/* ==========================================================================
   base — 全局基础样式、变量、重置
   ========================================================================== */

:root {
  --color-ink: #1a1a1a;
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-accent: #c0392b;
  --color-accent-dark: #a93226;
  --color-navy: #2c3e50;
  --color-navy-dark: #1f2c38;
  --color-muted: #5a5a5a;
  --color-border: #d9d9d9;
  --color-focus: #2c3e50;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;

  --container-width: 1200px;
  --header-height: 64px;
  --radius: 6px;
  --radius-sm: 4px;

  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 48px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

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

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

a {
  color: var(--color-navy);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(44, 62, 80, 0.35);
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

a:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

ul,
ol {
  list-style-position: inside;
}

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

h1 {
  font-size: 32px;
  margin-bottom: var(--space-sm);
}

h2 {
  font-size: 24px;
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 18px;
  margin-bottom: var(--space-xs);
}

h4 {
  font-size: 16px;
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-sm);
}

figure {
  margin: 0;
}

/* ==========================================================================
   layout — 全站骨架、页头、页脚、面包屑、页面标题区
   ========================================================================== */

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

.site-header {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-navy);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-link {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-link:hover {
  text-decoration: none;
}

.brand-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.05em;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
}

.nav-list a:hover {
  color: var(--color-accent);
  background-color: rgba(192, 57, 43, 0.06);
  text-decoration: none;
}

.nav-list a.is-current {
  color: var(--color-surface);
  background-color: var(--color-navy);
  border-color: var(--color-navy);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 2px solid var(--color-navy);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-navy);
}

.nav-toggle:hover {
  background-color: rgba(44, 62, 80, 0.08);
}

/* 站点主内容区 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md) var(--space-xl);
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md) var(--space-xl);
}

/* 面包屑 */
.breadcrumb {
  padding: var(--space-md) 0 var(--space-sm);
  font-size: 14px;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb a {
  color: var(--color-navy);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

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

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

/* 页面标题区 */
.page-header {
  border-bottom: 2px solid var(--color-navy);
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-lg);
}

.page-title {
  font-size: 30px;
  font-weight: 800;
  margin-bottom: var(--space-xs);
}

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

/* 页脚 */
.site-footer {
  background-color: var(--color-navy);
  color: rgba(255, 255, 255, 0.85);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md) var(--space-lg);
}

.footer-brand {
  margin-bottom: var(--space-lg);
}

.footer-brand p {
  margin-bottom: 0;
  font-size: 14px;
  max-width: 360px;
}

.footer-brand strong {
  display: block;
  font-size: 20px;
  color: var(--color-surface);
  margin-bottom: 4px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-col h4 {
  font-size: 15px;
  color: var(--color-surface);
  margin-bottom: var(--space-sm);
}

.footer-col ul {
  list-style: none;
}

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

.footer-col a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--color-surface);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: var(--space-md);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0;
}

/* ==========================================================================
   components — 通用可复用模块
   ========================================================================== */

/* 区块标题通用下划线强调 */
h2[id] {
  position: relative;
}

/* 卡片通用样式 */
.category-card,
.guide-card,
.related-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

/* 图片容器统一约束 */
.category-media,
.rank-media,
.hero-media,
.preview-item > img,
.update-item img,
.guide-figure,
.content-figure,
.feedback-hero-image {
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg);
}

.category-media img,
.rank-media img,
.hero-media img,
.preview-item > img,
.update-item img,
.guide-figure img,
.content-figure img,
.feedback-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   pages — 首页
   ========================================================================== */

.home-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-xl) 0 var(--space-lg);
}

.hero-media {
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

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

.hero-content h1 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.hero-intro {
  font-size: 16px;
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

.service-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.service-list li {
  margin: 0;
}

.service-list a {
  display: block;
  padding: 12px 16px;
  background-color: var(--color-surface);
  border: 2px solid var(--color-navy);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  color: var(--color-navy);
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.service-list a:hover {
  background-color: var(--color-navy);
  color: var(--color-surface);
  text-decoration: none;
}

/* 题材分类导航带 */
.topic-strip {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.topic-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.topic-tags a {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-surface);
  border: 2px solid var(--color-navy);
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-navy);
  text-decoration: none;
}

