/**
 * Yes主题样式 - 百度百科风格
 * 模仿 baike.baidu.com 的百科式排版
 * 信息密度高、结构清晰、蓝色主调
 */

/* ========== CSS变量 ========== */
:root {
    --bk-blue: #3388FF;
    --bk-blue-dark: #2b6ed9;
    --bk-blue-light: #e8f0fe;
    --bk-blue-bg: #f5f8ff;
    --bk-orange: #FF6A00;
    --bk-text: #333333;
    --bk-text-secondary: #666666;
    --bk-text-muted: #999999;
    --bk-border: #E5E5E5;
    --bk-bg: #f5f5f5;
    --bk-white: #ffffff;
    --bk-shadow: 0 1px 4px rgba(0,0,0,0.08);
    --bk-radius: 4px;
    --container-width: 1200px;
    --header-height: 56px;
}

/* ========== 全局重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--bk-text);
    background: var(--bk-bg);
}

a {
    color: var(--bk-blue);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--bk-blue-dark);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

/* ========== 容器 ========== */
.bk-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 16px;
}

/* ========== 顶部导航栏 ========== */
.bk-header {
    background: var(--bk-blue);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 1050;
    box-shadow: 0 2px 8px rgba(51,136,255,0.15);
}

.bk-header .container {
    display: flex;
    align-items: center;
    height: 100%;
}

.bk-header-inner {
    display: flex;
    align-items: center;
    height: var(--header-height);
}

.bk-logo {
    display: flex;
    align-items: center;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    text-decoration: none;
    margin-right: 32px;
    flex-shrink: 0;
    letter-spacing: 1px;
}

.bk-logo:hover {
    color: #fff;
    text-decoration: none;
}

.bk-logo img {
    max-height: 36px;
    margin-right: 8px;
}

/* 导航菜单 */
.bk-nav {
    display: flex;
    align-items: center;
    height: 100%;
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
}

.bk-nav-item {
    position: relative;
}

.bk-nav-link {
    display: flex;
    align-items: center;
    height: var(--header-height);
    padding: 0 16px;
    color: rgba(255,255,255,0.9);
    font-size: 14px;
    text-decoration: none;
    transition: background 0.2s;
    white-space: nowrap;
}

.bk-nav-link:hover {
    color: #fff;
    background: rgba(255,255,255,0.1);
    text-decoration: none;
}

.bk-nav-link.active {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

.bk-nav-link i {
    margin-right: 6px;
    font-size: 13px;
}

/* 导航下拉菜单 */
.bk-nav-dropdown {
    position: relative;
}

.bk-nav-dropdown .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    background: #fff;
    border-radius: var(--bk-radius);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    padding: 6px 0;
    z-index: 1100;
}

.bk-nav-dropdown:hover .dropdown-menu {
    display: block;
}

.bk-nav-dropdown .dropdown-item {
    display: block;
    padding: 8px 16px;
    color: var(--bk-text);
    font-size: 14px;
    text-decoration: none;
    transition: background 0.15s;
}

.bk-nav-dropdown .dropdown-item:hover {
    background: var(--bk-blue-light);
    color: var(--bk-blue);
    text-decoration: none;
}

/* 右侧工具区 */
.bk-header-tools {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.bk-search-box {
    position: relative;
}

.bk-search-box input {
    width: 240px;
    height: 34px;
    padding: 0 36px 0 14px;
    border: none;
    border-radius: 17px;
    font-size: 13px;
    outline: none;
    background: rgba(255,255,255,0.2);
    color: #fff;
    transition: all 0.2s;
}

.bk-search-box input::placeholder {
    color: rgba(255,255,255,0.6);
}

.bk-search-box input:focus {
    background: rgba(255,255,255,0.3);
    width: 280px;
}

.bk-search-box button {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border: none;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.bk-search-box button:hover {
    background: rgba(255,255,255,0.35);
}

.bk-user-btn {
    height: 32px;
    padding: 0 14px;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.5);
    background: transparent;
    color: #fff;
    font-size: 13px;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all 0.2s;
    white-space: nowrap;
}

