/* --- 通用样式与变量 --- */
:root {
    --primary-color: #007bff; /* Awwwards 常用蓝色 */
    --secondary-color: #00bcd4; /* 辅助色 */
    --text-color-dark: #333;
    --text-color-light: #eee;
    --background-light: #f8f8f8;
    --background-header: #fff;
    --border-color: #e0e0e0;
    --hover-bg: rgba(0, 0, 0, 0.05);
    --animation-speed: 0.4s;
    --cubic-bezier: cubic-bezier(0.65, 0.05, 0.36, 1);
    --cubic-bezier-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --navbar-padding-x: 40px;
    --scrollbar-width: 15px; /* 滚动条宽度 */
}

/* 始终显示滚动条，防止页面跳动 */
html {
    overflow-y: scroll;
}

/* 当弹出框显示时禁止body滚动 */
body.explore-active {
    overflow: hidden;
}

/* 确保header宽度固定 */
.header {
    width: 100%;
    left: 0;
    right: 0;
    box-sizing: border-box;
}

/* 确保navbar宽度固定且居中 */
.navbar {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--navbar-padding-x);
    box-sizing: border-box;
}

/* 自定义滚动条样式，确保一致性 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* 当弹出菜单显示时的body样式 */
body[style*="overflow: hidden"] {
    padding-right: 10px; /* 补偿滚动条宽度 */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color-dark);
    background-color: var(--background-light);
    overflow-x: hidden;
    overflow-y: scroll; /* 始终显示垂直滚动条，防止页面抖动 */
    scroll-behavior: smooth;
    padding-bottom: 120px;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: all 0.3s var(--cubic-bezier);
}

a:hover {
    color: var(--secondary-color);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s var(--cubic-bezier);
    border: none;
    cursor: pointer;
}

.btn.primary-btn {
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.25);
}

.btn.primary-btn:hover {
    background-color: var(--secondary-color);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
    transform: translateY(-2px);
}

.btn-login {
    background: none;
    color: var(--text-color-dark);
    padding: 8px 15px;
    border-radius: 5px;
}
.btn-login:hover {
    background-color: var(--hover-bg);
    color: var(--primary-color);
}

.btn-register {
    background-color: var(--primary-color);
    color: #fff;
    padding: 8px 15px;
    border-radius: 5px;
}
.btn-register:hover {
    background-color: var(--secondary-color);
}

/* --- 头部导航栏 --- */
.header {
    background-color: var(--background-header);
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000; /* Default z-index */
    transition: background-color 0.3s ease;
}

.header.explore-active { /* 当explore菜单激活时，header背景变为透明 */
    background-color: transparent;
    box-shadow: none;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--navbar-padding-x);
    position: relative; /* 用于搜索框和按钮的定位上下文 */
}

.logo a {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-color-dark);
}

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    flex-grow: 1; /* 占据中间空间 */
    justify-content: center; /* 导航链接居中 */
}

.nav-links li {
    margin: 0 25px;
}

.nav-links a {
    color: var(--text-color-dark);
    font-weight: 500;
    font-size: 1.05rem;
    position: relative;
    padding: 5px 0;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s var(--cubic-bezier);
}

.nav-links a:hover::after {
    width: 100%;
}

.header-right-actions {
    display: flex;
    align-items: center;
    gap: 20px;
    /* 确保这些元素在 explore-menu-overlay 之上 */
    position: relative; /* 提供定位上下文 */
    z-index: 1051; /* 高于 explore-menu-overlay */

    background-color: transparent; /* 改为透明背景 */
    padding: 0 var(--navbar-padding-x); /* 匹配导航栏内边距 */
    /* 负边距抵消 padding，让其内容边缘与视口边缘对齐 */
    margin-right: calc(-1 * var(--navbar-padding-x));
    transition: background-color 0.3s ease, border-radius 0.3s ease, padding 0.3s ease;
    box-shadow: none; /* 移除阴影 */
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    justify-content: flex-end; /* 确保子元素靠右对齐 */
}

.explore-dropdown-container.active ~ .header-right-actions {
    background-color: transparent; /* 保持透明背景 */
    box-shadow: none; /* 移除阴影 */
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
    padding-bottom: 40px; /* 保持底部内边距，与菜单内容对齐 */
}

