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

body {
    font-family: 'Microsoft YaHei', 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: 10px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: bold;
}

input[type="text"] {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

.input-with-btn {
    display: flex;
    gap: 10px;
}

.input-with-btn input {
    flex: 1;
}

.btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

.btn:hover {
    background: #5a67d8;
}

.btn-secondary {
    background: #718096;
}

.btn-secondary:hover {
    background: #4a5568;
}

.result-container {
    margin-top: 20px;
    padding: 20px;
    background: #f7fafc;
    border-radius: 5px;
    border-left: 4px solid #667eea;
}

.result-title {
    color: #333;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sn-code {
    font-family: 'Courier New', monospace;
    background: #2d3748;
    color: #68d391;
    padding: 15px;
    border-radius: 5px;
    margin: 10px 0;
    font-size: 18px;
    word-break: break-all;
}

.copy-btn {
    background: #38b2ac;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

.copy-btn:hover {
    background: #319795;
}

.usage-instructions {
    background: #fff8e1;
    border: 1px solid #ffe082;
    border-radius: 5px;
    padding: 15px;
    margin-top: 30px;
}

.usage-instructions h3 {
    color: #f57c00;
    margin-bottom: 10px;
}

.usage-instructions ol {
    margin-left: 20px;
}

.usage-instructions li {
    margin-bottom: 8px;
}

.code-example {
    background: #f5f5f5;
    padding: 10px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    margin: 5px 0;
}

.current-info {
    margin-top: 20px;
    padding: 15px;
    background: #e3f2fd;
    border-radius: 5px;
}

.current-info p {
    margin: 5px 0;
}

.server-ip {
    color: #e53935;
    font-weight: bold;
}

.domain-variants {
    display: flex;
    gap: 10px;
    margin-top: 5px;
    flex-wrap: wrap;
}

.variant-item {
    background: #e8f5e9;
    border: 1px solid #81c784;
    border-radius: 3px;
    padding: 5px 10px;
    font-size: 13px;
}

.variant-key {
    font-weight: bold;
    color: #2e7d32;
}

.loading {
    text-align: center;
    padding: 20px;
    color: #666;
}