:root {
  --bg: #f5efe6;
  --surface: #fffbf5;
  --ink: #2a211a;
  --ink-2: rgba(42, 33, 26, 0.66);
  --stroke: rgba(42, 33, 26, 0.1);
  --accent: #b5652b;
  --on-accent: #fffbf5;
  --sage: #5e7d66;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17130f;
    --surface: #221c17;
    --ink: #f4ece1;
    --ink-2: rgba(244, 236, 225, 0.66);
    --stroke: rgba(244, 236, 225, 0.1);
    --accent: #e5a35c;
    --on-accent: #1b140e;
    --sage: #93b59a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 640px; margin: 0 auto; padding: 32px 16px 64px; }
h1, h2 { font-family: "New York", ui-serif, Georgia, serif; font-weight: 600; line-height: 1.15; }
h1 { font-size: 2.2rem; margin: 0.3em 0 0.4em; }
a { color: var(--accent); }
.brand { font-family: "New York", ui-serif, Georgia, serif; font-weight: 600; color: var(--ink-2); text-decoration: none; }
.lede { font-size: 1.15rem; color: var(--ink-2); }
.card { background: var(--surface); border: 1px solid var(--stroke); border-radius: 20px; padding: 20px; margin: 20px 0; }
.tag { display: inline-block; margin: 0; padding: 4px 10px; border-radius: 999px; background: color-mix(in srgb, var(--sage) 15%, transparent); color: var(--sage); font-size: 0.85rem; font-weight: 600; }
blockquote { margin: 0 0 16px; padding: 12px 16px; border-radius: 14px; background: color-mix(in srgb, var(--sage) 12%, transparent); font-style: italic; }
ol.exercises { padding-left: 1.4em; margin: 0; }
ol.exercises li { padding: 10px 0; border-bottom: 1px solid var(--stroke); }
ol.exercises li:last-child { border-bottom: none; }
ol.exercises strong { display: block; }
ol.exercises span { color: var(--ink-2); font-size: 0.92rem; }
.hint { color: var(--ink-2); font-size: 0.95rem; }
.buttons { display: grid; gap: 12px; margin-top: 8px; }
.button { display: block; text-align: center; padding: 16px; border-radius: 16px; font-weight: 600; text-decoration: none; }
.button.primary { background: var(--accent); color: var(--on-accent); }
.button.secondary { border: 1px solid var(--stroke); background: var(--surface); color: var(--ink); }
footer { margin-top: 40px; color: var(--ink-2); font-size: 0.85rem; }
footer a { color: inherit; }