/* ============================================================
   feiyuewenxue.com - 精东影视 整站样式
   年轻内容风 · 明快色彩 · 紧凑标签 · 动态图文节奏
   ============================================================ */

/* ============================================================
   Base
   ============================================================ */
:root {
  --color-primary: #FF5A5F;
  --color-secondary: #2D2D2D;
  --color-bg: #F7F7F7;
  --color-accent: #FFB400;
  --color-link: #1E88E5;
  --color-text: #2D2D2D;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  --color-border: #E5E5E5;
  --color-white: #FFFFFF;
  --radius-card: 8px;
  --radius-small: 4px;
  --container-width: 1200px;
  --header-height: 64px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.10);
  --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

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

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

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

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 17px;
}

p {
  margin-bottom: 12px;
}

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

/* ============================================================
   Layout - 全局骨架
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
}

.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;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.site-brand a {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.brand-tagline {
  font-size: 13px;
  color: var(--color-text-lighter);
  display: none;
}

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

.site-nav .nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-nav .nav-list a:hover {
  background-color: rgba(255, 90, 95, 0.08);
  color: var(--color-primary);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  width: 44px;
  height: 44px;
  cursor: pointer;
  position: relative;
  z-index: 110;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-secondary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  content: '';
}

.nav-toggle-icon {
  position: relative;
  margin: 0 auto;
}

.nav-toggle-icon::before {
  position: absolute;
  top: -7px;
  left: 0;
}

.nav-toggle-icon::after {
  position: absolute;
  top: 7px;
  left: 0;
}

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

.site-footer {
  background-color: var(--color-secondary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: 60px;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 32px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-col h3 {
  color: var(--color-white);
  font-size: 16px;
  margin-bottom: 14px;
}

.footer-col p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 8px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  padding: 3px 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 16px 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  margin: 0;
}

/* ============================================================
   Layout - 内页骨架
   ============================================================ */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px 20px 0;
  width: 100%;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-lighter);
  padding: 8px 0 16px;
}

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

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

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

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

.page-header {
  padding: 16px 0 28px;
}

.page-title {
  font-size: 28px;
  margin-bottom: 10px;
}

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

.section-title {
  font-size: 22px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

/* ============================================================
   Components - 通用组件
   ============================================================ */
.section-heading {
  text-align: center;
  margin-bottom: 32px;
}

.section-heading h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-lead {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 720px;
  margin: 0 auto;
}

.section-head {
  margin-bottom: 24px;
}

.section-head h2 {
  font-size: 22px;
  margin-bottom: 6px;
}

.section-head p {
  font-size: 15px;
  color: var(--color-text-light);
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 720px;
  margin-bottom: 24px;
}

/* 卡片通用 */
.channel-card,
.video-card,
.feature-card,
.theme-card,
.trouble-card,
.feedback-item,
.usage-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.channel-card:hover,
.video-card:hover,
.feature-card:hover,
.theme-card:hover,
.trouble-card:hover,
.usage-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

/* 卡片图片 */
.channel-figure,
.video-card figure,
.feature-card img,
.theme-card img {
  width: 100%;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
  object-fit: cover;
}

/* 链接卡片 */
.guide-link-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  display: block;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.guide-link-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}

.guide-link-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--color-secondary);
}

.guide-link-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

/* ============================================================
   Components - 首页
   ============================================================ */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Hero 场景选择 */
.hero-scene {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  padding: 40px 0 48px;
  align-items: center;
}

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

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

.hero-content h1 {
  font-size: 30px;
  margin-bottom: 12px;
}

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

.scene-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.scene-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 18px 16px;
  display: block;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.scene-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}

.scene-icon {
  font-size: 26px;
  line-height: 1;
  display: block;
  margin-bottom: 10px;
}

.scene-title {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 4px;
}

.scene-desc {
  display: block;
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* 频道标签栏 */
.channel-tabs {
  padding: 32px 0;
}

.tab-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.tab-item {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 14px;
  color: var(--color-text);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.tab-item:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* 视频目录区 */
.video-directory {
  padding: 32px 0;
}

.directory-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  align-items: start;
}

.filter-sidebar {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 16px);
}

.filter-sidebar h3 {
  font-size: 16px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.filter-list li {
  margin-bottom: 2px;
}

.filter-list a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.filter-list a:hover {
  background-color: rgba(255, 90, 95, 0.08);
  color: var(--color-primary);
}

