:root {
  --ink: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --paper: #fff7ed;
  --card: #fffefb;
  --accent: #9a3412;
  --ok: #166534;
  --bad: #991b1b;
  --okbg: #ecfdf5;
  --badbg: #fef2f2;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; background: var(--paper); color: var(--ink); }
body {
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
  padding: calc(12px + var(--safe-t)) 14px calc(96px + var(--safe-b));
  max-width: 720px;
  margin: 0 auto;
}
h1 { font-size: 22px; margin: 0 0 6px; }
h2 { font-size: 18px; margin: 0 0 8px; }
.note, .help, .meta { color: var(--muted); font-size: 13px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
button, select, label.chk {
  font: 16px/1.2 -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  min-height: 44px;
  padding: 10px 12px;
}
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.ghost { background: #fff; }
button.wide, #action { width: 100%; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  margin: 12px 0;
}
.stem { font-size: 17px; margin: 0 0 10px; }
.opt {
  display: block;
  width: 100%;
  text-align: left;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  margin: 8px 0;
  min-height: 44px;
}
.opt.picked { border-color: var(--accent); background: #fff1e6; }
.opt.right { border-color: #16a34a; background: var(--okbg); color: var(--ok); }
.opt.wrong { border-color: #dc2626; background: var(--badbg); color: var(--bad); }
.stat { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid var(--line); }
.stat:last-child { border-bottom: 0; }
#dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255,247,237,.96);
  border-top: 1px solid var(--line);
  padding: 10px 14px calc(10px + var(--safe-b));
}
#dock button { min-height: 48px; }
.chip {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  color: var(--muted);
  background: #fff;
}
.exp { background: #f5f5f4; border-radius: 12px; padding: 10px 12px; }
.score { font-size: 18px; font-weight: 600; }
.material { background: #fff; border-left: 3px solid var(--accent); padding: 8px 12px; margin: 8px 0 12px; }
.err { background: #fef2f2; color: #991b1b; padding: 10px 12px; border-radius: 12px; }
label.chk { display: inline-flex; align-items: center; gap: 6px; }