/* =========================================
   1. VARIABLES GLOBALES (Identidad UAEMex)
   ========================================= */
:root {
    --uaem-verde: #1B5E20;       /* Verde Institucional Oscuro */
    --uaem-verde-claro: #2e7d32; /* Verde para hovers */
    --uaem-dorado: #9E8B39;      /* Dorado Institucional */
    --uaem-dorado-brillo: #bfa846;
    --uaem-negro: #1a1a1a;
    --texto-gris: #555;
    --blanco: #ffffff;
    --fondo-gris: #f4f6f8;       /* Gris muy suave para fondos */
    --sombra-suave: 0 4px 6px rgba(0,0,0,0.1);
    --sombra-fuerte: 0 10px 30px rgba(0,0,0,0.2);
}

/* --- BARRA DE SCROLL PERSONALIZADA (Webkit) --- */
::-webkit-scrollbar {
    width: 10px; 
}
::-webkit-scrollbar-track {
    background: #e0e0e0; 
}
::-webkit-scrollbar-thumb {
    background: var(--uaem-verde); 
    border-radius: 5px; 
    border: 2px solid #e0e0e0; 
}
::-webkit-scrollbar-thumb:hover {
    background: var(--uaem-dorado); 
}

/* =========================================
   2. RESET Y ESTILOS BASE
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}
html { scroll-behavior: smooth; }

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--fondo-gris);
    color: var(--uaem-negro);
    overflow-x: hidden;
    /* SEGURIDAD: Evita selección de texto */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* =========================================
   3. HEADER Y NAVEGACIÓN
   ========================================= */
header {
    background-color: var(--uaem-verde);
    color: var(--blanco);
    padding: 0.8rem 2rem;
    border-bottom: 4px solid var(--uaem-dorado);
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1001;
}

.uaem-logo {
    height: 55px;
    width: auto;
    filter: drop-shadow(0 2px 2px rgba(0,0,0,0.3));
}

.logo-area h1 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 1px;
    line-height: 1.1;
    text-transform: uppercase;
    margin-left: 5px;
}

.logo-secundario {
    height: 45px;
    width: auto;
    filter: drop-shadow(0 1px 1px rgba(0,0,0,0.2));
}

.logo-dark-fix {
    filter: invert(1) brightness(1.5);
    filter: drop-shadow(0 1px 2px rgba(255, 255, 255, 0.3));
}

.nav-links {
    display: flex;
    gap: 25px;
    transition: all 0.3s ease;
}

.nav-links a {
    color: var(--blanco);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--uaem-dorado);
    transition: width 0.3s;
}

.nav-links a:hover::after { width: 100%; }

.hamburger {
    display: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--blanco);
    z-index: 1002;
    padding: 5px;
}

/* =========================================
   4. SECCIÓN HERO (Bienvenida)
   ========================================= */
.hero {
    background: linear-gradient(rgba(27, 94, 32, 0.7), rgba(0, 0, 0, 0.7)), url('recursos/imagenarriba.jpeg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--blanco);
    padding: 4rem 2rem;
    text-align: center;
    min-height: 550px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--uaem-dorado);
}

.hero-layout {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1200px;
    gap: 2rem;
}

.hero-content {
    flex: 1;
    text-align: left; 
    max-width: 600px;
    z-index: 2;
}

.hero-content h2 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.9);
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.9);
}

.hero-mascot {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
}

.hero-mascot img {
    width: 100%;
    max-width: 350px;
    height: auto;
    filter: drop-shadow(0 10px 15px rgba(0,0,0,0.5));
    animation: flotar 3s ease-in-out infinite;
}

@keyframes flotar {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

.boton-principal {
    background-color: var(--uaem-dorado);
    color: var(--blanco);
    border: none;
    padding: 14px 40px;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--sombra-suave);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    animation: pulse-gold 2s infinite;
}

.boton-principal:hover {
    background-color: var(--uaem-dorado-brillo);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(158, 139, 57, 0.4);
}

/* =========================================
   5. FEATURES (Tarjetas Informativas)
   ========================================= */
.features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 4rem 2rem;
    background: linear-gradient(to bottom, #ffffff 0%, #f4f6f8 100%);
    flex-wrap: wrap;
    margin-top: -50px;
    position: relative;
    z-index: 5;
}

.card {
    background: var(--blanco);
    padding: 2.5rem 2rem;
    border-radius: 15px;
    width: 320px;
    text-align: center;
    box-shadow: var(--sombra-suave);
    border-bottom: 4px solid var(--uaem-verde);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--sombra-fuerte);
}

