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ease}*{box-sizing:border-box}html,body{overflow-x:hidden}.auth-callback-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);font-family:Arial,sans-serif}.auth-callback-card{background:#fff;border-radius:12px;box-shadow:0 8px 32px #0000001a;padding:40px;text-align:center;max-width:400px;width:100%;margin:20px}.loading-spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #4285f4;border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 20px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-icon{font-size:48px;margin-bottom:20px}.auth-callback-card h2{color:#333;margin-bottom:15px;font-size:24px}.auth-callback-card p{color:#666;margin-bottom:25px;line-height:1.5}.retry-button{background:#4285f4;color:#fff;border:none;padding:12px 24px;border-radius:6px;cursor:pointer;font-size:16px;font-weight:500;transition:background-color .3s ease}.retry-button:hover{background:#3367d6}.retry-button:active{transform:translateY(1px)}