body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #f1f5f9;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    border: 1px solid #3b82f6;
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    text-align: center;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    color: #60a5fa;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.3rem;
    color: #cbd5e1;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(45deg, #3b82f6, #1d4ed8);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    margin: 0 0.5rem;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.module-card {
    background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
    border: 1px solid #4b5563;
    border-radius: 15px;
    padding: 2.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6, #ec4899);
}

.module-card:hover {
    border-color: #3b82f6;
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
}

.module-card h3 {
    color: #60a5fa;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.module-meta {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    font-size: 0.9rem;
}

.difficulty {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-weight: 500;
}

.difficulty.foundation { background: #065f46; color: #10b981; }
.difficulty.intermediate { background: #1e40af; color: #3b82f6; }
.difficulty.advanced { background: #7c2d12; color: #f97316; }

.duration {
    color: #9ca3af;
    padding: 0.4rem 0;
}

.module-link {
    display: inline-block;
    margin-top: 1.5rem;
    padding: 0.8rem 1.5rem;
    background: #3b82f6;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-weight: 500;
}

.module-link:hover {
    background: #2563eb;
    transform: translateX(5px);
}

.coming-soon {
    opacity: 0.6;
    pointer-events: none;
}

.coming-soon .module-link {
    background: #6b7280;
    cursor: not-allowed;
}

.features {
    margin: 3rem 0;
    text-align: center;
}

.features h2 {
    color: #60a5fa;
    font-size: 2rem;
    margin-bottom: 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature {
    background: rgba(59, 130, 246, 0.1);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.feature h4 {
    color: #60a5fa;
    margin-bottom: 0.5rem;
}

.feature p {
    margin-bottom: 1.5rem;
}

.feature-button {
    display: inline-block;
    background: linear-gradient(45deg, #10b981, #059669);
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(16, 185, 129, 0.3);
}

.feature-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(16, 185, 129, 0.5);
    color: white;
    text-decoration: none;
}

.footer {
    margin-top: 4rem;
    text-align: center;
    color: #9ca3af;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .container {
        padding: 1rem;
    }
}