/**
 * Novaskil - Estilos Principales
 * Diseño: Profesional / Light
 */

/* ========================================
   VARIABLES Y RESET
======================================== */
:root {
    /* Colores principales */
    --primary: #02315E;
    --primary-light: #0a4a8a;
    --primary-dark: #011e3a;
    --accent: #018A80;
    --accent-light: #02a89c;
    --secondary: #1c1d1f;
    --secondary-light: #3d3f45;

    /* Colores de fondo */
    --bg-main: #ffffff;
    --bg-alt: #f4f7fb;
    --bg-dark: #02315E;

    /* Superficies de tarjetas (reemplazan glass) */
    --glass-bg: #ffffff;
    --glass-bg-hover: #f7f9fa;
    --glass-border: #d1d7dc;
    --glass-shadow: rgba(0, 0, 0, 0.08);

    /* Texto */
    --text-primary: #1c1d1f;
    --text-secondary: #3d3f45;
    --text-muted: #6a6f73;

    /* Estados */
    --success: #1ea661;
    --warning: #c4711a;
    --error: #d93025;
    --info: #2d6be4;

    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Bordes */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 9999px;

    /* Transiciones */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Tipografía */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Plus Jakarta Sans', var(--font-main);
}

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

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

body {
    font-family: var(--font-main);
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: clip;
}

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

a:hover {
    color: var(--primary-dark);
}

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

/* Placeholder para imágenes que no cargan */
img[src=""],
img:not([src]),
img[src*="default"] {
    background: var(--bg-alt);
}

.course-card-image img,
.course-card-image {
    background: var(--bg-alt);
}

/* ========================================
   COMPONENTES CARD
======================================== */
.glass {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--glass-shadow);
}

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--glass-bg-hover);
    box-shadow: 0 4px 16px var(--glass-shadow);
}

/* ========================================
   TIPOGRAFÍA
======================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

.text-gradient {
    color: var(--primary);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* ========================================
   LAYOUT
======================================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-sm { max-width: 640px; }
.container-md { max-width: 768px; }
.container-lg { max-width: 1024px; }

.section {
    padding: var(--spacing-2xl) 0;
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ========================================
   NAVEGACIÓN
======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background: var(--bg-main);
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: var(--bg-main);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 1px 4px var(--glass-shadow);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.navbar-brand img {
    height: 40px;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    list-style: none;
}

.navbar-nav a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--primary);
}

.navbar-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-fast);
}

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

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

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .navbar-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-main);
        border-bottom: 1px solid var(--glass-border);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .navbar-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .navbar-toggle {
        display: block;
    }
}

/* ========================================
   BOTONES
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: white;
}

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

.btn-secondary:hover {
    background: var(--secondary-light);
    color: white;
}

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

.btn-glass:hover {
    background: var(--glass-border);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-full);
}

/* ========================================
   FORMULARIOS
======================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-main);
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(2, 49, 94, 0.12);
}

.form-control::placeholder {
    color: var(--text-muted);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236a6f73' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

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

.form-check-input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* ========================================
   TARJETAS DE CURSO
======================================== */
.course-card {
    background: var(--bg-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    position: relative;
    cursor: pointer;
}

.course-card:hover {
    box-shadow: 0 4px 16px var(--glass-shadow);
    border-color: #b5bac0;
}

.course-card-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.course-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.course-card:hover .course-card-image img {
    transform: scale(1.1);
}

.course-card-badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    padding: 0.25rem 0.75rem;
    background: var(--accent);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.course-card-content {
    padding: var(--spacing-lg);
}

.course-card-category {
    display: inline-block;
    margin-bottom: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 500;
}

.course-card-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card-title a {
    color: var(--text-primary);
}

.course-card-title a::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
}

.course-card-title a:hover {
    color: var(--primary);
}

.course-card-category,
.course-card-footer,
.course-card-badge {
    position: relative;
    z-index: 2;
}

.course-card-instructor {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.course-card-instructor img {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.course-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.course-card-meta i {
    margin-right: 4px;
    color: var(--primary);
}

.course-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
    margin-top: auto;
}

.course-card-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.course-card-price .original {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: line-through;
    margin-left: var(--spacing-sm);
}

.course-card-price.free {
    color: var(--success);
}

.stars-rating {
    display: flex;
    align-items: center;
    gap: 2px;
    color: #fbbf24;
}

.stars-rating .rating-number {
    margin-left: var(--spacing-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

/* ========================================
   HERO SECTION
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 600px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.hero-stat {
    text-align: center;
}

.hero-stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}

.hero-stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hero-slides {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.hero-slide {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: auto;
    opacity: 0;
    transition: opacity 1s ease;
    pointer-events: none;
}

.hero-slide.active {
    opacity: 1;
    pointer-events: auto;
}

.hero-slide img {
    height: 100%;
    width: auto;
    display: block;
}

.hero-image-fade {
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, #ffffff 0%, rgba(255,255,255,0.85) 25%, rgba(255,255,255,0.3) 55%, transparent 100%);
}

.hero-dots {
    position: absolute;
    bottom: 24px;
    right: 40px;
    display: flex;
    gap: 8px;
    z-index: 10;
}

.hero-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.25);
    border: 2px solid rgba(255,255,255,0.7);
    cursor: pointer;
    transition: all 0.3s;
    padding: 0;
}

.hero-dot.active {
    background: var(--primary);
    border-color: var(--primary);
    width: 22px;
    border-radius: 4px;
}

@media (max-width: 1024px) {
    .hero-slides {
        display: none;
    }
    .hero-dots {
        display: none;
    }

    .hero-content {
        max-width: 100%;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .hero {
        align-items: flex-start;
        padding-top: 100px;
        padding-bottom: var(--spacing-2xl);
        min-height: auto;
    }

