/* ======== NUEVA PALETA DE COLORES Y ESTILOS GLOBALES ======== */
:root {
    --patagonia-darkblue: #003366;
    --patagonia-green: #62B428;
    --patagonia-white: #FFFFFF;
    --patagonia-lightgray: #F2F6F9;
    --patagonia-text-dark: #333333;
    --patagonia-green-darker: #529421; /* Tono más oscuro para hover */
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--patagonia-lightgray);
    color: var(--patagonia-text-dark);
}

.hidden {
    display: none !important;
}

/* ======== ESTILOS PARA EL NUEVO HEADER ======== */
.site-header {
    background-color: var(--patagonia-darkblue);
    color: var(--patagonia-white);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 0 1.5rem; /* px-6 */
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem; /* Ajusta la altura del header */
    max-width: 1280px;
    margin: 0 auto;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--patagonia-white);
}

.logo-img { /* Si usaras una imagen de logo */
    height: 2.5rem; /* Ajustado para que se vea bien */
    width: auto;
    margin-right: 0.75rem;
}

.desktop-menu {
    display: none; /* Oculto en móvil por defecto */
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 2rem; /* space-x-8 */
    font-size: 1.125rem; /* text-lg */
    font-weight: 500;
}

.desktop-menu li a.nav-link {
    color: var(--patagonia-white);
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
    padding-bottom: 4px;
}

.desktop-menu li a.nav-link:hover {
    color: var(--patagonia-green);
}

/* Subrayado animado */
.desktop-menu li a.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background-color: var(--patagonia-green);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease-out;
}

.desktop-menu li a.nav-link:hover::after,
.desktop-menu li a.nav-link.active-nav-link::after {
    transform: scaleX(1);
}

.desktop-menu li a.nav-link.active-nav-link {
    color: var(--patagonia-green);
}

.mobile-menu-button-container {
    display: block; /* Visible en móvil por defecto */
}

#mobile-menu-button {
    background: none;
    border: none;
    color: var(--patagonia-white);
    cursor: pointer;
    padding: 0.5rem;
}

#mobile-menu-button svg {
    width: 2rem;
    height: 2rem;
}

.mobile-menu-panel {
    background-color: var(--patagonia-darkblue);
    padding: 1rem 1.5rem 1.5rem; /* py-4 px-6 pb-4 */
}

.mobile-menu-panel ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem; /* space-y-3 */
}

.mobile-menu-panel li a.nav-link {
    display: block;
    padding: 0.5rem 0; /* py-2 */
    color: var(--patagonia-white);
    text-decoration: none;
    font-size: 1.125rem; /* text-lg */
    transition: color 0.3s ease;
}

.mobile-menu-panel li a.nav-link:hover,
.mobile-menu-panel li a.nav-link.active-nav-link {
    color: var(--patagonia-green);
}


/* ======== ESTILOS PRINCIPALES DE LA LECCIÓN (ADAPTADOS) ======== */
.container {
    background-color: var(--patagonia-white);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 900px;
    margin: 2rem auto; /* Agregado margen superior e inferior */
}

.lesson-title {
    text-align: center;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--patagonia-darkblue);
    padding-bottom: 15px;
}

.lesson-title h1 {
    color: var(--patagonia-darkblue);
    margin: 0;
    font-size: 2.25rem; /* text-4xl */
    font-weight: 800; /* font-extrabold */
}

/* --- ESTILOS PARA PESTAÑAS (ADAPTADOS) --- */
.tab-navigation {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 20px;
    border-bottom: 1px solid #dee2e6;
}

.tab-button {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-bottom: none;
    padding: 10px 15px;
    cursor: pointer;
    margin-right: 5px;
    margin-bottom: -1px; /* Para que el borde inferior se solape con el de .tab-navigation */
    border-radius: 5px 5px 0 0;
    font-size: 0.9em;
    color: var(--patagonia-darkblue); /* Color de texto cambiado */
    transition: background-color 0.3s ease, color 0.3s ease;
    font-weight: 500;
}

.tab-button:hover {
    background-color: #e9ecef;
}

.tab-button.active {
    background-color: var(--patagonia-darkblue); /* Color de pestaña activa */
    color: var(--patagonia-white);
    border-color: var(--patagonia-darkblue);
}

/* --- NAVEGACIÓN DE SECCIÓN (ADAPTADA) --- */
nav.section-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding: 10px;
    background-color: #e9ecef; /* Un gris claro para destacar los botones */
    border-radius: 5px;
}

nav.section-navigation button {
    background-color: var(--patagonia-darkblue);
    color: var(--patagonia-white);
    border: none;
    padding: 10px 18px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 0.9em;
    font-weight: 500;
}

nav.section-navigation button:hover:not(:disabled) {
    background-color: var(--patagonia-green); /* Hover verde */
}

nav.section-navigation button:disabled {
    background-color: #c0c0c0;
    cursor: not-allowed;
}

/* --- CONTENIDO DE LA SECCIÓN --- */
.content-section {
    display: none; /* Oculto por defecto, JS lo activa */
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 20px;
    background-color: #fdfdfd; /* Ligeramente diferente al fondo del container */
}

