body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background-image: url('html_bg.jpg');
    background-size: cover;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-color: rgba(0, 0, 0, 0.5);
    color: #333;
}
header {
    background-color: rgba(51, 51, 51, 0.9);
    color: #fff;
    padding: 15px 0;
    text-align: center;
}
nav {
    text-align: center;
    padding: 25px;
}
nav a {
    margin: 0 15px;
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}
nav a:hover {
    text-decoration: underline;
}
.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}
h1 {
    font-size: 40px;
    font-weight: bold;
    text-align: center;
}
footer {
    background-color: rgba(51, 51, 51, 0.9); /* 添加透明度 */
    color: #fff;
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    width: 100%;
}
.article {
    border: 1px solid #ccc;
    padding: 20px;
    margin: 10px 0;
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}
.al,.a1:link,.a1:active,.a1:hover,.a1:focus,.a1:visited{
    color: white;
    text-decoration: none;
}





/* 网络测试工具样式 */
.network-tools {
    max-width: 1200px;
    margin: 40px auto;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tool-card {
    background-color: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.tool-icon {
    font-size: 24px;
    margin-bottom: 10px;
}

.tool-version {
    display: inline-block;
    background-color: #f0f0f0;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 12px;
    margin: 10px 0;
}

.tool-link {
    display: inline-block;
    background-color: #4a90e2;
    color: white;
    padding: 5px 15px;
    border-radius: 3px;
    text-decoration: none;
    font-size: 14px;
}

.tool-link:hover {
    background-color: #3a7bc8;
}

@media (max-width: 768px) {
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }
}