/* =========================================================
   Base
   ========================================================= */
:root {
  --color-bg: #F5F0E8;
  --color-primary: #3E5C4B;
  --color-accent: #D9A441;
  --color-text: #2D2D2D;
  --color-white: #FFFFFF;
  --color-border: #E2DACB;
  --color-muted: #6B6B6B;
  --color-tag-bg: #EFE7D8;
  --shadow-card: 0 2px 8px rgba(45, 45, 45, 0.06);
  --shadow-hover: 0 6px 20px rgba(45, 45, 45, 0.1);
  --radius-card: 8px;
  --radius-tag: 20px;
  --container-width: 1200px;
  --font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: 0.25s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 2rem;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

h4 {
  font-size: 0.95rem;
  font-weight: 600;
}

p {
  margin-bottom: 0.8rem;
}

.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-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1;
}

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* 内页双栏布局：主内容在前，侧栏在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

/* longtail-renewal 的布局结构：main-content 在前，aside 在后 */
.main-content {
  min-width: 0;
}

.aside-sidebar {
  min-width: 0;
}

/* longtail-genre 的布局结构 */
.sidebar-right {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

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

.sidebar-right .sidebar {
  min-width: 0;
}

/* categories 页面的布局 */
.page-categories .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

/* guide 页面的布局 */
.page-guide .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

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

.sidebar-col {
  min-width: 0;
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

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

.brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
}

.brand-slogan {
  font-size: 0.75rem;
  color: var(--color-muted);
}

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

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  border-radius: var(--radius-tag);
  font-size: 0.92rem;
  color: var(--color-text);
}

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

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

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

.nav-toggle-line {
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  display: block;
  transition: transform var(--transition), opacity var(--transition);
}

/* =========================================================
   Breadcrumb
   ========================================================= */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-muted);
  padding: 20px 0 0;
}

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

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

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

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

/* =========================================================
   页面标题区
   ========================================================= */
.page-header {
  padding: 28px 0 24px;
}

.page-title {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.page-description {
  font-size: 1rem;
  color: var(--color-muted);
  max-width: 720px;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.9);
  margin-top: 60px;
}

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

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

.footer-site-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer-desc {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 8px;
  max-width: 480px;
}

.footer-links-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-col h4 {
  color: var(--color-white);
  margin-bottom: 12px;
  font-size: 0.95rem;
}

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

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.88rem;
}

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

.footer-bottom {
  padding-top: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
}

/* =========================================================
   首页 Hero
   ========================================================= */
.hero-section {
  background-color: var(--color-bg);
  padding: 56px 0 48px;
}

.hero-section .layout-shell {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 560px;
}

.hero-content h1 {
  font-size: 2.2rem;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

.action-link {
  display: inline-block;
  padding: 10px 22px;
  border-radius: var(--radius-tag);
  font-size: 0.92rem;
  font-weight: 500;
  background-color: var(--color-primary);
  color: var(--color-white);
  transition: background-color var(--transition), transform var(--transition);
}

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

.action-link:nth-child(2) {
  background-color: var(--color-accent);
}

.action-link:nth-child(3) {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.hero-media {
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

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

/* =========================================================
   首页分类导航带
   ========================================================= */
.category-nav-section {
  padding: 40px 0;
}

.category-nav-section h2 {
  margin-bottom: 20px;
}

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

.category-tag {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-tag-bg);
  border-radius: var(--radius-tag);
  font-size: 0.9rem;
  color: var(--color-primary);
  border: 1px solid transparent;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.category-tag:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* =========================================================
   首页最近更新
   ========================================================= */
.recent-updates-section {
  padding: 40px 0;
}

.recent-updates-section h2 {
  margin-bottom: 24px;
}

.update-group {
  margin-bottom: 28px;
}

.update-date {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.update-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.update-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}

.update-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

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

.update-info {
  padding: 14px;
}

.update-title {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 6px;
  color: var(--color-text);
}

