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

/* 导航栏高度 CSS 变量（由 base.html JS 动态更新）
   默认 96px = logo 60px + 上下内边距各 1rem(16px), 接近实际导航高度 */
:root { --nav-h: 96px; }

body {
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    font-size: 16px;
    /* 顶部留白由 #navShim 元素第步处理，此处不需要 padding */
}

/* 导航栏样式：Grid 三列布局，中间功能区永远居中 */
nav {
    display: grid;
    grid-template-columns: 1fr auto 1fr;  /* 左列(logo)和右列(user-actions)各占相等弹性空间 */
    align-items: center;
    padding: 0.7rem 1.5rem;
    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;
    justify-content: center;  /* Grid 中列内内容居中 */
    gap: clamp(4px, 0.8vw, 16px);
    flex-wrap: nowrap;
}

.nav-item {
    text-decoration: none;
    color: #333;
    font-size: 22px;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
    white-space: nowrap;
}

.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-self: end;   /* Grid 中靠右对齐 */
    flex-shrink: 0;
}

/* 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: 0;  /* body padding-top 已处理导航栏偏移 */
    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: 20px;   /* body padding-top 已处理导航栏偏移，此处仅保留 20px 呼吸感 */
    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;
    }
}

/* 手机导航栏优化：二行布局，第一行 logo+user-actions，第二行 nav-links 可横滚 */
@media (max-width: 600px) {
    nav, .header {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        padding: 0.35rem 0.6rem;
        gap: 0;
    }
    .logo {
        order: 1;         /* 行1左 */
        flex: 1;
        min-width: 0;
    }
    .logo img {
        height: 40px;
    }
    .user-actions {
        order: 2;         /* 行1右（HTML 虽在 nav-links 后，order 让它先渲染） */
        flex: 0 0 auto;
        gap: 0;
        justify-self: unset;
    }
    .user-actions .search-btn,
    .user-actions .username,
    .logout-btn {
        padding: 4px 6px;
        font-size: 13px;
    }
    .nav-links {
        order: 3;         /* 行2：独占整行，横向可滚动 */
        flex: 0 0 100%;
        width: 100%;
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        justify-content: flex-start;
        gap: 0;
        padding-bottom: 2px;
    }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-item {
        font-size: 15px;
        padding: 0.25rem 8px;
        white-space: nowrap;
        flex-shrink: 0;
    }
}



/* 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); }
}