/* ==========================================================================
   51吃瓜网入口 · 整站样式表
   版本：1.0
   说明：本样式表覆盖全站所有页面真实 DOM，按 base / layout / components /
         pages / responsive 分组组织。
   ========================================================================== */

/* ==========================================================================
   base — 基础变量、重置、全局元素与统一视觉骨架
   ========================================================================== */

:root {
  --color-primary: #1a73e8;
  --color-accent: #ff6d00;
  --color-text: #212121;
  --color-text-light: #616161;
  --color-text-lighter: #9e9e9e;
  --color-bg: #ffffff;
  --color-bg-light: #f5f5f5;
  --color-bg-gray: #fafafa;
  --color-border: #e0e0e0;
  --color-border-light: #eeeeee;
  --color-white: #ffffff;
  --color-link-hover: #1557b0;

  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;

  --font-size-h1: 32px;
  --font-size-h2: 24px;
  --font-size-h3: 18px;
  --font-size-body: 16px;
  --font-size-small: 14px;
  --font-size-xs: 13px;

  --line-height-body: 1.6;
  --line-height-heading: 1.4;

  --container-width: 1200px;
  --container-padding: 20px;

  --border-radius-card: 8px;
  --border-radius-tag: 4px;
  --border-radius-btn: 6px;

  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.1);

  --transition-base: 0.2s ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: var(--line-height-heading);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

p {
  margin-bottom: 12px;
}

/* 统一容器宽度 */
.site-header .header-inner,
.site-main,
.inner-main,
.main-content,
.site-footer .footer-inner {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ==========================================================================
   layout — 全站布局骨架：页头、主区、页脚、侧栏网格
   ========================================================================== */

/* --- 页头 --- */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.logo-area {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.5px;
}

.brand-slogan {
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
  margin-top: 2px;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list li a {
  display: inline-block;
  padding: 8px 14px;
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--border-radius-tag);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-list li a:hover {
  background-color: var(--color-bg-light);
  color: var(--color-primary);
}

.nav-list li a.is-current {
  color: var(--color-primary);
  background-color: rgba(26, 115, 232, 0.08);
  font-weight: 600;
}

/* 汉堡按钮（移动端显示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-tag);
  background-color: var(--color-white);
  cursor: pointer;
  gap: 5px;
  padding: 10px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* --- 主区 --- */
.site-main {
  flex: 1;
  padding-top: 32px;
  padding-bottom: 48px;
}

.home-main {
  padding-top: 0;
}

/* 内页统一布局外壳 */
.layout-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 280px;
  gap: 24px;
  align-items: start;
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* 侧栏在左的布局：DOM 顺序为 aside、main、aside */
.layout-shell.sidebar-left {
  grid-template-columns: 240px minmax(0, 1fr) 280px;
}

.layout-shell.sidebar-left > aside,
.layout-shell.sidebar-left > .sidebar {
  grid-column: 1;
}

.layout-shell.sidebar-left > main,
.layout-shell.sidebar-left > .main-content {
  grid-column: 2;
}

.layout-shell.sidebar-left > aside.sidebar-right-aside,
.layout-shell.sidebar-left > aside.sidebar-right-panel,
.layout-shell.sidebar-left > .sidebar-right-panel {
  grid-column: 3;
}

/* 两栏布局：FAQ 页 */
.layout-shell.sidebar-left.two-column {
  grid-template-columns: 240px minmax(0, 1fr);
}

.layout-shell.sidebar-left.two-column > aside {
  grid-column: 1;
}

.layout-shell.sidebar-left.two-column > .main-content {
  grid-column: 2;
}

/* 内页主体（非 grid 直接子元素时） */
.inner-main {
  padding-top: 0;
  padding-bottom: 0;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  font-size: var(--font-size-small);
  color: var(--color-text-lighter);
  margin-bottom: 16px;
  gap: 6px;
  line-height: 1.4;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
}

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

/* 页面标题区 */
.page-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border-light);
}

.page-title {
  font-size: var(--font-size-h1);
  margin-bottom: 8px;
}

.page-description {
  font-size: var(--font-size-body);
  color: var(--color-text-light);
  max-width: 720px;
  line-height: var(--line-height-body);
}

/* --- 页脚 --- */
.site-footer {
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border-light);
  margin-top: auto;
  padding-top: 40px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
}

.footer-col {
  min-width: 0;
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
}

.footer-title {
  font-size: var(--font-size-body);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.footer-links li a {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  transition: color var(--transition-base);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border-light);
  padding: 16px 0;
  text-align: center;
}

.footer-bottom p {
  margin-bottom: 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
}