/* --- 搜索框样式 --- */
.search-box {
    display: flex;
    align-items: center;
    background-color: var(--background-light);
    border-radius: 50px;
    padding: 5px 15px;
    transition: all 0.4s var(--cubic-bezier);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    width: 200px; /* 默认宽度 */
    margin-right: 20px; /* 与登录注册按钮保持间距 */
    position: relative; /* 提供定位上下文 */
}

/* 搜索框展开时的样式 */
.header.explore-active .search-box {
    width: 300px; /* 调整展开宽度，避免影响布局 */
    background-color: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(229, 231, 235, 0.5);
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

/* 这个选择器已被替换为上面的新样式，所以删除这个重复的样式 */

.search-input {
    border: none;
    background: transparent;
    outline: none;
    padding: 8px 0;
    font-size: 0.95rem;
    color: var(--text-color-dark);
    width: 150px; /* 默认宽度 */
    transition: all 0.4s var(--cubic-bezier);
    margin-left: 8px; /* 与搜索图标保持间距 */
}

.header.explore-active .search-input {
    width: 250px; /* 调整输入框宽度，与搜索框容器匹配 */
}

/* 搜索图标样式 */
.search-box .icon-search {
    font-size: 1.1rem;
    color: var(--text-color-light);
    transition: color 0.4s var(--cubic-bezier);
}

.header.explore-active .search-box .icon-search {
    color: var(--text-color-dark);
}

.search-input::placeholder {
    color: var(--light-text-color);
}

.search-icon-btn {
    background: none;
    border: none;
    color: var(--text-color-dark);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0 5px;
    transition: color 0.2s ease;
}

.search-icon-btn:hover {
    color: var(--primary-color);
}

.auth-buttons {
    display: flex;
    gap: 10px;
    position: relative; /* 添加相对定位 */
    z-index: 1052; /* 确保在搜索框之上 */
}

/* 确保在搜索框展开时登录注册按钮样式不变 */
.header.explore-active .auth-buttons {
    position: relative;
    z-index: 1052;
}

/* --- "Explore" 下拉菜单 --- */
.explore-dropdown-container {
    position: relative; /* 定位 explore-trigger */
    z-index: 1050;
}

.explore-trigger {
    display: flex;
    align-items: center;
    font-weight: 600;
}

.explore-trigger .explore-icon {
    margin-left: 8px;
    transition: transform 0.3s var(--cubic-bezier);
    font-size: 0.9em;
}

.explore-dropdown-container.active .explore-trigger .explore-icon {
    transform: rotate(90deg);
}

.explore-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0); /* 初始透明 */
    backdrop-filter: blur(0px); /* 初始不模糊 */
    display: flex;
    justify-content: center;
    align-items: flex-start;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: background-color var(--animation-speed) ease-out,
                backdrop-filter var(--animation-speed) ease-out,
                opacity var(--animation-speed) ease-out,
                visibility var(--animation-speed);
    z-index: 1040; /* 在header的元素之下，但在主体内容之上 */
}

.explore-dropdown-container.active .explore-menu-overlay {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    background-color: rgba(0, 0, 0, 0.6); /* 激活时背景变黑 */
    backdrop-filter: blur(8px); /* 激活时背景模糊 */
    transition: background-color var(--animation-speed) ease-in,
                backdrop-filter var(--animation-speed) ease-in,
                opacity var(--animation-speed) ease-in;
}

.explore-menu-content {
    background-color: #fff;
    /* 宽度计算：导航栏最大宽度 + 两侧 padding */
    width: calc(1400px + (2 * var(--navbar-padding-x)));
    /* 确保在小屏幕下不会超过视口宽度 */
    /* 这里的 100% 是指 explore-menu-overlay 的宽度（100vw），减去两侧 navbar-padding-x */
    max-width: calc(100vw - (2 * var(--navbar-padding-x)));

    padding: 40px; /* 保持默认内边距 */

    /* 固定定位，使其从屏幕顶部滑入，并水平居中 */
    position: fixed;
    top: 0; /* 初始位置在视口顶部 */
    left: 50%; /* 水平居中 */
    transform: translateX(-50%) translateY(-100vh); /* 初始隐藏在屏幕上方 */

    /* 调整 padding-top，使其内容从导航栏下方开始 */
    /* 计算公式：header-top-padding + header-height + header-bottom-padding + 下拉菜单顶部到内容区的额外间距 */
    padding-top: calc(15px + 40px + 15px + 40px); /* 假设 navbar 高度约 40px, header padding 15px */

    border-radius: 0 0 20px 20px; /* 仅底部圆角 */
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    /* 动画改为 transform */
    transition: transform var(--animation-speed) var(--cubic-bezier) 0.1s, opacity 0.2s ease 0.3s;
    opacity: 0; /* 初始透明 */

    display: flex;
    flex-direction: column;
    height: auto;