.topic-tags a:hover {
  background-color: var(--color-navy);
  color: var(--color-surface);
  text-decoration: none;
}

/* 最近更新 */
.recent-updates {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.update-group {
  margin-bottom: var(--space-lg);
}

.update-date {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.update-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.update-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.update-item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.update-info {
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.update-info h4 {
  font-size: 15px;
  margin-bottom: 0;
}

.update-status {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.update-info a {
  font-size: 14px;
  font-weight: 600;
  margin-top: auto;
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* 人气榜单预览 */
.popular-preview {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.preview-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.preview-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.preview-item > img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.preview-content {
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.preview-content h3 {
  font-size: 16px;
  margin-bottom: 0;
}

.reason {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
  line-height: 1.5;
}

.more-link {
  text-align: right;
  margin-bottom: 0;
}

.more-link a {
  font-weight: 600;
  color: var(--color-accent);
}

/* 阅读指南入口 */
.guide-entry {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.guide-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.guide-card {
  padding: var(--space-md);
}

.guide-card h3 {
  margin-bottom: var(--space-xs);
}

.guide-card h3 a {
  text-decoration: underline;
  text-underline-offset: 3px;
  color: var(--color-navy);
}

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

.guide-card p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* 版权与反馈说明 */
.copyright-note {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  max-width: 780px;
}

.copyright-note p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 0;
}

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

/* ==========================================================================
   pages — 题材分类 categories.html
   ========================================================================== */

.category-grid-section {
  margin-bottom: var(--space-xl);
}

.section-desc {
  color: var(--color-muted);
  margin-bottom: var(--space-lg);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.category-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.category-media {
  border-radius: 0;
}

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

.category-body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.category-body h3 {
  font-size: 18px;
  margin-bottom: 0;
}

.category-body p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
  flex: 1;
}

.category-body a {
  font-weight: 600;
  font-size: 14px;
  color: var(--color-accent);
  align-self: flex-start;
  margin-top: var(--space-xs);
}

.category-note-section {
  padding: var(--space-lg);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.note-content p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

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

/* ==========================================================================
   pages — 阅读指南 guide.html
   ========================================================================== */

.guide-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-lg);
  align-items: start;
}

.guide-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.guide-section h2 {
  font-size: 22px;
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.guide-section > p {
  color: var(--color-muted);
}

.step-list {
  list-style: none;
  counter-reset: step-counter;
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.step-list li {
  counter-increment: step-counter;
  position: relative;
  padding-left: 44px;
}

.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  background-color: var(--color-navy);
  color: var(--color-surface);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
}

.step-list h3 {
  font-size: 17px;
  margin-bottom: 4px;
}

.step-list p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.guide-figure {
  margin-top: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.guide-figure figcaption {
  padding: var(--space-xs) var(--space-sm);
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-bg);
}

.guide-related {
  display: grid;
  gap: var(--space-md);
  position: sticky;
  top: calc(var(--header-height) + var(--space-md));
}

.related-card {
  padding: var(--space-md);
}

.related-card h3 {
  font-size: 16px;
  margin-bottom: var(--space-xs);
}

.related-card p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.related-card a {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 6px;
}

/* ==========================================================================
   pages — 人气榜单 popular.html
   ========================================================================== */

.rank-section {
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: 22px;
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-md);
}

.rank-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-sm);
  margin-bottom: var(--space-sm);
  align-items: start;
}

.rank-media {
  border-radius: var(--radius-sm);
}

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

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

.rank-title {
  font-size: 18px;
  margin-bottom: 0;
}

.rank-reason {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.rank-reason strong {
  color: var(--color-ink);
}

.rank-meta {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.reason-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.section-intro {
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

.reason-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.reason-list li {
  padding: var(--space-sm);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--color-muted);
}

.reason-list strong {
  display: block;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.reason-section > p:last-child {
  margin-bottom: 0;
}

.reason-section > p a {
  font-weight: 600;
  margin-right: var(--space-md);
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.related-links-label {
  font-weight: 700;
  font-size: 15px;
}

