/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 15px;
}

@media(min-width: 2000px) {
    .container {
        max-width: 1800px;
    }
}

/* 页眉样式 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.top-bar {
    background-color: #f8f8f8;
    padding: 8px 0;
    font-size: 14px;
    color: #666;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 100%;
    padding: 0 40px;
}

.top-left span {
    font-weight: 500;
}

.social-icons a {
    color: #666;
    margin-left: 15px;
    font-size: 18px;
    transition: color 0.3s;
    position: relative;
    display: inline-block;
}

.social-icons a:hover {
    color: #4CAF50;
}

.social-icons .hover-img {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: auto;
    z-index: 1000;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-top: 8px;
}

.social-icons a:hover .hover-img {
    display: block;
}

.main-header {
    padding: 20px 0;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 100%;
    padding: 0 40px;
}

.nav-menu {
    flex-shrink: 0;
}

.logo img {
    height: 60px;
    width: auto;
}

.logo a {
    display: inline-block;
    text-decoration: none;
}

.nav-menu ul {
    display: flex;
    list-style: none;
}

.nav-menu li {
    margin-left: 20px;
}

.nav-menu li:first-child {
    margin-left: 0;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-size: 22px;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #4CAF50;
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #4CAF50;
}

/* 轮播图样式 */
.slider {
    position: relative;
    height: 600px;  /* 添加这一行 */
    overflow: hidden;
    margin-bottom: 20px;
}

@supports (aspect-ratio: 1 / 1) {
    .slider {
        height: auto;
        aspect-ratio: 8 / 3;
    }
}

.slides {
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.slide.active {
    opacity: 1;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}



.slider-controls {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    transform: translateY(-50%);
    padding: 0 15px;
}

.slider-controls button {
    background-color: rgba(255, 255, 255, 0.8);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 20px;
    color: #333;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slider-controls button:hover {
    background-color: #4CAF50;
    color: white;
}

.slider-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: background-color 0.3s;
}

.indicator.active {
    background-color: #4CAF50;
}



/* 页脚样式 */
.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section {
    flex: 1;
    min-width: 250px;
}

.footer-section h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #4CAF50;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background-color: #4CAF50;
}

.contact-info p {
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
}

.contact-info i {
    margin-right: 10px;
    color: #4CAF50;
    width: 20px;
    text-align: center;
}

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

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

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: #4CAF50;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: #ecf0f1;
    font-size: 18px;
    transition: all 0.3s;
}

.social-links a:hover {
    background-color: #4CAF50;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    color: #95a5a6;
}

.footer-bottom a{
    color: #95a5a6;
    text-decoration: none;
}


/* 汉堡菜单按钮 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 22px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: #333;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(9.5px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-9.5px) rotate(-45deg);
}

/* 响应式设计 */

/* 宽屏适配 */
@media (min-width: 1400px) {
    .top-bar .container,
    .main-header .container {
        padding: 0 60px;
    }
}

@media (min-width: 1800px) {
    .top-bar .container,
    .main-header .container {
        padding: 0 100px;
    }
}
/* 平板横屏及以下 */
@media (max-width: 1024px) {
    .nav-menu li {
        margin-left: 15px;
    }

    .nav-menu a {
        font-size: 18px;
    }

    /* .slider {
        height: 500px;
    } 
    @supports (aspect-ratio: 1 / 1) {
        .slider {
            height: auto;
            aspect-ratio: 8 / 3;
        }
    } */

}

/* 页脚响应式 - 修复三列变单列问题 */
@media (max-width: 900px) {
    .footer-section {
        flex: 1 1 calc(33.33% - 40px);
        min-width: 200px;
    }
}

/* 平板竖屏及以下 */
@media (max-width: 768px) {
    .top-bar .container,
    .main-header .container {
        padding: 0 20px;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .main-header .container {
        flex-wrap: wrap;
    }

    .nav-menu {
        display: none;
        width: 100%;
        flex-basis: 100%;
        padding-top: 15px;
    }

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

    .nav-menu ul {
        flex-direction: column;
        width: 100%;
    }

    .nav-menu li {
        margin-left: 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: 12px 0;
        font-size: 16px;
    }

    .nav-menu a.active::after {
        bottom: auto;
        top: 50%;
        left: -15px;
        width: 3px;
        height: 60%;
        transform: translateY(-50%);
    }

    /* .slider {
        height: 350px;
    } 
    @supports (aspect-ratio: 1 / 1) {
        .slider {
            height: auto;
            aspect-ratio: 8 / 3;
        }
    } */