    /* Z-index 确保它在 header-right-actions 之下，但在遮罩之上 */
    z-index: 1045; /* 低于 header-right-actions (1051) 和 navbar (1051) */
}

.explore-dropdown-container.active .explore-menu-content {
    transform: translateX(-50%) translateY(0); /* 激活时下降到视口顶部 */
    opacity: 1; /* 激活时完全可见 */
}

.menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.menu-header h2 {
    font-size: 2.5rem;
    color: var(--text-color-dark);
    font-weight: 700;
}

.close-menu-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text-color-dark);
    cursor: pointer;
    transition: transform 0.2s ease, color 0.2s ease;
}

.close-menu-btn:hover {
    transform: rotate(90deg);
    color: var(--primary-color);
}

.menu-body {
    display: flex;
    flex: 1; /* 让内容占据剩余空间 */
    gap: 40px;
    overflow: hidden; /* 隐藏超出内容，以便于动画 */
}

.menu-categories {
    flex-basis: 250px; /* 左侧分类固定宽度 */
    flex-shrink: 0;
    padding-right: 20px;
    border-right: 1px solid var(--border-color);
    overflow-y: auto; /* 如果分类过多可以滚动 */
}

.menu-categories ul {
    list-style: none;
}

.menu-categories li {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-color-dark);
    padding: 12px 0;
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 4px solid transparent;
    padding-left: 10px;
}

.menu-categories li:hover {
    color: var(--primary-color);
    background-color: var(--hover-bg);
}

.menu-categories li.active {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    background-color: var(--hover-bg);
}

.menu-details {
    flex-grow: 1; /* 右侧内容占据剩余空间 */
    position: relative; /* 用于内容项的绝对定位 */
    padding-left: 20px;
}

.category-detail {
    display: none; /* 默认隐藏所有详情 */
    position: absolute;
    top: 0;
    left: 20px; /* 从左边开始 */
    width: calc(100% - 20px);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s var(--cubic-bezier-ease-out), transform 0.4s var(--cubic-bezier-ease-out);
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); /* 内部再次网格布局 */
    gap: 30px;
}

.category-detail.active {
    display: grid; /* 激活时显示为grid */
    opacity: 1;
    transform: translateY(0);
}

.detail-column h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 600;
}

.detail-column ul {
    list-style: none;
}

.detail-column ul li {
    margin-bottom: 10px;
}

.detail-column ul li a {
    color: var(--text-color-dark);
    font-size: 0.95rem;
    display: block;
    padding: 5px 0;
}

.detail-column ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
    transform: translateX(0); /* 覆盖默认链接的translateX */
}

.menu-footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--light-text-color);
}

/* --- 主体内容区 (与之前类似，略有调整) --- */
.main-content {
    max-width: 1400px;
    margin: 60px auto;
    padding: 0 40px;
}

.hero-section {
    position: relative;
    height: 70vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border-radius: 20px;
    overflow: hidden;
    margin-bottom: 80px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.hero-text {
    z-index: 2;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInSlideUp 0.8s var(--cubic-bezier-ease-out) forwards 0.5s;
}

.hero-section h1 {
    font-size: 4.5rem;
    margin-bottom: 25px;
    font-weight: 800;
    line-height: 1.1;
    text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.hero-section p {
    font-size: 1.5rem;
    margin-bottom: 40px;
    font-weight: 300;
}

.content-section {
    padding: 80px 0;
    text-align: center;
    margin-bottom: 60px;
    background-color: #fff;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.content-section h2 {
    font-size: 3rem;
    margin-bottom: 50px;
    font-weight: 700;
    color: var(--text-color-dark);
    position: relative;
    display: inline-block;
}

.content-section h2::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: -15px;
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    padding: 0 20px;
}

.project-card {
    background-color: var(--background-light);
    border-radius: 15px;
    padding: 35px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    text-align: left;
    transition: transform 0.3s var(--cubic-bezier), box-shadow 0.3s var(--cubic-bezier);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.project-card h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--text-color-dark);
}

.project-card p {
    font-size: 1.05rem;
    color: var(--light-text-color);
    margin-bottom: 25px;
}

