/* ==========================================================================
   红果影视 - 全站样式表
   设计风格：几何编辑风 / 矩形分区 / 红黑黄蓝配色
   ========================================================================== */

/* --------------------------------------------------------------------------
   Base - 基础重置与全局变量
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #D9251C;
  --color-accent: #FFC845;
  --color-secondary: #2E6F95;
  --color-text: #22262A;
  --color-bg: #FFFFFF;
  --color-bg-light: #F4F5F7;
  --color-footer-bg: #1F2328;
  --color-footer-text: #E8EAED;
  --color-border: #D9DCE0;
  --color-border-strong: #A0A6AD;
  --font-sans: -apple-system, 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Consolas, 'Liberation Mono', monospace;
  --content-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

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

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

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

a:hover,
a:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

strong {
  font-weight: 700;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Layout - 全站骨架布局
   -------------------------------------------------------------------------- */

/* 站点主容器 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

/* 首页主容器 */
.home-main {
  background-color: var(--color-bg);
}

/* 内页主容器 */
.inner-main {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 内页通用两栏布局（侧栏在左） */
.layout-shell.sidebar-left {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  margin-top: 8px;
}

/* --------------------------------------------------------------------------
   Header - 页头与导航（全站统一）
   -------------------------------------------------------------------------- */

.site-header {
  background-color: var(--color-bg);
  border-bottom: 3px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-shell {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* 品牌字标 */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--color-text);
}

.brand-logo:hover,
.brand-logo:focus-visible {
  text-decoration: none;
  color: var(--color-text);
}

.brand-mark {
  display: inline-block;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 32px;
  text-align: center;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 20px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-list a.is-current {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 700;
}

/* 汉堡按钮（移动端显示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-bg);
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* --------------------------------------------------------------------------
   Breadcrumb - 面包屑（内页统一）
   -------------------------------------------------------------------------- */

.breadcrumb {
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--color-border-strong);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumb a {
  color: var(--color-secondary);
  text-decoration: none;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
}

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

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

/* --------------------------------------------------------------------------
   Page Header - 内页标题区（全站内页统一）
   -------------------------------------------------------------------------- */

.page-header {
  padding: 28px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-description {
  font-size: 1rem;
  color: #555B61;
  max-width: 720px;
}

/* --------------------------------------------------------------------------
   Footer - 页脚（全站统一深色三列）
   -------------------------------------------------------------------------- */

.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  margin-top: auto;
}

.footer-shell {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 48px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-bg);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-bg);
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--color-footer-text);
  line-height: 1.6;
  opacity: 0.8;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--color-footer-text);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
}

.footer-boundary p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-footer-text);
  opacity: 0.8;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-footer-text);
  opacity: 0.6;
}

/* --------------------------------------------------------------------------
   Components - 通用组件
   -------------------------------------------------------------------------- */

/* 区块标题 */
.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
  position: relative;
  padding-left: 14px;
  line-height: 1.4;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

/* 按钮 */
.act-btn,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  border: 2px solid transparent;
}

.act-btn:hover,
.act-btn:focus-visible,
.btn:hover,
.btn:focus-visible {
  text-decoration: none;
  transform: translateY(-1px);
}

.act-primary,
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

.act-primary:hover,
.act-primary:focus-visible,
.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: #B51E16;
  border-color: #B51E16;
  color: var(--color-bg);
}

.act-secondary {
  background-color: var(--color-bg);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.act-secondary:hover,
.act-secondary:focus-visible {
  background-color: var(--color-primary);
  color: var(--color-bg);
}

.act-outline {
  background-color: transparent;
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.act-outline:hover,
.act-outline:focus-visible {
  background-color: var(--color-accent);
  color: var(--color-text);
  border-color: var(--color-accent);
}

.btn-quiet {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-quiet:hover,
.btn-quiet:focus-visible {
  background-color: var(--color-secondary);
  color: var(--color-bg);
  border-color: var(--color-secondary);
}

/* 内容图片（内页通用） */
.content-media {
  margin: 0 0 24px;
}

.content-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.content-media figcaption {
  font-size: 13px;
  color: #666C72;
  padding: 8px 4px 0;
  text-align: center;
}

.content-media-inline {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

/* 相关链接条 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 0;
  margin-top: 32px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-right: 4px;
}

