:root {
  --bg: #fafaf7;
  --fg: #1d1d1b;
  --muted: #6b6b66;
  --accent: #2f5d50;
  --card: #ffffff;
  --line: #e4e2dc;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161614;
    --fg: #f2f1ec;
    --muted: #9b9a93;
    --accent: #7fbfa9;
    --card: #1f1f1c;
    --line: #33332f;
  }
}
:root[data-theme="dark"] {
  --bg: #161614;
  --fg: #f2f1ec;
  --muted: #9b9a93;
  --accent: #7fbfa9;
  --card: #1f1f1c;
  --line: #33332f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
}
main { max-width: 960px; margin: 0 auto; padding: 0 16px; }
header, footer { padding: 24px 0; }
h1 { font-size: 2rem; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 0 0 8px; }
p { margin: 0 0 12px; color: var(--muted); }
a { color: var(--accent); }

.cards {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin: 24px 0;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  text-decoration: none;
  color: var(--fg);
}
.card p { margin: 0; }

/* deck viewer */
.deck {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  min-height: 280px;
  margin: 16px 0;
}
.deck h2 { font-size: 1.5rem; }
.deck .body { font-size: 1.1rem; color: var(--fg); white-space: pre-line; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 12px 0; }
button {
  font: inherit;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}
button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
.status { font-size: 0.9rem; color: var(--muted); }

@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  main { padding: 0 16px; }
}