.video-list .time-group {
  margin-bottom: 28px;
}

.video-list .time-group h3 {
  font-size: 17px;
  margin-bottom: 14px;
  padding-left: 10px;
  border-left: 3px solid var(--color-primary);
}

.video-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.video-card {
  overflow: hidden;
}

.video-card figure {
  margin: 0;
}

.video-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
}

.video-card-body {
  padding: 14px;
}

.video-card-body h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.video-card-body p {
  font-size: 13px;
  color: var(--color-text-light);
  margin: 0;
}

/* 观看指南摘要 */
.guide-summary {
  padding: 40px 0;
}

.step-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.step-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  position: relative;
  border-top: 3px solid var(--color-primary);
}

.step-num {
  display: inline-block;
  width: 28px;
  height: 28px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  line-height: 28px;
  margin-bottom: 10px;
}

.step-card h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.step-card p {
  font-size: 13px;
  color: var(--color-text-light);
  margin: 0;
}

.guide-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-small);
  font-size: 15px;
  transition: background-color var(--transition-fast);
}

.guide-link:hover {
  background-color: #E04A4F;
  color: var(--color-white);
}

/* 入口核验提示 */
.verify-tip {
  padding: 20px 0 32px;
}

.tip-content {
  background-color: #FFF8E6;
  border-radius: var(--radius-card);
  border-left: 4px solid var(--color-accent);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.tip-content h2 {
  font-size: 18px;
  margin: 0;
  white-space: nowrap;
}

.tip-content p {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
  flex: 1;
}

.tip-content a {
  color: var(--color-primary);
  font-weight: 500;
  white-space: nowrap;
}

/* 反馈入口 */
.feedback-entry {
  padding: 32px 0;
  text-align: center;
}

.feedback-entry h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.feedback-entry p {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto 20px;
}

.feedback-entry a {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  color: var(--color-text);
  font-size: 15px;
  margin: 0 6px;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.feedback-entry a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ============================================================
   Components - 频道页
   ============================================================ */
.channel-grid {
  margin-bottom: 48px;
}

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

.channel-card {
  overflow: hidden;
}

.channel-card a {
  display: block;
}

.channel-figure {
  margin: 0;
  overflow: hidden;
}

.channel-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.channel-card:hover .channel-figure img {
  transform: scale(1.04);
}

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

.channel-card-body h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.channel-card-body p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.channel-tag {
  display: inline-block;
  font-size: 12px;
  background-color: rgba(255, 90, 95, 0.08);
  color: var(--color-primary);
  padding: 3px 10px;
  border-radius: 12px;
  margin-right: 6px;
}

/* 频道特色说明 */
.channel-detail-list {
  margin-bottom: 48px;
}

.channel-detail-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  margin-bottom: 16px;
  border-left: 4px solid var(--color-primary);
}

.detail-text h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.detail-text p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.detail-link {
  margin-top: 10px;
}

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

/* 频道指南链接 */
.channel-guide-links {
  margin-bottom: 48px;
}

.guide-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* ============================================================
   Components - 专题页
   ============================================================ */
.hot-features {
  margin-bottom: 48px;
}

.hot-features > h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

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

.feature-card {
  overflow: hidden;
}

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

.feature-card h3 {
  font-size: 16px;
  padding: 14px 14px 4px;
}

.feature-card p {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 0 14px 14px;
  margin: 0;
}

/* 主题片单 */
.theme-list {
  margin-bottom: 48px;
}

.theme-list > h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.theme-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  align-items: start;
}

.theme-sidebar {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 16px);
}

.theme-sidebar h3 {
  font-size: 16px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.theme-tags li {
  margin-bottom: 2px;
}

.theme-tags a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-tags a:hover {
  background-color: rgba(255, 90, 95, 0.08);
  color: var(--color-primary);
}

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

.theme-card {
  overflow: hidden;
}

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

.theme-card-content {
  padding: 16px;
}

.theme-card-content h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.theme-card-content p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.theme-card-content a {
  font-size: 14px;
  font-weight: 500;
}

/* 灵感说明 */
.inspiration-note {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 28px;
  margin-bottom: 48px;
}

.inspiration-note h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.inspiration-note p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.inspiration-note a {
  display: inline-block;
  margin-right: 20px;
  font-size: 15px;
  font-weight: 500;
}

