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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
}

.header-nav {
    margin-top: 15px;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.1);
    transition: background 0.2s;
    display: inline-block;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.2);
}

main {
    padding: 30px;
}

.server-tree {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
}

.channel {
    margin-bottom: 15px;
    background: white;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    overflow: hidden;
}

.channel-header {
    padding: 12px 15px;
    background: #f1f3f5;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.channel-icon {
    font-size: 1.2rem;
}

.channel-name {
    color: #2c3e50;
}

.clients {
    padding: 10px 15px 10px 35px;
}

.client {
    padding: 8px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-radius: 6px;
    transition: background 0.2s;
}

.client:hover {
    background: #f8f9fa;
}

.client-icon {
    font-size: 1rem;
    color: #667eea;
}

.client-name {
    flex: 1;
    color: #495057;
}

.client-status {
    font-size: 1rem;
    display: flex;
    gap: 4px;
}

.children {
    padding: 0 15px 15px 35px;
}

.children .channel {
    border-left-color: #764ba2;
}

footer {
    background: #f8f9fa;
    padding: 20px;
    text-align: center;
    color: #6c757d;
    font-size: 0.9rem;
    border-top: 1px solid #e9ecef;
}

/* Error page styles */
.error-container {
    text-align: center;
    padding: 40px 20px;
}

.error-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.error-title {
    color: #e74c3c;
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.error-message {
    color: #495057;
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.error-details {
    background: #f8f9fa;
    border-left: 4px solid #e74c3c;
    padding: 15px 20px;
    margin: 20px auto;
    max-width: 600px;
    text-align: left;
    border-radius: 4px;
}

.error-details p {
    color: #6c757d;
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
    word-wrap: break-word;
}

.error-actions {
    margin-top: 30px;
}

.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

/* Responsive design */
@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    main {
        padding: 20px;
    }
    
    .children {
        padding-left: 20px;
    }
    
    .error-icon {
        font-size: 3rem;
    }
    
    .error-title {
        font-size: 1.4rem;
    }
    
    .error-message {
        font-size: 1rem;
    }
}