/* 腾龙精线集团官网 - 头部和页脚样式 */
:root {
    --color-primary: #1A3C6E; /* - 主色 */
    --color-tech-blue: #005F8E; /* 科技蓝 - 辅助色 */
    --color-accent: #C9A35B; /* 金色 - 强调色，用于active状态 */
    --color-light-bg: #F8F9FA; /* 浅灰白 - 背景色 */
    --color-text-dark: #333333; /* 主文本色 */
    --color-text-light: #FFFFFF; /* 浅色文本 */
    --color-text-grey: #6C757D; /* 灰色文本 */
    --color-text-foot: #0f2341;
    --color-text-white: #FFFFFF;  
    --transition-speed: 0.3s;
    --border-radius: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', 'Helvetica Neue', 'Arial', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--color-text-dark);
    overflow-x: hidden;
    background-color: var(--color-light-bg);
}

/* 防止移动端菜单打开时页面滚动 */
body.no-scroll {
    overflow: hidden;
    position: fixed;
    width: 100%;
}

/* 导航栏样式 */
.header-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.4s ease;
    padding: 25px 0;
    background: transparent;
}

.header-nav.scrolled {
    background: var(--color-primary);
    padding: 15px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
}

.header-nav.scrolled .nav-link {
    color: var(--color-text-light);
}

.header-nav.scrolled .search-button {
    color: var(--color-text-light);
}

.header-nav.scrolled .logo img,
.header-nav.scrolled .mobile-logo img {
    filter: brightness(0) invert(1);
}

.nav-container {
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    padding: 0 30px;
}

/* 左侧Logo */
.logo {
    flex: 0 0 auto;
}

.logo img {
    height: 45px;
    transition: transform 0.3s ease;
    filter: brightness(0) invert(1);
}

.logo:hover img {
    transform: scale(1.05);
}

/* 中央导航区域 */
.nav-center {
    display: flex;
    gap: 35px;
    flex: 1;
    justify-content: center;
    align-items: center;
    margin: 0 30px;
}

/* 右侧功能区 */
.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
    flex: 0 0 auto;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--color-text-light);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    padding: 14px 18px;
    font-size: 18px;
    white-space: nowrap;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-family: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: #005F8E;
    transition: all 0.4s ease;
    transform: translateX(-50%);
}

.nav-link:hover {
    background: linear-gradient(135deg, var(--color-tech-blue), #005F8E);
    color: var(--color-text-light);
    position: relative;
    box-shadow: 0 6px 20px rgba(201, 163, 91, 0.4);
}

.nav-link:hover::after {
    width: 100%;
    background: var(--color-text-light);
}

.header-nav.scrolled .nav-link:hover {
    background: linear-gradient(135deg, var(--color-tech-blue), #005F8E);
    color: var(--color-text-light);
    position: relative;
    box-shadow: 0 6px 20px rgba(201, 163, 91, 0.4);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--color-tech-blue), #005F8E);
    color: var(--color-text-light);
    position: relative;
    box-shadow: 0 6px 20px rgba(201, 163, 91, 0.4);
}

.nav-link.active::after {
    width: 100%;
    background: var(--color-text-light);
}

/* 下拉菜单样式 */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 120px;
    background: #FFFFFF;
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    overflow: hidden;
    z-index: 100;
    margin-top: 10px;
    padding: 8px 0;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    margin-top: 10px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: var(--color-text-dark);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 2px solid transparent;
    font-size: 14px;
}

.dropdown-item:hover {
    background: rgba(0, 155, 123, 0.05);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

/* 多国语言下拉菜单图片样式 - 响应式设计 */
.dropdown-item img {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    border-radius: 2px;
    object-fit: cover;
    transition: transform 0.2s ease;
}

.language-option img {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    border-radius: 2px;
    object-fit: cover;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .dropdown-item img,
    .language-option img {
        width: 14px;
        height: 14px;
    }
}

@media (max-width: 768px) {
    .dropdown-item img,
    .language-option img {
        width: 12px;
        height: 12px;
        margin-right: 6px;
    }
}

@media (max-width: 480px) {
    .dropdown-item img,
    .language-option img {
        width: 10px;
        height: 10px;
        margin-right: 4px;
    }
}

/* 图片悬停效果 */
.dropdown-item:hover img,
.language-option:hover img {
    transform: scale(1.1);
}

/* 搜索按钮样式 */
.search-button {
    background: none;
    border: none;
    color: var(--color-text-light);
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    position: relative;
}

