/* ==========================================================================
   SISTEMA DE DISEÑO - USB CARTAGENA CEV
   ========================================================================== */

:root {
  /* Paleta de Colores Institucionales */
  --usb-orange: #EF7D00;
  --usb-orange-dark: #D96F00;
  --usb-orange-light: #FFF3E5;
  --usb-dark: #1F2933;
  --usb-dark-lighter: #323F4B;
  --usb-gray-text: #52606D;
  --usb-gray-light: #F5f7fa;
  --usb-white: #FFFFFF;
  
  /* Tipografía */
  --font-primary: 'Montserrat', sans-serif;
  --font-secondary: 'Open Sans', system-ui, -apple-system, sans-serif;
  
  /* Espaciados y Layout */
  --container-width: 1200px;
  --spacing-xs: 0.5rem;   /* 8px */
  --spacing-sm: 1rem;     /* 16px */
  --spacing-md: 1.5rem;   /* 24px */
  --spacing-lg: 2.5rem;   /* 40px */
  --spacing-xl: 4rem;     /* 64px */
  --spacing-xxl: 6rem;    /* 96px */
  
  /* Radios y Sombras (Modernización) */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 4px rgba(31, 41, 51, 0.05);
  --shadow-md: 0 8px 16px rgba(31, 41, 51, 0.08);
  --shadow-lg: 0 16px 32px rgba(31, 41, 51, 0.12);
  --shadow-hover: 0 20px 40px rgba(239, 125, 0, 0.15); /* Orange tinted shadow */
  
  /* Transiciones */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   RESET & FUNDAMENTOS
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 100px; /* Para el header sticky */
}

body {
  font-family: var(--font-secondary);
  color: var(--usb-dark);
  background-color: var(--usb-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

/* ==========================================================================
   TIPOGRAFÍA Y UTILIDADES
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.2;
  color: var(--usb-dark);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.text-center { text-align: center; }
.bg-light { background-color: var(--usb-gray-light); }
.white { color: var(--usb-white) !important; }
.light { color: rgba(255,255,255,0.85) !important; }

/* Grid genérico responsivo */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

/* ==========================================================================
   BOTONES
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-normal);
}

.btn--primary {
  background-color: var(--usb-orange);
  color: var(--usb-white);
  box-shadow: 0 4px 12px rgba(239, 125, 0, 0.3);
}

.btn--primary:hover, .btn--primary:focus-visible {
  background-color: var(--usb-orange-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(239, 125, 0, 0.4);
}

.btn--secondary {
  background-color: var(--usb-white);
  color: var(--usb-dark);
  border-color: var(--usb-white);
}

.btn--secondary:hover {
  background-color: var(--usb-gray-light);
  color: var(--usb-orange);
}

.btn--outline-primary {
  background-color: transparent;
  color: var(--usb-orange);
  border-color: var(--usb-orange);
}

.btn--outline-primary:hover {
  background-color: var(--usb-orange);
  color: var(--usb-white);
}

/* ==========================================================================
   HEADER Y NAVEGACIÓN
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  border-bottom: 3px solid var(--usb-orange);
  transition: padding var(--transition-fast), box-shadow var(--transition-fast);
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.brand__logo-img {
  width: auto;
  height: 55px; /* Ajustado para el menu */
  object-fit: contain;
}

.brand__title {
  font-size: 1.1rem;
  color: var(--usb-dark);
  margin-bottom: 2px;
}

.brand__subtitle {
  display: block;
  font-size: 0.75rem;
  color: var(--usb-gray-text);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Menú de Navegación */
.nav__list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav__link {
  font-family: var(--font-primary);
  font-weight: 600;
  color: var(--usb-dark-lighter);
  font-size: 0.95rem;
  position: relative;
  padding: 8px 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--usb-orange);
  transition: width var(--transition-normal);
}

.nav__link:hover { color: var(--usb-orange); }
.nav__link:hover::after, .nav__link.active::after { width: 100%; }
.nav__link.active { color: var(--usb-orange); }

.nav__link.btn-outline {
  border: 2px solid var(--usb-orange);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--usb-orange);
}
.nav__link.btn-outline::after { display: none; }
.nav__link.btn-outline:hover { background-color: var(--usb-orange); color: var(--usb-white); }

/* Submenú Dropdown */
.nav__item--dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background-color: var(--usb-white);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-sm);
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  padding: var(--spacing-xs) 0;
  z-index: 100;
  border-top: 3px solid var(--usb-orange);
  list-style: none;
}

.nav__item--dropdown:hover .dropdown-menu,
.nav__item--dropdown:focus-within .dropdown-menu,
.nav__item--dropdown.is-active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-menu__link {
  display: block;
  padding: 10px var(--spacing-md);
  color: var(--usb-dark-lighter);
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  text-align: center;
}

