/**
 * DocHub - 学术文献检索与下载主题样式
 * @package doc_hub
 * @version 1.0.0
 */

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;
    --text-main: #0f172a;
    --text-body: #334155;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-body);
    background-color: var(--bg-page);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

a:hover {
    color: var(--primary-hover);
}

ul, ol {
    list-style: none;
}

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

/* 内置原生 SVG 矢量图标样式 */
.doc-svg-icon {
    display: inline-block;
    width: 1.1em;
    height: 1.1em;
    vertical-align: -0.15em;
    stroke-width: 2;
    flex-shrink: 0;
}

/* 基础排版与容器 */
.doc-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 顶部导航栏 */
.doc-header {
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.nav-brand .brand-link {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-main);
}

.brand-icon {
    font-size: 28px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.brand-icon .doc-svg-icon {
    width: 28px;
    height: 28px;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-main);
}

.brand-subtitle {
    font-size: 12px;
    color: var(--text-muted);
}

.nav-menu .menu-list {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-menu .menu-item a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-body);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

.nav-menu .menu-item a:hover,
.nav-menu .menu-item.active a {
    color: var(--primary-color);
    background-color: var(--primary-light);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-nav-action {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-body);
    padding: 6px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    background-color: #ffffff;
}

.btn-nav-action:hover {
    color: var(--primary-color);
    border-color: var(--primary-border);
    background-color: var(--primary-light);
}

.nav-toggle-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-body);
    cursor: pointer;
}

/* 首页 Hero 检索区 */
.doc-hero-section {
    background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 50px 0 40px;
    text-align: center;
}

.hero-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.5px;
    margin-bottom: 10px;
}

.hero-subtitle {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.doc-search-box-wrap {
    max-width: 820px;
    margin: 0 auto 20px;
}

.doc-hero-search-form {
    display: flex;
    align-items: center;
    background: #ffffff;
    border: 2px solid var(--primary-border);
    border-radius: var(--radius-full);
    padding: 6px 8px 6px 16px;
    box-shadow: var(--shadow-md);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.doc-hero-search-form:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.search-category-select .search-select {
    border: none;
    background: transparent;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-body);
    padding-right: 12px;
    border-right: 1px solid var(--border-color);
    outline: none;
    cursor: pointer;
}

.search-input-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 0 12px;
}

.search-input-wrap .search-icon {
    font-size: 18px;
    color: var(--text-light);
    margin-right: 8px;
}

.search-input-wrap .search-input {
    width: 100%;
    border: none;
    outline: none;
    font-size: 15px;
    color: var(--text-main);
    background: transparent;
}

.search-submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    font-size: 15px;
    font-weight: 600;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background-color 0.2s;
}

.search-submit-btn:hover {
    background-color: var(--primary-hover);
}

.hero-hot-tags {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 25px;
    font-size: 13px;
}

.hero-hot-tags .hot-label {
    color: var(--text-muted);
    font-weight: 500;
}

.hot-tag-item {
    background: #ffffff;
    color: var(--text-body);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
}

.hot-tag-item:hover {
    color: var(--primary-color);
    border-color: var(--primary-border);
    background: var(--primary-light);
}

.hero-stats-bar {
    display: inline-flex;
    align-items: center;
    background: #ffffff;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    gap: 24px;
}

.stat-item {
    text-align: center;
}

.stat-num {
    font-size: 18px;
    font-weight: 800;
    color: var(--primary-color);
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
}

/* 全站公告栏 */
.doc-alert-notice {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: #fffbeb;
    border: 1px solid #fde68a;
    color: #92400e;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    margin: 20px 0 0;
    font-size: 14px;
}

.doc-alert-notice .alert-icon {
    font-size: 18px;
    color: #d97706;
}

/* 主体内容布局 */
.doc-main-wrapper {
    padding: 30px 0 60px;
}

.main-layout-container {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 30px;
}

.doc-content-area {
    min-width: 0;
}

/* 列表筛选栏 */
.doc-list-filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #ffffff;
    border: 1px solid var(--border-color);
    padding: 12px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.filter-status .filter-tag {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
}

.filter-meta {
    font-size: 13px;
    color: var(--text-muted);
}

.filter-meta strong {
    color: var(--primary-color);
}

/* 文献卡片列表 */
.doc-cards-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.doc-card-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.doc-card-item:hover {
    border-color: var(--primary-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.doc-card-header {
    margin-bottom: 10px;
}

.doc-badge-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

/* 格式徽章 */
.doc-format-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.badge-pdf { background-color: #fee2e2; color: #b91c1c; }
.badge-docx { background-color: #e0f2fe; color: #0369a1; }
.badge-caj { background-color: #dcfce7; color: #15803d; }
.badge-ppt { background-color: #ffedd5; color: #c2410c; }
.badge-zip { background-color: #fef3c7; color: #b45309; }
.badge-other { background-color: #f1f5f9; color: #475569; }

