/* ==========================================================================
   糖心vlog免费网站 - 全站样式表
   版本: 1.0
   说明: 覆盖首页、全部内页与404页的完整视觉系统
   ========================================================================== */

/* ==========================================================================
   01. Base - 基础变量、重置与全局元素
   ========================================================================== */

:root {
  /* 色彩系统 */
  --color-bg: #faf6f2;
  --color-text: #2b211c;
  --color-accent: #e8703a;
  --color-accent-light: #f7e3d3;
  --color-card: #ffffff;
  --color-muted: #8a6a5a;
  --color-border: #eadfd6;
  --color-text-light: #6b5a50;

  /* 布局 */
  --container-width: 1200px;
  --container-padding: 24px;
  --section-gap: 64px;
  --card-radius: 8px;

  /* 字体 */
  --font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-size-body: 16px;
  --font-size-small: 13px;
  --font-size-tag: 12px;
  --line-height-body: 1.7;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;

  /* 阴影 */
  --shadow-card: 0 2px 8px rgba(43, 33, 28, 0.06);
  --shadow-hover: 0 6px 20px rgba(232, 112, 58, 0.12);
}

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

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

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

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

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

a:hover {
  color: #d05a26;
}

ul,
ol {
  list-style: none;
}

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

/* 通用容器 */
.site-main {
  flex: 1 0 auto;
}

/* ==========================================================================
   02. Layout - 页头、页脚、主体容器与网格系统
   ========================================================================== */

/* ---------- 页头 ---------- */

.site-header {
  background-color: var(--color-card);
  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 var(--container-padding);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

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

.brand-name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  margin-right: 8px;
  vertical-align: 2px;
}

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

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-text-light);
  border-radius: 6px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  line-height: 1.5;
}

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

.nav-list li a.is-current {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  font-weight: 600;
}

/* 汉堡菜单按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
  padding: 0;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ---------- 页脚 ---------- */

.site-footer {
  background-color: #f0e8e1;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-padding) 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 16px var(--container-padding);
  text-align: center;
}

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

/* ---------- 内页主体骨架 ---------- */

.site-main.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding) 64px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 4px;
  font-size: 14px;
  color: var(--color-muted);
}

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

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

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

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

/* 页面标题区 */
.page-header {
  padding: 24px 0 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: 12px;
}

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

/* 通用区块标题 */
.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.35;
}

.section-desc {
  font-size: 15px;
  color: var(--color-muted);
  margin-top: 8px;
  max-width: 640px;
}

/* ---------- 相关链接底部导航 ---------- */

.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding) 48px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

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

.related-links-item {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  color: var(--color-accent);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
  line-height: 1.6;
}

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

/* ==========================================================================
   03. Components - 通用组件（按钮、卡片、标签、列表等）
   ========================================================================== */

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  line-height: 1.6;
  min-height: 44px;
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: #d05a26;
  border-color: #d05a26;
  color: #ffffff;
}

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

.btn-secondary:hover {
  background-color: var(--color-accent-light);
  color: #d05a26;
}

/* ---------- 频道卡片（首页） ---------- */

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

.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

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

.card-body {
  padding: 20px;
}

.card-body h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

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

.tag {
  display: inline-block;
  padding: 3px 12px;
  font-size: var(--font-size-tag);
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  border-radius: 999px;
  margin-bottom: 12px;
  line-height: 1.6;
}

.card-body a {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
}

/* ---------- 专题卡片（首页/专题页） ---------- */

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

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.feature-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.feature-card-body {
  padding: 20px;
}

.feature-card-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.4;
}

.feature-card-body p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 14px;
}

.feature-link {
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ---------- 时间线（首页/更新动态） ---------- */

.timeline-list {
  position: relative;
}

.timeline-item {
  position: relative;
  padding: 0 0 24px 28px;
  border-left: 2px solid var(--color-accent-light);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.timeline-item time {
  display: block;
  font-size: var(--font-size-small);
  color: var(--color-muted);
  margin-bottom: 4px;
}

.timeline-item a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
  display: inline-block;
}

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

/* ---------- 折叠问答 ---------- */

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  position: relative;
  list-style: none;
  padding-right: 44px;
  line-height: 1.6;
  transition: background-color var(--transition-fast);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-accent);
  font-weight: 400;
  transition: transform var(--transition-fast);
}

