:root {
        --color-primary: #007bff;
        --color-primary-dark: #0056b3;
        --color-secondary: #6c757d;
        --color-light: #f8f9fa;
        --color-dark: #212529;
        --color-border: #dee2e6;
        --color-header: #2c3e50;
        --color-section: #f1f5f9;
        --border-radius: 8px;
        --box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

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

    body {
        font-family: 'Poppins', sans-serif;
        background-color: #ffffff;
        color: var(--color-dark);
        line-height: 1.6;
        padding: 0;
        margin: 0;
    }

    .email-header {
        background-color: #ffffff;
        box-shadow: var(--box-shadow);
        margin-bottom: 20px;
    }

    .header-logos {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 20px;
        padding: 15px 0;
    }
    .header-logos img {
        height: 80px;
        max-width: 180px;
        object-fit: contain;
    }
    .header-info {
        flex: 1;
        min-width: 250px;
        text-align: center;
        padding: 10px;
    }
    .header-title {
        font-size: 18px;
        font-weight: bold;
        color: #2c3e50;
        margin-bottom: 5px;
    }
    .header-subtitle {
        font-size: 14px;
        color: #555;
        margin-bottom: 3px;
    }
    @media (max-width: 600px) {
        .header-logos {
            flex-direction: column;
            text-align: center;
        }
        .header-logos img {
            height: 70px;
            margin-bottom: 10px;
        }
        .header-info {
            order: 3;
            width: 100%;
        }
    }

    .formulario-container {
        max-width: 900px;
        margin: 0 auto 40px;
        background-color: #ffffff;
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow);
        overflow: hidden;
    }

    .titulo {
        color: var(--color-header);
        padding: 20px;
        text-align: center;
        margin-bottom: 20px;
    }

    .form-title {
        background-color: var(--color-header);
        color: white;
        padding: 20px;
        text-align: center;
        margin-bottom: 20px;
    }

    form {
        padding: 0 20px 20px;
    }

    .seccion {
        background-color: var(--color-section);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius);
        padding: 15px;
        margin-bottom: 25px;
        position: relative;
    }

    .seccion::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 5px;
        height: 100%;
        background-color: var(--color-primary);
        border-radius: var(--border-radius) 0 0 var(--border-radius);
    }

    .seccion-header {
        background-color: var(--color-header);
        color: white;
        padding: 12px 15px;
        font-weight: 600;
        margin: -15px -15px 15px -15px;
        border-radius: var(--border-radius) var(--border-radius) 0 0;
    }

    .campo {
        margin-bottom: 20px;
    }

    .campo label {
        display: block;
        margin-bottom: 8px;
        font-weight: 500;
        color: var(--color-dark);
    }

    .campo input, 
    .campo select, 
    .campo textarea {
        width: 100%;
        padding: 10px 12px;
        border: 1px solid var(--color-border);
        border-radius: 4px;
        background-color: white;
        font-family: 'Poppins', sans-serif;
        transition: border-color 0.3s, box-shadow 0.3s;
    }

    .campo input:focus, 
    .campo select:focus, 
    .campo textarea:focus {
        border-color: var(--color-primary);
        box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
        outline: none;
    }

    .campo textarea {
        min-height: 120px;
        resize: vertical;
    }

    .btn-registrar {
        background-color: var(--color-primary);
        color: white;
        padding: 12px 30px;
        border: none;
        border-radius: 4px;
        cursor: pointer;
        font-weight: 600;
        font-size: 16px;
        transition: background-color 0.3s;
        display: block;
        margin: 30px auto 10px;
        width: 100%;
        max-width: 300px;
    }

    .btn-registrar:hover {
        background-color: var(--color-primary-dark);
    }

    /* Estilos para dispositivos móviles */
    @media (max-width: 768px) {
        .header-container {
            flex-direction: column;
            padding: 15px;
        }

        .logo {
            margin-bottom: 15px;
            height: 60px;
        }

        .formulario-container {
            margin: 0 15px 30px;
            border-radius: 0;
        }

        form {
            padding: 0 15px 15px;
        }

        .seccion {
            padding: 12px;
        }

        .seccion-header {
            padding: 10px 12px;
        }
    }

    /* Estilos para campos opcionales */
    .campo-opcional label::after {
        content: " (Opcional)";
        font-size: 0.8em;
        color: var(--color-secondary);
        font-weight: normal;
    }

    /* Contador de caracteres para textarea */
    .contador-caracteres {
        font-size: 0.8em;
        color: var(--color-secondary);
        text-align: right;
        margin-top: 5px;
    }