.related-links-item {
  font-size: 14px;
  color: var(--color-secondary);
  text-decoration: none;
  padding: 6px 12px;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.related-links-item:hover,
.related-links-item:focus-visible {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: var(--color-bg);
  text-decoration: none;
}

/* 步骤编号（通用） */
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Components - 首页专属组件
   -------------------------------------------------------------------------- */

/* 首屏焦点区 */
.hero-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 56px 24px 48px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-text);
  margin-bottom: 0;
}

.hero-subtitle {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: #555B61;
  max-width: 520px;
  margin-bottom: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}

.hero-figure {
  margin: 0;
}

.hero-figure img {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

/* 频道标签栏 */
.channel-tags {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 40px 24px;
}

.tag-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.tag-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 12px 16px;
  background-color: var(--color-bg-light);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
  text-align: center;
}

.tag-item:hover,
.tag-item:focus-visible {
  background-color: var(--color-accent);
  border-color: var(--color-primary);
  color: var(--color-text);
  text-decoration: none;
  transform: translateY(-2px);
}

/* 热门专题预览 */
.featured-collections {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 40px 24px;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.collection-card:hover,
.collection-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.collection-media {
  margin: 0;
  overflow: hidden;
  background-color: var(--color-bg-light);
}

.collection-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.collection-card:hover .collection-media img {
  transform: scale(1.03);
}

.collection-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.card-heading {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

.card-desc {
  font-size: 14px;
  color: #555B61;
  line-height: 1.6;
  flex: 1;
}

.card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  align-self: flex-start;
}

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

/* 观看指南摘要 */
.guide-preview {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 40px 24px;
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.step-strip {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background-color: var(--color-bg);
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.step-item .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.step-content {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.step-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

.step-desc {
  font-size: 14px;
  color: #555B61;
  line-height: 1.5;
}

.guide-full-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  padding: 8px 0;
}

.guide-full-link:hover,
.guide-full-link:focus-visible {
  text-decoration: underline;
}

/* 最新更新动态 */
.update-list {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 40px 24px;
}

.update-preview-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.update-mini {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 16px 20px;
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.update-mini:hover {
  border-color: var(--color-secondary);
  background-color: var(--color-bg);
}

.version-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-secondary);
  background-color: rgba(46, 111, 149, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.update-summary {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.5;
}

.update-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
  text-decoration: none;
  white-space: nowrap;
}

.update-link:hover,
.update-link:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
}

/* 内容说明与反馈入口 */
.info-feedback {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  background-color: var(--color-bg);
}

.info-block p {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
  max-width: 520px;
}

.feedback-entry {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding: 32px;
  background-color: var(--color-footer-bg);
  border-radius: var(--radius-md);
}

.feedback-text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-footer-text);
}

/* --------------------------------------------------------------------------
   Components - 频道导航页（channels）
   -------------------------------------------------------------------------- */

/* 类型筛选侧栏 */
.type-anchors {
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: 88px;
}

.aside-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
}

.anchor-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.anchor-list a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: all var(--transition-fast);
}

.anchor-list a:hover,
.anchor-list a:focus-visible {
  background-color: var(--color-bg);
  border-left-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

/* 频道行列表 */
.channel-list-area {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.channel-row {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.channel-row:hover,
.channel-row:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.channel-media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-light);
}

.channel-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.channel-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.channel-name {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.channel-desc {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
}

.channel-audience {
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-bg-light);
  padding: 10px 14px;
  border-left: 3px solid var(--color-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.channel-audience strong {
  color: var(--color-secondary);
}

.channel-related {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.channel-related a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.channel-related a:hover,
.channel-related a:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

/* 信任提示 */
.trust-note {
  margin-top: 32px;
  padding: 20px 24px;
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-secondary);
  border-radius: var(--radius-sm);
}

.trust-note p {
  font-size: 14px;
  line-height: 1.6;
  color: #555B61;
}

/* --------------------------------------------------------------------------
   Components - 专题片单页（collections）
   -------------------------------------------------------------------------- */

.collection-intro {
  margin-bottom: 40px;
}

.collection-intro p {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
  max-width: 760px;
  margin-bottom: 12px;
}

.collection-cards {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-bottom: 40px;
}

