:root{--bg-void: #121315;--bg-panel: rgba(21, 22, 25, .91);--bg-panel-solid: #18191c;--bg-card: rgba(33, 35, 40, .85);--bg-card-hover: rgba(46, 49, 56, .95);--border-hairline: rgba(255, 255, 255, .13);--border-strong: rgba(255, 255, 255, .28);--text-primary: #ece9e2;--text-secondary: #a8a49c;--text-muted: #726f69;--accent-orange: #ff5722;--accent-amber: #f59e0b;--accent-teal: #2dd4bf;--accent-blue: #38bdf8;--danger-red: #ef4444;--font-sans: "Space Grotesk", -apple-system, BlinkMacSystemFont, sans-serif;--font-display: "Syne", "Space Grotesk", sans-serif;--font-mono: "JetBrains Mono", monospace}*{box-sizing:border-box;margin:0;padding:0;-webkit-user-select:none;user-select:none}html,body{width:100%;height:100%;overflow:hidden;background:var(--bg-void);color:var(--text-primary);font-family:var(--font-sans);font-size:13px;-webkit-font-smoothing:antialiased}#app-shell{position:relative;width:100vw;height:100vh;overflow:hidden}#viewport-container{position:absolute;top:0;right:0;bottom:0;left:0;z-index:1}#city-canvas{width:100%;height:100%;display:block;cursor:grab;transition:filter .35s ease}#city-canvas:active{cursor:grabbing}#app-shell.filter-herve_mono #city-canvas{filter:grayscale(100%) contrast(148%) brightness(96%)}#app-shell.filter-blueprint #city-canvas{filter:saturate(135%) contrast(118%) hue-rotate(-6deg)}#app-shell.filter-constructivist #city-canvas{filter:contrast(155%) saturate(145%) 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var(--border-strong);color:var(--text-secondary);font-family:var(--font-mono);font-size:10px;padding:4px 7px;cursor:pointer}.elev-btn.active{background:var(--accent-teal);color:#111;font-weight:700}.exp-exit-btn{background:var(--accent-orange);color:#111;border:none;font-family:var(--font-mono);font-weight:700;font-size:10.5px;padding:6px 10px;cursor:pointer}.tool-toast{position:absolute;bottom:72px;left:50%;transform:translate(-50%);z-index:22;background:#121317f2;border:1px solid var(--accent-blue);color:var(--text-primary);font-family:var(--font-mono);font-size:11.5px;padding:7px 14px;pointer-events:none}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#000000c2;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;padding:24px}.modal-card{width:min(920px,95vw);background:#181a1e;border:1px solid var(--border-strong);box-shadow:0 24px 64px #000000d9}.modal-header{padding:16px 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