/* ============================================================
   BASE — 基础变量、重置与全局排版
   ============================================================ */
:root {
  --color-ink: #1a1a1a;
  --color-gray-bg: #f5f5f5;
  --color-white: #ffffff;
  --color-accent: #c00000;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #e0e0e0;
  --font-heading: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "SimSun", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --header-height: 72px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --transition-fast: 0.2s ease;
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.06);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-ink);
  line-height: 1.3;
  font-weight: 700;
}

p {
  margin-bottom: 0.75em;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   LAYOUT — 全站统一页头、主容器、页脚骨架
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 2px solid var(--color-ink);
}

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

.brand-name {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 900;
  color: var(--color-ink);
  letter-spacing: 0.02em;
}

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

.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: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 2px solid transparent;
}

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

.nav-list li a.is-current {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
  padding: 10px;
}

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

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

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

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 14px;
  color: #999999;
  max-width: 480px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid #333333;
}

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

.footer-link-group ul li {
  margin-bottom: 6px;
}

.footer-link-group ul li a {
  color: #aaaaaa;
  font-size: 14px;
}

.footer-link-group ul li a:hover {
  color: var(--color-white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  gap: 16px;
}

.footer-bottom p {
  font-size: 13px;
  color: #888888;
  margin: 0;
}

.back-to-top {
  width: 44px;
  height: 44px;
  background-color: #333333;
  border: 1px solid #444444;
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-size: 20px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  flex-shrink: 0;
}

.back-to-top:hover {
  background-color: var(--color-accent);
}

/* ============================================================
   COMPONENTS — 通用组件：面包屑、页标题、区块标题、卡片等
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  color: #aaaaaa;
}

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

.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

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

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  position: relative;
  padding-left: 14px;
}

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

.section-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

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

/* ============================================================
   COMPONENTS — 首页模块
   ============================================================ */
.home-main {
  width: 100%;
}

/* 焦点报道区 */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 56px;
  background-color: var(--color-gray-bg);
}

.hero-media {
  min-width: 0;
}

.hero-figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.hero-figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

.hero-content {
  min-width: 0;
}

.hero-title {
  font-size: 32px;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-summary {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 24px;
}

.hero-cta {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.hero-cta:hover {
  background-color: #8f0000;
  color: var(--color-white);
}

/* 频道分类导航带 */
.channel-strip {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
  border-bottom: 1px solid var(--color-border);
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.channel-tag {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-gray-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

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

/* 最新动态列表 */
.latest-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.latest-list {
  margin-top: 24px;
}

.latest-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 24px;
}

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

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

.latest-item-title {
  font-size: 18px;
  font-weight: 600;
  grid-column: 1 / -1;
}

.latest-item-title a {
  color: var(--color-ink);
}

.latest-item-title a:hover {
  color: var(--color-accent);
}

.latest-item-summary {
  font-size: 14px;
  color: var(--color-text-light);
  grid-column: 1;
  margin: 0;
}

.latest-item-date {
  grid-column: 2;
  grid-row: 1;
  font-size: 13px;
  color: #999999;
  white-space: nowrap;
}

/* 专题推荐区 */
.topics-section {
  background-color: var(--color-gray-bg);
  padding: 48px 0;
}

.topics-section > .section-heading {
  max-width: var(--container-width);
  margin: 0 auto 24px;
  padding: 0 24px;
}

.topics-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  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-md);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

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

.topic-figure {
  overflow: hidden;
}

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

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

.topic-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

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

.topic-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 编辑推荐 */
.editor-picks {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.picks-list {
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
}

.pick-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.pick-title {
  font-size: 16px;
  font-weight: 600;
}

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

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

.pick-reason {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

/* 信息来源与反馈说明 */
.source-info {
  background-color: var(--color-gray-bg);
  padding: 48px 0;
}

.source-info .section-heading {
  max-width: var(--container-width);
  margin: 0 auto 24px;
  padding: 0 24px;
}

.source-info-body {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.source-info-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

.source-info-body p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   COMPONENTS — 频道分类页
   ============================================================ */
.channels-section {
  margin-bottom: 48px;
}

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

.channel-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

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

.channel-media {
  overflow: hidden;
}

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

.channel-body {
  padding: 20px 24px;
}

.channel-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

.channel-preview-section {
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
}