/* ============================================================
   Components - 指南页
   ============================================================ */
.step-guide {
  margin-bottom: 48px;
}

.step-list {
  counter-reset: step;
  margin-bottom: 24px;
}

.step-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  margin-bottom: 12px;
}

.step-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-content h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.step-content p {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

.guide-media {
  margin: 24px 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-white);
  box-shadow: var(--shadow-card);
}

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

.guide-media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
}

/* 清晰度与网络要求 */
.requirements {
  margin-bottom: 48px;
}

.requirements-table-wrap {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  overflow-x: auto;
}

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

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

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

.requirements-table tr:last-child td {
  border-bottom: none;
}

.requirements-table tr:nth-child(even) td {
  background-color: #FAFAFA;
}

.table-note {
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-top: 12px;
}

/* 常见问题排查 */
.troubleshooting {
  margin-bottom: 48px;
}

.trouble-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.trouble-card {
  padding: 20px;
}

.trouble-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.trouble-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

.trouble-more {
  margin-top: 20px;
  font-size: 15px;
}

.trouble-more a {
  margin-right: 16px;
}

/* 相关链接 */
.related-links {
  margin-bottom: 48px;
}

.related-links > h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.related-list {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 16px 20px;
}

.related-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.related-list a {
  font-size: 15px;
}

/* ============================================================
   Components - 核验页
   ============================================================ */
.checklist-section {
  margin-bottom: 48px;
}

.checklist-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.check-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  display: flex;
  gap: 16px;
}

.check-num {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  background-color: var(--color-accent);
  color: var(--color-secondary);
  border-radius: 50%;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.check-content h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

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

.check-standard {
  background-color: #F0F7EC;
  border-radius: var(--radius-small);
  padding: 8px 12px;
  margin-top: 8px;
}

.check-standard strong {
  color: #2E7D32;
  font-size: 13px;
}

/* 异常特征 */
.abnormal-section {
  margin-bottom: 48px;
}

.abnormal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.abnormal-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

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

.abnormal-card figcaption {
  padding: 16px;
}

.abnormal-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.abnormal-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.abnormal-tip {
  background-color: #FDECEA;
  border-radius: var(--radius-small);
  padding: 8px 12px;
}

.abnormal-tip strong {
  color: #C62828;
  font-size: 13px;
}

/* 安全提示 */
.safety-tip-section {
  margin-bottom: 48px;
}

.safety-tip {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-primary);
  padding: 28px;
}

.safety-tip h2 {
  font-size: 20px;
  margin-bottom: 10px;
}

.safety-tip p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.safety-tip a {
  display: inline-block;
  margin-right: 20px;
  font-weight: 500;
}

/* 相关链接列表 */
.related-links-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-links-list a {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.related-links-list a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  color: var(--color-primary);
}

/* ============================================================
   Components - 问答页
   ============================================================ */
.faq-section {
  margin-bottom: 48px;
}

.faq-list {
  margin-bottom: 24px;
}

.faq-item {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-item summary {
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-secondary);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: color var(--transition-fast);
}

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

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

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

.faq-answer {
  padding: 0 20px 18px;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

/* 反馈视图 */
.feedback-view-section {
  margin-bottom: 48px;
}

.feedback-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feedback-item {
  padding: 20px;
}

.feedback-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.feedback-tag {
  display: inline-block;
  font-size: 12px;
  background-color: rgba(255, 180, 0, 0.15);
  color: #B8860B;
  padding: 3px 10px;
  border-radius: 12px;
}

/* 问题状态 */
.question-status-section {
  margin-bottom: 48px;
}

.status-tabs {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 20px;
}

.status-tab-list {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.status-tab {
  display: inline-block;
  padding: 8px 18px;
  background-color: var(--color-bg);
  border-radius: var(--radius-small);
  font-size: 14px;
  color: var(--color-text);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.status-tab.is-active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.status-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

.faq-media {
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-white);
  box-shadow: var(--shadow-card);
}

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

.faq-media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
}

/* ============================================================
   Components - 关于页
   ============================================================ */
.about-section {
  margin-bottom: 48px;
}

.about-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.about-section p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 14px;
  max-width: 760px;
}

.about-figure {
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-white);
  box-shadow: var(--shadow-card);
  margin: 20px 0;
}

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

.about-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
}

.boundary-list {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px 24px;
  margin: 16px 0;
}

