:root {
  --bg: #f7f5f0;
  --card: #ffffff;
  --ink: #1d1d1f;
  --muted: #5f5f66;
  --line: #ddd8cc;
  --accent: #8a1c1c;
  --accent-ink: #ffffff;
  --chip: #f1ebe0;
  --picked: #fbeaea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --card: #222226;
    --ink: #f2f2f4;
    --muted: #a6a6ae;
    --line: #3a3a40;
    --accent: #e06a6a;
    --accent-ink: #161618;
    --chip: #2e2e33;
    --picked: #3a2525;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header, main, footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 16px;
}

header { padding-top: 24px; }
h1 { margin: 0; font-size: 1.6rem; }
.back { display: inline-block; margin-bottom: 12px; font-size: 0.9rem; text-decoration: none; }
.sub { margin: 0 0 16px; color: var(--muted); }
footer { color: var(--muted); font-size: 0.85rem; padding-bottom: 32px; }
a { color: var(--accent); }

h2 { font-size: 1.3rem; margin: 8px 0 4px; }
.hint { color: var(--muted); margin: 0 0 16px; }

.options { display: grid; gap: 10px; border: 0; padding: 0; margin: 0 0 20px; min-width: 0; }

.option {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  width: 100%;
  padding: 14px 16px;
  background: var(--card);
  color: var(--ink);
  border: 2px solid var(--line);
  border-radius: 12px;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.option:hover { border-color: var(--accent); }
.option:has(input:checked) { border-color: var(--accent); background: var(--picked); }
.option input { margin-top: 5px; accent-color: var(--accent); }
.option small { display: block; color: var(--muted); }

.nav { display: flex; gap: 10px; justify-content: space-between; margin: 8px 0 28px; }

button.primary, button.secondary {
  padding: 12px 20px;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button.primary { background: var(--accent); color: var(--accent-ink); border: 0; }
button.primary:disabled { opacity: 0.4; cursor: not-allowed; }
button.secondary { background: transparent; color: var(--ink); border: 2px solid var(--line); }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.notice {
  background: var(--card);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 20px;
}

.piece {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 14px;
}

.piece h3 { margin: 0; font-size: 1.15rem; }
.piece .by { color: var(--muted); margin: 0 0 8px; }
.piece p { margin: 8px 0; }
.piece .meta { font-size: 0.9rem; color: var(--muted); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 8px 0; list-style: none; }
.chips li { background: var(--chip); border-radius: 999px; padding: 2px 10px; font-size: 0.85rem; }
.chips li.match { background: var(--accent); color: var(--accent-ink); }

details { margin: 20px 0; }
summary { cursor: pointer; font-weight: 600; }