:root{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-tertiary:#3d3d3d;--fg-primary:#eee;--fg-secondary:#b3b3b3;--fg-muted:#999;--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;--button-primary-bg:#2f6db5;--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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