/* ==========================================================================
   51漫画 · 全站样式表
   开发者文档风：冷白背景、等宽代码感标签、蓝绿状态色、稳定左侧目录栏
   ========================================================================== */

/* ==========================================================================
   Base — 基础变量、重置、字体、通用元素
   ========================================================================== */

:root {
  /* 色彩系统 */
  --color-bg: #f6f8fa;
  --color-surface: #ffffff;
  --color-text: #1f2933;
  --color-text-secondary: #52606d;
  --color-text-muted: #7b8794;
  --color-primary: #0f9d8f;
  --color-primary-dark: #0b7a6f;
  --color-accent: #12b886;
  --color-border: #d9e2e8;
  --color-border-light: #e4e9ed;
  --color-code-bg: #f0f4f6;
  --color-teal-light: #e6f6f4;
  --color-green-light: #e8f7ef;
  --color-amber-light: #fdf3e3;
  --color-blue-light: #e8f0fb;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, Menlo,
    "Courier New", monospace;

  /* 布局 */
  --container-width: 1180px;
  --sidebar-width: 264px;
  --content-max: 860px;
  --header-height: 64px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(31, 41, 51, 0.06);
  --shadow-md: 0 4px 12px rgba(31, 41, 51, 0.08);
  --shadow-lg: 0 8px 24px rgba(31, 41, 51, 0.1);

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s 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: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 17px;
}

p {
  margin-bottom: 12px;
}

p:last-child {
  margin-bottom: 0;
}

/* 等宽字体用于元信息、标签、编号 */
.tag,
.status,
.rank-num,
.feed-time,
.archive-month,
.archive-count,
.step-num,
.step-number,
.method-index,
.dir-label,
.dir-code,
.legend-dot,
.card-tags,
.feed-meta,
.rank-meta,
.pick-meta,
.topic-item-meta,
.error-code,
.brand-tag,
.sidebar-label,
.related-links-label {
  font-family: var(--font-mono);
}

/* ==========================================================================
   Layout — 全站骨架容器
   ========================================================================== */

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

.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  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;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

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

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

.brand-tag {
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  line-height: 1.5;
}

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

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

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  line-height: 1.5;
}

.nav-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
}

.nav-list a.is-current {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
  font-weight: 600;
}

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

.nav-toggle:hover {
  background-color: var(--color-code-bg);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 56px;
  width: 100%;
}

/* 侧栏布局 — 侧栏在前，主内容在后 */
.sidebar-left {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 40px;
  align-items: start;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 56px;
  width: 100%;
}

/* 首页专用布局 */
.home-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border-light);
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.page-description {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 720px;
  line-height: 1.7;
}

.page-intro {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: 8px;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-col h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

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

.footer-col ul a {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border-light);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--color-text-muted);
  margin: 0;
  max-width: var(--container-width);
  margin: 0 auto;
}

/* ==========================================================================
   Components — 通用组件
   ========================================================================== */

/* 标签 */
.tag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  line-height: 1.5;
  white-space: nowrap;
}

.tag-serial {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
  border-color: rgba(15, 157, 143, 0.25);
}

.tag-done {
  color: var(--color-accent);
  background-color: var(--color-green-light);
  border-color: rgba(18, 184, 134, 0.25);
}

.tag-genre {
  color: var(--color-text-secondary);
  background-color: var(--color-code-bg);
}

.tag-status {
  font-weight: 500;
}

.tag-hot {
  color: #d97706;
  background-color: var(--color-amber-light);
  border-color: rgba(217, 119, 6, 0.2);
}

.tag-daily {
  color: #2563eb;
  background-color: var(--color-blue-light);
  border-color: rgba(37, 99, 235, 0.15);
}

.tag-love {
  color: #db2777;
  background-color: #fce7f3;
  border-color: rgba(219, 39, 119, 0.15);
}

.tag-mystery {
  color: #6d28d9;
  background-color: #ede9fe;
  border-color: rgba(109, 40, 217, 0.15);
}

.tag-fantasy {
  color: #0891b2;
  background-color: #cffafe;
  border-color: rgba(8, 145, 178, 0.15);
}

