/* ============================================
   海角社区 - 全球华人影视娱乐互动平台 原创样式表
   品牌色系：影视红 #E63946 / 深邃蓝 #1D3557 / 暖金 #F4A261
   hrbjh.com.cn
   ============================================ */

/* === 基础重置与全局 === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: #2B2D42;
  background: #F8F9FA;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: #E63946; text-decoration: none; transition: color .3s; }
a:hover { color: #F4A261; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* === 顶部导航 === */
.th-header {
  background: linear-gradient(135deg, #0D1117 0%, #1D3557 100%);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0,0,0,.3);
}
.th-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.th-logo { display: flex; align-items: center; gap: 10px; }
.th-logo img { height: 45px; width: auto; }
.th-logo span { color: #fff; font-size: 1.4rem; font-weight: 700; letter-spacing: 2px; }
.th-nav { display: flex; align-items: center; gap: 6px; }
.th-nav a {
  color: #cdd6e0;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: .95rem;
  transition: all .3s;
  white-space: nowrap;
}
.th-nav a:hover, .th-nav a.active {
  color: #fff;
  background: rgba(230,57,70,.85);
}
.th-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}
.th-hamburger span {
  width: 26px;
  height: 3px;
  background: #fff;
  border-radius: 2px;
  transition: .3s;
}

/* === 搜索框 === */
.th-search-bar {
  background: #1D3557;
  padding: 14px 0;
}
.th-search-bar .container {
  display: flex;
  justify-content: center;
}
.th-search-wrap {
  display: flex;
  max-width: 620px;
  width: 100%;
  border-radius: 30px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,.2);
}
.th-search-wrap input {
  flex: 1;
  padding: 12px 24px;
  border: none;
  font-size: 1rem;
  outline: none;
  background: #fff;
  color: #2B2D42;
}
.th-search-wrap input::placeholder { color: #8D99AE; }
.th-search-wrap button {
  padding: 12px 28px;
  background: #E63946;
  color: #fff;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  transition: background .3s;
  font-weight: 600;
}
.th-search-wrap button:hover { background: #c5303c; }

/* === Hero Banner === */
.th-hero {
  position: relative;
  height: 520px;
  overflow: hidden;
  background: #0D1117;
}
.th-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .7;
}
.th-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(13,17,23,.9) 0%, rgba(29,53,87,.6) 50%, transparent 100%);
  display: flex;
  align-items: center;
}
.th-hero-content {
  max-width: 600px;
  padding: 0 60px;
  color: #fff;
}
.th-hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
  text-shadow: 0 2px 10px rgba(0,0,0,.5);
}
.th-hero-content h1 em {
  color: #E63946;
  font-style: normal;
}
.th-hero-content p {
  font-size: 1.15rem;
  color: #cdd6e0;
  margin-bottom: 28px;
  line-height: 1.8;
}
.th-btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  transition: all .3s;
  cursor: pointer;
  border: none;
}
.th-btn-primary {
  background: #E63946;
  color: #fff;
  box-shadow: 0 4px 15px rgba(230,57,70,.4);
}
.th-btn-primary:hover {
  background: #c5303c;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230,57,70,.5);
}
.th-btn-outline {
  background: transparent;
  color: #F4A261;
  border: 2px solid #F4A261;
  margin-left: 12px;
}
.th-btn-outline:hover {
  background: #F4A261;
  color: #0D1117;
}

/* === 通用区块 === */
.th-section {
  padding: 70px 0;
}
.th-section-dark {
  background: #0D1117;
  color: #fff;
}
.th-section-alt {
  background: #f0f2f5;
}
.th-section-title {
  text-align: center;
  margin-bottom: 50px;
}
.th-section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: #1D3557;
  margin-bottom: 12px;
}
.th-section-dark .th-section-title h2 { color: #fff; }
.th-section-title p {
  font-size: 1.05rem;
  color: #8D99AE;
  max-width: 680px;
  margin: 0 auto;
}
.th-section-title .th-tag {
  display: inline-block;
  background: rgba(230,57,70,.12);
  color: #E63946;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 10px;
}

