/* ============================================================
   911吃瓜网 - 全站样式表
   工艺品牌风：温暖中性底色，细节边框，编号系统
   ============================================================ */

/* ============================================================
   Base
   ============================================================ */

:root {
  --color-bg: #f5f0e8;
  --color-bg-alt: #efe8dc;
  --color-surface: #fffdf8;
  --color-text: #3e3a36;
  --color-text-light: #6b655c;
  --color-text-muted: #8a8378;
  --color-accent: #c0392b;
  --color-accent-dark: #a93226;
  --color-blue: #2c3e50;
  --color-orange: #e67e22;
  --color-border: #ddd5c8;
  --color-border-light: #e8e1d5;
  --header-height: 72px;
  --container-width: 1200px;
  --container-padding: 24px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --shadow-sm: 0 1px 2px rgba(62, 58, 54, 0.06);
  --shadow-md: 0 2px 8px rgba(62, 58, 54, 0.08);
  --shadow-lg: 0 4px 16px rgba(62, 58, 54, 0.1);
}

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

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

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

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 0;
}

.sr-only {
  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-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
}

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

.site-main.home-main {
  padding-bottom: 64px;
}

.site-main.inner-main {
  padding-bottom: 64px;
}

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

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  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: 22px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

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

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

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 44px;
  height: 44px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
  position: relative;
}

.nav-toggle-icon {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
  transition: background-color 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: transform 0.2s ease;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

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

/* 页脚 */
.site-footer {
  background-color: var(--color-blue);
  color: #c8cdd2;
  flex-shrink: 0;
}

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

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

.footer-tagline {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #aeb6bd;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.footer-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: #aeb6bd;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px var(--container-padding);
  text-align: center;
  font-size: 13px;
  color: #8a939b;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
}

/* 面包屑 */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px var(--container-padding) 0;
  font-size: 14px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

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

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

/* 内页通用标题区 */
.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 28px var(--container-padding) 8px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
  line-height: 1.7;
}

/* 通用 section 标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 20px;
  position: relative;
  padding-left: 14px;
}

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

/* 通用容器 */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

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

.sidebar-block {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.sidebar-block h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-blue);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-links li {
  margin-bottom: 10px;
}

.sidebar-links li:last-child {
  margin-bottom: 0;
}

.sidebar-links a {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.5;
  display: inline-block;
  transition: color 0.2s ease;
}

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

/* ============================================================
   Components
   ============================================================ */

/* ---------- 首页 hero ---------- */
.hero-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px var(--container-padding) 32px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-blue);
  line-height: 1.25;
}

.hero-description {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 520px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  width: fit-content;
  transition: background-color 0.2s ease;
}

.hero-cta:hover {
  background-color: var(--color-accent-dark);
  color: #fff;
}

.hero-media {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-figure {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-lg);
}

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

/* ---------- 频道标签条 ---------- */
.channel-strip {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px var(--container-padding) 8px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag-item {
  display: inline-block;
  padding: 8px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  font-size: 14px;
  color: var(--color-text);
  transition: all 0.2s ease;
}

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

/* ---------- 首页最新资讯 ---------- */
.latest-news {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

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

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

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

.news-item h3 {
  font-size: 18px;
}

.news-item h3 a {
  color: var(--color-blue);
  transition: color 0.2s ease;
}

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

.news-meta {
  font-size: 13px;
  color: var(--color-text-muted);
}

.news-summary {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---------- 首页专题卡片 ---------- */
.featured-topics {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

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

.topic-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

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

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

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

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

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

.topic-excerpt {
  padding: 0 20px 20px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---------- 首页编辑推荐 ---------- */
.editor-picks {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

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

.pick-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  align-items: flex-start;
  transition: box-shadow 0.2s ease;
}

.pick-item:hover {
  box-shadow: var(--shadow-sm);
}

.pick-index {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-orange);
  line-height: 1;
  flex-shrink: 0;
  min-width: 32px;
}

.pick-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

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

.pick-content h3 a {
  color: var(--color-blue);
}

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

.pick-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---------- 信息来源与反馈 ---------- */
.source-feedback {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

.source-feedback p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 10px;
  max-width: 720px;
}

