:root{--bg:#0f172a;--panel:#1e293b;--panel-2:#111827;--text:#e2e8f0;--muted:#94a3b8;--accent:#6366f1;--accent-hover:#4f46e5;--border:#334155;--ok:#22c55e;--err:#ef4444}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}a{color:var(--accent);text-decoration:none}.container{max-width:1080px;margin:0 auto;padding:0 20px}.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.nav .brand{font-weight:700;font-size:20px;color:var(--text)}.nav .links a{margin-left:18px;color:var(--muted)}.nav .links a:hover{color:var(--text)}.btn{display:inline-block;background:var(--accent);color:#fff;border:none;padding:10px 18px;border-radius:8px;font-size:15px;cursor:pointer}.btn:hover{background:var(--accent-hover)}.btn.secondary{background:transparent;border:1px solid var(--border);color:var(--text)}.hero{padding:80px 0 40px;text-align:center}.hero h1{font-size:44px;margin:0 0 16px}.hero p{font-size:18px;color:var(--muted);max-width:620px;margin:0 auto 28px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:18px;gap:18px;padding:30px 0}.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:22px}.card h3{margin:0 0 8px}.card p{color:var(--muted);margin:0}.auth-wrap{max-width:400px;margin:60px auto;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:32px}.auth-wrap h2{margin-top:0}.field{margin-bottom:16px}.field label{display:block;margin-bottom:6px;color:var(--muted);font-size:14px}.field input{width:100%;padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:var(--panel-2);color:var(--text);font-size:15px}.error{color:var(--err);font-size:14px;margin-bottom:12px}.playground{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px;height:calc(100vh - 140px);padding:16px 20px}.pane{background:var(--panel);border:1px solid var(--border);border-radius:10px;display:flex;flex-direction:column;overflow:hidden}.pane-header{padding:10px 14px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:10px}.pane-body{flex:1 1;overflow:auto}.output{padding:14px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:13px;white-space:pre-wrap;color:var(--text)}.toolbar{display:flex;align-items:center;gap:10px;padding:12px 20px}.toolbar select,select{padding:8px 10px;border-radius:8px;border:1px solid var(--border);background:var(--panel-2);color:var(--text)}.badge{padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}.badge.ok{background:rgba(34,197,94,.15);color:var(--ok)}.badge.err{background:rgba(239,68,68,.15);color:var(--err)}