/* ========================================
   ITS María Auxiliadora - Estilos Principales
   ======================================== */

/* Variables CSS */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #f59e0b;
    --accent: #ec4899;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --light: #f8fafc;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --white: #ffffff;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-4: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gradient-5: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --radius-sm: 8px;
    --radius: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: 'Inter', 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--light);
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

/* ========================================
   NAVEGACIÓN
   ======================================== */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.2rem 5%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
    transition: var(--transition);
}

nav.scrolled,
nav.nav-scrolled {
    padding: 0.8rem 5%;
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.98);
}

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

.logo {
    font-family: 'Outfit', sans-serif;
    font-size: 1.4rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 1001;
}

.logo i {
    font-size: 1.6rem;
    -webkit-text-fill-color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    font-family: 'Outfit', sans-serif;
    font-weight: 500;
    color: var(--dark);
    position: relative;
    font-size: 0.95rem;
    padding: 0.5rem 0;
}

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

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

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

.cta-nav {
    background: var(--gradient-1);
    color: white !important;
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-full);
    transition: var(--transition) !important;
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.cta-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.4);
}

.cta-nav::after {
    display: none !important;
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
    z-index: 1001;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    background: rgba(99, 102, 241, 0.1);
}

.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

/* ========================================
   BOTONES
   ======================================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--gradient-1);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: var(--radius-full);
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: transparent;
    color: var(--dark);
    padding: 1rem 2.5rem;
    border-radius: var(--radius-full);
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid var(--dark);
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--dark);
    color: white;
    transform: translateY(-3px);
}

.btn-white {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: white;
    color: var(--primary);
    padding: 1rem 2.5rem;
    border-radius: var(--radius-full);
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-white:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(255, 255, 255, 0.2);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: transparent;
    color: white;
    padding: 1rem 2.5rem;
    border-radius: var(--radius-full);
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    border: 2px solid white;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-small {
    padding: 0.7rem 1.5rem;
    font-size: 0.9rem;
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 5% 4rem;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #e2e8f0 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 800px;
    height: 800px;
    background: var(--gradient-1);
    border-radius: 50%;
    opacity: 0.08;
    animation: float 20s infinite ease-in-out;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: var(--gradient-2);
    border-radius: 50%;
    opacity: 0.08;
    animation: float 15s infinite ease-in-out reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(30px, 50px) rotate(180deg); }
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--dark) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content .highlight {
    color: var(--secondary);
    -webkit-text-fill-color: var(--secondary);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--gray);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-bottom: 3rem;
}

.stat {
    text-align: center;
}

.stat-number {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    display: block;
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
    font-weight: 500;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
}

.hero-image-container {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-5deg);
    transition: var(--transition-slow);
}

.hero-image-container:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.hero-image {
    width: 100%;
    height: 500px;
    object-fit: cover;
}

.floating-card {
    position: absolute;
    background: white;
    padding: 1.2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: floatCard 6s infinite ease-in-out;
    z-index: 10;
}

.floating-card-1 {
    top: 10%;
    left: -10%;
    animation-delay: 0s;
}

.floating-card-2 {
    bottom: 20%;
    right: -10%;
    animation-delay: 3s;
}

@keyframes floatCard {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.floating-card i {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.floating-card h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: var(--dark);
}

.floating-card p {
    font-size: 0.85rem;
    color: var(--gray);
}

/* ========================================
   SECTIONS COMMON
   ======================================== */
.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
}

.section-tag {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.section-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--dark);
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray);
    line-height: 1.6;
}

/* ========================================
   COURSES SECTION
   ======================================== */
.courses {
    padding: 6rem 5%;
    background: white;
}

.courses-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.course-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.course-card:hover::before {
    transform: scaleX(1);
}

.course-image-wrapper {
    position: relative;
    overflow: hidden;
}

.course-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition-slow);
}

.course-card:hover .course-image {
    transform: scale(1.05);
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--secondary);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: var(--radius-full);
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 0.8rem;
}

.course-content {
    padding: 1.5rem;
}

.course-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
    font-size: 1.3rem;
}

.course-card:nth-child(2) .course-icon { background: var(--gradient-2); }
.course-card:nth-child(3) .course-icon { background: var(--gradient-3); }
.course-card:nth-child(4) .course-icon { background: var(--gradient-4); }
.course-card:nth-child(5) .course-icon { background: var(--gradient-5); }

