:root {
  --bg: #0b1020;
  --panel: #121935;
  --panel-soft: #161f43;
  --text: #eef2ff;
  --muted: #b6c0e0;
  --accent: #7c9cff;
  --accent-2: #60e0c3;
  --border: rgba(255,255,255,0.08);
  --shadow: 0 20px 60px rgba(0,0,0,0.3);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background:
    radial-gradient(circle at top, rgba(124,156,255,0.16), transparent 30%),
    linear-gradient(180deg, #0b1020 0%, #0e1430 100%);
  color: var(--text);
  line-height: 1.7;
}

a { color: inherit; }
code, pre { font-family: "JetBrains Mono", monospace; }

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

.hero {
  padding: 5rem 0 3rem;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.05;
  margin: 0 0 1rem;
  max-width: 12ch;
}

.lead {
  max-width: 52rem;
  color: var(--muted);
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.15rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  text-decoration: none;
  font-weight: 600;
}

.button.primary {
  background: linear-gradient(135deg, var(--accent), #9f79ff);
  color: white;
  border-color: transparent;
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
  padding-bottom: 4rem;
}

.toc {
  position: sticky;
  top: 1.25rem;
}

.toc-card,
.card {
  background: rgba(18, 25, 53, 0.82);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.toc-card {
  padding: 1.25rem;
}

.toc-card h2 {
  font-size: 1rem;
  margin-top: 0;
}

.toc-card nav {
  display: grid;
  gap: 0.7rem;
}

.toc-card a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}

.toc-card a:hover { color: var(--text); }

.content {
  display: grid;
  gap: 1.25rem;
}

.card {
  padding: 1.5rem;
}

.intro {
  background: linear-gradient(180deg, rgba(124,156,255,0.15), rgba(18,25,53,0.92));
}

.section-label {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.7rem;
}

h2, h3, h4 {
  line-height: 1.2;
  margin-top: 0;
}

ul { padding-left: 1.2rem; }

.checklist li { margin-bottom: 0.5rem; }

pre {
  background: #0a0f22;
  border: 1px solid rgba(255,255,255,0.06);
  padding: 1rem;
  border-radius: 16px;
  overflow-x: auto;
  color: #dce6ff;
}

code {
  background: rgba(255,255,255,0.06);
  border-radius: 0.45rem;
  padding: 0.15rem 0.35rem;
}

pre code {
  background: transparent;
  padding: 0;
}

.note,
.result {
  border-radius: 18px;
  padding: 1rem 1rem 0.85rem;
  border: 1px solid var(--border);
}

.note.warning {
  background: rgba(255, 190, 92, 0.08);
}

.result {
  background: rgba(124,156,255,0.08);
}

.result.success {
  background: rgba(96, 224, 195, 0.08);
}

.result span {
  font-weight: 700;
}

.grid.two-up {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 1.25rem 0 2rem;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

  .grid.two-up {
    grid-template-columns: 1fr;
  }
}