:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-synthesis:none;text-rendering:optimizelegibility;--page:#f5f5f7;--surface:#ffffffd1;--surface-solid:#fff;--ink:#1d1d1f;--muted:#6e6e73;--soft:#86868b;--line:#0000001a;--line-strong:#0000002e;--accent:#0071e3;--shadow:0 22px 60px #0000001f;--radius:8px;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Helvetica Neue,Arial,sans-serif;line-height:1.45}*{box-sizing:border-box}html,body{min-width:320px;min-height:100%;color:var(--ink);background:linear-gradient(#fff 0%,#f5f5f7 42%,#eceef2 100%);margin:0}button{font:inherit;cursor:pointer}button:focus-visible{outline:3px solid color-mix(in srgb, var(--accent), transparent 58%);outline-offset:2px}#app{width:min(1680px,100%);min-height:100svh;margin:0 auto;padding:20px}.app-header{z-index:20;background:color-mix(in srgb, var(--page), transparent 16%);-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);grid-template-columns:minmax(260px,1fr) auto minmax(230px,1fr);align-items:center;gap:16px;padding:10px 0 18px;display:grid;position:relative}.brand{min-width:0;color:inherit;text-align:left;background:0 0;border:0;grid-template-columns:42px minmax(0,1fr);justify-self:start;align-items:center;gap:12px;padding:0;display:inline-grid}.brand-mark{color:#fff;background:#111;border-radius:8px;place-items:center;width:42px;height:42px;font-weight:760;display:grid}.brand strong{overflow-wrap:anywhere;letter-spacing:0;font-size:clamp(24px,2.2vw,34px);line-height:1.06;display:block}.brand small{color:var(--muted);margin-top:3px;font-size:14px;display:block}.view-switcher{border:1px solid var(--line);white-space:nowrap;background:#ffffffb8;border-radius:8px;justify-content:center;align-items:center;gap:4px;min-width:0;padding:4px;display:inline-flex;box-shadow:0 12px 30px #0000000f}.view-switcher button,.control-dock button{min-height:36px;color:var(--muted);background:0 0;border:0;border-radius:6px;font-weight:700}.view-switcher button{padding:0 15px}.view-switcher button.active,.control-dock button.active{background:var(--ink);color:#fff}.model-status{border:1px solid var(--line);min-height:42px;color:var(--muted);background:#ffffffb8;border-radius:8px;justify-self:end;align-items:center;padding:0 14px;font-size:13px;font-weight:700;display:inline-flex}.studio{border:1px solid var(--line);min-height:min(820px,100svh - 124px);box-shadow:var(--shadow);background:linear-gradient(#fffffff5,#eef0f4fa),linear-gradient(90deg,#0071e30f,#ff95000a);border-radius:8px;position:relative;overflow:hidden}.viewer-frame{position:absolute;inset:0}#car-canvas{touch-action:none;width:100%;height:100%;min-height:640px;display:block}#car-canvas.can-click{cursor:pointer}.hotspot-layer{pointer-events:none;position:absolute;inset:0}.hotspot{pointer-events:auto;z-index:6;background:0 0;border:0;border-radius:50%;place-items:center;width:28px;height:28px;transition:opacity .16s,transform .16s;display:grid;position:absolute;transform:translate(-50%,-50%)}.hotspot:before{content:"";border:3px solid var(--part-color);width:12px;height:12px;box-shadow:0 0 0 4px color-mix(in srgb, var(--part-color), transparent 76%), 0 10px 22px #00000029;background:#fff;border-radius:50%}.hotspot.active{transform:translate(-50%,-50%)scale(1.06)}.hotspot.active:before{background:var(--part-color);box-shadow:0 0 0 4px var(--part-color), 0 0 0 10px color-mix(in srgb, var(--part-color), transparent 80%), 0 16px 30px #00000038;border-color:#fff}.hotspot.hidden{opacity:0;pointer-events:none}.studio-title,.part-card,.control-dock,.loading-panel{z-index:12;border:1px solid var(--line);-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);background:#ffffffc2;border-radius:8px;position:absolute;box-shadow:0 18px 50px #0000001f}.studio-title{width:min(300px,100% - 44px);padding:16px;top:22px;left:22px}.studio-title span,.part-card>span,.rail-copy span,.classroom-notes span{color:var(--muted);letter-spacing:.12em;text-transform:uppercase;font-size:12px;font-weight:820;display:block}.studio-title h1{letter-spacing:0;margin:8px 0;font-size:clamp(30px,3vw,40px);line-height:1}.studio-title p,.part-card p,.classroom-notes p{color:var(--muted);margin:0;font-size:17px}.part-card{width:min(380px,100% - 44px);max-height:calc(100% - 132px);padding:18px;bottom:88px;right:22px;overflow:auto}.part-card h2{letter-spacing:0;margin:6px 0 8px;font-size:clamp(30px,3vw,44px);line-height:1}.part-detail-grid{grid-template-columns:1fr 1fr;gap:10px;margin-top:16px;display:grid}.part-detail-grid div{border:1px solid var(--line);background:#ffffffad;border-radius:8px;min-width:0;padding:12px}.part-detail-grid small{color:var(--soft);letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px;font-size:11px;font-weight:800;display:block}.part-detail-grid strong{overflow-wrap:anywhere;font-size:14px;line-height:1.25;display:block}.checkpoint-panel{border-top:1px solid var(--line);margin-top:16px;padding-top:14px}.checkpoint-panel