/* 状态标记 */
.status {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  line-height: 1.5;
  white-space: nowrap;
}

.status-complete {
  color: var(--color-accent);
  background-color: var(--color-green-light);
  border: 1px solid rgba(18, 184, 134, 0.25);
}

.status-serial {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
  border: 1px solid rgba(15, 157, 143, 0.25);
}

.ongoing {
  color: var(--color-primary);
}

.complete {
  color: var(--color-accent);
}

.hiatus {
  color: #d97706;
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 4px 0;
}

.text-link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* 章节区块 */
.section-block {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.section-block h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 680px;
}

.section-footer-link {
  margin-top: 24px;
  text-align: right;
}

.section-footer-link a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.section-footer-link a:hover {
  text-decoration: underline;
}

/* 侧栏通用 */
.sidebar-sticky {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.anchor-list li {
  margin-bottom: 2px;
}

.anchor-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.5;
}

.anchor-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
}

.anchor-list a.is-active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background-color: var(--color-teal-light);
  font-weight: 500;
}

/* 图片容器约束 */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 相关链接条 */
.related-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
  padding: 16px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.related-links-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.related-links-item {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 4px 10px;
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.related-links-item:hover {
  color: var(--color-primary);
  border-color: rgba(15, 157, 143, 0.3);
}

/* ==========================================================================
   Pages — 首页
   ========================================================================== */

/* 首页布局 */
.home-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 40px;
  align-items: start;
  padding-top: 32px;
  padding-bottom: 56px;
}

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

/* Hero 首屏 */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 32px 0 40px;
  border-bottom: 1px solid var(--color-border-light);
}

.hero-copy h1 {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 480px;
}

.tag-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-item {
  display: inline-block;
  font-size: 13px;
  font-family: var(--font-mono);
  padding: 4px 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.tag-item:hover {
  color: var(--color-primary);
  border-color: rgba(15, 157, 143, 0.4);
  background-color: var(--color-teal-light);
}

.hero-media {
  position: relative;
}

.hero-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  aspect-ratio: 4 / 3;
}

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

.continue-hint {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 24px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.continue-hint a {
  color: var(--color-primary);
  font-weight: 500;
}

.continue-hint a:hover {
  text-decoration: underline;
}

/* 01 起点 — 题材分类封面墙 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.category-card {
  display: block;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.category-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.category-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border-light);
}

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

.category-card p {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 0 16px 16px;
  line-height: 1.5;
  margin: 0;
}

/* 02 能力 — 最近更新 */
.update-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
}

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

.update-item {
  display: flex;
  gap: 16px;
  padding: 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  align-items: center;
}

.update-item img {
  width: 72px;
  height: 96px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.update-info {
  min-width: 0;
  flex: 1;
}

.update-info h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.update-info .meta-line {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.update-info .meta-line .tag {
  font-size: 11px;
}

.update-info .status {
  font-size: 11px;
}

/* 状态图例面板 */
.status-legend-panel {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  align-self: start;
}

.status-legend-panel h3 {
  font-size: 15px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

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

.legend-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 5px;
}

.legend-dot.dot-serial {
  background-color: var(--color-primary);
}

.legend-dot.dot-done {
  background-color: var(--color-accent);
}

.legend-dot.dot-pause {
  background-color: #d97706;
}

.legend-note {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border-light);
  line-height: 1.6;
}

.legend-note .text-link {
  font-size: 13px;
  margin-top: 4px;
}

/* 03 成果 — 人气榜单 */
.rank-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.rank-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--color-border-light);
  align-items: flex-start;
}

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

.rank-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-border);
  min-width: 36px;
  line-height: 1.4;
}

.rank-item:nth-child(1) .rank-num,
.rank-item:nth-child(2) .rank-num,
.rank-item:nth-child(3) .rank-num {
  color: var(--color-primary);
}

.rank-main {
  flex: 1;
  min-width: 0;
}

.rank-main h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.editor-note {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* 04 洞察 — 编辑专题 */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.topic-card {
  display: block;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.topic-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.topic-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border-light);
}

