/* 全局重置和变量 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0056b3;
    --secondary-color: #6c757d;
    --text-color: #ffffff; /* 改为白色文字 */
    --text-light: #cccccc; /* 浅灰色文字 */
    --white: #ffffff;
    --dark-bg: #0a0a0a;
    --light-bg: #1a1a1a; /* 浅深色背景 */
    --border-color: #333333;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --transition: all 0.3 s ease;
    
    /* 配置选项 - 可以在这里修改菜单层级显示 */
    --show-submenu-level-1: true;
    --show-submenu-level-2: true;
}

.container {
    width: 100%;
    max-width: 1200px; /* 恢复合理的最大宽度 */
    margin: 0 auto;
    padding: 0 20px; /* 保持正常的内边距 */
}

/* 恢复主要区域的原始样式 */
.main-content,
.hero-section,
.how-we-help,
.footer {
    width: 100%;
    margin: 0;
    padding: 0;
}

.hero-section .container,
.how-we-help .container,
.footer .container {
    max-width: 1200px; /* 恢复最大宽度 */
    padding: 0 20px;
}

/* 恢复导航栏的原始样式 */
.navbar {
    background-color: var(--dark-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
}

/* 关键修改：将MENU图标定位到整个页面的最左上角，但留出空隙 */
.navbar {
    position: relative;
}

/* MENU图标固定在页面最左上角，留出10px空隙 */
.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 10px;
    border-radius: 4px;
    transition: var(--transition);
    position: fixed; /* 固定定位到整个页面 */
    left: 10px; /* 留出10px左边距 */
    top: 10px; /* 留出10px上边距 */
    height: 50px;
    width: 50px;
    z-index: 1001;
    background-color: var(--dark-bg);
    border-radius: 8px;
}

.menu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.hamburger-icon {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 20px;
    height: 14px;
}

.hamburger-icon span {
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition);
    border-radius: 1px;
    display: block;
    transform: none !important; /* 确保默认状态无旋转 */
    opacity: 1 !important; /* 确保默认状态不透明 */
}

/* 汉堡图标变为X形 - 只在.active状态下应用 */
.menu-toggle.active .hamburger-icon span:nth-child(1) {
    transform: rotate(45deg) translateY(6px) !important;
}

.menu-toggle.active .hamburger-icon span:nth-child(2) {
    opacity: 0 !important;
}

.menu-toggle.active .hamburger-icon span:nth-child(3) {
    transform: rotate(-45deg) translateY(-6px) !important;
}

/* 导航容器 - 调整padding为MENU图标留出空间 */
.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px 0 80px; /* 左侧留出80px给MENU图标 */
    height: 70px;
    max-width: 1400px; /* 增加最大宽度以利用更多空间 */
    margin: 0 auto;
}

/* 直接显示的一级菜单 - 居中显示，充分利用页面宽度 */
.desktop-categories {
    display: flex;
    list-style: none;
    gap: 35px;
    margin: 0;
    padding: 0;
    flex: 1;
    justify-content: center;
    position: relative;
}

.desktop-category-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 16px;
    position: relative;
    padding: 10px 0;
    transition: var(--transition);
    white-space: nowrap;
}

.desktop-category-link:hover {
    color: var(--primary-color);
}

/* 桌面端悬停二级菜单 */
.desktop-category {
    position: relative;
}

.desktop-submenu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--light-bg);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 20px;
    min-width: 400px;
    max-width: 600px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(10px);
    transition: var(--transition);
    z-index: 1000;
    display: flex !important;
    gap: 30px !important;
}

.desktop-category:hover .desktop-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.desktop-submenu-column {
    flex: 1;
    padding: 0 15px;
}

.desktop-submenu-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--white);
}

.desktop-submenu-column ul {
    list-style: none;
}

.desktop-submenu-column li {
    margin-bottom: 8px;
}

.desktop-submenu-column a {
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    transition: var(--transition);
}

.desktop-submenu-column a:hover {
    color: var(--primary-color);
    transform: translateX(3px);
}

.logo {
    min-width: 120px; /* 为logo预留固定空间 */
    text-align: right;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
}

/* 导航菜单 - 默认隐藏 */
.nav-menu {
    display: none;
}

/* 当MENU激活时显示完整菜单 - 在MENU图标正下方 */
.nav-menu.active {
    display: block;
    position: fixed;
    top: 70px; /* MENU图标下方 */
    left: 10px; /* 与MENU图标对齐 */
    background: var(--dark-bg);
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    max-height: calc(100vh - 90px);
    overflow-y: auto;
    min-width: 250px;
    max-width: 800px;
}

/* 紧凑的菜单布局 - 左侧一级菜单纵向排列，右侧二级菜单 */
.nav-menu.active .nav-list {
    display: flex;
    flex-direction: row;
    gap: 30px;
    width: 100%;
    margin: 0;
    padding: 0;
}

/* 一级菜单纵向排列 */
.nav-menu.active .primary-menu {
    display: flex;
    flex-direction: column;
    gap: 15px;
    min-width: 180px;
}

.nav-menu.active .primary-menu-item {
    padding: 12px 15px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 6px;
    transition: var(--transition);
    cursor: pointer;
}

