/* 基础样式 */
*{
    margin: 0;
    padding: 0;
}
body {
    margin: 0;
    font-family: Arial, sans-serif;
}

li {
    list-style-type: none;
}

a {
    text-decoration: none;
    color: inherit;
}

.navbar_box {
    position: static;
    background-color: transparent;
    /* 背景透明 */
    position: fixed;
    width: 100%;
    height: auto;
    top: 0;
    z-index: 999;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    position: relative;
}

.logo {
    display: block;
    color: white;
    font-weight: bold;
    max-width: 80px;
}

.logo img {
    width: 100%;
    height: auto;
    object-fit: contain;
}

.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 20px;
    height: 1px;
    background-color: white;
    margin: 2px 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.erji_nav {
    display: none;
    /* 默认隐藏 */
    list-style: none;
    padding-left: 20px;
}

.toggle-icon {
    display: none;
}
#toggle-icon{
    display: block;
}
.first_ul li:hover >a{
    color: rgb(215, 165, 37);
}

/* 响应式设计 */
@media (max-width: 768px) {

    .scrolled{
        background-color: rgba(0, 0, 0, 0.4);
        position: fixed;
        top: 0;
        z-index: 9999;
    }
    .footer{
        display: none !important;
    }
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: #333;
        flex-direction: column;
        transform: translateY(100%);
        transition: transform 0.5s ease;
        z-index: 10;
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .hamburger {
        display: flex;
        z-index: 20;
        padding: 12px 8px;
        background-color: rgb(71, 69, 68);
        border-radius: 5px;
    }

    /* 汉堡菜单动画 */
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(4px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }

    .first_ul {
        width: 90%;
        height: auto;
        margin: 0 auto;
        padding: 20px 0;
        margin: 0 auto;
        margin-top: 50px;
    }

    .first_ul li {
        color: white;
        height: auto;
        width: 100%;
        padding: 10px 0;
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
    }

    .first_ul>li {
        font-size: 18px;
    }

    .first_ul li img {
        width: 20px;
        height: auto;
        object-fit: contain;
    }

    .erji_nav {
        width: 100%;
        height: auto;
        padding-left: 1rem;
    }

    .erji_nav li {
        font-size: 14px;
    }

    .toggle-icon {
        display: block;
        transform: rotate(180deg);
        transition: transform 0.3s ease;
        /* 向下图标旋转效果 */
    }

    .rotate {
        transform: rotate(0deg);
        /* 向下图标旋转180度 */
    }
}

@media (min-width: 768px) {
    .scrolled{
        background-color: rgba(0, 0, 0, 0.4);
        position: fixed;
        top: 0;
        z-index: 9999;
    }
    .navbar {
        width: 75%;
        margin: 0 auto;
        padding: 0;
    }

    .nav-links {
        width: 65%;
        height: auto;
    }

    .first_ul {
        width: 100%;
        height: auto;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0;
        margin: 0;
        position: relative;
    }
    #yuyan{
        display: flex
    }
    #yuyan img{
        max-width: 21px;
        padding: 0 3px;
    }
    .first_ul >li {
        color: white;
        font-size: 16px;
        min-height: 75px;
        padding: 24px 5px;
    }
    .first_ul >li > a{
        padding: 10px 0;
    }
    .logo {
        max-width: 90px;
    }

    .parent {
        position: relative;
    }

    .erji_nav {
        position: absolute;
        top: 75px;
        left: 50%;
        transform: translate(-50%, 0);
        width: max-content;
        padding: 0 15px;
    }
    .black{
        background-color: rgba(0, 0, 0, 0.4);
    }
    .erji_nav li{
        padding: 4px 0;
    }
    .erji_nav li >a {
        font-size: 14px;
    }
    .parent:hover .erji_nav {
        display: block;
    }
    .navbar_box{
        min-height: 75px;
    }
}