:root {
  --bg: #ffffff;
  --text: #1c1d21;
  --muted: #5b5f6b;
  --accent: #2f6bff;
  --card: #f4f6fa;
  --border: #e3e6ee;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --text: #e8eaf0;
    --muted: #a3a8b5;
    --accent: #7aa2ff;
    --card: #1b1e24;
    --border: #2a2e37;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

header { margin-bottom: 32px; }

.brand {
  display: inline-block;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 12px;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 36px 0 8px; }
h3 { font-size: 1.05rem; margin: 20px 0 4px; }

p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }

ul { padding-left: 1.25rem; }
li { margin: 4px 0; }

.summary {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 24px 0;
}
.summary h2 { margin-top: 0; }

.cards { display: grid; gap: 12px; margin-top: 24px; }
.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  color: var(--text);
  text-decoration: none;
}
.card strong { display: block; font-size: 1.1rem; color: var(--accent); }

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}