.project-card a {
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.project-card a i {
    transition: transform 0.2s ease-out;
}

.project-card a:hover i {
    transform: translateX(5px);
}

.services-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    padding: 0 20px;
}

.service-item {
    background-color: var(--background-light);
    border-radius: 15px;
    padding: 35px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    text-align: center;
    transition: transform 0.3s var(--cubic-bezier), box-shadow 0.3s var(--cubic-bezier);
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.service-item i {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.service-item h3 {
    font-size: 1.6rem;
    margin-bottom: 15px;
    color: var(--text-color-dark);
}

.service-item p {
    font-size: 1rem;
    color: var(--light-text-color);
}

/* --- 底部居中悬浮菜单 (与之前类似，无需大改) --- */
.floating-center-menu {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: none;
}

.menu-trigger-btn {
    width: 70px;
    height: 70px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.2rem;
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.4);
    cursor: pointer;
    transition: transform 0.3s var(--cubic-bezier), background-color 0.3s var(--cubic-bezier);
    pointer-events: auto;
}

.menu-trigger-btn:hover {
    transform: scale(1.08);
    background-color: var(--secondary-color);
}

.floating-center-menu.active .menu-trigger-btn i {
    transform: rotate(135deg);
    transition: transform 0.3s var(--cubic-bezier);
}

.menu-options {
    list-style: none;
    display: flex;
    background-color: #fff;
    border-radius: 40px;
    padding: 15px 25px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    margin-top: 20px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(30px);
    transition: opacity 0.4s var(--cubic-bezier), visibility 0.4s, transform 0.4s var(--cubic-bezier);
    pointer-events: none;
}

.floating-center-menu.active .menu-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.menu-options li {
    margin: 0 10px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
    transition-delay: calc(var(--i) * 0.05s + 0.2s);
}

.floating-center-menu.active .menu-options li {
    opacity: 1;
    transform: translateY(0);
}

.menu-options li a {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-color-dark);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 30px;
    position: relative;
    transition: background-color 0.2s ease-out, color 0.2s ease-out;
}

.menu-options li a i {
    font-size: 1.4rem;
    margin-bottom: 5px;
    color: var(--primary-color);
}

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

/* Tooltip for floating menu */
.menu-options li a::before {
    content: attr(data-tooltip);
    position: absolute;
    top: -35px;
    background-color: var(--background-dark);
    color: var(--text-color-light);
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.2s ease, visibility 0.2s, transform 0.2s ease;
    pointer-events: none;
    z-index: 10; /* Make sure tooltip is above other list items */
}

.menu-options li a:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* --- 动画关键帧 --- */
@keyframes fadeInSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- 响应式设计 --- */
@media (max-width: 992px) {
    .navbar {
        padding: 0 var(--navbar-padding-x, 20px); /* 在 992px 视口下的默认值 */
    }
    .logo {
        flex-basis: 100%; /* 独占一行 */
        text-align: center;
        margin-bottom: 15px;
    }
    .nav-links {
        margin-top: 15px;
        flex-basis: 100%;
        justify-content: center;
        order: 2; /* 放在搜索框和按钮下面 */
    }
    .nav-links li {
        margin: 0 15px;
    }
    .header-right-actions {
        flex-basis: 100%;
        justify-content: center;
        order: 1; /* 放在导航链接上面 */
        padding: 0 var(--navbar-padding-x, 20px);
        margin-right: calc(-1 * var(--navbar-padding-x, 20px));
    }
    
    /* 搜索框在中等屏幕上的样式 */
    .search-box {
        width: 180px; /* 较小的默认宽度 */
        margin-right: 15px;
    }
    
    .header.explore-active .search-box {
        width: 250px; /* 较小的展开宽度 */
    }
    
    .search-input {
        width: 130px; /* 较小的默认宽度 */
    }
    
    .header.explore-active .search-input {
        width: 200px; /* 较小的展开宽度 */
    }
    .explore-dropdown-container.active ~ .header-right-actions {
        /* 响应式下，也需要融合效果 */
        background-color: #fff;
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
        border-bottom-left-radius: 20px;
        border-bottom-right-radius: 20px;
        padding-bottom: 30px; /* 调整移动端底部内边距 */
    }
    .explore-dropdown-container.active ~ .header-right-actions .search-box {
        width: 100%; /* 在小屏幕上占满 */
    }
    .explore-dropdown-container.active ~ .header-right-actions .search-input {
        width: calc(100% - 40px); /* 减去按钮宽度 */
    }

