/* ESTILOS GLOBALES, ESTRUCTURA Y COMPONENTES COMUNES */

/* 1. RESET & ESTILOS BASE */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-secondary);
  font-size: var(--fs-md);
  line-height: var(--lh-relaxed);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  color: var(--text-primary);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
}

h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); margin-bottom: var(--spacing-md); }
h3 { font-size: var(--fs-xl); }

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

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  background: none;
  border: none;
  outline: none;
}

/* 2. BOTONES PREMIUM */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  font-weight: var(--fw-semibold);
  transition: all var(--transition-normal);
  cursor: pointer;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -5px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
  background: var(--gradient-eco);
  color: #ffffff;
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -5px rgba(16, 185, 129, 0.4);
}

.btn-outline {
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.btn-outline:hover {
  background: var(--bg-tertiary);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-glass {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  backdrop-filter: blur(8px);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* 3. HEADER & MEGA MENÚ */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  align-items: center;
  z-index: var(--z-sticky);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

header.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-glass);
  height: 70px;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-primary);
  font-weight: var(--fw-extrabold);
  font-size: var(--fs-xl);
  color: var(--text-primary);
}

.logo svg {
  width: 32px;
  height: 32px;
  fill: var(--color-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-secondary);
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Mega Menú Dropdown */
.has-megamenu {
  position: static;
}

.megamenu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-2xl) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: var(--z-dropdown);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.has-megamenu:hover .megamenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.megamenu-column h4 {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  border-left: 3px solid var(--color-primary);
  padding-left: var(--spacing-sm);
}

.megamenu-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.megamenu-item a {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
}

.megamenu-item a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.megamenu-info-card {
  background: var(--bg-tertiary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.megamenu-info-card h4 {
  border-left: none;
  padding-left: 0;
  color: var(--text-primary);
}

/* Controles de Accesibilidad / Tema */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.theme-toggle,
.accessibility-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover,
.accessibility-btn:hover {
  background-color: var(--bg-tertiary);
  color: var(--color-primary);
}

.theme-toggle svg,
.accessibility-btn svg {
  width: 20px;
  height: 20px;
}

/* Hamburguesa Móvil */
.menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  cursor: pointer;
  z-index: var(--z-menu);
}

.menu-btn span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

/* 4. BREADCRUMB */
.breadcrumb-nav {
  margin-top: 80px;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-tertiary);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  font-size: var(--fs-xs);
  color: var(--text-secondary);
}

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

.breadcrumb-item a:hover {
  color: var(--color-primary);
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  color: var(--text-muted);
}

.breadcrumb-item.active {
  color: var(--text-muted);
  font-weight: var(--fw-medium);
}

/* 5. HERO INTERNO Y HOMEPAGE */
.hero {
  position: relative;
  padding: 6rem 0 var(--spacing-4xl);
  overflow: hidden;
  background: var(--gradient-soft);
}

.hero-content {
  max-width: var(--max-width-md);
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-primary-light);
  color: var(--color-primary-hover);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--spacing-md);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: var(--lh-tight);
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  max-width: var(--max-width-sm);
  margin: 0 auto var(--spacing-xl);
}

/* 6. ACORDEÓN DE PREGUNTAS FRECUENTES (FAQ) */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: var(--max-width-md);
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover,
.faq-item.active {
  border-color: var(--color-primary);
}

.faq-header {
  width: 100%;
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: var(--font-primary);
  font-weight: var(--fw-semibold);
  text-align: left;
  background: none;
}

.faq-icon {
  width: 18px;
  height: 18px;
  fill: var(--text-secondary);
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  fill: var(--color-primary);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-out, padding var(--transition-normal);
  padding: 0 var(--spacing-lg);
}

.faq-item.active .faq-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
}

/* 7. FOOTER COMPLETO */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
  font-size: var(--fs-sm);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
}

.footer-brand h3 {
  font-size: var(--fs-xl);
  margin-bottom: var(--spacing-md);
}

.footer-brand p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 320px;
}

.footer-socials {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.social-link:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.footer-links h4 {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-lg);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-list a {
  color: var(--text-secondary);
}

.footer-list a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  color: var(--text-muted);
}

.footer-legal-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-legal-links a:hover {
  color: var(--text-secondary);
}

/* Botón Volver Arriba */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: var(--z-sticky);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}