:root {
  --bg1: #f7fbff;
  --bg2: #ecf7ff;
  --ink: #1c2954;
  --muted: #63739a;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-strong: rgba(255, 255, 255, 0.88);
  --line: rgba(112, 138, 202, 0.22);
  --glow: rgba(93, 191, 255, 0.28);
  --shadow: 0 18px 44px rgba(80, 105, 168, 0.18);
  --card-w: 92px;
  --card-h: 128px;
  --gap: 14px;
  --tableau-overlap: 30px;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
body {
  background:
    radial-gradient(circle at 15% 20%, rgba(118, 219, 255, 0.32), transparent 25%),
    radial-gradient(circle at 85% 15%, rgba(163, 199, 255, 0.30), transparent 26%),
    linear-gradient(160deg, var(--bg1), var(--bg2));
  color: var(--ink);
}

.solitaire-app {
  max-width: 1220px;
  margin: 0 auto;
  padding: 22px 18px 34px;
}

.topbar, .statusbar, .board-shell, .howto {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.7);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  border-radius: 26px;
}

.topbar {
  padding: 18px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: #5b6eb0;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 3.4vw, 3rem);
  line-height: 1;
}

.top-actions { display: flex; gap: 10px; flex-wrap: wrap; }
button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}
button:hover { transform: translateY(-1px); }
.primary-btn {
  color: white;
  background: linear-gradient(135deg, #5278ff, #37c8ff);
  box-shadow: 0 14px 30px rgba(78, 123, 255, 0.28);
}
.secondary-btn {
  color: var(--ink);
  background: rgba(255,255,255,0.84);
  border: 1px solid rgba(93, 122, 206, 0.18);
}

.statusbar {
  margin-top: 14px;
  padding: 14px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.pill {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.75);
  border: 1px solid rgba(93, 122, 206, 0.12);
  font-weight: 700;
  color: #4760a0;
}
.pill span { color: var(--ink); margin-left: 6px; }

.board-shell { margin-top: 14px; padding: 18px; overflow-x: auto; }
.board {
  position: relative;
  min-width: 980px;
  min-height: 760px;
  border-radius: 28px;
  padding: 16px;
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.45), transparent 26%),
    linear-gradient(160deg, rgba(81, 145, 255, 0.11), rgba(42, 212, 184, 0.09)),
    rgba(255,255,255,0.36);
  border: 1px solid rgba(255,255,255,0.65);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.8);
}

.top-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
}
.stock-area, .foundation-area, .tableau-area {
  display: flex;
  gap: var(--gap);
}
.foundation-area { margin-left: auto; }
.tableau-area {
  position: relative;
  margin-top: 18px;
  min-height: 560px;
}

.tableau-col {
  position: relative;
  width: var(--card-w);
  min-height: 540px;
}

.pile-slot {
  position: relative;
  width: var(--card-w);
  height: var(--card-h);
  border-radius: 24px;
  border: 2px dashed rgba(78, 109, 184, 0.20);
  background: linear-gradient(180deg, rgba(255,255,255,0.28), rgba(255,255,255,0.12));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.35), inset 0 8px 18px rgba(255,255,255,0.20);
}
.pile-slot::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 18px;
  background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.25), transparent 55%);
}
.foundation-slot::before {
  content: "A";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.3rem;
  color: rgba(77, 105, 167, 0.25);
}

.card {
  position: absolute;
  width: var(--card-w);
  height: var(--card-h);
  border-radius: 18px;
  user-select: none;
  cursor: grab;
  transition:
    left 240ms cubic-bezier(.22,1,.36,1),
    top 240ms cubic-bezier(.22,1,.36,1),
    transform 180ms ease,
    box-shadow 180ms ease,
    opacity 160ms ease;
  box-shadow: 0 14px 24px rgba(49, 74, 142, 0.18);
  overflow: hidden;
}
.card.dragging {
  z-index: 9999 !important;
  cursor: grabbing;
  transition: none;
  transform: scale(1.03) rotate(1deg);
  box-shadow: 0 26px 44px rgba(49, 74, 142, 0.28);
}
.card.face-down {
  background:
    linear-gradient(145deg, rgba(58,101,245,0.96), rgba(74,214,255,0.96));
  border: 1px solid rgba(255,255,255,0.55);
}
.card.face-down::before,
.card.face-down::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 14px;
}
.card.face-down::before {
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,0.30), transparent 24%),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.18) 0 7px, rgba(255,255,255,0.08) 7px 14px);
}
.card.face-down::after {
  inset: 16px;
  border: 2px solid rgba(255,255,255,0.36);
}

.card.face-up {
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(245,250,255,0.96));
  border: 1px solid rgba(144, 167, 220, 0.35);
}
.card.red { color: #d24f68; }
.card.black { color: #243356; }
.card.selected {
  transform: translateY(-6px);
  box-shadow: 0 24px 40px rgba(80, 120, 220, 0.24), 0 0 0 4px rgba(95, 196, 255, 0.14);
}
.card.hintable {
  box-shadow: 0 0 0 3px rgba(83, 215, 255, 0.2), 0 20px 34px rgba(76, 120, 208, 0.18);
}

.card-corner {
  position: absolute;
  left: 10px;
  top: 9px;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
  font-weight: 800;
}
.card-corner.bottom {
  left: auto;
  right: 10px;
  top: auto;
  bottom: 9px;
  transform: rotate(180deg);
}
.card-rank { font-size: 1.2rem; }
.card-suit { font-size: 0.96rem; margin-top: 3px; }
.card-center {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 2.4rem;
  opacity: 0.9;
}

.win-banner {
  position: absolute;
  inset: 24px;
  display: none;
  place-items: center;
  border-radius: 28px;
  background: rgba(244, 249, 255, 0.72);
  backdrop-filter: blur(12px);
  z-index: 20000;
}
.win-banner.show { display: grid; }
.win-card {
  padding: 28px 32px;
  border-radius: 28px;
  text-align: center;
  background: rgba(255,255,255,0.9);
  box-shadow: 0 24px 60px rgba(81, 118, 196, 0.24);
}
.win-card h2 { margin: 0 0 10px; font-size: 2.2rem; }
.win-card p { margin: 0 0 16px; color: var(--muted); }

.howto { margin-top: 14px; padding: 15px 18px; color: var(--muted); }
.howto p { margin: 0; }

@media (max-width: 720px) {
  .solitaire-app { padding: 14px 10px 24px; }
  .topbar { flex-direction: column; align-items: stretch; }
  .top-actions { justify-content: stretch; }
  .top-actions button { flex: 1; }
}