/* PARKE 沛克 · 应用案例页增量样式
   与 main.css 共用同一套 token（--ink-900 / --accent / 8px 间距体系）
   仅补齐本页组件：面包屑、浅色页头、吸顶筛选条、案例卡栅格、空态
   加载顺序：main.css → cases.css */

/* ---------- 面包屑 ---------- */
.crumbs{padding-top:20px;font-size:13px;color:var(--text-3);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.crumbs a:hover{color:var(--ink-900);text-decoration:underline}
.crumbs [aria-current="page"]{color:var(--text-1)}

/* ---------- 页头（浅色，延续首页亮度节奏） ---------- */
.page-head{padding:24px 0 48px}
@media (min-width:992px){.page-head{padding:32px 0 72px}}
.page-head__inner{display:grid;gap:36px;align-items:center}
@media (min-width:992px){.page-head__inner{grid-template-columns:1.06fr .94fr;gap:56px}}
.page-head h1{font-size:30px;line-height:1.16;letter-spacing:-.02em;color:var(--ink-900);margin:10px 0 0}
@media (min-width:576px){.page-head h1{font-size:38px}}
@media (min-width:992px){.page-head h1{font-size:46px}}
.page-head h1 em{font-style:normal;color:var(--accent)}
.page-head__sub{margin-top:18px;color:var(--text-2);font-size:16px;max-width:34em}
.page-head__cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.trustline{margin-top:26px;display:flex;flex-wrap:wrap;gap:10px 20px;font-size:13px;color:var(--text-2);list-style:none;padding:0}
.trustline li{display:flex;align-items:center;gap:7px}
.trustline li::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent);flex:none}
.page-head__media{display:grid;gap:10px}
.page-head__media .media-box{aspect-ratio:16/10;border-radius:var(--r-md);overflow:hidden;border:1px solid var(--line)}
@media (min-width:992px){.page-head__media .media-box{aspect-ratio:4/3}}
.page-head__media img{width:100%;height:100%;object-fit:cover;display:block}
.media-note{font-size:12px;color:var(--text-3);text-align:center;margin:0}

/* ---------- 吸顶筛选条 ---------- */
.filterbar{position:sticky;top:64px;z-index:40;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(8px);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
@media (min-width:992px){.filterbar{top:76px}}
.filterbar__in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 20px;padding:12px 0}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:0}
.filters button{min-height:38px;padding:0 16px;border-radius:999px;border:1px solid var(--line);background:#fff;
  color:var(--text-2);font-size:14px;display:inline-flex;align-items:center;gap:6px;
  transition:background-color .2s,color .2s,border-color .2s}
.filters button .n{font-size:11px;color:var(--text-3);font-variant-numeric:tabular-nums}
.filters button:hover{border-color:var(--ink-900);color:var(--ink-900)}
.filters button[aria-pressed="true"]{background:var(--ink-900);border-color:var(--ink-900);color:#fff}
.filters button[aria-pressed="true"] .n{color:#9fbbd8}
.filterbar__count{margin:0;font-size:13px;color:var(--text-3)}
.filterbar__count strong{color:var(--ink-900);font-weight:500;font-variant-numeric:tabular-nums}

/* ---------- 案例卡栅格 ---------- */
.case-grid{display:grid;gap:16px}
@media (min-width:576px){.case-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:992px){.case-grid{grid-template-columns:repeat(3,1fr);gap:20px}}
@media (min-width:1200px){.case-grid{grid-template-columns:repeat(4,1fr);gap:20px}}
.case-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;transition:transform .25s ease-out,border-color .25s,box-shadow .25s}
.case-card:hover{transform:translateY(-3px);border-color:var(--line-2);box-shadow:var(--shadow)}
.case-card[hidden]{display:none}
.case-media{position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--ink-50);border-bottom:1px solid var(--line);margin:0}
.case-media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s ease-out}
.case-card:hover .case-media img{transform:scale(1.03)}
.case-media .ph{position:absolute;inset:0;border:0;border-radius:0;aspect-ratio:auto}
.case-badge{position:absolute;top:10px;left:10px;z-index:2;font-size:11px;border-radius:999px;padding:3px 10px;
  background:rgba(1,45,94,.88);color:#fff;backdrop-filter:blur(2px)}
.case-body{display:flex;flex-direction:column;gap:10px;padding:16px;flex:1}
.case-body h2{font-size:16px;line-height:1.45;color:var(--ink-900);margin:0}
.case-body p{font-size:13.5px;line-height:1.65;color:var(--text-2);margin:0;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.case-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:auto;padding-top:10px;
  border-top:1px solid var(--ink-100)}
.case-series{font-size:12px;color:var(--text-3);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.case-foot .link-more{font-size:13px;flex:none}

/* ---------- 说明与空态 ---------- */
.grid-note{margin:28px 0 0;padding-top:18px;border-top:1px solid var(--line);font-size:13px;color:var(--text-3)}
.grid-note a{color:var(--ink-900);text-decoration:underline}
.case-empty{margin:24px 0 0;padding:28px 24px;border:1px dashed var(--line-2);border-radius:var(--r-md);
  background:var(--ink-50);color:var(--text-2);font-size:14px;text-align:center}
.case-empty a{color:var(--ink-900);text-decoration:underline}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  .case-card,.case-media img{transition:none}
  .case-card:hover{transform:none}
  .case-card:hover .case-media img{transform:none}
}

/* ---------- 移动端细调 ---------- */
@media (max-width:575px){
  .filterbar{top:56px}
  .filterbar__in{padding:10px 0}
  .filters{flex-wrap:nowrap;overflow-x:auto;width:100%;padding-bottom:2px;scrollbar-width:none}
  .filters::-webkit-scrollbar{display:none}
  .filters button{flex:0 0 auto}
  .filterbar__count{display:none}
}