.bk-user-btn:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
    text-decoration: none;
    border-color: rgba(255,255,255,0.7);
}

.bk-user-btn i {
    margin-right: 5px;
}

/* 用户下拉菜单 */
.bk-user-dropdown {
    position: relative;
}

.bk-user-dropdown .dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 180px;
    background: #fff;
    border-radius: var(--bk-radius);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    padding: 6px 0;
    z-index: 1100;
}

.bk-user-dropdown .dropdown-menu.show {
    display: block;
}

.bk-user-dropdown .dropdown-item {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    color: var(--bk-text);
    font-size: 14px;
    cursor: pointer;
    transition: background 0.15s;
}

.bk-user-dropdown .dropdown-item:hover {
    background: var(--bk-blue-light);
    color: var(--bk-blue);
}

.bk-user-dropdown .dropdown-item i {
    margin-right: 10px;
    width: 16px;
    text-align: center;
    color: var(--bk-text-muted);
}

.bk-user-dropdown .dropdown-item:hover i {
    color: var(--bk-blue);
}

.bk-user-dropdown .dropdown-divider {
    height: 1px;
    background: var(--bk-border);
    margin: 4px 0;
}

/* ========== 面包屑 ========== */
.bk-breadcrumb {
    padding: 12px 0;
    font-size: 13px;
    color: var(--bk-text-muted);
}

.bk-breadcrumb a {
    color: var(--bk-text-muted);
}

.bk-breadcrumb a:hover {
    color: var(--bk-blue);
}

.bk-breadcrumb .separator {
    margin: 0 6px;
    color: #ccc;
}

/* ========== 内容区域 ========== */
.bk-main {
    background: var(--bk-white);
    border-radius: var(--bk-radius);
    box-shadow: var(--bk-shadow);
    margin-bottom: 20px;
    overflow: hidden;
}

.bk-main-header {
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--bk-border);
}

.bk-main-body {
    padding: 20px 24px;
}

/* ========== 首页 - 模块卡片 ========== */
.bk-section {
    background: var(--bk-white);
    border-radius: var(--bk-radius);
    box-shadow: var(--bk-shadow);
    margin-bottom: 16px;
    overflow: hidden;
}

.bk-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--bk-border);
    background: var(--bk-white);
}

.bk-section-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--bk-text);
    display: flex;
    align-items: center;
}

.bk-section-title i {
    color: var(--bk-blue);
    margin-right: 8px;
    font-size: 15px;
}

.bk-section-title .badge-count {
    font-size: 12px;
    font-weight: 400;
    color: var(--bk-text-muted);
    margin-left: 8px;
}

.bk-section-more {
    font-size: 13px;
    color: var(--bk-text-muted);
}

.bk-section-more:hover {
    color: var(--bk-blue);
}

.bk-section-body {
    padding: 16px 20px;
}

/* ========== 文章列表项（百科风格） ========== */
.bk-article-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.bk-article-item {
    display: flex;
    padding: 14px 0;
    border-bottom: 1px solid #f0f0f0;
    transition: background 0.15s;
    gap: 16px;
}

.bk-article-item:last-child {
    border-bottom: none;
}

.bk-article-item:hover {
    background: var(--bk-blue-bg);
}

.bk-article-thumb {
    flex-shrink: 0;
    width: 160px;
    height: 100px;
    border-radius: var(--bk-radius);
    overflow: hidden;
}

.bk-article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.bk-article-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.bk-article-info h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--bk-text);
    margin-bottom: 6px;
    line-height: 1.5;
}

.bk-article-info h3 a {
    color: var(--bk-text);
}

.bk-article-info h3 a:hover {
    color: var(--bk-blue);
}

.bk-article-summary {
    font-size: 13px;
    color: var(--bk-text-secondary);
    line-height: 1.6;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.bk-article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--bk-text-muted);
    flex-wrap: wrap;
}

.bk-article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.bk-article-meta i {
    font-size: 11px;
}

