/* ==========================================================================
   吃瓜网黑料 — 全站样式表
   单色品牌风：黑白主体 + 深红识别色
   ========================================================================== */

/* --------------------------------------------------------------------------
   Base — 基础变量、重置与排版
   -------------------------------------------------------------------------- */
:root {
  --color-ink: #1a1a1a;
  --color-white: #ffffff;
  --color-accent: #8b0000;
  --color-soft: #f5f5f5;
  --color-gray: #333333;
  --color-line: #e0e0e0;
  --color-muted: #6b6b6b;

  --font-body: Arial, Helvetica, sans-serif;

  --container-width: 1200px;
  --container-pad: 24px;
  --radius-card: 8px;
  --radius-small: 4px;

  --space-section: 56px;
  --space-block: 32px;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-white);
  line-height: 1.6;
  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 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

/* --------------------------------------------------------------------------
   Layout — 全站公共骨架
   -------------------------------------------------------------------------- */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

/* 页头 */
.site-header {
  background: var(--color-ink);
  border-bottom: 3px solid var(--color-accent);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.5px;
}

.brand:hover .brand-name {
  color: var(--color-white);
}

.brand-tagline {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  display: none;
}

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

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  border-radius: var(--radius-small);
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.08);
}

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

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

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

/* 页脚 */
.site-footer {
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.75);
  margin-top: 0;
}

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

.footer-slogan {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
}

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

.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

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

.footer-col li a {
  color: rgba(255, 255, 255, 0.65);
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 16px var(--container-pad);
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  margin: 0;
}

/* 内页公共骨架 */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-pad) 56px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

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

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

.breadcrumb-sep {
  color: #b0b0b0;
}

.breadcrumb-current {
  color: var(--color-ink);
  font-weight: 600;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  color: var(--color-ink);
  margin-bottom: 12px;
}

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

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

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

/* --------------------------------------------------------------------------
   Components — 通用组件
   -------------------------------------------------------------------------- */

/* 来源说明块 */
.source-note {
  background: var(--color-soft);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 28px 32px;
  margin-top: 48px;
}

.source-note .section-title {
  margin-bottom: 16px;
}

.source-note p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.75;
  margin-bottom: 8px;
}

.source-note a {
  color: var(--color-accent);
  font-weight: 600;
}

.source-note a:hover {
  text-decoration: underline;
}

/* 专题卡片（首页与专题页共用） */
.topic-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.topic-card {
  display: block;
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

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

.topic-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.topic-card-body {
  padding: 16px 18px 20px;
}

.topic-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-ink);
}

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

.topic-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 12px;
}

.topic-link {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
}

/* 编辑推荐（首页与专题页） */
.pick-list,
.recommend-list {
  display: grid;
  gap: 16px;
}

.pick-item,
.recommend-item {
  background: var(--color-soft);
  border-left: 3px solid var(--color-accent);
  padding: 16px 20px;
  border-radius: 0 var(--radius-small) var(--radius-small) 0;
}

.pick-title,
.recommend-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

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

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

.pick-reason,
.recommend-item p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

/* 文本链接 */
.text-link {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 14px;
}

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

/* --------------------------------------------------------------------------
   Pages — 首页
   -------------------------------------------------------------------------- */

/* 首屏焦点报道 */
.hero {
  background: var(--color-ink);
  color: var(--color-white);
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 56px var(--container-pad);
  max-width: var(--container-width);
  margin: 0 auto;
}

.hero-title {
  font-size: 34px;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--color-white);
}

.hero-description {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 24px;
  max-width: 480px;
}

.hero-cta {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 700;
  padding: 10px 24px;
  border-radius: var(--radius-small);
  transition: background 0.2s ease;
}

.hero-cta:hover {
  background: #a01010;
  color: var(--color-white);
}

.hero-meta {
  display: flex;
  gap: 20px;
  margin-top: 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

.hero-figure {
  margin: 0;
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-card);
}

/* 频道导航带 */
.channels-nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 0;
}

