*, *::before, *::after { box-sizing: border-box; }

:root {
  --card-face: #ffffff;
  --card-edge: rgba(15, 23, 42, 0.18);
  --card-red: #d63a3a;
  --card-black: #0f172a;
  --felt: radial-gradient(ellipse at 50% 0%, var(--color-primary-20), transparent 70%), var(--color-bg);
}

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font-ui);
  color: var(--color-text);
  background: var(--felt);
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
button:hover { background: var(--color-hover); border-color: var(--color-secondary); }
button:disabled { opacity: 0.45; cursor: default; }
button.primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-on-primary); }
button.primary:hover { background: var(--color-primary-hover); }
button:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* ── Top bar ─────────────────────────────────────────────── */
.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 14px 16px 6px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { margin: 0; font-size: 20px; letter-spacing: 0.02em; }
.brand-mark {
  display: grid; place-items: center;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 20px;
}
.status { display: flex; gap: 18px; font-variant-numeric: tabular-nums; }
.stat-label { color: var(--color-text-muted); font-size: 13px; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; }
.segmented { display: inline-flex; }
.segmented button { border-radius: 0; }
.segmented button:first-child { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.segmented button:last-child { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; border-left: 0; }
.segmented button[aria-pressed="true"] { background: var(--color-primary-20); border-color: var(--color-primary); color: var(--color-text); }

/* ── Table layout ────────────────────────────────────────── */
.table {
  --gap: clamp(5px, 1.6vw, 16px);
  --cw: min(104px, calc((min(100vw, 900px) - 32px - 6 * var(--gap)) / 7));
  --ch: calc(var(--cw) * 1.4);
  --radius-card: calc(var(--cw) * 0.08);
  flex: 1;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 10px 16px 0;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.row {
  display: grid;
  grid-template-columns: repeat(7, var(--cw));
  gap: var(--gap);
  justify-content: center;
}
.top-row { margin-bottom: calc(var(--gap) * 1.6); }

.pile {
  position: relative;
  width: var(--cw);
  height: var(--ch);
  border-radius: var(--radius-card);
}
.stock, .waste, .foundation, .tableau:empty {
  box-shadow: inset 0 0 0 2px var(--color-muted-20);
}
.waste { box-shadow: none; }
.stock { cursor: pointer; }
.stock:empty::after, .foundation:empty::after {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  color: var(--color-muted-20);
  font-weight: 700;
  font-size: calc(var(--cw) * 0.36);
}
.stock:empty::after { content: "↻"; color: var(--color-text-muted); opacity: 0.5; }
.foundation:empty::after { content: "A"; }

/* ── Cards ───────────────────────────────────────────────── */
.card {
  position: absolute;
  left: 0;
  width: var(--cw);
  height: var(--ch);
  border-radius: var(--radius-card);
  background: var(--card-face);
  box-shadow: 0 0 0 1px var(--card-edge), 0 1px 3px rgba(0, 0, 0, 0.25);
  color: var(--card-black);
  font-weight: 700;
  line-height: 1;
  will-change: transform;
}
.card.red { color: var(--card-red); }
.card.up { cursor: grab; }
.card .corner {
  position: absolute;
  font-size: calc(var(--cw) * 0.21);
  letter-spacing: -0.04em;
  white-space: nowrap;
}
.card .corner.tl { top: calc(var(--cw) * 0.06); left: calc(var(--cw) * 0.08); }
.card .corner.br { bottom: calc(var(--cw) * 0.06); right: calc(var(--cw) * 0.08); transform: rotate(180deg); }
.card .pip {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding-top: calc(var(--cw) * 0.14);
  font-size: calc(var(--cw) * 0.5);
}
.card .pip.face { font-size: calc(var(--cw) * 0.42); font-family: Georgia, 'Times New Roman', serif; }

.card.back {
  background:
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.12) 0 2px, transparent 2px 7px),
    repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.12) 0 2px, transparent 2px 7px),
    var(--color-primary);
  box-shadow: inset 0 0 0 calc(var(--cw) * 0.05) var(--card-face), 0 0 0 1px var(--card-edge), 0 1px 3px rgba(0, 0, 0, 0.25);
}

.card.dragging {
  z-index: 1000;
  cursor: grabbing;
  pointer-events: none;
  box-shadow: 0 0 0 1px var(--card-edge), 0 12px 24px rgba(0, 0, 0, 0.35);
}
.card.hint, .pile.hint { animation: hint 0.5s ease-in-out 3 alternate; }
.card.hint { box-shadow: 0 0 0 3px var(--color-accent), 0 0 18px var(--color-accent); z-index: 500; }
.pile.hint { box-shadow: inset 0 0 0 3px var(--color-accent); }
@keyframes hint { to { filter: brightness(1.12); } }

.card.shake { animation: shake 0.3s; }
@keyframes shake {
  25% { translate: -5px 0; }
  75% { translate: 5px 0; }
}

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 8px 16px 14px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}
.footer p { margin: 0; }
.stats strong { color: var(--color-text); font-variant-numeric: tabular-nums; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  z-index: 1500;
  max-width: calc(100vw - 32px);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  font-size: 14px;
}
.toast[hidden] { display: none; }

/* ── Win ─────────────────────────────────────────────────── */
.cascade { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 2000; }
.win {
  position: fixed;
  inset: 0;
  z-index: 2001;
  display: grid;
  place-items: center;
  padding: 16px;
  pointer-events: none;
}
.win[hidden] { display: none; }
.win-card {
  pointer-events: auto;
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 28px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
  animation: pop 0.35s ease-out;
}
.win-card h2 { margin: 0 0 6px; font-size: 26px; }
.win-card p { margin: 0 0 16px; color: var(--color-text-muted); }
@keyframes pop { from { transform: scale(0.85); opacity: 0; } }

@media (max-width: 560px) {
  .topbar { padding-top: 10px; }
  .brand h1 { font-size: 17px; }
  button { padding: 6px 9px; font-size: 13px; }
  .tip { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .card.hint, .pile.hint, .card.shake, .win-card { animation: none; }
}