/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

/* 容器 */
.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 主内容区域的容器样式 */
.material-main .container {
    max-width: 1560px;
    display: flex;
    gap: 80px;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
}

/* 顶部导航栏 */
.navbar {
    background: #C6AA76 !important;
    padding: 0;
    position: relative;
    width: 100%;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.brand-logo {
    height: 30px;
    max-width: 200px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    margin: 0;
}

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

.nav-link {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    min-width: 150px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    list-style: none;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
}

.dropdown-menu a:hover {
    background-color: #f5f5f5;
    color: #C6AA76;
}

.dropdown-menu .active {
    background-color: #C6AA76;
    color: #fff !important;
}

/* 导航控制 */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.music-toggle {
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.music-toggle:hover {
    color: #f0f0f0;
}

.language-switch {
    color: #fff;
    font-size: 14px;
}

.language-switch .active {
    font-weight: bold;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #fff;
    margin: 3px 0;
    transition: 0.3s;
}

/* 激活状态 */
.dropdown.active .nav-link,
.nav-menu .active .nav-link {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 右侧材料导航（暂时隐藏，因为设计图中没有） */
.material-nav {
    display: none;
}

/* 主要内容区域 */
.material-main {
    padding: 80px 0;
    min-height: calc(100vh - 150px);
    background: linear-gradient(to right, #ffffff 0%, #ffffff calc(50% - 780px), #f5f5f5 calc(50% - 780px), #f5f5f5 calc(50% + 780px), #ffffff calc(50% + 780px), #ffffff 100%);
    margin-top: 80px;
}

/* 左侧内容区域 */
.material-content {
    flex: 1;
    max-width: 600px;
}

/* 标题 */
.material-title {
    font-size: 36px;
    font-weight: bold;
    color: #C6AA76;
    margin-bottom: 10px;
    line-height: 1.2;
}

/* 副标题 */
.material-subtitle {
    font-size: 24px;
    font-weight: bold;
    color: #C6AA76;
    margin-bottom: 20px;
}

/* 介绍文字 */
.material-intro {
    margin-bottom: 30px;
}

.material-intro p {
    font-size: 18px;
    color: #999;
    line-height: 1.6;
    margin: 0 0 12px 0;
}

/* 特性区块 */
.feature-section {
    margin-bottom: 30px;
}

.feature-section h3 {
    font-size: 18px;
    font-weight: bold;
    color: #666;
    margin-bottom: 15px;
    line-height: 1.4;
    letter-spacing: 3px;
}

/* 特性列表 */
.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    font-size: 14px;
    color: #999;
    line-height: 1.6;
    margin-bottom: 12px;
    padding-left: 20px;
    position: relative;
}

.feature-list li::before {
    content: "●";
    color: #C6AA76;
    font-weight: bold;
    position: absolute;
    left: 0;
    top: 2px;
}

/* 冒号前的文字加粗 */
.feature-list li strong {
    font-weight: bold;
    color: #666;
}

/* 右侧图片区域 */
.material-image-section {
    flex: 1;
    max-width: 500px;
}

.material-image-container {
    width: 100%;
    height: auto;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.material-photo {
    width: 100%;
    height: auto;
    object-fit: contain;
    display: block;
}

/* 底部标语区域 */
.bottom-slogan-section {
    background-color: #fff;
    padding: 80px 0;
    text-align: center;
}

.bottom-slogan-image {
    max-width: 200px;
    width: auto;
    height: auto;
    object-fit: contain;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .material-main {
        padding: 120px 0 60px 0;
    }
    
    .material-main .container {
        gap: 60px;
        padding: 40px 20px;
    }
    
    .material-title {
        font-size: 40px;
    }
    
    .material-image-container {
        height: 500px;
    }
}

@media (max-width: 768px) {
    .material-main {
        padding: 100px 0 60px 0;
        background: #f5f5f5;
    }
    
    .material-main .container {
        flex-direction: column;
        gap: 40px;
        padding: 30px 20px;
        align-items: flex-start;
    }
    
    .material-content {
        max-width: 100%;
    }
    
    .material-image-section {
        max-width: 100%;
    }
    
    .material-image-container {
        height: 400px;
    }
    
    .material-title {
        font-size: 36px;
    }
    
    .feature-section h3 {
        font-size: 18px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
}

@media (max-width: 480px) {
    .material-main {
        padding: 80px 0 40px 0;
    }
    
    .material-main .container {
        padding: 20px;
        gap: 30px;
    }
    
    .material-title {
        font-size: 32px;
    }
    
    .material-intro p {
        font-size: 14px;
    }
    
    .feature-list li {
        font-size: 14px;
    }
    
    .material-image-container {
        height: 300px;
    }
}  

.music-control {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.music-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
    filter: brightness(0) invert(1); /* 将图标变为白色 */
}

.music-icon.rotating {
    animation: rotate 2s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}