h3 {
  margin: 0;
  font-size: 1.2rem;
  color: #eef2ff;
}

.cta-section p {
  margin: 0;
  font-size: 0.95rem;
  color: rgba(199, 210, 254, 0.88);
}

footer.page-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: rgba(148, 163, 184, 0.85);
}

footer.page-footer a {
  color: rgba(96, 165, 250, 0.9);
  text-decoration: none;
}

@media (max-width: 640px) {
  body {
    padding: 1.5rem;
  }

  main {
    padding: clamp(1.4rem, 4vw, 2rem);
  }

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

/* Notebook home: scoped so existing demos retain their presentation. */
.lab-home {
  --notebook-bg: #f7f8fa;
  --notebook-ink: #172326;
  --notebook-muted: #657078;
  --notebook-line: #dce2e5;
  --notebook-accent: #176b58;
  color-scheme: light;
  display: block;
  min-height: 100vh;
  padding: 0 32px;
  background: var(--notebook-bg);
  color: var(--notebook-ink);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
.lab-home [hidden] { display: none !important; }
.lab-home a { color: inherit; text-decoration: none; }
.lab-home button, .lab-home input { font: inherit; }
.lab-home :is(a, button, input):focus-visible { outline: 2px solid var(--notebook-accent); outline-offset: 5px; }
.lab-home .lab-nav {
  max-width: 1120px;
  margin: 0 auto;
  height: 82px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--notebook-line);
  font-size: 14px;
}
.lab-home .lab-brand { font-size: 19px; font-weight: 650; letter-spacing: -.5px; }
.lab-home .lab-brand span { color: var(--notebook-accent); font-weight: 400; }
.lab-home .lab-nav > a:last-child { color: var(--notebook-muted); }
.lab-home .lab-main {
  display: block;
  width: min(1120px, 100%);
  margin: auto;
  padding: 0;
  background: none;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  backdrop-filter: none;
}
.lab-home .lab-hero { display: block; padding: 54px 0 42px; }
.lab-home h1 { color: var(--notebook-ink); font-size: clamp(26px, 3.2vw, 36px); font-weight: 650; line-height: 1.4; letter-spacing: -1px; }
.lab-home .lab-hero p { margin: 12px 0 0; color: var(--notebook-muted); font-size: 15px; line-height: 1.8; }
.lab-home .directory { scroll-margin-top: 24px; }
.lab-home .directory-heading { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 18px; }
.lab-home .directory-heading h2 { font-size: 20px; margin: 0; font-weight: 650; }
.lab-home .result-count { color: var(--notebook-muted); font-size: 13px; }
.lab-home .project-search { display: flex; align-items: center; gap: 12px; border: 1px solid var(--notebook-line); border-radius: 6px; padding: 0 16px; height: 48px; background: #fff; color: var(--notebook-muted); }
.lab-home .project-search:focus-within { border-color: var(--notebook-accent); box-shadow: 0 0 0 2px #176b5810; }
.lab-home .project-search input { width: 100%; min-width: 0; height: 100%; border: 0; background: transparent; outline: none; color: var(--notebook-ink); font-size: 14px; }
.lab-home .project-search input::placeholder { color: var(--notebook-muted); }
.lab-home .category-filters { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 28px; }
.lab-home .category-filters button { cursor: pointer; background: transparent; border: 1px solid var(--notebook-line); border-radius: 6px; padding: 9px 16px; color: var(--notebook-ink); font-size: 13px; transition: background .15s, border-color .15s; }
.lab-home .category-filters button span { padding-left: 10px; color: var(--notebook-muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.lab-home .category-filters button:hover { border-color: var(--notebook-accent); }
.lab-home .category-filters button[aria-pressed="true"] { background: var(--notebook-accent); border-color: var(--notebook-accent); color: #fff; }