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

.faq-item[open] summary::after {
  content: "−";
  transform: translateY(-50%);
}

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
}

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

.faq-answer p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

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

.faq-answer a {
  font-size: 14px;
  font-weight: 500;
}

/* ---------- 更新类型标签 ---------- */

.update-type-tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: var(--font-size-tag);
  border-radius: 999px;
  line-height: 1.6;
  font-weight: 500;
}

.tag-new {
  background-color: #fde8d6;
  color: #c2531d;
}

.tag-adjust {
  background-color: #e8e0f5;
  color: #5f4b8b;
}

.tag-guide {
  background-color: #dce8f5;
  color: #3a5f8b;
}

.tag-content {
  background-color: #e0f0e4;
  color: #3a6b4a;
}

/* ==========================================================================
   04. Pages - 首页
   ========================================================================== */

/* ---------- 首屏 Hero ---------- */

.hero-section {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.hero-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px var(--container-padding) 48px;
  display: grid;
  grid-template-columns: 1.2fr 1.4fr 0.9fr;
  gap: 32px;
  align-items: start;
}

.hero-copy h1 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 16px;
}

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

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

.hero-media {
  position: relative;
}

.hero-figure {
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.hero-aside {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 20px;
}

.aside-block {
  margin-bottom: 20px;
}

.aside-block:last-child {
  margin-bottom: 0;
}

.aside-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.update-mini-list li {
  margin-bottom: 10px;
}

.update-mini-list li:last-child {
  margin-bottom: 0;
}

.update-mini-list li a {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
  display: block;
}

.update-mini-list li a:hover {
  color: var(--color-accent);
}

.aside-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  margin-top: 4px;
}

/* ---------- 频道分类速览 ---------- */

.channel-overview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px var(--container-padding) 0;
}

.section-header {
  margin-bottom: 28px;
}

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

/* ---------- 专题片单推荐 ---------- */

.feature-preview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px var(--container-padding) 0;
}

.feature-card-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* ---------- 观看指南步骤 ---------- */

.guide-steps {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px var(--container-padding) 0;
}

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

.step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 24px;
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.step-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.step-num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
}

.step-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.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: 500;
}

/* ---------- 更新动态摘要 ---------- */

.updates-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px var(--container-padding) 0;
}

.updates-summary .timeline-list {
  max-width: 720px;
}

.more-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 15px;
  font-weight: 500;
}

/* ---------- 反馈入口条 ---------- */

.feedback-entry {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px var(--container-padding) 0;
}

.feedback-inner {
  background-color: var(--color-accent-light);
  border-radius: var(--card-radius);
  padding: 36px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.feedback-inner .section-title {
  font-size: 20px;
  margin-bottom: 8px;
}

.feedback-inner p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.6;
  max-width: 600px;
}

/* ==========================================================================
   05. Pages - 频道分类页（channel.html）
   ========================================================================== */

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

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.filter-tab {
  padding: 8px 20px;
  font-size: 14px;
  color: var(--color-text-light);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
  line-height: 1.6;
  min-height: 40px;
}

.filter-tab:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-tab.is-active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

.channel-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 48px;
}

.channel-list .channel-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
}

.channel-thumb {
  overflow: hidden;
}

.channel-thumb img {
  width: 100%;
  height: 100%;
  min-height: 160px;
  object-fit: cover;
}

.channel-info {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.channel-info h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
  line-height: 1.4;
}

.channel-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 2px 12px;
  font-size: var(--font-size-tag);
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  border-radius: 999px;
  margin-bottom: 10px;
  line-height: 1.6;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

.channel-audience {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.channel-audience strong {
  color: var(--color-text);
  font-weight: 600;
}

.channel-link {
  font-size: 14px;
  font-weight: 500;
  align-self: flex-start;
}

/* 观看指南链接卡 */
.guide-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.guide-card p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 640px;
}

.guide-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 6px;
  transition: all var(--transition-fast);
  min-height: 40px;
}

.guide-btn:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* 频道页更新列表 */
.update-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
  max-width: 720px;
}

.update-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  line-height: 1.6;
}

.update-item time {
  color: var(--color-muted);
  flex-shrink: 0;
  font-size: var(--font-size-small);
}