.badge-top {
    background-color: #fef2f2;
    color: #dc2626;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
}

.badge-sortop {
    background-color: #f0fdf4;
    color: #16a34a;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
}

.doc-sort-badge {
    background-color: var(--primary-light);
    color: var(--primary-color);
    font-size: 12px;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 4px;
}

.doc-card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
}

.doc-card-title a {
    color: var(--text-main);
}

.doc-card-title a:hover {
    color: var(--primary-color);
}

/* 元信息行 */
.doc-card-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.doc-card-meta .meta-field {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.doc-card-meta .author-field a {
    color: var(--text-body);
    font-weight: 500;
}

/* 摘要 */
.doc-card-abstract {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-body);
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 卡片底部操作 */
.doc-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 14px;
    border-top: 1px dashed var(--border-color);
    font-size: 13px;
}

.doc-stats {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-light);
}

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

.btn-read-doc {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    background-color: var(--primary-light);
    padding: 6px 14px;
    border-radius: var(--radius-full);
}

.btn-read-doc:hover {
    background-color: var(--primary-color);
    color: #ffffff;
}

/* 文献详情页 */
.doc-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

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

.doc-breadcrumb a:hover {
    color: var(--primary-color);
}

.doc-breadcrumb .sep {
    color: var(--text-light);
}

.doc-breadcrumb .current-crumb {
    color: var(--text-main);
    font-weight: 500;
}

.doc-detail-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
}

.doc-detail-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.4;
    margin: 10px 0 20px;
}

/* 元数据矩阵 */
.doc-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px 24px;
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 24px;
    font-size: 14px;
}

.meta-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.meta-name {
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

.meta-val {
    color: var(--text-main);
    font-weight: 500;
    word-break: break-all;
}

.highlight-val {
    color: var(--primary-color);
    font-weight: 600;
}

.doi-link {
    color: var(--primary-color);
    font-family: monospace;
}

/* 详情操作按钮 */
.doc-tool-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: #ffffff;
}

.btn-outline-primary {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-border);
}

.btn-outline-primary:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
}

/* 摘要区块 */
.doc-abstract-box {
    background-color: #f0f7ff;
    border-left: 4px solid var(--primary-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 16px 20px;
    margin-bottom: 28px;
}

.abstract-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.abstract-content {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-body);
}

/* 正文区域 */
.doc-body-content {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-body);
    margin-bottom: 30px;
}

.content-section-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 6px;
}

.doc-body-content p {
    margin-bottom: 1em;
}

/* 关键词标签区 */
.doc-tags-section {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    padding: 16px 0;
    border-top: 1px solid var(--border-color);
    margin-bottom: 24px;
    font-size: 13px;
}

.tags-label {
    color: var(--text-muted);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.doc-tag-link {
    background-color: #f1f5f9;
    color: var(--text-body);
    padding: 3px 10px;
    border-radius: var(--radius-full);
}

.doc-tag-link:hover {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

/* 核心下载面板 */
.doc-download-card {
    background: linear-gradient(135deg, #f0f7ff 0%, #e0eefe 100%);
    border: 2px solid var(--primary-border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 30px 0;
    box-shadow: var(--shadow-sm);
}

.download-card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.download-icon {
    width: 44px;
    height: 44px;
    background-color: var(--primary-color);
    color: #ffffff;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.download-icon .doc-svg-icon {
    width: 24px;
    height: 24px;
}

.download-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
}

.download-subtitle {
    font-size: 13px;
    color: var(--text-muted);
}

.download-action-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 16px;
}

.btn-download-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--primary-color);
    color: #ffffff;
    font-size: 15px;
    font-weight: 700;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.btn-download-primary:hover {
    background-color: var(--primary-hover);
    color: #ffffff;
}

.pwd-box {
    display: inline-flex;
    align-items: center;
    background: #ffffff;
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    gap: 8px;
    font-size: 13px;
}

.pwd-label {
    color: var(--text-muted);
}

.pwd-code {
    font-family: monospace;
    font-weight: 700;
    color: #b91c1c;
    background-color: #fee2e2;
    padding: 2px 6px;
    border-radius: 4px;
}

.btn-copy-pwd {
    border: none;
    background: transparent;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.download-empty-notice {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    background: #ffffff;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
}

.download-disclaimer {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* 邻近文献导航 */
.doc-neighbor-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    padding: 20px 0 0;
    border-top: 1px solid var(--border-color);
}

.neighbor-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.neighbor-next {
    text-align: right;
}

