:root{--bg:#101217;--panel:#171a21;--panel2:#20242d;--text:#f3f5f7;--muted:#aab1bd;--accent:#f3c544;--danger:#ff6b6b;--line:#2d3340;--ok:#5fd08b;--shadow:0 20px 60px rgba(0,0,0,.35)}*{box-sizing:border-box}html,body,#rrtb-app{min-height:100%;margin:0}body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}button,input,select{font:inherit}.app{min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;gap:18px;align-items:center;padding:14px 18px;background:rgba(16,18,23,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.brand{min-width:260px}.brand h1{font-size:18px;margin:0}.brand p{margin:3px 0 0;color:var(--muted);font-size:12px}.tabs{display:flex;gap:6px;flex:1;flex-wrap:wrap}.tab,.btn{border:1px solid var(--line);background:var(--panel2);color:var(--text);border-radius:9px;padding:9px 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