/* ==========================================================================
   红果影视 · 全站样式表
   版本：1.0
   说明：本样式表服务于 029xatjz.cn 全站，覆盖首页、内页、404 页。
   结构：base → layout → components → pages → responsive
   ========================================================================== */

/* ==========================================================================
   Base — 基础变量、重置与全局默认
   ========================================================================== */

:root {
  --color-primary: #1F3A5F;
  --color-accent: #D97706;
  --color-bg: #F7F5F0;
  --color-text: #2B2B2B;
  --color-border: #E5E0D6;
  --color-white: #FFFFFF;
  --color-muted: #6B7280;
  --color-primary-soft: #E8EEF5;
  --color-accent-soft: #FDF3E7;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", Consolas, "Liberation Mono", Menlo,
    monospace;

  --container-width: 1140px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  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;
}

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

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

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

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

h1 {
  font-size: 36px;
}

h2 {
  font-size: 26px;
}

h3 {
  font-size: 19px;
}

/* 等宽数字 */
.issue-label,
.step-number,
.timeline-number,
.update-date,
.month-title,
.year-title,
.ranking-item::before {
  font-family: var(--font-mono);
}

/* 视觉隐藏（仅用于可访问性） */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

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

/* 站点整体 */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* 页头 */
.site-header {
  background-color: var(--color-white);
  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 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

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

.nav-toggle {
  display: none;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-list li {
  list-style: none;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

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

/* 主内容区 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 48px;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 56px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 12px;
}

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

/* 页头标题区（内页统一） */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 34px;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 720px;
  line-height: 1.7;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 16px 0;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 14px;
  color: var(--color-muted);
}

.footer-brand {
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: var(--color-muted);
  font-size: 13px;
}

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

.footer-note {
  margin: 0;
  font-size: 13px;
}

/* 通用布局容器 */
.layout-shell {
  display: grid;
  gap: 32px;
}

/* 侧栏在左 */
.sidebar-left {
  grid-template-columns: 240px 1fr;
  align-items: start;
}

/* 侧栏在右 */
.sidebar-right {
  grid-template-columns: 1fr 260px;
  align-items: start;
}

/* 反馈页布局 */
.layout-shell .layout-main {
  min-width: 0;
}

.layout-shell .layout-aside {
  min-width: 0;
}

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

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, transform 0.1s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  background-color: #162A47;
  color: var(--color-white);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

/* 区块标题与说明 */
.section-desc {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: 20px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-primary);
}

/* 更多链接 */
.more-link {
  margin-top: 20px;
  font-size: 15px;
}

.more-link a {
  color: var(--color-accent);
  font-weight: 600;
}

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

/* 锚点列表（频道分类、步骤目录共用） */
.anchor-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.anchor-list li {
  margin-bottom: 4px;
}

.anchor-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.anchor-list a:hover {
  background-color: var(--color-primary-soft);
  border-left-color: var(--color-accent);
  color: var(--color-primary);
}

/* 文本链接 */
.text-link {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* 正文段落 */
p {
  margin-bottom: 12px;
}

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

/* 杂志封面首屏 */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
}

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

.issue-label {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.hero-intro {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 480px;
}

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

.hero-media {
  min-width: 0;
}

.hero-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-soft);
}

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

/* 频道导航目录 */
.channel-menu {
  padding: 48px 0 8px;
}

.channel-menu h2 {
  font-size: 26px;
  margin-bottom: 8px;
}

.channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.channel-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.channel-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(31, 58, 95, 0.08);
}

.channel-link {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

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

.channel-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* 专题片单榜单 */
.playlist-ranking {
  padding: 40px 0 8px;
}

.playlist-ranking h2 {
  font-size: 26px;
  margin-bottom: 8px;
}

.ranking-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: ranking;
}

.ranking-item {
  counter-increment: ranking;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.ranking-item::before {
  content: "0" counter(ranking);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  position: absolute;
  margin-left: -40px;
  margin-top: 8px;
}