.topic-card h3 {
  font-size: 16px;
  padding: 14px 16px 4px;
}

.topic-card p {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 0 16px 16px;
  line-height: 1.5;
  margin: 0;
}

/* 05 方法 — 阅读指南与 FAQ */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

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

.step-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-teal-light);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.step-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

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

.faq-entry h3 {
  font-size: 16px;
  margin-bottom: 16px;
}

.faq-entry details {
  border-bottom: 1px solid var(--color-border-light);
  padding: 12px 0;
}

.faq-entry details:last-of-type {
  border-bottom: none;
}

.faq-entry summary {
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text);
  padding: 4px 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.faq-entry summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-size: 16px;
  flex-shrink: 0;
}

.faq-entry details[open] summary::before {
  content: "−";
}

.faq-entry details p {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 8px 0 4px 24px;
  line-height: 1.6;
}

.faq-more {
  margin-top: 16px;
  text-align: right;
}

.faq-more a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

/* 06 联系 — 反馈与站点说明 */
.feedback-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feedback-about,
.feedback-contact {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.feedback-about h3,
.feedback-contact h3 {
  font-size: 16px;
  margin-bottom: 12px;
}

.feedback-about p,
.feedback-contact p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.feedback-contact p a {
  font-weight: 500;
}

/* ==========================================================================
   Pages — 题材分类 (51mh/fenlei.html)
   ========================================================================== */

.category-tree {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.category-tree h2 {
  font-size: 15px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.category-tree ul li {
  margin-bottom: 2px;
}

.category-tree ul a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.5;
}

.category-tree ul a:hover {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
}

.tree-note {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border-light);
  line-height: 1.6;
}

.category-detail {
  min-width: 0;
}

.category-card-grid {
  margin-bottom: 40px;
}

.category-card-grid h2 {
  font-size: 22px;
  margin-bottom: 24px;
}

.category-card-grid .category-card {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 0;
  margin-bottom: 20px;
  overflow: hidden;
}

.category-card-grid .category-card .card-media {
  overflow: hidden;
}

.category-card-grid .category-card .card-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-bottom: none;
  border-right: 1px solid var(--color-border-light);
}

.category-card-grid .category-card .card-body {
  padding: 16px 20px;
  min-width: 0;
}

.category-card-grid .category-card h3 {
  font-size: 17px;
  padding: 0;
  margin-bottom: 6px;
}

.card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.category-card-grid .category-card .card-body p {
  padding: 0;
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 8px;
}

.card-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
}

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

/* 浏览帮助 */
.browse-help {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.browse-help h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.help-item {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 16px;
}

.help-item h3 {
  font-size: 14px;
  margin-bottom: 8px;
}

.help-item p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.help-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.help-links p {
  font-size: 14px;
}

.help-links a {
  font-weight: 500;
}

/* ==========================================================================
   Pages — 最近更新 (51mh/gengxin.html)
   ========================================================================== */

.chapter-dir {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.dir-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.dir-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.dir-code {
  font-size: 11px;
  color: var(--color-text-muted);
  background-color: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.dir-list li {
  margin-bottom: 2px;
}

.dir-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.5;
}

.dir-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
}

.dir-note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border-light);
}

.dir-note p {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 6px;
}

/* 更新列表 */
.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 22px;
  margin-bottom: 6px;
}

.section-heading .section-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.update-feed {
  margin-bottom: 48px;
}

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

.feed-item {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 12px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.feed-cover {
  width: 56px;
  height: 72px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

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

.feed-title {
  font-size: 15px;
  margin-bottom: 4px;
}

.feed-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.feed-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 4px;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.feed-time {
  font-size: 12px;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.feed-footer {
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.feed-footer a {
  font-weight: 500;
}

/* 状态说明 */
.status-legend {
  margin-bottom: 48px;
}

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

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

.legend-card .legend-dot {
  width: 12px;
  height: 12px;
  margin-bottom: 12px;
}

.legend-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.legend-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.status-legend .legend-note {
  margin-top: 20px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.status-legend .legend-note a {
  font-weight: 500;
}