.neighbor-label {
    font-size: 12px;
    color: var(--text-light);
}

.neighbor-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-body);
}

.neighbor-title:hover {
    color: var(--primary-color);
}

.neighbor-empty {
    font-size: 13px;
    color: var(--text-light);
}

/* 侧边栏 */
.doc-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-widget {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.widget-header {
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.widget-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 6px;
}

.sort-list, .new-list, .archive-list, .link-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sort-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    color: var(--text-body);
    padding: 4px 0;
}

.sort-link:hover, .sort-item.active .sort-link {
    color: var(--primary-color);
    font-weight: 600;
}

.sort-count {
    font-size: 12px;
    color: var(--text-light);
}

.sort-children {
    padding-left: 16px;
    margin-top: 6px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sort-child-item a {
    font-size: 13px;
    color: var(--text-muted);
}

.sort-child-item a:hover {
    color: var(--primary-color);
}

/* 热门榜单 */
.hot-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hot-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.rank-num {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 800;
    border-radius: 4px;
    flex-shrink: 0;
}

.rank-top {
    background-color: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.rank-normal {
    background-color: #f1f5f9;
    color: var(--text-muted);
}

.hot-title {
    font-size: 13px;
    color: var(--text-body);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hot-title:hover {
    color: var(--primary-color);
}

/* 标签云 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-chip {
    background-color: #f1f5f9;
    color: var(--text-body);
    font-size: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

.tag-chip:hover {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.tag-num {
    font-size: 10px;
    color: var(--text-light);
    margin-left: 2px;
}

/* 站长智库信息 */
.blogger-card {
    text-align: center;
    padding: 10px 0;
}

.blogger-avatar {
    width: 68px;
    height: 68px;
    border-radius: 50%;
    margin-bottom: 12px;
    border: 2px solid var(--primary-border);
}

.blogger-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 6px;
}

.blogger-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 14px;
    line-height: 1.5;
}

.blogger-meta {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.meta-tag {
    font-size: 11px;
    background-color: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

/* 分页 */
.doc-pagination-wrap {
    margin-top: 30px;
    text-align: center;
}

.doc-pagination-wrap span,
.doc-pagination-wrap a {
    display: inline-block;
    padding: 8px 14px;
    margin: 0 4px;
    font-size: 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background-color: #ffffff;
    color: var(--text-body);
}

.doc-pagination-wrap a:hover {
    border-color: var(--primary-border);
    color: var(--primary-color);
    background-color: var(--primary-light);
}

.doc-pagination-wrap span {
    background-color: var(--primary-color);
    color: #ffffff;
    border-color: var(--primary-color);
    font-weight: 600;
}

/* 评论区 */
.doc-comments-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
}

.comments-section-title, .post-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.comments-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.comment-item {
    display: flex;
    gap: 14px;
}

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

.comment-body {
    flex: 1;
}

.comment-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

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

.comment-date {
    font-size: 12px;
    color: var(--text-light);
}

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

.comment-children {
    margin-top: 14px;
    padding-left: 20px;
    border-left: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.form-group {
    margin-bottom: 14px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-main);
    outline: none;
    font-family: inherit;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-meta-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 14px;
}

/* 空状态 */
.doc-empty-state {
    text-align: center;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 60px 20px;
}

.empty-icon {
    font-size: 48px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.empty-icon .doc-svg-icon {
    width: 48px;
    height: 48px;
}

.empty-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.empty-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* 底部 Footer */
.doc-footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 40px 0 20px;
    font-size: 14px;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr;
    gap: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 10px;
}

.footer-brand i {
    color: var(--primary-color);
}

.footer-desc, .statement-text {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-col-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 12px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links a {
    color: var(--text-body);
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    padding-top: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 13px;
    color: var(--text-light);
}

.footer-bottom a {
    color: var(--text-muted);
}

.footer-bottom a:hover {
    color: var(--primary-color);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    z-index: 999;
}

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

/* 响应式适配 */
@media (max-width: 992px) {
    .main-layout-container {
        grid-template-columns: 1fr;
    }
    .footer-top {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 24px;
    }
    .doc-hero-search-form {
        flex-direction: column;
        border-radius: var(--radius-md);
        padding: 10px;
        gap: 10px;
    }
    .search-category-select .search-select {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        padding: 6px 0;
    }
    .search-input-wrap {
        width: 100%;
        padding: 6px 0;
    }
    .search-submit-btn {
        width: 100%;
        justify-content: center;
        border-radius: var(--radius-sm);
    }
    .hero-stats-bar {
        gap: 12px;
        padding: 8px 16px;
    }
    .nav-menu {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
    }
    .nav-menu.show {
        display: block;
    }
    .nav-menu .menu-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .nav-toggle-btn {
        display: block;
    }
    .form-meta-row {
        grid-template-columns: 1fr;
    }
    .doc-neighbor-nav {
        grid-template-columns: 1fr;
    }
    .neighbor-next {
        text-align: left;
    }
}