.card .icono {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    display: block;
}

.card h3 {
    color: var(--uaem-verde);
    margin-bottom: 0.8rem;
    font-size: 1.4rem;
}

.card:hover h3, 
.card:hover p, 
.card:hover .icono {
    color: var(--blanco);
    text-shadow: 0 2px 4px rgba(0,0,0,0.8);
    transition: all 0.3s ease;
}

#card-salon:hover { background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('recursos/salon.jpg'); background-size: cover; background-position: center; }
#card-labs:hover { background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('recursos/laboratorio.jpg'); background-size: cover; background-position: center; }
#card-servicios:hover { background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('recursos/cafeteria.jpg'); background-size: cover; background-position: center; }

/* =========================================
   6. SECCIÓN IDENTIDAD (MISIÓN/VISIÓN)
   ========================================= */
.seccion-identidad {
    padding: 5rem 2rem;
    background-color: var(--fondo-gris);
    position: relative;
    overflow: hidden;
    margin-top: 2rem;
}

.seccion-identidad::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 300px;
    height: 300px;
    background: radial-gradient(var(--uaem-dorado) 10%, transparent 10%);
    background-size: 30px 30px;
    opacity: 0.1;
    z-index: 0;
}

.identidad-container {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.identidad-header {
    text-align: center;
    margin-bottom: 3rem;
}

.identidad-header h2 {
    font-size: 2.5rem;
    color: var(--uaem-verde);
    margin-bottom: 0.5rem;
}

.tabs-control {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: -25px;
    position: relative;
    z-index: 2;
}

.tab-btn {
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    background: #e0e0e0;
    color: #666;
    transition: all 0.4s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 10px;
}

.tab-btn.active {
    background: var(--uaem-verde);
    color: var(--blanco);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(27, 94, 32, 0.4);
}

.display-board {
    background: var(--blanco);
    padding: 4rem 3rem 3rem 3rem;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    border-top: 5px solid var(--uaem-dorado);
    min-height: 300px;
    position: relative;
    overflow: hidden;
}

.content-block {
    display: none;
    animation: fadeInSlide 0.6s ease-out;
    position: relative;
    z-index: 1; 
}

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

@keyframes fadeInSlide {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.texto-destacado h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--uaem-negro);
}

.highlight {
    color: var(--uaem-verde);
    border-bottom: 3px solid var(--uaem-dorado);
}

.texto-destacado p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
    margin-bottom: 1rem;
    text-align: justify;
}

.icono-fondo {
    position: absolute;
    bottom: -20px;
    right: 20px;
    font-size: 10rem;
    color: rgba(0,0,0,0.03);
    transform: rotate(-15deg);
    pointer-events: none;
}

.deco-esquina {
    position: absolute;
    top: 0;
    width: 50px;
    max-width: 25%;
    height: auto;
    z-index: 0;
    pointer-events: none;
    opacity: 0.95;
}

.esquina-izq { left: 0; border-top-left-radius: 20px; }
.esquina-der { right: 0; border-top-right-radius: 20px; }

/* =========================================
   7. SECCIÓN CARRERAS (Actualizado)
   ========================================= */
.seccion-carreras {
    padding: 5rem 2rem;
    background-color: #f1f8e9; 
    background-image: radial-gradient(#1B5E20 0.5px, transparent 0.5px);
    background-size: 20px 20px;
    opacity: 1;
}

.contenedor-titulo {
    text-align: center;
    margin-bottom: 3.5rem;
}

.contenedor-titulo h2 {
    color: var(--uaem-verde);
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.grid-carreras {
    display: flex;
    flex-wrap: wrap;
    justify-content: center; /* Centrado perfecto */
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.carrera-link {
    flex: 0 1 250px;
    min-width: 240px;
    text-decoration: none;
    color: inherit;
    display: block;
}

.carrera-card {
    background-color: var(--fondo-gris);
    border: 1px solid #ddd;
    border-top: 5px solid var(--uaem-dorado);
    border-radius: 12px;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    position: relative;
    overflow: hidden;
    height: 100%;
}

/* EFECTO HOVER: GREEN GLOW */
.carrera-card:hover {
    background-color: var(--uaem-verde);
    transform: translateY(-8px);
    box-shadow: 0 0 25px rgba(27, 94, 32, 0.6), 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: #2e7d32;
    border-top-color: var(--uaem-dorado-brillo);
}