/* 月份归档 */
.month-archive {
  margin-bottom: 16px;
}

.archive-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.archive-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.archive-item:hover {
  border-color: rgba(15, 157, 143, 0.4);
  box-shadow: var(--shadow-sm);
}

.archive-month {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.archive-count {
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-code-bg);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.archive-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.archive-note a {
  font-weight: 500;
}

/* ==========================================================================
   Pages — 人气榜单 (51mh/paihang.html)
   ========================================================================== */

.rank-switch {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-title {
  font-size: 15px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.rank-switch-list li {
  margin-bottom: 2px;
}

.rank-switch-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.5;
}

.rank-switch-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
}

.sidebar-note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border-light);
}

.sidebar-note p {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* 榜单区块 */
.rank-section {
  margin-bottom: 48px;
}

.section-head {
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.section-head h2 {
  font-size: 22px;
  margin-bottom: 4px;
}

.section-note {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
}

/* 主榜单 */
.rank-list-primary {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.rank-item-top {
  display: grid;
  grid-template-columns: 44px 96px 1fr;
  gap: 16px;
  padding: 20px;
  align-items: center;
  border-bottom: 1px solid var(--color-border-light);
  background-color: var(--color-surface);
}

.rank-item-top:last-child {
  border-bottom: 1px solid var(--color-border-light);
}

.rank-item-top .rank-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.rank-cover {
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 3 / 4;
}

.rank-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.rank-info {
  min-width: 0;
}

.rank-info h3 {
  font-size: 17px;
  margin-bottom: 4px;
}

.rank-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.rank-reason {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.rank-list-primary .rank-item:not(.rank-item-top) {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 14px 20px;
  align-items: start;
  border-bottom: 1px solid var(--color-border-light);
}

.rank-list-primary .rank-item:not(.rank-item-top):last-child {
  border-bottom: none;
}

.rank-list-primary .rank-item:not(.rank-item-top) .rank-num {
  font-size: 18px;
  color: var(--color-border);
}

.rank-info-compact h3 {
  font-size: 15px;
}

.rank-info-compact .rank-reason {
  font-size: 12px;
}

/* 题材榜 */
.genre-rank-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.genre-rank-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.genre-rank-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.genre-rank-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
}

.genre-rank-example {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.genre-rank-example a {
  font-weight: 500;
}

/* 编辑推荐 */
.editor-pick-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.editor-pick-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.pick-cover {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border-light);
}

.pick-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pick-info {
  padding: 16px;
}

.pick-info h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.pick-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.pick-comment {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.rank-footer-links {
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.rank-footer-links a {
  font-weight: 500;
}

/* ==========================================================================
   Pages — 编辑专题 (51mh/zhuanti.html)
   ========================================================================== */

.topic-dir {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.dir-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

/* 专题引言 */
.topic-intro {
  margin-bottom: 48px;
}

.topic-intro-inner {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.topic-intro-text h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

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

.topic-intro-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

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

.topic-intro-media figcaption {
  font-size: 12px;
  color: var(--color-text-muted);
  padding: 8px 12px;
  background-color: var(--color-code-bg);
  border-top: 1px solid var(--color-border-light);
}

/* 专题书单 */
.topic-list {
  margin-bottom: 48px;
}

.topic-list > h2 {
  font-size: 22px;
  margin-bottom: 6px;
}

.topic-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 16px;
}

.topic-item-media {
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 3 / 4;
}

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

.topic-item-body {
  min-width: 0;
}

.topic-item-body h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.topic-item-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.topic-item-body p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 8px;
}

.editor-note {
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-code-bg);
  border-left: 3px solid var(--color-primary);
  padding: 8px 12px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.6;
  margin: 0;
}

/* 往期专题 */
.past-topics {
  margin-bottom: 48px;
}

.past-topics > h2 {
  font-size: 22px;
  margin-bottom: 6px;
}

.past-topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.past-topic-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.past-topic-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border-light);
}

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

.past-topic-body {
  padding: 16px;
}

.past-topic-body h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.past-topic-body p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 6px;
}