.update-tag {
  flex-shrink: 0;
  font-size: var(--font-size-tag);
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  padding: 2px 10px;
  border-radius: 999px;
  line-height: 1.6;
}

.update-item a {
  color: var(--color-text);
  font-weight: 500;
}

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

.updates-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 15px;
  font-weight: 500;
}

/* 频道页反馈入口 */
.feedback-entry {
  margin-top: 48px;
  background-color: var(--color-accent-light);
  border-radius: var(--card-radius);
  padding: 32px;
  text-align: center;
}

.feedback-entry p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin: 12px 0 20px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.feedback-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  color: #ffffff;
  background-color: var(--color-accent);
  border-radius: 6px;
  transition: background-color var(--transition-fast);
  min-height: 44px;
}

.feedback-link:hover {
  background-color: #d05a26;
  color: #ffffff;
}

/* ==========================================================================
   06. Pages - 观看指南页（guide.html）
   ========================================================================== */

.guide-conclusion {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 28px;
  margin-bottom: 40px;
}

.guide-conclusion h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.4;
}

.guide-conclusion p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

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

/* 步骤网格 */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
  margin-bottom: 48px;
}

.step-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 24px;
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.step-number {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.step-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 播放页功能说明 */
.player-tips {
  margin-bottom: 48px;
}

.tips-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.tip-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 20px;
}

.tip-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.tip-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 观看记录提示 */
.history-tips {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 24px;
  margin-bottom: 24px;
}

.history-tips h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.4;
}

.history-tips p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}

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

/* 指南配图 */
.guide-media {
  margin: 24px 0 48px;
  border-radius: var(--card-radius);
  overflow: hidden;
}

.guide-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.guide-media figcaption {
  padding: 12px 16px;
  font-size: var(--font-size-small);
  color: var(--color-muted);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--card-radius) var(--card-radius);
  line-height: 1.6;
}

/* FAQ 摘要 */
.faq-brief {
  margin-bottom: 48px;
}

.faq-brief .faq-item {
  margin-bottom: 12px;
}

.faq-brief .faq-item summary {
  padding: 14px 44px 14px 20px;
}

.faq-brief .faq-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

.faq-brief .faq-item a {
  font-size: 14px;
  font-weight: 500;
}

/* 反馈链接卡 */
.feedback-link {
  background-color: var(--color-accent-light);
  border-radius: var(--card-radius);
  padding: 28px;
  text-align: center;
  margin-bottom: 48px;
}

.feedback-link h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.feedback-link p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   07. Pages - 专题推荐页（feature.html）
   ========================================================================== */

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

.group-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.group-tag {
  padding: 6px 18px;
  font-size: 14px;
  color: var(--color-text-light);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  line-height: 1.6;
}

.group-tag:first-child {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

/* 专题卡片网格 */
.feature-cards {
  margin-bottom: 48px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.card-content {
  padding: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.4;
}

.card-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

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

.card-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
}

/* 相关频道提及 */
.channel-mention {
  margin-bottom: 48px;
}

.mention-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.mention-list li a {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  color: var(--color-accent);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
  line-height: 1.6;
}

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

/* 指南链接卡 */
.guide-link-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 24px;
  margin-top: 16px;
}

.guide-link-card p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

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

/* ==========================================================================
   08. Pages - 更新动态页（updates.html）
   ========================================================================== */

.latest-update {
  margin-bottom: 48px;
}

.section-heading {
  margin-bottom: 20px;
}

.latest-update-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  overflow: hidden;
  display: grid;
  grid-template-columns: 320px 1fr;
}

.latest-update-media {
  overflow: hidden;
}

.latest-update-media img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

.latest-update-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.latest-update-body .update-type-tag {
  align-self: flex-start;
  margin-bottom: 12px;
}

.latest-update-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.update-date {
  font-size: var(--font-size-small);
  color: var(--color-muted);
  margin-bottom: 12px;
}

.latest-update-body p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.update-link {
  font-size: 14px;
  font-weight: 500;
  align-self: flex-start;
}

/* 时间线列表 */
.update-timeline {
  margin-bottom: 48px;
}

.timeline-list {
  position: relative;
}

.timeline-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 20px;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  margin-bottom: 16px;
  transition: box-shadow var(--transition-base);
}

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

.timeline-date {
  text-align: center;
  padding: 8px 0;
  border-right: 1px solid var(--color-border);
}

