:root {
  --bg: #fafaf8;
  --fg: #1b1b1a;
  --muted: #6b6a66;
  --line: #e2e0da;
  --panel: #ffffff;
  --btn: #ffffff;
  --btn-hover: #f1efea;
  --accent: #1b1b1a;
  --felt: #1e3a2f;
  --felt-line: #2c4d40;
  --felt-fg: #f3f1ea;
  --felt-muted: #a9bcb2;
  --gold: #f2c14e;
  --good: #1f7a4d;
  --near: #9a6a00;
  --bad: #b3261e;
  --card: #fffefb;
  --card-edge: #d9d5cc;
  --red: #c0272d;
  --black: #1d1d1f;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141413; --fg: #ecebe6; --muted: #9b9a94; --line: #2e2d2a; --panel: #1b1b1a;
    --btn: #22211f; --btn-hover: #2c2b28; --accent: #ecebe6; --felt: #16302a; --felt-line: #24443a;
    --good: #5cc28f; --near: #e0b04a; --bad: #f08a80; color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; color: inherit; }
a { color: inherit; }
.muted { color: var(--muted); }
[hidden] { display: none !important; }

/* ---- bar ---- */
.bar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px 24px; border-bottom: 1px solid var(--line); background: var(--panel);
}
.brand { font-weight: 650; letter-spacing: -0.01em; }
.bar nav { display: flex; gap: 18px; font-size: 14px; }
.bar nav a { text-decoration: none; color: var(--muted); }
.bar nav a:hover { color: var(--fg); }

/* ---- layout ---- */
.layout {
  max-width: 1240px; margin: 0 auto; padding: 20px 24px 48px;
  display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; align-items: start;
}
.game { min-width: 0; display: flex; flex-direction: column; gap: 14px; }

/* ---- level tabs ---- */
.modes { display: flex; flex-wrap: wrap; gap: 2px; border-bottom: 1px solid var(--line); }
.modes button {
  background: none; border: 0; border-bottom: 2px solid transparent; margin-bottom: -1px;
  padding: 8px 12px; cursor: pointer; color: var(--muted); white-space: nowrap;
}
.modes button span { font-size: 12px; opacity: 0.8; margin-left: 2px; }
.modes button:hover { color: var(--fg); }
.modes button[aria-selected="true"] { color: var(--fg); border-bottom-color: var(--fg); font-weight: 600; }

.custom { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.custom label { font-weight: 600; }
.custom input { width: 130px; }
.custom .muted { font-size: 13px; flex-basis: 100%; }

input {
  border: 1px solid var(--line); background: var(--panel); border-radius: 6px; padding: 8px 10px;
  font-variant-numeric: tabular-nums;
}
input:focus { outline: 2px solid var(--fg); outline-offset: -1px; }

.btn {
  border: 1px solid var(--line); background: var(--btn); border-radius: 6px; padding: 7px 14px;
  cursor: pointer; white-space: nowrap;
}
.btn:hover:not(:disabled) { background: var(--btn-hover); }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn.primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.btn.primary:hover:not(:disabled) { background: var(--accent); opacity: 0.88; }
.btn.small { padding: 3px 10px; font-size: 13px; }

/* ---- the table ---- */
.table {
  background: var(--felt); color: var(--felt-fg); border-radius: 12px; padding: 18px 20px 16px;
  display: flex; flex-direction: column; gap: 18px; min-height: 360px;
}
.table-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.target { font-size: 34px; font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.01em; line-height: 1.1; }
.target-label { font-size: 15px; font-weight: 500; color: var(--felt-muted); margin-right: 4px; letter-spacing: 0; }
.table-meta { display: flex; gap: 14px; align-items: baseline; color: var(--felt-muted); font-size: 13px; }
.table-meta .muted { color: var(--felt-muted); }
.timer { font-variant-numeric: tabular-nums; font-size: 18px; color: var(--felt-fg); min-width: 3.2em; text-align: right; }