/* 专题桥接 */
.topic-bridge {
  margin-bottom: 16px;
}

.topic-bridge > h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

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

.bridge-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.bridge-item h3 {
  font-size: 14px;
  margin-bottom: 8px;
}

.bridge-item p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   Pages — 阅读指南 (51mh/yuedu.html)
   ========================================================================== */

.step-dir {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.step-dir h2 {
  font-size: 15px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.step-dir ul li {
  margin-bottom: 2px;
}

.step-dir ul a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.5;
}

.step-dir ul a:hover {
  color: var(--color-primary);
  background-color: var(--color-teal-light);
}

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

/* 分步说明 */
.step-guide {
  margin-bottom: 48px;
}

.step-guide > h2 {
  font-size: 22px;
  margin-bottom: 24px;
}

.guide-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border-light);
}

.guide-step:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-teal-light);
  border: 1px solid rgba(15, 157, 143, 0.25);
  border-radius: var(--radius-md);
}

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

.step-body h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.step-body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.step-body p a {
  font-weight: 500;
}

.guide-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-top: 12px;
  max-width: 480px;
}

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

/* FAQ 列表 */
.faq-list {
  margin-bottom: 48px;
}

.faq-list > h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  padding: 14px 20px;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
}

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

.faq-item summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-size: 16px;
  flex-shrink: 0;
}

.faq-item[open] summary::before {
  content: "−";
}

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

.faq-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 14px 20px;
  line-height: 1.7;
  margin: 0;
}

.faq-item p a {
  font-weight: 500;
}

/* 反馈说明 */
.feedback-note {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
}

.feedback-note h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.feedback-note p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.feedback-note p a {
  font-weight: 500;
}

/* ==========================================================================
   Pages — 关于本站 (51mh/guanyu.html)
   ========================================================================== */

.about-dir {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.dir-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

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

/* 站点定位 */
.positioning {
  margin-bottom: 48px;
}

.positioning > h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.positioning-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.positioning-text p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.positioning-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

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

.positioning-media figcaption {
  font-size: 12px;
  color: var(--color-text-muted);
  padding: 8px 12px;
  background-color: var(--color-code-bg);
  border-top: 1px solid var(--color-border-light);
}

/* 编辑方法 */
.editorial-method {
  margin-bottom: 48px;
}

.editorial-method > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-intro {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.method-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

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

.method-index {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-teal-light);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.method-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.method-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* 版权说明 */
.copyright {
  margin-bottom: 48px;
}

.copyright > h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.copyright p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* ==========================================================================
   Pages — 404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.error-panel {
  text-align: center;
  max-width: 520px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
}

.error-code {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 8px;
}

.error-panel h1 {
  font-size: 22px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.error-home-btn {
  display: inline-block;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}

.error-home-btn:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

.error-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.error-links a {
  font-size: 14px;
  font-weight: 500;
}

/* ==========================================================================
   Responsive — 响应式
   ========================================================================== */

/* 平板 */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 24px;
  }

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

  .genre-rank-grid,
  .editor-pick-list,
  .past-topic-grid,
  .method-cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .status-legend-panel {
    margin-top: 8px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-media {
    max-width: 480px;
  }

  .topic-intro-inner,
  .positioning-grid {
    grid-template-columns: 1fr;
  }

  .topic-intro-media,
  .positioning-media {
    max-width: 480px;
  }

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

/* 手机 */
@media (max-width: 900px) {
  /* 导航切换 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: block;
    padding: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 2px;
  }

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

  .nav-list a {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: var(--radius-md);
  }

  /* 侧栏布局降级为单列，H1 和核心内容在辅助侧栏之前 */
  .sidebar-left {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 16px 48px;
  }

  .inner-main {
    padding: 24px 16px 48px;
  }

  .home-layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 16px 48px;
  }

  /* 侧栏在移动端变为横向标签条，放在核心内容之后 */
  .anchor-sidebar,
  .category-tree,
  .chapter-dir,
  .rank-switch,
  .topic-dir,
  .step-dir,
  .about-dir {
    position: static;
    order: 2;
    padding: 16px;
  }

