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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #FFFFFF;
    color: #303948;
    line-height: 1.7;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
    border-bottom: 2px solid #3cbef2;
    padding-bottom: 20px;
}

.logo-section {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.logo {
    border: 1px solid #ddd;
    padding: 5px;
}

.gif-banner {
    border-radius: 5px;
}

.main-nav {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.main-nav a {
    text-decoration: none;
    color: #303948;
    font-weight: 600;
    padding: 12px 18px;
    border-radius: 3px;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.main-nav a:hover {
    background-color: #3cbef2;
    color: #FFFFFF;
}

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

.hero h1 {
    color: #303948;
    font-size: 2.8rem;
    margin-bottom: 15px;
    line-height: 1.3;
}

.subtitle {
    color: #3cbef2;
    font-size: 1.3rem;
    margin-bottom: 40px;
    font-weight: 500;
}

.mirrors-section {
    background-color: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
    margin-top: 40px;
}

.mirrors-section h2 {
    color: #303948;
    margin-bottom: 20px;
    font-size: 2rem;
}

.warning {
    color: #e74c3c;
    font-weight: 600;
    margin-bottom: 25px;
    font-size: 1.1rem;
}

.links-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 40px;
}

.mirror-link {
    display: block;
    padding: 18px;
    background-color: #3cbef2;
    color: #FFFFFF;
    text-decoration: none;
    border-radius: 6px;
    font-family: monospace;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    word-break: break-all;
    text-align: center;
}

.mirror-link:hover {
    background-color: #303948;
    transform: translateY(-2px);
}

.error {
    color: #e74c3c;
    padding: 20px;
    background-color: #fadbd8;
    border-radius: 6px;
    text-align: center;
}

.pgp-verification {
    text-align: left;
    background-color: #ffffff;
    padding: 25px;
    border-radius: 6px;
    border: 1px solid #ddd;
}

.pgp-verification h3 {
    margin-bottom: 15px;
    color: #303948;
}

.pgp-key {
    width: 100%;
    height: 140px;
    background-color: #f1f1f1;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 15px;
    font-family: monospace;
    font-size: 0.95rem;
    resize: none;
    margin-bottom: 15px;
    line-height: 1.5;
}

.content-section {
    margin-bottom: 60px;
    padding: 40px;
    background-color: #f8f9fa;
    border-radius: 10px;
}

.content-section h2 {
    color: #303948;
    font-size: 2.2rem;
    margin-bottom: 30px;
    border-bottom: 2px solid #3cbef2;
    padding-bottom: 10px;
}

.text-content h3 {
    color: #3cbef2;
    margin: 25px 0 15px 0;
    font-size: 1.5rem;
}

.text-content h4 {
    color: #303948;
    margin: 20px 0 12px 0;
    font-size: 1.2rem;
}

.text-content p {
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.preview-section {
    margin-bottom: 60px;
}

.preview-section h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #303948;
    font-size: 2.2rem;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.preview-item {
    text-align: center;
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.preview-item:hover {
    transform: translateY(-5px);
}

.preview-item img {
    width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 15px;
}

.preview-item p {
    font-size: 1rem;
    color: #666;
    line-height: 1.5;
}

.info-section {
    margin-bottom: 60px;
}

.info-section h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #303948;
    font-size: 2.2rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.info-card {
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 8px;
    border-left: 4px solid #3cbef2;
    transition: all 0.3s ease;
}

.info-card:hover {
    background-color: #e9ecef;
}

.info-card h3 {
    margin-bottom: 15px;
    color: #303948;
    font-size: 1.3rem;
}

.info-card p {
    color: #666;
    line-height: 1.6;
}

.security-notice {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 10px;
    padding: 40px;
    margin-bottom: 50px;
}

.security-notice h2 {
    color: #856404;
    margin-bottom: 25px;
    font-size: 2rem;
}

.security-content ul {
    list-style-position: outside;
    margin-left: 20px;
    margin-bottom: 20px;
}

.security-content li {
    margin-bottom: 12px;
    color: #856404;
    font-size: 1.1rem;
}

.security-content p {
    color: #856404;
    font-style: italic;
}

.update-section {
    margin-bottom: 50px;
    padding: 40px;
    background-color: #f8f9fa;
    border-radius: 10px;
}

.update-section h2 {
    color: #303948;
    margin-bottom: 30px;
    font-size: 2.2rem;
}

.update-item {
    margin-bottom: 25px;
    padding-bottom: 25px;
    border-bottom: 1px solid #ddd;
}

.update-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.update-item h3 {
    color: #3cbef2;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.update-item p {
    color: #666;
    line-height: 1.6;
}

footer {
    text-align: center;
    padding-top: 40px;
    border-top: 2px solid #3cbef2;
    color: #666;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-links {
    margin: 15px 0;
    font-size: 0.9rem;
}

.disclaimer {
    font-size: 0.8rem;
    margin-top: 20px;
    color: #999;
    font-style: italic;
}

@media (max-width: 768px) {
    .logo-section {
        flex-direction: column;
    }
    
    .main-nav {
        flex-direction: column;
        gap: 10px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .preview-grid {
        grid-template-columns: 1fr;
    }
    
    .content-section {
        padding: 25px;
    }
    
    .mirrors-section {
        padding: 25px;
    }
}