.piles {
  container-type: inline-size;
  display: flex; flex-wrap: wrap; justify-content: center; align-content: flex-start;
  gap: 12px 10px; min-height: 170px; padding-top: 12px;
}
.pile {
  --cw: clamp(62px, calc((100cqw - (var(--n, 8) - 1) * 10px) / var(--n, 8)), 108px);
  background: none; border: 0; padding: 0; cursor: pointer; border-radius: 9px;
  transition: transform 120ms ease;
}
.pile:disabled { cursor: default; }
.pile:hover:not(:disabled) { transform: translateY(-3px); }
.pile.selected { transform: translateY(-12px); }
.pile.selected .card { box-shadow: 0 0 0 3px var(--gold), 0 10px 18px rgba(0, 0, 0, 0.35); }
.pile:focus-visible { outline: none; }
.pile:focus-visible .card { box-shadow: 0 0 0 3px #7fb3ff; }
.pile.fresh .card { animation: drop 180ms ease-out; }
@keyframes drop { from { transform: scale(0.86); } to { transform: none; } }
.table.over .pile .card { opacity: 0.9; }

.ops { display: flex; justify-content: center; gap: 10px; }
.ops button {
  width: 52px; height: 44px; border-radius: 8px; border: 1px solid var(--felt-line);
  background: rgba(255, 255, 255, 0.06); color: var(--felt-fg); font-size: 24px; line-height: 1; cursor: pointer;
}
.ops button:hover:not(:disabled) { background: rgba(255, 255, 255, 0.14); }
.ops button.on { background: var(--gold); color: #1d1d1f; border-color: var(--gold); }
.ops button:disabled { opacity: 0.35; cursor: default; }

.status { min-height: 22px; text-align: center; font-size: 14px; color: var(--felt-muted); }
.status.warn { color: #ffd59a; }
.status .btn { color: var(--fg); }

/* ---- playing cards ---- */
.card {
  position: relative; width: var(--cw); height: calc(var(--cw) * 1.4);
  background: var(--card); border: 1px solid var(--card-edge); border-radius: calc(var(--cw) * 0.08);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08), 0 4px 10px rgba(0, 0, 0, 0.28);
  font-family: Georgia, "Times New Roman", serif; user-select: none; overflow: hidden;
}
.card.red { color: var(--red); }
.card.black { color: var(--black); }
.corner {
  position: absolute; top: calc(var(--cw) * 0.05); left: calc(var(--cw) * 0.06);
  display: flex; flex-direction: column; align-items: center; line-height: 0.95; width: calc(var(--cw) * 0.17);
}
.corner.flip { top: auto; left: auto; bottom: calc(var(--cw) * 0.05); right: calc(var(--cw) * 0.06); transform: rotate(180deg); }
.corner-rank { font-size: calc(var(--cw) * 0.19); font-weight: 700; letter-spacing: -0.06em; }
.corner-suit { font-size: calc(var(--cw) * 0.15); }
.face { position: absolute; inset: 15% 22%; }
.face.pips .pip {
  position: absolute; transform: translate(-50%, -50%); font-size: calc(var(--cw) * 0.22); line-height: 1;
}
.face.pips .pip.flip { transform: translate(-50%, -50%) rotate(180deg); }
.face.ace { display: grid; place-items: center; }
.pip.big { font-size: calc(var(--cw) * 0.5); }
.face.court { inset: 13% 19%; }
.frame {
  position: absolute; inset: 0; border: 1px solid currentColor; border-radius: 3px;
  display: grid; place-items: center; opacity: 0.95;
  background: repeating-linear-gradient(45deg, transparent 0 6px, rgba(0, 0, 0, 0.025) 6px 7px);
}
.court-letter { font-size: calc(var(--cw) * 0.44); font-weight: 700; font-style: italic; }
.court-suit { position: absolute; top: 4%; left: 8%; font-size: calc(var(--cw) * 0.17); }
.court-suit.flip { top: auto; left: auto; bottom: 4%; right: 8%; transform: rotate(180deg); }

