/* ========================================
   头部和底部共用样式 - header-footer.css
   可被所有二级页面引用
   ======================================== */

/* ========================================
   顶部导航栏样式
   ======================================== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 3%;
    background: transparent;
    /* max-width: 100vw; */
    /* transition: var(--transition-normal); */
    background-color: rgba(0, 0, 0, 0.1);
}


/* 导航栏滚动后状态 - 白色背景，黑色字体 */
.top-nav.scrolled {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.top-nav.scrolled .nav-menu>li>a {
    color: var(--text-color);
}

.top-nav.scrolled .nav-menu>li>a.active,
.top-nav.scrolled .nav-menu>li:hover>a:not(.active) {
    color: var(--primary-color);
}

.top-nav.scrolled .lang-switch {
    color: var(--white);
}

/* 二级页面导航 - 初始透明，滚动后变白色背景 */
.top-nav.secondary-nav {
    background: transparent;
}

.top-nav.secondary-nav .nav-menu>li>a {
    color: var(--white);
}

.top-nav.secondary-nav .nav-menu>li>a.active {
    color: var(--primary-color);
}

.top-nav.secondary-nav .lang-switch {
    color: var(--white);
}

/* 二级页面滚动后状态 */
.top-nav.secondary-nav.scrolled {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.top-nav.secondary-nav.scrolled .nav-menu>li>a {
    color: var(--text-color);
}

.top-nav.secondary-nav.scrolled .nav-menu>li>a.active {
    color: var(--primary-color);
}

.top-nav.secondary-nav.scrolled .nav-menu>li:hover>a {
    color: var(--primary-color);
}

.top-nav.secondary-nav.scrolled .lang-switch {
    color: var(--white);
}

/* Logo 样式 */
.logo {
    flex-shrink: 0;
}

.logo img {
    max-width: clamp(140px, 18vw, 300px);
    height: auto;
}
/* Logo 滚动状态切换（纯 CSS） */
.logo-img.logo-scrolled { display: none; }
.top-nav.scrolled .logo-img.logo-default { display: none; }
.top-nav.scrolled .logo-img.logo-scrolled { display: inline-block; }

/* 导航菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    flex-wrap: nowrap;
    /* flex-shrink: 1; */
    gap: clamp(1px, 0.15vw, 3px);
}

.nav-menu>li {
    position: relative;
    margin: 0;
    /* flex-shrink: 1; */
}

.nav-menu>li>a {
    display: flex;
    padding: clamp(4px, 0.4vh, 7px) clamp(5px, 0.4vw, 10px);
    color: var(--white);
    text-decoration: none;
    font-size: clamp(10px, 1.2vw, 24px);
    font-weight: 700;
    text-align: center;
    white-space: nowrap;
    line-height: 1;
    border-radius: 15px;
    transition: var(--transition-normal);
    min-width: auto;
    background-image: none;
}

.nav-menu>li>a.active {
    color: var(--primary-color);
    background-image: url('../images/topitem.png');
    min-width: clamp(70px, 8vw, 140px);
    height: clamp(30px, 4vw, 65px);
    background-size: 90% 90%;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    /* z-index: 201; */
}

.nav-menu>li:hover>a:not(.active),
.nav-menu>li>a.nav-hover {
    color: var(--primary-color);
    background-image: url('../images/topitem.png');
    min-width: clamp(70px, 8vw, 140px);
    height: clamp(30px, 4vw, 65px);
    background-size: 90% 90%;
    background-position: center;
    background-repeat: no-repeat;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 68px;
    background-size: 100% 100%;
}

/* 当导航菜单被hover时，临时隐藏active项的高亮样式 */
.nav-menu.menu-hovering>li>a.active {
    background-image: none;
    color: var(--white);
    font-weight: 500;
}

/* 清除hover样式的类 */
.nav-menu>li>a.nav-no-hover {
    background-image: none !important;
}

.top-nav.scrolled .nav-menu>li:not(:hover)>a:not(.active) {
    color: var(--text-color) !important;
}