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

/* ---------- 频道网格（pindao） ---------- */
.channel-grid-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

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

.channel-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

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

.channel-figure {
  overflow: hidden;
}

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

.channel-body {
  padding: 16px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.channel-body h3 {
  font-size: 17px;
  color: var(--color-blue);
}

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

.channel-body a {
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.channel-intro-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

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

.intro-item {
  background-color: var(--color-surface);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 16px 20px;
}

.intro-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--color-blue);
}

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

.related-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

.related-section p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.related-section p a {
  font-weight: 500;
}

/* ---------- 专题列表（zhuanti） ---------- */
.topic-list-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

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

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

.topic-media {
  overflow: hidden;
}

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

.topic-content {
  padding: 16px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.topic-content h3 {
  font-size: 18px;
}

.topic-content h3 a {
  color: var(--color-blue);
}

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

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

.topic-content a {
  font-size: 14px;
  font-weight: 500;
  margin-top: auto;
}

.topic-intro-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 8px;
}

.intro-block {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.intro-block p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ---------- 解读列表（jiedu） ---------- */
.reading-list {
  padding: 32px 0 8px;
}

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

.reading-item {
  display: flex;
  gap: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: box-shadow 0.2s ease;
}

.reading-item:hover {
  box-shadow: var(--shadow-md);
}

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

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

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

.reading-content h3 {
  font-size: 18px;
}

.reading-content h3 a {
  color: var(--color-blue);
}

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

.reading-meta {
  font-size: 13px;
  color: var(--color-text-muted);
}

.reading-content > p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.reading-content > a {
  font-size: 14px;
  font-weight: 500;
  margin-top: auto;
}

.analysis-framework {
  padding: 32px 0 8px;
}

.framework-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.framework-step {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-orange);
  line-height: 1;
}

.framework-step h3 {
  font-size: 16px;
  color: var(--color-blue);
}

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

/* ---------- 事件时间线（shijian） ---------- */
.timeline-content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.timeline-section {
  padding: 0;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 24px;
}

.timeline-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 32px;
  border-left: 2px solid var(--color-border);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -9px;
  top: 0;
  background-color: var(--color-accent);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid var(--color-surface);
  box-shadow: 0 0 0 1px var(--color-accent);
}

.timeline-marker time {
  position: absolute;
  top: -2px;
  left: 24px;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
}

.timeline-body {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-body h3 {
  font-size: 17px;
  color: var(--color-blue);
}

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

.timeline-figure {
  margin-top: 8px;
  overflow: hidden;
  border-radius: var(--radius-md);
}

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

.node-explanation {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-explanation p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
}

.related-reading {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.related-list li a {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
  display: inline-block;
  transition: color 0.2s ease;
}

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

/* ---------- FAQ（wenti） ---------- */
.faq-section {
  min-width: 0;
  padding: 0;
}

.content-media {
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

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

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

.content-media figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 8px 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

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

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-blue);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border-light);
  background-color: rgba(192, 57, 43, 0.02);
}

.faq-answer {
  padding: 16px 20px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ---------- 反馈入口 ---------- */
.feedback-entry {
  min-width: 0;
  padding: 0;
}

.feedback-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.feedback-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 4px;
}

.feedback-list li {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.feedback-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-orange);
  border-radius: 50%;
}

.feedback-list strong {
  color: var(--color-blue);
  font-weight: 600;
}

.feedback-box > p:last-child {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 4px;
}

.feedback-box > p:last-child a {
  font-weight: 500;
}

/* ---------- 404 页面 ---------- */
.error-inner {
  text-align: center;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

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

.error-inner h1 {
  font-size: 28px;
  color: var(--color-blue);
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.error-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.error-back:hover {
  background-color: var(--color-accent-dark);
  color: #fff;
}

.error-help {
  font-size: 14px;
  color: var(--color-text-muted);
  display: flex;
  gap: 16px;
}

/* ============================================================
   Pages 特定页面微调
   ============================================================ */

/* 首页 */
.site-home .site-main {
  padding-bottom: 0;
}

/* 内页 */
.site-inner .site-main {
  padding-bottom: 0;
}

/* ============================================================
   Responsive
   ============================================================ */

