:root {
            --color-fondo: #0f1c2e;
            --color-panel: #1e2d44;
            --color-borde: #34495e;
            --color-texto: #ecf0f1;
            --color-boton: #3b5998;
            --color-error: #e74c3c;
            --color-success: #2ecc71;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            background-color: var(--color-fondo);
            color: var(--color-texto);
            font-family: 'Segoe UI', sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
            background-image: linear-gradient(135deg, var(--color-fondo) 0%, #1a2b3d 100%);
        }

        .login-container {
            background-color: var(--color-panel);
            padding: 30px;
            border-radius: 12px;
            width: 100%;
            max-width: 400px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
            position: relative;
            overflow: hidden;
        }

        .login-container::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(59,89,152,0.1) 0%, transparent 70%);
            z-index: -1;
        }

        .logo {
            width: 120px;
            margin: 0 auto 20px;
            transition: transform 0.3s;
        }

        .logo:hover {
            transform: scale(1.05);
        }

        .login-container h1 {
            font-size: 2rem;
            margin-bottom: 10px;
        }

        .login-container p {
            font-size: 1.2rem;
            margin-bottom: 30px;
        }

        .form-group {
            margin-bottom: 20px;
            position: relative;
        }

        .form-input {
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            border: 1px solid var(--color-borde);
            border-radius: 8px;
            padding: 12px 15px;
            width: 100%;
            font-size: 1.1rem;
            transition: all 0.3s;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--color-boton);
            box-shadow: 0 0 0 3px rgba(59, 89, 152, 0.3);
        }

        .input-icon {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: rgba(255,255,255,0.7);
        }

        .password-toggle {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            cursor: pointer;
            color: rgba(255,255,255,0.7);
        }

        .btn-login {
            background-color: var(--color-boton);
            color: white;
            border: none;
            border-radius: 8px;
            padding: 14px;
            width: 100%;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 10px;
        }

        .btn-login:hover {
            background-color: #2d4373;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .error-message {
            background-color: var(--color-error);
            color: white;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 20px;
            animation: fadeIn 0.5s;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
            20%, 40%, 60%, 80% { transform: translateX(5px); }
        }

        .footer-info {
            margin-top: 30px;
            font-size: 1rem;
            color: rgba(236, 240, 241, 0.8);
            line-height: 1.6;
        }

        .security-badge {
            margin-top: 20px;
            font-size: 0.8rem;
            color: rgba(236, 240, 241, 0.6);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 5px;
        }

        @media (max-width: 480px) {
            .login-container {
                padding: 20px;
            }

            .logo {
                width: 100px;
            }

            .login-container h1 {
                font-size: 1.6rem;
            }
            
            .login-container p {
                font-size: 1rem;
                margin-bottom: 20px;
            }
        }