:root {
  --brand: #4060a8;
  --ink: #204088;
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e5e7eb;
  --muted: #64748b;
  --text: #111827;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 18px;
}

.top {
  background: linear-gradient(135deg, var(--brand), var(--ink));
  color: #fff;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.logo {
  color: #fff;
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
  letter-spacing: 0.2px;
}

nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

nav a {
  color: rgba(255,255,255,0.88);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 8px;
}

nav a.active,
nav a:hover {
  background: rgba(255,255,255,0.16);
  color: #fff;
}

.hero {
  padding: 28px 0 12px;
}

.hero h1 {
  margin: 0 0 6px;
  font-size: 1.75rem;
  color: var(--ink);
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  margin-bottom: 12px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--ink);
}

.card p, .card li {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

.card ol {
  margin: 0;
  padding-left: 1.2rem;
}

.card a { color: var(--brand); font-weight: 600; }

.card.so {
  border-color: rgba(64, 96, 168, 0.25);
  background: #f8fafc;
}

.foot {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 18px 0 40px;
}

@media (max-width: 520px) {
  .hero h1 { font-size: 1.45rem; }
}