:root {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #f97316;
  --border: #334155;
}
* { box-sizing: border-box; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}
header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}
h1 {
  font-size: 2rem;
  margin: 0 0 0.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
h1 .accent { color: var(--accent); }
.effective {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0 0 0.5rem;
}
.nav-links {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0.5rem 0 0;
}
.nav-links a { color: var(--accent); text-decoration: none; }
.nav-links a:hover { text-decoration: underline; }
h2 {
  font-size: 1.25rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
  font-weight: 700;
}
h3 {
  font-size: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
p, li { color: var(--text); }
p { margin: 0.75rem 0; }
ul { padding-left: 1.25rem; }
li { margin: 0.4rem 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.toc h3 {
  margin-top: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.toc ol { margin: 0; padding-left: 1.25rem; }
.toc li { margin: 0.25rem 0; }
footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

/* Landing page styles */
body.landing {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #38bdf8 0%, #0284c7 100%);
  color: #fff;
  padding: 2rem 1rem;
}
.card {
  max-width: 480px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  text-align: center;
  backdrop-filter: blur(6px);
}
.card h1 {
  font-size: 3rem;
  margin: 0 0 0.5rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: #fff;
}
.card .tagline {
  color: rgba(255, 255, 255, 0.75);
  margin: 0 0 0.5rem;
}
.card .by {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  margin: 0 0 2rem;
}
.card .links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.card .links a {
  display: block;
  padding: 0.85rem 1.25rem;
  background: rgba(249, 115, 22, 0.9);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  border-radius: 12px;
  transition: transform 0.1s, background 0.15s;
}
.card .links a:hover { background: #f97316; transform: translateY(-1px); }
.card .links a.secondary {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.card .links a.secondary:hover { background: rgba(255, 255, 255, 0.2); }