.dropdown-menu__link:hover {
  background-color: var(--usb-gray-light);
  color: var(--usb-orange);
}

/* Hamburguesa Módulo */
.menu-toggle {
  display: none; /* Oculto en desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 2000;
}

.menu-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--usb-dark);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

/* ==========================================================================
   SECCIONES GENERALES
   ========================================================================== */

.section {
  padding: var(--spacing-xxl) 0;
}

.section__header {
  margin-bottom: var(--spacing-xl);
}

.section__title {
  font-size: 2.5rem;
  color: var(--usb-dark);
  margin-bottom: var(--spacing-xs);
  position: relative;
  display: inline-block;
}

/* Decoración estilo universidad */
.section__title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--usb-orange);
  border-radius: 2px;
}
.text-left .section__title::after { left: 0; transform: none; }

.section__subtitle {
  font-size: 1.125rem;
  color: var(--usb-gray-text);
  margin-top: var(--spacing-sm);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  margin-top: 80px; /* Compensa header fixed */
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-image: url('Banner1.png'); /* Carga el banner original o cambialo por uno mejor */
  background-size: cover;
  background-position: center;
  background-attachment: fixed; /* Parallax effect if desired */
  z-index: -2;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  /* Gradiente profesional oscuro */
  background: linear-gradient(90deg, rgba(31,41,51,0.9) 0%, rgba(31,41,51,0.7) 50%, rgba(31,41,51,0.3) 100%);
  z-index: -1;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  color: var(--usb-white);
  padding: var(--spacing-md) 0;
}

.hero__badge {
  display: inline-block;
  background-color: rgba(239, 125, 0, 0.2);
  color: var(--usb-orange);
  border: 1px solid rgba(239, 125, 0, 0.4);
  padding: 6px 16px;
  border-radius: 20px;
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-md);
  backdrop-filter: blur(4px);
}

.hero__title {
  font-size: 3.5rem;
  color: var(--usb-white);
  margin-bottom: var(--spacing-md);
  letter-spacing: -1px;
}

.hero__description {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
}

.hero__actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* ==========================================================================
   BIENVENIDA (SPLIT LAYOUT)
   ========================================================================== */

.welcome__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.welcome .section__title::after { left: 0; transform: none; }

.section__paragraph {
  color: var(--usb-gray-text);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.welcome__image img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  width: 100%;
  height: auto;
  border-left: 8px solid var(--usb-orange);
}

/* ==========================================================================
   PLATAFORMAS (CARDS)
   ========================================================================== */

.cards-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.platform-card {
  background: var(--usb-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.platform-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(239, 125, 0, 0.3);
}

.platform-card__image {
  height: 180px;
  background-size: cover;
  background-position: center;
  position: relative;
  /* Estilo base, cada card sobreescribe su imagen */
}

/* Usando las imágenes originales referenciadas en el HTML */
.platform-card__image--1 { background-image: url('card1.jpg'); }
.platform-card__image--2 { background-image: url('card2.jpg'); }
.platform-card__image--3 { background-image: url('card3.jpg'); }
.platform-card__image--4 { background-image: url('card4.jpg'); }

.platform-card__image::before {
  content: '';
  position: absolute;
  inset: 0;
  /* Overlay sútil naranja al hacer hover para la imagen */
  background: linear-gradient(0deg, rgba(31,41,51,0.5) 0%, transparent 100%);
  transition: opacity var(--transition-normal);
}

.platform-card:hover .platform-card__image::before {
  background: linear-gradient(0deg, rgba(239, 125, 0, 0.4) 0%, transparent 100%);
}

.platform-card__content {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.platform-card__tag {
  font-size: 0.75rem;
  font-family: var(--font-primary);
  font-weight: 700;
  color: var(--usb-orange);
  text-transform: uppercase;
  margin-bottom: var(--spacing-xs);
  letter-spacing: 1px;
}

.platform-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.platform-card__desc {
  color: var(--usb-gray-text);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.platform-card .btn {
  width: 100%;
  padding: 10px;
  font-size: 0.9rem;
}

/* ==========================================================================
   EQUIPO CEV
   ========================================================================== */

.team-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  justify-content: center;
  max-width: 1000px;
  margin: 0 auto;
}

.team-card {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--usb-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal);
  border: 1px solid transparent;
}

.team-card:hover {
  transform: translateY(-5px);
  border-color: var(--usb-orange-light);
  box-shadow: var(--shadow-md);
}

.team-card__img-wrapper {
  width: 160px;
  height: 160px;
  margin: 0 auto var(--spacing-sm);
  border-radius: 50%;
  padding: 4px; /* Espacio para el borde */
  background: linear-gradient(135deg, var(--usb-orange) 0%, #ffcda5 100%);
}

