/* Reset y Estilos Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-primary);
}

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

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

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
}

/* --- Layout del Header (Glassmorphism & Shadows) --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--header-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Menú de Navegación */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-item {
    position: relative;
}

.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
    color: var(--accent);
    background-color: var(--bg-secondary);
}

/* Mega Menú Dropdown con Sombras y Glassmorphism */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    width: 320px;
    display: none;
    grid-template-columns: 1fr;
    gap: 0.5rem;
    list-style: none;
    z-index: 1001;
    box-shadow: var(--shadow-md);
    animation: menuFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-item:hover .dropdown-menu {
    display: grid;
}

.dropdown-link {
    display: block;
    padding: 0.6rem var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.dropdown-link:hover {
    background: var(--bg-tertiary);
    color: var(--accent);
}

/* Botón de Tema */
.theme-toggle-btn {
    font-size: 1.25rem;
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: var(--border-radius-full);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

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

/* Hamburguesa móvil */
.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* --- Hero Section --- */
.hero {
    padding: 11rem var(--spacing-md) 7rem var(--spacing-md);
    background: radial-gradient(circle at top right, rgba(var(--primary-hsl), 0.08), transparent 40%), var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-tag {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, var(--text-primary) 30%, hsl(var(--primary-hsl)) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

/* Botones Premium con Sombras */
.btn-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 0.9rem 1.8rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
    background-color: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Breadcrumbs */
.breadcrumb-container {
    max-width: 1200px;
    margin: 1.5rem auto 0 auto;
    padding: 0 var(--spacing-md);
}

.breadcrumb {
    display: flex;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    list-style: none;
}

.breadcrumb-item::after {
    content: "/";
    margin-left: 0.5rem;
}

.breadcrumb-item:last-child::after {
    content: "";
}

.breadcrumb-item a {
    color: var(--text-secondary);
}

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

/* --- Secciones de Contenido General --- */
.section {
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 4rem auto;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1.2rem;
    letter-spacing: -0.02em;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Grids Generales */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.75rem;
}

/* Tarjetas Animadas Modernas con Sombras Stripe */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 2.25rem;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.card:hover {
    border-color: var(--accent);
    background-color: var(--bg-secondary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    font-size: 2.75rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
    display: inline-block;
}

.card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.85rem;
    letter-spacing: -0.01em;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.98rem;
    line-height: 1.6;
}

/* --- Footer --- */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 6rem var(--spacing-md) 3rem var(--spacing-md);
    color: var(--text-secondary);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand h3 {
    font-size: 1.65rem;
    color: var(--accent);
    margin-bottom: 1.25rem;
}

.footer-brand p {
    margin-bottom: 1.75rem;
    max-width: 320px;
    font-size: 0.98rem;
}

.footer-links h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.footer-links a {
    transition: color var(--transition-fast), transform var(--transition-fast);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--accent);
    transform: translateX(3px);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.92rem;
}

.footer-legal-links {
    display: flex;
    gap: 1.75rem;
}

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

/* Botón Volver Arriba */
.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 3.25rem;
    height: 3.25rem;
    border-radius: var(--border-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    box-shadow: var(--shadow-md);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.scroll-to-top.active {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent);
    transform: translateY(-3px);
}

@keyframes menuFadeIn {
    from { opacity: 0; transform: translateX(-50%) translateY(15px); }
    to { opacity: 1; transform: translateX(-50%) translateY(10px); }
}