:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --text-color: #333;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --border-radius: 0.5rem;
    --spacing: 2rem;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}


h1,
h2,
h3 {
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
}

.navbar {
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 1rem var(--spacing);
    position: absolute;
    width: 100%;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

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

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 8rem var(--spacing) 4rem;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: 0.75rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: transform 0.3s ease;
}

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

/* Main content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing);
}

.section {
    margin: 4rem 0;
}

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

/* Quick links */
.quick-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.quick-link {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: background-color 0.3s ease;
}

.quick-link:hover {
    background: var(--primary-dark);
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing);
}

.card {
    background: var(--card-bg);
    padding: var(--spacing);
    border-radius: var(--border-radius);
    box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

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

.card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.topic-list {
    list-style: none;
    margin-top: 1rem;
}

.topic-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.topic-list li:last-child {
    border-bottom: none;
}

/* Examples */
.example-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing);
}

.example-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

.example-card:hover {
    transform: translateY(-5px);
}

.example-preview {
    background: var(--primary-color);
    color: white;
    padding: 3rem var(--spacing);
    text-align: center;
}

.example-info {
    padding: var(--spacing);
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 0.5rem 0;
    color: var(--text-color);
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    padding: var(--spacing);
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing);
}

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

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

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

.footer-section a {
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

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