.update-status {
  font-size: 0.8rem;
  color: var(--color-accent);
}

/* =========================================================
   首页人气榜单
   ========================================================= */
.ranking-section {
  padding: 40px 0;
}

.ranking-section h2 {
  margin-bottom: 24px;
}

.ranking-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.ranking-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 16px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ranking-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.ranking-num {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent);
}

.ranking-item img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 6px;
}

.ranking-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ranking-name {
  font-weight: 600;
  font-size: 0.92rem;
}

.ranking-reason {
  font-size: 0.82rem;
  color: var(--color-muted);
}

/* =========================================================
   首页指南入口
   ========================================================= */
.guide-entry-section {
  padding: 40px 0;
}

.guide-entry-section h2 {
  margin-bottom: 24px;
}

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

.guide-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guide-card h3 {
  font-size: 1.1rem;
}

.guide-card p {
  color: var(--color-muted);
  font-size: 0.92rem;
  flex: 1;
}

.guide-card a {
  align-self: flex-start;
  font-weight: 600;
  font-size: 0.9rem;
}

/* =========================================================
   首页长尾专题预告
   ========================================================= */
.longtail-preview-section {
  padding: 40px 0;
}

.longtail-preview-section h2 {
  margin-bottom: 24px;
}

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

.longtail-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.longtail-card h3 {
  font-size: 1.05rem;
}

.longtail-card p {
  color: var(--color-muted);
  font-size: 0.92rem;
  flex: 1;
}

.longtail-card a {
  align-self: flex-start;
  font-weight: 600;
  font-size: 0.9rem;
}

/* =========================================================
   首页 FAQ 入口
   ========================================================= */
.faq-entry-section {
  padding: 40px 0;
}

.faq-entry-section h2 {
  margin-bottom: 12px;
}

.faq-entry-section p {
  color: var(--color-muted);
}

.faq-entry-section p a {
  font-weight: 600;
}

/* =========================================================
   分类页
   ========================================================= */
.category-section {
  padding: 16px 0 32px;
}

.section-title {
  margin-bottom: 12px;
}

.section-desc {
  color: var(--color-muted);
  margin-bottom: 20px;
}

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

.category-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

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

.category-card h3 {
  padding: 14px 16px 4px;
  font-size: 1rem;
}

.category-card p {
  padding: 0 16px 8px;
  font-size: 0.88rem;
  color: var(--color-muted);
}

.category-card .category-tag {
  margin: 4px 16px 16px;
  display: inline-block;
  font-size: 0.8rem;
  padding: 4px 14px;
}

.category-examples {
  padding: 16px 0 32px;
}

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

.example-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.example-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.example-item p {
  font-size: 0.88rem;
  color: var(--color-muted);
}

.more-link {
  margin-top: 20px;
  display: flex;
  gap: 20px;
}

.more-link a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* 分类页相关链接（主栏底部） */
.related-links {
  padding: 16px 0 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.related-links-label {
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.related-links-item {
  font-size: 0.9rem;
  color: var(--color-text);
}

.related-links-item:hover {
  color: var(--color-primary);
}

/* 分类页侧栏 */
.sidebar-area {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.sidebar-card h2 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

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

.sidebar-links li a {
  font-size: 0.9rem;
  color: var(--color-text);
  display: block;
  padding: 4px 0;
}

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

.sidebar-note {
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* =========================================================
   Guide 页
   ========================================================= */
.content-section {
  padding: 16px 0 32px;
}

.content-section h2 {
  margin-bottom: 12px;
}

.section-lead {
  color: var(--color-muted);
  margin-bottom: 20px;
}

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

.step-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

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

.step-content h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--color-muted);
}

.media-figure {
  margin: 24px 0;
  border-radius: var(--radius-card);
  overflow: hidden;
}

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

.media-figure figcaption {
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--color-muted);
  background-color: var(--color-white);
}

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

.tip-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.tip-card h3 {
  font-size: 0.98rem;
  margin-bottom: 8px;
}

