/* 基本版面 */
:root {
  --bg: #0b3d2e;
  --felt: #115b45;
  --card: #ffffff;
  --text: #111;
  --muted: #c0cfd1;
  --accent: #ff6b00;
  --win: #21c36f;
  --shadow: rgba(0,0,0,0.25);
  --card-min: 100px;
  --card-max: 160px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: #f2f7f6;
  background: linear-gradient(180deg, var(--bg), var(--felt));
}

.page-header {
  padding: 16px;
  text-align: center;
}
.title { margin: 0; font-size: 22px; font-weight: 700; }

.main { max-width: 980px; margin: 0 auto; padding: 0 16px 24px; }

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0 16px;
}
.status { color: #e7f7f3; font-size: 14px; }
.btn {
  appearance: none;
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  background: #fafafa;
  color: #111;
  box-shadow: 0 2px 8px var(--shadow);
  cursor: pointer;
}
.btn:hover { filter: brightness(0.97); }
.btn:active { transform: translateY(1px); }

.table { display: grid; place-items: center; }
.cards {
  display: flex;
  align-items: stretch;
  justify-content: space-evenly;
  gap: 16px;
  width: 100%;
  padding: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* 卡片與翻轉 */
.card {
  position: relative;
  width: clamp(var(--card-min), 14vw, var(--card-max));
  aspect-ratio: 63 / 88; /* 撲克牌比例約 2.5x3.5 in */
  padding: 0;
  background: transparent;
  border: 0;
  perspective: 1000px;
  cursor: pointer;
}
.card:focus { outline: 2px solid #ffe082; outline-offset: 2px; }
.card[disabled] { cursor: not-allowed; }

.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 360ms cubic-bezier(.2,.7,.2,1);
  will-change: transform;
}
.card.is-flipped .card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 10px;
  box-shadow: 0 8px 18px var(--shadow);
}

.card-back {
  background: repeating-linear-gradient(45deg, #1d4e89 0 8px, #2b6cb0 8px 16px);
  border: 3px solid #e2e8f0;
}

.card-front {
  transform: rotateY(180deg);
  background: var(--card);
  color: var(--text);
  border: 3px solid #e2e8f0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 8px;
}

/* 版面：角標與中間花色 */
.corner { display: grid; justify-items: center; align-content: start; gap: 2px; }
.corner.tl { position: absolute; top: 6px; left: 6px; }
.corner.br { position: absolute; bottom: 6px; right: 6px; transform: rotate(180deg); }
.pip { display: grid; place-items: center; }
.rank { font-weight: 700; font-size: 16px; line-height: 1; }
.suit { font-size: 13px; line-height: 1; }
.suit.large { font-size: 40px; }

/* 紅黑花色顏色處理 */
.card-front[data-suit="H"],
.card-front[data-suit="D"] { color: #d32f2f; }
.card-front[data-suit="S"],
.card-front[data-suit="C"] { color: #111; }

/* 目前最大高亮 */
.card.is-top .card-front { box-shadow: 0 0 0 3px var(--win), 0 12px 24px var(--shadow); }

/* 小螢幕調整 */
@media (max-width: 640px) {
  .cards { gap: 12px; }
  .card { width: clamp(80px, 28vw, 120px); }
  .suit.large { font-size: 32px; }
}