/* ============================================================
   base — 全局基础样式
   ============================================================ */
:root {
  --color-primary: #1a1a2e;
  --color-secondary: #16213e;
  --color-accent: #0f3460;
  --color-highlight: #e94560;
  --color-bg: #f5f5f5;
  --color-white: #ffffff;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #e0e0e0;
  --font-heading: Arial, "Helvetica Neue", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --container-width: 1200px;
  --radius: 8px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-body);
  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;
}

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  line-height: 1.3;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

/* ============================================================
   layout — 全站布局骨架
   ============================================================ */

.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  position: relative;
}

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

.brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  border-radius: 4px;
  transition: background-color var(--transition), color var(--transition);
}

.nav-list li a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
}

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

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
}

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

.footer-col p {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 20px;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ============================================================
   components — 通用组件
   ============================================================ */

.btn {
  display: inline-block;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background-color: var(--color-highlight);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #c93a52;
  color: var(--color-white);
}

.btn-secondary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: #0a2747;
  color: var(--color-white);
}

.btn-ghost {
  background-color: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  margin-bottom: 20px;
  color: var(--color-text-light);
}

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

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

.breadcrumb-sep {
  color: #999;
}

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

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

/* 侧栏通用 */
.sidebar {
  min-width: 280px;
}

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

.sidebar-card h2,
.sidebar-block h2 {
  font-size: 17px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-highlight);
}

.sidebar-card h3,
.sidebar-block h3 {
  font-size: 16px;
  margin-bottom: 12px;
}

.sidebar-card p,
.sidebar-block p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.sidebar-links li,
.sidebar-card ul li,
.sidebar-content ul li {
  margin-bottom: 8px;
}

.sidebar-links li a,
.sidebar-card ul li a,
.sidebar-content ul li a {
  font-size: 14px;
  display: block;
  padding: 6px 0;
  border-bottom: 1px dashed var(--color-border);
}

.sidebar-links li a:hover,
.sidebar-card ul li a:hover,
.sidebar-content ul li a:hover {
  color: var(--color-highlight);
}

/* 图容器 */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 8px 0;
  line-height: 1.5;
}

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

.site-home {
  background-color: var(--color-bg);
}

/* 首屏 */
.hero-section {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 56px 0;
}

.hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.hero-actions .btn-primary {
  background-color: var(--color-highlight);
}

.hero-actions .btn-secondary {
  background-color: transparent;
  border: 2px solid rgba(255, 255, 255, 0.6);
}

.hero-actions .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.hero-actions .btn-ghost {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--color-white);
}

.hero-actions .btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.hero-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

/* 通用区块头 */
.section-head {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  margin-bottom: 28px;
}

.section-head h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
  position: relative;
  padding-left: 14px;
}

.section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 20px;
  background-color: var(--color-highlight);
  border-radius: 2px;
}

.section-head p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 频道分类导航 */
.channel-nav-section {
  padding: 48px 0 24px;
}

.channel-tag-list {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
}

.channel-tag {
  display: block;
  text-align: center;
  padding: 14px 10px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

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

/* 专题推荐 */
.topics-section {
  padding: 32px 0;
}

.topics-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

.topic-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

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

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

.topic-card-body h3 {
  font-size: 16px;
  margin-bottom: 8px;
  line-height: 1.4;
}

.topic-card-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.topic-card-body a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-highlight);
}

.topic-card-body a:hover {
  color: var(--color-accent);
}

/* 观看指南入口 */
.guide-entry-section {
  padding: 32px 0;
}

.guide-entry-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

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

.guide-entry-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.guide-entry-body h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.guide-entry-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
}

/* 最新动态 */
.updates-section {
  padding: 32px 0;
}

.updates-list {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.update-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.update-item time {
  font-size: 13px;
  color: var(--color-text-light);
  padding-top: 4px;
}

.update-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.update-item h3 a {
  color: var(--color-primary);
}

.update-item h3 a:hover {
  color: var(--color-highlight);
}

.update-item p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 首页底部相关链接 */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-right: 4px;
}

.related-links-item {
  font-size: 13px;
  padding: 4px 12px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  color: var(--color-accent);
}