.lab-home .category-filters button[aria-pressed="true"] span { color: #e1eee8; }
.lab-home .demo-grid { display: block; }
.lab-home .project-group { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 30px; padding: 8px 0 20px; border-top: 1px solid var(--notebook-line); }
.lab-home .group-heading { display: block; padding-top: 21px; }
.lab-home .group-heading h3 { margin: 0; font-size: 20px; font-weight: 650; letter-spacing: -.3px; }
.lab-home .group-heading p { font-size: 13px; line-height: 1.8; margin: 10px 0 0; color: var(--notebook-muted); }
.lab-home .project-row { border-bottom: 1px solid var(--notebook-line); }
.lab-home .project-row:last-child { border-bottom: 0; }
.lab-home .project-row > a { display: grid; grid-template-columns: 32px minmax(0, 1fr) 104px 24px; align-items: center; gap: 14px; padding: 21px 6px; transition: background .15s; }
.lab-home .project-row > a:hover { background: #edf2f0; }
.lab-home .project-row > a:hover h4, .lab-home .project-row > a:hover .project-arrow { color: var(--notebook-accent); }
.lab-home .project-number { align-self: start; padding-top: 3px; font-size: 12px; color: var(--notebook-muted); font-variant-numeric: tabular-nums; }
.lab-home .project-copy { min-width: 0; }
.lab-home .project-copy h4 { margin: 0; font-size: 16px; line-height: 1.5; font-weight: 600; }
.lab-home .project-copy p { margin: 6px 0 0; font-size: 13px; line-height: 1.7; color: var(--notebook-muted); }
.lab-home .project-topic { text-align: right; font-size: 12px; line-height: 1.6; color: var(--notebook-muted); }
.lab-home .project-arrow { font-size: 22px; text-align: right; font-weight: 400; }
.lab-home .lab-footer { display: flex; justify-content: space-between; border-top: 1px solid var(--notebook-line); padding: 24px 0 32px; color: var(--notebook-muted); font-size: 12px; }
.lab-home .empty-state { padding: 60px 20px 80px; text-align: center; border-top: 1px solid var(--notebook-line); }
.lab-home .empty-state h3 { font-size: 19px; font-weight: 600; }
.lab-home .empty-state p { color: var(--notebook-muted); font-size: 14px; line-height: 1.8; }
.lab-home .empty-state button { background: var(--notebook-accent); color: #fff; border: 0; border-radius: 6px; padding: 11px 18px; cursor: pointer; }
.lab-home .visually-hidden, .lab-home .skip-link:not(:focus) { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.lab-home .skip-link:focus { display: block; padding: 12px; }
@media (max-width: 850px) {
  .lab-home .project-group { grid-template-columns: 165px minmax(0, 1fr); gap: 20px; }
  .lab-home .project-row > a { grid-template-columns: 24px minmax(0, 1fr) 20px; gap: 10px; }
  .lab-home .project-topic { display: none; }
}
@media (max-width: 600px) {
  .lab-home { padding: 0 20px; }
  .lab-home .lab-nav { height: 68px; }
  .lab-home .lab-brand { font-size: 17px; }
  .lab-home .lab-hero { padding: 34px 0; }
  .lab-home .category-filters { gap: 8px; margin-bottom: 22px; }
  .lab-home .category-filters button { padding: 10px 12px; }
  .lab-home .project-group { grid-template-columns: minmax(0, 1fr); gap: 4px; padding-bottom: 16px; }
  .lab-home .group-heading { padding-top: 20px; }
  .lab-home .group-heading h3 { font-size: 18px; }
  .lab-home .group-heading p { margin: 5px 0 0; }
  .lab-home .group-heading br { display: none; }
  .lab-home .project-row > a { padding: 18px 0; }
  .lab-home .project-copy h4 { font-size: 15px; }
  .lab-home .lab-footer { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .lab-home *, .lab-home *::before, .lab-home *::after { transition: none !important; scroll-behavior: auto !important; }
}