/* ==========================================================================
   components — 通用组件：侧栏、卡片、列表、按钮、标签、FAQ 等
   ========================================================================== */

/* --- 侧栏通用 --- */
.sidebar,
.side-nav,
.side-picks,
.sidebar-left-aside,
.sidebar-right-aside,
.sidebar-left-panel,
.sidebar-right-panel {
  min-width: 0;
}

.sidebar-card,
.aside-block,
.side-module {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-card);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-title,
.aside-title,
.side-title {
  font-size: var(--font-size-body);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-primary);
}

.sidebar-links li,
.aside-nav-list li,
.side-links li {
  margin-bottom: 6px;
}

.sidebar-links li a,
.aside-nav-list li a,
.side-links li a {
  display: block;
  padding: 8px 10px;
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  border-radius: var(--border-radius-tag);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.sidebar-links li a:hover,
.aside-nav-list li a:hover,
.side-links li a:hover {
  background-color: var(--color-bg-light);
  color: var(--color-primary);
}

/* 侧栏最新资讯列表 */
.aside-news-list li {
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.aside-news-list li:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.aside-news-list li a {
  font-size: var(--font-size-small);
  color: var(--color-text);
  line-height: 1.5;
  display: block;
}

.aside-news-list li a:hover {
  color: var(--color-primary);
}

/* 侧栏说明文字 */
.side-note,
.sidebar-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
  line-height: 1.5;
  margin-top: 12px;
  margin-bottom: 0;
}

/* 侧栏编辑推荐 */
.pick-list li {
  margin-bottom: 12px;
}

.pick-list li:last-child {
  margin-bottom: 0;
}

.pick-list .pick-item a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  border-radius: var(--border-radius-tag);
  background-color: var(--color-bg-gray);
  transition: background-color var(--transition-base);
}

.pick-list .pick-item a:hover {
  background-color: var(--color-bg-light);
}

.pick-cat {
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  font-weight: 600;
}

.pick-text {
  font-size: var(--font-size-small);
  color: var(--color-text);
  line-height: 1.5;
}

/* --- 区块标题通用 --- */
.section-title {
  font-size: var(--font-size-h2);
  margin-bottom: 8px;
  position: relative;
  padding-left: 12px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-primary);
}

.section-intro,
.section-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  margin-bottom: 20px;
  max-width: 720px;
  line-height: 1.6;
}

/* --- 卡片通用 --- */
.topic-card,
.channel-card,
.focal-report-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-card);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.topic-card:hover,
.channel-card:hover,
.focal-report-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border);
}

/* --- 图片容器统一 --- */
.hero-figure,
.focal-report-media,
.news-media,
.topic-media,
.channel-media,
.article-media,
.guide-figure,
.content-media {
  overflow: hidden;
  background-color: var(--color-bg-light);
}

.hero-figure img,
.focal-report-media img,
.news-media img,
.topic-media img,
.channel-media img,
.article-media img,
.guide-figure img,
.content-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- 链接箭头 --- */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 500;
}

.link-arrow::after {
  content: "→";
  transition: transform var(--transition-base);
}

.link-arrow:hover::after {
  transform: translateX(3px);
}

/* ==========================================================================
   pages / index — 首页专属模块
   ========================================================================== */

/* --- 首屏 Hero --- */
.hero-section {
  background-color: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border-light);
  padding: 48px 0 40px;
  margin-bottom: 48px;
}

.hero-section .hero-content,
.hero-section .hero-figure {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.hero-section .hero-content {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero-title {
  font-size: 34px;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-desc {
  font-size: var(--font-size-body);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: var(--font-size-small);
  font-weight: 600;
  border-radius: var(--border-radius-btn);
  background-color: var(--color-primary);
  color: var(--color-white);
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.hero-btn:hover {
  background-color: var(--color-link-hover);
  color: var(--color-white);
}

.hero-btn:nth-child(2) {
  background-color: var(--color-accent);
}

.hero-btn:nth-child(2):hover {
  background-color: #e65100;
}

.hero-btn:nth-child(3) {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.hero-btn:nth-child(3):hover {
  background-color: var(--color-bg-light);
}

.hero-figure {
  border-radius: var(--border-radius-card);
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  height: 320px;
}

.hero-figure figcaption {
  padding: 10px 14px;
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border-light);
}

/* --- 焦点报道 --- */
.focal-report-section {
  margin-bottom: 48px;
}

.focal-report-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.focal-report-card {
  display: flex;
  flex-direction: column;
}

