/* ==========================================================================
   BASE
   ========================================================================== */
:root {
  --color-bg: #f5efe6;
  --color-bg-alt: #efe7da;
  --color-text: #3e3a36;
  --color-text-light: #6b655d;
  --color-accent: #c0392b;
  --color-accent-dark: #a93226;
  --color-heading: #2c3e50;
  --color-white: #ffffff;
  --color-border: #ddd5c8;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-sans);
  color: var(--color-heading);
  line-height: 1.3;
  font-weight: 600;
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.layout-shell {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.layout-main {
  flex: 1 1 auto;
  min-width: 0;
}

/* 侧栏在布局中位于 main 之后（默认顺序） */
.layout-shell > main {
  flex: 1 1 auto;
  min-width: 0;
}

.layout-shell > aside {
  flex: 0 0 280px;
  width: 280px;
}

/* 侧栏在布局中位于 main 之前（sidebar-left） */
.layout-shell.sidebar-left > aside {
  order: -1;
  flex: 0 0 280px;
  width: 280px;
}

.layout-shell.sidebar-left > main {
  flex: 1 1 auto;
  min-width: 0;
}

/* ==========================================================================
   HEADER / NAVIGATION
   ========================================================================== */

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

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

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

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

.nav-link:hover {
  color: var(--color-accent);
  background-color: rgba(192, 57, 43, 0.06);
}

.nav-item.is-current .nav-link,
.nav-link.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background-color: rgba(192, 57, 43, 0.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  background-color: var(--color-heading);
  color: #c8cdd2;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-logo {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
}

.footer-slogan {
  font-size: 14px;
  color: #9aa3ab;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #9aa3ab;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.footer-link-col h3 {
  font-size: 15px;
  color: var(--color-white);
  margin-bottom: 12px;
}

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

.footer-link-list a {
  font-size: 14px;
  color: #9aa3ab;
}

.footer-link-list a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
}

.copyright {
  font-size: 13px;
  color: #7a838c;
}

/* ==========================================================================
   COMMON COMPONENTS
   ========================================================================== */

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

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

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

.breadcrumb-sep {
  color: #b0a89c;
}

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

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.3;
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 720px;
}

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 720px;
}

.section-desc {
  font-size: 14px;
  color: var(--color-text-light);
}

.section-heading {
  margin-bottom: 24px;
}

/* 相关推荐列表 */
.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-list li a {
  display: inline-block;
  font-size: 15px;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.related-list li a:hover {
  border-bottom-color: var(--color-accent);
}

.related-links {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   HOME PAGE
   ========================================================================== */

/* 焦点报道 */
.hero-section {
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 40px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.hero-image {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.hero-tag {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.hero-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.35;
}

.hero-summary {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-light);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition), color var(--transition);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-heading);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* 频道分类导航 */
.channel-nav-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.channel-tag {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text);
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

.channel-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgba(192, 57, 43, 0.04);
}

/* 最新资讯 */
.latest-news-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

.news-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr 1fr;
  gap: 24px;
}

.news-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.news-card-media {
  overflow: hidden;
}

.news-card-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.news-card-center .news-card-media img {
  height: 220px;
}

.news-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.news-category {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
}

.news-card-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.news-card-center .news-card-title {
  font-size: 19px;
}

.news-card-summary {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  flex: 1;
}

.news-card-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
}

.news-card-link:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* 专题推荐 */
.topics-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

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

.topic-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition);
}

.topic-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.topic-card-media {
  overflow: hidden;
}

.topic-card-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.topic-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.topic-card-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.topic-card-summary {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  flex: 1;
}

.topic-card-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
}

.topic-card-link:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* 编辑推荐 */
.editor-picks-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

.editor-picks-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.editor-pick-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.editor-pick-item:last-child {
  border-bottom: none;
}

.pick-number {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
  width: 48px;
  text-align: center;
}

.pick-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.pick-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.pick-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.pick-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 8px;
}

.pick-link:hover {
  text-decoration: underline;
}

/* 反馈区 */
.feedback-section {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  margin-top: 32px;
}

.feedback-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.feedback-inner .section-title {
  font-size: 20px;
}

.feedback-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 720px;
}

.feedback-links {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

.feedback-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.feedback-link:hover {
  border-bottom-color: var(--color-accent);
}

/* ==========================================================================
   CHANNELS PAGE
   ========================================================================== */

.channel-index {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: 84px;
}

.index-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.index-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-heading);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
}

.index-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.index-item a {
  display: block;
  padding: 10px 12px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

.index-item a:hover {
  background-color: rgba(192, 57, 43, 0.06);
  color: var(--color-accent);
}

.index-note {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.channel-list {
  margin-bottom: 48px;
}

.channel-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  transition: box-shadow var(--transition);
}

.channel-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.channel-media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.channel-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.channel-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.channel-name {
  font-size: 20px;
  font-weight: 600;
}

.channel-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.channel-tags li {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--color-text-light);
  background-color: var(--color-bg);
  padding: 4px 10px;
  border-radius: 12px;
}

.channel-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
  margin-top: 4px;
}

.channel-link:hover {
  text-decoration: underline;
}

/* 频道预览 */
.channel-preview {
  margin-top: 48px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.preview-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition);
}

.preview-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.preview-media {
  overflow: hidden;
}

