/* 全局样式 */
body {
    font-family: "Microsoft Yahei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji" !important;
    color: #333;
    margin: 0;
    padding: 0;
}
a,a:hover{
    text-decoration: none!important;
}
/* 顶部导航区域 */
.header-container {
    position: relative;
    background-color: #fff;
    padding: 50px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo {
    height: 100px;
    margin-right: 15px;
}

.institute-name {
    font-size: 1.8rem;
    font-weight: bold;
    color: #0a5cad;
    line-height: 1.2;
}

.institute-english {
    font-size: 0.9rem;
    color: #0a5cad;
    letter-spacing: 0.5px;
}

.search-container {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.search-box {
    position: relative;
    width: 100%;
    max-width: 300px;
}

.search-input {
    width: 100%;
    padding: 8px 15px;
    border: 1px solid #ddd;
    border-radius: 0;
    font-size: 0.9rem;
}

.search-btn {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    background-color: #0a5cad;
    color: white;
    border: none;
    padding: 0 15px;
    cursor: pointer;
}

/* 导航菜单 */
.navbar-container {
    background-color: #0a5cad;
    z-index: 100;
}

.main-nav {
    padding: 0;
}

.main-nav .nav-item {
    position: relative;
    width: 10%;
}

.main-nav .nav-link {
    color: white !important;
    padding: 12px 0px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    letter-spacing: 3px;
    font-size: 18px;
}

.main-nav .nav-link:hover {
    background-color: #084a8a;
}

/* 二级菜单样式 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    display: none;
    float: left;
    min-width: 100px;
    padding: 5px 0;
    margin: 0;
    font-size: 1rem;
    color: #333;
    text-align: left;
    list-style: none;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0,0,0,0.15);
    border-radius: 0;
    box-shadow: 0 3px 6px rgba(0,0,0,0.1);
}

.dropdown-menu .dropdown-item {
    display: block;
    width: 100%;
    padding: 8px 20px;
    clear: both;
    font-weight: 400;
    color: #333;
    text-align: inherit;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
    transition: all 0.2s ease;
}

.dropdown-menu .dropdown-item:hover {
    color: #fff;
    background-color: #0a5cad;
    text-decoration: none;
}

/* 显示二级菜单 */
.nav-item.dropdown:hover .dropdown-menu {
    display: block;
}


/* 响应式调整 */
@media (max-width: 992px) {
    .institute-name {
        font-size: 1.5rem;
    }

    /* 移动端下拉菜单样式 */
    .navbar-container {
        padding: 0 15px;
    }
    
    .main-nav {
        display: flex;
        flex-direction: column;
    }
    
    .main-nav .nav-item {
        width: 100%;
    }
    
    .main-nav .nav-link {
        padding: 10px 15px;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .dropdown-menu {
        position: static;
        float: none;
        width: auto;
        margin-top: 0;
        background-color: transparent;
        border: 0;
        box-shadow: none;
        padding-left: 20px;
    }
    
    .dropdown-menu .dropdown-item {
        color: rgba(255,255,255,0.8);
        padding: 8px 0;
    }
    
    .dropdown-menu .dropdown-item:hover {
        color: #fff;
        background-color: transparent;
        padding-left: 5px;
    }
}

@media (max-width: 768px) {
    .logo {
        height: 60px;
    }
    
    .institute-name {
        font-size: 1.2rem;
    }
    
    .institute-english {
        font-size: 0.8rem;
    }
    
    .search-container {
        margin-top: 15px;
        justify-content: flex-start;
    }
}

@media (max-width: 576px) {
    .logo-container {
        justify-content: center;
        margin-bottom: 15px;
    }
    
    .search-box {
        max-width: 100%;
    }
}