.collection-card-left,
.collection-card-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.collection-card-left:hover,
.collection-card-right:hover,
.collection-card-left:focus-within,
.collection-card-right:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}

.collection-card-media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-light);
}

.collection-card-media figure {
  margin: 0;
}

.collection-card-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.collection-card-left:hover .collection-card-media img,
.collection-card-right:hover .collection-card-media img {
  transform: scale(1.02);
}

.collection-card-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.collection-card-body h3 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.collection-card-desc {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
}

.collection-direction {
  background-color: var(--color-bg-light);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
}

.collection-direction h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 8px;
}

.collection-direction ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.collection-direction li {
  font-size: 14px;
  color: var(--color-text);
  position: relative;
  padding-left: 18px;
}

.collection-direction li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.collection-audience {
  font-size: 14px;
  color: var(--color-text);
  padding: 10px 14px;
  border-left: 3px solid var(--color-primary);
  background-color: rgba(217, 37, 28, 0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.collection-audience strong {
  color: var(--color-primary);
}

.collection-related {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 4px;
}

.collection-related a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.collection-related a:hover,
.collection-related a:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

/* 关联导航提示 */
.related-note {
  margin-top: 24px;
  padding: 28px;
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.related-note p {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
  margin-bottom: 8px;
}

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

.related-note a {
  color: var(--color-secondary);
  font-weight: 600;
}

.related-note a:hover,
.related-note a:focus-visible {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Components - 观看指南页（guides）
   -------------------------------------------------------------------------- */

/* 步骤导航侧栏 */
.guide-sidebar {
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: 88px;
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
}

.step-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.step-nav-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: all var(--transition-fast);
}

.step-nav-list a:hover,
.step-nav-list a:focus-visible {
  background-color: var(--color-bg);
  border-left-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

/* 主步骤区 */
.guide-content {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.guide-step {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  scroll-margin-top: 88px;
}

.step-heading {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-accent);
}

.step-heading .step-number {
  width: 40px;
  height: 40px;
  font-size: 18px;
}

.step-heading .step-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.step-task {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  background-color: var(--color-bg-light);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--color-secondary);
}

.guide-step > p {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
  margin-bottom: 20px;
}

/* 示例结果块 */
.example-block {
  margin: 24px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.example-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  background-color: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
}

.example-head h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.example-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  background-color: var(--color-secondary);
  color: var(--color-bg);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.example-toggle:hover,
.example-toggle:focus-visible {
  background-color: var(--color-primary);
}

.example-toggle[aria-expanded="true"] {
  background-color: var(--color-primary);
}

.example-content {
  padding: 20px;
  background-color: var(--color-bg);
}

.example-content[hidden] {
  display: none;
}

.example-figure {
  margin: 0 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.example-content p {
  font-size: 14px;
  line-height: 1.6;
  color: #555B61;
}

/* 检查提示 */
.check-tip {
  margin-top: 24px;
  padding: 20px;
  background-color: rgba(255, 200, 69, 0.08);
  border: 1px solid rgba(255, 200, 69, 0.4);
  border-radius: var(--radius-md);
}

.check-tip h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.check-tip h3::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background-color: var(--color-accent);
  color: var(--color-text);
  font-size: 12px;
  font-weight: 700;
  border-radius: 50%;
}

.check-tip ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.check-tip li {
  font-size: 14px;
  line-height: 1.6;
  color: #555B61;
  padding-left: 16px;
  position: relative;
}

.check-tip li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

/* 相关入口 */
.related-entry {
  margin-top: 32px;
  padding: 24px;
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.related-entry p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
}

.related-entry a {
  font-weight: 600;
  color: var(--color-secondary);
  margin-right: 8px;
}

.related-entry a:hover,
.related-entry a:focus-visible {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Components - 更新动态页（updates）
   -------------------------------------------------------------------------- */

.updates-content {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.version-timeline {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.version-timeline > h2,
.change-note h2,
.impact-guide h2,
.related-links h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
  padding-left: 14px;
  position: relative;
}

.version-timeline > h2::before,
.change-note h2::before,
.impact-guide h2::before,
.related-links h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.version-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--transition-base);
}

.version-item:hover,
.version-item:focus-within {
  border-color: var(--color-secondary);
}