.top-nav.scrolled .nav-menu>li>a.active {
    color: var(--text-color) !important;
}

.top-nav.scrolled .nav-menu>li:hover>a.active {
    color: var(--primary-color) !important;
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: calc(100% - 13px);
    left: 0;
    min-width: clamp(100px, 8vw, 200px);
    /* 多背景图：先写的图在上层，用逗号分隔 */
    background-image: 
        url('../images/cut-pic-top.png'),   /* 顶部图 */
        url('../images/cut-pic-bottom.png');/* 底部图 */
    /* 分别设置每张图的尺寸：顶部图占上半部分，底部图占下半部分 */
    background-size: 100% 80px, 100% 80%;
    /* 分别定位：顶部图靠上，底部图靠下 */
    background-position: top center, bottom center;
    background-repeat: no-repeat; /* 禁止重复 */
    padding: 20px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition-normal);
    list-style: none;
    z-index: 200;
    /* 可选：固定高度（如果需要精准拼接） */
    /* height: 200px; */
}

.nav-menu>li:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    /* transform: translateY(0); */
}

.dropdown-menu li a {
    display: block;
    padding: clamp(8px, 0.8vh, 12px) clamp(5px, 1.2vw, 20px);
    color: black;
    text-decoration: none;
    font-size: clamp(12px, 1.2vw, 20px);
    /* transition: var(--transition-normal); */
    white-space: nowrap;
    text-align: center;
    margin: 0;
    /* 确保没有外边距 */
}

.dropdown-menu li a:hover {
    background: var(--primary-color);
    color: var(--white);
}

/* 右侧工具栏 */
.nav-tools {
    display: flex;
    align-items: center;
    gap: clamp(2px, 0.3vw, 5px);
    flex-shrink: 0;
}

.lang-switch {
    color: var(--white);
    background-image: url('../images/topnav_en.png');
    background-size: 90% 90%;
    background-position: center;
    background-repeat: no-repeat;
    font-size: clamp(12px, 1.1vw, 18px);
    font-weight: 700;
    text-decoration: none;
    width: clamp(50px, 5vw, 85px);
    height: clamp(38px, 4vw, 65px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-box {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding-left: 30px;
    width: clamp(100px, 10vw, 170px);
    height: clamp(38px, 4vw, 65px);
    background-image: url('../images/topnav.png');
    background-size: 90% 90%;
    background-position: center;
    background-repeat: no-repeat;
    cursor: pointer;
}

.search-box img {
    text-align: center;
    width: clamp(20px, 1vw, 40px);
}

/* 搜索框容器 */
.search-container {
    position: fixed;
    top: clamp(80px, 8vw, 130px);
    right: clamp(50px, 10vw, 200px);
    background: rgba(255, 255, 255, 0.95);
    padding: 10px 15px;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-normal);
    border-radius: 25px;
    box-shadow: var(--shadow-light);
}

.search-container.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    border-bottom: 3px solid var(--primary-color);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    background: transparent;
    border-radius: 25px;
    padding: 5px 10px;
    min-width: clamp(250px, 25vw, 400px);
}

.search-icon {
    width: 20px;
    height: 20px;
    margin-right: 10px;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: clamp(16px, 1.4vw, 23px);
    color: black;
}

.search-input::placeholder {
    color: black;
}

/* ========================================
   二级页面通用样式
   ======================================== */

/* 二级页面通用 Banner 样式 */
.page-banner {
    background: url('../images/back_image.png') no-repeat center;
    background-size: cover;
    padding: 120px 5% 80px;
    position: relative;
    overflow: hidden;
    min-height: 325px;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.3;
}

.banner-content {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 15px;
}

.banner-title {
    color: var(--white);
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 600;
}

.banner-subtitle {
    color: rgba(255, 255, 255, 0.8);
    font-size: clamp(14px, 1.5vw, 18px);
    margin-top: 10px;
}

.banner-dot {
    width: 12px;
    height: 12px;
    background: var(--white);
    border-radius: 50%;
    opacity: 0.8;
}