.preview-list {
  margin-top: 20px;
}

.preview-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 16px;
}

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

.preview-title {
  font-size: 15px;
  font-weight: 600;
  grid-column: 1;
}

.preview-summary {
  font-size: 14px;
  color: var(--color-text-light);
  grid-column: 1;
  margin: 0;
}

.preview-date {
  grid-column: 2;
  grid-row: 1;
  font-size: 13px;
  color: #999999;
  white-space: nowrap;
}

.section-more {
  margin-top: 16px;
  text-align: right;
}

.section-more a {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

/* 侧栏 */
.sidebar-content {
  min-width: 0;
}

.sidebar-inner {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-title {
  font-size: 20px;
  font-weight: 700;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-ink);
  margin-bottom: 20px;
}

.sidebar-block {
  margin-bottom: 24px;
}

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

.sidebar-block p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

.sidebar-note {
  font-size: 13px;
  color: #999999;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.sidebar-note a {
  color: var(--color-accent);
}

/* ============================================================
   COMPONENTS — 内容专题页
   ============================================================ */
.topics-grid .section-title {
  margin-bottom: 24px;
}

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

.topic-media {
  overflow: hidden;
}

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

.topic-excerpt {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.topic-link {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

.sidebar {
  min-width: 0;
}

.sidebar-links {
  margin-bottom: 24px;
}

.sidebar-links li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-links li a {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.5;
  display: block;
}

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

.topics-intro {
  max-width: var(--container-width);
  margin: 48px auto 0;
  padding: 40px 24px;
  border-top: 1px solid var(--color-border);
}

.topics-intro p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 800px;
}

/* ============================================================
   COMPONENTS — 阅读指南页
   ============================================================ */
.guide-section {
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.guide-section:last-of-type {
  border-bottom: none;
}

.guide-section .section-title {
  margin-bottom: 20px;
}

.guide-content-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.guide-figure {
  overflow: hidden;
  border-radius: var(--radius-md);
}

.guide-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.guide-figure figcaption {
  font-size: 13px;
  color: #999999;
  padding: 8px 0 0;
  text-align: center;
}

.guide-content-block p {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 12px;
}

.guide-content-block p:last-child {
  margin-bottom: 0;
}

.tips-list {
  counter-reset: tip-counter;
}

.tips-list li {
  position: relative;
  padding: 12px 0 12px 40px;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
  line-height: 1.6;
}

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

.tips-list li::before {
  counter-increment: tip-counter;
  content: counter(tip-counter);
  position: absolute;
  left: 0;
  top: 12px;
  width: 28px;
  height: 28px;
  background-color: var(--color-ink);
  color: var(--color-white);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.faq-accordion {
  display: grid;
  gap: 12px;
}

.faq-accordion .faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
}

.faq-accordion .faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
}

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

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

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

.faq-accordion .faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.guide-related-links {
  background-color: var(--color-gray-bg);
  padding: 24px;
  border-radius: var(--radius-md);
  margin-top: 40px;
}

.guide-related-links p {
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 0;
}

.guide-related-links a {
  color: var(--color-accent);
  margin-right: 16px;
  display: inline-block;
  padding: 4px 0;
}

/* ============================================================
   COMPONENTS — 深度解读页
   ============================================================ */
.insights-list-section {
  margin-bottom: 32px;
}

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

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

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

.insight-media {
  overflow: hidden;
  border-radius: var(--radius-sm);
}

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

.insight-content {
  min-width: 0;
}

.insight-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.insight-content h3 a {
  color: var(--color-ink);
}

.insight-content h3 a:hover {
  color: var(--color-accent);
}

.insight-date {
  font-size: 13px;
  color: #999999;
  margin-bottom: 8px;
}

.insight-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.read-more {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

.related-insights-section {
  margin-bottom: 32px;
}

.related-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.related-list li a {
  font-size: 14px;
  line-height: 1.5;
  display: block;
}

.insight-note {
  background-color: var(--color-gray-bg);
  padding: 20px;
  border-radius: var(--radius-sm);
}

.insight-note h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.insight-note p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ============================================================
   COMPONENTS — 常见问题页
   ============================================================ */
.faq-section {
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.faq-section:last-of-type {
  border-bottom: none;
}