.version-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.version-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-bg);
  background-color: var(--color-primary);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.version-label {
  font-size: 13px;
  color: var(--color-border-strong);
  font-family: var(--font-mono);
}

.version-item h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

.version-item > p {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
}

.version-impact {
  background-color: var(--color-bg-light);
  border-left: 4px solid var(--color-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.version-impact p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
}

.version-impact strong {
  color: var(--color-secondary);
}

/* 变更说明 */
.change-note {
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.change-note p {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
  margin-bottom: 12px;
}

.change-note strong {
  color: var(--color-text);
  background-color: var(--color-accent);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}

/* 影响引导 */
.impact-guide {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.impact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.impact-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.impact-card:hover,
.impact-card:focus-within {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.impact-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
}

.impact-card p {
  font-size: 14px;
  line-height: 1.6;
  color: #555B61;
}

/* 相关链接 */
.related-links ul {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.related-links a {
  display: block;
  padding: 12px 16px;
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.related-links a:hover,
.related-links a:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-bg);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Components - 意见反馈页（feedback）
   -------------------------------------------------------------------------- */

.feedback-types-section,
.feedback-process-section,
.faq-section,
.update-application-section {
  margin-bottom: 48px;
}

.feedback-types-section h2,
.feedback-process-section h2,
.faq-section h2,
.update-application-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-left: 14px;
  position: relative;
}

.feedback-types-section h2::before,
.feedback-process-section h2::before,
.faq-section h2::before,
.update-application-section h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.section-lead {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
  margin-bottom: 24px;
  max-width: 760px;
}

/* 反馈类型网格 */
.feedback-type-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feedback-type-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.feedback-type-card:hover,
.feedback-type-card:focus-within {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.feedback-type-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.feedback-type-card p {
  font-size: 14px;
  line-height: 1.6;
  color: #555B61;
}

/* 处理流程 */
.process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

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

.process-step .step-number {
  width: 36px;
  height: 36px;
  font-size: 16px;
}

.process-step h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

.process-step p {
  font-size: 14px;
  line-height: 1.6;
  color: #555B61;
}

.process-note {
  background-color: rgba(46, 111, 149, 0.06);
  border-left: 4px solid var(--color-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
}

.process-note p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
}

/* FAQ 折叠面板 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-item:hover,
.faq-item:focus-within {
  border-color: var(--color-secondary);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast);
}

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

.faq-item summary::after {
  content: '+';
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-secondary);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item[open] summary {
  color: var(--color-primary);
}

.faq-item[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-item summary:hover,
.faq-item summary:focus-visible {
  color: var(--color-primary);
}

.faq-item > p {
  padding: 0 24px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: #555B61;
}

/* 更新应用说明 */
.update-application-section {
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.update-application-section p {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
  margin-bottom: 12px;
}

.update-application-section a {
  font-weight: 600;
  color: var(--color-secondary);
}

.update-application-section a:hover,
.update-application-section a:focus-visible {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Components - 关于本站页（about）
   -------------------------------------------------------------------------- */

.about-intro,
.about-scope,
.about-boundaries,
.about-structure {
  margin-bottom: 48px;
  max-width: 760px;
}

.about-intro h2,
.about-scope h2,
.about-boundaries h2,
.about-structure h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-left: 14px;
  position: relative;
}

.about-intro h2::before,
.about-scope h2::before,
.about-boundaries h2::before,
.about-structure h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.about-intro p,
.about-scope p,
.about-boundaries p,
.about-structure p {
  font-size: 15px;
  line-height: 1.8;
  color: #555B61;
  margin-bottom: 16px;
}

.scope-list,
.boundary-list {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scope-list li,
.boundary-list li {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text);
  padding: 10px 16px;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-secondary);
}

.boundary-list li {
  border-left-color: var(--color-primary);
}

/* 栏目结构图 */
.structure-figure {
  margin: 24px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-bg-light);
}

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

.structure-figure figcaption {
  padding: 12px 16px;
  font-size: 14px;
  color: #555B61;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

/* 栏目导览卡片 */
.guide-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.guide-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.guide-card:hover,
.guide-card:focus-visible {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  text-decoration: none;
}

.guide-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
}

.guide-card p {
  font-size: 13px;
  line-height: 1.5;
  color: #555B61;
  margin: 0;
}