.search-button:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-light);
}

/* 搜索弹窗样式 */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s ease;
}

.search-overlay.active {
    visibility: visible;
    opacity: 1;
}

.search-popup {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 600px;
    width: 90%;
    max-height: 400px;
    overflow: hidden;
    transform: scale(0.8);
    transition: all 0.3s ease;
}

.search-overlay.active .search-popup {
    transform: scale(1);
}

.search-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: var(--color-primary);
    color: white;
}

.search-header h3 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}

.search-close {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.search-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.search-content {
    padding: 30px;
}

.search-input-container {
    display: flex;
    gap: 15px;
    align-items: center;
}

.search-input {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
}

.search-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 155, 123, 0.1);
}

.search-submit {
    padding: 15px 25px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.search-submit:hover {
    background: var(--color-tech-blue);
    transform: translateY(-2px);
}

.search-submit i {
    font-size: 14px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .search-popup {
        width: 95%;
        margin: 20px;
    }
    
    .search-header {
        padding: 15px 20px;
    }
    
    .search-content {
        padding: 20px;
    }
    
    .search-input-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .search-input,
    .search-submit {
        width: 100%;
    }
}

/* 移动端专用导航布局 */
.mobile-nav-layout {
    display: none;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0 20px;
}

.mobile-logo {
    flex: 0 0 auto;
}

.mobile-logo img {
    height: 35px;
    transition: transform 0.3s ease;
}

.mobile-search-button {
    background: none;
    border: none;
    color: var(--color-text-light);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all 0.3s ease;
    z-index: 1001;
}

.mobile-search-button:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

.mobile-menu-toggle {
    background: none;
    border: none;
    color: var(--color-text-light);
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: all 0.3s ease;
    z-index: 1001;
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.05);
}

.header-nav.scrolled .mobile-menu-toggle,
.header-nav.scrolled .mobile-search-button {
    color: var(--color-text-light);
}

/* 桌面端移动菜单按钮 */
.desktop-mobile-toggle {
    display: none;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

/* 移动端菜单样式 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 280px;
    height: 100vh;
    background: linear-gradient(135deg, var(--color-primary), #0f2341);
    z-index: 1001;
    transition: right 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    padding: 20px 0;
    box-shadow: -5px 0 25px rgba(0, 0, 0, 0.3);
    border-left: 1px solid rgba(201, 163, 91, 0.2);
}

.mobile-menu.active {
    right: 0;
}

.mobile-nav-item {
    margin: 5px 20px;
    position: relative;
}

.mobile-nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 10%;
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.mobile-nav-item:last-child::after {
    display: none;
}

.mobile-nav-link {
    display: block;
    color: var(--color-text-light);
    text-decoration: none;
    padding: 16px 20px;
    font-size: 18px;
    font-weight: 500;
    border-radius: 10px;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    font-family: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
}

.mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: #005F8E;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: linear-gradient(135deg, var(--color-tech-blue), #005F8E);
    color: var(--color-text-light);
    transform: translateX(8px);
}

.mobile-nav-link:hover::after,
.mobile-nav-link.active::after {
    width: 100%;
    background: var(--color-text-light);
}

.mobile-nav-link.active {
    background: linear-gradient(135deg, var(--color-tech-blue), #005F8E);
    color: var(--color-text-light);
    transform: translateX(8px);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(3px);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .nav-container {
        padding: 0;
    }

    /* 隐藏桌面端导航元素 */
    .logo.desktop-only,
    .search-button.desktop-only,
    .nav-center,
    .nav-right {
        display: none;
    }

    /* 显示移动端专用导航 */
    .mobile-nav-layout {
        display: flex;
    }

    .desktop-mobile-toggle {
        display: block;
    }
}

@media (max-width: 768px) {
    .mobile-nav-layout {
        padding: 0 15px;
    }
    
    .mobile-logo img {
        height: 32px;
    }
    
    .mobile-search-button,
    .mobile-menu-toggle {
        font-size: 18px;
        padding: 6px;
    }
    
    .mobile-menu {
        width: 280px;
    }
}

@media (max-width: 480px) {
    .mobile-menu {
        width: 100%;
        right: -100%;
        padding: 70px 20px 20px;
    }
}

/* 桌面端专用样式 */
.desktop-only {
    display: block;
}

/* 页脚样式 */
.footer {
    background: var(--color-primary);
    color: #FFFFFF;
    padding: 20px 0 0;
    position: relative;
    overflow: hidden;
}

/* footer 区域样式 */

/* footer 内容区样式 */
.footer-content-section {
    background: var(--color-primary);
    padding: 15px 0; /* 减少上下内边距 */
   
}

.footer-content-container {
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 30px;
}

