/* ============================================================
   drift-wall.css — 行迹 · 记忆画廊（DriftWall 移植版）
   原型：React DriftWall（倾斜 3D 照片墙 + 无限漂移 + 悬停点亮）
   移植：vanilla JS + CSS，逻辑见 js/drift-wall.js
   结构：.drift-wall（透视容器/遮罩）> .drift-wall__plane（倾斜平面）
         > .drift-wall__col ×N > .drift-wall__track（无限位移）> 瓦片
   ============================================================ */

.drift-wall {
  position: absolute;
  inset: 0;
  overflow: hidden;
  perspective: var(--dw-perspective, 1200px);
  perspective-origin: 50% 50%;
  --dw-tile-w: 240px;
  --dw-tile-h: 158px;
  --dw-gap: 18px;
  --dw-radius: 16px;
  --dw-lift: 64px;
  --dw-dim: 0.55;
  --dw-gray: 0;
  --dw-overlay: #180a14;
  --dw-edge: 45%;
  -webkit-mask-image:
    radial-gradient(ellipse 78% 82% at 50% 46%, #000 var(--dw-edge), transparent 100%),
    linear-gradient(to top, #000 var(--dw-edge), transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image:
    radial-gradient(ellipse 78% 82% at 50% 46%, #000 var(--dw-edge), transparent 100%),
    linear-gradient(to top, #000 var(--dw-edge), transparent 100%);
  mask-composite: intersect;
}

.drift-wall__plane {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  flex-direction: row;
  transform-style: preserve-3d;
  transform-origin: 50% 50%;
  will-change: transform;
}

.drift-wall__col {
  position: relative;
  width: calc(var(--dw-tile-w) + var(--dw-gap));
  transform-style: preserve-3d;
}

.drift-wall__track {
  display: flex;
  flex-direction: column;
  transform-style: preserve-3d;
  will-change: transform;
}

.drift-wall__tile {
  position: relative;
  display: block;
  width: 100%;
  height: calc(var(--dw-tile-h) + var(--dw-gap));
  flex: 0 0 auto;
  outline: none;
  transform-style: preserve-3d;
}

.drift-wall__inner {
  position: absolute;
  inset: calc(var(--dw-gap) / 2);
  display: block;
  border-radius: var(--dw-radius);
  overflow: hidden;
  background: #0b0710;
  opacity: var(--dw-dim);
  transform: translateZ(0);
  pointer-events: none;
  transition:
    transform 0.42s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.42s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}

.drift-wall__tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(var(--dw-gray)) saturate(0.92);
  transition: filter 0.42s cubic-bezier(0.22, 1, 0.36, 1);
  user-select: none;
  -webkit-user-drag: none;
}

.drift-wall__overlay {
  position: absolute;
  inset: 0;
  background: var(--dw-overlay);
  opacity: 0.42;
  pointer-events: none;
  transition: opacity 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 悬停 / 键盘聚焦点亮（原型为 is-active 类，这里用 CSS 原生状态，省一层 JS） */
.drift-wall__tile:hover .drift-wall__inner,
.drift-wall__tile.is-active .drift-wall__inner,
.drift-wall__tile:focus-visible .drift-wall__inner {
  opacity: 1;
  transform: translateZ(var(--dw-lift));
  box-shadow: 0 24px 60px -18px rgba(0, 0, 0, 0.7);
}

.drift-wall__tile:hover img,
.drift-wall__tile.is-active img,
.drift-wall__tile:focus-visible img {
  filter: grayscale(0) saturate(1.05);
}

.drift-wall__tile:hover .drift-wall__overlay,
.drift-wall__tile.is-active .drift-wall__overlay,
.drift-wall__tile:focus-visible .drift-wall__overlay {
  opacity: 0;
}

.drift-wall--static .drift-wall__plane,
.drift-wall--static .drift-wall__track {
  will-change: auto;
}

@media (prefers-reduced-motion: reduce) {
  .drift-wall__plane,
  .drift-wall__track {
    will-change: auto;
  }
}

/* ============================================================
   driftband — 行迹页里的展示段（深色影院段 + 标题 + 提示）
   ============================================================ */

.driftband {
  position: relative;
  z-index: 3;
  background:
    radial-gradient(120% 90% at 50% 0%, #2c1220 0%, #1a0a14 52%, #12060e 100%);
  padding-top: clamp(48px, 7vh, 88px);
}

.driftband__head {
  max-width: 760px;
}

.driftband .section__label {
  color: #ff9fbe;
}

.driftband .section__title {
  color: #fdf0f5;
  text-shadow: 0 2px 26px rgba(255, 159, 190, 0.24);
}

.driftband__desc {
  margin: 0.9rem 0 0;
  max-width: 58ch;
  color: rgba(253, 240, 245, 0.7);
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  line-height: 1.8;
}

.driftband__stage {
  position: relative;
  height: clamp(540px, 90vh, 900px);
  margin-top: clamp(26px, 4vh, 48px);
}

.driftband__caption {
  position: absolute;
  left: clamp(20px, 4vw, 54px);
  bottom: clamp(24px, 5vh, 52px);
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  pointer-events: none;
  color: rgba(253, 240, 245, 0.78);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.6);
}

.driftband__caption .driftband__hint-line {
  width: 44px;
  height: 1px;
  background: linear-gradient(90deg, #ff9fbe, transparent);
}

@media (max-width: 640px) {
  .driftband__stage {
    height: clamp(420px, 72vh, 620px);
  }

  .driftband__caption {
    left: 18px;
    bottom: 20px;
  }
}