/* ============================================================
   AccordionGallery —— React Bits 原生 vanilla 移植
   - 零依赖（不引入 GSAP），动效全部用 CSS transition 实现
   - 复用组件自带 CSS 变量（--ag-*），可在挂载处覆盖
   - 默认保留：灰度折叠 / 3D 倾斜 / 视差漂移 / 角标展开
   ============================================================ */

.accordion-gallery {
  --ag-accent: #ffffff;
  --ag-overlay: #0b0b12;
  --ag-text: #ffffff;
  --ag-gap: 10px;
  --ag-radius: 16px;
  --ag-grow: 2.2;
  --ag-tilt: 8deg;
  --ag-media-size: 320px;
  --ag-dur: 0.6s;

  display: flex;
  flex-direction: row;
  gap: var(--ag-gap);
  width: 100%;
  max-width: 100%;
  perspective: 1400px;
  perspective-origin: 50% 50%;
}

.ag-panel {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border-radius: var(--ag-radius);
  cursor: pointer;
  display: block;
  text-decoration: none;
  outline: none;
  transform-style: preserve-3d;
  transform-origin: center center;
  background: #0a0713;
  box-shadow: 0 10px 30px -18px rgba(0, 0, 0, 0.8);
  will-change: flex-grow, transform;
  transform: rotateY(var(--ag-tilt, 0deg));
  transition: flex-grow var(--ag-dur) cubic-bezier(0.22, 1, 0.36, 1),
    transform var(--ag-dur) cubic-bezier(0.22, 1, 0.36, 1);
  -webkit-tap-highlight-color: transparent;
}

.ag-panel--active {
  flex-grow: var(--ag-grow);
  transform: rotateY(0deg);
}

.ag-panel:focus-visible {
  box-shadow: 0 0 0 2px var(--ag-accent), 0 10px 30px -18px rgba(0, 0, 0, 0.8);
}

.ag-panel__frame {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: inherit;
}

.ag-panel__media {
  --ag-gray: 1;
  --ag-dim: 0.35;
  --ag-shift: 0px;
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--ag-media-size);
  height: 100%;
  filter: grayscale(var(--ag-gray));
  transform: translate(-50%, -50%) translateX(var(--ag-shift));
  transition: transform var(--ag-dur) cubic-bezier(0.22, 1, 0.36, 1),
    filter var(--ag-dur) cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform, filter;
}

.ag-panel__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

.ag-panel__overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, transparent 45%, color-mix(in srgb, var(--ag-overlay) 78%, transparent) 100%),
    color-mix(in srgb, var(--ag-overlay) calc(var(--ag-dim, 0.35) * 100%), transparent);
  transition: background var(--ag-dur) ease;
}

.ag-panel__label {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transform: translateX(-14px);
  transition: opacity var(--ag-dur) ease, transform var(--ag-dur) ease;
}

.ag-panel--active .ag-panel__label {
  opacity: 1;
  transform: translateX(0);
}

.ag-panel__bar {
  flex: 0 0 auto;
  width: 3px;
  height: 26px;
  border-radius: 3px;
  background: var(--ag-accent);
  box-shadow: 0 0 12px color-mix(in srgb, var(--ag-accent) 60%, transparent);
}

.ag-panel__text {
  color: var(--ag-text);
  font-family: inherit;
  font-weight: 600;
  font-size: clamp(1rem, 1.4vw, 1.4rem);
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.55);
}

.ag-panel__text em {
  font-style: normal;
  font-weight: 400;
  opacity: 0.78;
  font-size: 0.78em;
  margin-left: 8px;
  letter-spacing: 0.04em;
}

/* 移动端：竖向堆叠，关闭 3D 与视差 */
@media (max-width: 720px) {
  .accordion-gallery {
    flex-direction: column;
    perspective: none;
    height: auto !important;
  }
  .ag-panel {
    min-height: 124px;
    transform: none !important;
  }
  .ag-panel__media {
    width: 100% !important;
    height: var(--ag-media-size);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ag-panel,
  .ag-panel__media,
  .ag-panel__label {
    transition: none !important;
    will-change: auto;
  }
}