.content-section.active { display: block; }

.content-section h2 {
    color: var(--patagonia-darkblue);
    margin-top: 0;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    font-weight: 700;
}

.text-content, .example-content {
    min-height: 50px; /* Para evitar colapso cuando está vacío */
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 4px;
    border: 1px solid #eee;
    white-space: pre-wrap; /* Para respetar saltos de línea y espacios en el texto de JS */
    line-height: 1.8; /* Mejor legibilidad para texto con mates */
    overflow-wrap: break-word;
    font-family: 'Roboto', sans-serif; /* Mantenemos Roboto para el contenido matemático */
}

.example-content {
    border-left: 3px solid var(--patagonia-green);
}
.example-content:empty { display: none; padding: 0; margin: 0; border: none; }


.text-content span.cursor, .example-content span.cursor {
    display: inline-block;
    background-color: #333;
    width: 10px; /* Ancho del cursor */
    height: 1.2em; /* Altura relativa al texto */
    animation: blink 1s infinite;
    margin-left: 2px;
    vertical-align: text-bottom;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* --- BOTONES DE CONTROL Y EJERCICIOS (ADAPTADOS) --- */
.control-explanation-btn, #generateExerciseBtn, .submit-exercise-btn {
    color: var(--patagonia-white);
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-bottom: 10px; 
    margin-top: 5px;
    font-weight: 500;
}

.control-explanation-btn[data-type="main"] {
    background-color: var(--patagonia-darkblue);
}
.control-explanation-btn[data-type="main"]:hover:not(:disabled) {
    background-color: #002244; /* Azul más oscuro */
}

.control-explanation-btn[data-type="example"],
#generateExerciseBtn, .submit-exercise-btn {
    background-color: var(--patagonia-green);
}
.control-explanation-btn[data-type="example"]:hover:not(:disabled),
#generateExerciseBtn:hover, 
.submit-exercise-btn:hover {
    background-color: var(--patagonia-green-darker);
}

.control-explanation-btn:disabled {
    background-color: #c0c0c0;
    cursor: not-allowed;
}

/* --- CONTENEDORES DE EJERCICIOS --- */
#exerciseContainer {
    margin-top: 20px; padding: 15px; border: 1px solid #ced4da;
    border-radius: 5px; background-color: #f8f9fa;
}
#exerciseContainer p { margin-bottom: 10px; }
#exerciseContainer label { display: block; margin-bottom: 8px; cursor: pointer; }
#exerciseContainer label span { display: inline-block; vertical-align: middle; }
#exerciseContainer input[type="radio"] { margin-right: 8px; vertical-align: middle; }

#feedbackContainer { margin-top: 15px; padding: 15px; border-radius: 5px; overflow-wrap: break-word; }
#feedbackContainer.correct { background-color: #d4edda; border: 1px solid #c3e6cb; color: #155724; }
#feedbackContainer.incorrect { background-color: #f8d7da; border: 1px solid #f5c6cb; color: #721c24; }
#feedbackContainer.info { background-color: #d1ecf1; border: 1px solid #bee5eb; color: #0c5460; }


/* ======== ESTILOS PARA EL NUEVO FOOTER ======== */
.site-footer {
    background-color: var(--patagonia-darkblue);
    color: var(--patagonia-white);
    padding: 2rem 1.5rem;
    margin-top: 30px; /* Espacio antes del footer */
}
.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 1rem; /* Espacio entre elementos del footer */
}
.footer-copy p {
    margin: 0;
    font-size: 0.875rem; /* text-sm */
    text-align: center;
}
.footer-copy p small {
    display: block;
    margin-top: 0.5rem;
    opacity: 0.8;
}
.footer-socials {
    display: flex;
    gap: 1.5rem; /* space-x-6 */
}
.footer-socials a {
    color: var(--patagonia-green);
    transition: color 0.3s ease;
}
.footer-socials a:hover {
    color: var(--patagonia-white);
}
.footer-socials svg {
    width: 1.75rem; /* w-7 */
    height: 1.75rem; /* h-7 */
}

/* --- MEDIA QUERIES --- */
@media (min-width: 768px) { /* md breakpoint */
    .desktop-menu { display: flex; }
    .mobile-menu-button-container { display: none; }
    .mobile-menu-panel { display: none !important; } /* Siempre oculto en desktop */

    .footer-content {
        flex-direction: row;
    }
    .footer-copy p {
        text-align: left;
    }
}

@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 15px;
        margin: 1rem auto;
    }
    .lesson-title h1 {
        font-size: 1.8em;
    }
    .tab-navigation {
        justify-content: center; /* Centrar pestañas en móvil si hay pocas */
    }
    .tab-button {
        font-size: 0.8em;
        padding: 8px 10px;
        margin-bottom: 5px; /* Espacio si se envuelven */
    }
    nav.section-navigation {
        flex-direction: column;
    }
    nav.section-navigation button {
        margin-bottom: 10px;
        width: 100%;
    }
    nav.section-navigation button:last-child {
        margin-bottom: 0;
    }
    .control-explanation-btn {
        width: 100%; /* Botones de explicación/ejemplo a ancho completo */
    }
}