/* ==========================================================================
   周一的救星蛙漫台版 · 全站样式表
   版本：1.0
   说明：本文件为整站唯一样式表，覆盖首页、内页、404 页全部 DOM。
   ========================================================================== */

/* ==========================================================================
   1. Base —— 重置、变量、全局基础
   ========================================================================== */

:root {
  --color-primary: #FF6B6B;
  --color-secondary: #4ECDC4;
  --color-bg: #F7FFF7;
  --color-text: #2D3436;
  --color-accent: #FFE66D;
  --color-white: #ffffff;
  --color-gray-light: #f0f4f0;
  --color-gray: #6b7a70;
  --color-border: #dce8dc;
  --color-dark: #1f2a24;

  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;

  --container-width: 1200px;
  --header-height: 72px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 3px rgba(45, 52, 54, 0.08);
  --shadow-md: 0 4px 12px rgba(45, 52, 54, 0.08);

  --transition-base: 0.2s ease;

  --content-max: 860px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

ul,
ol {
  list-style: none;
}

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

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

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

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1rem;
}

/* ==========================================================================
   2. Layout —— 全站骨架、容器、页头、页脚
   ========================================================================== */

/* 全站统一容器 */
.header-inner,
.footer-inner,
.site-main,
.layout-shell,
.page-layout {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ---------- 页头 ---------- */

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 24px;
  position: relative;
}

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

.brand-name {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

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

/* 主导航 */
.site-nav {
  margin-left: auto;
}

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-list li a:hover {
  color: var(--color-primary);
  background-color: rgba(255, 107, 107, 0.08);
}

.nav-list li a.is-current {
  color: var(--color-primary);
  background-color: rgba(255, 107, 107, 0.1);
  font-weight: 600;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ---------- 页脚 ---------- */

.site-footer {
  background-color: var(--color-dark);
  color: rgba(255, 255, 255, 0.85);
  margin-top: auto;
  padding: 48px 0 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer-desc {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 640px;
  margin-bottom: 0;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.footer-nav li a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.75);
  padding: 4px 0;
  display: inline-block;
}

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

.footer-copyright {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 16px;
  margin-bottom: 0;
}

/* ---------- 主内容区通用 ---------- */

.site-main {
  flex: 1 0 auto;
  padding-top: 40px;
  padding-bottom: 56px;
}

/* 内页统一布局 */
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
  padding-top: 40px;
  padding-bottom: 56px;
}

.site-main.inner-main {
  padding-top: 0;
  padding-bottom: 0;
  min-width: 0;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-gray);
  margin-bottom: 20px;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2rem;
  margin-bottom: 12px;
}

.page-description {
  font-size: 1rem;
  color: var(--color-gray);
  max-width: 720px;
  margin-bottom: 0;
}

/* ---------- 侧栏 ---------- */

.sidebar {
  min-width: 0;
}

.sidebar-card,
.sidebar-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.sidebar-title,
.sidebar-block h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

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

.sidebar-links li a {
  font-size: 0.9375rem;
  color: var(--color-text);
  display: inline-block;
  padding: 2px 0;
  position: relative;
}

.sidebar-links li a::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--color-secondary);
  border-radius: 50%;
  margin-right: 10px;
  vertical-align: middle;
}

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

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

/* ---------- 封面图容器 ---------- */

.hero-figure,
.update-thumb,
.rank-cover,
.category-cover,
.guide-media,
.content-media {
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-gray-light);
}

.hero-figure img,
.update-thumb img,
.rank-cover img,
.category-cover img,
.guide-media img,
.content-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 区块标题与描述 ---------- */

.section-title {
  font-size: 1.375rem;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--color-gray);
  font-size: 0.9375rem;
  margin-bottom: 24px;
}

.section-desc a {
  font-weight: 500;
}

/* ---------- 返回顶部按钮（由 JS 注入 .back-top 类） ---------- */

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  box-shadow: var(--shadow-md);
  z-index: 90;
  display: none;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-base);
}

