/* Base styles */
:root {
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --text-color: #333;
    --heading-color: #2c3e50;
    --border-color: #eee;
    --bg-light: #f8f9fa;
    --spacing-unit: 20px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    margin: 0;
    color: var(--text-color);
}

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

.content-width {
    max-width: 800px;
    margin: 0 auto;
}

/* Header */
header {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 40px 0;
    text-align: center;
}

/* Navigation */
nav {
    background-color: var(--heading-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
}

nav a:hover {
    background-color: rgba(255,255,255,0.1);
    border-radius: 4px;
}

/* Sections */
.section {
    padding: 60px 0;
    border-bottom: 1px solid var(--border-color);
}

.section:nth-child(even) {
    background-color: var(--bg-light);
}

/* Typography */
h1, h2, h3 {
    color: var(--heading-color);
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
}

/* Components */
.button {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.button:hover {
    background-color: var(--primary-hover);
}

.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 20px;
    margin-bottom: 20px;
}

/* Features grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.feature-item {
    text-align: center;
    padding: 20px;
}

/* Downloads section */
.downloads-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
}

/* Documentation navigation */
.doc-nav {
    position: sticky;
    top: 80px;
}

/* Footer */
footer {
    background-color: var(--heading-color);
    color: white;
    padding: 40px 0;
    margin-top: 60px;
}

/* Responsive design */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .features-grid,
    .downloads-grid {
        grid-template-columns: 1fr;
    }
}

/* Utilities */
.text-center {
    text-align: center;
}

.mb-4 {
    margin-bottom: 2rem;
}

.mt-4 {
    margin-top: 2rem;
}

.version-tag {
    display: inline-block;
    padding: 4px 8px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 4px;
    font-size: 0.9rem;
}