/* ---------- 客户案例 Case Studies ---------- */

.page-body { padding-top: 56px; }   /* 避开固定导航 */

.collection-header { text-align: center; padding: 60px 24px 8px; }
.collection-header h1 { font-size: clamp(28px, 4.5vw, 44px); font-weight: 700; }
.collection-sub { margin-top: 12px; color: var(--muted); font-size: 16px; line-height: 1.6; }

/* 分类筛选：沿用花色库的 chip 样式，这里只做居中单行 */
.filter-bar { max-width: 1200px; margin: 30px auto 0; padding: 0 24px; }
.filter-group { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chip {
  border: 1px solid var(--line); background: #fff; color: var(--muted);
  padding: 7px 16px; border-radius: 999px; font-size: 13px; cursor: pointer;
  transition: background .2s, color .2s, border-color .2s; user-select: none;
  font-family: inherit;
}
.chip:hover { border-color: var(--text); color: var(--text); }
.chip:focus { outline: none; }
.chip:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
.chip.active { background: var(--text); border-color: var(--text); color: #fff; }

.case-count {
  max-width: 1200px; margin: 16px auto 0; padding: 0 24px;
  font-size: 12px; color: var(--muted); letter-spacing: .02em;
  text-align: center;   /* 筛选条居中，计数也跟着居中，不然会孤零零挂在左边 */
}

/* 网格：统一 4:3 裁切，规整、和花色库同一套栅格语言 */
.cases-grid {
  max-width: 1200px; margin: 16px auto 0; padding: 0 24px;
  display: grid; grid-template-columns: repeat(3, 1fr);
  column-gap: 22px; row-gap: 22px;
}
.case-card {
  position: relative; display: block; width: 100%;
  aspect-ratio: 4 / 3; border-radius: 16px; overflow: hidden;
  background: #f5f5f7; cursor: zoom-in; border: 1px solid rgba(17, 24, 39, .06);
  padding: 0; font: inherit; text-align: left;
  transition: transform .35s cubic-bezier(.2,.7,.3,1.2), box-shadow .35s ease;
}
.case-card:hover { transform: translateY(-8px); box-shadow: 0 26px 50px rgba(0, 0, 0, .16); }
.case-card img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .5s ease;
}
.case-card:hover img { transform: scale(1.055); }

/* 悬停渐显的项目名（只在图片底部压一层极浅暗角，保证白字可读） */
.case-card::after {
  content: ''; position: absolute; inset: auto 0 0 0; height: 46%;
  background: linear-gradient(to top, rgba(0,0,0,.42), rgba(0,0,0,0));
  opacity: 0; transition: opacity .3s ease; pointer-events: none;
}
.case-card:hover::after { opacity: 1; }
.case-name {
  position: absolute; left: 18px; bottom: 16px; z-index: 2;
  color: #fff; font-size: 14px; font-weight: 600; letter-spacing: .01em;
  opacity: 0; transform: translateY(6px);
  transition: opacity .3s ease, transform .3s ease; pointer-events: none;
  text-shadow: 0 1px 6px rgba(0,0,0,.35);
}
.case-card:hover .case-name { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .case-card, .case-card img, .case-card::after, .case-name { transition: none; }
}

/* 底部引导（回到核心卖点：上传毛坯房出效果图） */
.cases-cta {
  max-width: 720px; margin: 96px auto 100px; padding: 0 24px; text-align: center;
}
.cases-cta h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 700; line-height: 1.2; }
.cases-cta p { margin: 16px 0 28px; color: var(--muted); font-size: 16px; line-height: 1.7; }

/* ---------- 大图查看（灯箱） ---------- */
.case-viewer {
  position: fixed; inset: 0; z-index: 300; display: none;
  align-items: center; justify-content: center;
  background: rgba(255, 255, 255, .97);   /* 接近实白：否则底下的 WhatsApp 绿球和页面内容会透上来 */
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  backdrop-filter: saturate(160%) blur(18px);
}
.case-viewer.open { display: flex; }
.cv-stage {
  margin: 0; display: flex; flex-direction: column; align-items: center;
  max-width: 92vw; max-height: 92vh;
}
.cv-img {
  display: block; max-width: 92vw; max-height: 82vh;
  border-radius: 14px; object-fit: contain;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .22);
  background: #f5f5f7;
}
.cv-cap { margin-top: 16px; font-size: 13px; color: var(--muted); letter-spacing: .02em; }
.cv-cap b { color: var(--text); font-weight: 600; }

.cv-close {
  position: absolute; top: 18px; right: 22px;
  width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--line); background: #fff; color: var(--text);
  font-size: 24px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 10px rgba(0,0,0,.08); transition: background .2s;
}
.cv-close:hover { background: #f5f5f7; }
.cv-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--line); background: #fff; color: var(--text);
  font-size: 26px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 10px rgba(0,0,0,.08); transition: background .2s;
}
.cv-arrow:hover { background: #f5f5f7; }
.cv-prev { left: 24px; }
.cv-next { right: 24px; }

@media (max-width: 900px) {
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .cases-grid { grid-template-columns: 1fr; gap: 14px; padding: 0 16px; }
  .filter-bar, .case-count { padding: 0 16px; }
  .cases-cta { margin: 64px auto 72px; }
  .cv-prev { left: 10px; }
  .cv-next { right: 10px; }
  .cv-arrow { width: 38px; height: 38px; font-size: 22px; }
  .cv-close { top: 12px; right: 12px; }
}