/* ============================================================
   BASE / 基础变量与重置
   ============================================================ */
:root {
  --color-bg: #f5f7f6;
  --color-surface: #ffffff;
  --color-text: #2c3e50;
  --color-text-light: #5d6b7a;
  --color-accent: #1abc9c;
  --color-accent-dark: #16a085;
  --color-accent-light: #e8f8f4;
  --color-border: #e0e0e0;
  --color-muted: #8a97a5;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 3px rgba(44, 62, 80, 0.08);
  --shadow-md: 0 4px 16px rgba(44, 62, 80, 0.1);
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

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

/* ============================================================
   LAYOUT / 全站骨架（程序锁定）
   ============================================================ */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
}

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

.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: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 40px;
}

.footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-muted);
  font-size: 14px;
}

/* 内页统一骨架 */
.site-inner .site-main,
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 0;
  width: 100%;
}

/* ============================================================
   COMPONENTS / 通用组件
   ============================================================ */
/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

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

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

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

/* 页头标题区（内页统一） */
.page-header {
  margin-bottom: 40px;
}

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

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
}

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  max-width: 760px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  transition: background-color var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent-dark);
  border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent-light);
  color: var(--color-accent-dark);
}

/* 图片容器约束 */
figure {
  margin: 0;
}

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

/* ============================================================
   HEADER / 品牌与导航
   ============================================================ */
.brand {
  flex-shrink: 0;
}

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 2px;
}

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list li a:hover {
  color: var(--color-accent-dark);
  background-color: var(--color-accent-light);
}

.nav-list li a.is-current {
  color: var(--color-accent-dark);
  background-color: var(--color-accent-light);
  font-weight: 500;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ============================================================
   PAGES / 首页
   ============================================================ */
.home-main {
  width: 100%;
}

/* 首屏 Hero */
.hero-section {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 48px;
}

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

.hero-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-description {
  font-size: 16px;
  color: var(--color-text-light);
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-media {
  position: relative;
}

.hero-figure {
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

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

/* 通用区块 */
.section-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 0;
}

.section-heading {
  margin-bottom: 8px;
}

/* 频道标签导航带 */
.channel-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 8px 0 8px;
}

.channel-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 14px;
  color: var(--color-text);
  transition: border-color var(--transition-fast), color var(--transition-fast),
    background-color var(--transition-fast);
}

.channel-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
  background-color: var(--color-accent-light);
}

/* 专题网格 */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.topic-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.topic-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  width: 100%;
}

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

.topic-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.topic-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.topic-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.topic-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent-dark);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.topic-link:hover {
  color: var(--color-accent);
}

/* 观看指南入口 */
.guide-entry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.guide-entry-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-accent);
}

.guide-entry-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.guide-entry-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent-dark);
}

.guide-entry-link:hover {
  color: var(--color-accent);
}

/* 反馈说明 */
.feedback-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 0;
}

.feedback-inner {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

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

.feedback-text {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 760px;
}

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

.feedback-meta a {
  color: var(--color-accent-dark);
}

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

/* ============================================================
   PAGES / 频道分类页
   ============================================================ */
.page-channels .inner-main {
  padding-bottom: 0;
}

/* 频道网格 */
.channel-list-section {
  margin-bottom: 40px;
}

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

.channel-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.channel-card:hover {
  box-shadow: var(--shadow-sm);
}

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

.channel-card-content {
  padding: 16px 20px 20px;
}

.channel-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

/* 分类详情 */
.category-detail-section {
  margin-bottom: 40px;
}

.category-detail-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.category-detail-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.detail-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-accent-dark);
}

.detail-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.65;
}

/* 相关链接 */
.related-links-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 8px;
}

.related-links-intro {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.related-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  background-color: var(--color-accent-light);
  color: var(--color-accent-dark);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.related-link:hover {
  background-color: #d0f0e8;
  color: var(--color-accent-dark);
}

/* ============================================================
   PAGES / 使用指南页
   ============================================================ */
.guide-summary {
  margin-bottom: 48px;
}

.summary-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.summary-media {
  width: 100%;
}

.guide-figure {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  width: 100%;
}

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

.summary-content p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

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

/* 步骤区块 */
.guide-steps {
  margin-bottom: 48px;
}

.guide-steps .section-title {
  margin-bottom: 8px;
}

.guide-steps .section-intro {
  margin-bottom: 24px;
}

/* 核验列表 */
.verify-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.verify-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  position: relative;
}

.verify-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

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

/* 步骤网格 */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.step-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 50%;
  flex-shrink: 0;
}

.step-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.step-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.65;
}

