/* ============================================
   RESET Y CONFIGURACIÓN BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 🎨 TEMA CLARO (DEFAULT) */
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-secondary: #059669;
    --color-accent: #fbbf24;
    --color-accent-hover: #f59e0b;
    
    /* Fondo y superficies - TEMA CLARO */
    --color-bg: #f5f5f5;
    --color-bg-card: #ffffff;
    --color-bg-card-hover: #fafafa;
    --color-navbar: #ffffff;
    
    /* Textos - TEMA CLARO */
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-text-light: #9ca3af;
    
    /* Bordes - TEMA CLARO */
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    
    /* Sombras - TEMA CLARO */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    
    /* Espaciado y tipografía */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-base: 16px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    --transition: all 0.3s ease-in-out;
}

/* 🌙 TEMA OSCURO */
body.dark-theme {
    /* Fondo y superficies - TEMA OSCURO */
    --color-bg: #0f0f11;
    --color-bg-card: #18181b;
    --color-bg-card-hover: #1f1f23;
    --color-navbar: #18181b;
    
    /* Textos - TEMA OSCURO */
    --color-text: #f4f4f5;
    --color-text-muted: #a1a1aa;
    --color-text-light: #71717a;
    
    /* Bordes - TEMA OSCURO */
    --color-border: #27272a;
    --color-border-light: #1f1f23;
    
    /* Sombras - TEMA OSCURO */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
}

/* ============================================
   ESTILOS GLOBALES
   ============================================ */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

/* ============================================
   BOTONES
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    gap: 0.5rem;
}

/* 🔘 BOTÓN TOGGLE TEMA */
.btn-theme-toggle {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: 0.6rem 0.8rem;
    margin-right: var(--spacing-xs);
    position: relative;
    overflow: hidden;
}

.btn-theme-toggle:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-text-muted);
}

.theme-icon {
    font-size: 1.2rem;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-icon.moon {
    display: none;
}

.theme-icon.sun {
    display: inline;
}

/* Mostrar luna cuando está en tema oscuro */
body.dark-theme .theme-icon.sun {
    display: none;
}

body.dark-theme .theme-icon.moon {
    display: inline;
}

/* 🔘 BOTÓN LOGIN */
.btn-login {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-login:hover {
    background: var(--color-bg-card);
    border-color: var(--color-text-muted);
}

/* 🔘 BOTÓN REGISTRARSE */
.btn-register {
    background: var(--color-primary);
    color: white;
    border: 1px solid var(--color-primary);
}

.btn-register:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 🔘 BOTÓN PRIMARIO (Dorado estilo Skool) */
.btn-primary {
    background: var(--color-accent);
    color: #1f2937;
    width: 100%;
    font-weight: 600;
    border: 1px solid var(--color-accent);
}

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

/* 🔘 BOTÓN SECUNDARIO */
.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    cursor: not-allowed;
}

/* ============================================
   BARRA DE NAVEGACIÓN
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-navbar);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--spacing-md);
    height: 64px;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.navbar-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo a {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.025em;
}

.navbar-logo a:hover {
    opacity: 0.7;
}

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

/* ============================================
   CONTENIDO PRINCIPAL
   ============================================ */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    padding-top: calc(var(--spacing-lg) + 64px);
}

/* ============================================
   SECCIÓN HERO
   ============================================ */
.hero-section {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* COLUMNA IZQUIERDA */
.media-player-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    /* 🔹 Asegura que todo esté alineado a la izquierda */
    align-items: stretch;
}

/* BLOQUE PRINCIPAL DE VIDEO */
.main-display {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.main-display iframe,
.main-display video,
.main-display img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border: none;
}

/* 🖼️ GALERÍA DE MINIATURAS */
.thumbnails-container {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-xs) 0;
    scroll-behavior: smooth;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.thumbnails-container::-webkit-scrollbar {
    display: none;
}

.thumbnail {
    flex: 0 0 auto;
    width: 120px;
    aspect-ratio: 16/9;
    background: var(--color-bg-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.thumbnail:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.thumbnail.active {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2), var(--shadow-md);
}

.thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 32px;
    height: 32px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.75rem;
    opacity: 0;
    transition: var(--transition);
}

.thumbnail:hover .play-icon {
    opacity: 1;
}

/* 🔷 SIDEBAR PROMOCIONAL */
.promo-sidebar {
    background: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    height: fit-content;
    position: sticky;
    top: 80px;
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.promo-image {
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
}

.promo-img {
    width: 100%;
    height: auto;
    aspect-ratio: 16/9;
    object-fit: cover;
}

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

.promo-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text);
}

.promo-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-secondary);
    line-height: 1.2;
}

.promo-btn {
    margin-top: var(--spacing-xs);
}

.promo-stats {
    display: flex;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border-light);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ============================================
   SECCIÓN DESCRIPCIÓN DEL CURSO
   ============================================ */
.course-description {
    width: 100%;
    /* 🔹 ALINEADO CON LA COLUMNA IZQUIERDA */
    margin: 0;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.course-title {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

.course-text {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 100%;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xl);
    background: var(--color-bg-card);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

.footer-link:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.footer-copy {
    margin-top: var(--spacing-sm);
    color: var(--color-text-light);
    font-size: 0.85rem;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .hero-section {
        grid-template-columns: 1fr;
    }
    
    .promo-sidebar {
        position: static;
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 0 var(--spacing-sm);
        height: 56px;
    }
    
    .navbar-logo a {
        font-size: 1.1rem;
    }
    
    .navbar-actions .btn {
        padding: 0.5rem 0.9rem;
        font-size: 0.85rem;
    }
    
    .btn-theme-toggle {
        padding: 0.5rem 0.7rem;
    }
    
    .main-content {
        padding: var(--spacing-md);
        padding-top: calc(var(--spacing-md) + 56px);
    }
    
    .thumbnail {
        width: 100px;
    }
    
    .course-title {
        font-size: 1.5rem;
    }
    
    .promo-subtitle {
        font-size: 1.25rem;
    }
    
    .course-description {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .navbar-actions {
        gap: var(--spacing-xs);
    }
    
    .btn {
        padding: 0.6rem 0.9rem;
        font-size: 0.8rem;
    }
    
    .btn-theme-toggle {
        padding: 0.5rem 0.6rem;
    }
    
    .thumbnails-container {
        gap: var(--spacing-xs);
    }
    
    .thumbnail {
        width: 80px;
    }
    
    .promo-stats {
        gap: var(--spacing-md);
    }
    
    .stat-number {
        font-size: 1.1rem;
    }
    
    .course-description {
        padding: var(--spacing-md);
    }
    
    .course-title {
        font-size: 1.3rem;
    }
    
    .course-text {
        font-size: 1rem;
    }
}

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

.main-display,
.thumbnails-container,
.promo-sidebar,
.course-description {
    animation: fadeIn 0.4s ease-out forwards;
}

.promo-sidebar { animation-delay: 0.1s; }
.course-description { animation-delay: 0.2s; }

.promo-sidebar:hover,
.main-display:hover {
    box-shadow: var(--shadow-md);
    transition: box-shadow 0.3s ease;
}