a {
    text-decoration: none;
    }
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background: #f8f9fa;
    color: #333;
    min-height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
}

.container {
    width: 100%;
    max-width: 500px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    padding: 30px;
    position: relative;
    overflow: hidden;
}

.header {
    text-align: center;
    padding: 20px 0 30px;
    position: relative;
}

.logo {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #4a6cf7 0%, #8e54e9 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 2.5rem;
}

h1 {
    font-size: 2.2rem;
    color: #2c3e50;
    margin-bottom: 8px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1rem;
    color: #7f8c8d;
    font-weight: 400;
}

.network-alert {
    background: #f1f8ff;
    border-left: 4px solid #4a6cf7;
    border-radius: 4px;
    padding: 15px;
    margin: 0 0 25px;
    display: flex;
    gap: 12px;
    animation: fadeIn 0.8s ease;
}

.alert-icon {
    color: #4a6cf7;
    font-size: 1.4rem;
    min-width: 30px;
}

.alert-text {
    font-size: 0.95rem;
    color: #34495e;
}

.alert-text strong {
    color: #4a6cf7;
}

.nav-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 18px 20px;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid #edf2f7;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nav-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(74, 108, 247, 0.15);
    border-color: #dbe7ff;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: #4a6cf7;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-item:hover::before {
    opacity: 1;
}

.nav-icon {
    width: 45px;
    height: 45px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: white;
    margin-right: 15px;
    flex-shrink: 0;
}

.icon-copy { background: #4a6cf7; }
.icon-main { background: #10b981; }
.icon-telegram { background: #2aabee; }
.icon-backup { background: #f59e0b; }
.icon-app { background: #ef4444; }

.nav-content {
    flex-grow: 1;
}

.nav-title {
    font-size: 1.1rem;
    color: #2c3e50;
    font-weight: 600;
    margin-bottom: 4px;
}

.nav-desc {
    font-size: 0.95rem;
    color: #7f8c8d;
}

.copy-container {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 5px;
}

.domain-text {
    font-size: 0.95rem;
    background: #edf2f7;
    padding: 6px 12px;
    border-radius: 6px;
    font-family: monospace;
    color: #2d3748;
}

.copy-btn {
    background: #e0e7ff;
    color: #4a6cf7;
    border: none;
    border-radius: 6px;
    padding: 6px 12px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.copy-btn:hover {
    background: #d0d9ff;
}

.action-icon {
    font-size: 1.1rem;
    color: #4a6cf7;
    min-width: 30px;
    text-align: center;
}

.footer {
    margin-top: 30px;
    text-align: center;
    padding: 20px 0 10px;
    color: #7f8c8d;
    font-size: 0.9rem;
    border-top: 1px solid #edf2f7;
}

.success-message {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #10b981;
    color: white;
    padding: 12px 25px;
    border-radius: 50px;
    font-weight: 500;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 响应式设计 */
@media (max-width: 600px) {
    .container {
padding: 20px;
border-radius: 12px;
    }
    
    h1 {
font-size: 1.8rem;
    }
    
    .logo {
width: 70px;
height: 70px;
font-size: 2rem;
    }
    
    .nav-item {
padding: 15px;
    }
    
    .nav-icon {
width: 40px;
height: 40px;
font-size: 1.2rem;
    }
}

@media (max-width: 200px) {
    .nav-item {
flex-direction: column;
align-items: flex-start;
    }
    
    .nav-icon {
margin-right: 0;
margin-bottom: 12px;
    }
    
    .copy-container {
width: 100%;
justify-content: space-between;
    }
}