:root {
    --color-matematicas: #2c7be5;
    --color-castellano: #e63946;
    --color-ingles: #06d6a0;
    --color-sociales: #ff9f1c;
    --color-biologia: #38b000;
    --color-bienvenida: #f6bd60;
    --color-mascositas: #9d4edd;
}

#matematicas { border-top: 5px solid var(--color-matematicas); }


/* ==== BANNER UNIDADES ==== */
#bannerUD {
    height: 300px;
    background-image: url("../images/bannerUD2.png"); /* tu imagen de fondo */
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

#bannerUD .banner-overlay {
    background: rgba(0, 0, 0, 0.55); /* capa oscura encima */
    color: #fff;
    text-align: center;
    padding: 20px 40px;
    border-radius: 10px;
}

#bannerUD h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

#bannerUD p {
    font-size: 1.2em;
}
    
/* Título principal */
.modules-title {
    text-align: center;
    font-size: 2.5em;
    margin: 30px 0;
    color: #222;
}

/* Grid */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    padding: 20px;
    max-width: 1200px;
    margin: auto;
}

/* Cards */
.module-card {
    background: white;
    padding: 40px 20px;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.module-card i {
    font-size: 3em;
    margin-bottom: 15px;
    color: #cc2222; /* color principal */
}

.module-card h2 {
    font-size: 1.5em;
    color: #333;
}

/* Hover effect */
.module-card:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 10px 25px rgba(0,0,0,0.25);
}

/* Colores específicos */
#matematicas { border-top: 5px solid #2c7be5; }
#castellano { border-top: 5px solid #e63946; }
#ingles { border-top: 5px solid #06d6a0; }
#sociales { border-top: 5px solid #ff9f1c; }
#biologia { border-top: 5px solid #38b000; }
#bienvenida { border-top: 5px solid #f6bd60; }
#mascositas { border-top: 5px solid #9d4edd; }


/* ===== MODAL ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.6);
}

.modal-content {
    background: #fff;
    margin: 10% auto;
    padding: 30px;
    border-radius: 10px;
    max-width: 600px;
    text-align: center;
    animation: fadeIn 0.4s;
    position: relative;
    border-top: 6px solid transparent; /* se cambiará dinámicamente */
}

/* Cerrar modal */
.close-modal {
    position: absolute;
    right: 25px;
    top: 15px;
    font-size: 1.8em;
    cursor: pointer;
    color: #333;
    z-index: 2100;
    transition: transform 0.4s ease, color 0.3s ease;
}
.close-modal:hover {
    transform: rotate(360deg);
    color: #cc2222;
}

/* Botón */
.modal-btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 25px;
    background: #cc2222;
    color: #fff;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
}
.modal-btn:hover {
    background: #182848;
}

/* Colores dinámicos para el modal */
.modal-content.matematicas { border-top-color: #2c7be5; }
.modal-content.castellano { border-top-color: #e63946; }
.modal-content.ingles { border-top-color: #06d6a0; }
.modal-content.sociales { border-top-color: #ff9f1c; }
.modal-content.biologia { border-top-color: #38b000; }
.modal-content.bienvenida { border-top-color: #f6bd60; }
.modal-content.mascositas { border-top-color: #9d4edd; }


/* Animación */
@keyframes fadeIn {
    from {opacity: 0; transform: scale(0.9);}
    to {opacity: 1; transform: scale(1);}
}


/* Responsive */
@media (max-width: 768px) {
    #bannerUD h1, #hero h1 {
        font-size: 2em;
    }
    .module-card {
        padding: 20px 15px;
    }
}