/* ==========================================================================
   2. 顶部页眉区域
   ========================================================================== */
header {
    background-color: #ffffff;
    padding-bottom: 15px;
}

.top-bar {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 10px 0;
    font-size: 14px;
    color: #666666;
    border-bottom: 1px solid #eeeeee;
    margin-bottom: 15px;
}

.top-bar span {
    margin-left: 20px;
}

.navbar {
    position: relative;
    display: flex;
    /* 修改：将 space-between 改为 flex-start，使导航菜单紧挨 Logo 左侧排列 */
    justify-content: flex-start;
    align-items: center;
    flex-wrap: wrap;
    padding: 15px 0;
}

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

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

.logo-image {
    display: block;
    width: 100%;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 100px;
    /* 修改：添加左侧外边距，让菜单与 Logo 之间保持适当间距（可根据设计调整数值） */
    margin: 0 0 0 230px;
    padding: 0;
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 0;
}

.nav-toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    margin: 5px auto;
    background-color: #333333;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-menu a {
    font-size: 17px;
    font-weight: 500;
    padding: 5px 0;
    text-decoration: none;
    color: inherit;
}

/* 移动端适配 768px分界 */
@media screen and (max-width: 768px) {
    /* 移动端显示汉堡按钮 */
    .nav-toggle {
        display: block;
    }

    /* 移动端菜单默认隐藏 */
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: #fff;
        padding: 20px;
        box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
        display: none;
        gap: 15px;
        /* 移动端重置左边距，避免下拉菜单偏移 */
        margin-left: 0;
    }

    /* JS添加open类后显示菜单 */
    .nav-menu-open {
        display: flex !important;
    }

    /* 汉堡按钮变成X样式 */
    .nav-toggle-open .nav-toggle-bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle-open .nav-toggle-bar:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle-open .nav-toggle-bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .nav-menu li {
        padding: 8px 0;
    }
}