/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #2E7D32 70%, #F5F5F5 30%);
    color: #333333;
    line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(46, 125, 50, 0.9);
    padding: 20px 40px;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.navbar a {
    color: #FFFFFF;
    text-decoration: none;
    margin: 0 15px;
    font-size: 16px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #FFC107;
}

/* 主内容区样式 */
.main {
    padding: 100px 20px 50px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

/* 标题样式 */
h1, h2, h3, h4 {
    color: #2E7D32;
    margin-bottom: 20px;
}

h1 {
    font-size: 36px;
    text-align: center;
}

h2 {
    font-size: 28px;
}

h3 {
    font-size: 24px;
}

/* 段落样式 */
p {
    font-size: 16px;
    margin-bottom: 20px;
}

/* 代码块样式 */
pre {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
}

code {
    font-family: 'Courier New', Courier, monospace;
    color: #d63384;
}

/* 提示信息样式 */
.highlight-text {
    font-size: 18px;
    color: #FFC107;
    text-align: center;
    margin: 40px 0;
}

/* 图片样式 */
img.decorative {
    width: 100%;
    max-width: 320px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img.decorative:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

/* 网格布局 */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    background-color: #2196F3;
    color: #FFFFFF;
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    text-decoration: none;
}

.btn:hover {
    background: linear-gradient(45deg, #2196F3, #FFC107);
    transform: translateY(-2px);
}

/* 导航下拉菜单 */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #2E7D32;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    color: #FFFFFF;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s ease;
}

.dropdown-content a:hover {
    background-color: #1B5E20;
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* 关键帧动画 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 2s ease-in-out;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .navbar a {
        margin: 10px 0;
    }
    .grid-container {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .grid-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 折叠区域样式 */
.collapsible {
    background-color: #2E7D32;
    color: white;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 18px;
    border-radius: 5px;
    margin-bottom: 10px;
    transition: background-color 0.3s ease;
}

.collapsible:hover {
    background-color: #1B5E20;
}

.content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: #f1f1f1;
    border-radius: 5px;
}

/* 实时聊天窗口样式 */
.chat-window {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 300px;
    height: 400px;
    background-color: #FFFFFF;
    border: 1px solid #2196F3;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    display: none;
    flex-direction: column;
    z-index: 1001;
}

.chat-window.active {
    display: flex;
}

.chat-header {
    background-color: #2196F3;
    color: #FFFFFF;
    padding: 10px;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    font-size: 18px;
}

.chat-body {
    flex: 1;
    padding: 10px;
    overflow-y: auto;
}

.chat-input {
    padding: 10px;
    border-top: 1px solid #F5F5F5;
}

.chat-input input {
    width: 100%;
    padding: 8px;
    border: 1px solid #CCCCCC;
    border-radius: 4px;
}

/* 多语言切换器样式 */
.language-switcher {
    position: relative;
    display: inline-block;
}

.language-switcher select {
    padding: 10px;
    border: none;
    border-radius: 4px;
    background-color: #FFFFFF;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.language-switcher:hover select {
    transform: scale(1.05);
}