:root {
  --bg: #f6f6f3; --fg: #1d1d1b; --muted: #5d5d58; --card: #ffffff; --line: #d6d6cf;
  --accent: #1f5fa8; --accent-fg: #ffffff; --on: #1f5fa8; --on-fg: #ffffff;
  --err: #a02020; --track: #e2e2db;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a; --fg: #ececea; --muted: #a2a29c; --card: #222427; --line: #3a3d41;
    --accent: #5b9bde; --accent-fg: #0d1520; --on: #5b9bde; --on-fg: #0d1520;
    --err: #ff8a8a; --track: #34373b;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 18px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 960px; margin: 0 auto; padding: 8px 16px 48px; }
h1 { font-size: 1.35rem; margin: 12px 0; }
h2 { font-size: 1.1rem; margin: 0 0 8px; }
a { color: var(--accent); }
.small { font-size: .9rem; color: var(--muted); }
.top { display: flex; align-items: center; gap: 16px; padding: 10px 16px;
  border-bottom: 1px solid var(--line); background: var(--card); }
.top .brand { font-weight: 700; text-decoration: none; color: var(--fg); }
.grow { flex: 1; }
.inline { display: inline; margin: 0; }
.linkbtn { background: none; border: 0; color: var(--accent); font: inherit; cursor: pointer; padding: 8px 0; }
.msg { padding: 10px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); }
.msg.error { border-color: var(--err); color: var(--err); font-weight: 600; }

.btn, button.btn { display: inline-block; min-height: 48px; padding: 10px 20px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--card); color: var(--fg); font: inherit;
  text-decoration: none; text-align: center; cursor: pointer; }
.btn.done { cursor: default; color: var(--muted); font-weight: 600; }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0; }

.bars { display: grid; gap: 14px; margin: 16px 0; }
.barhead { display: flex; justify-content: space-between; margin-bottom: 4px; }
.track { height: 16px; border-radius: 8px; background: var(--track); overflow: hidden; }
.fill { height: 100%; background: var(--accent); }
section.card { margin: 16px 0; }

.cards { display: grid; gap: 12px; grid-template-columns: 1fr; margin: 8px 0 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.card p { margin: 4px 0 0; color: var(--muted); font-size: .95rem; }
.tag { font-size: .8rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .04em; }
@media (min-width: 640px) { .cards.grid2 { grid-template-columns: 1fr 1fr; } }

.pair { background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 12px; margin: 12px 0; }
.pair.unsaved { border-color: var(--err); }
.pairname { font-weight: 700; margin-bottom: 8px; }
.choices { display: grid; gap: 8px; grid-template-columns: 1fr; }
@media (min-width: 560px) { .choices { grid-template-columns: repeat(3, 1fr); } }
.choice { min-height: 52px; padding: 10px 8px; border-radius: 10px; border: 2px solid var(--line);
  background: var(--bg); color: var(--fg); font: inherit; cursor: pointer; }
.choice.on { background: var(--on); color: var(--on-fg); border-color: var(--on); font-weight: 700; }
.note { margin-top: 6px; }
.note summary { cursor: pointer; color: var(--accent); font-size: .9rem; padding: 6px 0; }
.note textarea { width: 100%; font: inherit; background: var(--bg); color: var(--fg);
  border: 1px solid var(--line); border-radius: 8px; padding: 8px; }
.nav { display: flex; gap: 12px; justify-content: space-between; margin-top: 24px; }
.nav .btn { flex: 1; }

.stack { display: grid; gap: 14px; max-width: 420px; }
.stack label { display: grid; gap: 4px; }
.stack input { font: inherit; min-height: 48px; padding: 8px 10px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card); color: var(--fg); }
.errorlist { color: var(--err); margin: 0; padding-left: 18px; }
.rules { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 4px 16px 12px; }
/* Quick reminder: one box per rule; the full sheet folded below it (20 Oct 2026) */
.summary h2 { font-size: 1.05em; margin: 4px 0 10px; }
.summary ul { list-style: none; margin: 0 0 14px; padding: 0; display: grid; gap: 8px; }
.summary li { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent);
  border-radius: 10px; padding: 8px 12px; }
.fullsheet > summary { cursor: pointer; font-weight: 600; color: var(--accent); padding: 8px 0; }
.rules blockquote { margin: 8px 0; padding: 4px 12px; border-left: 4px solid var(--line); color: var(--muted); }

/* Rules pane beside the pair screen on wide screens (20 Oct 2026) */
.pane { display: none; }
@media (min-width: 1000px) {
  main.wide { max-width: 1480px; }
  .withpane { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 20px; align-items: start; }
  .pane { display: block; position: sticky; top: 8px; margin-top: 12px; }
  .pane[open] { width: 440px; }
  .pane > summary { cursor: pointer; font-weight: 600; color: var(--accent); padding: 6px 4px; }
  .panebody { max-height: calc(100vh - 70px); overflow-y: auto; font-size: .9rem; }
  .panebody .rules { padding: 4px 12px 8px; margin-bottom: 12px; }
  .panebody .summary li { padding: 6px 10px; }
  .panebody h1 { font-size: 1.1rem; }
}

.pick { font: inherit; min-height: 52px; padding: 8px 10px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card); color: var(--fg); width: 100%; }