/* 展覽三色 */
:root {
  --river: #63C5D0;   /* 河色 */
  --yam: #A23400;     /* 薯榔色 */
  --ramie: #F9F1DA;   /* 苧麻色 */
  --coral: #E2492F;   /* 刺桐紅 */
  --gap: clamp(8px, 1.5vmin, 16px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  background: #fff;
  color: var(--yam);
  font-family: "PingFang TC", "Noto Sans TC", "Heiti TC", sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* ── 森人 logo（同 symposium：左上固定） ── */
.corner-logo {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 5;
}
.corner-logo img {
  height: 40px;
  width: auto;
  display: block;
}

/* ── 頁首 ── */
.header {
  text-align: center;
  padding: clamp(10px, 2vmin, 24px) 16px clamp(6px, 1vmin, 12px);
  flex: none;
}
.header-sub {
  font-size: clamp(12px, 1.8vmin, 18px);
  letter-spacing: 0.35em;
  color: var(--river);
  font-weight: 600;
}
.header-title {
  font-size: clamp(22px, 4vmin, 40px);
  letter-spacing: 0.25em;
  text-indent: 0.25em;
  font-weight: 700;
  margin: 2px 0;
}
.header-score {
  font-size: clamp(13px, 2vmin, 20px);
  letter-spacing: 0.1em;
}

/* ── 盤面 ── */
.board {
  flex: 1;
  width: 100%;
  min-height: 0;
  display: grid;
  gap: var(--gap);
  padding: var(--gap) calc(var(--gap) * 2) calc(var(--gap) * 2);
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  max-width: 1400px;
}
/* 直式時改 4 欄仍成立（4×4 通用），只限制寬避免卡片過長 */
@media (orientation: portrait) {
  .board { max-width: min(100vw, 78vh); }
}

/* ── 卡片 ── */
.card {
  position: relative;
  perspective: 900px;
  cursor: pointer;
  min-height: 0;
}
.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.3, 1.2, 0.4, 1);
}
.card.flipped .card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: clamp(8px, 1.2vmin, 14px);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(162, 52, 0, 0.18);
}

/* 背面：薯榔色＋苧麻編織紋 */
.card-back {
  background-color: var(--yam);
  background-image:
    repeating-linear-gradient(45deg,
      rgba(249, 241, 218, 0.14) 0, rgba(249, 241, 218, 0.14) 2px,
      transparent 2px, transparent 14px),
    repeating-linear-gradient(-45deg,
      rgba(249, 241, 218, 0.14) 0, rgba(249, 241, 218, 0.14) 2px,
      transparent 2px, transparent 14px);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card-back::after {
  content: "";
  width: 26%;
  aspect-ratio: 1;
  border: 2px solid rgba(249, 241, 218, 0.55);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(99, 197, 208, 0.5) 0%, transparent 65%);
}

/* 正面：照片 */
.card-front {
  transform: rotateY(180deg);
  background: #fff;
}
.card-front img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
}
.card-front .card-label {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 6px 8px;
  font-size: clamp(10px, 1.6vmin, 16px);
  letter-spacing: 0.06em;
  text-align: center;
  color: var(--ramie);
  background: linear-gradient(transparent, rgba(162, 52, 0, 0.85));
  opacity: 0;
  transition: opacity 0.4s;
}

/* 配對成功 */
.card.matched { cursor: default; }
.card.matched .card-face { box-shadow: 0 0 0 3px var(--river), 0 2px 10px rgba(99, 197, 208, 0.5); }
.card.matched .card-label { opacity: 1; }
.card.matched .card-inner { animation: matched-pop 0.45s 0.15s; }
@keyframes matched-pop {
  0%, 100% { transform: rotateY(180deg) scale(1); }
  50% { transform: rotateY(180deg) scale(1.06); }
}

/* 配對失敗抖動 */
.card.wrong .card-inner { animation: wrong-shake 0.35s; }
@keyframes wrong-shake {
  0%, 100% { transform: rotateY(180deg) translateX(0); }
  25% { transform: rotateY(180deg) translateX(-4px); }
  75% { transform: rotateY(180deg) translateX(4px); }
}

/* ── 完成畫面 ── */
.win {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  animation: win-fade 0.6s;
}
.win[hidden] { display: none; }
@keyframes win-fade { from { opacity: 0; } to { opacity: 1; } }

.win-box {
  text-align: center;
  padding: clamp(28px, 5vmin, 56px) clamp(36px, 7vmin, 80px);
  background: #fff;
  border: 3px solid var(--coral);
  border-radius: 20px;
  box-shadow: 0 8px 40px rgba(162, 52, 0, 0.25);
}
.win-title {
  font-size: clamp(28px, 5vmin, 52px);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--coral);
}
.win-text {
  margin: 14px 0 24px;
  font-size: clamp(15px, 2.4vmin, 24px);
  line-height: 1.8;
  letter-spacing: 0.12em;
}
.win-btn {
  font-family: inherit;
  font-size: clamp(16px, 2.6vmin, 26px);
  letter-spacing: 0.2em;
  text-indent: 0.2em;
  padding: 0.6em 1.8em;
  color: var(--ramie);
  background: var(--yam);
  border: none;
  border-radius: 999px;
  cursor: pointer;
}
.win-btn:active { transform: scale(0.96); }