.bk-article-meta a {
    color: var(--bk-text-muted);
}

.bk-article-meta a:hover {
    color: var(--bk-blue);
}

/* 标签 */
.bk-tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    background: var(--bk-blue-light);
    color: var(--bk-blue);
    text-decoration: none;
    margin-right: 6px;
    margin-bottom: 4px;
    transition: all 0.2s;
}

.bk-tag:hover {
    background: var(--bk-blue);
    color: #fff;
    text-decoration: none;
}

.bk-tag-danger {
    background: #fff1f0;
    color: #cf1322;
}

.bk-tag-warning {
    background: #fff7e6;
    color: #d46b08;
}

/* ========== 文章详情（百科风格） ========== */
.bk-detail {
    padding: 24px;
}

.bk-detail-header {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--bk-border);
}

.bk-detail-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--bk-text);
    line-height: 1.4;
    margin-bottom: 12px;
}

.bk-detail-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 13px;
    color: var(--bk-text-muted);
    flex-wrap: wrap;
}

.bk-detail-meta span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.bk-detail-meta i {
    font-size: 12px;
}

.bk-detail-meta a {
    color: var(--bk-text-muted);
}

.bk-detail-meta a:hover {
    color: var(--bk-blue);
}

/* 信息摘要卡片 */
.bk-summary-card {
    background: var(--bk-blue-bg);
    border: 1px solid #d4e5ff;
    border-radius: var(--bk-radius);
    padding: 20px 24px;
    margin-bottom: 24px;
    position: relative;
}

.bk-summary-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--bk-blue);
    border-radius: 4px 0 0 4px;
}

.bk-summary-card .summary-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--bk-blue);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
}

.bk-summary-card .summary-title i {
    margin-right: 6px;
}

.bk-summary-card .summary-text {
    font-size: 14px;
    color: var(--bk-text-secondary);
    line-height: 1.8;
}

/* 正文排版 */
.bk-content {
    font-size: 15px;
    line-height: 1.8;
    color: var(--bk-text);
}

.bk-content p {
    margin-bottom: 16px;
    text-indent: 0;
}

.bk-content h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--bk-text);
    margin: 32px 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--bk-border);
}

.bk-content h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--bk-text);
    margin: 24px 0 12px;
}

.bk-content h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--bk-text);
    margin: 20px 0 10px;
}

.bk-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--bk-radius);
    margin: 16px 0;
}

.bk-content a {
    color: var(--bk-blue);
}

.bk-content blockquote {
    border-left: 4px solid var(--bk-blue);
    padding: 12px 16px;
    margin: 16px 0;
    background: var(--bk-blue-bg);
    border-radius: 0 var(--bk-radius) var(--bk-radius) 0;
    font-size: 14px;
    color: var(--bk-text-secondary);
}

.bk-content pre {
    background: #282c34;
    color: #abb2bf;
    padding: 16px;
    border-radius: var(--bk-radius);
    overflow-x: auto;
    margin: 16px 0;
    font-size: 13px;
    line-height: 1.6;
}

.bk-content code {
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 13px;
    color: #e83e8c;
}

.bk-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.bk-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.bk-content table th,
.bk-content table td {
    border: 1px solid var(--bk-border);
    padding: 10px 12px;
    text-align: left;
}

.bk-content table th {
    background: #fafafa;
    font-weight: 600;
}

.bk-content ul,
.bk-content ol {
    padding-left: 24px;
    margin-bottom: 16px;
}

.bk-content li {
    margin-bottom: 6px;
}

/* 操作栏 */
.bk-action-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    margin-top: 24px;
    border-top: 1px solid var(--bk-border);
    flex-wrap: wrap;
    gap: 12px;
}

.bk-action-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.bk-action-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 评分 */
.bk-score {
    display: flex;
    align-items: center;
    gap: 4px;
}

.bk-score .score-star {
    font-size: 18px;
    color: #ddd;
    cursor: pointer;
    transition: color 0.15s, transform 0.15s;
}

.bk-score .score-star:hover {
    transform: scale(1.15);
}

.bk-score .score-star.active {
    color: #ffc107;
}

.bk-score-text {
    font-size: 13px;
    color: var(--bk-text-muted);
    margin-left: 8px;
}

