/* Chăm Luyện site: one small stylesheet, light and dark. */
:root {
  --bg: #f1faf4;
  --card: #ffffff;
  --ink: #14261c;
  --muted: #4f6658;
  --accent: #11753f;
  --line: #d3ecdc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1a14;
    --card: #17261d;
    --ink: #eef8f1;
    --muted: #a9c4b3;
    --accent: #5fd394;
    --line: #27402f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 48px 20px 80px;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; }
.hero { text-align: center; margin-bottom: 40px; }
.icon {
  width: 112px; height: 112px; margin: 0 auto 14px; display: block;
  filter: drop-shadow(0 10px 22px rgba(34, 184, 101, 0.28));
}
h1 { font-size: 34px; margin: 0 0 6px; letter-spacing: -0.4px; }
.tagline { color: var(--muted); margin: 0; font-size: 18px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px 26px;
  margin-bottom: 18px;
}
h2 { font-size: 20px; margin: 0 0 12px; }
h3 { font-size: 16px; margin: 22px 0 6px; }
p, li { color: var(--ink); }
p.note, li.note { color: var(--muted); }
ul { padding-left: 22px; }
li { margin: 5px 0; }
a { color: var(--accent); }
nav.links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
nav.links a {
  text-decoration: none; font-weight: 500;
  border: 1px solid var(--line); background: var(--card);
  padding: 9px 16px; border-radius: 999px;
}
footer { text-align: center; color: var(--muted); font-size: 14px; margin-top: 34px; }
footer a { color: var(--muted); }