:root {
  --bg: #f4f6f4;
  --surface: #ffffff;
  --ink-900: #12201b;
  --ink-600: #47564f;
  --ink-400: #8a968f;
  --border: #dce3de;
  --accent: #1b6e58;
  --accent-soft: #e4f0ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1613;
    --surface: #16201c;
    --ink-900: #eaf1ec;
    --ink-600: #aebbb4;
    --ink-400: #6e7b74;
    --border: #263229;
    --accent: #4fbe9b;
    --accent-soft: #17332a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-900);
  font-family: ui-sans-serif, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
}
.page { max-width: 700px; margin: 0 auto; padding: 64px 24px 96px; }
.mark {
  width: 56px; height: 56px; border-radius: 14px;
  margin-bottom: 20px;
  display: block;
}
h1 { font-size: 26px; font-weight: 700; letter-spacing: -0.01em; margin: 0 0 6px; }
.updated { color: var(--ink-400); font-size: 14px; margin: 0 0 40px; }
h2 {
  font-size: 17px; font-weight: 700; margin: 40px 0 10px;
  padding-top: 20px; border-top: 1px solid var(--border);
}
h2:first-of-type { border-top: none; padding-top: 0; }
p, li { color: var(--ink-600); font-size: 15px; max-width: 62ch; }
ul { padding-left: 20px; margin: 10px 0; }
li { margin-bottom: 6px; }
strong { color: var(--ink-900); }
a { color: var(--accent); }
.callout {
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 16px 0;
}
.callout p { color: var(--ink-900); margin: 0; }
footer { margin-top: 56px; color: var(--ink-400); font-size: 13px; }
footer a { margin-left: 12px; }
footer p { color: var(--ink-400); font-size: 13px; margin: 8px 0 0; }
.nav-links { margin: 0 0 40px; }
.nav-links a { margin-right: 16px; font-size: 14px; }
.play-badge { display: inline-block; margin: 4px 0 28px; }
.play-badge img { height: 54px; width: auto; display: block; }