    .slider-controls button {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }

    .slider-indicators {
        bottom: 15px;
        gap: 8px;
    }

    .indicator {
        width: 10px;
        height: 10px;
    }

    /* 页脚 - 保持三列，文字缩小 */
    .footer {
        padding: 40px 0 20px;
    }
    
    .footer-content {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 20px;
        margin-bottom: 30px;
    }
    
    .footer-section {
        flex: 0 0 calc(33.33% - 14px);
        min-width: 0;
        text-align: left;
    }
    
    .footer-section h3 {
        font-size: 16px;
        margin-bottom: 12px;
    }
    
    .footer-section h3::after {
        left: 0;
        transform: none;
        width: 40px;
    }
    
    .contact-info p {
        justify-content: flex-start;
        font-size: 12px;
    }
    
    .footer-section ul li a {
        font-size: 12px;
    }
    
    .social-links {
        justify-content: flex-start;
    }
    
    .footer-bottom {
        font-size: 11px;
        padding-top: 15px;
    }

    .top-bar {
        font-size: 12px;
        padding: 6px 0;
    }

    .social-icons a {
        font-size: 16px;
        margin-left: 10px;
    }

    .logo img {
        height: 50px;
    }

    .main-header {
        padding: 15px 0;
    }
}
/* 小屏手机变成单列 */
@media (max-width: 480px) {
    .footer-section {
        flex: 1 1 100%;
    }
}
/* 大屏手机及以下 */
@media (max-width: 576px) {
    .container {
        padding: 0 10px;
    }
    .slider{
        margin-bottom: 5px;
    }

    .top-bar .container,
    .main-header .container {
        padding: 0 15px;
    }

     /* .slider {
        height: 250px;
    } 
    @supports (aspect-ratio: 1 / 1) {
        .slider {
            height: auto;
            aspect-ratio: 8 / 3;
        }
    } */

    .slider-controls button {
        width: 30px;
        height: 30px;
        font-size: 12px;
    }

    .slider-indicators {
        bottom: 10px;
        gap: 6px;
    }

    .indicator {
        width: 8px;
        height: 8px;
    }

    .top-bar .container {
        flex-direction: column;
        gap: 5px;
        text-align: center;
    }

    /* 页脚变成单列 */
    .footer {
        padding: 30px 0 15px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 25px;
        margin-bottom: 25px;
    }
    
    .footer-section {
        flex: 1;
        width: 100%;
        text-align: center;
        min-width: auto;
    }
    
    .footer-section h3 {
        font-size: 16px;
        margin-bottom: 12px;
    }
    
    .footer-section h3::after {
        left: 50%;
        transform: translateX(-50%);
        width: 40px;
    }
    
    .contact-info p {
        justify-content: center;
        font-size: 13px;
    }
    
    .footer-section ul li a {
        font-size: 13px;
    }
    
    .social-links {
        justify-content: center;
    }

    .logo img {
        height: 40px;
    }

    .main-header {
        padding: 10px 0;
    }

    .nav-menu a {
        font-size: 15px;
        padding: 10px 0;
    }
}

/* 小屏手机 */
@media (max-width: 375px) {
     /* .slider {
        height: 200px;
    } 
    @supports (aspect-ratio: 1 / 1) {
        .slider {
            height: auto;
            aspect-ratio: 8 / 3;
        }
    } */
    .nav-menu a {
        font-size: 14px;
        padding: 8px 0;
    }

    .logo img {
        height: 36px;
    }
}

/* 移动端侧边栏垂直导航（用于 intro.html 等页面） */
@media (max-width: 768px) {
    .sidebar {
        flex: 0 0 auto !important;
        width: 100% !important;
    }

    .sidebar-nav {
        overflow: visible !important;
        border-radius: 0 !important;
        position: static !important;
    }

    .sidebar-nav > ul {
        display: flex;
        flex-wrap: wrap;
    }

    .sidebar-nav > ul > li {
        flex-shrink: 0;
        border-bottom: none !important;
    }

    .sidebar-nav > ul > li > a {
        padding: 10px 16px !important;
        font-size: 14px;
    }

    .sidebar-nav > ul > li > a.active {
        background-color: #4CAF50;
        color: white;
    }

    .sidebar-nav > ul > li > a.active::after {
        display: none;
    }
}

@media (max-width: 576px) {
    .sidebar-nav > ul > li > a {
        padding: 8px 12px !important;
        font-size: 13px !important;
    }
    /* 隐藏快速链接区域 */
    .footer-section:nth-child(2) {
        display: none;
    }
}


.logo {
    height: 60px;
  }