/* Variables y reset */
        :root {
            --color-primario: #3498db;
            --color-primario-hover: #2980b9;
            --color-error: #e74c3c;
            --color-exito: #2ecc71;
            --color-fondo: #f0f2f5;
            --color-texto: #333;
            --color-borde: #ddd;
            --sombra-suave: 0 2px 5px rgba(0,0,0,0.1);
            --sombra-fuerte: 0 5px 15px rgba(0,0,0,0.1);
            --radio-borde: 10px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Arial, sans-serif;
        }
        
        body {
            background-color: var(--color-fondo);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            color: var(--color-texto);
        }
        
        /* Header */
        header {
            background-color: white;
            padding: 15px 20px;
            box-shadow: var(--sombra-suave);
            display: flex;
            align-items: center;
            gap: 20px;
        }
        
        .Escudo_institucion {
            height: 50px;
            width: auto;
            border-radius: 5px;
        }
        
        .titulo-institucion {
            color: var(--color-texto);
            font-size: 1.5rem;
            font-weight: 600;
        }
        
        /* Sistema de alertas */
        .contenedor-alertas {
            max-width: 400px;
            width: 100%;
            margin: 20px auto 0;
            padding: 0 20px;
        }
        
        .alerta {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
            animation: slideDown 0.3s ease-out;
        }
        
        .alerta.error {
            background-color: #ffebee;
            border: 1px solid var(--color-error);
            color: #b71c1c;
        }
        
        .alerta.exito {
            background-color: #e8f5e9;
            border: 1px solid var(--color-exito);
            color: #1b5e20;
        }
        
        .alerta-icono {
            font-size: 1.2rem;
            flex-shrink: 0;
            margin-top: 2px;
        }
        
        .alerta-contenido {
            flex: 1;
        }
        
        .alerta-contenido strong {
            display: block;
            margin-bottom: 5px;
            font-size: 0.95rem;
        }
        
        .alerta-contenido p {
            font-size: 0.9rem;
            line-height: 1.4;
            margin: 0;
        }
        
        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        /* Sección principal */
        section {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }
        
        main {
            width: 100%;
            max-width: 400px;
        }
        
        /* Formulario */
        .card-formulario {
            background-color: white;
            padding: 30px;
            border-radius: var(--radio-borde);
            box-shadow: var(--sombra-fuerte);
        }
        
        .titulo-formulario {
            color: #2c3e50;
            margin-bottom: 25px;
            text-align: center;
            font-size: 1.5rem;
            font-weight: 600;
        }
        
        .grupo-formulario {
            margin-bottom: 20px;
        }
        
        .grupo-formulario label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 600;
            font-size: 0.95rem;
        }
        
        .input-formulario {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--color-borde);
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.3s;
        }
        
        .input-formulario:focus {
            outline: none;
            border-color: var(--color-primario);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }
        
        .input-formulario:hover {
            border-color: #bbb;
        }
        
        /* Checkbox */
        .recordarme-contenedor {
            display: flex;
            align-items: center;
            margin: 20px 0;
            padding: 8px 0;
        }
        
        .checkbox-custom {
            width: 18px;
            height: 18px;
            margin-right: 10px;
            cursor: pointer;
        }
        
        .checkbox-custom:checked {
            accent-color: var(--color-primario);
        }
        
        .recordarme-contenedor label {
            cursor: pointer;
            font-weight: normal;
            margin: 0;
            color: #666;
        }
        
        /* Botón */
        .boton-principal {
            width: 100%;
            padding: 14px;
            background-color: var(--color-primario);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .boton-principal:hover {
            background-color: var(--color-primario-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .boton-principal:active {
            transform: translateY(0);
        }
        
        /* Responsive */
        @media (max-width: 480px) {
            header {
                flex-direction: column;
                text-align: center;
                gap: 10px;
                padding: 15px;
            }
            
            .Escudo_institucion {
                height: 40px;
            }
            
            .titulo-institucion {
                font-size: 1.3rem;
            }
            
            .contenedor-alertas {
                padding: 0 15px;
                margin-top: 15px;
            }
            
            .card-formulario {
                padding: 25px 20px;
                margin: 0 15px;
            }
            
            .titulo-formulario {
                font-size: 1.3rem;
            }
        }
        
        @media (max-width: 350px) {
            .card-formulario {
                padding: 20px 15px;
            }
        }

        .titulo-login {
            color: #2c3e50;
            margin-bottom: 25px;
            text-align: center;
            font-size: 3.5rem;
            font-weight: 600;
        }

        .form-rol {
        display: flex;
        gap: 20px;
        justify-content: center;
        flex-wrap: wrap;
        padding: 20px;
        }
    
        .role-card {
            width: 280px;
            padding: 30px 20px;
            border: 2px solid #e0e0e0;
            border-radius: 12px;
            background: white;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
        }
        
        .role-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            border-color: #4a6cf7;
        }
        
        .role-card:active {
            transform: translateY(-2px);
        }
        
        .role-card:focus {
            outline: 3px solid rgba(74, 108, 247, 0.3);
            outline-offset: 2px;
        }
        
        .role-icon {
            font-size: 48px;
            margin-bottom: 10px;
        }
        
        .role-title {
            margin: 0;
            color: #333;
            font-size: 1.4rem;
        }
        
        .role-description {
            margin: 0;
            color: #666;
            font-size: 0.9rem;
            line-height: 1.4;
        }