/* --------------------------------------------------------------------------
   Pages - 404 错误页
   -------------------------------------------------------------------------- */

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

.error-shell {
  max-width: 560px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  border: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 16px 32px;
  display: inline-block;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.error-desc {
  font-size: 15px;
  line-height: 1.7;
  color: #555B61;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: 8px;
}

.error-help {
  font-size: 14px;
  color: #555B61;
  margin-top: 16px;
}

.error-help a {
  color: var(--color-secondary);
  font-weight: 600;
}

.error-help a:hover,
.error-help a:focus-visible {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Responsive - 响应式规则
   -------------------------------------------------------------------------- */

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

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

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

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

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

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

  .hero-panel {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 24px;
  }

  .hero-figure {
    max-width: 640px;
  }

  .channel-row {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 20px;
  }

  .collection-card-left,
  .collection-card-right {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .collection-card-media img {
    height: 200px;
  }

  .layout-shell.sidebar-left {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 24px;
  }
}

/* 手机端 */
@media (max-width: 768px) {
  .header-shell {
    min-height: 56px;
    padding: 0 16px;
    flex-wrap: wrap;
  }

  .brand-logo {
    padding: 8px 0;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    width: 100%;
    order: 3;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: 8px 0 16px;
  }

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

  .nav-list a {
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
    border-left: 3px solid transparent;
    font-size: 16px;
  }

  .nav-list a.is-current {
    border-left-color: var(--color-primary);
    background-color: rgba(217, 37, 28, 0.04);
  }

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

  /* 内页 */
  .inner-main {
    padding: 0 16px 48px;
  }

  .breadcrumb {
    padding-top: 16px;
  }

  .page-header {
    padding: 24px 0 20px;
    margin-bottom: 24px;
  }

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

  /* 内页两栏改单栏 */
  .layout-shell.sidebar-left {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .type-anchors,
  .guide-sidebar {
    position: static;
    order: 2;
    width: 100%;
  }

  .channel-list-area,
  .guide-content {
    order: 1;
    width: 100%;
  }

  .anchor-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .anchor-list li {
    flex: 0 0 auto;
  }

  .anchor-list a {
    border-left: none;
    border-bottom: 3px solid transparent;
    border-radius: var(--radius-sm);
    padding: 8px 12px;
  }

  .anchor-list a:hover,
  .anchor-list a:focus-visible {
    border-left: none;
    border-bottom-color: var(--color-primary);
  }

  /* 首页模块 */
  .hero-panel {
    padding: 32px 16px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

  .channel-tags,
  .featured-collections,
  .guide-preview,
  .update-list,
  .info-feedback {
    padding: 32px 16px;
  }

  .tag-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

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

  .step-strip {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .update-mini {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .version-tag {
    justify-self: start;
  }

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

  /* 频道行 */
  .channel-row {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
  }

  .channel-media img {
    height: 160px;
  }

  /* 专题卡片 */
  .collection-card-left,
  .collection-card-right {
    padding: 16px;
  }

  .collection-card-media img {
    height: 180px;
  }

  /* 指南步骤 */
  .guide-step {
    padding: 20px;
  }

  .step-heading {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .example-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .example-toggle {
    width: 100%;
  }

  /* 更新动态 */
  .version-item {
    padding: 20px;
  }

  .version-meta {
    flex-wrap: wrap;
  }

  .impact-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  /* 反馈 */
  .feedback-type-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 关于 */
  .guide-cards {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 页脚 */
  .footer-shell {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .footer-boundary {
    grid-column: auto;
  }

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

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

  .error-code {
    font-size: 3.5rem;
    padding: 12px 24px;
  }

  .error-actions {
    flex-direction: column;
    width: 100%;
  }

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

/* 小屏手机 */
@media (max-width: 420px) {
  .tag-row {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .tag-item {
    min-height: 48px;
    padding: 8px 12px;
    font-size: 14px;
  }

  .collection-media img {
    height: 160px;
  }

  .step-item {
    padding: 16px;
  }

  .update-mini {
    padding: 14px 16px;
  }

  .feedback-type-card {
    padding: 20px 16px;
  }

  .process-step {
    padding: 20px 16px;
  }

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

  .faq-item > p {
    padding: 0 16px 14px;
  }
}