.back-top.is-visible {
  display: flex;
}

.back-top:hover {
  background-color: var(--color-secondary);
}

/* ==========================================================================
   4. Pages —— 首页
   ========================================================================== */

/* ---------- 首屏 Hero ---------- */

.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0;
}

.hero-text h1 {
  font-size: 2.5rem;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-text p {
  font-size: 1.0625rem;
  color: var(--color-gray);
  margin-bottom: 28px;
  max-width: 480px;
}

.cta-button {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  margin-right: 12px;
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.cta-button:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.cta-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.cta-secondary:hover {
  background-color: rgba(255, 107, 107, 0.08);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.hero-figure {
  width: 100%;
  aspect-ratio: 4 / 3;
  box-shadow: var(--shadow-md);
}

.hero-figure figcaption {
  padding: 12px 16px;
  font-size: 0.875rem;
  color: var(--color-gray);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

/* ---------- 题材分类导航带 ---------- */

.category-nav-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

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

.category-tag-list li a {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  transition: border-color var(--transition-base), background-color var(--transition-base), color var(--transition-base);
}

.category-tag-list li a:hover {
  border-color: var(--color-primary);
  background-color: rgba(255, 107, 107, 0.06);
  color: var(--color-primary);
}

/* ---------- 最近更新 ---------- */

.recent-updates-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.update-group {
  margin-bottom: 32px;
}

.update-group h3 {
  font-size: 1.125rem;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

.update-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.update-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px;
  align-items: flex-start;
  transition: box-shadow var(--transition-base);
}

.update-item:hover {
  box-shadow: var(--shadow-md);
}

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

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

.update-info h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.update-status {
  display: inline-block;
  font-size: 0.8125rem;
  color: var(--color-secondary);
  background-color: rgba(78, 205, 196, 0.1);
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 500;
}

/* ---------- 人气榜单预览 ---------- */

.ranking-preview-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.ranking-preview-list {
  counter-reset: rank-counter;
}

.ranking-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 12px;
  transition: box-shadow var(--transition-base);
}

.ranking-item:hover {
  box-shadow: var(--shadow-md);
}

.rank-number {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-secondary);
  min-width: 36px;
  line-height: 1.2;
}

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

.rank-content h3 {
  font-size: 1.0625rem;
  margin-bottom: 4px;
}

.rank-content h3 a {
  color: var(--color-text);
}

.rank-content h3 a:hover {
  color: var(--color-primary);
}

.rank-reason {
  font-size: 0.9375rem;
  color: var(--color-gray);
  margin-bottom: 6px;
}

.rank-change {
  font-size: 0.8125rem;
  color: var(--color-gray);
}

/* ---------- 指南入口 ---------- */

.guide-entry-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.guide-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.guide-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: box-shadow var(--transition-base);
}

.guide-card:hover {
  box-shadow: var(--shadow-md);
}

.guide-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

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

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

.guide-card p {
  color: var(--color-gray);
  font-size: 0.9375rem;
  margin-bottom: 16px;
}

.guide-card > a {
  font-weight: 500;
  font-size: 0.9375rem;
}

/* ---------- 版权与反馈说明 ---------- */

.copyright-feedback-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  margin-top: 8px;
  padding: 32px;
}

.copyright-feedback-section h2 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.copyright-feedback-section p {
  color: var(--color-gray);
  font-size: 0.9375rem;
  max-width: 760px;
}

/* ==========================================================================
   5. Pages —— 内页共用
   ========================================================================== */

/* ---------- 题材分类页 ---------- */

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.category-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.category-card:hover {
  box-shadow: var(--shadow-md);
}

.category-cover {
  aspect-ratio: 16 / 10;
}

.category-name {
  font-size: 1.125rem;
  padding: 16px 16px 4px;
}

.category-desc {
  font-size: 0.9375rem;
  color: var(--color-gray);
  padding: 0 16px;
  margin-bottom: 8px;
}

.category-example {
  font-size: 0.875rem;
  color: var(--color-secondary);
  padding: 0 16px 16px;
  margin-bottom: 0;
}