span{color:var(--soft);letter-spacing:.1em;text-transform:uppercase;font-size:11px;font-weight:820;display:block}.checkpoint-panel strong{margin-top:5px;font-size:16px;line-height:1.2;display:block}.checkpoint-panel p{margin:7px 0 12px;font-size:14px;line-height:1.42}.checkpoint-actions{flex-wrap:wrap;gap:8px;display:flex}.checkpoint-actions button{border:1px solid var(--line);min-height:34px;color:var(--ink);background:#ffffffd1;border-radius:6px;padding:0 13px;font-weight:760}.checkpoint-actions button:first-child{background:var(--ink);color:#fff}.checkpoint-actions button.complete{border-color:color-mix(in srgb, var(--accent), white 56%);background:color-mix(in srgb, var(--accent), white 88%);color:var(--accent)}.lesson-progress{margin-top:12px}.lesson-progress span{letter-spacing:0;text-transform:none}.lesson-progress div{background:#0000001a;border-radius:999px;height:5px;margin-top:8px;overflow:hidden}.lesson-progress i{border-radius:inherit;background:var(--accent);width:0%;height:100%;transition:width .18s;display:block}.control-dock{gap:4px;padding:4px;display:inline-flex;bottom:20px;right:22px}.control-dock button{padding:0 13px}.loading-panel{width:min(320px,100% - 44px);color:var(--muted);padding:16px;font-weight:800;top:50%;left:50%;transform:translate(-50%,-50%)}.loading-panel div{background:#0000001a;border-radius:999px;height:6px;margin-top:12px;overflow:hidden}.loading-panel i{border-radius:inherit;background:var(--accent);width:0%;height:100%;transition:width .16s;display:block}.loading-panel.hidden{opacity:0;pointer-events:none}.part-rail{grid-template-columns:minmax(220px,320px) minmax(0,1fr);align-items:center;gap:16px;margin-top:16px;display:grid}.rail-copy{border:1px solid var(--line);background:var(--surface);border-radius:8px;min-height:88px;padding:18px;box-shadow:0 14px 36px #0000000f}.rail-copy strong{margin-top:6px;font-size:17px;line-height:1.2;display:block}.part-dock{scroll-snap-type:x proximity;gap:10px;padding:4px 2px 12px;display:flex;overflow-x:auto}.part-dock button{border:1px solid var(--line);min-width:184px;min-height:72px;color:var(--ink);text-align:left;scroll-snap-align:start;background:#ffffffc2;border-radius:8px;grid-template-rows:auto auto;grid-template-columns:16px minmax(120px,1fr);align-items:center;gap:2px 10px;padding:12px 14px;display:grid;position:relative}.part-dock button span{background:var(--part-color);width:14px;height:14px;box-shadow:0 0 0 5px color-mix(in srgb, var(--part-color), transparent 82%);border-radius:50%;grid-row:1/span 2}.part-dock button strong,.classroom-notes strong{font-size:17px;line-height:1.15;display:block}.part-dock button small{color:var(--muted);font-size:13px;font-weight:700}.part-dock button:hover,.part-dock button.active{border-color:color-mix(in srgb, var(--part-color), white 42%);background:color-mix(in srgb, var(--part-color), white 88%)}.classroom-notes{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:16px;display:grid}.classroom-notes article{border:1px solid var(--line);background:#ffffffd1;border-radius:8px;min-height:150px;padding:18px;box-shadow:0 16px 42px #0000000f}.classroom-notes strong{margin:10px 0 8px;font-size:21px}@media (width<=1060px){.app-header{grid-template-columns:1fr}.brand,.model-status,.view-switcher{justify-self:stretch}.view-switcher{justify-content:flex-start;overflow-x:auto}.model-status{justify-content:space-between}.studio{min-height:760px}#car-canvas{height:760px;min-height:760px}.part-rail,.classroom-notes{grid-template-columns:1fr}}@media (width<=720px){#app{padding:12px}.app-header{gap:10px;padding-bottom:12px}.brand{grid-template-columns:38px minmax(0,1fr)}.brand-mark{width:38px;height:38px}.brand strong{font-size:24px}.brand small{font-size:13px}.view-switcher button{min-width:74px;padding:0 10px;font-size:13px}.studio{min-height:0;box-shadow:none;background:0 0;border:0;gap:10px;display:grid;overflow:visible}.viewer-frame{order:2;height:min(500px,58svh);min-height:430px;position:relative}#car-canvas{border:1px solid var(--line);height:100%;min-height:0;box-shadow:var(--shadow);background:linear-gradient(#fffffff5,#eef0f4fa);border-radius:8px}.hotspot-layer{pointer-events:none;height:auto;min-height:0;inset:0}.studio-title,.part-card,.control-dock,.loading-panel{width:auto;position:static;transform:none}.studio-title{order:1;padding:16px}.studio-title h1{font-size:32px}.studio-title p,.part-card p,.classroom-notes p{font-size:15px}.part-card{order:4;max-height:none;padding:16px;overflow:visible}.part-card h2{font-size:34px}.checkpoint-panel p{font-size:14px}.part-detail-grid{grid-template-columns:1fr}.control-dock{order:3;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;padding:4px;display:grid}.control-dock button{min-height:38px;padding:0 6px;font-size:12px}.loading-panel{order:5}.part-rail{margin-top:12px}.part-dock button{min-width:176px}}@media (width<=390px){.view-switcher button{min-width:66px;font-size:12px}.studio-title h1{font-size:30px}.part-card h2{font-size:34px}}