:root {
            --primary: #3f51b5;
            --primary-dark: #303f9f;
            --primary-light: #c5cae9;
            --accent: #ff4081;
            --text-primary: #212121;
            --text-secondary: #757575;
            --light-bg: #f5f7fa;
            --card-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
        
        body {
            background-color: var(--light-bg);
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            margin: 0;
            padding: 0;
            background-image: linear-gradient(135deg, var(--primary-light) 0%, var(--light-bg) 100%);
        }
        
        .login-container {
            width: 100%;
            max-width: 500px;
            padding: 20px;
            animation: fadeIn 0.5s ease-in-out;
        }
        
        .login-card {
            background: white;
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            padding: 35px;
            transition: transform 0.3s ease;
        }
        
        .login-card:hover {
            transform: translateY(-5px);
        }
        
        .login-header {
            text-align: center;
            margin-bottom: 30px;
        }
        
        .login-header h2 {
            color: var(--primary);
            font-weight: 700;
            margin-bottom: 8px;
            position: relative;
            padding-bottom: 15px;
        }
        
        .login-header h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: var(--accent);
            border-radius: 3px;
        }
        
        .form-group {
            margin-bottom: 24px;
            position: relative;
        }
        
        .form-group label {
            font-weight: 500;
            color: var(--text-primary);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .form-group label i {
            font-size: 16px;
            color: var(--primary);
            width: 20px;
        }
        
        input[type="text"],
        input[type="password"] {
            width: 100%;
            height: 48px;
            border-radius: 8px;
            border: 1.5px solid #e1e5eb;
            padding: 10px 15px;
            font-size: 15px;
            transition: all 0.3s;
        }
        
        input[type="text"]:focus,
        input[type="password"]:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(63, 81, 181, 0.15);
            outline: none;
        }
        
        .captcha-group {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 8px;
        }
        
        .captcha-group input {
            flex: 1;
        }
        
        .captcha-group img {
            height: 48px;
            border: 1.5px solid #e1e5eb;
            border-radius: 8px;
        }
        
        .captcha-group button {
            height: 48px;
            width: 48px;
            border: none;
            border-radius: 8px;
            background-color: #f5f7fa;
            font-size: 18px;
            cursor: pointer;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .captcha-group button:hover {
            background-color: var(--primary-light);
            color: var(--primary);
        }
        
        .form-check {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }
        
        .form-check-input {
            margin-right: 10px;
            width: 18px;
            height: 18px;
            cursor: pointer;
        }
        
        .form-check-label {
            color: var(--text-secondary);
            cursor: pointer;
        }
        
        .btn-login {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border: none;
            padding: 14px;
            font-size: 16px;
            font-weight: 600;
            width: 100%;
            border-radius: 8px;
            margin-top: 15px;
            color: white;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 10px rgba(63, 81, 181, 0.25);
        }
        
        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(63, 81, 181, 0.35);
        }
        
        .login-footer {
            margin-top: 25px;
            padding-top: 20px;
            border-top: 1px solid #e1e5eb;
            text-align: center;
            font-size: 14px;
            color: var(--text-secondary);
        }
        
        .login-footer p {
            margin: 8px 0;
        }
        
        .login-footer a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.2s;
        }
        
        .login-footer a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        
        .alert {
            margin-bottom: 24px;
            padding: 14px 16px;
            border-radius: 8px;
            font-size: 14px;
            border: none;
            display: flex;
            align-items: center;
        }
        
        .alert-danger {
            background-color: #ffebee;
            color: #c62828;
        }
        
        .alert i {
            margin-right: 10px;
            font-size: 18px;
        }
        
        .password-toggle {
            position: absolute;
            right: 12px;
            top: 38px;
            cursor: pointer;
            color: var(--text-secondary);
        }
        
        .password-toggle:hover {
            color: var(--primary);
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /* Responsive adjustments */
        @media (max-width: 576px) {
            .login-container {
                padding: 15px;
            }
            
            .login-card {
                padding: 25px 20px;
            }
            
            .captcha-group {
                flex-direction: column;
                align-items: stretch;
            }
            
            .captcha-group button {
                width: 100%;
                margin-top: 10px;
            }
        }