  .anchor-sidebar .sidebar-sticky {
    position: static;
  }

  .anchor-list,
  .dir-list,
  .rank-switch-list,
  .step-dir ul,
  .category-tree ul {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .anchor-list li,
  .dir-list li,
  .rank-switch-list li,
  .step-dir ul li,
  .category-tree ul li {
    margin: 0;
  }

  .anchor-list a,
  .dir-list a,
  .rank-switch-list a,
  .step-dir ul a,
  .category-tree ul a {
    padding: 6px 12px;
    border-left: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 13px;
    white-space: nowrap;
  }

  .anchor-list a.is-active {
    border-color: rgba(15, 157, 143, 0.4);
    background-color: var(--color-teal-light);
  }

  .sidebar-label,
  .dir-label,
  .tree-note,
  .dir-note,
  .sidebar-note {
    margin-bottom: 10px;
  }

  .dir-heading {
    margin-bottom: 10px;
  }

  /* H1 和核心内容在辅助侧栏之前 */
  .sidebar-left .inner-main,
  .sidebar-left .page-content,
  .sidebar-left .category-detail,
  .sidebar-left .guide-content,
  .sidebar-left main.site-main,
  .sidebar-left .site-main {
    order: 1;
  }

  /* 首页 */
  .hero {
    grid-template-columns: 1fr;
    padding: 24px 0 32px;
  }

  .hero-copy h1 {
    font-size: 28px;
  }

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

  .continue-hint {
    grid-column: 1;
  }

  /* 首页网格收窄 */
  .category-grid,
  .topic-grid {
    grid-template-columns: 1fr;
  }

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

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

  /* 分类页 */
  .category-card-grid .category-card {
    grid-template-columns: 100px 1fr;
  }

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

  /* 更新页 */
  .feed-item {
    grid-template-columns: 48px 1fr;
    gap: 12px;
  }

  .feed-cover {
    width: 48px;
    height: 64px;
  }

  .feed-time {
    grid-column: 2;
    font-size: 11px;
  }

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

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

  /* 榜单页 */
  .rank-item-top {
    grid-template-columns: 36px 72px 1fr;
    gap: 12px;
    padding: 16px;
  }

  .rank-item-top .rank-num {
    font-size: 22px;
  }

  .rank-list-primary .rank-item:not(.rank-item-top) {
    grid-template-columns: 36px 1fr;
    gap: 12px;
    padding: 12px 16px;
  }

  .genre-rank-grid,
  .editor-pick-list {
    grid-template-columns: 1fr;
  }

  /* 专题页 */
  .topic-item {
    grid-template-columns: 88px 1fr;
    gap: 14px;
    padding: 12px;
  }

  .past-topic-grid,
  .bridge-links {
    grid-template-columns: 1fr;
  }

  .topic-intro-inner,
  .positioning-grid {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  /* 阅读指南页 */
  .guide-step {
    grid-template-columns: 40px 1fr;
    gap: 14px;
  }

  .step-number {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

  /* 关于页 */
  .method-cards {
    grid-template-columns: 1fr;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    padding: 16px;
  }

  /* 面包屑 */
  .breadcrumb {
    margin-bottom: 16px;
  }

  /* 页面标题 */
  .page-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
  }

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

  /* 相关链接 */
  .related-links {
    margin-top: 24px;
  }

  /* 404 */
  .error-main {
    padding: 48px 16px;
  }

  .error-panel {
    padding: 32px 20px;
  }

  .error-code {
    font-size: 36px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .brand-tag {
    display: none;
  }

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

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

  .category-card-grid .category-card .card-media img {
    aspect-ratio: 16 / 10;
    border-right: none;
    border-bottom: 1px solid var(--color-border-light);
  }

  .rank-item-top {
    grid-template-columns: 32px 64px 1fr;
    gap: 10px;
    padding: 12px;
  }

  .rank-cover {
    aspect-ratio: 3 / 4;
  }

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

  .topic-item-media {
    max-width: 160px;
  }

  .feed-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .feed-cover {
    width: 100%;
    height: auto;
    max-width: 72px;
    aspect-ratio: 3 / 4;
  }

  .feed-time {
    grid-column: 1;
  }

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

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}