/* =================================================================================================
 * GCW - SPP Media v4 (Stable)
 * - PC：缩略图左侧竖排；Tab 在大图正下方
 * - 缩略图：未选中更暗；选中正常亮度 + 1px 边框
 * ================================================================================================= */

.gcw-spp-media{
  --gcw-gap: 12px;
  --gcw-radius: 12px;
  --gcw-border: rgba(0,0,0,.12);
  --gcw-border-active: rgba(0,0,0,.38);
  --gcw-bg: #fff;
  --gcw-nav-size: 38px;
  --gcw-thumb-size: 66px;
  --gcw-thumb-gap: 10px;
  position: relative;
}

/* ====== Layout (Desktop) ====== */
@media (min-width: 850px){
  .gcw-spp-media{
    display: grid;
    grid-template-columns: 92px 1fr;
    grid-template-areas:
      "thumbs main"
      "thumbs tabs";
    column-gap: 14px;
    row-gap: 10px;
    align-items: start;
  }
  .gcw-spp-main{ grid-area: main; }
  .gcw-spp-thumbs{ grid-area: thumbs; }
  .gcw-spp-tabs{ grid-area: tabs; margin: 0; justify-content: flex-start; }
}

/* Tabs */
.gcw-spp-tabs{
  display: flex;
  gap: 10px;
  margin: 0 0 var(--gcw-gap) 0;
}
.gcw-spp-tab{
  appearance: none;
  border: 1px solid var(--gcw-border);
  border-radius: 999px;
  padding: 8px 14px;
  background: var(--gcw-bg);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  font-weight: 600;
}
.gcw-spp-tab.is-active{
  border-color: var(--gcw-border-active);
}
.gcw-spp-tab.is-disabled{
  opacity: .35;
  cursor: not-allowed;
}

/* Main track */
.gcw-spp-main{ position: relative; }
.gcw-spp-track{
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--gcw-radius);
  background: var(--gcw-bg);
  border: 1px solid var(--gcw-border);
}
.gcw-spp-track::-webkit-scrollbar{ display:none; }
.gcw-spp-track{ scrollbar-width: none; }

.gcw-spp-slide{
  flex: 0 0 100%;
  width: 100%;
  scroll-snap-align: start;
  position: relative;
  user-select: none;
}
.gcw-spp-img{ width: 100%; height: auto; display: block; }
.gcw-spp-img--empty{
  width: 100%;
  aspect-ratio: 1/1;
  background: rgba(0,0,0,.04);
}

/* Main nav */
.gcw-spp-nav{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: var(--gcw-nav-size);
  height: var(--gcw-nav-size);
  border-radius: 999px;
  border: 1px solid var(--gcw-border);
  background: rgba(255,255,255,.92);
  cursor: pointer;
  z-index: 5;
}
.gcw-spp-prev{ left: 10px; }
.gcw-spp-next{ right: 10px; }
.gcw-spp-nav::before{
  content:"";
  display:block;
  width: 10px;
  height: 10px;
  margin: auto;
  border-right: 2px solid rgba(0,0,0,.55);
  border-bottom: 2px solid rgba(0,0,0,.55);
  transform: rotate(135deg);
}
.gcw-spp-next::before{ transform: rotate(-45deg); }

/* Video slide */
.gcw-spp-slide--video{
  display:flex;
  align-items:center;
  justify-content:center;
  background: rgba(0,0,0,.04);
  min-height: 320px;
}
.gcw-spp-video-placeholder{
  width:100%;
  height:100%;
  min-height: 320px;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
}
.gcw-spp-video-play{
  width: 72px;
  height: 72px;
  border-radius: 999px;
  background: rgba(0,0,0,.65);
  position: relative;
}
.gcw-spp-video-play::after{
  content:"";
  position:absolute;
  left: 30px;
  top: 22px;
  width:0;
  height:0;
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  border-left: 20px solid #fff;
}

/* ====== Thumbs ====== */
.gcw-spp-thumbs{
  display:flex;
  align-items:center;
  gap: 8px;
  margin-top: var(--gcw-gap);
}

/* Desktop thumbs: vertical */
@media (min-width: 850px){
  .gcw-spp-thumbs{
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-top: 0;
  }
}

.gcw-spp-thumbs-track{
  display:flex;
  gap: var(--gcw-thumb-gap);
  overflow-x:auto;
  scroll-behavior:smooth;
  -webkit-overflow-scrolling:touch;
  padding: 2px 0;
  flex: 1 1 auto;
}
.gcw-spp-thumbs-track::-webkit-scrollbar{ display:none; }
.gcw-spp-thumbs-track{ scrollbar-width:none; }

/* Desktop vertical track */
@media (min-width: 850px){
  .gcw-spp-thumbs-track{
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 2px;
    max-height: 520px;
  }
}

.gcw-spp-thumb{
  flex: 0 0 auto;
  width: var(--gcw-thumb-size);
  height: var(--gcw-thumb-size);
  border-radius: 12px;
  border: 1px solid var(--gcw-border);
  background: var(--gcw-bg);
  padding: 0;
  overflow: hidden;
  cursor: pointer;
  position: relative;

  /* 默认：更暗一点 */
  filter: brightness(.72);
  opacity: .95;
}
.gcw-spp-thumb img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

/* 选中：正常亮度 + 1px 边框（稳定可见） */
.gcw-spp-thumb.is-active{
  filter: brightness(1);
  opacity: 1;
  border-color: var(--gcw-border-active);
  box-shadow: 0 0 0 1px var(--gcw-border-active);
}

.gcw-spp-thumb--empty{
  display:block;
  width:100%;
  height:100%;
  background: rgba(0,0,0,.04);
}

/* Thumb nav */
.gcw-spp-thumb-nav{
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--gcw-border);
  background: rgba(255,255,255,.92);
  cursor: pointer;
  flex: 0 0 auto;
}

/* Horizontal arrows default */
.gcw-spp-thumb-nav::before{
  content:"";
  display:block;
  width: 8px;
  height: 8px;
  margin: auto;
  border-right: 2px solid rgba(0,0,0,.55);
  border-bottom: 2px solid rgba(0,0,0,.55);
  transform: rotate(135deg);
}
.gcw-spp-thumb-next::before{ transform: rotate(-45deg); }

/* Desktop vertical arrows */
@media (min-width: 850px){
  .gcw-spp-thumb-prev::before{
    transform: rotate(-135deg); /* up */
  }
  .gcw-spp-thumb-next::before{
    transform: rotate(45deg); /* down */
  }
}

/* Video thumb play overlay */
.gcw-spp-thumb--video .gcw-spp-thumb-play{
  position:absolute;
  right: 6px;
  bottom: 6px;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: rgba(0,0,0,.68);
}
.gcw-spp-thumb--video .gcw-spp-thumb-play::after{
  content:"";
  position:absolute;
  left: 8px;
  top: 6px;
  width:0;
  height:0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid #fff;
}

/* Zoom lens */
.gcw-spp-lens{
  position:absolute;
  left:0;
  top:0;
  width: 160px;
  height: 160px;
  border-radius: 14px;
  border: 1px solid rgba(0,0,0,.18);
  background-repeat: no-repeat;
  pointer-events: none;
  opacity: 0;
  transition: opacity .12s ease;
  z-index: 10;
  box-shadow: 0 10px 30px rgba(0,0,0,.12);
}
.gcw-spp-slide.is-zooming .gcw-spp-lens{ opacity: 1; }

/* Mobile tweaks */
@media (max-width: 480px){
  .gcw-spp-media{ --gcw-thumb-size: 56px; }
  .gcw-spp-nav{ display:none; }
}