/* 收藏/分享按钮 */
.bk-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 16px;
    border-radius: var(--bk-radius);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--bk-border);
    background: #fff;
    color: var(--bk-text-secondary);
    text-decoration: none;
}

.bk-btn:hover {
    border-color: var(--bk-blue);
    color: var(--bk-blue);
    text-decoration: none;
}

.bk-btn.active {
    background: var(--bk-blue);
    color: #fff;
    border-color: var(--bk-blue);
}

.bk-btn i {
    font-size: 13px;
}

/* ========== 侧边栏 ========== */
.bk-sidebar-widget {
    background: var(--bk-white);
    border-radius: var(--bk-radius);
    box-shadow: var(--bk-shadow);
    margin-bottom: 16px;
    overflow: hidden;
}

.bk-widget-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--bk-border);
}

.bk-widget-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--bk-text);
    display: flex;
    align-items: center;
}

.bk-widget-title i {
    margin-right: 8px;
    color: var(--bk-blue);
    font-size: 14px;
}

.bk-widget-body {
    padding: 12px 16px;
}

.bk-widget-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.bk-widget-list li {
    border-bottom: 1px solid #f5f5f5;
}

.bk-widget-list li:last-child {
    border-bottom: none;
}

.bk-widget-list li a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    font-size: 14px;
    color: var(--bk-text);
    text-decoration: none;
    transition: color 0.15s;
}

.bk-widget-list li a:hover {
    color: var(--bk-blue);
    text-decoration: none;
}

.bk-widget-list li a .count {
    font-size: 12px;
    color: var(--bk-text-muted);
    flex-shrink: 0;
}

/* 热门序号 */
.bk-rank-item {
    display: flex;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid #f5f5f5;
}

.bk-rank-item:last-child {
    border-bottom: none;
}

.bk-rank-num {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    color: var(--bk-text-muted);
    background: #f0f0f0;
    margin-right: 10px;
    flex-shrink: 0;
}

.bk-rank-item:nth-child(1) .bk-rank-num {
    background: #ff4d4f;
    color: #fff;
}

.bk-rank-item:nth-child(2) .bk-rank-num {
    background: #ff7a45;
    color: #fff;
}

.bk-rank-item:nth-child(3) .bk-rank-num {
    background: #ffa940;
    color: #fff;
}

.bk-rank-text {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
}

.bk-rank-text a {
    color: var(--bk-text);
}

.bk-rank-text a:hover {
    color: var(--bk-blue);
    text-decoration: none;
}

.bk-rank-views {
    font-size: 12px;
    color: var(--bk-text-muted);
    flex-shrink: 0;
    margin-left: 8px;
}

/* 分类标签云 */
.bk-category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.bk-category-tag {
    display: inline-block;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--bk-text-secondary);
    background: #f5f5f5;
    border: 1px solid var(--bk-border);
    text-decoration: none;
    transition: all 0.2s;
}

.bk-category-tag:hover {
    background: var(--bk-blue-light);
    color: var(--bk-blue);
    border-color: #b3d1ff;
    text-decoration: none;
}

/* ========== 相关文章 ========== */
.bk-related-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.bk-related-list li {
    padding: 8px 0;
    border-bottom: 1px dashed #f0f0f0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.bk-related-list li:last-child {
    border-bottom: none;
}

.bk-related-list li::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--bk-blue);
    flex-shrink: 0;
}

.bk-related-list li a {
    font-size: 14px;
    color: var(--bk-text);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bk-related-list li a:hover {
    color: var(--bk-blue);
}

.bk-related-list li .time {
    font-size: 12px;
    color: var(--bk-text-muted);
    flex-shrink: 0;
}

/* ========== 评论区 ========== */
.bk-comment-item {
    display: flex;
    padding: 16px 0;
    border-bottom: 1px solid #f5f5f5;
    gap: 12px;
}

.bk-comment-item:last-child {
    border-bottom: none;
}

.bk-comment-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.bk-comment-body {
    flex: 1;
    min-width: 0;
}