.category-guide {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.guide-text {
  color: var(--color-gray);
  font-size: 0.9375rem;
  margin-bottom: 12px;
}

.guide-text:last-child {
  margin-bottom: 0;
}

/* ---------- 阅读指南页 ---------- */

.guide-steps {
  margin-bottom: 40px;
}

.guide-steps h2 {
  font-size: 1.25rem;
  margin: 32px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

.guide-steps h2:first-child {
  margin-top: 0;
}

.guide-steps p {
  color: var(--color-text);
  font-size: 0.9375rem;
  margin-bottom: 12px;
}

.guide-steps a {
  font-weight: 500;
}

.guide-tips {
  margin-bottom: 40px;
}

.guide-tips > h2 {
  font-size: 1.25rem;
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.tip-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-base);
}

.tip-card:hover {
  box-shadow: var(--shadow-md);
}

.tip-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.tip-card p {
  font-size: 0.875rem;
  color: var(--color-gray);
  margin-bottom: 0;
}

.guide-media {
  max-width: 640px;
  margin: 0 auto 24px;
}

.guide-media figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-gray);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

/* ---------- 最近更新页 ---------- */

.update-section {
  margin-bottom: 40px;
}

.update-section .update-group {
  margin-bottom: 0;
}

.update-section .update-item {
  margin-bottom: 12px;
}

.update-thumb {
  width: 96px;
  height: 128px;
  flex-shrink: 0;
}

.update-title {
  font-size: 1.0625rem;
  margin-bottom: 4px;
}

.update-meta {
  font-size: 0.8125rem;
  color: var(--color-gray);
  margin-bottom: 6px;
}

.update-desc {
  font-size: 0.9375rem;
  color: var(--color-gray);
  margin-bottom: 8px;
  line-height: 1.6;
}

.update-info a {
  font-size: 0.875rem;
  font-weight: 500;
}

.more-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 32px;
}

.more-links a {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* ---------- 人气榜单页 ---------- */

.ranking-list {
  margin-bottom: 40px;
}

.ranking-list .ranking-item {
  align-items: center;
}

.rank-cover {
  width: 72px;
  height: 96px;
  flex-shrink: 0;
}

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

.rank-title {
  font-size: 1.0625rem;
  margin-bottom: 4px;
}

.rank-reason {
  font-size: 0.9375rem;
  color: var(--color-gray);
  margin-bottom: 6px;
}

.rank-change {
  font-size: 0.875rem;
}

.trend {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
}

.trend.up {
  background-color: rgba(78, 205, 196, 0.12);
  color: var(--color-secondary);
}

.trend.down {
  background-color: rgba(255, 107, 107, 0.1);
  color: var(--color-primary);
}

.trend.new {
  background-color: rgba(255, 230, 109, 0.2);
  color: #8a6d00;
}

.ranking-change,
.ranking-reasons {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
}

.ranking-change h2,
.ranking-reasons h2 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.ranking-change p,
.ranking-reasons p {
  font-size: 0.9375rem;
  color: var(--color-gray);
}

.ranking-reasons ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 12px;
}

.ranking-reasons li {
  font-size: 0.9375rem;
  color: var(--color-gray);
  margin-bottom: 6px;
}

.ranking-reasons li strong {
  color: var(--color-text);
}

.ranking-reasons a {
  font-weight: 500;
  margin-right: 16px;
}

.guide-entry {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.guide-entry h2 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.guide-entry p {
  font-size: 0.9375rem;
  color: var(--color-gray);
}

.guide-entry a {
  font-weight: 500;
  margin-right: 16px;
}

/* ---------- 常见问题页 ---------- */

.faq-section {
  margin-bottom: 40px;
}

.faq-section .content-media {
  max-width: 480px;
  margin: 0 auto 20px;
}

.content-media-inline figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-gray);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

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

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color var(--transition-base);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 400;
  transition: transform var(--transition-base);
}

