:root{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-tertiary:#3d3d3d;--fg-primary:#eee;--fg-secondary:#aaa;--fg-muted:#666;--track-rail:#888;--track-tie:#5d4e37;--track-selected:#0f8;--track-snap-halo:#00ff884d;--track-warning:#ff9f43;--train-primary:#ff6b6b;--train-secondary:#4ecdc4;--train-accent:#ffe66d;--button-bg:#3d3d3d;--button-hover:#4d4d4d;--button-active:#5d5d5d;--border-color:#444;--toolbar-height:48px;--mode-edit-accent:#4a90d9;--mode-edit-bg:#2a3f5f;--mode-simulate-accent:#4caf50;--mode-simulate-bg:#2f4f2f;--color-surface-dark:#1a1a2e;--color-surface-hover:#ffffff1a;--color-text-muted:#888;--color-text:#fff;--color-accent:#4a90d9;--current-mode-accent:var(--mode-edit-accent)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{width:100%;height:100%;overflow:hidden}body{background:var(--bg-primary);color:var(--fg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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8px;font-size:14px}.template-selector-compact:hover{background:var(--button-hover)}.toolbar-title{color:var(--track-selected);align-items:center;gap:8px;font-size:16px;font-weight:600;display:flex}.toolbar-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.canvas-container{width:100%;height:calc(100vh - var(--toolbar-height));position:relative}.sim-controls{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:8px;align-items:center;gap:12px;padding:8px 16px;display:flex;position:absolute;bottom:16px;left:50%;transform:translate(-50%)}.play-btn{background:var(--train-primary);border:none;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;padding:0;display:flex}.play-btn:hover{filter:brightness(1.1)}.hidden-input{display:none}.toolbar-divider{background:var(--border-color);width:1px;height:24px;margin:0 4px}.toolbar-info{color:var(--fg-secondary);padding:4px 8px;font-size:12px}button.active{background:var(--train-primary);border-color:var(--train-primary)}.viewport-warning{background:var(--track-warning);color:var(--bg-primary);border-radius:8px;padding:12px 24px;font-weight:500;position:absolute;bottom:60px;left:50%;transform:translate(-50%)}.app{flex-direction:column;width:100%;height:100%;display:flex}.app-main{flex:1;display:flex;overflow:hidden}.parts-bin{background:var(--bg-secondary);border-right:1px solid var(--border-color);flex-direction:column;width:220px;min-width:220px;display:flex;overflow:hidden}.parts-bin-header{border-bottom:1px solid var(--border-color);padding:12px 16px}.parts-bin-header h2{color:var(--fg-primary);margin:0;font-size:14px;font-weight:600}.system-tabs{border-bottom:1px solid var(--border-color);display:flex}.system-tab{color:var(--fg-secondary);cursor:pointer;background:0 0;border:none;border-radius:0;flex:1;padding:10px 12px;font-size:12px;font-weight:500;transition:all 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#0000004d}.part-card:active{cursor:grabbing;transform:scale(.95)}.part-preview{width:50px;height:50px;color:var(--track-rail)}.part-label{color:var(--fg-secondary);text-align:center;white-space:nowrap;text-overflow:ellipsis;width:100%;font-size:10px;overflow:hidden}.canvas-container{flex:1;height:100%;position:relative;overflow:hidden}.ghost-valid,.ghost-invalid{opacity:.6}@keyframes snap-ring-pulse{0%{opacity:1;transform:scale(.8)}to{opacity:0;transform:scale(1.5)}}@keyframes train-bounce{0%,to{transform:scale(1)}50%{transform:scale(1.3,.7)}}.budget-ticker{background:#0000004d;border-radius:6px;align-items:center;gap:8px;padding:4px 12px;font-family:JetBrains Mono,monospace;font-size:.9rem;display:flex}.budget-ticker.healthy .budget-balance{color:#0f8}.budget-ticker.warning .budget-balance{color:#ffd93d}.budget-ticker.danger .budget-balance{color:#ff6b6b}.budget-balance{font-weight:600;transition:color 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0}.debug-row{justify-content:space-between;padding:2px 0;display:flex}.debug-label{color:#00ff00b3}.debug-value{text-align:right;min-width:60px;font-weight:700}.measurement-overlay{color:#0cf;z-index:9999;-webkit-user-select:none;user-select:none;background:#000000e6;border:1px solid #00ccff80;border-radius:4px;min-width:180px;padding:10px 14px;font-family:Consolas,Monaco,Courier New,monospace;font-size:12px;position:fixed;bottom:60px;left:10px;box-shadow:0 4px 12px #00000080}.measurement-header{border-bottom:1px solid #00ccff4d;justify-content:space-between;align-items:center;margin-bottom:8px;padding-bottom:6px;font-weight:700;display:flex}.measurement-header button{color:#0cf;cursor:pointer;opacity:.7;background:0 0;border:none;padding:0 4px;font-size:14px;transition:opacity .15s}.measurement-header button:hover{opacity:1;background:0 0}.measurement-section{margin:4px 0}.measurement-separator{border-top:1px dashed #0cf3;margin:6px 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var(--track-selected);border-bottom:none;border-right:none;width:12px;height:12px;position:absolute;transform:rotate(45deg)}.onboarding-hint--arrow-left:before{margin-top:-6px;top:50%;left:-7px;transform:rotate(-45deg)}.onboarding-hint--arrow-right:before{margin-top:-6px;top:50%;right:-7px;transform:rotate(135deg)}.onboarding-hint--arrow-top:before{margin-left:-6px;top:-7px;left:50%;transform:rotate(45deg)}.onboarding-hint--arrow-bottom:before{margin-left:-6px;bottom:-7px;left:50%;transform:rotate(-135deg)}.onboarding-hint__content{color:var(--fg-primary);font-size:14px;line-height:1.5}.onboarding-hint__icon{vertical-align:middle;margin-right:8px;font-size:20px}.onboarding-hint__shortcut{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--fg-secondary);border-radius:4px;margin-left:8px;padding:2px 6px;font-family:monospace;font-size:12px;display:inline-block}.onboarding-hint__dismiss{color:var(--fg-muted);cursor:pointer;opacity:.7;background:0 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hint-enter{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes toast-enter{0%{opacity:0;transform:translate(24px)}to{opacity:1;transform:translate(0)}}@keyframes spotlight-fade-in{0%{opacity:0}to{opacity:1}}.onboarding-ghost-prompt{text-align:center;color:var(--fg-muted);pointer-events:none;animation:3s ease-in-out infinite ghost-float;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.onboarding-ghost-prompt__icon{opacity:.6;margin-bottom:16px;font-size:48px}.onboarding-ghost-prompt__text{opacity:.8;font-size:16px}.onboarding-ghost-prompt__arrow{font-size:32px;animation:1.5s ease-in-out infinite arrow-bounce;position:absolute;top:50%;left:-80px;transform:translateY(-50%)}@keyframes ghost-float{0%,to{transform:translate(-50%,-50%)}50%{transform:translate(-50%,calc(-50% - 8px))}}@keyframes 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