.boundary-list li {
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
  font-size: 15px;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

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

.boundary-list li::before {
  content: '·';
  position: absolute;
  left: 6px;
  color: var(--color-primary);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
}

.usage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 20px 0;
}

.usage-card {
  padding: 24px;
}

.usage-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
}

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

.usage-card a {
  font-weight: 500;
  font-size: 14px;
}

.usage-tip {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 16px 20px;
  margin-top: 20px;
}

.usage-tip a {
  margin-right: 16px;
  font-weight: 500;
}

/* ============================================================
   Components - 404页
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 300px);
  padding: 60px 20px;
}

.error-content {
  text-align: center;
  max-width: 480px;
}

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

.error-content h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

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

.error-home-link {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-small);
  font-size: 15px;
  transition: background-color var(--transition-fast);
}

.error-home-link:hover {
  background-color: #E04A4F;
  color: var(--color-white);
}

/* ============================================================
   Responsive - 桌面
   ============================================================ */
@media (min-width: 1200px) {
  .brand-tagline {
    display: inline;
  }
}

/* ============================================================
   Responsive - 平板
   ============================================================ */
@media (max-width: 1024px) {
  .hero-scene {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero-visual img {
    height: 260px;
  }

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

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

  .theme-cards {
    grid-template-columns: 1fr;
  }

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

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

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

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

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

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

/* ============================================================
   Responsive - 手机
   ============================================================ */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav .nav-list {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    flex-direction: column;
    padding: 8px 16px 16px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
    display: none;
    border-bottom: 1px solid var(--color-border);
  }

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

  .site-nav .nav-list a {
    padding: 12px 14px;
    font-size: 16px;
  }

  .home-main,
  .inner-main {
    padding: 0 16px;
  }

  .hero-scene {
    padding: 24px 0 32px;
  }

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

  .scene-cards {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .scene-card {
    padding: 14px 12px;
  }

  .scene-icon {
    font-size: 22px;
  }

  .scene-title {
    font-size: 15px;
  }

  .directory-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .filter-sidebar {
    position: static;
    padding: 14px;
  }

  .filter-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .filter-list li {
    margin: 0;
  }

  .filter-list a {
    padding: 6px 12px;
    font-size: 13px;
    background-color: var(--color-bg);
    border-radius: 16px;
  }

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

  .video-card img {
    height: 120px;
  }

  .step-cards {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .step-card {
    padding: 14px;
  }

  .tip-content {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    gap: 10px;
  }

  .channel-cards {
    grid-template-columns: 1fr;
    gap: 14px;
  }

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

  .guide-links-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .feature-scroll {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .theme-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .theme-sidebar {
    position: static;
    padding: 14px;
  }

  .theme-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .theme-tags li {
    margin: 0;
  }

  .theme-tags a {
    padding: 6px 12px;
    font-size: 13px;
    background-color: var(--color-bg);
    border-radius: 16px;
  }

  .theme-cards {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .theme-card img {
    height: 140px;
  }

  .trouble-cards {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .requirements-table-wrap {
    padding: 14px;
  }

  .requirements-table th,
  .requirements-table td {
    padding: 10px 8px;
    font-size: 13px;
  }

  .step-item {
    padding: 14px;
    gap: 12px;
  }

  .guide-media img {
    height: 180px;
  }

  .abnormal-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .abnormal-card img {
    height: 140px;
  }

  .related-links-list {
    grid-template-columns: 1fr;
    gap: 10px;
  }

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

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

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 32px 16px 24px;
  }

  .footer-col {
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .footer-col:last-child {
    border-bottom: none;
  }

  .page-header {
    padding: 12px 0 20px;
  }

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

  .page-description {
    font-size: 14px;
  }

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

/* ============================================================
   Responsive - 小屏手机
   ============================================================ */
@media (max-width: 480px) {
  .scene-cards {
    grid-template-columns: 1fr;
  }

  .video-cards {
    grid-template-columns: 1fr;
  }

  .video-card img {
    height: 160px;
  }

  .step-cards {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   动效增强（不影响初始可见性）
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .scene-card,
  .channel-card,
  .video-card,
  .feature-card,
  .theme-card,
  .trouble-card,
  .usage-card,
  .guide-link-card {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  }
}

/* 滚动渐现（仅作为增强，不阻塞初始可见性） */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 1;
  }
}