.carrera-card i {
    font-size: 2.8rem;
    color: var(--uaem-verde);
    transition: color 0.3s;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.carrera-card span {
    font-weight: 700;
    color: var(--uaem-negro);
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.carrera-card:hover i, 
.carrera-card:hover span {
    color: var(--blanco);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.carrera-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.6s;
}

.carrera-card:hover::before { left: 100%; }

/* =========================================
   8. SECCIÓN MAPA
   ========================================= */
.seccion-mapa {
    padding: 6rem 2rem;
    background: linear-gradient(135deg, #fff8e1 0%, #ffecb3 100%);
    border-top: 1px solid rgba(158, 139, 57, 0.2);
}

.mapa-contenedor-hub {
    background: var(--blanco);
    border-radius: 20px;
    padding: 3rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
}

.hub-header h2 {
    color: var(--uaem-verde);
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.hub-header p {
    color: #666;
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
}

.grid-opciones {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    perspective: 1000px;
}

.opcion-card {
    flex: 1;
    min-width: 280px;
    max-width: 400px;
    background: var(--fondo-gris);
    padding: 2rem;
    border-radius: 15px;
    text-decoration: none;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transform-style: preserve-3d;
    will-change: transform;
}

.opcion-card.aparecer { opacity: 1; transform: translateY(0); }

.opcion-card:hover {
    transform: translateY(-5px);
    background: #fff;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.pixel-style:hover { border-color: #e91e63; }
.pixel-style .icono-grande { background: #fce4ec; color: #e91e63; }

.vr-style:hover { border-color: #00bcd4; }
.vr-style .icono-grande { background: #e0f7fa; color: #00bcd4; }

.icono-grande {
    font-size: 3rem;
    margin-bottom: 1rem;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: transform 0.3s;
}

.opcion-card:hover .icono-grande { transform: scale(1.1) rotate(5deg); }

.opcion-card h3 { color: var(--uaem-negro); font-size: 1.4rem; margin-bottom: 10px; }
.opcion-card p { color: #555; font-size: 0.95rem; margin-bottom: 20px; line-height: 1.5; }

.opcion-card .icono-grande, 
.opcion-card h3, 
.opcion-card p, 
.opcion-card .btn-ver {
    transform: translateZ(20px); transition: transform 0.3s;
}

.efecto-brillo {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.4), transparent 60%);
    opacity: 0;
    pointer-events: none;
    mix-blend-mode: overlay;
    transition: opacity 0.3s;
    border-radius: 15px;
    z-index: 10;
}

.btn-ver {
    margin-top: auto;
    background: var(--uaem-verde);
    color: var(--blanco);
    padding: 10px 25px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9rem;
    transition: background 0.3s;
}

.opcion-card:hover .btn-ver { background: var(--uaem-dorado); }

/* =========================================
   9. FOOTER (PROFESIONAL)
   ========================================= */
footer {
    background-color: var(--uaem-negro);
    color: #bdbdbd; /* Gris claro para texto */
    padding: 4rem 2rem 1rem 2rem;
    border-top: 5px solid var(--uaem-dorado);
    margin-top: auto;
    font-size: 0.95rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section {
    flex: 1;
    min-width: 250px;
}

.footer-section h3 {
    color: var(--blanco);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.footer-section h4 {
    color: var(--uaem-dorado); /* Títulos en dorado */
    font-size: 1.1rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

/* Pequeña línea debajo de los títulos */
.footer-section h4::after {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--uaem-verde);
    margin-top: 5px;
}

.footer-section p {
    line-height: 1.6;
    margin-bottom: 10px;
}

.footer-section a {
    display: block;
    color: #bdbdbd;
    text-decoration: none;
    margin-bottom: 10px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-section a:hover {
    color: var(--uaem-dorado);
    transform: translateX(5px); /* Efecto de movimiento a la derecha */
}

.footer-section i {
    color: var(--uaem-verde);
}

/* Barra inferior de copyright */
.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #333;
}

.footer-bottom span {
    color: var(--uaem-dorado);
    font-weight: bold;
}

/* Ajuste Móvil para el Footer */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }
    .footer-section {
        text-align: center; /* Centrar todo en móvil */
    }
    .footer-section h4::after {
        margin: 5px auto 0 auto; /* Centrar la línea decorativa */
    }
    .footer-section a {
        justify-content: center; /* Centrar los enlaces */
    }
}

footer span { color: var(--uaem-dorado); font-weight: bold; }

/* =========================================
   10. CHATBOT INTERACTIVO (POTROBOT)
   ========================================= */
.chatbot-container {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
    font-family: 'Segoe UI', sans-serif;
}