.focal-report-media {
  aspect-ratio: 16 / 9;
}

.focal-report-media img {
  height: 100%;
}

.focal-report-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.focal-report-title {
  font-size: var(--font-size-h3);
  margin-bottom: 8px;
  line-height: 1.4;
}

.focal-report-summary {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.focal-report-link {
  font-size: var(--font-size-small);
  font-weight: 600;
}

/* --- 频道标签 --- */
.channels-nav-section {
  margin-bottom: 48px;
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.channel-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-tag);
  transition: background-color var(--transition-base), color var(--transition-base),
    border-color var(--transition-base);
}

.channel-tag:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* --- 最新资讯列表 --- */
.latest-news-section {
  margin-bottom: 48px;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.news-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-card);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.news-item:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border);
}

.news-media {
  flex-shrink: 0;
  width: 180px;
  aspect-ratio: 16 / 10;
  border-radius: var(--border-radius-tag);
}

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

.news-title {
  font-size: var(--font-size-body);
  line-height: 1.4;
  margin-bottom: 6px;
}

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

.news-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
}

/* --- 专题推荐 --- */
.topics-section {
  margin-bottom: 48px;
}

.topic-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.topic-card {
  display: flex;
  flex-direction: column;
}

.topic-card img {
  aspect-ratio: 16 / 9;
  width: 100%;
}

.topic-card .topic-title {
  font-size: var(--font-size-h3);
  margin: 16px 20px 8px;
  line-height: 1.4;
}

.topic-card .topic-summary {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0 20px 16px;
  flex: 1;
}

.topic-card .topic-link {
  font-size: var(--font-size-small);
  font-weight: 600;
  margin: 0 20px 20px;
}

/* --- 编辑推荐 --- */
.editor-picks-section {
  margin-bottom: 48px;
}

.picks-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pick-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  background-color: var(--color-bg-gray);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--border-radius-tag) var(--border-radius-tag) 0;
}

.pick-item .pick-title {
  font-size: var(--font-size-body);
  margin-bottom: 4px;
}

.pick-item .pick-reason {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 4px;
}

.pick-item .pick-link {
  font-size: var(--font-size-xs);
  font-weight: 600;
}

/* --- 信息来源与反馈 --- */
.source-info-section {
  margin-bottom: 24px;
  padding: 24px;
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius-card);
}

.source-info-content p {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.source-info-content a {
  font-weight: 500;
}

/* ==========================================================================
   pages / channels — 频道分类页
   ========================================================================== */

.channel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 32px;
}

.channel-card {
  display: flex;
  flex-direction: column;
}

.channel-media {
  aspect-ratio: 16 / 9;
}

.channel-content {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.channel-name {
  font-size: var(--font-size-h3);
  margin-bottom: 8px;
}

.channel-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.channel-link {
  font-size: var(--font-size-small);
  font-weight: 600;
}

/* 频道介绍 */
.intro-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.intro-item {
  padding: 16px 20px;
  background-color: var(--color-bg-gray);
  border-radius: var(--border-radius-tag);
}

.intro-name {
  font-size: var(--font-size-body);
  margin-bottom: 4px;
}

.intro-text {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 相关链接 */
.related-links {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
}

.related-links p {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  margin-bottom: 0;
}

.related-links a {
  font-weight: 500;
  margin-right: 16px;
}

/* ==========================================================================
   pages / topics — 内容专题页
   ========================================================================== */

.topic-intro {
  margin-bottom: 32px;
}

.topic-intro p {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.7;
}

.topic-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 32px;
}

.topic-list .topic-card {
  display: flex;
  gap: 20px;
  padding: 20px;
}

.topic-media {
  flex-shrink: 0;
  width: 220px;
  aspect-ratio: 16 / 10;
  border-radius: var(--border-radius-tag);
}

.topic-media img {
  height: 100%;
}

.topic-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topic-name {
  font-size: var(--font-size-h3);
  margin-bottom: 8px;
}

.topic-summary {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.topic-points {
  list-style: disc;
  padding-left: 18px;
  margin-bottom: 12px;
}

.topic-points li {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 4px;
}

.topic-more {
  margin-top: auto;
  margin-bottom: 0;
}

.topic-more a {
  font-size: var(--font-size-small);
  font-weight: 600;
}

.topic-note {
  padding: 20px;
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius-card);
  margin-bottom: 24px;
}

.topic-note p {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.topic-note a {
  font-weight: 500;
}

/* ==========================================================================
   pages / insight — 深度解读页
   ========================================================================== */

.article-list-section {
  margin-bottom: 40px;
}

.article-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.article-item:first-of-type {
  padding-top: 0;
}

