:root {
  --bg: var(--tg-theme-bg-color, #fff);
  --fg: var(--tg-theme-text-color, #111);
  --muted: var(--tg-theme-hint-color, #777);
  --card: var(--tg-theme-secondary-bg-color, #f3f3f7);
  --orange: #EF8122;
  --blue: #2E62EC;
  --red: #EC5B58;
  --green: #2EA85C;
}
* { box-sizing: border-box; }
body { margin: 0; padding: 16px; font: 16px/1.4 -apple-system, system-ui, sans-serif; background: var(--bg); color: var(--fg); }
h1 { font-size: 22px; margin: 0 0 8px; }
.muted { color: var(--muted); }
button { font: inherit; padding: 12px 16px; border: 0; border-radius: 12px; background: var(--blue); color: #fff; width: 100%; }
#toast { position: fixed; left: 16px; right: 16px; bottom: 16px; background: var(--red); color: #fff; padding: 12px; border-radius: 12px; }
.card { background: var(--card); border-radius: 16px; padding: 16px; margin: 12px 0; }
.row { display: flex; gap: 12px; align-items: center; }
.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tile { background: var(--card); border-radius: 16px; padding: 16px; text-align: center; font-weight: 600; cursor: pointer; }
.tile.soon { opacity: .5; cursor: default; }
.badge { display: inline-block; min-width: 22px; padding: 2px 7px; border-radius: 11px; background: var(--orange); color: #fff; font-size: 13px; }
.numbers { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.numbers button { background: var(--card); color: var(--fg); padding: 14px 0; }
.numbers button.weak { border: 2px solid var(--orange); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { width: auto; padding: 8px 12px; background: rgba(127,127,127,.15); color: var(--fg); border: 2px solid var(--orange); }
.chip.done { border-color: transparent; opacity: .6; }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--orange); }
.nav { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.nav button { width: 36px; padding: 8px 0; background: var(--card); color: var(--fg); border: 2px solid transparent; }
.nav button.done { background: rgba(46,98,236,.18); }
.nav button.cur { border-color: var(--orange); }
.heatmap { display: grid; grid-template-rows: repeat(7, 10px); grid-auto-flow: column; gap: 3px; }
.heatmap i { display: block; width: 10px; height: 10px; border-radius: 2px; background: rgba(127,127,127,.18); }
.heatmap i.l1 { background: #f9d9b8; } .heatmap i.l2 { background: #f5b370; } .heatmap i.l3 { background: var(--orange); }
.streak { font-size: 28px; font-weight: 700; }
.bar { height: 8px; border-radius: 4px; background: rgba(127,127,127,.18); overflow: hidden; margin-top: 6px; }
.bar i { display: block; height: 100%; background: var(--orange); }
.task { white-space: pre-wrap; font-size: 17px; }
input.answer { width: 100%; font: inherit; padding: 14px; border-radius: 12px; border: 1px solid var(--muted); background: var(--bg); color: var(--fg); }
.ok { color: var(--green); } .bad { color: var(--red); }
button.secondary { background: var(--card); color: var(--fg); }
button.back { background: none; color: var(--blue); width: auto; padding: 8px 0; }
.stack > * + * { margin-top: 12px; }