:root{--bg-primary: #1A1A1A;--bg-secondary: #2D2D2D;--bg-tertiary: #3D3D3D;--fg-primary: #EEEEEE;--fg-secondary: #AAAAAA;--fg-muted: #666666;--track-rail: #888888;--track-tie: #5D4E37;--track-selected: #00FF88;--track-snap-halo: rgba(0, 255, 136, .3);--track-warning: #FF9F43;--train-primary: #FF6B6B;--train-secondary: #4ECDC4;--train-accent: #FFE66D;--button-bg: #3D3D3D;--button-hover: #4D4D4D;--button-active: #5D5D5D;--border-color: #444444;--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: rgba(255, 255, 255, .1);--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);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body.mode-edit{--current-mode-accent: var(--mode-edit-accent)}body.mode-simulate{--current-mode-accent: var(--mode-simulate-accent)}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-4{gap:16px}button{background:var(--button-bg);color:var(--fg-primary);border:1px solid var(--border-color);border-radius:6px;padding:8px 16px;font-size:14px;cursor:pointer;transition:background-color .15s ease;display:inline-flex;align-items:center;gap:6px}button:hover{background:var(--button-hover)}button:active{background:var(--button-active)}button:disabled{opacity:.5;cursor:not-allowed}.toolbar{min-height:var(--toolbar-height);background:var(--bg-secondary);border-bottom:2px solid var(--current-mode-accent);padding:8px 16px;display:flex;align-items:center;flex-wrap:wrap;gap:8px 16px;transition:border-color .3s ease}.toolbar-compact{padding:6px 12px;gap:6px 12px}.toolbar-compact .toolbar-actions{gap:4px}.toolbar-btn-icon{padding:6px 10px;min-width:unset;font-size:16px;position:relative}.toolbar-btn-icon:after{content:attr(title);position:absolute;bottom:-30px;left:50%;transform:translate(-50%);background:var(--bg-primary);color:var(--fg-primary);padding:4px 8px;border-radius:4px;font-size:12px;white-space:nowrap;opacity:0;visibility:hidden;transition:opacity .15s ease,visibility .15s ease;pointer-events:none;z-index:1000;border:1px solid var(--border-color)}.toolbar-btn-icon:hover:after{opacity:1;visibility:visible;transition-delay:.2s}.template-selector-compact{background:var(--button-bg);color:var(--fg-primary);border:1px solid var(--border-color);border-radius:6px;padding:6px 8px;font-size:14px;cursor:pointer;min-width:40px}.template-selector-compact:hover{background:var(--button-hover)}.toolbar-title{font-weight:600;font-size:16px;color:var(--track-selected);display:flex;align-items:center;gap:8px}.toolbar-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.canvas-container{width:100%;height:calc(100vh - var(--toolbar-height));position:relative}.sim-controls{position:absolute;bottom:16px;left:50%;transform:translate(-50%);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:8px;padding:8px 16px;display:flex;gap:12px;align-items:center}.play-btn{width:40px;height:40px;border-radius:50%;padding:0;display:flex;align-items:center;justify-content:center;background:var(--train-primary);border:none}.play-btn:hover{filter:brightness(1.1)}.hidden-input{display:none}.toolbar-divider{width:1px;height:24px;background:var(--border-color);margin:0 4px}.toolbar-info{font-size:12px;color:var(--fg-secondary);padding:4px 8px}button.active{background:var(--train-primary);border-color:var(--train-primary)}.viewport-warning{position:absolute;bottom:60px;left:50%;transform:translate(-50%);background:var(--track-warning);color:var(--bg-primary);padding:12px 24px;border-radius:8px;font-weight:500}.app{width:100%;height:100%;display:flex;flex-direction:column}.app-main{display:flex;flex:1;overflow:hidden}.parts-bin{width:220px;min-width:220px;background:var(--bg-secondary);border-right:1px