:root {
  color-scheme: dark;
  --bg: #040b16;
  --bg-elevated: rgba(9, 18, 36, 0.78);
  --bg-strong: #0d1830;
  --panel: rgba(15, 23, 42, 0.84);
  --panel-strong: #111c35;
  --border: rgba(148, 163, 184, 0.18);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #67e8f9;
  --accent-strong: #38bdf8;
  --success: #34d399;
  --warning: #fbbf24;
  --shadow: 0 30px 80px rgba(2, 6, 23, 0.42);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --container: min(1180px, calc(100% - 32px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(103, 232, 249, 0.18), transparent 28%),
    radial-gradient(circle at 85% 18%, rgba(59, 130, 246, 0.18), transparent 30%),
    radial-gradient(circle at bottom right, rgba(52, 211, 153, 0.12), transparent 24%),
    linear-gradient(180deg, #040b16 0%, #081120 36%, #07111e 100%);
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.page {
  width: var(--container);
  margin: 0 auto;
  padding: 24px 0 72px;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 20;
  margin-bottom: 28px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(4, 11, 22, 0.72);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.28), rgba(52, 211, 153, 0.24));
  color: var(--accent);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.nav-links,
.nav-actions,
.inline-actions,
.badge-row,
.pill-list,
.card-tags,
.topic-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav-links a,
.nav-actions a {
  text-decoration: none;
}

.nav-link {
  color: var(--muted);
  font-size: 0.95rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.72);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.button:hover,
.card:hover,
.jump-card:hover,
.topic-section:hover {
  transform: translateY(-2px);
}

.button.primary {
  color: #02101f;
  background: linear-gradient(135deg, var(--accent), #a5f3fc);
  border-color: transparent;
}

.button.secondary {
  background: rgba(9, 18, 36, 0.72);
}

.hero {
  display: grid;
  gap: 22px;
  padding: 28px 0 16px;
}

.hero-grid,
.split-grid,
.topic-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.95fr);
  gap: 20px;
}

.eyebrow,
.pill,
.topic-level,
.jump-label {
  display: inline-flex;
  width: fit-content;
  padding: 8px 12px;
  border: 1px solid rgba(103, 232, 249, 0.22);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(14, 165, 233, 0.08);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.hero h1,
.section-title {
  margin: 0;
  line-height: 1.04;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 5.2rem);
  max-width: 11ch;
}

.hero-copy,
.section-copy,
.card-copy,
.topic-copy,
.list,
.topic-list {
  color: var(--muted);
  line-height: 1.78;
}

.hero-copy {
  max-width: 72ch;
  margin: 0;
  font-size: 1.05rem;
}

.surface,
.card,
.jump-card,
.topic-section,
.code-card,
.hero-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.hero-panel,
.code-card,
.topic-section,
.jump-card,
.card {
  padding: 24px;
}

.hero-panel {
  display: grid;
  gap: 16px;
  background:
    linear-gradient(180deg, rgba(13, 24, 48, 0.92), rgba(10, 18, 36, 0.92)),
    linear-gradient(135deg, rgba(56, 189, 248, 0.16), rgba(52, 211, 153, 0.1));
}

.hero-panel h2,
.card h3,
.jump-card h3,
.topic-section h2,
.code-card h3 {
  margin: 0;
}

.stat-grid,
.card-grid,
.roadmap-grid,
.jump-grid,
.topic-grid,
.status-grid {
  display: grid;
  gap: 16px;
}

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

.card-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.roadmap-grid,
.jump-grid,
.topic-grid,
.status-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.stat,
.metric,
.step,
.card,
.jump-card {
  min-width: 0;
}

.metric-value,
.step-number {
  display: block;
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 800;
}

.metric-label,
.step-copy,
.card-meta,
.footer-copy {
  color: var(--muted);
}

.section {
  padding-top: 34px;
}

.section-head {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.card {
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.card:hover,
.jump-card:hover,
.topic-section:hover {
  border-color: rgba(103, 232, 249, 0.32);
  background: rgba(15, 23, 42, 0.94);
}

.card-title,
.topic-title {
  margin: 0 0 10px;
  font-size: 1.18rem;
}

.card-meta,
.topic-meta {
  margin-top: 16px;
  font-size: 0.92rem;
}

.pill-list,
.card-tags,
.topic-meta {
  padding: 0;
  margin: 0;
  list-style: none;
}

.pill {
  color: var(--text);
  border-color: rgba(148, 163, 184, 0.18);
  background: rgba(15, 23, 42, 0.58);
}

.list,
.topic-list {
  padding-left: 18px;
  margin: 0;
}

.list li,
.topic-list li {
  margin-bottom: 10px;
}

.code-card {
  background: linear-gradient(180deg, rgba(13, 24, 48, 0.92), rgba(10, 18, 36, 0.92));
}

.code-block {
  margin: 0;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: var(--radius-md);
  background: rgba(2, 6, 23, 0.72);
  color: #cbd5e1;
  font-size: 0.92rem;
  line-height: 1.7;
}

.status-good .topic-level {
  color: var(--success);
  border-color: rgba(52, 211, 153, 0.22);
  background: rgba(16, 185, 129, 0.08);
}

.status-watch .topic-level {
  color: var(--warning);
  border-color: rgba(251, 191, 36, 0.22);
  background: rgba(251, 191, 36, 0.08);
}

.footer {
  margin-top: 40px;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: rgba(9, 18, 36, 0.76);
}

.footer-title {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.topic-hero {
  display: grid;
  gap: 16px;
  padding: 22px 0 10px;
}

.jump-card {
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.jump-card p,
.topic-side p,
.hero-panel p {
  margin: 0;
  color: var(--muted);
  line-height: 1.72;
}

.topic-side {
  display: grid;
  gap: 14px;
}

.topic-side .surface {
  padding: 20px;
}

.topic-side h3 {
  margin: 0 0 8px;
}

@media (max-width: 980px) {
  .nav {
    border-radius: 28px;
  }

  .nav,
  .hero-grid,
  .split-grid,
  .topic-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page {
    width: min(100% - 20px, 1180px);
    padding-bottom: 56px;
  }

  .site-header {
    position: static;
  }

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

  .nav-links,
  .nav-actions,
  .inline-actions,
  .badge-row,
  .stat-grid {
    width: 100%;
  }

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

  .hero h1 {
    max-width: none;
  }
}