.team-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--usb-white);
}

.team-card__name {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.team-card__role {
  color: var(--usb-orange);
  font-size: 0.9rem;
  font-weight: 600;
}

/* ==========================================================================
   CONTACTO
   ========================================================================== */

.contact {
  padding-bottom: 0; /* Footer abarca el fondo abajo */
}

.contact__wrapper {
  background-color: var(--usb-dark);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
  overflow: hidden;
  box-shadow: 0 24px 48px -12px rgba(31, 41, 51, 0.5);
  margin-bottom: -100px; /* Overlaps with footer */
  z-index: 10;
}

.contact__wrapper::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(239,125,0,0.2) 0%, transparent 70%);
  border-radius: 50%;
  transform: translate(30%, -30%);
}

.contact-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: var(--spacing-xl);
}

.contact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  color: var(--usb-white);
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--transition-normal);
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.08); border-color: rgba(239, 125, 0, 0.3);
}

.contact-item__icon {
  width: 60px;
  height: 60px;
  background: rgba(239, 125, 0, 0.15);
  color: var(--usb-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
  transition: transform var(--transition-normal);
}

.contact-item:hover .contact-item__icon {
  transform: scale(1.1);
  background: var(--usb-orange);
  color: var(--usb-white);
}

.contact-item__title {
  color: var(--usb-white);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.contact-item__link, .contact-item__address {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
  font-style: normal;
}
.contact-item__link:hover { color: var(--usb-orange); }

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
  background-color: #111822; /* Más oscuro que el dark normal */
  color: var(--usb-white);
  padding-top: calc(100px + var(--spacing-xl)); /* Espacio para la tarjeta de contacto */
  border-top: 4px solid var(--usb-orange);
}

.footer__container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

.footer__brand {
  max-width: 600px;
  display: flex;
  flex: 1; /* Permite que ocupe más espacio equitativamente */
  gap: var(--spacing-md);
}

.brand__logo-img--large {
  height: 80px;
  flex-shrink: 0;
}

.footer__title { font-size: 1.25rem; color: var(--usb-white); margin-bottom: 4px; }
.footer__subtitle { color: rgba(255, 255, 255, 0.8); font-size: 0.95rem; margin-bottom: 12px;}
.footer__cert { font-size: 0.8rem; color: rgba(255, 255, 255, 0.5); }

.footer__heading {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  color: var(--usb-white);
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  color: var(--usb-white);
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background-color: var(--usb-orange);
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(239, 125, 0, 0.4);
}

.footer__bottom {
  background-color: #0b0f15;
  padding: var(--spacing-sm) 0;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   RESPONSIVE (MEDIA QUERIES)
   ========================================================================== */

@media (max-width: 992px) {
  .hero__title { font-size: 2.8rem; }
  .welcome__inner { grid-template-columns: 1fr; }
  .welcome__image { order: -1; max-width: 600px; margin: 0 auto; }
}

@media (max-width: 768px) {
  /* Header Mobile */
  .header__inner { height: 70px; }
  .menu-toggle { display: block; }
  
  .nav {
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--usb-white);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
    z-index: -1; /* Detrás del header inner */
  }
  
  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .nav__list {
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
  }
  
  .nav__item { width: 100%; text-align: center; }
  .nav__link.btn-outline { display: block; }

  /* Dropdown Mobile */
  .dropdown-menu {
    position: static;
    transform: none !important;
    box-shadow: none;
    border-top: none;
    background-color: var(--usb-gray-light);
    display: none;
    margin-top: 10px;
    opacity: 1;
    visibility: visible;
  }
  .nav__item--dropdown.is-active .dropdown-menu {
    display: block;
  }
  
  /* Menu Toggle Interacciones */
  .menu-toggle.is-active .menu-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle.is-active .menu-toggle__bar:nth-child(2) { opacity: 0; }
  .menu-toggle.is-active .menu-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* Secciones Móbiles */
  .section { padding: var(--spacing-xl) 0; }
  .hero { min-height: auto; padding: calc(var(--spacing-xl) + 2rem) 0; }
  .hero__title { font-size: 2.2rem; }
  .hero__actions { flex-direction: column; }
  .btn { width: 100%; }
  
  .section__title { font-size: 2rem; }
  
  .footer__brand { flex-direction: column; text-align: center; }
  .footer__container { flex-direction: column; align-items: center; text-align: center; }
}

@media (max-width: 480px) {
  .brand__title { font-size: 0.9rem; }
  .brand__subtitle { font-size: 0.65rem; }
  .hero__title { font-size: 1.8rem; }
}