/* 全局变量 */
:root {
    --primary-color: #ff0000;
    --secondary-color: #0056a4;
    --accent-color: #f39c12;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --border-color: #e0e0e0;
    --transition-speed: 0.3s;
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Helvetica, 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

.container {
    width: 1200px;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    text-decoration: none;
    color: var(--text-color);
    transition: all var(--transition-speed) ease;
}

ul {
    list-style: none;
}

.btn {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--accent-color);
    color: #fff;
    border-radius: 4px;
    transition: all var(--transition-speed) ease;
}

.btn:hover {
    background-color: #e67e22;
}

/* 头部区域样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
}

/* 导航菜单 */
.logo img {
    max-height: 40px;
    max-width: 160px;
}

.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.main-menu {
    display: flex;
}

.main-menu li {
    margin: 0 15px;
    position: relative;
}

.main-menu li a {
    font-size: 16px;
    font-weight: 600; /* 将字体粗细从500增加到600 */
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 10px 0;
    display: block;
}

.main-menu li a:hover,
.main-menu li.active a {
    color: var(--primary-color);
}

/* 添加红色下划线指示当前页面 */
.main-menu li.active a:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

/* 语言切换器 */
.language-switcher {
    margin-left: 20px;
    font-size: 14px;
    white-space: nowrap;
}

.language-switcher a {
    color: var(--text-color);
    padding: 5px;
    transition: color var(--transition-speed);
    display: inline-block;
}

.language-switcher a:hover,
.language-switcher a.active {
    color: var(--primary-color);
}

/* 页脚样式 */
footer {
    background-color: var(--light-gray);
    color: var(--text-color);
}

.footer-top {
    background-color: #fff;
    padding: 15px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.footer-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-top .logo img {
    max-height: 40px;
}

.social-icons {
    display: flex;
    gap: 10px;
}

.social-icon img {
    width: 24px;
    height: 24px;
    opacity: 0.7;
    transition: opacity var(--transition-speed);
}

.social-icon:hover img {
    opacity: 1;
}

/* 微信二维码弹出样式 */
.social-icon.wechat-icon {
    position: relative;
}

.qrcode-popup {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #4CAF50;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    display: none;
    width: 200px;
    z-index: 1000;
}

.qrcode-popup img {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 10px;
}

.qrcode-popup p {
    color: white;
    text-align: center;
    margin: 0;
    font-size: 10px;
}

.social-icon.wechat-icon:hover .qrcode-popup {
    display: block;
}

.back-to-top {
    background-color: var(--primary-color);
    padding: 5px 10px;
    border-radius: 3px;
}

.back-to-top a {
    color: #fff;
    font-size: 12px;
    font-weight: bold;
    text-decoration: none;
}

/* 页脚导航 */
.footer-main {
    padding: 40px 0;
}

.footer-nav {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.footer-nav-column {
    flex: 1;
    min-width: 160px;
    margin-bottom: 20px;
}

.footer-nav-column h3 {
    font-size: 14px;
    margin-bottom: 15px;
    font-weight: 600;
    color: var(--text-color);
}

.footer-nav-column ul li {
    margin-bottom: 8px;
}

.footer-nav-column ul li a {
    color: #666;
    font-size: 12px;
    transition: color var(--transition-speed);
}

.footer-nav-column ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    background-color: var(--border-color);
    padding: 15px 0;
    text-align: center;
    font-size: 12px;
    color: #666;
}

.footer-bottom p {
    margin: 5px 0;
}

/* 响应式调整 */
@media (max-width: 992px) {
    .footer-nav-column {
        flex: 0 0 33.33%;
    }
}

@media (max-width: 768px) {
    .footer-top .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .footer-nav-column {
        flex: 0 0 50%;
    }
    
    header .container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .logo {
        margin-bottom: 15px;
    }
    
    .main-menu {
        display: none;
        width: 100%;
        flex-direction: column;
    }
    
    .main-menu.active {
        display: flex;
    }
    
    .main-menu li {
        margin: 0;
        padding: 10px 0;
        border-bottom: 1px solid #eee;
    }
    
    .mobile-menu-toggle {
        display: flex;
        position: absolute;
        top: 25px;
        right: 15px;
    }
}

@media (max-width: 576px) {
    .footer-nav-column {
        flex: 0 0 100%;
    }
}