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

/* ============================================================
   pages — 内页通用
   ============================================================ */

.site-inner {
  background-color: var(--color-bg);
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 20px;
}

/* 内页主内容 + 侧栏布局 */
.layout-shell {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

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

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

/* ============================================================
   pages — 频道分类页
   ============================================================ */

.page-channels {
  background-color: var(--color-bg);
}

/* 频道索引表 */
.channel-index {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.channel-index h2,
.channel-details h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.channel-index > p,
.channel-details > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.table-wrap {
  overflow-x: auto;
}

.channel-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.channel-table thead th {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
}

.channel-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.channel-table tbody tr:nth-child(even) {
  background-color: #fafafa;
}

.channel-table tbody tr:hover {
  background-color: #f0f4f8;
}

/* 频道详情 */
.channel-details {
  margin-bottom: 32px;
}

.channel-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  align-items: start;
}

.channel-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.channel-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.channel-figure {
  grid-row: span 2;
}

.channel-figure img {
  width: 160px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius);
}

/* 内页相关链接 */
.related-links {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 32px;
}

.related-links h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.related-links p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

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

.related-list li a {
  font-size: 14px;
  display: block;
  padding: 8px 12px;
  background-color: #f8f9fa;
  border-radius: 4px;
  transition: background-color var(--transition);
}

.related-list li a:hover {
  background-color: #eef1f5;
  color: var(--color-highlight);
}

/* ============================================================
   pages — 内容专题页
   ============================================================ */

.page-topics {
  background-color: var(--color-bg);
}

.topic-list-section {
  margin-bottom: 40px;
}

.topic-list-section > h2,
.topic-composition-section > h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

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

.topic-list-section .topic-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
  margin-bottom: 16px;
}

.topic-card-media img {
  width: 200px;
  height: 140px;
  object-fit: cover;
}

.topic-list-section .topic-card-body {
  padding: 16px 20px;
}

.topic-list-section .topic-card-body h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.topic-meta {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 6px 0;
  border-top: 1px dashed var(--color-border);
  margin-top: 8px;
}

.topic-composition-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.topic-composition-section > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.composition-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.composition-list li {
  background-color: #f8f9fa;
  border-radius: var(--radius);
  padding: 16px;
}

.composition-list h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.composition-list p {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

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

.topic-composition-section > p a {
  font-weight: 600;
}

.topic-composition-section > p a + a {
  margin-left: 16px;
}

/* ============================================================
   pages — 观看指南页
   ============================================================ */

.page-guide {
  background-color: var(--color-bg);
}

.guide-steps {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.guide-steps h2,
.verify-methods h2,
.guide-media h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.guide-steps > p,
.verify-methods > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.steps-list {
  counter-reset: step-counter;
}

.step-item {
  position: relative;
  padding: 16px 16px 16px 64px;
  margin-bottom: 12px;
  background-color: #f8f9fa;
  border-radius: var(--radius);
  counter-increment: step-counter;
}

.step-item::before {
  content: counter(step-counter);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 32px;
  height: 32px;
  background-color: var(--color-highlight);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
}

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

.step-item p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.step-item p:last-child {
  margin-bottom: 0;
}

/* 入口核验方法 */
.verify-methods {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.verify-list {
  counter-reset: verify-counter;
}

.verify-list li {
  position: relative;
  padding: 14px 14px 14px 56px;
  margin-bottom: 12px;
  background-color: #f8f9fa;
  border-radius: var(--radius);
  counter-increment: verify-counter;
}

.verify-list li::before {
  content: counter(verify-counter);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 28px;
  height: 28px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.verify-list li h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.verify-list li p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.verify-methods > p:last-child {
  margin-bottom: 0;
}

.verify-methods > p a {
  font-weight: 600;
}

/* 指南配图 */
.guide-media {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.guide-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.guide-media > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-top: 12px;
  margin-bottom: 0;
}

/* ============================================================
   pages — 入口核验页
   ============================================================ */

.page-verify {
  background-color: var(--color-bg);
}

.verify-steps {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.verify-steps h2,
.verify-warnings h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.content-media-inline {
  margin: 16px 0;
}

.content-media-inline img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.step-list {
  counter-reset: verify-step-counter;
}