solid var(--border-color);display:flex;flex-direction:column;overflow:hidden}.parts-bin-header{padding:12px 16px;border-bottom:1px solid var(--border-color)}.parts-bin-header h2{font-size:14px;font-weight:600;color:var(--fg-primary);margin:0}.system-tabs{display:flex;border-bottom:1px solid var(--border-color)}.system-tab{flex:1;padding:10px 12px;background:transparent;border:none;border-radius:0;font-size:12px;font-weight:500;color:var(--fg-secondary);cursor:pointer;transition:all .15s ease}.system-tab:hover{background:var(--bg-tertiary);color:var(--fg-primary)}.system-tab.active{background:var(--bg-tertiary);color:var(--track-selected);border-bottom:2px solid var(--track-selected)}.parts-bin-content{flex:1;overflow-y:auto;padding:12px}.part-section{margin-bottom:16px}.part-section h3{font-size:11px;font-weight:600;color:var(--fg-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}.part-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.part-card{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:8px;padding:8px;cursor:grab;display:flex;flex-direction:column;align-items:center;gap:4px;transition:all .15s ease;-webkit-user-select:none;user-select:none}.part-card:hover{background:var(--button-hover);border-color:var(--fg-muted);transform:translateY(-2px);box-shadow:0 4px 12px #0000004d}.part-card:active{cursor:grabbing;transform:scale(.95)}.part-preview{width:50px;height:50px;color:var(--track-rail)}.part-label{font-size:10px;color:var(--fg-secondary);text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;width:100%}.canvas-container{flex:1;height:100%;position:relative;overflow:hidden}.ghost-valid,.ghost-invalid{opacity:.6}@keyframes snap-ring-pulse{0%{transform:scale(.8);opacity:1}to{transform:scale(1.5);opacity:0}}@keyframes train-bounce{0%,to{transform:scale(1)}50%{transform:scale(1.3,.7)}}.budget-ticker{display:flex;align-items:center;gap:8px;padding:4px 12px;background:#0000004d;border-radius:6px;font-family:JetBrains Mono,monospace;font-size:.9rem}.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 .3s ease}.budget-spent{color:#888;font-size:.75rem}.budget-reset{padding:2px 6px;font-size:.75rem;background:transparent;border:none;cursor:pointer;opacity:.6;transition:opacity .2s}.budget-reset:hover{opacity:1}.debug-overlay{position:fixed;top:60px;right:10px;background:#000000e6;color:#0f0;font-family:Consolas,Monaco,Courier New,monospace;font-size:12px;padding:10px 14px;border-radius:4px;border:1px solid rgba(0,255,0,.5);z-index:9999;min-width:160px;-webkit-user-select:none;user-select:none;box-shadow:0 4px 12px #00000080}.debug-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;padding-bottom:6px;border-bottom:1px solid rgba(0,255,0,.3);font-weight:700}.debug-header button{background:none;border:none;color:#0f0;cursor:pointer;font-size:14px;padding:0 4px;opacity:.7;transition:opacity .15s}.debug-header button:hover{opacity:1;background:transparent}.debug-section{margin:4px 0}.debug-separator{border-top:1px dashed rgba(0,255,0,.2);margin:6px 0}.debug-row{display:flex;justify-content:space-between;padding:2px 0}.debug-label{color:#00ff00b3}.debug-value{font-weight:700;min-width:60px;text-align:right}.measurement-overlay{position:fixed;bottom:60px;left:10px;background:#000000e6;color:#0cf;font-family:Consolas,Monaco,Courier New,monospace;font-size:12px;padding:10px 14px;border-radius:4px;border:1px solid rgba(0,204,255,.5);z-index:9999;min-width:180px;-webkit-user-select:none;user-select:none;box-shadow:0 