/* ============================================================
   BASE — 基础变量、重置与全局元素
   ============================================================ */
:root {
  --color-bg: #f5f5f5;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  --color-border: #e5e5e5;
  --color-card: #ffffff;
  --color-blue: #4a90d9;
  --color-blue-dark: #3a7bc0;
  --color-green: #50b5a0;
  --color-green-dark: #3d9a86;
  --color-orange: #e8a87c;
  --color-orange-dark: #d18f5f;
  --color-lavender: #9b8ec9;
  --color-rose: #c98a9b;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --container-padding: 0 24px;
  --header-height: 72px;
  --radius: 8px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

ul,
ol {
  list-style: none;
}

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

a:hover {
  color: var(--color-blue-dark);
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

p {
  color: var(--color-text);
}

time {
  color: var(--color-text-lighter);
  font-size: 0.875rem;
}

/* ============================================================
   LAYOUT — 全站骨架：页头、导航、页脚、主容器
   ============================================================ */

/* --- 全站骨架 class（程序锁定） --- */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
}

.site-header {
  background-color: #fff;
  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;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-name {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.brand-slogan {
  font-size: 0.75rem;
  color: var(--color-text-lighter);
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

.nav-list li a:hover {
  color: var(--color-blue);
  background-color: rgba(74, 144, 217, 0.08);
}

.nav-list li a.is-current {
  color: var(--color-blue);
  font-weight: 600;
  background-color: rgba(74, 144, 217, 0.12);
}

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

.nav-toggle:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.site-main {
  flex: 1;
}

.site-footer {
  background-color: #2b2b2b;
  color: #c8c8c8;
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 0.875rem;
  color: #9a9a9a;
  line-height: 1.6;
  max-width: 300px;
}

.footer-group-title {
  font-size: 0.9375rem;
  color: #fff;
  margin-bottom: 14px;
  font-weight: 600;
}

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

.footer-link-list a {
  color: #9a9a9a;
  font-size: 0.875rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  padding: 16px 24px;
  font-size: 0.8125rem;
  color: #777;
}

/* --- 内页统一骨架 --- */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 0;
  width: 100%;
}

.breadcrumb {
  font-size: 0.875rem;
  color: var(--color-text-lighter);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  color: #ccc;
}

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

.page-header {
  margin-bottom: 36px;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.3;
}

.page-description {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: 720px;
  line-height: 1.7;
}

/* --- 通用区块标题 --- */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

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

.section-description,
.section-intro {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 720px;
  line-height: 1.7;
}

/* ============================================================
   COMPONENTS — 按钮、卡片、标签、列表等通用组件
   ============================================================ */

/* --- 按钮 --- */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition),
    color var(--transition);
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--color-blue-dark);
  color: #fff;
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

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

/* --- 频道标签（首页） --- */
.channel-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.channel-tag {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  background-color: #fff;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.channel-tag:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  color: var(--color-text);
}

.tag-entertainment {
  border-left: 3px solid var(--color-orange);
}

.tag-society {
  border-left: 3px solid var(--color-blue);
}

.tag-technology {
  border-left: 3px solid var(--color-green);
}

.tag-lifestyle {
  border-left: 3px solid var(--color-lavender);
}

.tag-culture {
  border-left: 3px solid var(--color-rose);
}

/* --- 通用图片容器 --- */
figure,
.topic-cover,
.channel-media,
.topic-media,
.insight-media,
.hero-figure {
  overflow: hidden;
  border-radius: var(--radius);
  background-color: #eee;
}

figure img,
.topic-cover img,
.channel-media img,
.topic-media img,
.insight-media img,
.hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================================
   PAGES — 首页
   ============================================================ */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* --- 首屏焦点区 --- */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 48px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

.hero-description {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 460px;
}

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

.hero-figure {
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

/* --- 频道分类导航带 --- */
.channel-nav-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background-color: #fafafa;
  margin: 0 -24px;
  padding-left: 24px;
  padding-right: 24px;
}

.channel-nav-section .section-title,
.channel-nav-section .section-description {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

.channel-tag-list {
  max-width: var(--container-width);
  margin: 0 auto;
}

/* --- 最新资讯 --- */
.latest-news-section {
  padding: 48px 0 8px;
}

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

.news-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.news-item:first-child {
  padding-top: 0;
}

.news-title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
}

.news-title a {
  color: var(--color-text);
}

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

.news-summary {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
  max-width: 820px;
}

.news-date {
  font-size: 0.8125rem;
  color: var(--color-text-lighter);
}

/* --- 专题推荐 --- */
.topic-cards-section {
  padding: 48px 0 8px;
}

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

.topic-card {
  background-color: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
}