.ranking-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-primary-soft);
}

.ranking-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

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

.ranking-info h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.ranking-summary {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.ranking-info a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.ranking-info a:hover {
  text-decoration: underline;
}

/* 观看指南步骤摘要 */
.guide-steps {
  padding: 40px 0 8px;
}

.guide-steps h2 {
  font-size: 26px;
  margin-bottom: 8px;
}

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

.step-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  position: relative;
  transition: border-color 0.2s ease;
}

.step-item:hover {
  border-color: var(--color-accent);
}

.step-number {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

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

.step-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.step-item a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.step-item a:hover {
  text-decoration: underline;
}

/* 更新摘要 */
.update-summary {
  padding: 40px 0 8px;
}

.update-summary h2 {
  font-size: 26px;
  margin-bottom: 8px;
}

.update-entry {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 24px;
}

.update-date {
  display: inline-block;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.update-entry h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.update-entry p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.update-entry a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.update-entry a:hover {
  text-decoration: underline;
}

/* 规则与反馈 */
.rules-feedback {
  padding: 48px 0 16px;
}

.rules-feedback h2 {
  font-size: 26px;
  margin-bottom: 8px;
}

.rules-content {
  max-width: 780px;
}

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

.btn-feedback {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  margin-top: 12px;
}

.btn-feedback:hover {
  background-color: #162A47;
  color: var(--color-white);
}

/* ==========================================================================
   Pages — 频道导航（channels.html）
   ========================================================================== */

.page-figure {
  margin: 0 0 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-soft);
}

.page-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.page-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.channel-anchor {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

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

.channel-list {
  min-width: 0;
}

.channel-group {
  margin-bottom: 40px;
}

.group-title {
  font-size: 22px;
  font-weight: 700;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  margin-bottom: 20px;
}

.channel-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
}

.channel-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}

.channel-tags {
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.channel-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

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

.channel-note {
  margin-top: 16px;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.note-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.channel-note p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
}

.channel-note a {
  font-weight: 600;
  color: var(--color-accent);
}

/* ==========================================================================
   Pages — 专题片单（playlists.html）
   ========================================================================== */

.sort-control {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
  padding: 16px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

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

.sort-select {
  font-size: 14px;
  font-family: var(--font-sans);
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
}

.sort-hint {
  font-size: 13px;
  color: var(--color-muted);
}

/* 片单网格 */
.playlist-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 40px;
}

.playlist-grid .section-title {
  grid-column: 1 / -1;
}

.playlist-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  min-width: 0;
}

.playlist-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(31, 58, 95, 0.08);
}

.playlist-cover {
  margin: 0;
  background-color: var(--color-primary-soft);
  overflow: hidden;
}

.playlist-cover img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.playlist-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1 0 auto;
}

.playlist-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.playlist-summary {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.playlist-meta {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.meta-label {
  font-weight: 600;
  color: var(--color-text);
  margin-right: 6px;
}

.playlist-meta a {
  color: var(--color-primary);
  font-weight: 500;
}

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

.playlist-updated {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.playlist-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  align-self: flex-start;
}

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

/* 片单说明 */
.playlist-notes {
  padding: 32px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 32px;
}

.playlist-notes .section-title {
  margin-bottom: 16px;
}

.notes-text {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

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

/* 相关链接 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 16px 20px;
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-md);
}

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

.related-links-item {
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 500;
}

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

/* ==========================================================================
   Pages — 观看指南（guide.html）
   ========================================================================== */

.current-step {
  margin-bottom: 40px;
}

.step-status-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.step-status-label {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-status-label strong {
  color: var(--color-accent);
  font-size: 17px;
}

.step-status-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.step-status-card a {
  color: var(--color-accent);
  font-weight: 600;
}

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

.step-meta strong {
  color: var(--color-text);
  font-weight: 600;
}

/* 时间轴 */
.timeline {
  margin-bottom: 40px;
}

.timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: 56px;
  padding-bottom: 28px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: 50%;
  z-index: 1;
}

