:root{--primary: #2563eb;--primary-dark: #1e40af;--bg: #f3f4f6;--surface: #ffffff;--text: #1f2937;--muted: #6b7280;--border: #e5e7eb;--green: #16a34a;--amber: #f59e0b;--red: #dc2626;--radius: 10px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:14px;color:var(--text);background:var(--bg)}button{font:inherit;cursor:pointer}input,textarea,select{font:inherit;color:inherit}.app{display:flex;flex-direction:column;height:100vh}.topbar{display:flex;align-items:center;gap:16px;padding:0 16px;height:54px;background:#111827;color:#f9fafb;flex-shrink:0}.brand{font-weight:800;font-size:16px;letter-spacing:-.3px}.brand span{color:#60a5fa}.brand.big{font-size:22px;margin-bottom:4px}.site-select{background:#1f2937;color:#f9fafb;border:1px solid #374151;border-radius:8px;padding:5px 8px}.site-name{color:#9ca3af;font-weight:600}.tabs{display:flex;gap:4px;margin-left:8px}.tab{background:none;border:0;color:#9ca3af;padding:8px 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