/* Modern CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --background-color: #F5F5F7;
    --text-color: #1D1D1F;
    --nav-bg: #FFFFFF;
    --card-bg: #FFFFFF;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Navigation */
.navbar {
    background-color: var(--nav-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-item {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-item:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Main Content */
.content {
    margin-top: 90px;
    padding: 40px 20px;
}

h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.module-intro {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.module-intro:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.module-intro p {
    margin-bottom: 20px;
    color: #666;
}

.module-intro ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.module-intro ul li a {
    display: block;
    padding: 15px 20px;
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.module-intro ul li a:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateX(10px);
}

/* Code Blocks */
.code-block {
    background-color: #1E1E1E;
    border-radius: var(--border-radius);
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
}

.code-block pre {
    color: #D4D4D4;
    font-family: 'Fira Code', monospace;
    font-size: 14px;
    line-height: 1.5;
}

/* Footer */
.footer {
    background-color: var(--nav-bg);
    padding: 30px 0;
    margin-top: 60px;
    text-align: center;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    h1 {
        font-size: 36px;
    }
    
    .module-intro {
        padding: 20px;
    }
    
    .module-intro ul {
        grid-template-columns: 1fr;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.module-intro {
    animation: fadeIn 0.5s ease-out;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}