:root {
  color-scheme: dark;
  --felt: #11634f;
  --felt-dark: #0b3f36;
  --felt-line: rgba(255, 255, 255, .12);
  --panel: rgba(9, 30, 35, .72);
  --card: #fffaf0;
  --ink: #172026;
  --muted: #b7d6d0;
  --red: #c72f3f;
  --black: #172026;
  --gold: #f3c95b;
  --shadow: 0 14px 34px rgba(0, 0, 0, .28);
  --card-w: clamp(58px, 9vw, 98px);
  --card-h: calc(var(--card-w) * 1.42);
  --gap: clamp(8px, 1.5vw, 18px);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  color: white;
  background:
    radial-gradient(circle at top left, rgba(243, 201, 91, .22), transparent 28rem),
    linear-gradient(145deg, var(--felt), var(--felt-dark));
}

button {
  min-height: 40px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 8px;
  padding: 0 14px;
  color: white;
  background: rgba(255, 255, 255, .11);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: rgba(255, 255, 255, .2);
}

button:active {
  transform: translateY(1px);
}

.app {
  width: min(1180px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: clamp(12px, 2vw, 24px);
}

.topbar {
  display: grid;
  grid-template-columns: minmax(130px, 1fr) auto auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 18px;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 54px);
  letter-spacing: 0;
  line-height: 1;
}

.topbar p {
  margin: 6px 0 0;
  color: var(--muted);
  font-weight: 700;
}

.stats,
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.stats span {
  min-width: 82px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--muted);
  background: var(--panel);
  font-size: 14px;
}

.stats strong {
  display: block;
  margin-top: 2px;
  color: white;
  font-size: 18px;
}

.board {
  position: relative;
  min-height: calc(100vh - 130px);
  border: 1px solid rgba(255, 255, 255, .15);
  border-radius: 8px;
  padding: clamp(10px, 2vw, 22px);
  overflow-x: auto;
  background:
    linear-gradient(90deg, var(--felt-line) 1px, transparent 1px),
    linear-gradient(var(--felt-line) 1px, transparent 1px),
    rgba(255, 255, 255, .04);
  background-size: 42px 42px;
  box-shadow: var(--shadow);
}

.upper-row {
  display: flex;
  justify-content: space-between;
  gap: var(--gap);
  min-width: calc(var(--card-w) * 7 + var(--gap) * 6);
  margin-bottom: clamp(18px, 3vw, 34px);
}

.stock-area,
.foundation-area,
.tableau {
  display: grid;
  gap: var(--gap);
}

.stock-area {
  grid-template-columns: repeat(2, var(--card-w));
}

.foundation-area {
  grid-template-columns: repeat(4, var(--card-w));
}

.tableau {
  grid-template-columns: repeat(7, var(--card-w));
  align-items: start;
  min-width: calc(var(--card-w) * 7 + var(--gap) * 6);
}

.pile {
  position: relative;
  width: var(--card-w);
  min-height: var(--card-h);
  border-radius: 8px;
}

.pile::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 2px dashed rgba(255, 255, 255, .22);
  border-radius: 8px;
}

.foundation::after {
  content: attr(data-suit-symbol);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, .28);
  font-size: calc(var(--card-w) * .44);
  font-weight: 800;
}

.card {
  position: absolute;
  left: 0;
  top: 0;
  width: var(--card-w);
  height: var(--card-h);
  border: 1px solid rgba(20, 20, 20, .16);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  box-shadow: 0 6px 14px rgba(0, 0, 0, .22);
  cursor: pointer;
  user-select: none;
  touch-action: none;
  transition: transform .12s ease, box-shadow .12s ease;
}

.card:hover,
.card.selected {
  transform: translateY(-3px);
  box-shadow: 0 12px 18px rgba(0, 0, 0, .28);
}

.card.face-down {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, .18) 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(315deg, rgba(255, 255, 255, .18) 25%, transparent 25%) 0 0 / 18px 18px,
    #214c87;
  border-color: rgba(255, 255, 255, .25);
  color: transparent;
}

.card.dragging {
  pointer-events: none;
  z-index: 1000;
  transform: none;
}

.card.red {
  color: var(--red);
}

.rank {
  position: absolute;
  top: 7px;
  left: 8px;
  display: grid;
  line-height: 1;
  text-align: center;
  font-size: clamp(14px, 2vw, 22px);
  font-weight: 900;
}

.center-suit {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: calc(var(--card-w) * .54);
  font-weight: 900;
}

.corner {
  position: absolute;
  right: 8px;
  bottom: 7px;
  transform: rotate(180deg);
  font-size: clamp(14px, 2vw, 22px);
  font-weight: 900;
}

.column .card {
  top: calc(var(--offset) * clamp(18px, 3.2vw, 34px));
}

.column .card.face-down {
  top: calc(var(--offset) * clamp(10px, 2vw, 22px));
}

.column {
  min-height: calc(var(--card-h) + var(--cards, 0) * clamp(18px, 3.2vw, 34px));
}

.drop-target::before {
  border-color: var(--gold);
  background: rgba(243, 201, 91, .16);
}

.message {
  min-height: 30px;
  margin-top: 12px;
  color: #fff4c2;
  font-weight: 800;
}

.dialog {
  position: fixed;
  inset: 0;
  display: none;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, .56);
}

.dialog.show {
  display: grid;
}

.dialog-panel {
  width: min(390px, 100%);
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 8px;
  padding: 26px;
  text-align: center;
  background: #10372f;
  box-shadow: var(--shadow);
}

.dialog-panel h2 {
  margin: 0 0 10px;
  font-size: 34px;
}

@media (max-width: 760px) {
  .topbar {
    grid-template-columns: 1fr;
  }

  .stats,
  .actions {
    justify-content: flex-start;
  }

  .stats span {
    flex: 1 1 86px;
  }

  .actions button {
    flex: 1 1 110px;
  }

/* スマホ最適化 */
@media (max-width: 768px) {

  :root{
    --card-w: 42px;
    --gap: 4px;
  }

  .app{
    padding: 6px;
  }

  .board{
    overflow-x: auto;
    padding: 8px;
  }

  .upper-row,
  .tableau{
    min-width: auto;
    width: 100%;
  }

  .tableau{
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
  }

  .stock-area{
    grid-template-columns: repeat(2, var(--card-w));
  }

  .foundation-area{
    grid-template-columns: repeat(4, var(--card-w));
  }

  .stats span{
    min-width: 60px;
    font-size: 12px;
  }

  .stats strong{
    font-size: 14px;
  }

  button{
    min-height: 36px;
    font-size: 12px;
    padding: 0 8px;
  }

  h1{
    font-size: 24px;
  }
}
}