4px 12px #00000080}.measurement-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;padding-bottom:6px;border-bottom:1px solid rgba(0,204,255,.3);font-weight:700}.measurement-header button{background:none;border:none;color:#0cf;cursor:pointer;font-size:14px;padding:0 4px;opacity:.7;transition:opacity .15s}.measurement-header button:hover{opacity:1;background:transparent}.measurement-section{margin:4px 0}.measurement-separator{border-top:1px dashed rgba(0,204,255,.2);margin:6px 0}.measurement-row{display:flex;justify-content:space-between;padding:2px 0}.measurement-label{color:#00ccffb3}.measurement-value{font-weight:700;min-width:80px;text-align:right}.measurement-unit{color:#0cf9;font-size:10px;margin-left:2px}.measurement-empty{color:#00ccff80;font-style:italic;text-align:center;padding:8px 0}.simulation-tooltip{position:fixed;background:#000000e6;color:#4ecdc4;font-family:Consolas,Monaco,Courier New,monospace;font-size:11px;padding:8px 12px;border-radius:4px;border:1px solid rgba(78,205,196,.5);z-index:9998;min-width:140px;max-width:240px;-webkit-user-select:none;user-select:none;box-shadow:0 4px 12px #00000080;pointer-events:none;transform:translate(12px,12px)}.simulation-tooltip-header{display:flex;align-items:center;gap:6px;margin-bottom:6px;padding-bottom:4px;border-bottom:1px solid rgba(78,205,196,.3);font-weight:700;font-size:12px}.simulation-tooltip-header .icon{font-size:14px}.simulation-tooltip-section{margin:3px 0}.simulation-tooltip-row{display:flex;justify-content:space-between;padding:1px 0;gap:8px}.simulation-tooltip-label{color:#4ecdc4b3}.simulation-tooltip-value{font-weight:700;text-align:right;word-break:break-all;max-width:120px}.simulation-tooltip.train{border-color:#ff6b6b80;color:#ff6b6b}.simulation-tooltip.train .simulation-tooltip-label{color:#ff6b6bb3}.simulation-tooltip.switch{border-color:#ffd93d80;color:#ffd93d}.simulation-tooltip.switch .simulation-tooltip-label{color:#ffd93db3}.simulation-tooltip.sensor{border-color:#ffd93d80;color:#ffd93d}.simulation-tooltip.sensor .simulation-tooltip-label{color:#ffd93db3}.simulation-tooltip.signal{border-color:#00ff8880;color:#0f8}.simulation-tooltip.signal .simulation-tooltip-label{color:#00ff88b3}.simulation-tooltip-value.crashed{color:red}.simulation-tooltip-value.active{color:#0f8}.simulation-tooltip-value.inactive{color:#888}.train-panel{display:flex;flex-direction:column;gap:16px;padding:16px;height:100%;overflow-y:auto;background:var(--bg-secondary)}.train-panel-header{display:flex;justify-content:space-between;align-items:center;padding-bottom:12px;border-bottom:1px solid var(--border-color)}.train-panel-header h2{margin:0;font-size:14px;font-weight:600;color:var(--fg-primary)}.train-count{background:var(--mode-simulate-accent, #4CAF50);color:#fff;padding:2px 8px;border-radius:12px;font-size:12px;font-weight:600}.train-controls{display:flex;gap:8px}.control-btn{flex:1;padding:10px;border:none;border-radius:8px;background:var(--bg-tertiary);color:var(--fg-primary);cursor:pointer;font-size:14px;transition:all .2s ease}.control-btn:hover:not(:disabled){background:var(--button-hover)}.control-btn:disabled{opacity:.5;cursor:not-allowed}.control-btn.play-btn.active{background:var(--mode-simulate-accent, #4CAF50);color:#fff}.control-btn.add-train-btn{flex:2}.speed-control,.carriage-control{padding:12px;background:var(--bg-tertiary);border-radius:8px}.speed-control label,.carriage-control label{display:flex;flex-direction:column;gap:8px}.speed-control span,.carriage-control