.app-header{display:flex;align-items:center;justify-content:space-between;padding:14px 28px;background:#0d0f22;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.app-brand{font-size:1.2rem;font-weight:800;color:var(--yellow);letter-spacing:.5px}.app-user{font-size:.85rem;color:var(--muted)}.btn-logout{background:none;border:none;color:var(--cyan);font-size:.85rem;cursor:pointer;padding:0;text-decoration:underline}.app-main{max-width:860px;margin:0 auto;padding:28px 20px 60px}.tab-nav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}.tab-btn{background:var(--card);border:1px solid var(--border);color:var(--muted);padding:8px 16px;border-radius:8px;font-size:.85rem;transition:all .2s}.tab-btn:hover{color:var(--cyan);border-color:var(--cyan-dim)}.tab-btn.active{background:var(--cyan);color:#000;border-color:var(--cyan);font-weight:700}.tab-content{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.tab-title{font-size:1.1rem;color:var(--cyan);margin-bottom:16px}.capability-desc{background:#0a0e1e;border:1px solid var(--border);border-radius:6px;padding:12px 16px;font-size:.88rem;color:var(--muted);line-height:1.6;margin-bottom:16px}.capability-desc strong{color:var(--white)}.error-banner{background:#2a0a14;border:1px solid var(--red);color:var(--red);padding:10px 14px;border-radius:6px;font-size:.88rem;margin-top:12px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0a0c1a;--card: #111428;--border: #1e2460;--cyan: #00dcff;--cyan-dim: #007a90;--yellow: #ffd700;--white: #f0f4ff;--muted: #8892b0;--red: #ff4466;--green: #00e096;--radius: 10px}body{background:var(--bg);color:var(--white);font-family:Segoe UI,system-ui,sans-serif;min-height:100vh}button{cursor:pointer;font-family:inherit}textarea,input{font-family:inherit}