* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --dark-color: #1e293b;
            --light-color: #f8fafc;
            --text-color: #334155;
            --border-color: #e2e8f0;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --danger-color: #ef4444;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header Styles */
        header {
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            transition: all 0.3s ease;
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }

        .logo {
            font-size: 2rem;
            font-weight: bold;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo i {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        .nav-menu a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 500;
            transition: all 0.3s ease;
            padding: 0.5rem 1rem;
            border-radius: 8px;
        }

        .nav-menu a:hover {
            color: var(--primary-color);
            background: rgba(37, 99, 235, 0.1);
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 0.7rem 1.5rem;
            border: none;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
        }

        /* Hero Section */
        .hero {
            margin-top: 80px;
            padding: 4rem 0;
            background: white;
            border-radius: 0 0 50px 50px;
        }

        .hero-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
            padding: 2rem 0;
        }

        .hero-text h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            color: var(--dark-color);
            margin-bottom: 1.5rem;
        }

        .hero-text .gradient-text {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-text p {
            font-size: 1.2rem;
            color: var(--text-color);
            margin-bottom: 2rem;
        }

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

        .btn-secondary {
            background: white;
            color: var(--primary-color);
            border: 2px solid var(--primary-color);
            padding: 0.7rem 1.5rem;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

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

        .hero-image {
            position: relative;
        }

        .hero-image img {
            width: 100%;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }

        .floating-card {
            position: absolute;
            background: white;
            padding: 1rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            animation: float 3s ease-in-out infinite;
        }

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

        .stats-card {
            top: -20px;
            right: -20px;
            text-align: center;
        }

        .stats-card .number {
            font-size: 2rem;
            font-weight: bold;
            color: var(--primary-color);
        }

        /* Categories Section */
        .categories {
            padding: 4rem 0;
            background: white;
            margin: 2rem 0;
            border-radius: 30px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 3rem;
        }

        .section-header h2 {
            font-size: 2.5rem;
            color: var(--dark-color);
            margin-bottom: 1rem;
        }

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

        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }

        .category-card {
            background: white;
            border: 2px solid var(--border-color);
            border-radius: 20px;
            padding: 2rem;
            text-align: center;
            transition: all 0.3s ease;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }

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

        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
            border-color: transparent;
        }

        .category-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .category-card h3 {
            font-size: 1.3rem;
            color: var(--dark-color);
            margin-bottom: 0.5rem;
        }

        .category-card .course-count {
            color: var(--text-color);
            font-size: 0.9rem;
        }

        .category-card .badge {
            display: inline-block;
            background: var(--success-color);
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.8rem;
            margin-top: 1rem;
        }

        /* Featured Courses */
        .featured-courses {
            padding: 4rem 0;
            background: white;
            margin: 2rem 0;
            border-radius: 30px;
        }

        .course-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
        }

        .course-card {
            background: white;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }

        .course-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }

        .course-video {
            position: relative;
            padding-bottom: 56.25%;
            height: 0;
            overflow: hidden;
        }

        .course-video iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }

        .course-info {
            padding: 1.5rem;
        }

        .course-category {
            display: inline-block;
            background: rgba(102, 126, 234, 0.1);
            color: var(--primary-color);
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.8rem;
            margin-bottom: 1rem;
            font-weight: 600;
        }

        .course-info h3 {
            color: var(--dark-color);
            margin-bottom: 0.5rem;
            font-size: 1.3rem;
        }

        .course-info .instructor {
            color: var(--text-color);
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        .course-info .instructor i {
            color: var(--primary-color);
            margin-right: 0.5rem;
        }

        .course-info p {
            color: var(--text-color);
            line-height: 1.6;
            margin-bottom: 1rem;
        }

        .course-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 1rem;
            border-top: 1px solid var(--border-color);
        }

        .course-meta .views {
            color: var(--text-color);
            font-size: 0.9rem;
        }

        .course-meta .rating {
            color: #f59e0b;
        }

        /* Social Section */
        .social-section {
            padding: 4rem 0;
            background: white;
            margin: 2rem 0;
            border-radius: 30px;
            text-align: center;
        }

        .social-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-top: 2rem;
        }

        .social-link {
            width: 80px;
            height: 80px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            transition: all 0.3s ease;
            text-decoration: none;
            position: relative;
            overflow: hidden;
        }

        .social-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(255,255,255,0.3), rgba(255,255,255,0));
            transform: translateX(-100%);
            transition: transform 0.3s ease;
        }

        .social-link:hover::before {
            transform: translateX(0);
        }

        .social-link:hover {
            transform: translateY(-5px);
        }

        .social-facebook {
            background: #1877f2;
            color: white;
            box-shadow: 0 5px 15px rgba(24, 119, 242, 0.3);
        }

        .social-youtube {
            background: #ff0000;
            color: white;
            box-shadow: 0 5px 15px rgba(255, 0, 0, 0.3);
        }

        .social-whatsapp {
            background: #25d366;
            color: white;
            box-shadow: 0 5px 15px rgba(37, 211, 102, 0.3);
        }

        /* Footer */
        footer {
            background: white;
            padding: 3rem 0 1rem 0;
            margin-top: 2rem;
            border-radius: 30px 30px 0 0;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 2rem;
        }

        .footer-section h3 {
            color: var(--dark-color);
            margin-bottom: 1rem;
        }

        .footer-section p, .footer-section ul {
            color: var(--text-color);
            line-height: 1.8;
        }

        .footer-section ul {
            list-style: none;
        }

        .footer-section ul li {
            margin-bottom: 0.5rem;
        }

        .footer-section a {
            color: var(--text-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid var(--border-color);
            color: var(--text-color);
        }

        /* Mobile Menu Button */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark-color);
            cursor: pointer;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                left: -100%;
                top: 70px;
                flex-direction: column;
                background: white;
                width: 100%;
                text-align: center;
                transition: 0.3s;
                box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
                padding: 2rem 0;
            }

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

            .mobile-menu-btn {
                display: block;
            }

            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
            }

            .hero-text h1 {
                font-size: 2.5rem;
            }

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

            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }

            .course-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Loading Animation */
        .skeleton {
            background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
            background-size: 200% 100%;
            animation: loading 1.5s infinite;
        }

        @keyframes loading {
            0% { background-position: 200% 0; }
            100% { background-position: -200% 0; }
        }

        /* Scroll to Top Button */
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
        }

        .scroll-top.show {
            opacity: 1;
        }

        .scroll-top:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
        }
/* --- Ajustes para la tarjeta del generador QR --- */
.tool-form {
  margin-top: 10px;
}

.tool-form input {
  width: 100%;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 6px;
  margin-bottom: 10px;
}

.qr-result {
  margin-top: 10px;
  text-align: center;
}

.qr-result img {
  width: 150px;
  height: 150px;
  margin-bottom: 8px;
}
/* ===========================
   Modal QR
   =========================== */

.modal {
  display: none;
  position: fixed;
  z-index: 999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  justify-content: center;
  align-items: center;
}

.modal-content {
  background: #fff;
  border-radius: 16px;
  padding: 2rem;
  width: 90%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.2);
  animation: modalFadeIn 0.3s ease;
}

.modal-content img {
  width: 200px;
  height: 200px;
  margin: 1rem 0;
}

.close-btn {
  position: absolute;
  top: 15px;
  right: 25px;
  font-size: 1.8rem;
  color: #555;
  cursor: pointer;
}

.close-btn:hover {
  color: #000;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}