.bk-comment-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.bk-comment-author {
    font-size: 14px;
    font-weight: 600;
    color: var(--bk-text);
}

.bk-comment-time {
    font-size: 12px;
    color: var(--bk-text-muted);
}

.bk-comment-text {
    font-size: 14px;
    color: var(--bk-text-secondary);
    line-height: 1.6;
}

/* ========== 分页 ========== */
.bk-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 20px 0;
}

.bk-pagination a,
.bk-pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border-radius: var(--bk-radius);
    font-size: 14px;
    color: var(--bk-text);
    background: #fff;
    border: 1px solid var(--bk-border);
    text-decoration: none;
    transition: all 0.2s;
}

.bk-pagination a:hover {
    color: var(--bk-blue);
    border-color: var(--bk-blue);
    text-decoration: none;
}

.bk-pagination .active {
    background: var(--bk-blue);
    color: #fff;
    border-color: var(--bk-blue);
}

/* ========== 幻灯片 ========== */
.bk-carousel {
    border-radius: var(--bk-radius);
    overflow: hidden;
    margin-bottom: 16px;
    box-shadow: var(--bk-shadow);
}

.bk-carousel .carousel-item {
    height: 360px;
}

.bk-carousel .carousel-item img,
.bk-carousel .carousel-item-content {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.bk-carousel .carousel-item-content {
    display: flex;
    align-items: center;
    justify-content: center;
    background-size: cover;
    background-position: center;
    position: relative;
}

.bk-carousel .carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.65));
    padding: 40px 30px 30px;
    text-align: left;
}

.bk-carousel .carousel-caption h2 {
    font-size: 24px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}

.bk-carousel .carousel-caption p {
    font-size: 14px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 12px;
}

.bk-carousel .carousel-caption .btn {
    padding: 6px 20px;
    font-size: 14px;
    border-radius: 20px;
}

/* 幻灯片控制按钮 */
.bk-carousel .carousel-control-prev,
.bk-carousel .carousel-control-next {
    width: 40px;
    height: 40px;
    background: rgba(0,0,0,0.3);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity 0.3s;
}

.bk-carousel:hover .carousel-control-prev,
.bk-carousel:hover .carousel-control-next {
    opacity: 1;
}

.bk-carousel .carousel-control-prev {
    left: 16px;
}

.bk-carousel .carousel-control-next {
    right: 16px;
}

.bk-carousel .carousel-indicators {
    margin-bottom: 12px;
}

.bk-carousel .carousel-indicators button {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin: 0 4px;
}

/* ========== 页脚 ========== */
.bk-footer {
    background: #2b2b2b;
    color: #999;
    padding: 40px 0 24px;
    margin-top: 0;
}

.bk-footer h5 {
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
}

.bk-footer a {
    color: #999;
    font-size: 13px;
}

.bk-footer a:hover {
    color: #fff;
}

.bk-footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.bk-footer-links li {
    margin-bottom: 8px;
}

.bk-footer-links li a {
    display: flex;
    align-items: center;
    gap: 8px;
}

.bk-footer-links li a i {
    width: 14px;
    text-align: center;
    color: #666;
}

.bk-footer-bottom {
    border-top: 1px solid #3a3a3a;
    padding-top: 20px;
    margin-top: 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.bk-footer-bottom p {
    margin: 0;
    font-size: 13px;
    color: #666;
}

.bk-footer-bottom a {
    color: #666;
}

.bk-footer-bottom a:hover {
    color: #fff;
}

/* ========== 返回顶部 ========== */
.bk-back-top {
    position: fixed;
    bottom: 40px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bk-white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bk-blue);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
    border: none;
    text-decoration: none;
}

.bk-back-top.show {
    opacity: 1;
    visibility: visible;
}

.bk-back-top:hover {
    background: var(--bk-blue);
    color: #fff;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(51,136,255,0.3);
}

/* ========== 阅读进度条 ========== */
.bk-reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--bk-blue);
    z-index: 9999;
    transition: width 0.3s;
}

