:root {
  --paper: #F4F2EE;
  --card: #FBFAF7;
  --ink: #1C1A19;
  --muted: #76706B;
  --rule: #D9D4CC;
  --claret: #6E1E2B;
  --claret-soft: #F0E4E6;
  --again: #A63341;
  --hard: #A8781F;
  --good: #3B7A55;
  --easy: #2E6B96;
  --serif: "Cormorant Garamond", "Cormorant", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 var(--sans);
  padding: 0 16px;
  min-height: 100vh;
}
button { font: inherit; color: inherit; cursor: pointer; touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--claret); outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

.wrap { max-width: 720px; margin: 0 auto; padding: 32px 0 120px; }

/* ---------- header ---------- */
.top {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; margin-bottom: 28px;
}
.top h1 {
  font: 600 34px/1.1 var(--serif); margin: 0; letter-spacing: -0.01em;
}
.top h1 small { display: block; font: 15px/1.4 var(--sans); color: var(--muted); margin-top: 4px; }
.top .actions { display: flex; gap: 8px; flex-wrap: wrap; }

.ghost {
  background: transparent; border: 1px solid var(--rule); border-radius: 6px;
  padding: 6px 12px; font-size: 14px; color: var(--ink);
}
.ghost:hover { border-color: var(--ink); }
.primary {
  background: var(--claret); color: #fff; border: 1px solid var(--claret);
  border-radius: 6px; padding: 8px 16px; font-size: 15px;
}
.primary:hover { background: #5A1823; }
.primary[disabled] { opacity: .45; cursor: default; }

/* ---------- deck table ---------- */
.decks { width: 100%; border-collapse: collapse; }
.decks th, .decks td { padding: 9px 8px; border-bottom: 1px solid var(--rule); text-align: right; }
.decks th { font-weight: 500; color: var(--muted); font-size: 13px; }
.decks th:first-child, .decks td:first-child { text-align: left; padding-left: 0; }
.decks td.num { font-variant-numeric: tabular-nums; width: 64px; }
.decks tr.l1 td:first-child { padding-left: 20px; }
.decks tr.root td { font-weight: 600; }
.decks .name {
  background: none; border: 0; padding: 0; text-align: left;
  color: var(--ink); text-decoration: none;
}
.decks .name:hover { color: var(--claret); text-decoration: underline; }
.decks td.cram { width: 56px; }
.decks .cram button { background: none; border: 0; color: var(--muted); font-size: 13px; padding: 0; }
.decks .cram button:hover { color: var(--claret); text-decoration: underline; }
.n-new { color: var(--easy); } .n-learn { color: var(--again); } .n-due { color: var(--good); }
.zero { color: var(--rule); }

.row-help { color: var(--muted); font-size: 14px; margin: 14px 0 0; }

/* ---------- stats ---------- */
.stats { margin-top: 40px; }
.stats h2 { font: 600 24px/1.2 var(--serif); margin: 0 0 12px; }
.statgrid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px;
}
.stat { border-top: 2px solid var(--ink); padding-top: 8px; }
.stat b { display: block; font: 600 28px/1 var(--serif); font-variant-numeric: lining-nums tabular-nums; }
.stat span { color: var(--muted); font-size: 13px; }
.forecast { margin-top: 20px; width: 100%; border-collapse: collapse; font-size: 14px; }
.forecast td { padding: 4px 8px 4px 0; border-bottom: 1px solid var(--rule); }
.forecast td:last-child { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- settings ---------- */
.settings { margin-top: 40px; border-top: 1px solid var(--rule); padding-top: 20px; }
.settings h2 { font: 600 24px/1.2 var(--serif); margin: 0 0 12px; }
.settings label { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.settings input[type=number] {
  width: 80px; padding: 6px 8px; border: 1px solid var(--rule); border-radius: 6px; font: inherit;
}
.settings .row { display: flex; gap: 8px; flex-wrap: wrap; }
.danger { color: var(--again); border-color: var(--again); }

/* ---------- study ---------- */
.study-top {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-bottom: 24px; font-size: 14px; color: var(--muted);
}
.study-top .deckname { color: var(--ink); font-weight: 500; }
.study-top .counts span { margin-left: 10px; font-variant-numeric: tabular-nums; }

.label {
  background: var(--card);
  border: 1px solid var(--claret);
  outline: 1px solid var(--claret);
  outline-offset: 4px;
  padding: 48px 40px;
  min-height: 320px;
  display: flex; flex-direction: column; justify-content: center;
  text-align: center;
  cursor: pointer;
}
.label .q {
  font: 500 34px/1.2 var(--serif); margin: 0; text-wrap: balance;
}
.label hr {
  border: 0; border-top: 1px solid var(--claret); width: 56px; margin: 28px auto; opacity: .6;
}
.label .a {
  font: 500 26px/1.35 var(--serif); margin: 0; color: var(--ink); text-wrap: pretty;
}
.label .hint { color: var(--muted); font-size: 14px; margin-top: 28px; }
.label .path { font-size: 13px; color: var(--muted); margin-bottom: 20px; }

.ratebar {
  position: fixed; left: 0; right: 0; bottom: 0;
  background: var(--paper);
  border-top: 1px solid var(--rule);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px));
}
.ratebar .inner { max-width: 720px; margin: 0 auto; display: grid; gap: 8px; grid-template-columns: repeat(4, 1fr); }
.ratebar .inner.single { grid-template-columns: 1fr; }
.rate {
  border: 0; border-radius: 8px; padding: 12px 8px; color: #fff; font-size: 15px;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
}
.rate small { font-size: 12px; opacity: .85; font-variant-numeric: tabular-nums; }
.rate kbd { font: 11px var(--sans); opacity: .65; }
.rate.again { background: var(--again); } .rate.hard { background: var(--hard); }
.rate.good { background: var(--good); } .rate.easy { background: var(--easy); }
.rate.show { background: var(--ink); }
.rate:hover { filter: brightness(1.08); }

.done { text-align: center; padding: 64px 0; }
.done h2 { font: 600 32px/1.2 var(--serif); margin: 0 0 8px; }
.done p { color: var(--muted); margin: 0 0 24px; }

.undo-note { margin-top: 12px; font-size: 13px; color: var(--muted); text-align: center; }

.hidden-input { display: none; }

/* Touch devices: no keyboard hints, roomier tap targets. */
.touch-only { display: none; }
@media (hover: none) and (pointer: coarse) {
  .kb-only, .rate kbd { display: none; }
  .touch-only { display: inline; }
  .decks th, .decks td { padding-top: 13px; padding-bottom: 13px; }
  .rate { padding: 14px 6px; }
}

@media (max-width: 480px) {
  .wrap { padding-top: 20px; }
  .top h1 { font-size: 30px; }
  .label { padding: 32px 20px; min-height: 260px; }
  .label .q { font-size: 27px; }
  .label .a { font-size: 22px; }
  .label .path { margin-bottom: 14px; }
  .decks th, .decks td { padding-left: 5px; padding-right: 5px; }
  .decks td.num { width: auto; min-width: 38px; }
  .decks td.cram { width: auto; padding-right: 0; }
  .decks th.cram { padding-right: 0; }
  .study-top { margin-bottom: 16px; }
  .ratebar .inner { gap: 6px; }
  .rate { font-size: 14px; }
}