/* ============================================================
   base — 基础变量、重置与全站骨架
   ============================================================ */
:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-gray-900: #1a1a1a;
  --color-gray-800: #333333;
  --color-gray-600: #666666;
  --color-gray-400: #999999;
  --color-gray-200: #e0e0e0;
  --color-gray-100: #f5f5f5;
  --color-gray-50: #fafafa;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --header-height: 72px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-fast: 0.2s ease;
  --transition-slow: 0.35s ease;
}

*,
*::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-gray-800);
  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-black);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-gray-600);
}

ul,
ol {
  list-style: none;
}

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

time {
  color: var(--color-gray-400);
  font-size: 0.875rem;
}

/* ============================================================
   layout — 全站容器、页头、页脚、面包屑
   ============================================================ */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

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

.brand-slogan {
  font-size: 0.75rem;
  color: var(--color-gray-600);
  margin-top: 2px;
}

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

.site-nav .nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.site-nav .nav-list li a:hover {
  color: var(--color-black);
  background-color: var(--color-gray-100);
}

.site-nav .nav-list li a.is-current {
  color: var(--color-black);
  background-color: var(--color-gray-100);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  justify-content: center;
  align-items: center;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-black);
  border-radius: 1px;
}

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

.site-footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-400);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 48px;
}

.footer-brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 320px;
}

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

.footer-group h3 {
  font-size: 0.875rem;
  color: var(--color-white);
  margin-bottom: 12px;
  font-weight: 600;
}

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

.footer-group ul li a {
  font-size: 0.875rem;
  color: var(--color-gray-400);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 24px;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-gray-600);
}

/* 面包屑 — 全站内页统一 */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 24px 0;
  font-size: 0.875rem;
  color: var(--color-gray-600);
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb a {
  color: var(--color-gray-600);
}

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

.breadcrumb-sep {
  color: var(--color-gray-400);
}

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

/* 内页标题区 — 全站统一 */
.inner-main {
  width: 100%;
}

.inner-main .page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 24px;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 8px;
  line-height: 1.3;
}

.page-description {
  font-size: 1rem;
  color: var(--color-gray-600);
  max-width: 720px;
  line-height: 1.7;
}

/* ============================================================
   components — 首页模块组件
   ============================================================ */
/* Hero 区 */
.hero-section {
  background-color: var(--color-gray-50);
  border-bottom: 1px solid var(--color-gray-200);
}

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 72px 24px;
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--color-black);
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 480px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  min-height: 44px;
  transition: background-color var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast);
}

.btn-dark {
  background-color: var(--color-black);
  color: var(--color-white);
  border: 1px solid var(--color-black);
}

.btn-dark:hover {
  background-color: var(--color-gray-800);
  color: var(--color-white);
}

.btn-light {
  background-color: var(--color-white);
  color: var(--color-black);
  border: 1px solid var(--color-gray-200);
}

.btn-light:hover {
  border-color: var(--color-black);
  color: var(--color-black);
  background-color: var(--color-gray-50);
}

.hero-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-gray-200);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.hero-media figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background-color: rgba(0, 0, 0, 0.65);
  color: var(--color-white);
  font-size: 0.8125rem;
  line-height: 1.4;
}

/* 频道导航 */
.channel-nav-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px 0;
}

.channel-nav-section h2,
.latest-list-section h2,
.topic-cards-section h2,
.editor-picks-section h2,
.source-info-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  margin-bottom: 28px;
  max-width: 640px;
  line-height: 1.6;
}

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

.channel-tags li a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 20px;
  background-color: var(--color-gray-100);
  border: 1px solid var(--color-gray-200);
  border-radius: 999px;
  font-size: 0.9375rem;
  color: var(--color-gray-800);
  font-weight: 500;
  transition: background-color var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast);
}

.channel-tags li a:hover {
  background-color: var(--color-black);
  border-color: var(--color-black);
  color: var(--color-white);
}

