/* ==========================================================================
   51吃瓜娜娜 - 全站样式表
   视觉方向：公共交通风（线路色、站点编号、高对比、紧凑信息）
   ========================================================================== */

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

:root {
  --color-primary: #1F4E79;
  --color-primary-dark: #163A5A;
  --color-accent: #F39C12;
  --color-accent-dark: #D68910;
  --color-bg: #F5F7FA;
  --color-text: #333333;
  --color-text-light: #5D6D7E;
  --color-border: #D5D8DC;
  --color-white: #FFFFFF;
  --color-line-light: #E8ECF1;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  --container-width: 1200px;
  --header-height: 68px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.5em;
  line-height: 1.3;
  color: var(--color-text);
  font-weight: 700;
}

p {
  margin: 0 0 1em;
}

figure {
  margin: 0;
}

time {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--color-text-light);
}

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

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.site-header {
  background-color: var(--color-white);
  border-bottom: 3px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.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;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-name {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.brand-slogan {
  font-size: 13px;
  color: var(--color-text-light);
  border-left: 2px solid var(--color-accent);
  padding-left: 10px;
  line-height: 1.4;
  display: none;
}

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

.site-nav .nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.site-nav .nav-list li a:hover {
  color: var(--color-primary);
  background-color: rgba(31, 78, 121, 0.06);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
  line-height: 0;
}

.nav-toggle-icon {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  position: relative;
  transition: background-color var(--transition-fast);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.nav-toggle-icon::before {
  top: -7px;
}

.nav-toggle-icon::after {
  top: 7px;
}

.site-main {
  min-height: 60vh;
}

.site-main.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.site-main.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 56px;
}

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

.layout-shell .site-main.inner-main {
  max-width: none;
  margin: 0;
  padding: 32px 0 56px;
}

.layout-shell > .sidebar {
  padding-top: 32px;
}

.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 40px;
}

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

.footer-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

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

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 20px;
  margin-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom p {
  margin: 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

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

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 36px;
}

.page-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.25;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
  margin: 0;
}

/* 通用区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  position: relative;
  padding-left: 14px;
  margin-bottom: 24px;
}

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

.section-intro {
  color: var(--color-text-light);
  margin-bottom: 20px;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  line-height: 1.4;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background-color: rgba(31, 78, 121, 0.08);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   Components
   -------------------------------------------------------------------------- */

/* 首页焦点报道 */
.hero-focus {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.focus-copy h1 {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 16px;
}

.focus-lead {
  font-size: 17px;
  color: var(--color-text-light);
  margin-bottom: 28px;
  max-width: 480px;
}

.focus-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

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

.focus-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

/* 频道导航带 */
.channel-strip {
  margin-bottom: 48px;
}

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

.channel-tag {
  display: inline-block;
  padding: 8px 18px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.channel-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: rgba(31, 78, 121, 0.04);
  transform: translateY(-2px);
}

/* 快讯列表 */
.latest-news {
  margin-bottom: 48px;
}

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

.news-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.news-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  transform: translateX(4px);
}

.news-item h3 {
  margin-bottom: 6px;
  font-size: 17px;
}

.news-item h3 a {
  color: var(--color-text);
  font-weight: 700;
}

.news-item h3 a:hover {
  color: var(--color-primary);
}

.news-summary {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

/* 专题推荐 */
.featured-topics {
  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-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.topic-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

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

.topic-card h3 {
  padding: 16px 20px 4px;
  font-size: 18px;
  margin-bottom: 4px;
}

.topic-card h3 a {
  color: var(--color-text);
}

.topic-card h3 a:hover {
  color: var(--color-primary);
}

.topic-card p {
  padding: 0 20px 20px;
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

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

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

.pick-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  transition: box-shadow var(--transition-fast);
}

.pick-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.pick-rank {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
  min-width: 40px;
  text-align: center;
}

.pick-content h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

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

/* 信息来源 */
.source-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 48px;
}

.source-note p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.text-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
}

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

/* 频道分类页 */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.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-base), transform var(--transition-base);
}

.channel-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

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

.channel-body {
  padding: 16px 20px 20px;
}

.channel-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  position: relative;
  padding-left: 16px;
}

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

.channel-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 12px;
  line-height: 1.5;
}

.channel-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

.channel-link:hover::after {
  transform: translateX(4px);
}

/* 频道指南区 */
.channel-guide-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.guide-content p {
  color: var(--color-text-light);
  font-size: 15px;
}

.guide-content a {
  font-weight: 600;
}

/* 频道侧栏 */
.channel-aside {
  margin-bottom: 40px;
}

.aside-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.aside-card h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

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

.aside-links li a {
  font-size: 14px;
  color: var(--color-text);
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.aside-links li a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* 专题页 */
.section {
  margin-bottom: 48px;
}

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

.topic-list .topic-card a {
  display: block;
  margin: 0 20px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.topic-intro {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 48px;
}

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

.topic-intro p:last-child {
  margin-bottom: 0;
}

/* 侧栏通用 */
.related-links {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.related-links h2 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

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

.related-links ul li a {
  font-size: 14px;
  color: var(--color-text);
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.related-links ul li a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* 深度解读页 */
.analysis-framework {
  margin-bottom: 48px;
}

.analysis-framework > p {
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.framework-steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.step-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.step-item h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.step-item h3::before {
  content: attr(data-step);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.framework-media {
  margin-top: 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.framework-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.framework-media figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-white);
}

/* 案例解读 */
.case-analysis {
  margin-bottom: 48px;
}

.case-analysis > p {
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.case-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 24px;
}

