/* ==========================================================================
   SISTEMA DE DISEÑO DE SISTEMAS RW7 & CARW7
   Estilos CSS Modernos - Vanilla CSS con Soporte Premium, Responsivo y Animado
   ========================================================================== */

/* Variables y Tokens de Diseño */
:root {
    --font-primary: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Colores del Logo Armonizados */
    --color-bg-dark: #070a13;         /* Fondo oscuro profundo */
    --color-bg-card: #0f1424;         /* Contenedores y Tarjetas */
    --color-bg-nav: rgba(11, 16, 36, 0.85); /* Navbar con transparencia para Glassmorphism */
    
    --color-primary: #1e40af;         /* Azul RW7 (Logo) */
    --color-primary-light: #3b82f6;   /* Azul Brillante */
    --color-secondary: #f97316;       /* Naranja RW7 (Logo) */
    --color-secondary-light: #fb923c; /* Naranja Brillante */
    
    --color-text-main: #f8fafc;       /* Texto principal (casi blanco) */
    --color-text-muted: #94a3b8;      /* Texto secundario/apagado */
    --color-border: rgba(255, 255, 255, 0.08); /* Bordes sutiles */
    --color-border-hover: rgba(59, 130, 246, 0.3);
    
    /* Sombras y Efectos */
    --shadow-premium: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
    --shadow-glow-blue: 0 0 20px rgba(59, 130, 246, 0.25);
    --shadow-glow-orange: 0 0 20px rgba(249, 115, 22, 0.25);
    --glass-blur: blur(12px);
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-dark);
    color: var(--color-text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ==========================================================================
   DISEÑO DEL NAVBAR (Glassmorphism & Responsivo)
   ========================================================================== */
.header-main {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--color-bg-nav);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-smooth);
}

.header-scrolled {
    background-color: rgba(7, 10, 19, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    padding: 5px 0;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 15px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logotipo */
.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.5px;
    transition: var(--transition-smooth);
}

.logo-img {
    height: 42px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 0 4px rgba(59, 130, 246, 0.3));
    transition: var(--transition-smooth);
}

.logo-link:hover .logo-img {
    transform: scale(1.05) rotate(3deg);
    filter: drop-shadow(0 0 8px rgba(249, 115, 22, 0.5));
}

.logo-text {
    background: linear-gradient(135deg, var(--color-text-main) 60%, var(--color-secondary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Menú de Navegación */
.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition-smooth);
    display: inline-block;
}

.nav-link:hover {
    color: var(--color-text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

/* Clase Activa (Página Actual) */
.nav-link.active {
    color: var(--color-primary-light);
    font-weight: 600;
    background-color: rgba(59, 130, 246, 0.08);
}

/* Botón Destacado del Menú (Aula Virtual / Cursos) */
.nav-btn-highlight .nav-link {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-glow-blue);
    font-weight: 600;
}

.nav-btn-highlight .nav-link:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, #60a5fa 100%);
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(59, 130, 246, 0.4);
}

/* Botón Hamburguesa (Móvil) */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1100;
}

.menu-toggle span {
    width: 100%;
    height: 3px;
    background-color: var(--color-text-main);
    border-radius: 3px;
    transition: var(--transition-smooth);
    transform-origin: left center;
}

/* Animación Hamburguesa Activa */
.menu-toggle.open span:nth-child(1) {
    transform: rotate(45deg);
}

.menu-toggle.open span:nth-child(2) {
    width: 0%;
    opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
    transform: rotate(-45deg);
}

/* ==========================================================================
   ESTRUCTURA DE CONTENIDO Y GRID
   ========================================================================== */
.main-wrapper {
    flex: 1;
    margin-top: 80px; /* Compensa la barra fija del Navbar */
    display: flex;
    flex-direction: column;
}

.container-main {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* ==========================================================================
   FOOTER PREMIUM
   ========================================================================== */
.footer-main {
    background-color: #04060d;
    border-top: 1px solid var(--color-border);
    padding: 60px 0 30px;
    margin-top: auto;
}

.footer-grid {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-desc {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    max-width: 320px;
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-main);
    margin-bottom: 20px;
    position: relative;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--color-secondary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: var(--transition-smooth);
}

.footer-link:hover {
    color: var(--color-text-main);
    padding-left: 5px;
}

.footer-contact-info {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-bottom {
    max-width: 1280px;
    margin: 40px auto 0;
    padding: 20px 24px 0;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    flex-wrap: wrap;
    gap: 20px;
}

/* ==========================================================================
   ELEMENTOS DE INTERFAZ REUTILIZABLES (Botones, Tarjetas, Secciones)
   ========================================================================== */
.btn-premium {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: #ffffff;
    box-shadow: var(--shadow-glow-blue);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, #60a5fa 100%);
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
    color: #ffffff;
    box-shadow: var(--shadow-glow-orange);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--color-secondary-light) 0%, #ffedd5 100%);
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(249, 115, 22, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-main);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--color-text-muted);
}

/* Tarjetas (Cards) de UI */
.card-premium {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-premium);
    transition: var(--transition-smooth);
}

.card-premium:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), var(--shadow-glow-blue);
}

/* ==========================================================================
   MEDIA QUERIES (Responsividad)
   ========================================================================== */
@media (max-width: 991px) {
    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: rgba(7, 10, 19, 0.98);
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 50px;
        gap: 20px;
        transition: var(--transition-smooth);
        border-top: 1px solid var(--color-border);
    }

    .nav-menu.open {
        left: 0;
    }

    .nav-link {
        font-size: 1.2rem;
        width: 100%;
        text-align: center;
        padding: 15px 40px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

@media (max-width: 576px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .nav-container {
        padding: 15px 16px;
    }
}

/* ==========================================================================
   ESTILOS DE FORMULARIO GLOBALES
   ========================================================================== */
.form-group {
    margin-bottom: 20px;
    text-align: left; /* Asegura alineación correcta de etiquetas */
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-main);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-smooth);
    display: block; /* Asegura que tome toda la línea */
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
    background-color: rgba(255, 255, 255, 0.06);
}

/* ==========================================================================
   ESTILOS PARA EL MODAL DE DESCARGA GLOBAL (Efecto de Cristal)
   ========================================================================== */
.download-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(4, 6, 13, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
    overflow-y: auto;
    padding: 20px;
}

.download-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.download-modal {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 32px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8), var(--shadow-glow-blue);
    transform: translateY(-50px);
    transition: var(--transition-smooth);
}

/* Personalizar barra de scroll interna del modal (estilo sutil/dark) */
.download-modal::-webkit-scrollbar {
    width: 6px;
}
.download-modal::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
}
.download-modal::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}
.download-modal::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-light);
}

.download-modal-overlay.active .download-modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text-main);
}

.modal-close-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.modal-close-btn:hover {
    color: var(--color-text-main);
}

.toast-success {
    display: none;
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid #10b981;
    color: #10b981;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    text-align: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}