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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
}

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

/* Header */
header {
    padding: 20px 0;
    border-bottom: 1px solid #eee;
}

nav {
    display: flex;
    justify-content: flex-end;
}

.github-link {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border: 1px solid #ddd;
    border-radius: 6px;
    transition: all 0.2s;
}

.github-link:hover {
    background: #f6f8fa;
    border-color: #333;
}

/* Hero Section */
.hero {
    padding: 80px 0 60px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #000;
}

.subhead {
    font-size: 20px;
    color: #666;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
}

.btn-primary {
    background: #000;
    color: #fff;
}

.btn-primary:hover {
    background: #333;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #fff;
    color: #000;
    border: 1px solid #ddd;
}

.btn-secondary:hover {
    background: #f6f8fa;
    border-color: #333;
    transform: translateY(-2px);
}

/* Screenshot Section */
.screenshot-section {
    padding: 40px 0 80px;
    background: #f6f8fa;
}

.main-screenshot {
    width: 100%;
    max-width: 800px;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* Features Section */
.features {
    padding: 80px 0;
}

.features h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.feature h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #000;
}

.feature p {
    color: #666;
    line-height: 1.7;
}

/* How-to Section */
.how-to {
    padding: 80px 0;
    background: #f6f8fa;
}

.how-to h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
}

.step {
    margin-bottom: 40px;
}

.step h3 {
    font-size: 24px;
    margin-bottom: 12px;
    color: #000;
}

.step p {
    color: #666;
    line-height: 1.7;
    margin-bottom: 12px;
}

.step ol {
    margin-left: 20px;
    color: #666;
    line-height: 1.7;
}

.step ol li {
    margin-bottom: 8px;
}

.step code {
    background: #fff;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    color: #333;
    border: 1px solid #ddd;
}

.step a {
    color: #0070f3;
    text-decoration: none;
}

.step a:hover {
    text-decoration: underline;
}

/* Requirements Section */
.requirements {
    padding: 80px 0;
}

.requirements h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 30px;
}

.requirements ul {
    max-width: 600px;
    margin: 0 auto;
    list-style: none;
}

.requirements li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    color: #666;
    line-height: 1.7;
}

.requirements li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #0070f3;
    font-weight: bold;
}

/* Open Source Section */
.open-source {
    padding: 80px 0;
    background: #f6f8fa;
    text-align: center;
}

.open-source h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.open-source p {
    font-size: 18px;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}

.open-source a {
    color: #0070f3;
    text-decoration: none;
}

.open-source a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    padding: 40px 0;
    border-top: 1px solid #eee;
    text-align: center;
    color: #666;
}

footer p {
    margin-bottom: 10px;
}

footer a {
    color: #0070f3;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.disclaimer {
    font-size: 14px;
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 36px;
    }

    .subhead {
        font-size: 18px;
    }

    .features h2,
    .how-to h2,
    .requirements h2,
    .open-source h2 {
        font-size: 28px;
    }

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