:root{color-scheme:dark;font-family:Segoe UI,Microsoft YaHei,system-ui,sans-serif;--bg-1: #060913;--bg-2: #0b1530;--panel: rgba(9, 15, 29, .72);--panel-border: rgba(140, 174, 230, .18);--text: #eef4ff;--muted: #a6b7d6;--accent: #7dd3fc}*{box-sizing:border-box}html,body{width:100%;height:100%;margin:0}body{overflow:hidden;color:var(--text);background:radial-gradient(circle at top,rgba(73,120,255,.22),transparent 32%),radial-gradient(circle at 80% 20%,rgba(125,211,252,.18),transparent 24%),linear-gradient(180deg,var(--bg-2),var(--bg-1))}#app{width:100%;height:100%}.shell{width:100%;height:100%;display:grid;grid-template-columns:minmax(270px,340px) minmax(0,1fr);gap:20px;padding:20px}.sidebar,.viewer-frame{position:relative;overflow:hidden;border:1px solid var(--panel-border);border-radius:24px;background:var(--panel);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:0 24px 80px #00000059}.hero{padding:28px}.sidebar{display:flex;flex-direction:column;gap:16px;min-width:0}.sidebar p{max-width:none}.section-title,.viewer-kicker{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}.model-list{display:grid;gap:10px;overflow:auto;padding-right:2px}.model-item-card{display:grid;gap:8px;padding:12px;border:1px solid rgba(160,188,255,.12);border-radius:18px;background:#070c1852}.model-thumb{width:100%;aspect-ratio:4 / 3;border-radius:12px;object-fit:cover;border:1px solid rgba(160,188,255,.2);background:#0a1022b3}.model-thumb-placeholder{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:12px;letter-spacing:.04em}.model-item{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid rgba(160,188,255,.16);background:#070c188c;color:var(--text);border-radius:16px;padding:14px 16px;text-align:left;font:inherit;cursor:pointer;transition:transform .18s ease,border-color .18s ease,background .18s 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