    .explore-menu-content {
        padding: 30px;
        /* 宽度计算：当前视口宽度 - 两侧 padding */
        width: calc(100vw - (2 * var(--navbar-padding-x, 20px)));
        max-width: calc(100vw - (2 * var(--navbar-padding-x, 20px)));
        left: 50%;
        transform: translateX(-50%) translateY(-100vh);
        padding-top: calc(15px + 20px + 15px + 30px); /* 适应移动端头部高度 */
        flex-direction: column; /* 垂直布局 */
        height: auto;
    }
    .explore-dropdown-container.active .explore-menu-content {
        transform: translateX(-50%) translateY(0);
    }
    .menu-header h2 {
        font-size: 2rem;
    }
    .close-menu-btn {
        font-size: 1.5rem;
    }
    .menu-body {
        flex-direction: column;
        gap: 20px;
    }
    .menu-categories {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-right: 0;
        padding-bottom: 20px;
        max-height: 200px; /* 限制高度，可滚动 */
    }
    .menu-categories ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    .menu-categories li {
        font-size: 1.1rem;
        padding: 8px 15px;
        border-radius: 5px;
        border-left: none; /* 移除左边框 */
    }
    .menu-categories li.active {
        border-bottom: 3px solid var(--primary-color); /* 底部边框指示激活状态 */
        border-left: none;
    }
    .menu-details {
        padding-left: 0;
        margin-top: 20px;
    }
    .category-detail {
        left: 0;
        width: 100%;
    }

    .hero-section h1 {
        font-size: 3rem;
    }
    .hero-section p {
        font-size: 1.2rem;
    }

    .content-section h2 {
        font-size: 2.2rem;
    }
    .projects-grid, .services-list {
        grid-template-columns: 1fr;
        padding: 0 15px;
    }

    .floating-center-menu {
        bottom: 20px;
    }
    .menu-trigger-btn {
        width: 60px;
        height: 60px;
        font-size: 1.8rem;
    }
    .menu-options {
        padding: 10px 15px;
    }
    .menu-options li {
        margin: 0 5px;
    }
    .menu-options li a {
        font-size: 0.75rem;
    }
    .menu-options li a i {
        font-size: 1.1rem;
    }
}

@media (max-width: 576px) {
    .header {
        padding: 10px 0;
    }
    .navbar {
        padding: 0 var(--navbar-padding-x, 15px);
    }
    .logo {
        font-size: 1.5rem;
    }
    .nav-links li {
        margin: 0 8px;
    }
    .nav-links a {
        font-size: 0.9rem;
    }

    .header-right-actions {
        gap: 10px;
        padding: 0 var(--navbar-padding-x, 15px);
        margin-right: calc(-1 * var(--navbar-padding-x, 15px));
    }
    .explore-dropdown-container.active ~ .header-right-actions {
        /* 响应式下，也需要融合效果 */
        background-color: #fff;
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
        border-bottom-left-radius: 20px;
        border-bottom-right-radius: 20px;
        padding-bottom: 20px; /* 调整更小屏幕底部内边距 */
    }
    .auth-buttons {
        gap: 5px;
    }
    .btn-login, .btn-register {
        padding: 6px 10px;
        font-size: 0.85rem;
    }

    .explore-menu-content {
        padding: 20px;
        width: calc(100vw - (2 * var(--navbar-padding-x, 15px)));
        max-width: calc(100vw - (2 * var(--navbar-padding-x, 15px)));
        left: 50%;
        transform: translateX(-50%) translateY(-100vh);
        padding-top: calc(10px + 15px + 10px + 20px); /* 适应更小屏幕的头部高度 */
    }
    .explore-dropdown-container.active .explore-menu-content {
        transform: translateX(-50%) translateY(0);
    }
    .menu-header h2 {
        font-size: 1.8rem;
    }
    .close-menu-btn {
        font-size: 1.2rem;
    }
    .menu-categories li {
        font-size: 1rem;
        padding: 6px 10px;
    }

    .hero-section h1 {
        font-size: 1.8rem;
    }
    .hero-section p {
        font-size: 0.9rem;
    }
    .content-section h2 {
        font-size: 1.8rem;
    }
    .project-card h3 {
        font-size: 1.5rem;
    }
    .service-item h3 {
        font-size: 1.4rem;
    }
}