/* 桐平の棺 3D表示（納棺の儀ページ用）。クラスは全て coffin- で始める */
.coffin {
  --coffin-ink: #1e1b22;
  --coffin-gold: #a88b5c;
  --coffin-line: rgba(168, 139, 92, 0.45);
  display: block;
  box-sizing: border-box;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  background: #fff;
  color: var(--coffin-ink);
  font-family: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
}
.coffin *, .coffin *::before, .coffin *::after { box-sizing: border-box; }

.coffin-stage {
  position: relative;
  width: 100%;
  height: 320px;
  border-top: 1px solid var(--coffin-line);
  border-bottom: 1px solid var(--coffin-line);
  background: transparent;
  overflow: hidden;
}
@media (min-width: 640px) { .coffin-stage { height: 420px; } }
@media (min-width: 900px) { .coffin-stage { height: 500px; } }

.coffin-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: transparent;
  cursor: grab;
  touch-action: pan-y;
  -webkit-tap-highlight-color: transparent;
  outline: none;
}
.coffin-canvas.is-dragging { cursor: grabbing; }
.coffin-canvas:focus-visible { outline: 2px solid var(--coffin-gold); outline-offset: -4px; }

.coffin-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  font-family: 'Shippori Mincho B1', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: rgba(30, 27, 34, 0.5);
  pointer-events: none;
  transition: opacity 0.6s ease;
}
.coffin-loading.is-hidden { opacity: 0; }

.coffin-fallback {
  margin: 0;
  padding: 72px 20px;
  text-align: center;
  font-family: 'Shippori Mincho B1', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  font-size: 15px;
  line-height: 1.9;
  letter-spacing: 0.08em;
  border-top: 1px solid var(--coffin-line);
  border-bottom: 1px solid var(--coffin-line);
}

.coffin-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 14px;
  padding: 18px 0 6px;
}
.coffin-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.coffin-group-label {
  font-family: 'Shippori Mincho B1', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  font-size: 13px;
  letter-spacing: 0.14em;
  margin-right: 2px;
}

.coffin-btn {
  position: relative;
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
  padding: 10px 18px 11px;
  min-height: 40px;
  border: 1px solid var(--coffin-line);
  border-radius: 0;
  box-shadow: none;
  background: #fff;
  color: var(--coffin-ink);
  font-family: 'Shippori Mincho B1', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  font-size: 14px;
  line-height: 1.4;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background-color 0.4s ease, border-color 0.4s ease;
}
.coffin-btn::after {
  content: '';
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 5px;
  height: 1px;
  background: var(--coffin-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.45s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.coffin-btn:hover::after,
.coffin-btn:focus-visible::after { transform: scaleX(1); }
.coffin-btn:focus-visible { outline: 2px solid var(--coffin-gold); outline-offset: 2px; }
.coffin-btn[aria-pressed='true'] {
  border-color: var(--coffin-gold);
  background: #faf6ee;
}
.coffin-btn[aria-pressed='true']::after { transform: scaleX(1); }

.coffin-hint {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(30, 27, 34, 0.55);
  white-space: nowrap;
}

.coffin-note {
  margin: 10px 0 0;
  font-size: 11.5px;
  line-height: 1.8;
  letter-spacing: 0.06em;
  color: rgba(30, 27, 34, 0.62);
}

@media (max-width: 639px) {
  .coffin-controls { gap: 10px 10px; padding-top: 14px; }
  .coffin-btn { padding: 9px 14px 10px; font-size: 13px; }
  .coffin-hint { margin-left: 0; width: 100%; text-align: right; }
}

@media (prefers-reduced-motion: reduce) {
  .coffin-btn, .coffin-btn::after, .coffin-loading { transition: none; }
}