:root{--font-cn:"Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;--num:"JetBrains Mono", "Cascadia Code", Consolas, monospace;--panel-bg:#11141cb8;--panel-border:#ffffff14;--text-primary:#f3f4f6;--text-secondary:#9ca3af;--accent:#3b82f6;--danger:#ef4444;--radius:10px;--shadow:0 4px 16px #00000040}html,body{height:100%;font-family:var(--font-cn);background:#dfe3e8;margin:0;overflow:hidden}#app{width:100vw;height:100vh;position:relative}#city-canvas{width:100%;height:100%;display:block;position:absolute;inset:0}#hud{pointer-events:none;position:absolute;inset:0}#hud>*{pointer-events:auto}.num{font-family:var(--num);font-variant-numeric:tabular-nums}.panel{background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:var(--radius);box-shadow:var(--shadow);color:var(--text-primary);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}