/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: radial-gradient(circle at 40% 20%, #0a5c2e, #084626);
  color: #f2f2f2;
  /* Prevent double-tap zoom on touch devices without disabling pinch-zoom */
  touch-action: manipulation;
}

/* ── Fluid card dimensions ────────────────────────────────────────────────────
   Cards scale smoothly from ~42 px on the smallest phones up to 88 px on
   desktop.  All dependent measurements derive from --card-w so nothing
   needs a separate breakpoint.
   Formula: fill 7 equal columns with 6 × 2 px gaps inside 16 px side padding
   (total horizontal budget = 100vw − 44 px).                                  */
:root {
  --card-w:      clamp(40px, calc((100vw - 44px) / 7), 88px);
  --card-h:      calc(var(--card-w) * 1.3636);       /* 120 / 88 ratio        */
  --stack-offset: max(13px, calc(var(--card-w) * 0.318)); /* 28 / 88 ratio   */
  --waste-fan:   calc(var(--card-w) * 0.159);        /* 14 / 88 ratio         */
  --card-radius: max(5px, calc(var(--card-w) * 0.09));
  --font-rank:   clamp(10px, calc(var(--card-w) * 0.182), 16px);
  --font-center: clamp(18px, calc(var(--card-w) * 0.477), 42px);
}

/* ── App shell ────────────────────────────────────────────────────────────── */
.app {
  max-width: 800px;
  margin: 0 auto;
  padding: 12px 16px 24px;
  /* Prevent accidental text selection while dragging */
  user-select: none;
  -webkit-user-select: none;
}

/* ── Top bar ──────────────────────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

button {
  background: #1b7f3b;
  color: white;
  border: 1px solid #0e5a28;
  border-radius: 6px;
  /* 44 px minimum touch target (Apple HIG / WCAG 2.5.5) */
  min-height: 44px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 14px;
  white-space: nowrap;
}
button:hover  { filter: brightness(1.1); }
button:active { filter: brightness(0.9); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

.move-counter {
  font-size: 13px;
  opacity: 0.85;
  white-space: nowrap;
}

/* ── Board ────────────────────────────────────────────────────────────────── */
.board {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ── Upper row (Stock · Waste · Foundations) ──────────────────────────────── */
.upper {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
  margin-bottom: 12px;
}

/* Waste occupies 2 columns so the fan of 3 cards has room */
.waste-slot { grid-column: span 2; }

.foundation-slot,
.stock-slot,
.waste-slot { position: relative; }

/* ── Pile container ───────────────────────────────────────────────────────── */
.pile {
  position: relative;
  min-height: var(--card-h);
}

/* ── Empty-slot background ────────────────────────────────────────────────── */
.slot {
  width: var(--card-w);
  height: var(--card-h);
  border-radius: var(--card-radius);
  border: 2px dashed rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.06);
  position: relative;
  z-index: 1;
}

/* ── Tableau columns ──────────────────────────────────────────────────────── */
.row {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

.tableau-col {
  position: relative;
  width: var(--card-w);
  min-height: var(--card-h);
}

/* ── Card ─────────────────────────────────────────────────────────────────── */
.card {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--card-w);
  height: var(--card-h);
  border-radius: var(--card-radius);
  background: white;
  color: #111;
  border: 2px solid #d8d8d8;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  z-index: 2;
}

.card.face-down {
  background: repeating-linear-gradient(
    45deg,
    #0d3e20, #0d3e20 8px,
    #12502a 8px, #12502a 16px
  );
  border-color: #0a2e17;
  cursor: default;
}

/* Selected state: gold glow ring */
.card--selected {
  outline: 3px solid #ffd700;
  outline-offset: 2px;
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.65), 0 2px 6px rgba(0, 0, 0, 0.35);
  z-index: 10;
}

/* ── Card content ─────────────────────────────────────────────────────────── */
.card .corner {
  position: absolute;
  font-weight: 700;
  line-height: 1.1;
  pointer-events: none;
}

.corner.tl { top: 5px;    left:  6px; }
.corner.tr { top: 5px;    right: 6px; }
.corner.bl { bottom: 5px; left:  6px; transform: rotate(180deg); }
.corner.br { bottom: 5px; right: 6px; transform: rotate(180deg); }

.rank { font-size: var(--font-rank); font-weight: 700; }
.suit { font-size: var(--font-rank); }

.center-suit {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: var(--font-center);
  line-height: 1;
  pointer-events: none;
}

.red   { color: #c01818; }
.black { color: #111; }