.verify-steps .step-item {
  counter-increment: verify-step-counter;
  padding-left: 60px;
}

.verify-steps .step-item::before {
  content: counter(verify-step-counter);
  background-color: var(--color-accent);
  width: 30px;
  height: 30px;
  font-size: 14px;
}

/* 风险提示 */
.verify-warnings {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.warning-list li {
  padding: 12px 16px;
  margin-bottom: 10px;
  background-color: #fdf2f4;
  border-left: 4px solid var(--color-highlight);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.warning-list li h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.warning-list li p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 核验页相关链接 */
.verify-page-related {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.verify-page-related h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.verify-page-related ul li {
  margin-bottom: 8px;
}

.verify-page-related ul li a {
  font-size: 14px;
  display: block;
  padding: 8px 12px;
  background-color: #f8f9fa;
  border-radius: 4px;
}

.verify-page-related ul li a:hover {
  background-color: #eef1f5;
  color: var(--color-highlight);
}

/* ============================================================
   pages — 常见问题页
   ============================================================ */

.page-faq {
  background-color: var(--color-bg);
}

.faq-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.faq-section h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-highlight);
}

.faq-list {
  margin-top: 12px;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 4px 0;
}

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

.faq-item summary {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 12px 32px 12px 0;
  cursor: pointer;
  position: relative;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-highlight);
  font-weight: 400;
  transition: transform var(--transition);
}

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

.faq-item summary:hover {
  color: var(--color-highlight);
}

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

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

.site-error {
  background-color: var(--color-primary);
}

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 64px - 200px);
  padding: 40px 20px;
}

.error-panel {
  text-align: center;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 48px 40px;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-highlight);
  line-height: 1;
  margin-bottom: 16px;
  font-family: var(--font-heading);
}

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

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 10px 28px;
  background-color: var(--color-highlight);
  color: var(--color-white);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  transition: background-color var(--transition);
}

.error-btn:hover {
  background-color: #c93a52;
  color: var(--color-white);
}

/* ============================================================
   responsive — 响应式
   ============================================================ */

/* 平板 */
@media (max-width: 1024px) {
  .topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .layout-shell,
  .page-layout {
    grid-template-columns: 1fr 260px;
    gap: 24px;
  }
}

/* 手机 */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 8px 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 8px 0 16px;
  }

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

  .nav-list li a {
    padding: 12px 8px;
    border-radius: 4px;
  }

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

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

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

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

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

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

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

  .update-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

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

  .layout-shell,
  .page-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    min-width: 0;
    margin-top: 8px;
  }

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

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

  .channel-figure img {
    width: 100%;
    height: 160px;
  }

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

  .topic-card-media img {
    width: 100%;
    height: 180px;
  }

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

  .step-item {
    padding-left: 16px;
    padding-top: 56px;
  }

  .step-item::before {
    top: 12px;
    left: 16px;
  }

  .verify-list li {
    padding-left: 14px;
    padding-top: 52px;
  }

  .verify-list li::before {
    top: 10px;
    left: 14px;
  }

  .verify-steps .step-item {
    padding-left: 16px;
    padding-top: 56px;
  }

  .verify-steps .step-item::before {
    top: 12px;
    left: 16px;
  }

  .error-main {
    min-height: calc(100vh - 64px - 300px);
  }

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

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

/* 小屏手机 */
@media (max-width: 480px) {
  .brand-name {
    font-size: 18px;
  }

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

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

  .hero-actions .btn {
    width: 100%;
  }

  .channel-tag-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .channel-tag {
    padding: 12px 8px;
    font-size: 13px;
  }

  .section-head {
    padding: 0 16px;
  }

  .topics-grid,
  .guide-entry-grid,
  .updates-list,
  .related-links {
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    padding: 32px 16px 16px;
  }

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

  .channel-index,
  .channel-details,
  .guide-steps,
  .verify-methods,
  .guide-media,
  .verify-steps,
  .verify-warnings,
  .faq-section,
  .topic-composition-section {
    padding: 16px;
  }

  .channel-table {
    font-size: 13px;
  }

  .channel-table thead th,
  .channel-table tbody td {
    padding: 10px 8px;
  }
}