.related-links-item {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  text-decoration: none;
}

.related-links-item:hover {
  border-color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ==========================================================================
   pages — 追更技巧 update-tips.html
   ========================================================================== */

.content-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.content-section h2 {
  font-size: 22px;
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.content-section h3 {
  font-size: 17px;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.content-section p {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 720px;
}

.content-figure {
  margin-top: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.content-figure figcaption {
  padding: var(--space-xs) var(--space-sm);
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-bg);
}

.related-links ul {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs);
}

.related-links li {
  margin: 0;
}

.related-links a {
  font-weight: 600;
  color: var(--color-accent);
  font-size: 15px;
}

/* ==========================================================================
   pages — 问题反馈 feedback.html
   ========================================================================== */

.feedback-hero-image {
  margin-bottom: var(--space-lg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.feedback-hero-image img {
  aspect-ratio: 21 / 7;
  width: 100%;
  object-fit: cover;
}

.feedback-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-lg);
  align-items: start;
}

.feedback-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.feedback-section h2 {
  font-size: 22px;
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.feedback-section > p {
  color: var(--color-muted);
}

.feedback-type-list {
  list-style: none;
  display: grid;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.feedback-type-list li {
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
}

.feedback-type-list h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.feedback-type-list p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.feedback-related {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  position: sticky;
  top: calc(var(--header-height) + var(--space-md));
}

.feedback-related h2 {
  font-size: 18px;
  margin-bottom: var(--space-sm);
}

.feedback-related p {
  font-size: 14px;
  color: var(--color-muted);
}

.feedback-related ul {
  list-style: none;
}

.feedback-related li {
  margin-bottom: 6px;
}

.feedback-related a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* ==========================================================================
   pages — 404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: var(--space-xl) var(--space-md);
}

.error-section {
  text-align: center;
  max-width: 520px;
}

.error-code {
  font-size: 72px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.error-section h1 {
  font-size: 24px;
  margin-bottom: var(--space-sm);
}

.error-section p {
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

.error-link {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-navy);
  color: var(--color-surface);
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 2px solid var(--color-navy);
}

.error-link:hover {
  background-color: var(--color-surface);
  color: var(--color-navy);
  text-decoration: none;
}

/* ==========================================================================
   responsive — 响应式断点
   ========================================================================== */

@media (max-width: 992px) {
  .category-grid {
    grid-template-columns: 1fr 1fr;
  }

  .guide-content,
  .feedback-content {
    grid-template-columns: 1fr;
  }

  .guide-related,
  .feedback-related {
    position: static;
  }

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

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: var(--header-height);
    flex-wrap: wrap;
    padding-top: var(--space-xs);
    padding-bottom: var(--space-xs);
  }

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

  .site-nav {
    flex-basis: 100%;
    order: 4;
    margin-left: 0;
  }

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

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

  .nav-list li {
    margin: 0;
  }

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

  .home-hero {
    grid-template-columns: 1fr;
    padding-top: var(--space-lg);
  }

  .hero-content h1 {
    font-size: 26px;
  }

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

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

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

  .rank-item {
    grid-template-columns: 100px 1fr;
    gap: var(--space-sm);
  }

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

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

  .footer-links {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .update-list {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }

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

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

@media (max-width: 480px) {
  .header-inner {
    padding: var(--space-xs) var(--space-sm);
  }

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

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

  .home-main,
  .inner-main {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }

  .update-list {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .update-info {
    padding: var(--space-xs);
  }

  .update-info h4 {
    font-size: 13px;
  }

  .update-status {
    font-size: 12px;
  }

  .update-info a {
    font-size: 13px;
  }

  .rank-item {
    grid-template-columns: 80px 1fr;
  }

  .rank-title {
    font-size: 16px;
  }

  .rank-reason {
    font-size: 14px;
  }

  .guide-section,
  .content-section,
  .feedback-section,
  .reason-section {
    padding: var(--space-md);
  }

  .step-list li {
    padding-left: 38px;
  }

  .step-list li::before {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .category-body {
    padding: var(--space-sm);
  }

  .footer-inner {
    padding: var(--space-lg) var(--space-sm) var(--space-md);
  }
}