*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:#000;min-height:100vh;padding:20px;color:#fff}.container{max-width:1200px;margin:0 auto}.card{background:#1a1a1a;border-radius:12px;padding:24px;box-shadow:0 4px 6px #00000080;margin-bottom:20px;border:1px solid #333333}.btn{padding:10px 20px;border:none;border-radius:6px;cursor:pointer;font-size:14px;font-weight:500;transition:all .3s ease}.btn-primary{background:#333;color:#fff;border:1px solid #555555}.btn-primary:hover{background:#444;transform:translateY(-2px);box-shadow:0 4px 8px #ffffff1a}.btn:disabled{opacity:.6;cursor:not-allowed}.spinner{border:3px solid #333333;border-top:3px solid #ffffff;border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite;margin:20px auto}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (max-width: 768px){body{padding:10px}.card{padding:16px}}