:root {
  color-scheme: light dark;
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #5f6b7a;
  --border: #d9e0ea;
  --accent: #0a84ff;
  --accent-dark: #0758b8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1118;
    --card: #121a24;
    --text: #eef4fb;
    --muted: #a6b3c2;
    --border: #263445;
    --accent: #5eb1ff;
    --accent-dark: #8cc8ff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.58;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

header {
  margin-bottom: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 {
  margin: 14px 0 8px;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
}

h2 {
  margin-top: 32px;
  font-size: 1.35rem;
}

h3 {
  margin-top: 24px;
  font-size: 1.05rem;
}

p, li {
  color: var(--muted);
}

a {
  color: var(--accent-dark);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
}

.updated {
  color: var(--muted);
  font-size: 0.95rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0;
}

.nav a {
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.callout {
  border-left: 4px solid var(--accent);
  padding: 12px 16px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border-radius: 12px;
  color: var(--text);
}

footer {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}