.course-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--dark);
}

.course-description {
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.course-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.course-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.4rem;
    color: var(--dark);
    font-size: 0.9rem;
}

.course-features li i {
    color: var(--success);
    font-size: 0.9rem;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.2rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.course-duration {
    font-family: 'Outfit', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
}

.course-duration span {
    font-size: 0.85rem;
    color: var(--gray);
    font-weight: 400;
}

.course-btn {
    color: var(--primary);
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 0.9rem;
}

.course-btn:hover {
    gap: 0.8rem;
}

/* ========================================
   WHY US SECTION
   ======================================== */
.why-us {
    padding: 6rem 5%;
    background: var(--gradient-1);
    color: white;
    position: relative;
    overflow: hidden;
}

.why-us::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid' width='100' height='100' patternUnits='userSpaceOnUse'%3E%3Cpath d='M 100 0 L 0 0 0 100' fill='none' stroke='rgba(255,255,255,0.1)' stroke-width='1'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='url(%23grid)'/%3E%3C/svg%3E");
    opacity: 0.3;
}

.why-us-container {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.why-us-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.why-us-content h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.why-us-content p {
    font-size: 1.1rem;
    opacity: 0.9;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.features-list {
    display: grid;
    gap: 1.2rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 1.2rem;
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateX(10px);
    background: rgba(255, 255, 255, 0.2);
}

.feature-icon {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.feature-text h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.feature-text p {
    font-size: 0.9rem;
    opacity: 0.8;
    margin: 0;
}

.why-us-visual {
    position: relative;
}

.stats-card {
    background: white;
    color: var(--dark);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.stat-item {
    text-align: center;
    padding: 1.2rem;
    border-radius: var(--radius-md);
    background: rgba(99, 102, 241, 0.05);
    transition: var(--transition);
}

.stat-item:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-5px);
}

.stat-item i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 0.8rem;
}

.stat-item h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.3rem;
}

.stat-item p {
    font-size: 0.85rem;
    color: var(--gray);
    font-weight: 500;
    margin: 0;
}

/* ========================================
   TESTIMONIALS SECTION
   ======================================== */
.testimonials {
    padding: 6rem 5%;
    background: var(--light);
}

.testimonials-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    position: relative;
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: 30px;
    font-size: 5rem;
    color: var(--primary);
    opacity: 0.1;
    font-family: Georgia, serif;
    line-height: 1;
}

.stars {
    color: var(--secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.testimonial-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--dark);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1.2rem;
}

.author-info h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    margin-bottom: 0.2rem;
    color: var(--dark);
}

.author-info p {
    color: var(--gray);
    font-size: 0.85rem;
}

/* ========================================
   CTA SECTION
   ======================================== */
.cta-section {
    padding: 6rem 5%;
    background: var(--dark);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   FOOTER
   ======================================== */
footer {
    background: #020617;
    color: white;
    padding: 4rem 5% 1.5rem;
}

.footer-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand p {
    color: var(--gray-light);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.social-links {
    display: flex;
    gap: 0.8rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-column h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
    color: white;
}

.footer-column li {
    margin-bottom: 0.6rem;
}

.footer-column a {
    color: var(--gray-light);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

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

.footer-column a i {
    font-size: 0.7rem;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--gray);
    font-size: 0.85rem;
}

/* ========================================
   BACK TO TOP BUTTON
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ========================================
   ANIMACIONES
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation delays */
.fade-in:nth-child(1) { transition-delay: 0.1s; }
.fade-in:nth-child(2) { transition-delay: 0.2s; }
.fade-in:nth-child(3) { transition-delay: 0.3s; }
.fade-in:nth-child(4) { transition-delay: 0.4s; }
.fade-in:nth-child(5) { transition-delay: 0.5s; }

/* ========================================
   PÁGINA VIRTUAL - CLASES EN LÍNEA
   ======================================== */
.page-header {
    padding: 10rem 5% 4rem;
    background: var(--gradient-1);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid' width='100' height='100' patternUnits='userSpaceOnUse'%3E%3Cpath d='M 100 0 L 0 0 0 100' fill='none' stroke='rgba(255,255,255,0.1)' stroke-width='1'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='url(%23grid)'/%3E%3C/svg%3E");
    opacity: 0.3;
}

