:root{--bg: #0b1120;--panel: #111827;--panel-2: #1f2937;--border: #273244;--text: #e5e7eb;--muted: #94a3b8;--accent: #f97316;--ok: #22c55e;--warn: #f59e0b;--err: #ef4444;--topbar-h: 48px;--sidebar-w: 320px;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font:13px/1.4 Segoe UI,system-ui,sans-serif;overflow:hidden}button,select,input{font:inherit;color:inherit}.muted{color:var(--muted)}#topbar{position:fixed;inset:0 0 auto;height:var(--topbar-h);display:flex;align-items:center;gap:10px;padding:0 12px;background:linear-gradient(180deg,#151d2e,#0f1626);border-bottom:1px solid var(--border);z-index:10;white-space:nowrap}.brand{font-weight:800;letter-spacing:.08em;color:var(--accent)}.brand span{color:var(--text);font-weight:600}.session{display:flex;gap:10px;align-items:baseline;padding-left:8px;border-left:1px solid 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