/* === 视频卡片网格 === */
.th-video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.th-video-card {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
  transition: all .35s;
  position: relative;
}
.th-video-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 35px rgba(0,0,0,.15);
}
.th-video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
}
.th-video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s;
}
.th-video-card:hover .th-video-thumb img {
  transform: scale(1.08);
}
.th-video-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.35);
  opacity: 0;
  transition: opacity .35s;
}
.th-video-card:hover .th-video-play { opacity: 1; }
.th-video-play svg {
  width: 56px;
  height: 56px;
  fill: #fff;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,.3));
}
.th-video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.75);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: .78rem;
}
.th-video-info {
  padding: 16px;
}
.th-video-info h3 {
  font-size: .95rem;
  font-weight: 600;
  color: #2B2D42;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.th-video-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: .82rem;
  color: #8D99AE;
}
.th-video-meta span { display: flex; align-items: center; gap: 4px; }
.th-video-tags {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.th-video-tags span {
  background: #f0f2f5;
  color: #6c757d;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: .75rem;
}

/* === 服务模块 === */
.th-services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.th-service-card {
  background: #fff;
  border-radius: 14px;
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,.06);
  transition: all .35s;
  border: 1px solid transparent;
}
.th-service-card:hover {
  border-color: #E63946;
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(230,57,70,.12);
}
.th-service-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, #E63946, #F4A261);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: #fff;
}
.th-service-card h3 {
  font-size: 1.15rem;
  color: #1D3557;
  margin-bottom: 10px;
}
.th-service-card p {
  font-size: .92rem;
  color: #8D99AE;
  line-height: 1.7;
}

/* === 专家展示 === */
.th-expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.th-expert-card {
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,.06);
  text-align: center;
  transition: all .35s;
}
.th-expert-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,.12);
}
.th-expert-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 28px auto 16px;
  overflow: hidden;
  border: 3px solid #E63946;
}
.th-expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.th-expert-card h3 { font-size: 1.1rem; color: #1D3557; margin-bottom: 4px; }
.th-expert-card .th-expert-title { color: #E63946; font-size: .88rem; font-weight: 600; }
.th-expert-card p { padding: 0 20px; font-size: .88rem; color: #8D99AE; margin: 10px 0; }
.th-expert-actions {
  padding: 16px 20px 24px;
  display: flex;
  gap: 10px;
  justify-content: center;
}
.th-expert-actions a {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 600;
}
.th-expert-actions .th-btn-sm-primary {
  background: #E63946;
  color: #fff;
}
.th-expert-actions .th-btn-sm-outline {
  border: 1px solid #1D3557;
  color: #1D3557;
}

/* === 品牌Logo墙 === */
.th-brand-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 40px;
  align-items: center;
}
.th-brand-item {
  width: 140px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  filter: grayscale(1);
  opacity: .6;
  transition: all .3s;
  font-size: 1.2rem;
  font-weight: 700;
  color: #8D99AE;
}
.th-brand-item:hover {
  filter: grayscale(0);
  opacity: 1;
  color: #1D3557;
}

/* === 用户评价 === */
.th-reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.th-review-card {
  background: #fff;
  border-radius: 14px;
  padding: 28px;
  box-shadow: 0 4px 20px rgba(0,0,0,.06);
  position: relative;
}
.th-review-card::before {
  content: "\201C";
  position: absolute;
  top: 12px;
  left: 20px;
  font-size: 4rem;
  color: rgba(230,57,70,.15);
  font-family: Georgia, serif;
  line-height: 1;
}
.th-review-stars { color: #F4A261; font-size: 1rem; margin-bottom: 10px; }
.th-review-card p {
  font-size: .95rem;
  color: #4a4e69;
  line-height: 1.8;
  margin-bottom: 14px;
  padding-left: 10px;
}
.th-review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.th-review-author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #E63946, #F4A261);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}
.th-review-author-info strong { font-size: .9rem; color: #1D3557; }
.th-review-author-info span { display: block; font-size: .8rem; color: #8D99AE; }

