/* =========================================================
   VARIABLES OFICIALES DE COLOR Y RESET
   ========================================================= */
:root {
    --ubv-dark: #0C1B47;       /* Azul Oscuro Principal */
    --ubv-darker: #060e25;     /* Azul Más Oscuro (Footer/Fondos) */
    --ubv-gold: #947223;       /* Dorado Principal */
    --ubv-cream: #F7E6A4;      /* Crema Suave */
    --ubv-secondary: #0A70B5;  /* Azul Claro/Botones */
    --white: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.relative-sec { position: relative; padding: 60px 0 80px 0; }

/* =========================================================
   1. NAVEGACIÓN (TRANSPARENTE)
   ========================================================= */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: transparent;
    padding: 20px 0;
}

.nav-container {
    max-width: 1300px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
}

.logo-area { display: flex; align-items: center; gap: 10px; }
.logo-img-placeholder {
    border: 2px solid var(--ubv-gold);
    border-radius: 50%; /* Simulando logo ovalado */
    padding: 15px 10px;
    background-color: var(--ubv-dark);
    color: var(--white);
    font-weight: bold;
    font-size: 14px;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
.logo-text { display: flex; flex-direction: column; }
.text-uni { color: var(--ubv-secondary); font-size: 10px; font-weight: 700; }
.text-brunca { color: var(--ubv-dark); font-size: 14px; font-weight: 700; -webkit-text-stroke: 0.5px white; } /* Contorno blanco para verse en fondo oscuro */

.nav-links { display: flex; list-style: none; gap: 25px; }
.nav-links li a {
    color: var(--ubv-cream);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.8); /* Vital para legibilidad */
    transition: color 0.3s;
}
.nav-links li a:hover { color: var(--ubv-gold); }

/* =========================================================
   2. HERO (FONDO PANTALLA)
   ========================================================= */
.hero {
    height: 100vh;
    background: url('../images/banner_universidad.png') center/cover no-repeat;
    display: flex;
    align-items: center;
    position: relative;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.2); /* Oscurecer un poco */
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1300px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    padding: 0 30px;
}

.hero-left { width: 50%; }

/* Bloques de la derecha */
.hero-right {
    width: 300px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 50px;
}

.floating-box {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.box-header {
    padding: 8px;
    text-align: center;
    font-weight: 700;
    font-size: 14px;
}
.header-light { background-color: var(--ubv-cream); color: var(--ubv-dark); }
.header-dark { background-color: var(--ubv-gold); color: var(--white); }

.box-content {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}
.white-bg { background-color: rgba(255,255,255,0.9); }
.map-placeholder { 
    background-color: #cbd5e1; 
    color: var(--ubv-secondary); 
    font-size: 12px;
    font-weight: 600;
}

/* Estilos para el mapa de Google */
.map-box {
    height: 150px;
    display: block; 
}

.map-box iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

.map-placeholder i { font-size: 30px; margin-bottom: 5px; }

/* Caja de Horarios */
.schedule-box {
    background-color: var(--ubv-darker);
    color: var(--white);
    padding: 15px;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.schedule-box ul {
    list-style: none;
    font-size: 13px;
    width: 100%;
}
.schedule-box ul li {
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 5px;
}
.schedule-box ul li span {
    color: var(--ubv-cream);
}

/* =========================================================
   3. OFERTA ACADÉMICA (INDEX)
   ========================================================= */
.section-oferta { background-color: #f8fafc; }

/* =========================================================
   PÁGINA PLANES DE ESTUDIO (PLANES.HTML)
   ========================================================= */
.planes-header {
    background: var(--ubv-dark);
    padding: 120px 0 60px 0; /* Padding superior para evitar solapamiento con nav fijo */
    text-align: center;
    color: var(--white);
}

.planes-header h1 {
    color: var(--ubv-gold);
    font-size: 36px;
    margin-bottom: 10px;
}

.planes-container {
    max-width: 1000px;
    margin: -40px auto 80px auto;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    position: relative;
    z-index: 10;
    overflow: hidden;
}

.tabs-header {
    display: flex;
    background: #f1f5f9;
    border-bottom: 2px solid #e2e8f0;
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: 20px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-weight: 700;
    font-size: 14px;
    color: #64748b;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--ubv-secondary);
    background: #e2e8f0;
}