.faq-section .section-title {
  margin-bottom: 20px;
}

.content-media {
  margin-bottom: 24px;
}

.content-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.content-media figcaption {
  font-size: 13px;
  color: #999999;
  padding: 8px 0 0;
  text-align: center;
}

.content-media-inline {
  max-width: 640px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  margin-bottom: 12px;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
}

.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;
  color: var(--color-accent);
  font-weight: 400;
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.related-links {
  background-color: var(--color-gray-bg);
  padding: 24px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}

.related-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

.related-links ul li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.related-links ul li:last-child {
  border-bottom: none;
}

.related-links ul li a {
  font-size: 14px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-right: 12px;
}

.related-links-item {
  font-size: 14px;
  color: var(--color-accent);
  margin-right: 16px;
  display: inline-block;
  padding: 4px 0;
}

/* ============================================================
   COMPONENTS — 404 错误页
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-section {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-family: var(--font-heading);
  font-size: 96px;
  font-weight: 900;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 28px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

.error-link {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-ink);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

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

.error-nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.error-nav a {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.error-nav a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================================
   PAGES — 页面级修饰（仅允许调整业务模块内部）
   ============================================================ */
.page-channels .channel-grid {
  grid-template-columns: repeat(2, 1fr);
}

.page-topics .topic-cards {
  grid-template-columns: repeat(2, 1fr);
}

/* ============================================================
   RESPONSIVE — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
    padding: 32px 24px 40px;
  }

  .hero-figure img {
    height: 300px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 32px;
  }

  .insight-item {
    grid-template-columns: 160px 1fr;
    gap: 20px;
  }
}

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

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

  .brand-slogan {
    font-size: 11px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 2px solid var(--color-ink);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

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

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

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

  .nav-list li a.is-current {
    border-bottom-color: var(--color-accent);
  }

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

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

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

  .hero-section {
    padding: 24px 16px 32px;
  }

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

  .hero-figure img {
    height: 220px;
  }

  .hero-cta {
    padding: 10px 24px;
    font-size: 14px;
  }

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

  .topics-section > .section-heading,
  .topics-grid,
  .source-info .section-heading,
  .source-info-body {
    padding-left: 16px;
    padding-right: 16px;
  }

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

  .latest-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .latest-item-date {
    grid-column: 1;
    grid-row: auto;
  }

  .page-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .sidebar-content,
  .sidebar {
    order: 2;
  }

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

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

  .guide-content-block {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .guide-figure img {
    height: 180px;
  }

  .insight-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  .footer-inner {
    padding: 32px 16px 24px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .error-code {
    font-size: 72px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 12px;
  }

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

  .brand-slogan {
    font-size: 10px;
  }

  .inner-main {
    padding: 20px 12px 40px;
  }

  .breadcrumb {
    font-size: 13px;
    margin-bottom: 16px;
  }

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

  .hero-section {
    padding: 20px 12px 28px;
  }

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

  .hero-summary {
    font-size: 15px;
  }

  .hero-figure img {
    height: 180px;
  }

  .channel-strip,
  .latest-section,
  .editor-picks {
    padding-left: 12px;
    padding-right: 12px;
  }

  .topics-section > .section-heading,
  .topics-grid,
  .source-info .section-heading,
  .source-info-body {
    padding-left: 12px;
    padding-right: 12px;
  }

  .topic-figure img,
  .topic-media img {
    height: 160px;
  }

  .topic-body {
    padding: 16px;
  }

  .topic-title {
    font-size: 18px;
  }

  .latest-item-title {
    font-size: 16px;
  }

  .pick-item {
    padding: 12px 0;
  }

  .channel-media img {
    height: 140px;
  }

  .channel-body {
    padding: 16px;
  }

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

  .preview-date {
    grid-column: 1;
    grid-row: auto;
  }

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

  .faq-item summary {
    padding: 14px 16px;
    font-size: 14px;
  }

  .faq-item p {
    padding: 0 16px 14px;
    font-size: 13px;
  }

  .error-main {
    padding: 60px 16px;
  }

  .error-code {
    font-size: 64px;
  }

  .error-section h1 {
    font-size: 22px;
  }
}