/* a pile made by combining cards */
.card.made {
  font-family: system-ui, -apple-system, sans-serif; color: var(--black);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; padding: 8% 7%;
  background: #f6f3ea; border-style: dashed; border-color: #b9b2a1;
}
.made-count { position: absolute; top: 5%; left: 0; right: 0; text-align: center; font-size: calc(var(--cw) * 0.11); color: #77705f; }
.made-value { font-size: calc(var(--cw) * 0.3); font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.made-value.long { font-size: calc(var(--cw) * 0.22); }
.made-value.longer { font-size: calc(var(--cw) * 0.16); }
.made-expr {
  position: absolute; bottom: 5%; left: 6%; right: 6%; text-align: center; font-size: calc(var(--cw) * 0.1);
  color: #77705f; line-height: 1.2; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

/* ---- below the table ---- */
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.grow { flex: 1; }
.typed { display: flex; gap: 8px; align-items: center; }
.typed label { white-space: nowrap; color: var(--muted); font-size: 14px; }
.typed input { flex: 1; min-width: 0; font-family: var(--mono); font-size: 14px; }

.result { border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; background: var(--panel); display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.result-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; width: 100%; }
.result-title { font-weight: 650; font-size: 17px; }
.result.good .result-title { color: var(--good); }
.result.near .result-title { color: var(--near); }
.result.bad .result-title { color: var(--bad); }
.result-reward { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.kv { display: grid; grid-template-columns: 96px 1fr; gap: 10px; width: 100%; font-size: 14px; }
.kv .k { color: var(--muted); }
.kv .v { font-family: var(--mono); overflow-wrap: anywhere; }

/* ---- side ---- */
.side { display: flex; flex-direction: column; gap: 22px; position: sticky; top: 16px; }
.side h2, .side summary { font-size: 13px; font-weight: 600; margin: 0 0 6px; }
.side summary { cursor: pointer; }
.side p { margin: 0; font-size: 14px; }
.steps { margin: 0; padding-left: 22px; font-family: var(--mono); font-size: 14px; font-variant-numeric: tabular-nums; }
.steps li { padding: 1px 0; }
.steps.compact { font-size: 13px; color: var(--muted); padding-left: 118px; }
.expression { display: block; font-family: var(--mono); font-size: 13px; overflow-wrap: anywhere; color: var(--fg); }
.prompt {
  white-space: pre-wrap; font-family: var(--mono); font-size: 12px; line-height: 1.5; margin: 6px 0 0;
  padding: 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); max-height: 360px; overflow: auto;
}
.stats { border-collapse: collapse; width: 100%; font-size: 14px; }
.stats th { text-align: left; font-weight: 500; color: var(--muted); font-size: 12px; padding: 0 0 4px; }
.stats td { padding: 3px 0; border-top: 1px solid var(--line); }
.stats .num { font-variant-numeric: tabular-nums; }

dialog { border: 1px solid var(--line); border-radius: 10px; padding: 20px 22px; max-width: 520px; background: var(--panel); color: var(--fg); }
dialog::backdrop { background: rgba(0, 0, 0, 0.35); }
dialog h2 { margin: 0 0 8px; font-size: 17px; }
dialog ul { padding-left: 20px; margin: 0 0 10px; }
dialog li { margin: 4px 0; }
dialog p { font-size: 14px; }

/* ---- small screens ---- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 14px 16px 40px; gap: 22px; }
  .side { position: static; }
}
@media (max-width: 560px) {
  .bar { padding: 10px 16px; }
  .bar nav { gap: 12px; font-size: 13px; }
  .modes button { padding: 8px 9px; }
  .table { padding: 14px 12px; min-height: 0; }
  .target { font-size: 28px; }
  .piles { gap: 10px 8px; }
  .pile { --per: min(var(--n, 8), 5); --cw: clamp(54px, calc((100cqw - (var(--per) - 1) * 8px) / var(--per)), 84px); }
  .controls { display: grid; grid-template-columns: 1fr 1fr; }
  .controls .grow { display: none; }
  .typed { flex-wrap: wrap; }
  .typed label { flex-basis: 100%; }
  .steps.compact { padding-left: 22px; }
  .kv { grid-template-columns: 1fr; gap: 0; }
}