span{font-size:12px;color:var(--fg-secondary)}.speed-control input[type=range],.carriage-control input[type=range]{width:100%;accent-color:var(--mode-simulate-accent, #4CAF50)}.train-list{flex:1;display:flex;flex-direction:column;gap:8px;overflow-y:auto}.empty-state{text-align:center;padding:24px;color:var(--fg-muted)}.empty-state p{margin:4px 0}.empty-state .hint{font-size:12px}.train-item{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--bg-tertiary);border-radius:8px;transition:all .2s ease}.train-item:hover{background:var(--button-hover)}.train-item.crashed{background:#ff646433;border:1px solid rgba(255,100,100,.4)}.train-color{width:16px;height:16px;border-radius:50%;flex-shrink:0;border:2px solid rgba(255,255,255,.3)}.train-name{flex:1;font-size:14px;color:var(--fg-primary)}.train-name .carriage-info{font-size:11px;color:var(--fg-muted)}.train-status{font-size:14px}.remove-btn{background:none;border:none;color:var(--fg-muted);cursor:pointer;padding:4px 8px;border-radius:4px;font-size:12px}.remove-btn:hover{background:#ff646433;color:#ff6b6b}.crash-warning{padding:12px;background:#ff646433;border:1px solid rgba(255,100,100,.4);border-radius:8px;text-align:center;font-size:14px;color:#ff6b6b}.mode-toggle-container{display:flex;gap:2px;background:var(--color-surface-dark, #1a1a2e);border-radius:8px;padding:3px;margin:0 8px}.mode-toggle-btn{display:flex;align-items:center;gap:6px;padding:8px 16px;border:none;border-radius:6px;cursor:pointer;font-size:14px;font-weight:500;transition:all .2s ease;background:transparent;color:var(--color-text-muted, #888)}.mode-toggle-btn:hover:not(.active){background:var(--color-surface-hover, rgba(255, 255, 255, .1));color:var(--color-text, #fff)}.mode-toggle-btn:focus-visible{outline:2px solid var(--color-accent, #4A90D9);outline-offset:2px}.mode-toggle-btn.edit-btn.active{background:linear-gradient(135deg,#2a3f5f,#1e3a5f);color:#fff;box-shadow:0 2px 8px #4a90d94d,inset 0 1px #ffffff1a}.mode-toggle-btn.edit-btn.active .mode-icon{filter:drop-shadow(0 0 4px rgba(74,144,217,.5))}.mode-toggle-btn.simulate-btn.active{background:linear-gradient(135deg,#2f4f2f,#1e3f1e);color:#fff;box-shadow:0 2px 8px #4caf504d,inset 0 1px #ffffff1a}.mode-toggle-btn.simulate-btn.active .mode-icon{filter:drop-shadow(0 0 4px rgba(76,175,80,.5));animation:pulse-glow 2s ease-in-out infinite}@keyframes pulse-glow{0%,to{filter:drop-shadow(0 0 4px rgba(76,175,80,.5))}50%{filter:drop-shadow(0 0 8px rgba(76,175,80,.8))}}.mode-icon{font-size:16px;line-height:1}.mode-label{font-weight:600;letter-spacing:.5px;text-transform:uppercase;font-size:12px}.mode-toggle-btn.active{transform:scale(1.02)}@media(max-width:768px){.mode-toggle-btn{padding:8px 12px}.mode-label{display:none}}.onboarding-hint{position:fixed;z-index:10000;background:var(--bg-secondary);border:1px solid var(--track-selected);border-radius:8px;padding:12px 16px;max-width:280px;box-shadow:0 8px 24px #0006;animation:hint-enter .3s ease-out}.onboarding-hint:before{content:"";position:absolute;width:12px;height:12px;background:var(--bg-secondary);border:1px solid var(--track-selected);border-right:none;border-bottom:none;transform:rotate(45deg)}.onboarding-hint--arrow-left:before{left:-7px;top:50%;margin-top:-6px;transform:rotate(-45deg)}.onboarding-hint--arrow-right:before{right:-7px;top:50%;margin-top:-6px;transform:rotate(135deg)}.onboarding-hint--arrow-top:before{top:-7px;left:50%;margin-left:-6px;transform:rotate(45deg)}.onboarding-hint--arrow-bottom:before{bottom:-7px;left:50%;margin-left:-6px;transform:rotate(-135deg)}.onboarding-hint__content{color:var(--fg-primary);font-size:14px;line-height:1.5}.onboarding-hint__icon{font-size:20px;margin-right:8px;vertical-align:middle}.onboarding-hint__shortcut{display:inline-block;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:4px;padding:2px 