:root {
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --heading: #0b1220;
  --primary: #10b981;
  --accent: #06b6d4;
  --border: #e5e7eb;
  --card: #f9fafb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

.header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  padding-bottom: 20px;
}

.brand {
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.2px;
}

h1, h2, h3 {
  color: var(--heading);
  line-height: 1.3;
}

h1 {
  font-size: 32px;
  margin-bottom: 8px;
}

h2 {
  margin-top: 36px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}

.updated {
  color: var(--muted);
  font-size: 14px;
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  text-decoration: underline;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin: 16px 0;
}

ul {
  padding-left: 24px;
}

.footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.nav a {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #ffffff;
}

.notice {
  background: #ecfeff;
  border: 1px solid #a5f3fc;
  border-radius: 14px;
  padding: 16px;
}