:root{--bg: #f3f5f8;--panel: #ffffff;--border: #dde2ea;--text: #1f2933;--muted: #6b7785;--accent: #2b2a6f;--accent-soft: #ecebf8;--orange: #f47b20;--orange-soft: #fff1e6;--sim: #1a9c55;--sim-stop: #d64545;--warn: #b7791f;--code-bg: #ffffff;--code-text: #1f2933;--code-panel-width: 520px;font-family:Segoe UI,system-ui,-apple-system,Roboto,sans-serif}*{box-sizing:border-box}html,body{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-size:14px;display:flex;flex-direction:column;overflow:hidden}[hidden]{display:none!important}#topbar{display:flex;align-items:center;gap:10px;height:52px;padding:0 14px;background:#2b2a6f;border-bottom:1px solid #23225c;flex:none;position:relative}#topbar .menu-btn{color:#fff;font-weight:600}#topbar #save-state{display:none}#topbar .menu-btn:hover,#topbar .menu-btn.open{background:#ffffff24}#topbar .project-name{background:#ffffff1a;border-color:#ffffff4d;color:#fff}#topbar .project-name:hover{border-color:#fff9}#topbar 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