.article-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.article-media {
  flex-shrink: 0;
  width: 200px;
  aspect-ratio: 16 / 10;
  border-radius: var(--border-radius-tag);
}

.article-media img {
  height: 100%;
}

.article-content {
  flex: 1;
  min-width: 0;
}

.article-title {
  font-size: var(--font-size-h3);
  line-height: 1.4;
  margin-bottom: 6px;
}

.article-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
  margin-bottom: 8px;
}

.article-excerpt {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-readmore {
  margin-bottom: 0;
}

.article-readmore a {
  font-size: var(--font-size-small);
  font-weight: 600;
}

/* 编辑推荐（内页版） */
.editor-picks-section .picks-list {
  gap: 16px;
}

.editor-picks-section .pick-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background-color: var(--color-bg-gray);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--border-radius-tag) var(--border-radius-tag) 0;
}

.pick-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 6px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: 700;
  border-radius: var(--border-radius-tag);
}

.editor-picks-section .pick-title {
  font-size: var(--font-size-small);
  margin-bottom: 4px;
}

.editor-picks-section .pick-title a {
  color: var(--color-text);
}

.editor-picks-section .pick-title a:hover {
  color: var(--color-primary);
}

.editor-picks-section .pick-reason {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 0;
}

/* ==========================================================================
   pages / guide — 实用指南页
   ========================================================================== */

.guide-steps {
  margin-bottom: 40px;
}

.guide-step-item {
  padding: 20px;
  margin-bottom: 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-card);
}

.guide-step-title {
  font-size: var(--font-size-h3);
  margin-bottom: 8px;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
}

.guide-step-text {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.guide-step-text a {
  font-weight: 500;
}

.guide-step-example {
  font-size: var(--font-size-small);
  color: var(--color-text-lighter);
  line-height: 1.6;
  padding: 12px 16px;
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius-tag);
  margin-bottom: 0;
}

/* 工具推荐 */
.tool-recommend {
  margin-bottom: 40px;
}

.guide-figure {
  border-radius: var(--border-radius-card);
  margin-bottom: 20px;
}

.guide-figure img {
  height: 200px;
}

.guide-figure figcaption {
  padding: 10px 14px;
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border-light);
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.tool-item {
  padding: 16px;
  background-color: var(--color-bg-gray);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-card);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.tool-item:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border);
}

.tool-name {
  font-size: var(--font-size-body);
  margin-bottom: 6px;
}

.tool-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 筛选技巧 */
.filter-tips {
  margin-bottom: 40px;
}

.tip-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.tip-list li {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
  padding-left: 20px;
  position: relative;
}

.tip-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.tip-list strong {
  color: var(--color-text);
  font-weight: 600;
}

.tip-summary {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
}

.tip-summary a {
  font-weight: 500;
}

/* 反馈说明 */
.feedback-note {
  padding: 20px;
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius-card);
}

.feedback-text {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.feedback-text a {
  font-weight: 500;
}

/* ==========================================================================
   pages / faq — 常见问题页
   ========================================================================== */

.faq-section {
  margin-bottom: 32px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-tag);
  background-color: var(--color-white);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: var(--font-size-body);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color var(--transition-base);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.faq-item[open] summary {
  background-color: var(--color-bg-light);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* FAQ 页侧栏图片 */
.content-media-inline {
  border-radius: var(--border-radius-card);
  margin-bottom: 16px;
}

.content-media-inline img {
  height: 140px;
}

.content-media-inline figcaption {
  padding: 8px 12px;
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-top: none;
  border-radius: 0 0 var(--border-radius-tag) var(--border-radius-tag);
}

/* FAQ 页反馈说明 */
.faq-section + .feedback-note {
  margin-top: 8px;
}

.feedback-note p {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.feedback-note p:last-child {
  margin-bottom: 0;
}

.feedback-note a {
  font-weight: 500;
}

/* ==========================================================================
   pages / 404 — 错误页
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}

.error-panel {
  text-align: center;
  padding: 48px 24px;
  max-width: 480px;
  width: 100%;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: var(--font-size-h2);
  margin-bottom: 12px;
}

.error-desc {
  font-size: var(--font-size-body);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 24px;
}

.error-back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  font-size: var(--font-size-small);
  font-weight: 600;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius-btn);
  transition: background-color var(--transition-base);
}

.error-back-btn:hover {
  background-color: var(--color-link-hover);
  color: var(--color-white);
}

/* ==========================================================================
   responsive — 响应式断点
   ========================================================================== */