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

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

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

@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
  }

  .header-inner {
    height: 60px;
  }

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

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

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

  .site-nav {
    position: static;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 0;
    z-index: 99;
  }

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

  .nav-list li a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--color-border-light);
    border-radius: 0;
    font-size: 16px;
  }

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

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

  .footer-links {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  /* 面包屑 */
  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  /* 页面标题 */
  .page-header {
    padding-top: 20px;
  }

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

  .page-description {
    font-size: 15px;
  }

  /* 首页 hero */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 24px;
  }

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

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

  /* 首页专题卡片 */
  .topic-cards {
    grid-template-columns: 1fr;
  }

  /* 频道网格 */
  .channel-grid {
    grid-template-columns: 1fr;
  }

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

  /* 专题网格 */
  .topic-grid {
    grid-template-columns: 1fr;
  }

  /* 解读列表 */
  .reading-item {
    flex-direction: column;
    gap: 12px;
  }

  .reading-media {
    width: 100%;
  }

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

  /* 框架网格 */
  .framework-grid {
    grid-template-columns: 1fr;
  }

  /* 时间线 */
  .timeline-item {
    padding-left: 24px;
  }

  .timeline-marker time {
    position: static;
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
  }

  .timeline-body {
    padding: 14px 16px;
  }

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

  /* 侧栏布局 */
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 16px;
  }

  .sidebar {
    position: static;
    order: 2;
  }

  .layout-shell > :first-child {
    order: 1;
  }

  /* FAQ */
  .faq-item summary {
    font-size: 15px;
    padding: 14px 40px 14px 16px;
  }

  .faq-answer {
    padding: 14px 16px;
  }

  /* 404 */
  .error-code {
    font-size: 56px;
  }

  .error-inner h1 {
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 24px;
  }

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

  .hero-cta {
    width: 100%;
  }

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

  .pick-item {
    flex-direction: column;
    gap: 8px;
  }

  .pick-index {
    font-size: 20px;
  }

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

  .footer-col h3 {
    margin-bottom: 8px;
  }

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

  .news-item h3 {
    font-size: 16px;
  }

  .news-summary {
    font-size: 14px;
  }

  .channel-body {
    padding: 14px 16px 16px;
  }

  .topic-content {
    padding: 14px 16px 16px;
  }

  .reading-content h3 {
    font-size: 16px;
  }

  .timeline-body h3 {
    font-size: 16px;
  }

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

  .feedback-box {
    padding: 18px;
  }

  .feedback-list li {
    font-size: 13px;
  }

  .related-section p {
    flex-direction: column;
    gap: 8px;
  }

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

/* ---------- 滚动出现动画（渐进增强，不影响初始可见性） ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .news-item,
  .topic-card,
  .pick-item,
  .channel-card,
  .reading-item,
  .framework-step,
  .timeline-item,
  .faq-item {
    animation: fadeInUp 0.5s ease both;
  }

  .news-item:nth-child(2),
  .topic-card:nth-child(2),
  .pick-item:nth-child(2),
  .channel-card:nth-child(2),
  .reading-item:nth-child(2),
  .framework-step:nth-child(2),
  .timeline-item:nth-child(2),
  .faq-item:nth-child(2) {
    animation-delay: 0.08s;
  }

  .news-item:nth-child(3),
  .topic-card:nth-child(3),
  .pick-item:nth-child(3),
  .channel-card:nth-child(3),
  .reading-item:nth-child(3),
  .framework-step:nth-child(3),
  .timeline-item:nth-child(3),
  .faq-item:nth-child(3) {
    animation-delay: 0.16s;
  }

  .news-item:nth-child(4),
  .channel-card:nth-child(4),
  .reading-item:nth-child(4),
  .framework-step:nth-child(4),
  .timeline-item:nth-child(4),
  .faq-item:nth-child(4) {
    animation-delay: 0.24s;
  }

  .news-item:nth-child(5),
  .channel-card:nth-child(5),
  .reading-item:nth-child(5),
  .timeline-item:nth-child(5),
  .faq-item:nth-child(5) {
    animation-delay: 0.32s;
  }

  .channel-card:nth-child(6),
  .reading-item:nth-child(6) {
    animation-delay: 0.4s;
  }
}