/* ========== 404 / 维护页 ========== */
.bk-error-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bk-bg);
    padding: 20px;
}

.bk-error-box {
    text-align: center;
    max-width: 480px;
}

.bk-error-code {
    font-size: 120px;
    font-weight: 700;
    color: var(--bk-blue);
    line-height: 1;
    opacity: 0.8;
}

.bk-error-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--bk-text);
    margin: 16px 0 12px;
}

.bk-error-desc {
    font-size: 14px;
    color: var(--bk-text-muted);
    margin-bottom: 30px;
}

.bk-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 28px;
    background: var(--bk-blue);
    color: #fff;
    border: none;
    border-radius: 22px;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.bk-btn-primary:hover {
    background: var(--bk-blue-dark);
    color: #fff;
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(51,136,255,0.3);
}

/* ========== 分类信息栏 ========== */
.bk-category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: var(--bk-white);
    border-radius: var(--bk-radius);
    box-shadow: var(--bk-shadow);
    flex-wrap: wrap;
    gap: 12px;
}

.bk-category-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--bk-text);
    margin-bottom: 4px;
}

.bk-category-desc {
    font-size: 13px;
    color: var(--bk-text-muted);
    margin: 0;
}

.bk-category-stats {
    display: flex;
    align-items: center;
    gap: 16px;
}

.bk-stat-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 14px;
    border-radius: 14px;
    font-size: 13px;
    background: var(--bk-blue-light);
    color: var(--bk-blue);
    white-space: nowrap;
}

.bk-stat-item i {
    font-size: 12px;
}

/* ========== 下载列表页 ========== */
.bk-side-nav-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    font-size: 14px;
    color: var(--bk-text);
    text-decoration: none;
    border-bottom: 1px solid #f5f5f5;
    transition: all 0.15s;
}

.bk-side-nav-item:last-child {
    border-bottom: none;
}

.bk-side-nav-item:hover {
    background: var(--bk-blue-bg);
    color: var(--bk-blue);
    text-decoration: none;
}

.bk-side-nav-item.active {
    background: var(--bk-blue-bg);
    color: var(--bk-blue);
    font-weight: 600;
}

.bk-side-nav-count {
    font-size: 12px;
    color: var(--bk-text-muted);
    background: #f0f0f0;
    padding: 2px 8px;
    border-radius: 10px;
}

/* 下载列表搜索框（非头部） */
.bk-section .bk-search-box {
    display: flex;
    align-items: center;
    background: #f5f5f5;
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    padding: 0;
    overflow: hidden;
}

.bk-section .bk-search-box i {
    padding: 0 12px;
    color: var(--bk-text-muted);
    font-size: 14px;
}

.bk-section .bk-search-box input {
    flex: 1;
    height: 36px;
    padding: 0 12px 0 0;
    border: none;
    background: transparent;
    font-size: 14px;
    color: var(--bk-text);
    outline: none;
}

.bk-section .bk-search-box input::placeholder {
    color: var(--bk-text-muted);
}

.bk-search-btn {
    height: 36px;
    padding: 0 18px;
    background: var(--bk-blue);
    color: #fff;
    border: none;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.bk-search-btn:hover {
    background: var(--bk-blue-dark);
}

/* 下载卡片 */
.bk-dl-card {
    background: var(--bk-white);
    border-radius: var(--bk-radius);
    box-shadow: var(--bk-shadow);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.bk-dl-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.bk-dl-card-body {
    padding: 16px 20px;
}

.bk-dl-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--bk-radius);
    overflow: hidden;
    flex-shrink: 0;
    margin-right: 14px;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bk-dl-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.bk-dl-icon i {
    font-size: 28px;
    color: var(--bk-text-muted);
}

.bk-dl-info {
    flex: 1;
    min-width: 0;
}

.bk-dl-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--bk-text);
    margin-bottom: 6px;
}

.bk-dl-title a {
    color: var(--bk-text);
    text-decoration: none;
}

.bk-dl-title a:hover {
    color: var(--bk-blue);
}

.bk-dl-meta {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--bk-text-muted);
    margin-bottom: 8px;
}