/* --- 平板：≤1024px --- */
@media (max-width: 1024px) {
  .layout-shell,
  .layout-shell.sidebar-left {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .layout-shell.sidebar-left > aside.sidebar-right-aside,
  .layout-shell.sidebar-left > aside.sidebar-right-panel,
  .layout-shell.sidebar-left > .sidebar-right-panel,
  .layout-shell > aside.sidebar-right-aside,
  .layout-shell > aside.sidebar-right-panel {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .layout-shell.sidebar-left > aside.sidebar-right-aside .aside-block,
  .layout-shell.sidebar-left > aside.sidebar-right-panel .sidebar-card,
  .layout-shell > aside.sidebar-right-aside .aside-block,
  .layout-shell > aside.sidebar-right-panel .sidebar-card {
    margin-bottom: 0;
  }

  .hero-section .hero-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-figure img {
    height: 260px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- 手机：≤768px --- */
@media (max-width: 768px) {
  :root {
    --font-size-h1: 28px;
    --font-size-h2: 22px;
    --font-size-h3: 17px;
    --container-padding: 16px;
  }

  /* 页头 */
  .header-inner {
    min-height: 56px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    border-top: 1px solid var(--color-border-light);
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list li a {
    display: block;
    padding: 12px 8px;
    border-radius: 0;
    border-bottom: 1px solid var(--color-border-light);
  }

  .nav-list li:last-child a {
    border-bottom: none;
  }

  /* 布局外壳改为单列 */
  .layout-shell,
  .layout-shell.sidebar-left,
  .layout-shell.sidebar-left.two-column {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .layout-shell.sidebar-left > aside,
  .layout-shell.sidebar-left > .sidebar,
  .layout-shell.sidebar-left > main,
  .layout-shell.sidebar-left > .main-content,
  .layout-shell > aside,
  .layout-shell > main,
  .layout-shell > .main-content {
    grid-column: 1;
  }

  /* 侧栏在手机端移到主内容之后（DOM 顺序保证 main 在前时自然如此） */
  .layout-shell.sidebar-left > aside:not(.sidebar-right-aside):not(.sidebar-right-panel),
  .layout-shell > aside:not(.sidebar-right-aside):not(.sidebar-right-panel) {
    order: 2;
    margin-top: 24px;
  }

  .layout-shell.sidebar-left > aside.sidebar-right-aside,
  .layout-shell.sidebar-left > aside.sidebar-right-panel,
  .layout-shell.sidebar-left > .sidebar-right-panel,
  .layout-shell > aside.sidebar-right-aside,
  .layout-shell > aside.sidebar-right-panel {
    order: 3;
    display: block;
    margin-top: 24px;
  }

  .layout-shell.sidebar-left > aside.sidebar-right-aside .aside-block,
  .layout-shell.sidebar-left > aside.sidebar-right-panel .sidebar-card,
  .layout-shell > aside.sidebar-right-aside .aside-block,
  .layout-shell > aside.sidebar-right-panel .sidebar-card {
    margin-bottom: 16px;
  }

  /* 首页 */
  .hero-section {
    padding: 32px 0 28px;
    margin-bottom: 32px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-btn {
    width: 100%;
  }

  .hero-figure img {
    height: 200px;
  }

  .focal-report-grid,
  .topic-cards,
  .channel-grid {
    grid-template-columns: 1fr;
  }

  .news-item {
    flex-direction: column;
  }

  .news-media {
    width: 100%;
    aspect-ratio: 16 / 9;
  }

  .news-title {
    font-size: var(--font-size-body);
  }

  .news-summary {
    -webkit-line-clamp: 3;
  }

  /* 内页文章 */
  .article-item {
    flex-direction: column;
    gap: 12px;
  }

  .article-media {
    width: 100%;
    aspect-ratio: 16 / 9;
  }

  /* 专题卡片 */
  .topic-list .topic-card {
    flex-direction: column;
  }

  .topic-media {
    width: 100%;
    aspect-ratio: 16 / 9;
  }

  /* 指南 */
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .guide-figure img {
    height: 160px;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* --- 小屏手机：≤390px --- */
@media (max-width: 390px) {
  :root {
    --container-padding: 12px;
  }

  .brand-name {
    font-size: 20px;
  }

  .brand-slogan {
    font-size: 12px;
  }

  .hero-title {
    font-size: 24px;
  }

  .error-code {
    font-size: 56px;
  }

  .focal-report-body,
  .channel-content {
    padding: 16px;
  }

  .topic-card .topic-title,
  .topic-card .topic-summary,
  .topic-card .topic-link {
    margin-left: 16px;
    margin-right: 16px;
  }
}