/* ========================================= */
/* 一、导航菜单样式（PC + 移动端） */
/* ========================================= */
.navbar-nav > li > a,
.site-header .navbar-nav > li > a,
.navigation-menu > li > a,
.nav > li > a {
    font-size: 16px !important;
    font-weight: normal !important;
    padding: 0 12px !important;
    line-height: 60px !important;
}

.navbar-nav > li > a:hover,
.site-header .navbar-nav > li > a:hover {
    color: var(--key-color) !important;
}

@media (max-width: 768px) {
    .navbar-collapse .navbar-nav > li > a,
    .mobile-menu > li > a {
        font-size: 15px !important;
        line-height: 50px !important;
        padding: 0 15px !important;
    }
}

@media (min-width: 1200px) {
    .navbar-nav > li > a {
        font-size: 17px !important;
    }
}
@media (min-width: 992px) and (max-width: 1199px) {
    .navbar-nav > li > a {
        font-size: 15px !important;
        padding: 0 10px !important;
    }
}
@media (min-width: 768px) and (max-width: 991px) {
    .navbar-nav > li > a {
        font-size: 14px !important;
        padding: 0 8px !important;
    }
}

.navbar-nav > .active > a,
.navbar-nav > li.active > a {
    font-weight: bold !important;
    color: var(--key-color) !important;
    position: relative !important;
}

.navbar-nav > li {
    margin: 0 2px !important;
}

/* ========================================= */
/* 二、顶部Logo尺寸控制（PC + 移动端） */
/* ========================================= */
.site-header .navbar-brand,
.site-header .logo,
.site-header .logo a,
.navbar .navbar-brand,
.navbar-brand {
    padding: 5px 0 !important;
}

.site-header .navbar-brand img,
.site-header .logo img,
.navbar-brand img,
.navbar .logo img {
    max-width: 250px !important;
    max-height: 45px !important;
    width: auto !important;
    height: auto !important;
    object-fit: contain !important;
    vertical-align: middle !important;
}

@media (max-width: 768px) {
    .site-header .navbar-brand,
    .site-header .logo,
    .navbar .navbar-brand,
    .navbar-brand {
        padding: 3px 0 !important;
    }
    .site-header .navbar-brand img,
    .site-header .logo img,
    .navbar-brand img,
    .navbar .logo img {
        max-width: 140px !important;
        max-height: 45px !important;
    }
}

放置在后台 自定义CSS 中

附: 按键布局CSS

<span 
  style="
    display: inline;
    color: #ffffff;
    font-weight: 700;
    font-size: 1.1em;
    background: #e67022;
    padding: 0.3em 0.8em;
    border-radius: 0.6em;
    transition: all 0.3s ease;
    cursor: pointer;
    text-shadow: 1px 1px 3px #000000;
    box-shadow: none;
  "
  onmouseover="
    this.style.background='#c95f1a';
    this.style.transform='translateY(-2px)';
    this.style.boxShadow='0 6px 15px rgba(0,0,0,0.15)';
  "
  onmouseout="
    this.style.background='#e67022';
    this.style.transform='translateY(0)';
    this.style.boxShadow='none';
  "
>服务</span>