:root{--ink:#172033;--muted:#667085;--line:#d9dee8;--paper:#fff;--wash:#f4f6f9;--accent:#b42318;--warn:#b54708;--chip:#eef2f6;--chip-on:#1d2939}
*{box-sizing:border-box}body{margin:0;background:var(--wash);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
.top{position:sticky;top:0;z-index:2;padding:20px 24px 16px;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}
h1{margin:0;font-size:24px;line-height:1.3}.meta{margin-top:6px;color:var(--muted);font-size:13px}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.detail,.about{display:inline-flex;align-items:center;padding:9px 13px;border:0;border-radius:6px;background:var(--accent);color:#fff;text-decoration:none;font-size:13px;font-weight:700;cursor:pointer}
.about{background:#344054}

.filters{margin-top:14px;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:#f8fafc}
.filter-row{display:flex;align-items:flex-start;gap:10px;margin:0 0 10px}
.filter-row:last-of-type{margin-bottom:8px}
.filter-lab{flex:0 0 36px;padding-top:7px;color:var(--muted);font-size:12px;font-weight:700}
.filter-group{display:flex;flex-wrap:wrap;gap:8px}
.filter-chip{appearance:none;border:1px solid var(--line);background:var(--chip);color:var(--ink);border-radius:999px;padding:6px 12px;font-size:12px;font-weight:700;cursor:pointer;line-height:1.2}
.filter-chip[aria-pressed="true"]{background:var(--chip-on);border-color:var(--chip-on);color:#fff}
.filter-chip:focus-visible{outline:3px solid #98a2b3;outline-offset:2px}
.filter-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin-top:2px}
.filter-stat{color:var(--muted);font-size:12px}
.filter-reset{border:0;background:transparent;color:#344054;font-size:12px;font-weight:700;cursor:pointer;padding:4px 0}
.filter-reset:hover{text-decoration:underline}

main{max-width:1800px;margin:0 auto;padding:20px 24px 42px}
section{margin:0 0 28px;padding:18px;border:1px solid var(--line);border-radius:7px}
section[data-product="d3"]{background:#eef7ff}
section[data-product="ue4"]{background:#f2fbf4}
section[data-product="urp"]{background:#fff7e8}
section[hidden]{display:none}
h2{margin:0 0 12px;font-size:18px;border-left:4px solid var(--accent);padding-left:10px}
.count{color:var(--muted);font-size:12px;font-weight:500}
.grid{--tile-width:300px;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,var(--tile-width)),1fr));gap:14px}
.card{margin:0;background:var(--paper);border:1px solid var(--line);border-radius:7px;overflow:hidden;box-shadow:0 2px 8px rgba(16,24,40,.06)}
.card[hidden]{display:none}
.card img{display:block;width:100%;height:auto;background:#fff;cursor:zoom-in}
.card .missing{display:grid;place-items:center;min-height:160px;padding:18px;background:#fff7ed;color:var(--warn);font-size:13px;text-align:center}
.caption{padding:10px 12px;font-size:13px;font-weight:700}.channel{display:block;margin-top:3px;color:var(--muted);font-size:11px;font-weight:500}
.empty-filter{margin:0;padding:28px 18px;border:1px dashed var(--line);border-radius:8px;background:#fff;color:var(--muted);text-align:center;font-size:14px}
.fail-banner{margin:0 0 16px;padding:12px 14px;border-radius:7px;background:#fff1f0;border:1px solid #ffccc7;color:#a8071a;font-size:13px}
.about-panel[hidden],.lightbox[hidden]{display:none}
.about-panel,.lightbox{position:fixed;inset:0;z-index:11;display:grid;place-items:center;padding:20px;background:rgba(8,15,28,.55)}
.lightbox{z-index:10;background:rgba(8,15,28,.82)}
.about-content{max-width:560px;background:#fff;border-radius:7px;padding:20px}
.about-close,.lightbox-close{border:0;background:#eef2f6;width:34px;height:34px;border-radius:50%;font-size:20px;cursor:pointer}
.lightbox-content{position:relative;max-width:min(1400px,96vw);display:flex;flex-direction:column;align-items:center;gap:10px}
.lightbox img{max-width:96vw;max-height:82vh;background:#fff}
.lightbox-title{color:#fff;font-size:14px;font-weight:700}
.lightbox-close{position:absolute;top:-16px;right:-16px;background:#fff}
@media(max-width:680px){
  .top{padding:16px}h1{font-size:20px}main{padding:16px}.grid{grid-template-columns:1fr}
  .filter-row{flex-direction:column;gap:6px}.filter-lab{padding-top:0}
}