.chat-toggle-btn {
    width: 60px;
    height: 60px;
    background: var(--uaem-verde);
    border-radius: 50%;
    border: none;
    color: white;
    font-size: 1.8rem;
    cursor: pointer;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    transition: transform 0.3s, background 0.3s;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-toggle-btn:hover {
    transform: scale(1.1);
    background: var(--uaem-dorado);
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: #ff4444;
    color: white;
    font-size: 0.8rem;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border: 2px solid white;
}

.chat-window {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 350px;
    height: 450px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform: scale(0);
    transform-origin: bottom right;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid #eee;
}

.chat-window.active { transform: scale(1); }

.chat-header {
    background: var(--uaem-verde);
    padding: 15px;
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 3px solid var(--uaem-dorado);
}

.chat-avatar img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid white;
    background: white;
    object-fit: cover;
}

.chat-info h4 { font-size: 1rem; margin-bottom: 2px; }
.status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: #00e676;
    border-radius: 50%;
    margin-right: 5px;
}

.close-chat {
    margin-left: auto;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Cuerpo del Chat (Interactivo) */
.chat-body {
    flex: 1;
    padding: 20px;
    background-color: #f5f5f5;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    scroll-behavior: smooth;
}

.message {
    max-width: 80%;
    padding: 10px 14px;
    border-radius: 15px;
    font-size: 0.9rem;
    line-height: 1.4;
    word-wrap: break-word;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
    animation: fadeIn 0.3s ease;
}

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

/* Mensajes del Bot (Izquierda) */
.bot-message {
    background: white;
    align-self: flex-start;
    border-bottom-left-radius: 2px;
    color: #333;
}

/* Mensajes del Usuario (Derecha) */
.user-message {
    background: #e8f5e9;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
    color: #1B5E20;
    border: 1px solid #c8e6c9;
}

.message a {
    color: var(--uaem-dorado);
    font-weight: bold;
    text-decoration: underline;
}

.chat-footer {
    padding: 10px;
    background: white;
    border-top: 1px solid #eee;
    display: flex;
    gap: 10px;
}

.chat-footer input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 20px;
    outline: none;
    background: #fafafa;
}

.chat-footer button {
    background: var(--uaem-verde);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s;
}

.chat-footer button:hover { background: var(--uaem-dorado); }

/* =========================================
   11. ANIMACIONES Y EXTRAS GLOBALES
   ========================================= */
#texto-maquina {
    border-right: 3px solid var(--uaem-dorado);
    white-space: normal;
    display: inline-block;
    min-height: 1.2em;
}

@keyframes pulse-gold {
    0% { box-shadow: 0 0 0 0 rgba(158, 139, 57, 0.7); }
    70% { box-shadow: 0 0 0 15px rgba(158, 139, 57, 0); }
    100% { box-shadow: 0 0 0 0 rgba(158, 139, 57, 0); }
}

/* =========================================
   12. RESPONSIVE DESIGN (Móvil Optimizado)
   ========================================= */
@media (max-width: 768px) {
    
    /* --- HEADER COMPACTO --- */
    header { padding: 0.8rem 1rem; }
    .logo-area h1 { font-size: 1rem; } /* Texto del logo más chico */
    .uaem-logo { height: 40px; } /* Logos ajustados */
    .logo-secundario { height: 35px; }
    
    .hamburger { display: block; font-size: 1.5rem; }

    /* Menú lateral */
    .nav-links {
        position: fixed;
        top: 65px; /* Ajuste altura header */
        right: -100%;
        width: 80%;
        height: calc(100vh - 65px);
        background-color: var(--uaem-verde);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 2rem;
        gap: 1.5rem;
        box-shadow: -5px 0 15px rgba(0,0,0,0.2);
    }
    .nav-links.active { right: 0; }
    .nav-links a { font-size: 1.1rem; width: 100%; text-align: center; padding: 12px 0; }

    /* --- HERO (BIENVENIDA) --- */
    .hero { min-height: auto; padding: 3rem 1rem; }
    .hero-layout { flex-direction: column-reverse; text-align: center; gap: 1.5rem; }
    
    .hero-content { padding-top: 0.5rem; }
    .hero-content h2 { font-size: 1.8rem; margin-bottom: 0.5rem; } /* Título más manejable */
    .hero-content p { font-size: 1rem; line-height: 1.4; }
    
