/* 顶部导航 */
.top-bar {
    background-color: #fff;
    border-bottom: 1px solid #eee;
    font-size: 12px;
    color: #666;
}

.top-bar a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s;
}

.top-bar a:hover {
    color: #0d6efd;
}

/* 头部区域 */
.header-main {
    background-color: #fff;
    padding: 25px 0;
}

.site-title {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin: 0;
    line-height: 1;
    white-space: nowrap;
}

.header-search .input-group {
    max-width: 600px;
    width: 100%;
}

.header-search .form-control {
    border: 1px solid #0d6efd;
    border-right: none;
    border-radius: 0;
    height: 44px;
    font-size: 14px;
}

.header-search .btn {
    background-color: #0d6efd;
    border: 1px solid #0d6efd;
    border-radius: 0;
    color: #fff;
    padding: 0 28px;
    font-size: 15px;
}

.header-search .btn:hover {
    background-color: #0b5ed7;
    border-color: #0b5ed7;
}

@media (max-width: 768px) {
    .header-main .header-row {
        flex-direction: column;
        gap: 15px;
    }

    .site-title {
        text-align: left;
        width: 100%;
        position: relative;
    }
}