.step-figure {
  aspect-ratio: 16 / 8;
  border-radius: var(--radius-sm);
  overflow: hidden;
  width: 100%;
  margin-top: 4px;
}

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

/* 问题排查 */
.troubleshoot-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.trouble-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.trouble-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

/* 区块备注 */
.section-note {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-top: 16px;
  background-color: var(--color-accent-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.section-note a {
  color: var(--color-accent-dark);
  font-weight: 500;
}

/* ============================================================
   PAGES / 内容专题页
   ============================================================ */
.topics-intro {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 760px;
}

.topic-grid-section {
  margin-bottom: 48px;
}

.topic-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.topic-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.topic-content > p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
}

.topic-reason {
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  margin-top: 4px;
}

.topic-reason strong {
  color: var(--color-accent-dark);
  font-weight: 500;
  margin-right: 4px;
}

/* 技巧与链接 */
.topics-tips {
  margin-bottom: 48px;
}

.tips-wrapper {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
}

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

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

.tips-links p {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 12px;
}

.tips-links ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tips-links ul li a {
  font-size: 14px;
  color: var(--color-accent-dark);
  display: inline-block;
  padding: 4px 0;
}

.tips-links ul li a:hover {
  color: var(--color-accent);
}

/* 说明区 */
.topics-note {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 8px;
}

.topics-note .section-title {
  font-size: 18px;
  margin-bottom: 12px;
}

.topics-note p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 10px;
}

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

/* ============================================================
   PAGES / 常见问题页
   ============================================================ */
.faq-section {
  margin-bottom: 48px;
}

.faq-section .section-title {
  margin-bottom: 20px;
}

.content-media-inline {
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16 / 8;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 24px;
}

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

.content-media-inline figcaption {
  display: none;
}

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

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

.faq-item[open] {
  border-color: var(--color-accent);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  min-height: 52px;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-muted);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.faq-answer p {
  margin-bottom: 8px;
}

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

.faq-answer a {
  color: var(--color-accent-dark);
  font-weight: 500;
}

/* 反馈区 */
.feedback-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
}

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

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

.feedback-content a {
  color: var(--color-accent-dark);
  font-weight: 500;
}

/* ============================================================
   PAGES / 404 错误页
   ============================================================ */
.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}

.error-section {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

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

.error-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  background-color: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 40px;
  transition: background-color var(--transition-fast);
}

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

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

.error-links a {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 14px;
  color: var(--color-text);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.error-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

/* ============================================================
   FOOTER / 页脚
   ============================================================ */
.footer-about {
  max-width: 260px;
}

.footer-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

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

.footer-heading {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

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

.footer-bottom p {
  font-size: 13px;
}

/* ============================================================
   RESPONSIVE / 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .hero-section {
    gap: 32px;
    padding: 40px 24px;
  }

  .hero-title {
    font-size: 30px;
  }

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

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

  .footer-about {
    grid-column: 1 / -1;
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  /* 页头 */
  .header-inner {
    height: auto;
    min-height: 64px;
    padding: 12px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    border-top: 1px solid var(--color-border);
    margin-top: 8px;
  }

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

  .nav-list li a {
    padding: 12px 8px;
    border-radius: var(--radius-sm);
  }

  /* 首页 Hero */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px;
  }

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

  .hero-media {
    order: -1;
  }

  .hero-figure {
    aspect-ratio: 16 / 9;
  }

  /* 区块 */
  .section-block,
  .feedback-section {
    padding-left: 16px;
    padding-right: 16px;
  }

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

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

  /* 内页 */
  .inner-main {
    padding: 24px 16px 0;
  }

  .page-title {
    font-size: 24px;
  }

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

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

  .summary-layout {
    grid-template-columns: 1fr;
    padding: 20px;
  }

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

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

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

  .tips-wrapper {
    grid-template-columns: 1fr;
    padding: 20px;
  }

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

  .footer-bottom {
    padding: 12px 16px 16px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .channel-tags-list {
    gap: 8px;
  }

  .channel-tag {
    padding: 8px 16px;
    font-size: 13px;
  }

  .topic-body,
  .topic-content {
    padding: 16px;
  }

  .guide-entry-card {
    padding: 20px;
  }

  .feedback-inner {
    padding: 24px 20px;
  }

  .related-links-section,
  .topics-note,
  .feedback-content {
    padding: 20px;
  }

  .category-detail-item,
  .verify-item,
  .trouble-item {
    padding: 16px 20px;
  }

  .step-card {
    padding: 20px;
  }

  .faq-question {
    padding: 14px 16px;
    font-size: 14px;
  }

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

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

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

  .error-links {
    flex-direction: column;
    align-items: center;
  }

  .error-links a {
    width: 100%;
    justify-content: center;
  }
}