.nav-menu.active .primary-menu-item:hover,
.nav-menu.active .primary-menu-item.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--primary-color);
}

/* 二级菜单区域 */
.nav-menu.active .secondary-menu {
    flex: 1;
    min-width: 250px;
}

.nav-menu.active .secondary-menu-content {
    display: none;
}

.nav-menu.active .secondary-menu-content.active {
    display: block;
}

.nav-menu.active .submenu-column {
    flex: 1;
    min-width: 200px;
}

.nav-menu.active .submenu-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-menu.active .submenu-column ul {
    list-style: none;
}

.nav-menu.active .submenu-column li {
    margin-bottom: 8px;
}

.nav-menu.active .submenu-column a {
    color: var(--text-light);
    font-size: 15px;
    text-decoration: none;
    transition: var(--transition);
}

.nav-menu.active .submenu-column a:hover {
    color: var(--primary-color);
    transform: translateX(3px);
}

.nav-menu.active .submenu-column {
    flex: 1;
    min-width: 200px;
}

.nav-menu.active .submenu-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-menu.active .submenu-column ul {
    list-style: none;
}

.nav-menu.active .submenu-column li {
    margin-bottom: 8px;
}

.nav-menu.active .submenu-column a {
    color: var(--text-light);
    font-size: 15px;
    text-decoration: none;
    transition: var(--transition);
}

.nav-menu.active .submenu-column a:hover {
    color: var(--primary-color);
    transform: translateX(3px);
}

/* 关闭按钮样式 */
.close-mobile-menu {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--white);
    font-size: 24px;
    cursor: pointer;
    padding: 10px;
    z-index: 1002;
}

/* 主标题样式 - 居中 */
.hero-header {
    text-align: center;
    margin-bottom: 40px;
}

/* 主标题样式 - 左侧 */
.hero-left-header {
    margin-bottom: 30px;
}

.hero-main-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--white);
    margin: 0;
    line-height: 1.2;
}

/* 移除原有的悬停子菜单 */
.has-submenu {
    position: static;
}

.submenu {
    display: none;
}

/* 恢复主要内容区域 - 深色背景 */
.hero-section {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 80px 0;
    /* 移除视口宽度设置 */
}

.how-we-help {
    padding: 100px 0;
    background-color: var(--light-bg);
    /* 移除视口宽度设置 */
}

.footer {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 60px 0 30px;
    /* 移除视口宽度设置 */
}

/* 网格布局调整 */
.hero-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 40px;
    width: 100%;
    max-width: none;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    width: 100%;
    max-width: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
    width: 100%;
    max-width: none;
}

/* 竖向卡片样式 */
.hero-card-vertical {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-image-tall {
    flex: 1;
    min-height: 300px; /* 确保足够高度 */
}

.hero-right {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 调整左右两侧高度对称 */
.hero-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 40px;
    align-items: stretch;
}

.hero-left {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.hero-card {
    flex: 1;
    min-height: 250px;
}

/* 卡片样式 */
.hero-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    margin-bottom: 30px;
}

.hero-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-image {
    height: 200px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.hero-card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: 25px;
}

.card-subtitle {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--white);
}

.card-description {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-light);
}

/* How We Help Clients 区域 */
.how-we-help {
    padding: 100px 0;
    background-color: var(--light-bg); /* 使用浅深色背景 */
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--white);
}

.section-description {
    font-size: 20px;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.service-image {
    height: 250px;
    overflow: hidden;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.service-card:hover .service-image img {
    transform: scale(1.1);
}

.service-content {
    padding: 30px 20px;
}

.service-subtitle {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--white);
}

.service-description {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.6;
}

.service-link {
    text-decoration: none;
    color: var(--white);
    transition: var(--transition);
}

.service-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

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

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--white);
    transform: translateX(3px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.back-to-top {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.back-to-top:hover {
    background-color: #003d82;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .desktop-categories {
        gap: 25px;
    }
    
    .desktop-category-link {
        font-size: 15px;
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 调整展开菜单的布局 */
    .nav-menu.active .nav-list {
        flex-direction: column;
        gap: 20px;
    }
    
    .nav-menu.active .nav-item {
        min-width: auto;
    }
    
    .nav-menu.active .submenu {
        display: block !important;
        margin-top: 10px !important;
    }
}

@media (max-width: 768px) {
    .desktop-categories {
        display: none; /* 移动端隐藏直接显示的一级菜单 */
    }
    
    .navbar .container {
        padding: 0 20px 0 60px; /* 保持左侧空间 */
    }
    
    .menu-toggle {
        left: 0;
        top: 0;
    }
    
    .nav-menu.active {
        top: 70px;
        left: 0;
        right: 0;
        padding: 20px 15px;
    }
    
    .nav-menu.active .nav-list {
        flex-direction: column;
        gap: 15px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-description {
        font-size: 18px;
    }
    
    .hero-main-title {
        font-size: 36px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .navbar .container {
        padding: 0 15px 0 60px;
    }
    
    .hero-section {
        padding: 60px 0;
    }
    
    .nav-menu.active .nav-list {
        gap: 10px;
    }
    
    .nav-menu.active .nav-link {
        font-size: 16px;
        padding: 10px 0;
    }
}