.topic-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.topic-cover {
  aspect-ratio: 16 / 9;
  border-radius: 0;
}

.topic-card-body {
  padding: 20px 24px 24px;
}

.topic-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.topic-card-title a:hover {
  color: var(--color-blue);
}

.topic-card-excerpt {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- 编辑推荐 --- */
.editor-picks-section {
  padding: 48px 0 8px;
}

.editor-pick-list {
  display: flex;
  flex-direction: column;
}

.editor-pick-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.editor-pick-item:first-child {
  padding-top: 0;
}

.editor-pick-title {
  font-size: 1.0625rem;
  font-weight: 600;
}

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

.editor-pick-title a:hover {
  color: var(--color-blue);
}

.editor-pick-reason {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- 信息来源与反馈 --- */
.source-info-section {
  padding: 40px 0;
  margin-top: 40px;
  border-top: 1px solid var(--color-border);
  background-color: #fafafa;
  margin-left: -24px;
  margin-right: -24px;
  padding-left: 24px;
  padding-right: 24px;
}

.source-info-section .section-title,
.source-info-section > p {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

.source-info-section > p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.feedback-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.feedback-links a {
  color: var(--color-blue);
  font-size: 0.9375rem;
  font-weight: 500;
}

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

/* ============================================================
   PAGES — 频道分类页
   ============================================================ */

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

.channel-item {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: center;
}

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

.channel-media {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
}

.channel-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.channel-sample {
  font-size: 0.875rem;
  color: var(--color-text-lighter);
  line-height: 1.6;
}

/* --- 频道预览 --- */
.channel-preview {
  margin-bottom: 16px;
}

.preview-intro {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 1.7;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.preview-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow var(--transition);
}

.preview-card:hover {
  box-shadow: var(--shadow-sm);
}

.preview-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.preview-text {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.preview-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  padding: 16px 20px;
  background-color: #fafafa;
  border-radius: var(--radius);
  border-left: 3px solid var(--color-green);
}

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

/* ============================================================
   PAGES — 内容专题页
   ============================================================ */

.page-layout {
  display: flex;
  flex-direction: row;
  gap: 40px;
  align-items: flex-start;
}

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

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

.topic-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

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

.topic-media {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
}

.topic-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.topic-title a {
  color: var(--color-text);
}

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

.topic-summary {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.topic-meta {
  font-size: 0.8125rem;
  color: var(--color-text-lighter);
  margin-bottom: 8px;
}

.topic-link {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* --- 专题摘要 --- */
.topic-summaries {
  margin-bottom: 16px;
}

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

.summary-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow var(--transition);
}

.summary-card:hover {
  box-shadow: var(--shadow-sm);
}

.summary-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.summary-text {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
}

.summary-source {
  font-size: 0.8125rem;
  color: var(--color-text-lighter);
}

/* --- 侧栏 --- */
.sidebar {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-text {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

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

.sidebar-links a {
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.5;
  display: inline-block;
}

.sidebar-links a:hover {
  color: var(--color-blue);
}

/* --- 来源说明 --- */
.source-note {
  margin-top: 48px;
  padding: 24px;
  background-color: #fafafa;
  border-radius: var(--radius);
  border-left: 3px solid var(--color-green);
}

.source-note p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================================================
   PAGES — 实用指南页
   ============================================================ */

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

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.guide-step {
  display: flex;
  gap: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow var(--transition);
}

.guide-step:hover {
  box-shadow: var(--shadow-sm);
}

.step-number {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: rgba(74, 144, 217, 0.12);
  color: var(--color-blue);
  font-size: 1.125rem;
  font-weight: 700;
}

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

.step-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- 指南关联 --- */
.guide-related {
  margin-bottom: 16px;
}

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

.related-link-item {
  padding: 16px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.related-link-item a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
}

.related-link-item a:hover {
  color: var(--color-blue);
}

.related-link-desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- 安全提示（指南页） --- */
.safety-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.safety-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.safety-item-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  flex-shrink: 0;
  min-width: 90px;
}

.safety-item-text {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.tip-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.tip-text {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.tracking-tip {
  padding: 16px 20px;
  background-color: rgba(80, 181, 160, 0.08);
  border-left: 3px solid var(--color-green);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-top: 16px;
}

.guide-figure {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  margin: 20px 0;
}

/* ============================================================
   PAGES — 深度解读页
   ============================================================ */

.layout-shell {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.article-content {
  flex: 1;
  min-width: 0;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.insight-articles {
  margin-bottom: 48px;
}

.insight-articles h2,
.insight-framework h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
}

.insight-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.insight-item:first-child {
  padding-top: 0;
}

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

.insight-media {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
}

.insight-body h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.insight-body h3 a {
  color: var(--color-text);
}

