/* platform.css - platform.html 页面样式 */

/* 隐藏式H1 - 仅SEO可见 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* help 页面卡片样式 - 参考 szweb.cn */
.help-block {
    margin-bottom: 30px;
}
.help-card {
    display: block;
    text-decoration: none !important;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    outline: none;
}
.help-card:focus {
    outline: none;
}
.help-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}
.help-imgbox {
    width: 100%;
    height: 220px;
    overflow: hidden;
    border-radius: 12px 12px 0 0;
}
.help-imgbox img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
    display: block;
}
.help-card:hover .help-imgbox img {
    transform: scale(1.05);
}
.help-card h4 {
    color: #333;
    font-size: 20px;
    font-weight: 600;
    padding: 35px 20px 20px;
    margin: 0;
    text-decoration: none !important;
    border-bottom: none !important;
}
.help-card:hover h4 {
    color: #259ad6;
    text-decoration: none !important;
    border-bottom: none !important;
}
.help-card p {
    color: #999;
    font-size: 14px;
    line-height: 1.6;
    padding: 0 20px 0;
    margin: 0;
    text-decoration: none !important;
    border-bottom: none !important;
}
.help-card:hover p {
    text-decoration: none !important;
}

/* 蓝色圆形箭头按钮 */
.help-card .card-arrow {
    position: relative;
    margin-top: 15px;
    margin-left: 20px;
    margin-bottom: 20px;
    width: 44px;
    height: 44px;
    background: #259ad6;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease, transform 0.3s ease;
}
.help-card .card-arrow i {
    color: #fff;
    font-size: 18px;
}
.help-card:hover .card-arrow {
    background: #1a7aa8;
}

/* 导航栏hover变粗+圆角背景 - 仅PC端 */
@media (min-width: 992px) {
    .main-menu > li > a {
        padding: 8px 16px !important;
        border-radius: 20px !important;
    }
    .main-menu > li > a:hover {
        font-weight: 900 !important;
        background-color: rgba(255,255,255,0.2) !important;
    }
    /* 导航项间距 */
    .main-menu > li {
        margin: 0 8px !important;
    }
    .main-menu > li {
        transform: none !important;
        transition: none !important;
    }
    .main-menu > li:hover {
        transform: none !important;
    }
    .main-menu > li a {
        transition: none !important;
        transform: none !important;
    }
    .main-menu .dropdown-menu li a:hover {
        font-weight: 900 !important;
    }
    .main-menu .dropdown-menu {
        border-radius: 12px !important;
        overflow: hidden;
    }

    /* 大卡片下拉菜单 - 仅PC端 */
    .has-mega-menu {
        position: relative;
    }
    .has-mega-menu .mega-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%);
        z-index: 9999;
        min-width: 510px;
        padding-top: 8px;
    }
    .has-mega-menu:hover .mega-menu {
        display: block;
    }
    .mega-menu-inner {
        display: flex;
        background: #fff;
        border-radius: 24px;
        overflow: hidden;
        box-shadow: 0 8px 32px rgba(0,0,0,0.12);
        padding: 24px 20px 24px 24px;
        gap: 24px;
        align-items: center;
    }
    .mega-menu-left {
        padding: 0;
        display: flex;
        flex-direction: column;
        gap: 6px;
        min-width: 140px;
    }
    .mega-menu-left.mega-col-2 {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 6px 16px;
        max-width: 320px;
    }
    .mega-menu-left.mega-col-2 a {
        width: auto;
    }
    .mega-menu-left a {
        color: #000 !important;
        font-size: 15px;
        padding: 10px 16px;
        border-radius: 10px;
        text-decoration: none !important;
        transition: background 0.2s, color 0.2s, font-weight 0.2s;
        white-space: nowrap;
    }
    .mega-menu-left a:hover {
        color: #259ad6 !important;
        font-weight: 700;
    }
    .mega-menu-right {
        flex: 0 0 auto;
        width: 200px;
        height: 250px;
        border-radius: 16px;
        overflow: hidden;
        margin-right: 4px;
        margin-left: 100px;
    }
    .mega-menu-right img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
        border-radius: 16px;
    }
} /* end PC-only media query */

/* 移动端导航覆盖 */
@media (max-width: 991px) {

    /* 覆盖 Bootstrap 默认的 hover/open 浅灰背景 */
    .nav > li > a:hover,
    .nav > li > a:focus,
    .nav .open > a,
    .nav .open > a:focus,
    .nav .open > a:hover {
        background: transparent !important;
        color: #259ad6 !important;
    }

    /* 一级菜单：无箭头、无分隔线 */
    .main-menu > li {
        margin: 0 !important;
        display: block !important;
        border-bottom: none !important;
    }
    .main-menu > li > a {
        display: block !important;
        position: relative !important;
        padding: 12px 16px !important;
        border-radius: 0 !important;
        color: #ffffff !important;
        font-size: 15px !important;
        font-weight: 400 !important;
        border-bottom: none !important;
        background: none !important;
        text-decoration: none !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
    }
    .main-menu > li > a:hover,
    .main-menu > li > a:active,
    .main-menu > li > a:focus {
        color: #259ad6 !important;
        background: transparent !important;
    }
    /* 去掉一级菜单箭头 */
    .main-menu > li > a::after {
        content: none !important;
    }
    .has-mega-menu.mobile-open > a::after {
        content: none !important;
        transform: none !important;
    }

    /* 搜索框隐藏 */
    .main-menu li.search {
        display: none !important;
        border-bottom: none !important;
    }

    /* 子菜单容器 */
    .has-mega-menu {
        position: static !important;
    }
    .has-mega-menu .mega-menu {
        display: none !important;
        position: static !important;
        transform: none !important;
        min-width: 100% !important;
        width: 100% !important;
        padding: 0 !important;
        box-shadow: none !important;
        background: transparent !important;
    }
    .has-mega-menu:hover .mega-menu {
        display: none !important;
    }
    .has-mega-menu.mobile-open .mega-menu {
        display: block !important;
    }
    .mega-menu-inner {
        display: flex !important;
        flex-direction: column !important;
        background: transparent !important;
        border-radius: 0 !important;
        box-shadow: none !important;
        padding: 0 !important;
        gap: 0 !important;
        margin: 0 !important;
    }
    .mega-menu-right {
        display: none !important;
    }
    .mega-menu-left {
        min-width: 100% !important;
        max-width: 100% !important;
        flex-direction: column !important;
        gap: 0 !important;
        padding: 0 !important;
    }
    .mega-menu-left.mega-col-2 {
        display: flex !important;
        flex-direction: column !important;
        grid-template-columns: none !important;
        gap: 0 !important;
    }

    /* 二级菜单：无箭头、无分隔线 */
    .mega-menu-left a {
        display: block !important;
        position: relative !important;
        color: #ffffff !important;
        font-size: 14px !important;
        font-weight: 400 !important;
        padding: 10px 16px 10px 28px !important;
        border-radius: 0 !important;
        border-left: none !important;
        border-bottom: none !important;
        text-decoration: none !important;
        background: none !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
    }
    .mega-menu-left a::after {
        content: none !important;
    }
    .mega-menu-left a:hover,
    .mega-menu-left a:active {
        color: #259ad6 !important;
        background: transparent !important;
    }
} /* end mobile override */