.page-header-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.page-header h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.virtual-features {
    padding: 5rem 5%;
    background: white;
}

.virtual-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.virtual-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.virtual-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.virtual-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.virtual-card:nth-child(2) .virtual-icon { background: var(--gradient-2); }
.virtual-card:nth-child(3) .virtual-icon { background: var(--gradient-3); }
.virtual-card:nth-child(4) .virtual-icon { background: var(--gradient-4); }

.virtual-card h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

.virtual-card p {
    color: var(--gray);
    line-height: 1.6;
}

.platforms-section {
    padding: 5rem 5%;
    background: var(--light);
}

.platforms-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.platform-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.platform-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.platform-card i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.platform-card h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    color: var(--dark);
}

/* ========================================
   PÁGINA BIBLIOTECA
   ======================================== */
.library-search {
    padding: 3rem 5%;
    background: white;
}

.search-container {
    max-width: 700px;
    margin: 0 auto;
}

.search-box {
    display: flex;
    gap: 1rem;
    background: var(--light);
    padding: 0.5rem;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow);
}

.search-box input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    background: transparent;
    font-size: 1rem;
    outline: none;
}

.search-box input::placeholder {
    color: var(--gray);
}

.search-box button {
    padding: 1rem 2rem;
}

.library-categories {
    padding: 4rem 5%;
    background: var(--light);
}

.categories-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.category-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.category-card:nth-child(2) .category-icon { background: var(--gradient-2); }
.category-card:nth-child(3) .category-icon { background: var(--gradient-3); }
.category-card:nth-child(4) .category-icon { background: var(--gradient-4); }
.category-card:nth-child(5) .category-icon { background: var(--gradient-5); }
.category-card:nth-child(6) .category-icon { background: var(--gradient-1); }

.category-info h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 0.3rem;
}

.category-info p {
    color: var(--gray);
    font-size: 0.9rem;
}

.resources-section {
    padding: 4rem 5%;
    background: white;
}

.resources-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background: var(--light);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: var(--transition);
}

.resource-card:hover {
    background: white;
    box-shadow: var(--shadow);
    transform: translateY(-5px);
}

.resource-icon {
    width: 50px;
    height: 50px;
    background: white;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.3rem;
    flex-shrink: 0;
}

.resource-info h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    color: var(--dark);
    margin-bottom: 0.3rem;
}

.resource-info p {
    color: var(--gray);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.resource-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--gray);
}

.resource-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* ========================================
   RESPONSIVE DESIGN - TABLET
   ======================================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
        max-width: 600px;
        margin: 0 auto;
    }
    
    .hero-image {
        height: 350px;
    }
    
    .floating-card {
        display: none;
    }
    
    .why-us-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .why-us-content h2 {
        font-size: 2rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
    
    .page-header h1 {
        font-size: 2.5rem;
    }
}

/* ========================================
   RESPONSIVE DESIGN - MOBILE
   ======================================== */
@media (max-width: 768px) {
    nav {
        padding: 1rem 5%;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 6rem 2rem 2rem;
        gap: 1.5rem;
        transition: var(--transition);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
        align-items: flex-start;
        z-index: 999;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links a {
        font-size: 1.1rem;
        width: 100%;
        padding: 0.5rem 0;
    }
    
    .cta-nav {
        width: 100%;
        text-align: center;
        margin-top: 1rem;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding: 7rem 5% 3rem;
        min-height: auto;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
        margin-bottom: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial-card {
        padding: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    
    .stat-item h4 {
        font-size: 1.5rem;
    }
    
    .cta-section h2 {
        font-size: 1.8rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-white, .btn-outline {
        width: 100%;
        justify-content: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .footer-brand {
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .footer-column h4 {
        margin-bottom: 1rem;
    }
    
    .footer-column a {
        justify-content: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .page-header {
        padding: 8rem 5% 3rem;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .search-box {
        flex-direction: column;
        border-radius: var(--radius-lg);
    }
    
    .search-box button {
        width: 100%;
    }
}

/* ========================================
   RESPONSIVE DESIGN - SMALL MOBILE
   ======================================== */
@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .why-us-content h2 {
        font-size: 1.6rem;
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .floating-card {
        display: none;
    }
    
    .page-header h1 {
        font-size: 1.6rem;
    }
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}