.timeline-item:nth-child(2) .timeline-number {
  background-color: var(--color-accent);
}

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

.timeline-content h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.timeline-content p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 6px;
}

.timeline-content a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.timeline-content a:hover {
  text-decoration: underline;
}

/* 观看示意图 */
.guide-media {
  margin: 0 0 40px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-soft);
}

.guide-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.guide-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

/* 步骤目录 */
.step-directory {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

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

/* ==========================================================================
   Pages — 更新归档（timeline.html）
   ========================================================================== */

.year-jump {
  margin-bottom: 40px;
}

.year-jump .section-title {
  font-size: 20px;
}

.year-jump-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.year-jump-list li {
  margin: 0;
}

.year-jump-list a {
  display: inline-block;
  padding: 8px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.year-jump-list a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.month-groups {
  margin-bottom: 40px;
}

.year-block {
  margin-bottom: 40px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.year-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-accent);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  margin-bottom: 20px;
}

.month-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: border-color 0.2s ease;
}

.month-block:hover {
  border-color: var(--color-accent);
}

.month-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.month-summary {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}

.month-block a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.month-block a:hover {
  text-decoration: underline;
}

/* 归档缩略图 */
.archive-figure {
  margin: 32px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-soft);
}

.archive-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.archive-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

/* 归档说明 */
.archive-note {
  padding: 24px 28px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.archive-note .section-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.archive-note p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ==========================================================================
   Pages — 入口核验（verify.html）
   ========================================================================== */

.verify-figure {
  margin: 0 0 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-soft);
}

.verify-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.verify-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

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

.rules-list > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.rules-list > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.rule-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
}

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

.rule-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.rule-example {
  font-size: 13px;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

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

.process-steps > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.process-steps > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: process;
}

.process-list li {
  counter-increment: process;
  position: relative;
  padding: 20px 24px 20px 72px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.process-list li::before {
  content: counter(process);
  position: absolute;
  left: 20px;
  top: 20px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-accent);
  border-radius: 50%;
}

.process-list h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.process-list p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

.feedback-entry {
  padding: 24px 28px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.feedback-entry h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feedback-entry p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* ==========================================================================
   Pages — 问题反馈（feedback.html）
   ========================================================================== */

.page-header-media {
  margin: 20px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-soft);
}

.page-header-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.feedback-scope {
  margin-bottom: 40px;
}

.feedback-scope > h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.feedback-scope > p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.feedback-scope h3 {
  font-size: 18px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.scope-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
}

.scope-list li {
  position: relative;
  padding: 10px 16px 10px 36px;
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.scope-list li::before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 10px;
  color: var(--color-accent);
  font-weight: 700;
}

.scope-list-exclude li::before {
  content: "✕";
  color: #B91C1C;
}

.checklist {
  padding: 24px 28px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

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

.checklist > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 20px;
}

.checklist-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: checklist;
}

.checklist-steps li {
  counter-increment: checklist;
  position: relative;
  padding: 16px 16px 16px 56px;
  border-top: 1px solid var(--color-border);
}

.checklist-steps li:first-child {
  border-top: none;
}

.checklist-steps li::before {
  content: counter(checklist);
  position: absolute;
  left: 0;
  top: 16px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
  border-radius: 50%;
}

.checklist-steps h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.checklist-steps p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 侧边卡片 */
.aside-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  margin-bottom: 16px;
}

.aside-card h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.aside-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.aside-links li {
  margin-bottom: 4px;
}

.aside-links a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.aside-links a:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.aside-links span {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  padding: 0 12px 8px;
}

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
}

.error-section {
  max-width: 560px;
  text-align: center;
  padding: 48px 40px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
}

.error-help {
  font-size: 14px;
  color: var(--color-muted);
}

/* ==========================================================================
   Responsive — 响应式断点
   ========================================================================== */

