:root {
  --bg: #f7f7fb;
  --surface: #ffffff;
  --text: #1d1f2b;
  --muted: #5d6275;
  --accent: #1f8a70;
  --border: #e3e5ee;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141d;
    --surface: #1b1e2a;
    --text: #e8e9f0;
    --muted: #a3a8bb;
    --accent: #5fd3b0;
    --border: #2c3040;
  }
}

* { box-sizing: border-box; }

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

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 1.25rem; margin: 36px 0 8px; }
h3 { font-size: 1.05rem; margin: 20px 0 6px; }
ul { padding-left: 1.3em; }
li { margin: 4px 0; }

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

.meta, .back { color: var(--muted); font-size: 0.9rem; }
.back a { text-decoration: none; }

.summary {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 14px 16px;
}

.home { text-align: center; padding-top: 18vh; }
.home h1 { font-size: 2.6rem; }
.lead { color: var(--muted); font-size: 1.1rem; }

.button {
  display: inline-block;
  margin: 16px 0 28px;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  text-decoration: none;
}

nav { color: var(--muted); display: flex; gap: 10px; justify-content: center; }