/* ========================================
   底部页脚样式
   ======================================== */
.footer {
    background-image: url('../images/base.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: var(--white);
}

.footer-content {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
}
.footer-logo img {
    max-width: 200px;
    margin-left: 30px;
}



.footer-info {
    margin-top: clamp(10px, 1.5vw, 20px);
}

.footer-info span {
    margin-right: 15px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.footer-info span:first-child {
    margin-left: 40px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    margin-top: clamp(10px, 1.5vw, 20px);
}

.footer-links-column h4 {
    color: var(--white);
    margin-bottom: 30px;
    font-size: 20px;
    margin-top: 20px;
}

.footer-links-column a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    transition: var(--transition-normal);
    margin-right: 10px;
}

.footer-links-column a:first-of-type {
    text-decoration: underline;
}

.footer-links-column a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    margin-top: clamp(100px, 5vw, 150px);
    padding-bottom: 20px;
    text-align: center;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
}


/* ========================================
   响应式媒体查询 - 导航栏
   ======================================== */
@media screen and (max-width: 1400px) {
    .nav-menu {
        gap: clamp(2px, 0.2vw, 5px);
    }
}

@media screen and (max-width: 1200px) {
    .nav-menu {
        gap: clamp(1px, 0.15vw, 3px);
    }

    .nav-menu>li>a {
        font-size: clamp(10px, 1.2vw, 24px);
        padding: clamp(5px, 0.6vh, 8px) clamp(6px, 0.5vw, 14px);
    }

    .dropdown-menu {
        min-width: clamp(80px, 8vw, 150px);
    }

    .dropdown-menu li a {
        font-size: clamp(10px, 1.2vw, 18px);
        padding: clamp(5px, 0.6vh, 8px) clamp(8px, 1.2vw, 15px);
    }

    .lang-switch {
        width: clamp(45px, 4.5vw, 75px);
        height: clamp(35px, 3.5vw, 55px);
        font-size: clamp(11px, 1.2vw, 20px);
    }

    .search-box {
        width: clamp(90px, 9vw, 150px);
        height: clamp(35px, 3.5vw, 55px);
    }
}

@media screen and (max-width: 900px) {
    .nav-menu>li>a {
        font-size: clamp(10px, 1.2vw, 22px);
    }

    .dropdown-menu li a {
        font-size: clamp(9px, 1.1vw, 18px);
        padding: clamp(4px, 0.5vh, 7px) clamp(7px, 1vw, 12px);
    }

    .lang-switch {
        width: clamp(40px, 4vw, 65px);
        height: clamp(32px, 3.2vw, 50px);
        font-size: clamp(10px, 1.1vw, 18px);
    }

    .search-box {
        width: clamp(80px, 8vw, 130px);
        height: clamp(32px, 3.2vw, 50px);
    }
}

@media screen and (max-width: 768px) {
    .top-nav {
        padding: 10px 2%;
        flex-wrap: wrap;
    }

    .nav-menu {
        overflow-x: auto;
        scrollbar-width: none;
        order: 3;
        width: 100%;
        justify-content: flex-start;
        margin-top: 10px;
    }

    .nav-menu::-webkit-scrollbar {
        display: none;
    }

    .nav-menu>li {
        margin: 0 clamp(2px, 0.2vw, 5px);
        flex-shrink: 0;
    }

    .dropdown-menu {
        min-width: 100px;
    }

    .dropdown-menu li a {
        font-size: 14px;
        padding: 8px 12px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
        flex-wrap: wrap;
        gap: 30px;
    }
}

@media screen and (max-width: 480px) {
    .logo img {
        max-width: 120px;
    }

    .nav-tools {
        gap: 2px;
    }

    .lang-switch {
        width: 40px;
        height: 32px;
        font-size: 11px;
    }

    .search-box {
        width: 70px;
        height: 32px;
    }

    .dropdown-menu {
        min-width: 80px;
    }

    .dropdown-menu li a {
        font-size: 12px;
        padding: 6px 10px;
    }

    .footer {
        padding: 40px 3% 20px;
    }

    .footer-links {
        gap: 20px;
    }
}