/* 平板及以下 */
@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-media {
    order: -1;
  }

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

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

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

  .sidebar-left,
  .sidebar-right {
    grid-template-columns: 1fr;
  }

  .channel-anchor,
  .step-directory {
    position: static;
    margin-bottom: 24px;
  }

  .channel-anchor {
    order: 2;
  }

  .layout-shell .layout-aside {
    margin-top: 0;
  }

  /* 移动端顺序：主内容在前，侧栏在后 */
  .sidebar-left .channel-anchor {
    order: 2;
  }

  .sidebar-left .channel-list {
    order: 1;
  }

  .sidebar-right .step-directory {
    order: 2;
  }

  .sidebar-right .timeline {
    order: 1;
  }
}

/* 手机端 */
@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  /* 页头 */
  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .brand-name {
    font-size: 19px;
  }

  /* 移动导航 */
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
  }

  .nav-toggle-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 1px;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

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

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

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

  .site-nav {
    position: relative;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    padding: 8px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    z-index: 200;
  }

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

  .nav-list a {
    padding: 12px 16px;
    font-size: 15px;
  }

  .nav-list a.is-current {
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
  }

  /* 主内容 */
  .home-main,
  .inner-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
  }

  .page-title {
    font-size: 28px;
  }

  .page-description {
    font-size: 15px;
  }

  /* 面包屑 */
  .breadcrumb {
    font-size: 13px;
    margin-bottom: 16px;
  }

  /* 首页 */
  .hero {
    padding: 32px 0 24px;
  }

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

  .hero-intro {
    font-size: 15px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    padding: 12px 20px;
    min-height: 44px;
  }

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

  .channel-item {
    flex-direction: column;
    gap: 4px;
    padding: 12px 14px;
  }

  .ranking-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 16px 0;
  }

  .ranking-item::before {
    display: none;
  }

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

  .update-entry {
    padding: 16px;
  }

  .rules-feedback {
    padding: 32px 0 8px;
  }

  /* 频道导航 */
  .channel-card {
    padding: 16px;
  }

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

  .channel-note {
    padding: 16px;
  }

  /* 专题片单 */
  .sort-control {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 12px 16px;
  }

  .sort-select {
    width: 100%;
    min-height: 44px;
  }

  .playlist-body {
    padding: 16px;
  }

  .playlist-notes {
    padding: 20px 16px;
  }

  .related-links {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 16px;
  }

  /* 观看指南 */
  .step-status-card {
    padding: 16px;
  }

  .timeline-item {
    padding-left: 48px;
  }

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

  .timeline-list::before {
    left: 17px;
  }

  /* 更新归档 */
  .year-jump-list {
    gap: 6px;
  }

  .year-jump-list a {
    padding: 8px 14px;
    font-size: 14px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .month-block {
    padding: 16px;
  }

  .archive-note {
    padding: 16px;
  }

  /* 入口核验 */
  .rule-item {
    padding: 16px;
  }

  .process-list li {
    padding: 16px 16px 16px 60px;
  }

  .process-list li::before {
    left: 16px;
    top: 16px;
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .feedback-entry {
    padding: 16px;
  }

  /* 问题反馈 */
  .checklist {
    padding: 16px;
  }

  .checklist-steps li {
    padding: 14px 14px 14px 48px;
  }

  .checklist-steps li::before {
    left: 0;
    top: 14px;
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .scope-list li {
    padding: 10px 14px 10px 32px;
  }

  .scope-list li::before {
    left: 12px;
    top: 10px;
  }

  /* 页脚 */
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 0 16px;
  }

  .footer-links {
    gap: 4px 12px;
  }

  /* 404 */
  .error-section {
    padding: 32px 20px;
  }

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

  .error-actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* 小屏手机 */
@media (max-width: 380px) {
  .brand-name {
    font-size: 17px;
  }

  .hero h1 {
    font-size: 24px;
  }

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