.date-day {
  display: block;
  font-size: 26px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.date-month {
  display: block;
  font-size: var(--font-size-tag);
  color: var(--color-muted);
  line-height: 1.6;
}

.timeline-content {
  display: flex;
  flex-direction: column;
}

.timeline-content .update-type-tag {
  align-self: flex-start;
  margin-bottom: 8px;
}

.timeline-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
  line-height: 1.4;
}

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

.timeline-content .update-link {
  align-self: flex-start;
}

/* 更新类型说明 */
.update-types {
  margin-bottom: 48px;
}

.update-types-intro {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 640px;
}

.type-tag-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.type-tag-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 20px;
}

.type-tag-badge {
  display: inline-block;
  margin-bottom: 10px;
}

.type-tag-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* 反馈卡片 */
.feedback-card {
  background-color: var(--color-accent-light);
  border-radius: var(--card-radius);
  padding: 32px;
  text-align: center;
}

.feedback-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.feedback-card p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.feedback-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   09. Pages - 常见问题页（faq.html）
   ========================================================================== */

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

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.category-tag {
  padding: 6px 18px;
  font-size: 14px;
  color: var(--color-text-light);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
  line-height: 1.6;
}

.category-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.category-tag:first-child {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

/* FAQ 分组 */
.faq-list {
  margin-bottom: 48px;
}

.faq-group {
  margin-bottom: 36px;
}

.faq-group-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent-light);
  line-height: 1.4;
}

.faq-figure {
  margin-bottom: 16px;
  border-radius: var(--card-radius);
  overflow: hidden;
}

.faq-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.faq-figure figcaption {
  padding: 10px 16px;
  font-size: var(--font-size-tag);
  color: var(--color-muted);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
  line-height: 1.6;
}

.faq-answer p {
  margin-bottom: 10px;
}

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

/* 指南链接与反馈链接 */
.guide-link-card,
.feedback-link-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 24px;
  margin-bottom: 20px;
}

.guide-link-card p,
.feedback-link-card p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

.guide-link-card a,
.feedback-link-card a {
  font-size: 14px;
  font-weight: 500;
}

/* ==========================================================================
   10. Pages - 反馈建议页（feedback.html）
   ========================================================================== */

.feedback-types {
  margin-bottom: 48px;
}

.type-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.type-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 20px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.type-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.type-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.type-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 材料清单 */
.feedback-materials {
  margin-bottom: 48px;
}

.material-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 720px;
}

.material-list li {
  position: relative;
  padding: 14px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.material-list li strong {
  color: var(--color-text);
  font-weight: 600;
}

/* 提交流程 */
.feedback-process {
  margin-bottom: 48px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 20px;
  margin-bottom: 24px;
}

.process-steps .step-item {
  padding: 20px;
}

.process-steps .step-number {
  font-size: 24px;
}

.process-steps .step-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

.process-steps .step-item strong {
  display: block;
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 15px;
}

.process-media {
  border-radius: var(--card-radius);
  overflow: hidden;
  margin-top: 24px;
}

.process-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.process-media figcaption {
  padding: 10px 16px;
  font-size: var(--font-size-tag);
  color: var(--color-muted);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
  line-height: 1.6;
}

/* 反馈结果 */
.feedback-result {
  margin-bottom: 48px;
}

.result-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 720px;
}

.result-list li {
  position: relative;
  padding: 14px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.result-list li strong {
  color: var(--color-text);
  font-weight: 600;
}

/* 相关链接 */
.related-links {
  margin-top: 8px;
}

.related-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 20px;
  flex: 1;
  min-width: 260px;
}

.related-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.related-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.related-link {
  font-size: 14px;
  font-weight: 500;
}

/* ==========================================================================
   11. Pages - 404 错误页
   ========================================================================== */

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px var(--container-padding);
  text-align: center;
}

.error-content {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 48px 32px;
  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-content h1 {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.4;
}

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

.error-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  color: #ffffff;
  background-color: var(--color-accent);
  border-radius: 6px;
  transition: background-color var(--transition-fast);
  min-height: 44px;
}

.error-back:hover {
  background-color: #d05a26;
  color: #ffffff;
}

/* ==========================================================================
   12. Responsive - 响应式适配（断点 768px）
   ========================================================================== */

