/* Riffle Shuffle — one stylesheet, no framework, no web font. */
:root {
  --bg: #0f1a15; --panel: #16241d; --panel2: #1b2c23; --ink: #e9e5d8; --dim: #9aa79c;
  --line: #2d4437; --acc-a: #e2b33c; --acc-b: #6fb3d8; --acc-c: #e0725c; --acc-d: #7fc98a;
  --card: #f3efe3; --cardink: #1b1a17; --red: #b6352d; --shadow: rgba(0,0,0,.42);
  color-scheme: dark;
}
[data-theme="light"] {
  --bg: #efeade; --panel: #fbf8ef; --panel2: #f2eddf; --ink: #1d2721; --dim: #5d6b61;
  --line: #d3cdba; --acc-a: #9a7410; --acc-b: #1d6b96; --acc-c: #b0402b; --acc-d: #2c7a3c;
  --card: #ffffff; --cardink: #1b1a17; --red: #b6352d; --shadow: rgba(0,0,0,.14);
  color-scheme: light;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--ink);
  font: 15px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 0 0 48px;
}
code, .num, .proof, output { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.top {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; justify-content: space-between;
  padding: 18px 22px 12px; border-bottom: 1px solid var(--line); background: var(--panel);
}
.brand h1 { margin: 0; font-size: 26px; letter-spacing: .01em; }
.brand .tag { margin: 2px 0 0; color: var(--dim); font-size: 13px; }
.topright { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tab {
  background: transparent; color: var(--dim); border: 1px solid var(--line);
  border-radius: 7px; padding: 6px 12px; font: inherit; font-size: 13px; cursor: pointer;
}
.tab:hover { color: var(--ink); }
.tab.on { background: var(--acc-a); color: #17120a; border-color: var(--acc-a); font-weight: 600; }
[data-theme="light"] .tab.on { color: #fff; }

main { max-width: 1020px; margin: 0 auto; padding: 20px 22px 0; }
.panel[hidden] { display: none; }
h2 { font-size: 19px; margin: 30px 0 8px; }
h3 { font-size: 15px; margin: 26px 0 6px; letter-spacing: .02em; text-transform: uppercase; color: var(--dim); }
p { margin: 8px 0; }
.lede { font-size: 16px; }
.hint { color: var(--dim); font-size: 13px; }
.caption { color: var(--dim); font-size: 12.5px; margin: 4px 0 18px; }
a { color: var(--acc-b); }

.controls { display: flex; flex-wrap: wrap; gap: 16px; margin: 14px 0; align-items: center; }
.ctrlgroup { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.lab { color: var(--dim); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
button {
  background: var(--panel2); color: var(--ink); border: 1px solid var(--line);
  border-radius: 7px; padding: 7px 13px; font: inherit; font-size: 13.5px; cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--acc-a); }
button:disabled { opacity: .42; cursor: default; }
button.primary { background: var(--acc-a); color: #17120a; border-color: var(--acc-a); font-weight: 600; }
[data-theme="light"] button.primary { color: #fff; }
button.ghost { background: transparent; color: var(--dim); }
input[type="number"], select {
  background: var(--panel2); color: var(--ink); border: 1px solid var(--line);
  border-radius: 6px; padding: 6px 8px; font: inherit; font-size: 13.5px; width: 110px;
}
select { width: auto; }
input[type="range"] { width: 190px; accent-color: var(--acc-a); }
output { min-width: 2.2em; display: inline-block; color: var(--acc-a); font-weight: 600; }
.check { color: var(--dim); font-size: 13px; display: inline-flex; gap: 6px; align-items: center; }

.statstrip {
  display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
}
.stat { flex: 1 1 130px; min-width: 120px; }
.sv { display: block; font-family: ui-monospace, Menlo, monospace; font-size: 22px; color: var(--acc-a); line-height: 1.15; }
.sl { display: block; font-size: 11.5px; color: var(--dim); letter-spacing: .02em; }

.deckgrid { display: flex; flex-wrap: wrap; gap: 4px; margin: 14px 0 6px; }
.pcard {
  width: 44px; height: 60px; border-radius: 5px; background: var(--card); color: var(--cardink);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-family: ui-monospace, Menlo, monospace; font-size: 13px; line-height: 1.1;
  box-shadow: 0 1px 3px var(--shadow); border-bottom: 4px solid var(--acc-a); position: relative;
}
.pcard.red { color: var(--red); }
.pcard .pip { font-size: 15px; }
.pcard .ix { position: absolute; top: 2px; left: 4px; font-size: 8.5px; color: #9a958a; }

.guesswrap { display: flex; gap: 18px; flex-wrap: wrap; margin: 10px 0 20px; }
.guessgrid { flex: 1 1 520px; display: flex; flex-wrap: wrap; gap: 3px; align-content: flex-start; }
.gcard {
  width: 40px; height: 30px; border-radius: 4px; background: var(--card); color: var(--cardink);
  border: 1px solid transparent; font-family: ui-monospace, Menlo, monospace; font-size: 12px;
  cursor: pointer; padding: 0;
}
.gcard.red { color: var(--red); }
.gcard.gone { opacity: .2; cursor: default; }
.gcard.pick { outline: 2px solid var(--acc-a); outline-offset: 1px; }
.guesslog { flex: 0 1 240px; }
.guesslog ol { margin: 4px 0; padding-left: 26px; max-height: 320px; overflow-y: auto; font-size: 13px; }
.guesslog li.hit { color: var(--acc-d); font-weight: 600; }
.guesslog li.miss { color: var(--dim); }

canvas { width: 100%; height: auto; max-width: 100%; display: block; border: 1px solid var(--line);
  border-radius: 10px; background: var(--panel); margin: 10px 0 2px; }

.tablewrap { margin: 18px 0 8px; overflow-x: auto; }
table.num { border-collapse: collapse; font-size: 12.5px; width: 100%; min-width: 520px; }
table.num th, table.num td { border: 1px solid var(--line); padding: 4px 8px; text-align: right; }
table.num th { color: var(--dim); font-weight: 600; text-align: right; background: var(--panel); }
table.num td:first-child, table.num th:first-child { text-align: left; }
table.num tr.famous td { background: rgba(226,179,60,.13); font-weight: 600; }
table.num td.hit { color: var(--acc-d); }
table.num td.off { color: var(--acc-c); }

.proof {
  background: var(--panel); border: 1px solid var(--line); border-radius: 9px;
  padding: 12px 14px; font-size: 12px; overflow-x: auto; white-space: pre; color: var(--dim);
  max-height: 340px; overflow-y: auto;
}
ul { padding-left: 20px; }
li { margin: 5px 0; }
footer { max-width: 1020px; margin: 34px auto 0; padding: 14px 22px 0; border-top: 1px solid var(--line);
  color: var(--dim); font-size: 12.5px; }
@media (max-width: 620px) {
  .pcard { width: 36px; height: 50px; font-size: 11px; }
  .statstrip .sv { font-size: 18px; }
  main { padding: 16px 14px 0; }
}