.tab-btn.active {
    color: var(--ubv-dark);
    border-bottom-color: var(--ubv-gold);
    background: var(--white);
}

.tab-content {
    display: none;
    padding: 40px;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

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

.plan-info-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 20px;
}

.plan-info-header h3 {
    color: var(--ubv-dark);
    font-size: 24px;
}

.btn-descargar-pdf {
    background-color: transparent;
    color: #dc2626;
    border: 1px solid #fca5a5;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}
.btn-descargar-pdf:hover {
    background-color: #fef2f2;
    border-color: #dc2626;
}

/* Tabla bonita para el plan */
.tabla-plan {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 10px rgba(0,0,0,0.02);
}
.tabla-plan th, .tabla-plan td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid #f1f5f9;
}
.tabla-plan th {
    background-color: var(--ubv-dark);
    color: var(--white);
    font-size: 13px;
    text-transform: uppercase;
}
.tabla-plan td {
    font-size: 13px;
    color: #475569;
}
.tabla-plan tbody tr:hover {
    background-color: #f8fafc;
}
.cuatrimestre-title {
    background-color: var(--ubv-cream) !important;
    color: var(--ubv-dark) !important;
    font-weight: bold;
    text-align: center !important;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* =========================================================
   4. MATRÍCULA (AZUL OSCURO)
   ========================================================= */
.section-matricula { background-color: var(--ubv-dark); color: var(--white); }

.title-gold { color: var(--ubv-gold); font-size: 28px; font-weight: 700; margin-bottom: 5px; }
.subtitle-light { color: var(--ubv-cream); font-size: 14px; margin-bottom: 40px; }

.steps-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 40px;
}

.step { display: flex; flex-direction: column; align-items: center; gap: 10px; width: 120px; }
.step-icon { font-size: 40px; color: var(--ubv-cream); }
.step span { font-size: 12px; font-weight: 600; color: var(--white); }
.step-arrow { color: var(--ubv-gold); font-size: 20px; margin-top: -20px; }

.btn-blue {
    background-color: var(--ubv-secondary);
    color: var(--white);
    border: none;
    padding: 12px 30px;
    border-radius: 25px; /* Bordes redondeados como en la imagen */
    font-weight: 700;
    cursor: pointer;
    margin-bottom: 15px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}
.link-guia { display: block; color: var(--ubv-cream); text-decoration: underline; font-size: 12px; }

/* =========================================================
   4. ESPACIO U (BANNER)
   ========================================================= */
.section-espaciou {
    background-color: var(--ubv-darker);
    border-top: 5px solid var(--ubv-gold);
    border-bottom: 5px solid var(--ubv-gold);
    padding: 30px 0;
}

.flex-banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.banner-text h3 { color: var(--ubv-gold); font-size: 22px; }
.banner-text p { color: var(--white); font-size: 14px; }

.btn-blue-outline {
    background-color: var(--ubv-darker);
    border: 2px solid var(--ubv-secondary);
    color: var(--white);
    padding: 10px 25px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 0 10px var(--ubv-secondary); /* Resplandor azul */
}
.btn-subtext { display: block; font-size: 9px; font-weight: 400; color: #aaa; margin-top: 3px; }

/* =========================================================
   5. HISTORIA Y MISIÓN (FONDO CREMA)
   ========================================================= */
.section-historia { background-color: var(--ubv-cream); }

.title-dark-gold { color: var(--ubv-gold); font-size: 28px; margin-bottom: 5px; }
.subtitle-dark { color: var(--ubv-dark); font-size: 14px; margin-bottom: 40px; font-weight: 600;}

.cards-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.info-card {
    background: var(--white);
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.info-card h4 {
    color: var(--ubv-dark);
    font-size: 14px;
    margin-bottom: 15px;
    text-align: center;
}

.card-img-box {
    width: 100%;
    height: 120px;
    background-color: #f1f5f9;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lista-mision { list-style: none; text-align: left; font-size: 12px; color: #444; }
.lista-mision li { margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.lista-mision i { color: var(--ubv-gold); font-size: 16px; }

