:root {
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-2: #1d4ed8;
  --border: #e5e7eb;
  --ok: #065f46;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header {
  background: linear-gradient(135deg, #111827, #1f2937);
  color: #fff;
  padding: 18px 20px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.nav {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}
.nav .brand {
  font-weight: 700;
  margin-right: auto;
  color: #fff;
}
.nav a {
  color: rgba(255,255,255,.92);
  font-weight: 500;
}
main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 28px 20px 56px;
}
.hero {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px;
  box-shadow: 0 8px 22px rgba(17,24,39,.05);
}
.hero h1 { margin-top: 0; line-height: 1.15; }
.hero p { max-width: 760px; }
.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}
.button {
  display: inline-block;
  padding: 11px 16px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.button:hover { background: var(--accent-2); text-decoration: none; }
.button.secondary {
  background: #eef2ff;
  color: var(--accent-2);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 8px 22px rgba(17,24,39,.04);
}
.card h2, .card h3 { margin-top: 0; }
section { margin-top: 26px; }
.meta {
  color: var(--muted);
  font-size: .95rem;
}
.notice {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e3a8a;
  padding: 14px 16px;
  border-radius: 12px;
}
.good {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: var(--ok);
  padding: 14px 16px;
  border-radius: 12px;
}
ul, ol { padding-left: 22px; }
footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px 40px;
  color: var(--muted);
}
.footer-inner {
  max-width: 1000px;
  margin: 0 auto;
}
small.code {
  display: inline-block;
  background: #f3f4f6;
  padding: 2px 8px;
  border-radius: 999px;
  color: #374151;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
}
th, td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
th { background: #f9fafb; }
tr:last-child td { border-bottom: none; }
@media (max-width: 640px) {
  .hero { padding: 24px; }
  header { padding: 14px 16px; }
  main { padding: 20px 16px 48px; }
}