/* 最新资讯列表 */
.latest-list-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px 0;
}

.latest-list {
  border-top: 1px solid var(--color-gray-200);
}

.latest-item {
  border-bottom: 1px solid var(--color-gray-200);
}

.latest-card {
  padding: 24px 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
}

.latest-card h3 {
  grid-column: 1 / -1;
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
}

.latest-card h3 a {
  color: var(--color-black);
}

.latest-card h3 a:hover {
  color: var(--color-gray-600);
}

.latest-card p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  max-width: 720px;
}

.latest-card time {
  grid-column: 1 / -1;
  font-size: 0.8125rem;
}

/* 专题推荐卡片 */
.topic-cards-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px 0;
}

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

.topic-card {
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.topic-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.topic-card-media {
  overflow: hidden;
  background-color: var(--color-gray-200);
}

.topic-card-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.topic-card h3 {
  padding: 20px 20px 0;
  font-size: 1.25rem;
  font-weight: 700;
}

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

.topic-card h3 a:hover {
  color: var(--color-gray-600);
}

.topic-card p {
  padding: 8px 20px 0;
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  flex: 1;
}

.text-link {
  display: inline-flex;
  align-items: center;
  padding: 16px 20px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-black);
  min-height: 44px;
}

.text-link:hover {
  color: var(--color-gray-600);
}

/* 编辑推荐 */
.editor-picks-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px 0;
}

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

.pick-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow var(--transition-fast);
}

.pick-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.pick-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pick-card h3 a {
  color: var(--color-black);
}

.pick-card h3 a:hover {
  color: var(--color-gray-600);
}

.pick-card p {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

/* 信息来源 */
.source-info-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px 0;
}

.source-info-section p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 760px;
}

/* ============================================================
   pages — 频道分类页
   ============================================================ */
.channel-grid-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 24px 0;
}

.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 24px;
}

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

.channel-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-fast);
}

.channel-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.channel-card-media {
  overflow: hidden;
  background-color: var(--color-gray-200);
}

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

.channel-card-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.channel-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.channel-card-desc {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.channel-card-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-black);
}

.channel-card-link:hover {
  color: var(--color-gray-600);
}

.channel-guide-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 0;
}

.channel-guide-content {
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.channel-guide-content p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: 12px;
}

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

/* ============================================================
   pages — 内容专题页
   ============================================================ */
.topic-list {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 24px 0;
}

.topic-list > h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-note {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  margin-bottom: 32px;
}

.topic-year-group {
  margin-bottom: 40px;
}

.topic-year {
  font-size: 1.125rem;
  font-weight: 700;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-black);
  margin-bottom: 20px;
  display: inline-block;
}

.topic-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.topic-item {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-white);
  transition: box-shadow var(--transition-fast);
}

.topic-item:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.topic-item .topic-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  border: none;
  border-radius: 0;
  background-color: transparent;
  min-height: 100%;
}

.topic-item .topic-card:hover {
  transform: none;
  box-shadow: none;
}

.topic-media {
  background-color: var(--color-gray-200);
  overflow: hidden;
}

.topic-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.topic-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.topic-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

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

.topic-content h3 a:hover {
  color: var(--color-gray-600);
}

.topic-content p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

.topic-meta {
  margin-top: 12px;
  font-size: 0.8125rem;
  color: var(--color-gray-400);
}

.topic-summary-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 0;
}

.topic-summary-section > h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.topic-summary-section > p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  margin-bottom: 24px;
}

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

.summary-item {
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.summary-item h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.summary-item p {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

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

.related-reads h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.related-reads > p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  margin-bottom: 20px;
}

.related-links {
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.related-links ul li {
  margin-bottom: 12px;
}

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

.related-links ul li a {
  font-size: 0.9375rem;
  color: var(--color-gray-800);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  line-height: 1.4;
}

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

/* ============================================================
   pages — 实用指南页
   ============================================================ */
.page-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.guide-article {
  max-width: 820px;
}