.bk-dl-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.bk-dl-meta i {
    font-size: 11px;
}

.bk-dl-desc {
    font-size: 13px;
    color: var(--bk-text-muted);
    line-height: 1.6;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.bk-dl-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-top: 1px solid #f5f5f5;
}

.bk-dl-stats {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 12px;
    color: var(--bk-text-muted);
}

.bk-dl-stats span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.bk-dl-stats i {
    font-size: 11px;
}

.bk-btn-sm {
    padding: 5px 14px !important;
    font-size: 13px !important;
}

/* 下载详情 - 信息列表 */
.bk-dl-info-list {
    border-bottom: 1px solid var(--bk-border);
}

.bk-dl-info-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid #f5f5f5;
    font-size: 14px;
}

.bk-dl-info-item:last-child {
    border-bottom: none;
}

.bk-dl-info-item span {
    color: var(--bk-text-secondary);
}

/* 相关下载推荐项 */
.bk-related-dl-item {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    border-bottom: 1px solid #f5f5f5;
    text-decoration: none;
    transition: background 0.15s;
}

.bk-related-dl-item:last-child {
    border-bottom: none;
}

.bk-related-dl-item:hover {
    background: var(--bk-blue-bg);
    text-decoration: none;
}

.bk-related-dl-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--bk-radius);
    overflow: hidden;
    flex-shrink: 0;
    margin-right: 10px;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bk-related-dl-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.bk-related-dl-icon i {
    font-size: 16px;
    color: var(--bk-text-muted);
}

.bk-related-dl-info {
    flex: 1;
    min-width: 0;
}

.bk-related-dl-title {
    font-size: 14px;
    color: var(--bk-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 分页 link 修复 */
.bk-pagination .bk-page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border-radius: var(--bk-radius);
    font-size: 14px;
    color: var(--bk-text);
    background: #fff;
    border: 1px solid var(--bk-border);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.bk-pagination .bk-page-link:hover {
    color: var(--bk-blue);
    border-color: var(--bk-blue);
    text-decoration: none;
}

.bk-pagination .bk-page-link.active {
    background: var(--bk-blue);
    color: #fff;
    border-color: var(--bk-blue);
}

/* 点赞按钮变体 */
.bk-btn-danger {
    background: #ff4d4f !important;
    color: #fff !important;
    border-color: #ff4d4f !important;
}

/* ========== 下载页 ========== */
.bk-download-card {
    background: var(--bk-white);
    border-radius: var(--bk-radius);
    box-shadow: var(--bk-shadow);
    overflow: hidden;
}

.bk-download-header {
    display: flex;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--bk-border);
    gap: 16px;
}

.bk-download-icon {
    width: 72px;
    height: 72px;
    border-radius: 12px;
    overflow: hidden;
    flex-shrink: 0;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bk-download-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.bk-download-stats {
    display: flex;
    align-items: center;
    text-align: center;
    padding: 16px 0;
    border-top: 1px solid var(--bk-border);
    border-bottom: 1px solid var(--bk-border);
}

.bk-download-stats .stat-item {
    flex: 1;
}

.bk-download-stats .stat-item + .stat-item {
    border-left: 1px solid var(--bk-border);
}

.bk-download-stats .stat-num {
    font-size: 20px;
    font-weight: 700;
    color: var(--bk-text);
}

.bk-download-stats .stat-label {
    font-size: 12px;
    color: var(--bk-text-muted);
    margin-top: 4px;
}

.bk-download-panel {
    background: var(--bk-white);
    border-radius: var(--bk-radius);
    box-shadow: var(--bk-shadow);
    overflow: hidden;
}

.bk-download-panel-header {
    background: var(--bk-blue);
    color: #fff;
    padding: 12px 16px;
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.bk-info-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid #f5f5f5;
    font-size: 14px;
}

.bk-info-row:last-child {
    border-bottom: none;
}

.bk-btn-download {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px;
    background: var(--bk-blue);
    color: #fff;
    border: none;
    border-radius: var(--bk-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.bk-btn-download:hover {
    background: var(--bk-blue-dark);
    box-shadow: 0 4px 12px rgba(51,136,255,0.3);
}

