:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-color);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 3rem 2rem;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.25rem;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
}

section {
    padding: 3rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

section:last-of-type {
    border-bottom: none;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.features ul {
    list-style: none;
    display: grid;
    gap: 1rem;
}

.features li {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.features strong {
    color: var(--primary-color);
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.download-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.download-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.os-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.download-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.download-btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: background 0.3s ease;
}

.download-btn:hover {
    background: var(--primary-hover);
}

.code-block {
    background: #1e293b;
    border-radius: 12px;
    padding: 1.5rem;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
}

.code-block code {
    color: #e2e8f0;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.8;
}

.link-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: all 0.3s ease;
}

.link-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateX(4px);
}

.link-icon {
    font-size: 1.5rem;
}

footer {
    background: var(--bg-secondary);
    text-align: center;
    padding: 2rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

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

    .tagline {
        font-size: 1rem;
    }

    section {
        padding: 2rem 1.5rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .download-cards {
        grid-template-columns: 1fr;
    }
}