:root {
  --bg: #fbfaf7; --fg: #1d1d1b; --muted: #6b6a66; --line: #d9d6cf;
  --accent: #b3122e; --accent-fg: #fff; --card: #fff; --ok: #2b7a3d;
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161513; --fg: #ebe8e1; --muted: #a09d95; --line: #3a3835;
          --accent: #e0405c; --card: #1f1e1b; --ok: #6fc783; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--sans); }
body { display: flex; flex-direction: column; min-height: 100dvh; }
header { position: sticky; top: 0; background: var(--bg); border-bottom: 1px solid var(--line);
  padding: 0.6rem 1rem 0.5rem; z-index: 2; }
#progress { display: flex; gap: 4px; margin-bottom: 0.4rem; }
#progress span { flex: 1; height: 4px; background: var(--line); border-radius: 2px; }
#progress span.done { background: var(--accent); }
#progress span.cur { background: var(--fg); }
#crumb { font-size: 0.85rem; color: var(--muted); }
main { flex: 1; padding: 1rem 1rem 6rem; max-width: 42rem; margin: 0 auto; width: 100%; }
nav { position: fixed; bottom: 0; left: 0; right: 0; z-index: 3; display: flex; gap: 0.6rem; padding: 0.7rem 1rem;
  padding-bottom: calc(0.7rem + env(safe-area-inset-bottom)); background: var(--bg);
  border-top: 1px solid var(--line); }
button { font: inherit; font-size: 1rem; padding: 0.8rem 1rem; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--fg); flex: 1; min-height: 48px; }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
button:disabled { opacity: 0.4; }
h1 { font-size: 1.5rem; margin: 0.4rem 0 1rem; }
h2 { font-size: 1.25rem; margin: 0 0 0.8rem; }
h3 { font-size: 1.05rem; margin: 1.4rem 0 0.5rem; }
p.lead, .intro p { line-height: 1.5; }
.text { font-family: var(--serif); font-size: 1.08rem; line-height: 1.6; }
.text p { margin: 0 0 1em; text-align: left; hyphens: auto; }
.text .cite { color: var(--muted); font-size: 0.85em; }
.text .math { font-style: italic; white-space: nowrap; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1rem; margin: 1rem 0; }
.card label { display: block; font-size: 0.9rem; color: var(--muted); margin-bottom: 0.4rem; }
textarea, input[type=text] { width: 100%; font: inherit; font-size: 1rem; padding: 0.7rem; border-radius: 8px;
  border: 1px solid var(--line); background: var(--bg); color: var(--fg); }
textarea { min-height: 4.5rem; resize: vertical; }
.seg { display: flex; gap: 0.5rem; }
.seg button { flex: 1; }
.seg button.on { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.rank { list-style: none; padding: 0; margin: 0; }
.rank li { display: flex; align-items: center; gap: 0.6rem; background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 0.6rem 0.7rem; margin-bottom: 0.5rem; }
.rank .pos { width: 2rem; height: 2rem; border-radius: 50%; background: var(--accent); color: var(--accent-fg);
  display: grid; place-items: center; font-weight: 600; flex: none; }
.rank .who { flex: 1; }
.rank .who small { display: block; color: var(--muted); font-size: 0.8rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 60vw; }
.rank .mv { display: flex; flex-direction: column; gap: 0.3rem; }
.rank .mv button { flex: none; min-height: 34px; padding: 0.2rem 0.7rem; font-size: 1rem; }
.hint { color: var(--muted); font-size: 0.9rem; }
.saved { color: var(--ok); font-size: 0.85rem; min-height: 1.2em; }
.finished { text-align: center; padding: 3rem 0; }
.finished .big { font-size: 3rem; }
.reveal { font-size: 0.9rem; color: var(--muted); }
.tabs { display: flex; gap: 0.5rem; position: sticky; top: 3.2rem; background: var(--bg); padding: 0.4rem 0; z-index: 1; }
.tabs .tab { flex: 1; }
.tabs .tab.on { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.pane { position: absolute; left: -300vw; width: calc(100% - 2rem); max-width: 40rem; }
.pane.show { position: static; width: auto; }
.choose { display: flex; gap: 0.5rem; flex: 1; }
.choose button { flex: 1; }
.card.sticky { margin-bottom: 0; }
nav button[hidden] { display: none; }
#crumb a { color: var(--muted); float: right; }