.faq-item[open] summary {
  background-color: rgba(78, 205, 196, 0.06);
}

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

.faq-answer {
  padding: 0 20px 16px;
}

.faq-answer p {
  font-size: 0.9375rem;
  color: var(--color-gray);
  margin-bottom: 8px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* 相关阅读推荐 */
.faq-related {
  margin-bottom: 40px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.related-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-base);
}

.related-card:hover {
  box-shadow: var(--shadow-md);
}

.related-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-text);
}

.related-card:hover h3 {
  color: var(--color-primary);
}

.related-card p {
  font-size: 0.875rem;
  color: var(--color-gray);
  margin-bottom: 0;
}

/* ==========================================================================
   6. Pages —— 404 错误页
   ========================================================================== */

.error-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
  padding-bottom: 80px;
  text-align: center;
}

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

.error-code {
  font-family: var(--font-sans);
  font-size: 6rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.error-desc,
.error-tip {
  font-size: 1rem;
  color: var(--color-gray);
  margin-bottom: 12px;
}

.error-back {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
}

.error-back:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.error-links {
  margin-top: 48px;
  text-align: left;
  width: 100%;
  max-width: 560px;
}

.error-links h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

.error-links ul li {
  margin-bottom: 8px;
}

.error-links ul li a {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* ==========================================================================
   7. Responsive —— 响应式
   ========================================================================== */

/* ---------- 平板与窄桌面 ---------- */

@media (max-width: 1024px) {
  .layout-shell {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 24px;
  }

  .category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tips-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 移动端 ---------- */

@media (max-width: 768px) {
  .header-inner,
  .footer-inner,
  .site-main,
  .layout-shell,
  .page-layout {
    padding-left: 16px;
    padding-right: 16px;
  }

  /* 页头 */
  .site-header {
    position: sticky;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    margin-left: 0;
  }

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

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

  .nav-list li a {
    padding: 14px 8px;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }

  .nav-list li:last-child a {
    border-bottom: none;
  }

  /* 内页布局切换为单列 */
  .layout-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .sidebar {
    margin-top: 32px;
    order: 2;
  }

  .site-main.inner-main {
    order: 1;
  }

  /* 首页 hero */
  .hero-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 0;
  }

  .hero-text h1 {
    font-size: 1.75rem;
  }

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

  .cta-button {
    display: block;
    text-align: center;
    margin-right: 0;
    margin-bottom: 12px;
  }

  /* 更新列表 */
  .update-list {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 指南卡片 */
  .guide-cards {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 分类网格 */
  .category-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 提示卡片 */
  .tips-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 相关推荐 */
  .related-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 榜单条目 */
  .ranking-item {
    flex-wrap: wrap;
    gap: 12px;
  }

  .rank-number {
    min-width: 28px;
    font-size: 1.25rem;
  }

  .rank-cover {
    width: 64px;
    height: 88px;
  }

  /* 更新条目 */
  .update-thumb {
    width: 80px;
    height: 108px;
  }

  /* 页脚 */
  .footer-nav ul {
    gap: 8px 16px;
  }

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

  /* 404 */
  .error-code {
    font-size: 4rem;
  }

  .error-main {
    padding-top: 48px;
    padding-bottom: 48px;
  }
}

/* ---------- 小屏手机 ---------- */

@media (max-width: 390px) {
  .brand-name {
    font-size: 1.0625rem;
  }

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

  .hero-text h1 {
    font-size: 1.5rem;
  }

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

  .update-item {
    padding: 10px;
    gap: 12px;
  }

  .update-item img {
    width: 64px;
    height: 88px;
  }

  .update-thumb {
    width: 72px;
    height: 96px;
  }

  .rank-cover {
    width: 56px;
    height: 76px;
  }

  .sidebar-card,
  .sidebar-block {
    padding: 16px;
  }

  .guide-card,
  .tip-card,
  .ranking-change,
  .ranking-reasons,
  .guide-entry,
  .category-guide {
    padding: 16px;
  }
}