@media (max-width: 768px) {
  /* 基础布局 */
  :root {
    --container-padding: 16px;
    --section-gap: 40px;
  }

  /* 页头 */
  .header-inner {
    height: 60px;
  }

  .brand-name {
    font-size: 17px;
  }

  /* 汉堡菜单 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 16px rgba(43, 33, 28, 0.08);
    margin-left: 0;
    display: block;
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    padding: 12px var(--container-padding) 16px;
    gap: 2px;
  }

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

  .nav-list li a {
    padding: 12px 12px;
    font-size: 15px;
    border-radius: 6px;
  }

  /* 页脚 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px var(--container-padding) 24px;
  }

  /* 内页骨架 */
  .site-main.inner-main {
    padding: 0 var(--container-padding) 40px;
  }

  .breadcrumb {
    padding-top: 14px;
    font-size: 13px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  .page-header {
    padding: 16px 0 24px;
  }

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

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

  /* 首页 Hero */
  .hero-grid {
    grid-template-columns: 1fr;
    padding: 32px var(--container-padding) 32px;
    gap: 24px;
  }

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

  .hero-figure img {
    height: 220px;
  }

  .hero-aside {
    order: 3;
  }

  /* 首页频道速览 */
  .channel-overview {
    padding-top: 40px;
  }

  .channel-group-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页专题预览 */
  .feature-preview {
    padding-top: 40px;
  }

  .feature-card-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页指南步骤 */
  .guide-steps {
    padding-top: 40px;
  }

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

  /* 首页更新摘要 */
  .updates-summary {
    padding-top: 40px;
  }

  /* 首页反馈入口 */
  .feedback-entry {
    padding-top: 40px;
  }

  .feedback-inner {
    padding: 24px;
    flex-direction: column;
    text-align: center;
  }

  /* 频道分类页 */
  .channel-list .channel-card {
    grid-template-columns: 1fr;
  }

  .channel-thumb img {
    height: 200px;
    min-height: 0;
  }

  .guide-card {
    flex-direction: column;
    text-align: center;
  }

  /* 观看指南页 */
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .tips-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .guide-media img {
    height: 200px;
  }

  /* 专题推荐页 */
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 更新动态页 */
  .latest-update-card {
    grid-template-columns: 1fr;
  }

  .latest-update-media img {
    height: 200px;
    min-height: 0;
  }

  .timeline-item {
    grid-template-columns: 56px 1fr;
    gap: 12px;
    padding: 16px;
  }

  .date-day {
    font-size: 22px;
  }

  .type-tag-list {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  /* 常见问题页 */
  .faq-figure img {
    height: 180px;
  }

  /* 反馈建议页 */
  .type-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .process-media img {
    height: 200px;
  }

  /* 相关链接 */
  .related-links {
    padding: 0 var(--container-padding) 32px;
  }

  .related-card {
    min-width: 100%;
  }

  /* 404 */
  .error-main {
    padding: 48px var(--container-padding);
  }

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

/* ---------- 小屏补充（390px） ---------- */

@media (max-width: 390px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

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

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

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

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

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

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

  .update-item {
    flex-wrap: wrap;
    gap: 6px;
  }
}

/* ==========================================================================
   13. Accessibility & Motion - 可访问性与动效
   ========================================================================== */

/* 焦点可见性 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

/* 滚动渐现动画（仅作为增强，不影响初始可见性） */
.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* 文本对比度保障 */
.brand-name,
.page-title,
.section-title,
.footer-brand-name,
.footer-title {
  color: var(--color-text);
}

.hero-description,
.section-desc,
.page-description,
.card-body p,
.card-desc,
.channel-desc,
.tip-item p,
.timeline-content p,
.faq-answer p,
.footer-brand p,
.footer-col ul li a {
  color: var(--color-muted);
}

/* 触摸目标保障 */
.nav-toggle,
.btn,
.filter-tab,
.guide-btn,
.feedback-link,
.error-back,
.related-links-item,
.category-tag,
.group-tag,
.mention-list li a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

/* 打印样式 */
@media print {
  .site-header,
  .site-footer,
  .related-links,
  .feedback-entry,
  .nav-toggle {
    display: none !important;
  }

  .site-main.inner-main {
    padding: 0;
  }

  body {
    background-color: #ffffff;
  }
}