* { margin: 0; padding: 0; box-sizing: border-box; }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .login-container {
            background: white;
            border-radius: 1rem;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            overflow: hidden;
            max-width: 900px;
            width: 100%;
            display: grid;
            grid-template-columns: 1fr 1fr;
        }

        .login-left {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 3rem 2rem;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
        }

        .login-left h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }

        .login-left p {
            font-size: 1rem;
            opacity: 0.9;
            line-height: 1.6;
        }

        .login-right {
            padding: 3rem 2rem;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .login-right h1 {
            font-size: 1.75rem;
            font-weight: 700;
            color: #1f2937;
            margin-bottom: 2rem;
            text-align: center;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-group label {
            display: block;
            font-weight: 600;
            color: #374151;
            margin-bottom: 0.5rem;
            font-size: 0.95rem;
        }

        .form-group input {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid #d1d5db;
            border-radius: 0.5rem;
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .form-group input:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            font-size: 0.9rem;
        }

        .form-options label {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin: 0;
            cursor: pointer;
        }

        .form-options a {
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
        }

        .form-options a:hover {
            text-decoration: underline;
        }

        .btn-login {
            width: 100%;
            padding: 0.75rem;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 1rem;
        }

        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
        }

        .btn-login.loading {
            opacity: 0.7;
            cursor: not-allowed;
        }

        .divider {
            text-align: center;
            margin: 1.5rem 0;
            color: #9ca3af;
            font-size: 0.9rem;
        }

        .divider::before,
        .divider::after {
            content: '';
            display: inline-block;
            width: 40%;
            height: 1px;
            background: #d1d5db;
            vertical-align: middle;
        }

        .divider::before {
            margin-right: 0.5rem;
        }

        .divider::after {
            margin-left: 0.5rem;
        }

        .social-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }

        .social-btn {
            padding: 0.75rem;
            border: 1px solid #d1d5db;
            border-radius: 0.5rem;
            background: white;
            color: #374151;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            font-size: 0.9rem;
        }

        .social-btn:hover {
            border-color: #667eea;
            background: #f9fafb;
        }

        .signup-link {
            text-align: center;
            color: #6b7280;
            font-size: 0.9rem;
        }

        .signup-link a {
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
        }

        .signup-link a:hover {
            text-decoration: underline;
        }

        .error-message {
            color: #dc2626;
            font-size: 0.875rem;
            margin-top: 0.25rem;
            display: none;
        }

        .success-message {
            color: #16a34a;
            font-size: 0.875rem;
            margin-top: 0.25rem;
            display: none;
        }

        @media (max-width: 768px) {
            .login-container {
                grid-template-columns: 1fr;
            }

            .login-left {
                display: none;
            }

            .login-right {
                padding: 2rem 1.5rem;
            }

            .login-right h1 {
                font-size: 1.5rem;
            }

            .social-buttons {
                grid-template-columns: 1fr;
            }
        }