.case-item h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.case-item > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.case-points {
  margin-bottom: 16px;
}

.case-points li {
  font-size: 14px;
  color: var(--color-text);
  padding: 6px 0 6px 20px;
  position: relative;
  line-height: 1.6;
}

.case-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.case-points li strong {
  color: var(--color-primary);
  font-weight: 700;
}

.case-media {
  margin-top: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.case-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.case-media figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

/* 相关阅读 */
.related-reading {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 48px;
}

.related-reading h2 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.related-reading > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.related-links li a {
  font-size: 14px;
  color: var(--color-text);
  display: inline-block;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  line-height: 1.5;
}

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

/* 侧栏卡片 */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.sidebar-card h2,
.sidebar-title {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

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

.sidebar-card ul li a {
  font-size: 14px;
  color: var(--color-text);
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.sidebar-card ul li a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* 历史归档页 */
.archive-year-index {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.year-jump-list {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.year-jump-link {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.year-jump-link:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
  transform: translateY(-2px);
}

.archive-month-summary {
  margin-bottom: 40px;
}

.archive-year-block {
  margin-bottom: 40px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.archive-year-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-primary);
  border-bottom: 3px solid var(--color-primary);
  padding-bottom: 8px;
  margin-bottom: 24px;
  display: inline-block;
}

.month-group {
  margin-bottom: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
}

.month-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.month-title::before {
  content: "";
  width: 10px;
  height: 10px;
  background-color: var(--color-accent);
  border-radius: 2px;
  flex-shrink: 0;
}

.archive-list li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

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

.archive-list li a {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  flex: 1;
}

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

.archive-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-light);
  flex-shrink: 0;
}

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

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

.archive-decorative-figure figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-white);
}

/* 阅读指南页 */
.page-layout.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

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

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

.guide-section > p {
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.guide-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-bottom: 16px;
}

.guide-block h3 {
  font-size: 17px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.guide-block p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
  line-height: 1.6;
}

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

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

.guide-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-white);
}

.sidebar-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.sidebar-block h2 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

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

.sidebar-links li a {
  font-size: 14px;
  color: var(--color-text);
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.sidebar-links li a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* 404 页面 */
.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px;
  min-height: 60vh;
}

.error-panel {
  text-align: center;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 56px 32px;
  margin-bottom: 40px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 28px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

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

.error-help {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.error-help h2 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.error-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 24px;
}

.error-links li a {
  font-size: 15px;
  color: var(--color-text);
  display: inline-block;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
}

.error-links li a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Pages
   -------------------------------------------------------------------------- */

/* 首页 */
.site-home {
  background-color: var(--color-bg);
}

/* 频道页 */
.page-channels .inner-main {
  padding-bottom: 40px;
}

/* 专题页 */
.page-special .inner-main {
  padding-bottom: 40px;
}

/* 深度解读页 */
.page-insight .inner-main {
  padding-bottom: 40px;
}

/* 归档页 */
.page-archive .inner-main {
  padding-bottom: 40px;
}

/* 阅读指南页 */
.page-guide .inner-main {
  padding-bottom: 40px;
}

/* 404 页 */
.site-error {
  background-color: var(--color-bg);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (min-width: 769px) {
  .brand-slogan {
    display: inline-block;
  }
}

@media (max-width: 1024px) {
  .channel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .layout-shell {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 24px;
  }

  .page-layout.guide-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: var(--header-height);
    padding: 12px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .brand-logo {
    margin-right: auto;
  }

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

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: block;
    order: 3;
  }

  .site-nav {
    flex-basis: 100%;
    order: 4;
  }

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

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

  .site-nav .nav-list li a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--color-line-light);
    border-radius: 0;
    font-size: 15px;
  }

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

  .site-nav .nav-list li a.is-current {
    background-color: rgba(31, 78, 121, 0.06);
    border-bottom-color: var(--color-line-light);
  }

  .site-main.home-main {
    padding: 0 16px;
  }

  .site-main.inner-main {
    padding: 24px 16px 40px;
  }

  .layout-shell {
    display: block;
    padding: 0 16px;
  }

  .layout-shell .site-main.inner-main {
    padding: 24px 0 40px;
  }

  .layout-shell > .sidebar {
    padding-top: 0;
    margin-top: 32px;
  }

  .footer-inner {
    padding: 32px 16px 20px;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 4px;
  }

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

  .focus-copy h1 {
    font-size: 28px;
  }

  .focus-media img {
    height: 220px;
  }

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

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

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

  .page-layout.guide-layout {
    display: block;
  }

  .sidebar {
    margin-top: 32px;
  }

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

  .error-main {
    padding: 40px 16px;
  }

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

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

  .archive-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .pick-item {
    gap: 12px;
  }

  .pick-rank {
    font-size: 22px;
    min-width: 32px;
  }

  .case-item {
    padding: 20px;
  }

  .news-item {
    padding: 16px 20px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 10px 12px;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .focus-cta {
    flex-direction: column;
  }

  .focus-cta .btn {
    width: 100%;
  }

  .channel-tags {
    gap: 8px;
  }

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

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

  .topic-card h3 {
    font-size: 16px;
  }

  .year-jump-list {
    gap: 8px;
  }

  .year-jump-link {
    padding: 6px 14px;
    font-size: 14px;
  }

  .error-actions {
    flex-direction: column;
  }

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

  .framework-media img,
  .case-media img,
  .guide-figure img {
    height: 180px;
  }
}