:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1b1f23;
  --muted: #5b6573;
  --card: #f6f8fa;
  --border: #d0d7de;
  --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9aa4b2;
    --card: #161b22;
    --border: #30363d;
    --accent: #6ea8fe;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 28%),
    linear-gradient(180deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 94%, #dbeafe 6%) 100%);
  color: var(--fg);
  line-height: 1.65;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 20px 72px;
}

header {
  margin-bottom: 32px;
  padding: 24px;
  background: color-mix(in srgb, var(--card) 86%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 88%, transparent);
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(18px);
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4vw, 2.75rem);
}

h2 {
  margin-top: 36px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 1.35rem;
}

h3 {
  margin-top: 24px;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

p,
li {
  font-size: 1rem;
}

.meta {
  color: var(--muted);
  margin: 0;
}

.badge {
  display: inline-block;
  margin-top: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
}

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

.section-copy {
  color: var(--fg);
  max-width: 72ch;
}

.lead {
  margin-top: 8px;
  color: var(--muted);
}

ul {
  padding-left: 1.25rem;
}

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

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.08rem 0.35rem;
}

footer {
  margin-top: 44px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  main {
    padding: 32px 16px 56px;
  }

  header {
    padding: 20px;
    border-radius: 18px;
  }

  h2 {
    font-size: 1.2rem;
  }
}