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

.channel-tag {
  display: inline-block;
  padding: 8px 20px;
  background: var(--color-soft);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-gray);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

/* 最新资讯列表 */
.latest-news {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 0;
}

.news-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.news-item {
  padding: 20px 4px;
  border-bottom: 1px solid var(--color-line);
  transition: background 0.2s ease;
}

.news-item:hover {
  background: var(--color-soft);
}

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

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

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

.news-summary {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 8px;
  max-width: 800px;
}

.news-date {
  font-size: 13px;
  color: #999;
}

/* 焦点报道区 */
.focus-report {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 0;
}

.focus-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.focus-item {
  background: var(--color-soft);
  border-radius: var(--radius-card);
  padding: 24px;
  border-top: 3px solid var(--color-accent);
}

.focus-title {
  font-size: 18px;
  margin-bottom: 10px;
}

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

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

.focus-summary {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.65;
  margin-bottom: 14px;
}

.focus-link {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
}

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

/* 专题推荐区 */
.topics-recommend {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 0;
}

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

.topic-card-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.topic-card-text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
}

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

/* 来源说明 */
.home-main .source-note {
  max-width: var(--container-width);
  margin: 48px auto 0;
}

/* --------------------------------------------------------------------------
   Pages — 频道分类页
   -------------------------------------------------------------------------- */

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

.channel-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-line);
}

.channel-item:first-of-type {
  border-top: 1px solid var(--color-line);
}

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

.channel-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.channel-item:hover .channel-media img {
  transform: scale(1.03);
}

.channel-name {
  font-size: 20px;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 640px;
}

.channel-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  padding: 6px 0;
}

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

/* 频道说明 */
.channel-note {
  background: var(--color-soft);
  border-radius: var(--radius-card);
  padding: 28px 32px;
  margin-top: 8px;
}

.note-content p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.75;
  margin-bottom: 10px;
}

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

/* --------------------------------------------------------------------------
   Pages — 内容专题页
   -------------------------------------------------------------------------- */

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

.topic-grid .topic-cards {
  grid-template-columns: repeat(4, 1fr);
}

/* 专题详情入口 */
.topic-detail-entry {
  margin-bottom: 48px;
}

.entry-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.entry-links a {
  display: block;
  padding: 18px 22px;
  background: var(--color-soft);
  border-radius: var(--radius-card);
  border-left: 3px solid var(--color-accent);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  transition: background 0.2s ease;
}

.entry-links a:hover {
  background: #ececec;
  color: var(--color-accent);
}

.entry-note {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
}

/* 编辑推荐 */
.editor-recommend {
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   Pages — 实用指南页
   -------------------------------------------------------------------------- */

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

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

.guide-item:first-of-type {
  border-top: 1px solid var(--color-line);
}

.guide-item-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.guide-item-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

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

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

.guide-item-content p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.65;
  margin-bottom: 10px;
}

.guide-item-content a {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
}

.guide-item-content a:hover {
  text-decoration: underline;
}

/* 方法正文 */
.guide-content {
  max-width: 860px;
}

.guide-content h2 {
  font-size: 24px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.method-block {
  margin-bottom: 36px;
  padding: 24px 28px;
  background: var(--color-soft);
  border-radius: var(--radius-card);
  border-left: 3px solid var(--color-accent);
}

.method-block h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.method-block p {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.75;
  margin-bottom: 10px;
}

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

/* --------------------------------------------------------------------------
   Pages — 深度解读页
   -------------------------------------------------------------------------- */

.insight-list-section {
  margin-bottom: 48px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 760px;
}

.insight-list {
  display: grid;
  gap: 24px;
}

.insight-item {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

.insight-item:first-of-type {
  border-top: 1px solid var(--color-line);
}

.insight-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.insight-body h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

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

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

.insight-excerpt {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 10px;
}

.insight-meta {
  font-size: 13px;
  color: #999;
  margin-bottom: 10px;
}

/* 分析框架 */
.analysis-framework {
  margin-bottom: 48px;
  padding: 32px;
  background: var(--color-soft);
  border-radius: var(--radius-card);
}