6px;font-size:12px;font-family:monospace;color:var(--fg-secondary);margin-left:8px}.onboarding-hint__dismiss{position:absolute;top:4px;right:4px;background:transparent;border:none;color:var(--fg-muted);cursor:pointer;padding:4px;font-size:14px;line-height:1;opacity:.7;transition:opacity .15s}.onboarding-hint__dismiss:hover{opacity:1;color:var(--fg-primary)}.onboarding-toast{position:fixed;bottom:24px;right:24px;z-index:10000;background:var(--bg-secondary);border:1px solid var(--track-selected);border-radius:8px;padding:16px 20px;max-width:320px;box-shadow:0 8px 24px #0006;animation:toast-enter .4s ease-out;display:flex;align-items:center;gap:12px}.onboarding-toast--success{border-color:var(--mode-simulate-accent)}.onboarding-toast--info{border-color:var(--mode-edit-accent)}.onboarding-toast__icon{font-size:24px;flex-shrink:0}.onboarding-toast__content{flex:1}.onboarding-toast__title{font-weight:600;color:var(--fg-primary);font-size:14px;margin-bottom:2px}.onboarding-toast__message{color:var(--fg-secondary);font-size:13px}.onboarding-toast__dismiss{background:transparent;border:none;color:var(--fg-muted);cursor:pointer;padding:4px;font-size:16px;opacity:.7;transition:opacity .15s}.onboarding-toast__dismiss:hover{opacity:1}.onboarding-spotlight{position:fixed;inset:0;z-index:9999;pointer-events:none}.onboarding-spotlight__overlay{position:absolute;inset:0;background:#000000b3;animation:spotlight-fade-in .3s ease-out}.onboarding-spotlight__cutout{position:absolute;background:transparent;box-shadow:0 0 0 9999px #000000b3;border-radius:8px;pointer-events:auto}.onboarding-skip{position:fixed;bottom:16px;left:50%;transform:translate(-50%);z-index:10001;background:transparent;border:1px solid var(--border-color);color:var(--fg-muted);padding:8px 16px;border-radius:4px;font-size:12px;cursor:pointer;transition:all .15s}.onboarding-skip:hover{background:var(--bg-tertiary);color:var(--fg-secondary);border-color:var(--fg-muted)}.onboarding-pulse{animation:onboarding-pulse 2s ease-in-out infinite}@keyframes onboarding-pulse{0%,to{box-shadow:0 0 #0f86}50%{box-shadow:0 0 0 8px #0f80}}@keyframes 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{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:var(--fg-muted);pointer-events:none;animation:ghost-float 3s ease-in-out infinite}.onboarding-ghost-prompt__icon{font-size:48px;margin-bottom:16px;opacity:.6}.onboarding-ghost-prompt__text{font-size:16px;opacity:.8}.onboarding-ghost-prompt__arrow{position:absolute;left:-80px;top:50%;transform:translateY(-50%);font-size:32px;animation:arrow-bounce 1.5s ease-in-out infinite}@keyframes ghost-float{0%,to{transform:translate(-50%,-50%)}50%{transform:translate(-50%,calc(-50% - 8px))}}@keyframes arrow-bounce{0%,to{transform:translateY(-50%) translate(0)}50%{transform:translateY(-50%) translate(-8px)}}.tool-locked{opacity:.4;cursor:not-allowed!important;position:relative}.tool-locked:after{content:"🔒";position:absolute;top:-4px;right:-4px;font-size:10px}.tool-locked:hover{opacity:.5;background:var(--button-bg)!important}.tool-unlocking{animation:tool-unlock .5s ease-out forwards}@keyframes tool-unlock{0%{transform:scale(1);opacity:.4}50%{transform:scale(1.1);box-shadow:0 0 16px var(--track-selected)}to{transform:scale(1);opacity:1}}