    .hero-mascot img { max-width: 160px; margin-bottom: 0.5rem; }

    /* Botón Hero más chico */
    .boton-principal {
        padding: 10px 25px; /* Menos relleno */
        font-size: 0.95rem;
        width: auto;
    }

    /* --- FEATURES (TARJETAS RÁPIDAS) --- */
    .features { padding: 2rem 1rem; gap: 1rem; margin-top: 0; }
    .card {
        width: 100%; /* Ocupan ancho disponible */
        padding: 1.5rem 1rem; /* Menos aire interno */
        display: flex; /* Flex para poner icono y texto lado a lado si quieres */
        flex-direction: column; /* (Opcional) Mantenemos columna para legibilidad */
        align-items: center;
    }
    .card .icono { font-size: 2.5rem; margin-bottom: 0.5rem; }
    .card h3 { font-size: 1.2rem; }

    /* --- IDENTIDAD (TABS) --- */
    .seccion-identidad { padding: 3rem 1rem; }
    .identidad-header h2 { font-size: 1.8rem; }
    
    /* Botones de pestañas compactos */
    .tabs-control { gap: 10px; width: 100%; }
    .tab-btn {
        padding: 8px 15px; /* Botones más flacos */
        font-size: 0.9rem;
        flex: 1; /* Se reparten el espacio 50/50 */
        justify-content: center;
    }
    
    .display-board { padding: 2.5rem 1.5rem 1.5rem 1.5rem; }
    .deco-esquina { width: 50px; opacity: 0.5; }

    /* --- CARRERAS: ¡AQUÍ ESTÁ LA MAGIA! (2 COLUMNAS) --- */
    .seccion-carreras { padding: 3rem 1rem; }
    
    .grid-carreras {
        gap: 10px; /* Menos espacio entre cuadritos */
    }

    /* Forzamos 2 columnas en lugar de 1 lista eterna */
    .carrera-link {
        flex: 0 1 calc(50% - 5px); /* 50% del ancho menos la mitad del gap */
        min-width: 0; /* Ignora el min-width de escritorio */
    }

    .carrera-card {
        padding: 1.5rem 0.5rem; /* Tarjetas compactas */
        gap: 10px;
    }
    
    .carrera-card i { font-size: 2rem; } /* Icono más chico */
    .carrera-card span { font-size: 0.8rem; letter-spacing: 0; } /* Texto ajustado */

    /* --- MAPA --- */
    .seccion-mapa { padding: 3rem 1rem; }
    .mapa-contenedor-hub { padding: 2rem 1rem; }
    
    .opcion-card {
        min-width: 100%; /* Aquí sí apilamos porque necesitan espacio */
        padding: 1.5rem;
    }
    .icono-grande { width: 60px; height: 60px; font-size: 2rem; margin-bottom: 0.5rem; }
    .opcion-card h3 { font-size: 1.2rem; }
    
    .btn-ver {
        padding: 8px 20px;
        font-size: 0.85rem;
    }

    /* --- CHATBOT MÓVIL --- */
    .chatbot-container { bottom: 15px; right: 15px; }
    
    /* Botón flotante más chico */
    .chat-toggle-btn {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
    
    /* Ventana de chat ocupa casi todo el ancho */
    .chat-window {
        width: calc(100vw - 40px); /* Ancho pantalla menos margenes */
        right: 0; /* Alineado a la derecha relativa */
        bottom: 65px;
        height: 55vh; /* Altura controlada */
        border-radius: 15px;
    }
}

/* =========================================
   15. PRELOADER (PANTALLA DE CARGA)
   ========================================= */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--blanco);
    z-index: 10000; /* Por encima de TODO, incluso del chat */
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

/* Cuando JS diga que terminó, ocultamos esto */
#preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
    position: relative;
}

.loader-logo {
    width: 80px;
    margin-bottom: 20px;
    animation: palpito 1.5s infinite ease-in-out;
}

.loader-circle {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(27, 94, 32, 0.1); /* Verde suave */
    border-top: 4px solid var(--uaem-dorado); /* Dorado girando */
    border-radius: 50%;
    margin: 0 auto 15px auto;
    animation: girar 1s linear infinite;
}

.loader-content p {
    color: var(--uaem-verde);
    font-weight: bold;
    font-size: 0.9rem;
    letter-spacing: 1px;
    animation: parpadeo 1.5s infinite;
}

@keyframes girar {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes palpito {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes parpadeo {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}