.phone-nav {
    display: none;
}

.phone-nav {
    display: none;
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 98;
    color: white;
}

.phone-nav-content {
    display: none;
    position: fixed;
    top: 0px;
    left: 0px;
    width: 320px;
    height: 100%;
    background-color: #279767;
    padding: 20px;
    z-index: 99;
}

.header {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    background-color: #fff;
    box-sizing: border-box;
}

.header .header-main .header-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header .header-main .header-nav .header-nav-btn {
    flex: 1;
    display: flex;
    align-items: center;
}

.tab {
    width: 100%;
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

nav {
    width: 100%;
    max-width: 1400px;
    display: flex;
    align-items: center;
}
@media (max-width: 735px) {
    nav {
        display: none;
    }
}

nav .logo {
    position: absolute;
    top: 0;
    left: 20px;
}
nav .logo_word {
    display: inline-block;
    font-size: 1.5rem;
    gap: 10px;
    font-weight: bold;
    color: white;
}

nav .logo img {
    width: 100px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 10px 20px;
}

nav ul li {
    position: relative;
    white-space: nowrap;
}

nav li:hover .arrow-icon {
    transform: rotate(180deg); /* 上下颠倒 */
}

nav ul li a {
    text-decoration: none;
    color: #999;
    padding: 12px clamp(5px, 1vw, 10px);
    font-size: clamp(20px, 2.5vw, 25px);
}

nav ul li a:hover {
    /*opacity: 0.8;*/
    /*color: #279767;*/
}

nav ul li ul {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 130%;
    left: 10px;
    background: #fff;
    list-style: none;
    padding: 10px 0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    z-index: 99;
}
nav ul li ul li a {
    padding: 10px 20px;
    display: block;
    text-decoration: none;
    white-space: nowrap;
    font-size: 20px;
    color: #999;
}

nav ul li:hover ul {
    display: flex;
}
.arrow-icon {
    margin-left: 5px;
    width: 12px;
    height: 12px;
    transition: transform 0.3s ease; /* 平滑动画效果 */
    pointer-events: none;
    display: inline-block;
}
/*.open .arrow-icon {*/
/*    transform: rotate(180deg);*/
/*}*/
@media (max-width: 735px) {
    .header-nav-btn .arrow-icon {
        display: none;
    }
}

@media only screen and (min-width: 501px) {
    .occupy-box {
        width: 100%;
        height: 150px;
    }

    .header {
        height: 150px;
        border-bottom: 2px solid #D6D6D6;
    }

    .header .header-main {
        max-width: 1400px;
        margin: 0 auto;
    }

    .header .header-main .logo {
        margin-top: 10px;
        width: 150px;
    }

    .header .header-main .search-box {
        max-width: 1000px;
        margin: 10px auto;
        display: flex;
        align-items: center;
    }

    .header .header-main .search-box .search-tip {
        width:50%;
        font-size: 30px;
        line-height: 40px;
        font-weight: 700;
        color: #565656;
        text-align: center;
    }

    .header .header-main .search-box .input-box {
        width: 50%;
        position: relative;
    }

    .header .header-main .search-box .input-box .search-input {
        width: 100%;
        height: 40px;
        border: 1px solid #279767;
        border-radius: 15px;
        padding-left: 15px;
        box-sizing: border-box;
    }

    .header .header-main .search-box .input-box .search-icon {
        position: absolute;
        top: 50%;
        right: 10px;
        transform: translateY(-50%);
        font-size: 24px;
        color: #279767;
        cursor: pointer;
    }

    .header .header-main .btn-box {
        margin-top: 20px;
    }

    .header .header-main .btn-box a {
        margin-left: 0px;
        color: #999;
        font-size: 22px;
        line-height: 60px;
        text-align: center;
        padding: 15px;
    }

    .header .header-main .btn-box a:hover {
        color: #1c7430;
    }
}




@media only screen and (max-width: 735px) {
    .occupy-box{
        width: 100%;
        height:200px;
    }
    .header {
        padding-bottom: 20px;
        border-bottom: 2px solid #D6D6D6;
    }

    .header .header-main {
        position: relative;
        padding: 5px;
    }

    .header .header-main .logo {
        margin-top: 10px;
        width: 80px;
    }

    .header .header-main .search-box {
        margin: auto;
        text-align: center;
    }

    .header .header-main .search-box .search-tip {
        font-size: clamp(25px, 3vw, 30px);
        font-weight: 700;
        color: #565656;
        margin: 15px 0;
    }

    .header .header-main .search-box .input-box {
        position: relative;
    }

    .header .header-main .search-box .input-box .search-input {
        width: 95%;
        height: 50px;
        border: 1px solid #279767;
        border-radius: 15px;
        padding-left: 15px;
        box-sizing: border-box;
    }

    .header .header-main .search-box .input-box .search-icon {
        position: absolute;
        top: 50%;
        right: 10px;
        transform: translateY(-50%);
        font-size: 24px;
        color: #279767;
    }

    .header .header-main .btn-box {
        margin-top: 20px;
    }

    .header .header-main .btn-box a {
        margin-right: 10px;
    }


    .open-nav-btn {
        display: flex;
        flex-direction: column;
        justify-content: space-evenly;
        align-items: center;
        width: 40px;
        height: 50px;
        padding: 5px;
    }

    .open-nav-btn .btn-bar {
        width: 100%;
        height: 2px;
        background-color: black;
        cursor: pointer
    }

    .phone-nav-content .nav-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        height: 120px;
        /*margin-bottom: 60px;*/
    }

    .phone-nav-content .nav-header .close-nav {
        width: 30px;
        height: 30px;
        font-size: 40px;
        color: white;
        line-height: 30px;
        text-align: center;
        cursor: pointer
    }

    .phone-nav-content .nav-main {
        padding-left: 0px;
        list-style: none;
    }

    .phone-nav-content .nav-main li {
        padding: 10px 0;
    }

    .phone-nav-content .nav-main .nav-item {
        display: block;
        color: white;
        font-size: 22px;
        line-height: 30px;
        text-decoration: none;
    }
    .phone-nav-content .nav-main .sub {
        display: none;
    }
    .phone-nav-content .nav-main .open .sub {
        display: block;
    }
    .phone-nav-content .nav-main .sub .nav-item {
        font-size: 20px;
        padding-left: 20px;
    }

    .phone-nav-content .nav-line {
        height: 1px;
        background-color: #fff;
        margin: 30px 0;
    }

    .phone-nav-content .nav-button {
        width: 100%;
        border-radius: 50px;
        height: 50px;
        font-size: 22px;
        font-weight: bold;
        color: #279767;
        border: none;
        background-color: white;
    }
}