/* ========== 空状态 ========== */
.bk-empty {
    text-align: center;
    padding: 60px 20px;
}

.bk-empty i {
    font-size: 56px;
    color: #ddd;
    margin-bottom: 16px;
}

.bk-empty p {
    font-size: 14px;
    color: var(--bk-text-muted);
}

/* ========== 响应式 ========== */
@media (max-width: 992px) {
    .bk-nav {
        display: none;
    }

    .bk-search-box input {
        width: 180px;
    }

    .bk-search-box input:focus {
        width: 200px;
    }

    .bk-article-thumb {
        width: 120px;
        height: 80px;
    }

    .bk-carousel .carousel-item {
        height: 260px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 50px;
    }

    .bk-logo {
        font-size: 16px;
        margin-right: 16px;
    }

    .bk-logo span {
        display: none;
    }

    .bk-search-box input {
        width: 140px;
    }

    .bk-user-btn span {
        display: none;
    }

    .bk-detail-title {
        font-size: 22px;
    }

    .bk-detail {
        padding: 16px;
    }

    .bk-section-body {
        padding: 12px 16px;
    }

    .bk-article-item {
        flex-direction: column;
    }

    .bk-article-thumb {
        width: 100%;
        height: 180px;
    }

    .bk-carousel .carousel-item {
        height: 200px;
    }

    .bk-footer {
        padding: 24px 0 16px;
    }

    .bk-back-top {
        bottom: 20px;
        right: 16px;
        width: 38px;
        height: 38px;
        font-size: 16px;
    }
}

/* ========== 滚动条 ========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f5f5f5;
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #aaa;
}

/* ========== 文本选择 ========== */
::selection {
    background: var(--bk-blue);
    color: #fff;
}

::-moz-selection {
    background: var(--bk-blue);
    color: #fff;
}

/* ========== 动画 ========== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.bk-section,
.bk-sidebar-widget {
    animation: fadeInUp 0.4s ease;
}

/* ========== 表单 ========== */
.bk-form-control {
    width: 100%;
    height: 38px;
    padding: 0 12px;
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    font-size: 14px;
    color: var(--bk-text);
    outline: none;
    transition: border-color 0.2s;
}

.bk-form-control:focus {
    border-color: var(--bk-blue);
    box-shadow: 0 0 0 2px rgba(51,136,255,0.1);
}

textarea.bk-form-control {
    height: auto;
    padding: 10px 12px;
    resize: vertical;
}

.bk-btn-submit {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 24px;
    background: var(--bk-blue);
    color: #fff;
    border: none;
    border-radius: var(--bk-radius);
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
}

.bk-btn-submit:hover {
    background: var(--bk-blue-dark);
}

/* ========== 收藏下拉 ========== */
.bk-dropdown-menu {
    display: none;
    position: absolute;
    background: #fff;
    border-radius: var(--bk-radius);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    padding: 6px 0;
    z-index: 1100;
    min-width: 160px;
}

.bk-dropdown-menu.show {
    display: block;
}

.bk-dropdown-item {
    display: block;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--bk-text);
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s;
}

.bk-dropdown-item:hover {
    background: var(--bk-blue-light);
    color: var(--bk-blue);
    text-decoration: none;
}

/* ========== 导航移动端 ========== */
.bk-mobile-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    background: none;
    border: none;
}

@media (max-width: 992px) {
    .bk-mobile-toggle {
        display: flex;
    }
}

.bk-mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: #fff;
    z-index: 1040;
    overflow-y: auto;
    padding: 16px;
}

.bk-mobile-menu.show {
    display: block;
}

.bk-mobile-menu a {
    display: block;
    padding: 12px 16px;
    color: var(--bk-text);
    font-size: 15px;
    border-bottom: 1px solid #f5f5f5;
    text-decoration: none;
}

.bk-mobile-menu a:hover {
    color: var(--bk-blue);
    background: var(--bk-blue-bg);
}