.relative { position: relative; }
.icon-play { position: absolute; font-size: 40px; color: red; } /* Simula botón de YouTube */

/* =========================================================
   6. CONTÁCTANOS
   ========================================================= */
.section-contacto { background-color: #fdfdfd; }
.title-dark { color: var(--ubv-dark); font-size: 28px; margin-bottom: 5px; }

.contacto-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    margin-top: 40px;
    align-items: start;
}

.mapa-contacto {
    background-color: #e2e8f0;
    height: 150px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contacto-info h4 { color: var(--ubv-dark); font-size: 18px; margin-bottom: 10px; }
.contacto-info p { font-size: 14px; color: #555; margin-bottom: 8px; }
.contacto-info i { color: var(--ubv-gold); width: 20px; }

.social-icons { margin-top: 15px; display: flex; gap: 15px; }
.social-icons i { color: var(--ubv-gold); font-size: 24px; cursor: pointer; }

/* Formulario Fondo Azul */
.form-container {
    background-color: var(--ubv-dark);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.form-container form { display: flex; flex-direction: column; gap: 15px; }
.form-container input, .form-container textarea {
    padding: 12px;
    border: 1px solid #fff;
    border-radius: 4px;
    font-size: 13px;
    outline: none;
}
.btn-submit { margin-top: 10px; align-self: flex-start; border-radius: 4px; padding: 12px 20px; }

/* =========================================================
   PESTAÑA VOLVER ARRIBA (DISEÑO EXACTO)
   ========================================================= */
.tab-volver {
    position: absolute;
    bottom: 0;
    right: 5%;
    background-color: var(--ubv-gold);
    color: var(--white);
    padding: 6px 20px;
    font-size: 11px;
    font-weight: 700;
    text-decoration: none;
    border-radius: 8px 8px 0 0;
    box-shadow: 0 -2px 5px rgba(0,0,0,0.1);
}

/* =========================================================
   FOOTER
   ========================================================= */
.footer {
    background-color: var(--ubv-darker);
    padding: 40px 0 20px 0;
}
.footer-content { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 20px; margin-bottom: 20px;}
.footer-logo { color: var(--white); font-weight: bold; font-size: 14px; display: flex; align-items: center; gap: 10px;}
.footer-links a { color: #a0aec0; text-decoration: none; font-size: 12px; margin-left: 20px; transition: color 0.3s; }
.footer-links a:hover { color: var(--ubv-gold); }
.footer-copy { text-align: center; color: #718096; font-size: 11px; }

/* =========================================================
   7. DISEÑO RESPONSIVO (MÓVIL)
   ========================================================= */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.02);
    margin-bottom: 20px;
}
.table-responsive .tabla-plan {
    margin-bottom: 0;
    box-shadow: none;
    border-radius: 0;
    min-width: 600px; /* Asegura que la tabla no se aplaste demasiado en móvil */
}

@media (max-width: 768px) {
    /* Navbar */
    .nav-container { flex-direction: column; gap: 15px; padding: 15px; }
    .nav-links { flex-wrap: wrap; justify-content: center; gap: 15px; }
    
    /* Hero */
    .hero-content { flex-direction: column; align-items: center; text-align: center; }
    .hero-left { width: 100%; margin-bottom: 30px; }
    .hero-right { width: 100%; align-items: center; margin-top: 20px; }
    
    /* Planes de Estudio */
    .planes-container { margin-top: -20px; margin-bottom: 40px; }
    .tab-btn { padding: 15px 10px; font-size: 12px; }
    .tab-content { padding: 20px 15px; }
    .plan-info-header { flex-direction: column; gap: 15px; text-align: center; }
    .plan-info-header h3 { font-size: 20px; }
    
    /* Grid sections */
    .cards-3 { grid-template-columns: 1fr; }
    .contacto-grid { grid-template-columns: 1fr; gap: 30px; }
    .steps-row { flex-direction: column; gap: 40px; }
    .step-arrow { transform: rotate(90deg); margin-top: 0; }
    
    /* Banner U */
    .flex-banner { flex-direction: column; gap: 20px; text-align: center; }
    
    /* Footer */
    .footer-content { flex-direction: column; gap: 20px; text-align: center; }
    .footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
    .footer-links a { margin-left: 0; }
}