:root {
  --navy: #001329;
  --navy-2: #0a2440;
  --cyan: #38bdf8;
  --text: #1e293b;
  --muted: #64748b;
  --bg: #f8fafc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
header {
  background: linear-gradient(160deg, var(--navy), var(--navy-2));
  color: #fff;
  padding: 40px 20px 32px;
  text-align: center;
}
header h1 { margin: 0 0 6px; font-size: 1.9rem; }
header p { margin: 0; color: #b7d3e8; }
nav { margin-top: 18px; }
nav a {
  color: var(--cyan);
  text-decoration: none;
  margin: 0 12px;
  font-weight: 600;
}
nav a:hover { text-decoration: underline; }
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 36px 20px 60px;
}
main h2 { color: var(--navy); margin-top: 2em; }
main h2:first-child { margin-top: 0; }
.effective { color: var(--muted); font-style: italic; }
.warn {
  background: #fef3c7;
  border-left: 4px solid #f59e0b;
  padding: 12px 16px;
  border-radius: 6px;
}
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 24px 20px 40px;
}
footer a { color: var(--navy); }
.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 20px 24px;
  margin: 16px 0;
}