.footer-column {
    flex: 1;
    min-width: 0;
}

.footer-column-title {
    color: var(--color-text-light);
    font-size: 1.2rem; /* 缩小标题文字 */
    font-weight: 600;
    margin-bottom: 20px; /* 减少下方间距 */
    position: relative;
    padding-bottom: 8px; /* 减少底部填充 */
}

.footer-column-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-text-light);
}

/* 联系方式样式 */
.contact-info .contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px; /* 减少间距 */
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem; /* 缩小文字 */
}

.contact-info .contact-item i {
    width: 16px; /* 缩小图标宽度 */
    margin-right: 10px; /* 减少间距 */
    font-size: 14px; /* 缩小图标 */
    color: var(--color-text-light);
}

/* 二维码样式 */
.qr-codes .qr-container {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.qr-item {
    text-align: center;
    flex: 1;
}

.qr-item img {
    width: 90px; /* 缩小二维码图片 */
    height: 90px; /* 缩小二维码图片 */
    border-radius: 6px;
    margin-bottom: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2); /* 减少边框 */
}

.qr-label {
    font-size: 0.85rem; /* 缩小二维码标签文字 */
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

/* 导航链接样式 */
.footer-nav-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.footer-nav-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem; /* 缩小导航链接文字 */
    transition: all 0.3s ease;
    padding: 4px 0; /* 减少内边距 */
    white-space: nowrap;
}

.footer-nav-link:hover {
    color: var(--color-text-light);
    transform: translateX(5px);
}

/* 分隔线样式 */
.footer-divider {
    width: 1px;
    background: rgba(255, 255, 255, 0.2);
    margin: 0 15px;
    align-self: stretch;
}

/* 版权区样式 */
.footer-copyright {
    background: var(--color-primary);
    padding: 12px 0; /* 减少版权区域的上下内边距 */
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.copyright-container {
    display: flex;
    justify-content: center; /* 修改为居中对齐 */
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.copyright-text {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.85rem; /* 缩小版权文字 */
    text-align: center; /* 添加文本居中对齐 */
    width: 100%; /* 确保宽度占满容器 */
}

.copyright-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.85rem; /* 缩小版权链接文字 */
    transition: color 0.3s ease;
}

.copyright-link:hover {
    color: var(--color-text-light);
}

.copyright-divider {
    color: rgba(255, 255, 255, 0.5);
}

/* ==================== 响应式设计 ==================== */

/* 1366px 笔记本适配 */
@media (max-width: 1366px) {
    .footer-content-container {
        gap: 20px;
    }
    
    .footer-nav-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .qr-item img {
        width: 110px;
        height: 110px;
    }
}

/* 平板适配 */
@media (max-width: 992px) {
    .footer-content-container {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-divider {
        width: 100%;
        height: 1px;
        margin: 20px 0;
    }
    
    .footer-column {
        width: 100%;
    }
    
    .qr-container {
        justify-content: flex-start;
    }
    
    .copyright-container {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
}

/* 手机适配 */
@media (max-width: 768px) {
    .footer-logo-section {
        padding: 20px 0;
    }
    
    .footer-main-logo {
        height: 40px;
    }
    
    .footer-slogan {
        font-size: 1.2rem;
        letter-spacing: 1px;
    }
    
    .footer-content-section {
        padding: 30px 0;
    }
    
    .footer-column-title {
        font-size: 1.3rem;
        margin-bottom: 20px;
    }
    
    .footer-nav-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    
    .footer-nav-link {
        font-size: 1rem;
    }
    
    .qr-item img {
        width: 100px;
        height: 100px;
    }
    
    .contact-item {
        font-size: 1rem;
    }
    
    .copyright-text,
    .copyright-link {
        font-size: 1rem;
    }
}

/* 小屏手机适配 */
@media (max-width: 480px) {
    .footer-nav-grid {
        grid-template-columns: 1fr;
    }
    
    .qr-container {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .qr-item {
        text-align: center;
    }
    
    .footer-main-logo {
        height: 35px;
    }
    
    .footer-slogan {
        font-size: 1.1rem;
    }
}

/* 超小屏适配 */
@media (max-width: 360px) {
    .footer-content-container {
        padding: 0 15px;
    }
    
    .footer-column-title {
        font-size: 1.2rem;
    }
    
    .footer-nav-link {
        font-size: 0.9rem;
    }
    
    .contact-item {
        font-size: 0.95rem;
    }
    
    .qr-item img {
        width: 90px;
        height: 90px;
    }
    
    .copyright-text,
    .copyright-link {
        font-size: 0.95rem;
    }
}