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

:root {
    --primary-color: #0066cc;
    --primary-dark: #0052a3;
    --secondary-color: #00a8e8;
    --text-color: #333333;
    --text-light: #666666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --success-color: #28a745;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 60px;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

h1 {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.download-section {
    background: var(--bg-color);
    border-radius: 16px;
    padding: 50px;
    box-shadow: var(--shadow);
    margin-bottom: 40px;
}

.detected-platform {
    text-align: center;
    margin-bottom: 30px;
}

.platform-badge {
    display: inline-block;
    background: linear-gradient(135deg, #6c757d, #5a6268);
    color: white;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.primary-download {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-bottom: 40px;
    width: 100%;
}

.download-btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 18px 50px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    border: none;
    cursor: pointer;
    text-align: center;
    margin: 0 auto;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.download-btn:active {
    transform: translateY(0);
}

.download-info {
    margin-top: 15px;
    color: var(--text-light);
    font-size: 0.9rem;
    text-align: center;
}

.other-versions {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 2px solid var(--border-color);
}

.other-versions h2 {
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: var(--text-color);
    text-align: center;
}

.versions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.version-card {
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.version-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.version-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.version-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 10px;
}

.version-desc {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 15px;
    flex: 1;
}

.version-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 20px;
    border: 2px solid var(--primary-color);
    border-radius: 25px;
    transition: all 0.3s ease;
    margin-top: auto;
    align-self: center;
}

.version-link:hover {
    background: var(--primary-color);
    color: white;
}

footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px 20px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.loading {
    opacity: 0.6;
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }

    .download-section {
        padding: 30px 20px;
    }

    .logo {
        font-size: 2rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .download-btn {
        padding: 15px 40px;
        font-size: 1rem;
    }

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