.preview-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.preview-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.preview-channel {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
}

.preview-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
}

.preview-summary {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-light);
  flex: 1;
}

.preview-body a {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
}

.preview-body a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   TOPICS PAGE
   ========================================================================== */

.topic-section {
  margin-bottom: 48px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.topic-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition);
}

.topic-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.topic-media {
  overflow: hidden;
}

.topic-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.topic-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.topic-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.topic-summary {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  flex: 1;
}

.topic-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
}

.topic-link:hover {
  text-decoration: underline;
}

/* 专题入口 */
.topic-entry-section {
  margin-bottom: 48px;
}

.entry-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
}

.entry-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.entry-link {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-heading);
}

.entry-link:hover {
  color: var(--color-accent);
}

.entry-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.related-section {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   GUIDE PAGE
   ========================================================================== */

.guide-section {
  margin-bottom: 48px;
}

.method-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.method-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow var(--transition);
}

.method-item:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.method-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.method-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-heading);
}

.method-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.method-text a {
  color: var(--color-accent);
  font-weight: 500;
}

.method-text a:hover {
  text-decoration: underline;
}

.guide-figure {
  margin: 32px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.guide-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
  background-color: var(--color-white);
}

/* 网站功能说明 */
.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.feature-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.feature-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.feature-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.feature-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.related-reading {
  margin-top: 48px;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.related-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
}

/* ==========================================================================
   INSIGHT PAGE
   ========================================================================== */

.sidebar {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: 84px;
}

.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sidebar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-heading);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
}

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

.sidebar-item {
  padding: 12px;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
}

.sidebar-subtitle {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 6px;
}

.sidebar-text {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-light);
}

.content-section {
  margin-bottom: 48px;
}

.insight-card {
  display: flex;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  transition: box-shadow var(--transition);
}

.insight-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.insight-media {
  flex: 0 0 200px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.insight-media img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.insight-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.insight-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.insight-excerpt {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  flex: 1;
}

.insight-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
}

.insight-link:hover {
  text-decoration: underline;
}

/* 分析框架 */
.framework-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.framework-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.framework-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.framework-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.framework-note {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 16px;
  padding: 12px 16px;
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-md);
}

/* ==========================================================================
   404 PAGE
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-section {
  text-align: center;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.error-title {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.error-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
}

.error-home-link {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  background-color: var(--color-accent);
  color: var(--color-white);
  padding: 10px 28px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition);
}

.error-home-link:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
}

.error-help {
  margin-top: 24px;
  text-align: left;
  width: 100%;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.error-help-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-help-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.error-help-list li a {
  font-size: 14px;
  color: var(--color-accent);
}

.error-help-list li a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 1024px) {
  .news-grid {
    grid-template-columns: 1fr 1fr;
  }

  .news-card-center {
    grid-column: span 2;
  }

  .news-card-center .news-card-media img {
    height: 200px;
  }

  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .insight-card {
    flex-direction: column;
  }

  .insight-media {
    flex: none;
    width: 100%;
  }

  .insight-media img {
    height: 180px;
  }

  .layout-shell.sidebar-left {
    flex-direction: column;
  }

  .layout-shell.sidebar-left > aside {
    order: 0;
    width: 100%;
    flex: none;
    position: static;
  }

  .sidebar-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .framework-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 60px;
    padding: 0 16px;
  }

  .brand-name {
    font-size: 18px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px;
    gap: 0;
  }

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

  .nav-item {
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-link {
    padding: 14px 12px;
    font-size: 16px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    padding: 32px 16px;
    gap: 24px;
  }

  .hero-image {
    height: 220px;
  }

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

  .channel-nav-section,
  .latest-news-section,
  .topics-section,
  .editor-picks-section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .news-card-center {
    grid-column: span 1;
  }

  .news-card-center .news-card-media img {
    height: 180px;
  }

  .topics-grid {
    grid-template-columns: 1fr;
  }

  .editor-pick-item {
    flex-direction: column;
    gap: 12px;
  }

  .pick-number {
    width: auto;
    text-align: left;
  }

  .inner-main {
    padding: 24px 16px 48px;
  }

  .page-title {
    font-size: 26px;
  }

  .layout-shell {
    flex-direction: column;
  }

  .layout-shell > aside {
    width: 100%;
    flex: none;
    order: 2;
    position: static;
  }

  .layout-shell.sidebar-left > aside {
    order: 0;
  }

  .layout-shell.sidebar-left > main {
    order: 1;
  }

  .channel-card {
    grid-template-columns: 1fr;
  }

  .channel-media img {
    height: 180px;
  }

  .preview-grid {
    grid-template-columns: 1fr;
  }

  .topic-grid {
    grid-template-columns: 1fr;
  }

  .entry-list {
    grid-template-columns: 1fr;
  }

  .method-list {
    grid-template-columns: 1fr;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .sidebar-list {
    grid-template-columns: 1fr;
  }

  .framework-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px 16px 24px;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .feedback-inner {
    padding: 32px 16px;
  }

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

  .error-title {
    font-size: 36px;
  }
}

@media (max-width: 390px) {
  .brand-slogan {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    text-align: center;
    width: 100%;
  }

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

  .channel-tags {
    gap: 8px;
  }

  .channel-tag {
    padding: 6px 14px;
    font-size: 13px;
  }
}