/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #dee2e6;
    --code-bg: #f4f4f4;
    --code-border: #ddd;
    --link-color: #3498db;
    --link-hover: #2980b9;
}

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

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

/* Header */
header {
    text-align: center;
    padding: 3rem 0 2rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
}

header h1 {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1.25rem;
    color: #666;
    font-weight: 300;
}

/* Navigation */
.main-nav {
    margin-bottom: 3rem;
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 100;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.2s, color 0.2s;
}

.main-nav a:hover {
    background-color: var(--bg-light);
    color: var(--secondary-color);
}

/* Sections */
.section {
    margin-bottom: 4rem;
    scroll-margin-top: 100px;
}

.section h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.section h3 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.section h4 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.section p {
    margin-bottom: 1rem;
    text-align: justify;
}

.section ul, .section ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

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

.section ul ul {
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Code Blocks */
.code-block {
    background-color: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 4px;
    padding: 1rem;
    margin: 1.5rem 0;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.code-block code {
    font-family: 'Courier New', Courier, monospace;
}

.section code {
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: 'Courier New', Courier, monospace;
}

/* Links */
a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* FAQs */
.faq-item {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-left: 4px solid var(--secondary-color);
    border-radius: 4px;
}

.faq-item h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.faq-item p {
    margin-bottom: 0.75rem;
}

.faq-item ul {
    margin-top: 0.5rem;
}

/* Demos */
.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.demo-item {
    background-color: var(--bg-light);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.demo-item h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.25rem;
}

.video-placeholder {
    background-color: var(--code-bg);
    border: 2px dashed var(--border-color);
    border-radius: 4px;
    padding: 3rem 2rem;
    text-align: center;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.video-placeholder p {
    margin-bottom: 0.5rem;
    color: #666;
    font-weight: 500;
}

.video-description {
    font-size: 0.9rem;
    color: #999;
    font-weight: normal;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 4px;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.demo-instructions {
    margin-top: 3rem;
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: 4px;
}

.demo-instructions h3 {
    margin-top: 0;
}

/* Footer */
footer {
    margin-top: 4rem;
    padding: 2rem 0;
    border-top: 2px solid var(--border-color);
    text-align: center;
    color: #666;
}

footer p {
    margin-bottom: 0.5rem;
}

footer a {
    margin: 0 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }

    .section h2 {
        font-size: 2rem;
    }

    .section h3 {
        font-size: 1.5rem;
    }

    .demo-grid {
        grid-template-columns: 1fr;
    }

    .code-block {
        font-size: 0.85rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}