.guide-section {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-gray-200);
}

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

.guide-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.guide-section > p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: 24px;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.step-num {
  width: 48px;
  height: 48px;
  background-color: var(--color-black);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 700;
}

.step-content h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

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

.verify-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.verify-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.verify-card p {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

.guide-figure {
  background-color: var(--color-gray-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 8px;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 16px;
  font-size: 0.8125rem;
  color: var(--color-gray-600);
  background-color: var(--color-gray-50);
}

/* 指南页相关链接 */
.guide-article .related-links {
  margin-top: 32px;
}

/* ============================================================
   pages — 深度解读页
   ============================================================ */
.insight-article {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

.analysis-framework {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.analysis-framework h2,
.case-analysis h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.analysis-framework > p,
.case-analysis > p {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: 16px;
}

.framework-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0;
}

.framework-list li {
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.framework-list strong {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-black);
  flex-shrink: 0;
  min-width: 88px;
}

.framework-list span {
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

.case-analysis {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.case-figure {
  background-color: var(--color-gray-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 20px;
}

.case-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.case-figure figcaption {
  padding: 12px 16px;
  font-size: 0.8125rem;
  color: var(--color-gray-600);
  background-color: var(--color-gray-50);
}

.insight-article .related-links {
  margin-top: 32px;
}

/* ============================================================
   pages — 404 页面
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.error-block {
  text-align: center;
  max-width: 480px;
}

.error-block h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.1;
}

.error-block p {
  font-size: 1rem;
  color: var(--color-gray-600);
  margin-bottom: 32px;
  line-height: 1.7;
}

.error-home-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 32px;
  background-color: var(--color-black);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: background-color var(--transition-fast);
}

.error-home-link:hover {
  background-color: var(--color-gray-800);
  color: var(--color-white);
}

/* ============================================================
   responsive — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .hero-section {
    gap: 32px;
    padding: 56px 24px;
  }

  .hero-content h1 {
    font-size: 2.125rem;
  }

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

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

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

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

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
    display: block;
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 0;
  }

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

  .site-nav .nav-list li a {
    padding: 12px 8px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
  }

  .hero-section {
    grid-template-columns: 1fr;
    padding: 40px 16px;
    gap: 24px;
  }

  .hero-content h1 {
    font-size: 1.875rem;
  }

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

  .channel-nav-section,
  .latest-list-section,
  .topic-cards-section,
  .editor-picks-section,
  .source-info-section {
    padding: 48px 16px 0;
  }

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

  .editor-picks-list {
    grid-template-columns: 1fr;
  }

  .latest-card {
    grid-template-columns: 1fr;
  }

  .breadcrumb {
    padding: 20px 16px 0;
  }

  .inner-main .page-header {
    padding: 32px 16px 20px;
  }

  .page-title {
    font-size: 1.625rem;
  }

  .channel-grid-section,
  .channel-guide-section,
  .topic-list,
  .topic-summary-section,
  .related-reads {
    padding-left: 16px;
    padding-right: 16px;
  }

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

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

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

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

  .page-layout {
    padding: 0 16px;
  }

  .step-item {
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 16px;
  }

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

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

  .insight-article {
    padding: 0 16px 40px;
  }

  .framework-list li {
    flex-direction: column;
    gap: 4px;
  }

  .framework-list strong {
    min-width: 0;
  }

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

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

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

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .brand-name {
    font-size: 1.25rem;
  }

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

  .hero-content h1 {
    font-size: 1.625rem;
  }

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

  .btn {
    width: 100%;
  }

  .channel-tags {
    gap: 8px;
  }

  .channel-tags li a {
    padding: 8px 16px;
    font-size: 0.875rem;
  }

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

  .footer-group h3 {
    font-size: 0.8125rem;
  }

  .footer-group ul li a {
    font-size: 0.8125rem;
  }

  .error-block h1 {
    font-size: 2.5rem;
  }
}