/* V3.1：产品页 3D 台面区块（样式改自 交付/全量产品预览_v3/styles.css，换成 V3 的颜色和字体） */
.viewer-section{margin-top:64px;border-top:1px solid var(--line);padding-top:40px;scroll-margin-top:110px}
.viewer-intro{display:flex;justify-content:space-between;align-items:flex-end;gap:60px;margin-bottom:28px}
.viewer-intro h2{font-size:44px;line-height:1.08;letter-spacing:-1.4px;margin:14px 0 0;font-weight:500}
.viewer-intro h2 em{font-style:normal;color:var(--muted)}
.viewer-intro>p{max-width:380px;margin:0;font-size:15px;line-height:1.7;color:var(--muted)}
.viewer-shell{border:1px solid var(--line);background:var(--concrete)}
.viewer-topline{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:15px 22px;background:var(--white);border-bottom:1px solid var(--line);font-size:12px;letter-spacing:1px;color:var(--muted)}
#viewer-product-label{font-weight:600;color:var(--ink)}
.context-controls{display:flex;gap:20px}
.context-controls button{font-size:13px;color:var(--muted);padding:4px 0;border-bottom:1px solid transparent}
.context-controls button[aria-pressed=true]{color:var(--ink);border-bottom-color:var(--red)}
.viewer-live{display:flex;gap:8px;align-items:center;font-size:11px;letter-spacing:1px}
.viewer-live i{width:6px;height:6px;border-radius:50%;background:var(--red);animation:v3d-pulse 2s ease-in-out infinite}
@keyframes v3d-pulse{50%{opacity:.35}}
.viewer3d{position:relative;height:min(640px,68vh);min-height:420px;overflow:hidden;background:#d9d4ca}
.viewer3d canvas{width:100%;height:100%;display:block;touch-action:none;cursor:grab;outline-offset:-4px}
.viewer3d canvas.dragging{cursor:grabbing}
.viewer-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:14px;font-size:13px;color:var(--muted);background:var(--concrete);pointer-events:none}
.viewer3d.ready .viewer-loading,.viewer3d.failed .viewer-loading{display:none}
.loading-orbit{width:22px;height:22px;border:1.5px solid var(--line);border-top-color:var(--red);border-radius:50%;animation:v3d-spin 1s linear infinite}
@keyframes v3d-spin{to{transform:rotate(360deg)}}
.viewer-drag{position:absolute;left:22px;bottom:22px;display:flex;align-items:center;gap:10px;font-size:11px;letter-spacing:1.4px;color:var(--ink);background:rgba(255,255,255,.82);padding:9px 12px;pointer-events:none}
.viewer-drag>span:first-child{font-size:18px;line-height:1}
.viewer-zoom{position:absolute;right:22px;bottom:22px;display:flex;gap:6px}
.viewer-zoom button{width:38px;height:38px;background:rgba(255,255,255,.88);border:1px solid var(--line);color:var(--ink);font-size:19px}
.viewer-zoom button:hover{border-color:var(--ink)}
.viewer-fallback{position:absolute;inset:0;background:var(--concrete);padding:50px 70px;display:grid;place-items:center;text-align:center}
.viewer-fallback[hidden]{display:none}
.viewer-fallback img{max-height:70%;width:auto}
.viewer-fallback p{font-size:13px;color:var(--muted)}
.viewer3d.failed .viewer-drag,.viewer3d.failed .viewer-zoom{display:none}
.material-switch{display:flex;align-items:center;gap:12px;padding:13px 22px;background:var(--white);border-top:1px solid var(--line);flex-wrap:wrap}
.material-switch>span{font-size:11px;letter-spacing:1.2px;color:var(--muted);margin-right:6px}
.material-switch>button{display:flex;align-items:center;gap:8px;font-size:13px;border:1px solid var(--line);padding:5px 12px 5px 5px;color:var(--ink);background:var(--paper)}
.material-switch>button img{width:42px;height:26px;object-fit:cover;display:block}
.material-switch>button:hover{border-color:var(--muted)}
.material-switch>button[aria-pressed=true]{border-color:var(--ink);box-shadow:inset 0 -2px 0 var(--red)}
.material-switch>small{margin-left:auto;font-size:12px;color:var(--muted)}
.viewer-controls{display:flex;justify-content:space-between;gap:24px;padding:14px 22px;background:var(--white);border-top:1px solid var(--line)}
.camera-controls,.render-controls{display:flex;gap:22px;flex-wrap:wrap}
.viewer-controls button{font-size:13px;padding:4px 0;color:var(--muted)}
.render-controls button{display:flex;align-items:center;gap:7px}
.viewer-controls button:hover{color:var(--ink)}
.viewer-controls [aria-pressed=true]{color:var(--red)}
.quality-status{font-size:12px;color:var(--muted);margin:12px 0 0;min-height:18px}
.quality-status:empty{display:none}
.viewer-note{font-size:12px;line-height:1.7;color:var(--muted);margin:10px 0 0;max-width:860px}
@media(max-width:900px){.viewer-intro{display:block}.viewer-intro>p{margin-top:16px;max-width:100%}.viewer-intro h2{font-size:36px}}
@media(max-width:650px){
  .viewer-section{margin-top:44px;padding-top:30px}
  .viewer-intro h2{font-size:30px;letter-spacing:-.8px}
  .viewer-intro>p{font-size:14px}
  .viewer3d{height:360px;min-height:0}
  .viewer-topline{flex-wrap:wrap;padding:12px 14px;gap:10px}
  .context-controls{order:3;width:100%;border-top:1px solid var(--line);padding-top:10px;gap:24px}
  .viewer-live{margin-left:auto}
  .viewer-drag{left:12px;bottom:14px;font-size:10px;padding:7px 9px}
  .viewer-zoom{right:12px;bottom:12px}
  .viewer-zoom button{width:34px;height:34px}
  .material-switch{padding:12px 14px;gap:8px}
  .material-switch>span{width:100%}
  .material-switch>button{font-size:12px;padding-right:9px}
  .material-switch>button img{width:34px;height:22px}
  .material-switch>small{width:100%;margin-left:0}
  .viewer-controls{display:block;padding:12px 14px}
  .render-controls{margin-top:10px;border-top:1px solid var(--line);padding-top:10px}
}
@media(prefers-reduced-motion:reduce){.viewer-live i,.loading-orbit{animation:none}}
@media print{.viewer-section{display:none!important}}