body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #f9fafb;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2563eb;
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

nav a {
    text-decoration: none;
    color: #4b5563;
    font-weight: 500;
}

nav a:hover {
    color: #2563eb;
}

.hero {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #1e3a8a;
}

.hero p {
    font-size: 1.25rem;
    color: #374151;
    max-width: 600px;
    margin: 0 auto 30px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: #2563eb;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    transition: background 0.3s;
}

.btn:hover {
    background: #1d4ed8;
}

.features {
    padding: 60px 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.feature-card h3 {
    margin-top: 0;
    color: #1f2937;
}

footer {
    background: #1f2937;
    color: #fff;
    padding: 40px 0;
    text-align: center;
    margin-top: 60px;
}

.download-section {
    padding: 60px 0;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.download-item {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid #e5e7eb;
}

.seo-content {
    padding: 40px 0;
    background: #fff;
    border-radius: 12px;
    margin: 40px 0;
    padding: 40px;
}

.seo-content h2 {
    color: #111827;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    nav ul {
        display: none;
    }
}