.insight-body h3 a:hover {
  color: var(--color-blue);
}

.insight-meta {
  font-size: 0.8125rem;
  color: var(--color-text-lighter);
  margin-bottom: 10px;
}

.insight-body p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* --- 分析框架 --- */
.insight-framework {
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.framework-list {
  margin: 16px 0 16px;
  padding-left: 0;
}

.framework-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

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

.framework-list strong {
  color: var(--color-text);
  font-weight: 600;
  margin-right: 6px;
}

.insight-framework > p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* --- 相关推荐侧栏 --- */
.related-sidebar {
  width: 300px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.related-box,
.related-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.related-box h3,
.related-note h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.related-list li {
  margin-bottom: 10px;
}

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

.related-list a {
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.5;
  display: inline-block;
}

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

.related-note p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================================================
   PAGES — 404 页
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-panel {
  text-align: center;
  max-width: 560px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 48px 40px;
}

.error-code {
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-blue);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.error-help {
  font-size: 0.875rem;
  color: var(--color-text-lighter);
  line-height: 1.6;
}

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

/* --- 平板及以下 --- */
@media (max-width: 1024px) {
  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .sidebar {
    width: 240px;
  }

  .related-sidebar {
    width: 260px;
  }

  .channel-item {
    grid-template-columns: 200px 1fr;
  }

  .topic-item {
    grid-template-columns: 180px 1fr;
  }

  .insight-item {
    grid-template-columns: 160px 1fr;
    gap: 16px;
  }
}

/* --- 手机断点 --- */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 16px;
    height: var(--header-height);
    gap: 16px;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .brand-slogan {
    font-size: 0.6875rem;
  }

  /* 移动导航 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: static;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    z-index: 99;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .site-header {
    position: sticky;
  }

  /* 首页 */
  .home-main {
    padding: 0 16px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0 32px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-description {
    font-size: 1rem;
  }

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

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    width: 100%;
  }

  .hero-figure {
    aspect-ratio: 16 / 10;
  }

  .channel-nav-section {
    margin: 0 -16px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .channel-tag-list {
    gap: 8px;
  }

  .channel-tag {
    padding: 6px 14px;
    font-size: 0.875rem;
    min-height: 40px;
  }

  .latest-news-section,
  .topic-cards-section,
  .editor-picks-section {
    padding: 32px 0 4px;
  }

  .topic-card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .source-info-section {
    margin: 32px -16px 0;
    padding-left: 16px;
    padding-right: 16px;
  }

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

  /* 内页 */
  .inner-main {
    padding: 24px 16px 0;
  }

  .breadcrumb {
    margin-bottom: 16px;
    font-size: 0.8125rem;
  }

  .page-header {
    margin-bottom: 28px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1.25rem;
  }

  /* 频道页 */
  .channel-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px 0;
  }

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

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

  /* 专题页 */
  .page-layout {
    flex-direction: column;
    gap: 32px;
  }

  .main-content {
    width: 100%;
  }

  .topic-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px 0;
  }

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

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

  .sidebar {
    width: 100%;
    position: static;
  }

  .source-note {
    margin-top: 32px;
  }

  /* 指南页 */
  .guide-section {
    margin-bottom: 32px;
  }

  .guide-step {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .step-number {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

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

  .safety-item-title {
    min-width: 0;
  }

  /* 解读页 */
  .layout-shell {
    flex-direction: column;
    gap: 32px;
  }

  .article-content {
    padding: 20px;
    width: 100%;
  }

  .insight-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px 0;
  }

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

  .related-sidebar {
    width: 100%;
    position: static;
  }

  /* 404 */
  .error-main {
    padding: 48px 16px;
  }

  .error-panel {
    padding: 32px 24px;
  }

  .error-code {
    font-size: 3rem;
  }

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

  .error-actions .btn-primary,
  .error-actions .btn-secondary {
    width: 100%;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 16px 20px;
  }

  .footer-brand-desc {
    max-width: 100%;
  }

  .footer-bottom {
    padding: 14px 16px;
  }
}

/* --- 小屏手机 --- */
@media (max-width: 390px) {
  .brand-slogan {
    display: none;
  }

  .channel-tag {
    padding: 6px 10px;
    font-size: 0.8125rem;
  }

  .hero-title {
    font-size: 1.5rem;
  }

  .topic-card-body {
    padding: 16px;
  }

  .article-content {
    padding: 16px;
  }

  .insight-body h3 {
    font-size: 1rem;
  }

  .summary-card,
  .preview-card,
  .sidebar-card,
  .related-box,
  .related-note {
    padding: 16px;
  }

  .guide-step {
    padding: 16px;
  }

  .related-link-item {
    padding: 14px 16px;
  }
}