:root {
            --ckde-primary: #003366;  
            --ckde-secondary: #004080;
            --ckde-accent: #0070C0;
            --ckde-light: #E6F2FF;
            --error: #C00000;
            --text-primary: #333333;
            --text-secondary: #555555;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #000000cb;
            background-image: url('../img/fondo.jpg');
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .login-container {
            width: 100%;
            max-width: 450px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            overflow: hidden;
            border: 1px solid #e0e0e0;
        }
        
        .login-header {
            background: var(--ckde-primary);
            color: white;
            padding: 28px;
            text-align: center;
            border-bottom: 4px solid var(--ckde-accent);
        }
        
        .login-header img {
            height: 60px;
            margin-bottom: 15px;
            filter: brightness(0) invert(1);
        }
        
        .login-header h1 {
            font-size: 1.6rem;
            font-weight: 500;
            letter-spacing: 0.5px;
        }
        
        .login-header p {
            font-size: 0.9rem;
            opacity: 0.9;
            margin-top: 5px;
        }
        
        .login-form {
            padding: 35px 40px;
        }
        
        .input-group {
            margin-bottom: 22px;
            position: relative;
        }
        
        .input-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--text-primary);
            font-size: 0.95rem;
        }
        
        .input-group input {
            width: 100%;
            padding: 13px 15px;
            border: 1px solid #d1d5db;
            border-radius: 4px;
            font-size: 1rem;
            transition: all 0.2s;
            background-color: #f9f9f9;
        }
        
        .input-group input:focus {
            border-color: var(--ckde-accent);
            outline: none;
            box-shadow: 0 0 0 2px rgba(0, 112, 192, 0.15);
            background-color: white;
        }
        
        .input-group .fa {
            position: absolute;
            right: 15px;
            top: 40px;
            color: #a0a0a0;
            font-size: 0.9rem;
        }
        
        .forgot-password {
            display: block;
            text-align: right;
            margin-bottom: 25px;
            color: var(--ckde-accent);
            text-decoration: none;
            font-size: 0.85rem;
            font-weight: 500;
        }
        
        .forgot-password:hover {
            text-decoration: underline;
        }
        
        .login-btn {
            width: 100%;
            padding: 14px;
            background: var(--ckde-primary);
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.2s;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-top: 10px;
        }
        
        .login-btn:hover {
            background: var(--ckde-secondary);
        }
        
        .login-btn:active {
            transform: translateY(1px);
        }
        
        .error-message {
            color: var(--error);
            font-size: 0.85rem;
            margin-top: 6px;
            display: none;
            font-weight: 500;
        }
        
        .footer-links {
            margin-top: 25px;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-secondary);
            border-top: 1px solid #eee;
            padding-top: 20px;
        }
        
        .footer-links a {
            color: var(--ckde-accent);
            text-decoration: none;
            font-weight: 500;
            margin: 0 5px;
        }
        
        .footer-links a:hover {
            text-decoration: underline;
        }
        
        .security-notice {
            font-size: 0.75rem;
            color: #777;
            text-align: center;
            margin-top: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .security-notice i {
            margin-right: 5px;
            color: var(--ckde-accent);
        }
        
        @media (max-width: 480px) {
            .login-container {
                margin: 0 20px;
                border-radius: 6px;
            }
            
            .login-header {
                padding: 24px 20px;
            }
            
            .login-header h1 {
                font-size: 1.4rem;
            }
            
            .login-form {
                padding: 30px 25px;
            }
        }