:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#f8f9fa;background-color:#0f172a;line-height:1.4}body{margin:0;min-height:100vh;background:radial-gradient(circle at top,#1d3557,#0f172a 65%)}.app-shell{max-width:1200px;margin:0 auto;padding:2rem 1.5rem 3rem}header{text-align:center;margin-bottom:1.5rem}header h1{margin:0 0 .5rem;font-size:2.2rem}main{display:grid;grid-template-columns:360px 1fr;gap:1.5rem}.auth-panel,.game-panel{background:#0f172abf;border:1px solid rgba(148,163,184,.2);border-radius:16px;padding:1.5rem;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 25px 45px #02061766}.tabs{display:inline-flex;border:1px solid rgba(148,163,184,.3);border-radius:12px;overflow:hidden;margin-bottom:1rem}.tabs button{background:transparent;color:#cbd5f5;border:none;padding:.6rem 1rem;font-size:.95rem;cursor:pointer}.tabs button.active{background:#2563eb;color:#fff}form{display:flex;flex-direction:column;gap:.75rem}label{display:flex;flex-direction:column;font-size:.85rem;color:#cbd5f5;gap:.35rem}input,select{border-radius:10px;border:1px solid rgba(148,163,184,.5);padding:.6rem;background:#0f172a80;color:#f8f9fa}.checkbox-row{flex-direction:row;align-items:center}.checkbox-row input{width:auto;margin-right:.5rem}button.primary{border:none;border-radius:10px;padding:.75rem 1rem;background:linear-gradient(135deg,#34d399,#2563eb);color:#fff;font-weight:600;cursor:pointer}button.secondary{border:1px solid rgba(148,163,184,.5);background:transparent;color:#e2e8f0;border-radius:10px;padding:.6rem 1rem;cursor:pointer}.status{margin-top:1rem;font-size:.9rem;color:#cbd5f5}.game-frame{width:100%;height:640px;border:none;border-radius:12px;background:#000}.game-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;color:#94a3b8}@media (max-width: 960px){main{grid-template-columns:1fr}.game-panel{min-height:500px}}