.viewer-main{flex:1;display:flex;flex-direction:column;position:relative;min-height:0}.drop-zone{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;cursor:pointer;border:2px dashed var(--border);border-radius:var(--radius);margin:2rem auto;width:calc(100% - 3rem);max-width:960px;padding:4rem 2rem;transition:border-color .2s,background-color .2s}.drop-zone:hover,.drop-zone.dragging{border-color:var(--accent);background-color:#00d4aa0a}.drop-title{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;letter-spacing:-.03em;margin-bottom:.75rem}.drop-sub{color:var(--muted)}.drop-samples{margin-top:1.75rem;color:var(--muted);font-size:.9rem}.sample-btn{background:none;border:1px solid var(--border);border-radius:var(--radius);color:var(--accent);font-size:.85rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;padding:.4rem .85rem;margin-left:.5rem;cursor:pointer;transition:border-color .2s,background-color .2s}.sample-btn:hover{border-color:var(--accent);background-color:#00d4aa14}#viewport{flex:1;width:100%;display:block;min-height:0}.close-btn{position:absolute;top:1rem;right:1.5rem;width:34px;height:34px;background-color:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--muted);font-size:1.3rem;line-height:1;cursor:pointer;transition:color .2s,border-color .2s;z-index:1}.close-btn:hover{color:var(--text);border-color:var(--accent)}.parts-panel{position:absolute;top:1rem;left:1.5rem;width:220px;max-height:calc(100% - 5rem);display:flex;flex-direction:column;background-color:#111318e6;border:1px solid var(--border);border-radius:var(--radius);z-index:1;overflow:hidden}.parts-header{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1rem;border-bottom:1px solid var(--border);font-size:.8rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;color:var(--muted)}.parts-eye-all{background:none;border:none;color:var(--accent);font-size:.8rem;font-family:inherit;cursor:pointer;padding:0}.parts-eye-all:hover{color:var(--accent-dim)}#parts-list{list-style:none;overflow-y:auto}.part-item{display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.5rem 1rem;border-bottom:1px solid var(--border)}.part-item:last-child{border-bottom:none}.part-name{flex:1;min-width:0;background:none;border:none;color:var(--text);font-size:.8rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;text-align:left;cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0}.part-name:hover{color:var(--accent)}.part-eye{flex-shrink:0;background:none;border:none;color:var(--accent);font-size:.75rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;cursor:pointer;padding:0}.part-eye.off{color:var(--muted)}.part-item.part-hidden .part-name{color:var(--muted);text-decoration:line-through}.section-controls{border-top:1px solid var(--border);padding:.75rem 1rem}.section-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:.6rem}.section-label{display:flex;align-items:center;gap:.4rem;color:var(--muted);font-size:.8rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;cursor:pointer}.section-label input{accent-color:var(--accent)}.section-axes{display:flex;gap:.25rem}.axis-btn{width:24px;height:24px;background:none;border:1px solid var(--border);border-radius:4px;color:var(--muted);font-size:.75rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;cursor:pointer;transition:color .2s,border-color .2s}.axis-btn.active{color:var(--accent);border-color:var(--accent)}.section-slider{width:100%;-webkit-appearance:none;appearance:none;height:4px;border-radius:2px;background:var(--border);outline:none}.section-slider:disabled{opacity:.4}.section-slider::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer}.section-slider::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;border:none}.measure-label{position:absolute;transform:translate(-50%,-140%);background-color:var(--bg);border:1px solid var(--accent);border-radius:4px;color:var(--accent);font-size:.8rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;padding:.2rem .5rem;pointer-events:none;z-index:1;white-space:nowrap}@media(max-width:640px){.parts-panel{width:170px;max-height:50%}}.viewer-status{position:absolute;bottom:1rem;left:1.5rem;color:var(--muted);font-size:.85rem;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;pointer-events:none}