:root{--bg: #0c0c0c;--surface: #151515;--surface2: #1c1c1c;--border: #262626;--border2: #333;--text: #e0e0e0;--muted: #999;--dim: #555;--accent: #4ade80;--accent-dim: rgba(74,222,128,.1);--error: #f87171;--error-dim: rgba(248,113,113,.1);--warn: #facc15;--warn-dim: rgba(250,204,21,.08);--blue: #60a5fa;--mono: "JetBrains Mono", "Fira Code", monospace;--sans: "Inter", system-ui, sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:14px;background:var(--bg);color:var(--text)}body{font-family:var(--sans);min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}::selection{background:var(--accent);color:#000}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:44px;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0}.brand{font-family:var(--mono);font-size:14px;font-weight:600;color:var(--accent);letter-spacing:.03em}.topbar nav{display:flex;gap:4px}.topbar nav a{font-size:13px;color:var(--muted);padding:6px 14px;border-radius:6px;transition:background .15s,color .15s}.topbar nav a:hover{background:#ffffff0d;color:var(--text);text-decoration:none}.topbar nav a.active{color:var(--text);background:#ffffff0f}.intro{padding:24px 20px 20px;border-bottom:1px solid var(--border);background:var(--surface)}.intro h1{font-size:18px;font-weight:700;margin-bottom:6px;font-family:var(--sans)}.intro p{font-size:13px;color:var(--muted);max-width:680px;line-height:1.6}.workspace{display:grid;grid-template-columns:minmax(320px,1fr) 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