* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}
body {
    background: #121a29;
    color: #e0e0e0;
    line-height: 1.7;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}
.header {
    padding: 25px 0;
    border-bottom: 1px solid #2a3548;
    margin-bottom: 30px;
}
.header h1 {
    color: #f0f0f0;
    font-size: 26px;
}
.header p {
    color: #9aa3b3;
    margin-top: 5px;
    font-size: 14px;
}
.cat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}
.cat-item {
    background: #182236;
    border-radius: 10px;
    padding: 25px;
    border: 1px solid #253247;
    transition: 0.3s;
}
.cat-item:hover {
    transform: translateY(-3px);
    border-color: #9b2c2c;
}
.cat-item h3 {
    color: #f0f0f0;
    font-size: 18px;
    margin-bottom: 10px;
}
.cat-item p {
    color: #9aa3b3;
    font-size: 14px;
    margin-bottom: 15px;
}
.btn {
    display: inline-block;
    background: #9b2c2c;
    color: #fff;
    padding: 10px 18px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
}
.btn:hover {
    background: #b83232;
}
.article-item {
    background: #182236;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    border: 1px solid #253247;
}
.article-item h3 {
    color: #f0f0f0;
    font-size: 16px;
    margin-bottom: 8px;
}
.article-item p {
    color: #9aa3b3;
    font-size: 14px;
    margin-bottom: 12px;
}
.read-box {
    background: #182236;
    border-radius: 10px;
    padding: 30px;
    margin: 20px 0;
}
.read-box h2 {
    color: #f0f0f0;
    font-size: 22px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #2a3548;
}
.content {
    font-size: 15px;
    color: #c9d1d9;
    line-height: 1.9;
}
.lock-tip {
    background: rgba(155,44,44,0.1);
    border-left: 3px solid #9b2c2c;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    margin: 30px 0;
}
.back {
    color: #9b2c2c;
    text-decoration: none;
    display: inline-block;
    margin: 20px 0;
}
.footer {
    text-align: center;
    color: #778498;
    padding: 30px 0;
    border-top: 1px solid #2a3548;
    margin-top: 40px;
    font-size: 13px;
}