html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei", -apple-system, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    flex-direction: column;
}

header {
    padding: 20px 40px;
    text-align: left;
}

header h1 {
    font-size: 24px;
    color: #333;
    margin: 0;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.content-box {
    background-color: #ffffff;
    border: 1px solid #dcdfe6;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    width: 100%;
    max-width: 400px;
    padding: 40px;
    min-height: 200px;
    box-sizing: border-box;
    margin-bottom: 20px;
}

.inner-text {
    color: #606266;
    line-height: 1.6;
    font-size: 14px;
    text-align: center;
}

.vpn-tip {
    margin-top: 10px;
    color: #909399;
    font-style: italic;
}

.ip-info {
    font-size: 12px;
    color: #909399;
    background: rgba(255, 255, 255, 0.5);
    padding: 5px 15px;
    border-radius: 20px;
    border: 1px solid #e4e7ed;
}

footer {
    min-height: 80px;
    border-top: 1px solid #e4e7ed;
    background-color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    color: #909399;
    font-size: 12px;
    padding: 10px 40px;
}

.copyright {
    text-align: left;
    margin-bottom: 4px;
}