.analysis-framework > h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.analysis-framework > p {
  font-size: 15px;
  color: var(--color-gray);
  margin-bottom: 24px;
}

.framework-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: start;
}

.framework-step:last-of-type {
  border-bottom: 0;
}

.framework-step h3 {
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--color-ink);
}

.framework-step h3::before {
  content: attr(data-step);
  display: block;
  width: 40px;
  height: 40px;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  line-height: 40px;
  grid-column: 1;
  grid-row: 1;
}

.framework-step h3 {
  grid-column: 2;
}

.framework-step p {
  grid-column: 2;
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
  margin: 0;
}

.framework-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.framework-note a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 相关阅读 */
.related-reading {
  margin-bottom: 32px;
}

.related-reading h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.related-reading p {
  font-size: 15px;
  color: var(--color-gray);
  margin-bottom: 10px;
}

.related-reading a {
  display: inline-block;
  margin-right: 20px;
  margin-bottom: 8px;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 15px;
}

.related-reading a:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Pages — 404 页
   -------------------------------------------------------------------------- */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px var(--container-pad);
  flex: 1 0 auto;
}

.error-panel {
  max-width: 560px;
  text-align: center;
  background: var(--color-soft);
  border-radius: var(--radius-card);
  padding: 48px 40px;
  border-top: 4px solid var(--color-accent);
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-code p {
  margin: 0;
}

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.error-link {
  display: inline-block;
  padding: 9px 22px;
  background: var(--color-ink);
  color: var(--color-white);
  border-radius: var(--radius-small);
  font-size: 14px;
  font-weight: 600;
  transition: background 0.2s ease;
}

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

.error-help {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Responsive — 响应式规则
   -------------------------------------------------------------------------- */

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

  .channel-item {
    grid-template-columns: 220px 1fr;
  }

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

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

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

/* 手机端 */
@media (max-width: 768px) {
  :root {
    --space-section: 40px;
    --container-pad: 16px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  /* 页头导航 */
  .header-inner {
    flex-wrap: wrap;
    min-height: 56px;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 8px 0 16px;
    gap: 2px;
  }

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

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

  /* 首页首屏 */
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 36px var(--container-pad);
  }

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

  .hero-meta {
    flex-wrap: wrap;
    gap: 8px 16px;
  }

  /* 首页焦点 */
  .focus-grid {
    grid-template-columns: 1fr;
  }

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

  /* 专题页 */
  .topic-cards,
  .topic-grid .topic-cards {
    grid-template-columns: 1fr;
  }

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

  .channel-media img {
    aspect-ratio: 16 / 9;
  }

  /* 指南页 */
  .guide-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .guide-item-img {
    aspect-ratio: 16 / 9;
  }

  /* 解读页 */
  .insight-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .insight-media img {
    aspect-ratio: 16 / 9;
  }

  .framework-step {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .framework-step h3::before {
    grid-column: 1;
    grid-row: 1;
    margin-bottom: 4px;
  }

  .framework-step h3 {
    grid-column: 1;
    grid-row: 2;
  }

  .framework-step p {
    grid-column: 1;
    grid-row: 3;
  }

  /* 专题详情入口 */
  .entry-links {
    grid-template-columns: 1fr;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
  }

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

  /* 来源说明 */
  .source-note {
    padding: 20px;
  }

  /* 404 */
  .error-panel {
    padding: 36px 24px;
  }

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

/* 小屏手机 */
@media (max-width: 480px) {
  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .footer-title {
    font-size: 14px;
  }

  .footer-col li a {
    font-size: 13px;
  }

  .brand-tagline {
    display: none;
  }

  .channel-tags {
    gap: 8px;
  }

  .channel-tag {
    padding: 7px 14px;
    font-size: 13px;
  }

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

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

  .error-link {
    text-align: center;
  }
}