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

body {
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    font-size: 16px;
}

/* 导航栏样式 */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
}

/* Logo图片的样式 */
.logo img {
    height: 60px;    /* 图片高度，根据导航栏高度调整 */
    width: auto;     /* 宽度自动，保持图片比例 */
    vertical-align: middle;    /* 图片垂直居中对齐 */
    transition: opacity 0.3s;    /* 添加悬停效果的过渡动画 */
}

.logo2 {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
}

/* Logo图片的样式 */
.logo2 img {
    height: 100px;    /* 图片高度，根据导航栏高度调整 */
    width: auto;     /* 宽度自动，保持图片比例 */
    vertical-align: middle;    /* 图片垂直居中对齐 */
    margin-left: 30px;          /* 方法1：使用margin */
    transition: opacity 0.3s;    /* 添加悬停效果的过渡动画 */
}

/* Logo链接的悬停效果 */
.logo a:hover img {
    opacity: 0.8;    /* 悬停时图片透明度变化 */
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-item {
    text-decoration: none;
    color: #333;
    font-size: 1.8rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-item:hover {
    background-color: #f5f5f5;
    color: #007bff;
}

.nav-item.active {
    color: #007bff;
    font-weight: bold;
}

.user-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: flex-end;  /* 右对齐 */
    flex-shrink: 0;  /* 防止 user-actions 被压缩 */
}

/* 搜索按钮样式移到这里并修改 */
.user-actions .search-btn {
    background: none;
    border: none;
    color: #333;
    font-size: 1em;
    cursor: pointer;
    padding: 8px 8px;
    display: inline;
    white-space: nowrap;
    border-radius: 8px;
    flex-shrink: 0;
    width: auto;
    box-sizing: content-box;
}

.user-actions .search-btn:hover {
    background-color: #f5f5f5;
    color: #007bff;
}

.user-actions .username {
    color: #333;
    cursor: pointer;
    text-decoration: none;
    padding: 8px 8px;
    white-space: nowrap;  /* 防止文字换行 */
    border-radius: 8px;
    flex-shrink: 0;  /* 防止被压缩 */
}

.user-actions .username:hover {
    background-color: #f5f5f5;
    color: #007bff;
}

/* 主要内容区域 */
.main-content {
    margin-top: 80px;
    padding: 2rem;
    width: 100%;
    max-width: 1800px;  /* 增加最大宽度 */
    margin-left: auto;
    margin-right: auto;
}

/* 认证表单样式 */
.auth-container {
    max-width: 400px;
    margin-top: 100px;  /* 改用 margin-top 代替 top */
    margin-left: auto;
    margin-right: auto; 
    padding: 2rem;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.auth-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #666;
}

.form-group input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: #007bff;
}

button {
    width: 100%;
    padding: 0.75rem;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

.auth-links {
    text-align: center;
    margin-top: 1rem;
}

.auth-links a {
    color: #007bff;
    text-decoration: none;
}

/* 警告消息样式 */
.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    background-color: #f8d7da;
    color: #721c24;
    text-align: center;
}

/* 页面容器样式 */
.page-container {
    width: 100%;
    max-width: 1800px;  /* 增加最大宽度 */
    margin: 0 auto;
    padding: 2rem;
}

.content-section {
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

/* 个人中心样式 */
.profile-container {
    width: 100%;
    max-width: 1800px;
    margin: 0 auto;
    padding: 2rem;
}

.profile-content {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    padding: 2rem;
}

.profile-info {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

/* 修改为纵向布局 */
.profile-sections {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.section {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    width: 100%;
}

/* 视频和帖子列表样式优化 */
.video-list, .post-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.video-item {
    background-color: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.video-item .thumbnail {
    width: 100%;
    height: 160px;
    background-color: #eee;
    object-fit: cover;
}

.video-item .content {
    padding: 1rem;
}

.video-item h4 {
    color: #333;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.video-item p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.4;
}

/* 帖子项样式 */
.post-item {
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.post-item h4 {
    color: #333;
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
}

.post-item p {
    color: #666;
    font-size: 1rem;
    line-height: 1.6;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .main-content,
    .page-container,
    .profile-container {
        padding: 1rem;
    }
    
    .video-list, .post-list {
        grid-template-columns: 1fr;
    }
}



/* Flash ��Ϣ��ʾ��ʽ */
.flashes {
    position: fixed;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    width: 90%;
    max-width: 500px;
}

.flash-message {
    background-color: #ff4444;
    color: #fff;
    padding: 12px 20px;
    border-radius: 6px;
    margin-bottom: 8px;
    font-size: 1rem;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to   { opacity: 1; transform: translateY(0); }
}