:root{--bg: #0d1117;--bg-2: #161b22;--bg-3: #21262d;--canvas-bg: #111827;--border: #30363d;--text: #e5e7eb;--text-muted: #6b7280;--accent: #22d3ee;--accent-dim: rgba(34, 211, 238, .15);--wall: #f97316;--wall-dim: rgba(249, 115, 22, .25);--grid: rgba(48, 54, 61, .5);--success: #3fb950;--error: #f85149;--font: "Inter", system-ui, sans-serif;--mono: "JetBrains Mono", "Fira Code", monospace}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:var(--font);font-size:14px}#app{display:flex;flex-direction:column;height:100vh}.header{display:flex;align-items:center;justify-content:space-between;padding:0 16px;height:48px;background:var(--bg-2);border-bottom:1px solid var(--border);flex-shrink:0;gap:16px}.header-left{display:flex;align-items:center;gap:10px;overflow:hidden}.logo-icon{width:22px;height:22px;color:var(--accent);flex-shrink:0}.app-title{font-weight:600;font-size:14px;color:var(--text);white-space:nowrap}.file-name{font-family:var(--mono);font-size:12px;color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.header-right{display:flex;align-items:center;gap:12px;flex-shrink:0}.thickness-label{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted)}.thickness-input-group{display:flex;align-items:center;background:var(--bg-3);border:1px solid var(--border);border-radius:6px;overflow:hidden}.thickness-input-group input{width:72px;padding:4px 8px;background:transparent;border:none;color:var(--text);font-family:var(--mono);font-size:13px;outline:none;text-align:right}.thickness-input-group input::-webkit-inner-spin-button,.thickness-input-group input::-webkit-outer-spin-button{-webkit-appearance:none}.thickness-input-group .unit{padding:4px 8px 4px 0;color:var(--text-muted);font-size:12px}.main{display:flex;flex:1;overflow:hidden}.canvas-container{flex:1;position:relative;overflow:hidden;background:var(--canvas-bg);cursor:grab}.canvas-container:active{cursor:grabbing}#viewer{display:block;width:100%;height:100%}.canvas-empty{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:var(--text-muted);pointer-events:none}.canvas-empty.hidden{display:none}.canvas-empty svg{width:48px;height:48px;opacity:.4}.canvas-empty p{font-size:15px}.coords{position:absolute;bottom:12px;left:12px;font-family:var(--mono);font-size:11px;color:var(--text-muted);background:#0d1117cc;padding:3px 8px;border-radius:4px;pointer-events:none}.zoom-indicator{position:absolute;bottom:12px;right:12px;font-family:var(--mono);font-size:11px;color:var(--text-muted);background:#0d1117cc;padding:3px 8px;border-radius:4px;pointer-events:none}.sidebar{width:272px;background:var(--bg-2);border-left:1px solid var(--border);overflow-y:auto;flex-shrink:0}.sidebar::-webkit-scrollbar{width:4px}.sidebar::-webkit-scrollbar-track{background:transparent}.sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.sidebar-section{border-bottom:1px solid var(--border)}.section-header{display:flex;align-items:center;gap:6px;padding:10px 14px;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);cursor:pointer;-webkit-user-select:none;user-select:none;transition:color .15s}.section-header:hover{color:var(--text)}.section-header .chevron{width:14px;height:14px;margin-left:auto;transition:transform .2s}.section-header.open .chevron{transform:rotate(180deg)}.badge{background:var(--accent-dim);color:var(--accent);font-size:11px;font-weight:600;padding:1px 6px;border-radius:10px}.section-body{padding:0 14px 12px}.section-body.collapsed{display:none}.upload-zone{border:1.5px dashed var(--border);border-radius:8px;padding:24px 16px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s;color:var(--text-muted)}.upload-zone:hover,.upload-zone.dragover{border-color:var(--accent);background:var(--accent-dim)}.upload-zone svg{width:32px;height:32px;margin:0 auto 8px;display:block;opacity:.6}.upload-zone p{font-size:13px;line-height:1.5}.upload-zone .link{color:var(--accent)}.file-info{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--bg-3);border-radius:6px;border:1px solid var(--border)}.file-info svg{width:20px;height:20px;color:var(--accent);flex-shrink:0}.file-info>div{flex:1;overflow:hidden}.file-info-name{font-size:13px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-info-size{font-size:11px;color:var(--text-muted);font-family:var(--mono)}.btn-icon{width:28px;height:28px;display:flex;align-items:center;justify-content:center;background:none;border:none;cursor:pointer;color:var(--text-muted);border-radius:4px;transition:color .15s,background .15s;flex-shrink:0}.btn-icon:hover{color:var(--error);background:#f851491a}.btn-icon svg{width:14px;height:14px}.loading-state{display:flex;align-items:center;gap:10px;padding:12px;color:var(--text-muted);font-size:13px}.spinner{width:18px;height:18px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}@keyframes spin{to{transform:rotate(360deg)}}.error-state{padding:10px 12px;background:#f8514914;border:1px solid rgba(248,81,73,.3);border-radius:6px;color:var(--error);font-size:13px}.wall-list{display:flex;flex-direction:column;gap:4px;max-height:260px;overflow-y:auto}.wall-item{display:flex;align-items:center;gap:8px;padding:7px 10px;background:var(--bg-3);border:1px solid var(--border);border-left:3px solid var(--wall);border-radius:5px;cursor:pointer;transition:background .12s,border-color .12s}.wall-item:hover,.wall-item.selected{background:var(--wall-dim);border-color:var(--wall)}.wall-icon{width:16px;height:16px;color:var(--wall);flex-shrink:0}.wall-dims{flex:1;overflow:hidden}.wall-dims-primary{font-family:var(--mono);font-size:12px;font-weight:500;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.wall-dims-secondary{font-size:11px;color:var(--text-muted)}.layer-list{display:flex;flex-direction:column;gap:3px}.layer-item{display:flex;align-items:center;gap:8px;padding:5px 8px;border-radius:4px;cursor:pointer;font-size:12px;transition:background .12s}.layer-item:hover{background:var(--bg-3)}.layer-toggle{width:14px;height:14px;border:1.5px solid var(--border);border-radius:3px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .12s,border-color .12s}.layer-item.visible .layer-toggle{background:var(--accent);border-color:var(--accent)}.layer-toggle svg{width:10px;height:10px;color:var(--bg);display:none}.layer-item.visible .layer-toggle svg{display:block}.layer-name{font-family:var(--mono);font-size:11px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.btn-secondary{width:100%;padding:7px 12px;background:var(--bg-3);border:1px solid var(--border);border-radius:6px;color:var(--text);font-size:13px;font-family:var(--font);cursor:pointer;transition:background .12s,border-color .12s}.btn-secondary:hover{background:var(--accent-dim);border-color:var(--accent);color:var(--accent)}[hidden]{display:none!important}