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

        :root {
            --primary-color: #10b981;
            --primary-dark: #059669;
            --primary-light: #34d399;
            --accent-color: #22c55e;
            --secondary-color: #86efac;
            --background: #ffffff;
            --surface: #f8fafc;
            --card-bg: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --border-color: #e2e8f0;
            --gradient: linear-gradient(135deg, var(--primary-color), var(--primary-light));
            --gradient-soft: linear-gradient(135deg, #ecfccb, #d9f99d);
            --shadow: 0 10px 30px rgba(16, 185, 129, 0.1);
            --shadow-hover: 0 20px 40px rgba(16, 185, 129, 0.15);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background-color: var(--background);
            color: var(--text-primary);
            overflow-x: hidden;
            line-height: 1.6;
        }

        /* Header */
        header {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            transition: all 0.3s ease;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 5%;
            max-width: 1400px;
            margin: 0 auto;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        .nav-links a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.3s ease;
            position: relative;
            font-weight: 500;
        }

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

        .nav-links .active {
            color: var(--primary-color);
            font-weight: 600;
        }

        .cta-button {
            background: var(--gradient);
            color: white;
            padding: 0.7rem 1.5rem;
            border-radius: 25px;
            text-decoration: none;
            transition: all 0.3s ease;
            box-shadow: var(--shadow);
            font-weight: 600;
        }

        .cta-button:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        /* Hero Section - Split Design */
        .hero {
            padding: 120px 5% 60px;
            min-height: 90vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 50%, #f0f9ff 100%);
        }

        .hero-container {
            max-width: 1400px;
            margin: 0 auto;
            width: 100%;
        }

        .hero-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .hero-header h1 {
            font-size: 3.5rem;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .hero-header h1 span {
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-header p {
            font-size: 1.3rem;
            color: var(--text-secondary);
        }

        .hero-split {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: stretch;
        }

        .hero-section {
            background: white;
            border-radius: 20px;
            padding: 3rem;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: var(--gradient);
        }

        .hero-section:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }

        .section-icon {
            width: 60px;
            height: 60px;
            background: var(--gradient-soft);
            border-radius: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            margin-bottom: 1.5rem;
        }

        .hero-section h2 {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .hero-section p {
            color: var(--text-secondary);
            margin-bottom: 2rem;
            font-size: 1.1rem;
        }

        .feature-list {
            list-style: none;
            margin-bottom: 2rem;
        }

        .feature-list li {
            padding: 0.5rem 0;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .feature-list li::before {
            content: '✓';
            color: var(--primary-color);
            font-weight: bold;
            font-size: 1.2rem;
        }

        .section-cta {
            display: inline-block;
            background: var(--gradient);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 25px;
            text-decoration: none;
            transition: all 0.3s ease;
            font-weight: 600;
        }

        .section-cta:hover {
            transform: translateX(5px);
            box-shadow: var(--shadow);
        }

        /* Stats Section */
        .stats {
            padding: 60px 5%;
            background: var(--surface);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .stat-card {
            text-align: center;
            padding: 2rem;
        }

        .stat-number {
            font-size: 3rem;
            font-weight: bold;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .stat-label {
            color: var(--text-secondary);
            margin-top: 0.5rem;
        }

        /* Recent Articles Section */
        .recent-articles {
            padding: 80px 5%;
            background: white;
        }

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

        .section-header h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .section-header h2 span {
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .article-card {
            background: var(--surface);
            border-radius: 15px;
            overflow: hidden;
            transition: all 0.3s ease;
            border: 1px solid var(--border-color);
        }

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

        .article-header {
            padding: 1.5rem;
            background: white;
        }

        .article-tag {
            display: inline-block;
            background: var(--gradient-soft);
            color: var(--primary-dark);
            padding: 0.3rem 0.8rem;
            border-radius: 15px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 0.8rem;
        }

        .article-card h3 {
            font-size: 1.3rem;
            margin-bottom: 0.5rem;
            color: var(--text-primary);
        }

        .article-meta {
            display: flex;
            gap: 1rem;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        /* Course Preview Section */
        .course-preview {
            padding: 80px 5%;
            background: var(--surface);
        }

        .courses-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .course-card {
            background: white;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
        }

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

        .course-image {
            height: 200px;
            background: var(--gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 3rem;
        }

        .course-content {
            padding: 1.5rem;
        }

        .course-level {
            display: inline-block;
            background: var(--gradient-soft);
            color: var(--primary-dark);
            padding: 0.3rem 0.8rem;
            border-radius: 15px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 0.8rem;
        }

        .course-card h3 {
            font-size: 1.3rem;
            margin-bottom: 0.5rem;
        }

        .course-info {
            display: flex;
            justify-content: space-between;
            margin-top: 1rem;
            padding-top: 1rem;
            border-top: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        /* CTA Section */
        .cta-section {
            padding: 80px 5%;
            background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
            color: white;
            text-align: center;
        }

        .cta-content h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .cta-content p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }

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

        .cta-white {
            background: white;
            color: var(--primary-color);
            padding: 1rem 2rem;
            border-radius: 25px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .cta-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }

        /* Footer */
        footer {
            background: var(--text-primary);
            color: white;
            padding: 60px 5% 30px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-section h3 {
            margin-bottom: 1rem;
        }

        .footer-section p {
            opacity: 0.8;
            line-height: 1.8;
        }

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

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

        .footer-links a {
            color: white;
            text-decoration: none;
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .footer-links a:hover {
            opacity: 1;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            opacity: 0.8;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }

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

            .hero-split {
                grid-template-columns: 1fr;
            }

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

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