.tip-card p {
  font-size: 0.88rem;
  color: var(--color-muted);
}

.section-note {
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.section-note a {
  font-weight: 600;
}

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

.habit-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.habit-item h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.habit-item p {
  font-size: 0.9rem;
  color: var(--color-muted);
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list li a {
  font-size: 0.9rem;
  color: var(--color-text);
}

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

/* =========================================================
   Longtail 页（追更技巧 & 题材选择）
   ========================================================= */
.content-section ul {
  list-style: none;
  margin-bottom: 16px;
}

.content-section ul li {
  padding: 8px 0 8px 20px;
  position: relative;
  font-size: 0.92rem;
}

.content-section ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.problem-list li {
  padding: 8px 0 8px 20px;
  position: relative;
  font-size: 0.92rem;
}

.problem-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.problem-list strong {
  color: var(--color-primary);
}

.related-topics {
  padding: 16px 0;
}

.related-topics p {
  color: var(--color-muted);
}

.related-topics p a {
  font-weight: 600;
  margin-right: 16px;
}

.sidebar-title {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.sidebar-inner {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.sidebar-note {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* longtail-genre 文章图片 */
.media-figure {
  margin: 20px 0;
}

.media-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.related-pages {
  padding: 16px 0;
}

.related-pages p {
  color: var(--color-muted);
}

.related-pages p a {
  font-weight: 600;
  margin-right: 16px;
}

/* =========================================================
   FAQ 页
   ========================================================= */
.faq-section {
  padding: 16px 0 32px;
}

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

.content-media {
  border-radius: var(--radius-card);
  overflow: hidden;
  margin-bottom: 20px;
}

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

.content-media figcaption {
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--color-muted);
  background-color: var(--color-white);
}

.content-media-inline {
  max-width: 720px;
}

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

.faq-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--color-primary);
  transition: transform var(--transition);
}

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

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
}

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

.faq-content p {
  font-size: 0.92rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* =========================================================
   404 页
   ========================================================= */
.error-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  text-align: center;
}

.error-panel {
  max-width: 560px;
  margin-bottom: 48px;
}

.error-code {
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-muted);
  margin-bottom: 24px;
}

.error-home-btn {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-tag);
  font-weight: 600;
}

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

.error-suggest h2 {
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.suggest-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.suggest-links a {
  padding: 8px 20px;
  background-color: var(--color-white);
  border-radius: var(--radius-tag);
  font-size: 0.9rem;
  color: var(--color-primary);
  box-shadow: var(--shadow-card);
}

.suggest-links a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1024px) {
  .page-layout,
  .sidebar-right,
  .page-categories .page-layout,
  .page-guide .page-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .sidebar-area,
  .sidebar-col,
  .aside-sidebar,
  .sidebar {
    order: 2;
    margin-top: 8px;
  }

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

  .ranking-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-section .layout-shell {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-media img {
    height: 260px;
  }
}

@media (max-width: 768px) {
  .header-shell {
    height: 60px;
  }

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 16px rgba(45, 45, 45, 0.1);
  }

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

  .nav-list li a {
    padding: 12px 16px;
    font-size: 1rem;
  }

  .site-nav {
    position: relative;
  }

  .update-list {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

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

  .guide-card-grid,
  .longtail-card-grid {
    grid-template-columns: 1fr;
  }

  .category-grid,
  .example-list,
  .tips-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-section {
    padding: 32px 0;
  }

  .hero-content h1 {
    font-size: 1.7rem;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .step-item {
    flex-direction: column;
    gap: 12px;
  }

  .step-number {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .layout-shell,
  .header-shell,
  .footer-shell {
    padding-left: 16px;
    padding-right: 16px;
  }

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

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

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

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

  .hero-media img {
    height: 200px;
  }

  .category-tag-list {
    gap: 8px;
  }

  .category-tag {
    padding: 6px 14px;
    font-size: 0.85rem;
  }

  .error-code {
    font-size: 3rem;
  }

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