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

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

header {
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav h1 {
    color: #007AFF;
}

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

nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

nav a:hover {
    color: #007AFF;
}

main {
    margin-top: 80px;
}

.hero {
    display: flex;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 1rem;
    gap: 3rem;
}

.hero-content {
    flex: 1;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #1d1d1f;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #666;
}

.cta-button {
    background: #007AFF;
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: background 0.3s;
}

.cta-button:hover {
    background: #0056CC;
}

.hero-image {
    flex: 1;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.features {
    background: #f5f5f7;
    padding: 4rem 1rem;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.feature h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.download {
    text-align: center;
    padding: 4rem 1rem;
}

.download h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.download-button {
    background: #34C759;
    color: white;
    padding: 1.5rem 3rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.2rem;
    display: inline-block;
    margin: 2rem 0;
    transition: background 0.3s;
}

.download-button:hover {
    background: #28A745;
}

.disclaimer {
    color: #666;
    font-style: italic;
}

.github-link {
    margin-top: 1rem;
}

.github-link a {
    color: #007AFF;
    text-decoration: none;
    font-weight: 500;
}

.github-link a:hover {
    text-decoration: underline;
}

.installation-guide {
    max-width: 800px;
    margin: 3rem auto 0;
    padding: 2rem;
    background: #f5f5f7;
    border-radius: 12px;
    text-align: left;
}

.installation-guide h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #1d1d1f;
}

.installation-guide > p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #555;
}

.steps {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    margin-top: 1.5rem;
}

.steps h4 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    color: #007AFF;
}

.steps h4:first-child {
    margin-top: 0;
}

.steps ol {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.steps li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.steps ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
}

.steps ul li {
    margin-bottom: 0.5rem;
}

.safety-note {
    background: #e8f5e9;
    border-left: 4px solid #34C759;
    padding: 1rem;
    margin-top: 1.5rem;
    border-radius: 4px;
}

.safety-note strong {
    color: #1d7a2e;
}

.support {
    background: #f5f5f7;
    text-align: center;
    padding: 3rem 1rem;
}

footer {
    background: #1d1d1f;
    color: white;
    text-align: center;
    padding: 2rem;
}

footer a {
    color: #007AFF;
}

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    nav {
        flex-direction: column;
        gap: 1rem;
    }
}