    .hero-stats {
        gap: var(--spacing-xl);
        flex-wrap: wrap;
    }
}

/* ========================================
   CATEGORÍAS
======================================== */
.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xl);
    text-align: center;
    background: var(--bg-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.category-card:hover {
    background: var(--bg-alt);
    border-color: var(--primary);
}

.category-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    background: rgba(1, 138, 128, 0.1);
    border-radius: var(--radius-md);
    font-size: 1.75rem;
    color: var(--accent);
}

.category-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

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

/* ========================================
   TESTIMONIOS
======================================== */
.testimonial-card {
    padding: var(--spacing-xl);
    background: var(--bg-alt);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
}

.testimonial-content {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.testimonial-name {
    font-weight: 600;
    color: var(--text-primary);
}

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

/* ========================================
   FOOTER
======================================== */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background: var(--bg-dark);
    color: rgba(255,255,255,0.8);
    border-top: none;
    margin-top: var(--spacing-2xl);
}

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

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.footer-brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: rgba(255,255,255,0.5);
    margin-bottom: var(--spacing-lg);
}

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

@media (max-width: 768px) {
    .footer-social {
        justify-content: center;
    }
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-full);
    color: rgba(255,255,255,0.7);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: #ffffff;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255,255,255,0.5);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    color: rgba(255,255,255,0.4);
    font-size: 0.9rem;
}

/* ========================================
   ALERTAS
======================================== */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--warning);
}

.alert-info {
    background: rgba(2, 49, 94, 0.06);
    border: 1px solid rgba(2, 49, 94, 0.2);
    color: var(--primary);
}

/* ========================================
   BADGES
======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-primary {
    background: rgba(2, 49, 94, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.badge-error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
}

/* ========================================
   MODALES
======================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    background: var(--bg-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 40px rgba(0,0,0,0.15);
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* ========================================
   PROGRESO
======================================== */
.progress {
    height: 8px;
    background: var(--glass-bg);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

/* ========================================
   TABS
======================================== */
.tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--glass-border);
}

.tab {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    color: var(--text-muted);
    font-weight: 500;
    cursor: pointer;
    position: relative;
    transition: color var(--transition-fast);
}

.tab:hover,
.tab.active {
    color: var(--text-primary);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ========================================
   UTILIDADES
======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-error { color: var(--error); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.hidden { display: none !important; }
.visible { visibility: visible !important; }

/* Animaciones */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-fade-in { animation: fadeIn 0.5s ease forwards; }
.animate-slide-up { animation: slideUp 0.5s ease forwards; }
.animate-pulse { animation: pulse 2s infinite; }

/* Animaciones al scroll - sistema de clases */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animate-visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* Delays escalonados para grids */
.grid .animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.grid .animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.grid .animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.grid .animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.grid .animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.grid .animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }
.grid .animate-on-scroll:nth-child(7) { transition-delay: 0.6s; }
.grid .animate-on-scroll:nth-child(8) { transition-delay: 0.7s; }

/* Fallback: si JS no carga o falla, mostrar elementos */
@media (prefers-reduced-motion: reduce) {
    .animate-on-scroll {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* Asegurar visibilidad después de 2 segundos si JS falla */
.course-card, .category-card, .testimonial-card, .glass-card {
    opacity: 1;
    transform: none;
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: #b5bac0;
}

/* ========================================
   BREADCRUMB
======================================== */
.breadcrumb-nav {
    margin-bottom: var(--spacing-lg);
}

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.breadcrumb-item a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

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

.breadcrumb-item + .breadcrumb-item::before {
    content: '/';
    color: var(--glass-border);
}

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

/* ========================================
   RESPONSIVE — FIXES MÓVIL
======================================== */

/* Navbar: ocultar botones de sesión en desktop-auth en móvil,
   mostrar la versión del menú solo en móvil */
.navbar-nav-mobile-auth {
    display: none;
}

@media (max-width: 768px) {
    /* Ocultar botones de sesión del header en móvil */
    .navbar-desktop-auth {
        display: none;
    }

    /* Mostrar los mismos botones dentro del menú desplegable */
    .navbar-nav-mobile-auth {
        display: block;
        padding-top: var(--spacing-md);
        border-top: 1px solid var(--glass-border);
        margin-top: var(--spacing-sm);
    }

    /* Evitar que el contenedor del navbar desborde */
    .navbar-actions {
        gap: 0;
    }
}

/* Tabs: scroll horizontal en móvil (evita desbordamiento) */
@media (max-width: 640px) {
    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        flex-wrap: nowrap;
        scrollbar-width: none;
        padding-bottom: 1px; /* evita que el borde inferior se corte */
    }

    .tabs::-webkit-scrollbar {
        display: none;
    }

    .tab {
        white-space: nowrap;
        flex-shrink: 0;
        padding: var(--spacing-md) var(--spacing-md);
    }
}

/* ========================================
   CURSO DETALLE
======================================== */
.curso-layout {
    align-items: flex-start;
}

.course-detail-aside {
    width: 380px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
}

@media (max-width: 1024px) {
    .curso-layout {
        flex-direction: column;
        align-items: stretch;
    }
    .course-detail-aside {
        width: 100%;
        position: static;
        order: -1;
    }
}

.glass.expanded .section-content {
    display: block !important;
}
.glass.expanded .fa-chevron-down {
    transform: rotate(180deg);
    transition: transform var(--transition-fast);
}

a.lesson-row:hover {
    background: var(--glass-bg-hover);
}

/* Utilidad mt-1 (usada en el admin) */
.mt-1 { margin-top: var(--spacing-sm); }