/* === FAQ === */
.th-faq-list { max-width: 800px; margin: 0 auto; }
.th-faq-item {
  background: #fff;
  border-radius: 12px;
  margin-bottom: 14px;
  box-shadow: 0 2px 12px rgba(0,0,0,.05);
  overflow: hidden;
}
.th-faq-q {
  padding: 20px 24px;
  font-weight: 600;
  font-size: 1rem;
  color: #1D3557;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background .3s;
}
.th-faq-q:hover { background: #f8f9fa; }
.th-faq-q::after {
  content: "+";
  font-size: 1.4rem;
  color: #E63946;
  font-weight: 300;
  transition: transform .3s;
}
.th-faq-item.active .th-faq-q::after {
  content: "\2212";
}
.th-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease, padding .4s;
  padding: 0 24px;
  font-size: .93rem;
  color: #6c757d;
  line-height: 1.8;
}
.th-faq-item.active .th-faq-a {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* === 联系我们 === */
.th-contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  align-items: start;
}
.th-contact-info h3 {
  font-size: 1.3rem;
  color: #1D3557;
  margin-bottom: 20px;
}
.th-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.th-contact-icon {
  width: 44px;
  height: 44px;
  background: rgba(230,57,70,.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #E63946;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.th-contact-item strong { display: block; font-size: .92rem; color: #1D3557; }
.th-contact-item span { font-size: .88rem; color: #8D99AE; }
.th-contact-qr {
  display: flex;
  gap: 30px;
  justify-content: center;
}
.th-contact-qr-item {
  text-align: center;
}
.th-contact-qr-item img {
  width: 160px;
  height: 160px;
  border-radius: 10px;
  margin-bottom: 8px;
}
.th-contact-qr-item p { font-size: .88rem; color: #8D99AE; }

/* === 社交分享 === */
.th-share-bar {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 20px 0;
}
.th-share-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  transition: all .3s;
  cursor: pointer;
}
.th-share-btn:hover { transform: scale(1.15); }
.th-share-wechat { background: #07C160; }
.th-share-weibo { background: #E6162D; }
.th-share-douyin { background: #161823; }
.th-share-bilibili { background: #00A1D6; }

/* === 页脚 === */
.th-footer {
  background: #0D1117;
  color: #8D99AE;
  padding: 50px 0 0;
}
.th-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.th-footer-brand .th-logo { margin-bottom: 16px; }
.th-footer-brand p { font-size: .9rem; line-height: 1.8; }
.th-footer h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}
.th-footer h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: #E63946;
}
.th-footer ul li { margin-bottom: 10px; }
.th-footer ul li a { color: #8D99AE; font-size: .9rem; }
.th-footer ul li a:hover { color: #F4A261; }
.th-footer-bottom {
  text-align: center;
  padding: 24px 0;
  font-size: .85rem;
  color: #6c757d;
}
.th-footer-qr {
  display: flex;
  gap: 20px;
}
.th-footer-qr img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
}

/* === 面包屑 === */
.th-breadcrumb {
  padding: 16px 0;
  font-size: .88rem;
  color: #8D99AE;
}
.th-breadcrumb a { color: #E63946; }
.th-breadcrumb span { margin: 0 8px; color: #ccc; }

/* === 内页通用 === */
.th-page-hero {
  background: linear-gradient(135deg, #0D1117, #1D3557);
  padding: 60px 0;
  text-align: center;
  color: #fff;
}
.th-page-hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.th-page-hero p {
  font-size: 1.05rem;
  color: #cdd6e0;
  max-width: 600px;
  margin: 0 auto;
}
.th-content-section {
  padding: 50px 0;
}
.th-content-section h2 {
  font-size: 1.6rem;
  color: #1D3557;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #E63946;
  display: inline-block;
}
.th-content-section p {
  font-size: .95rem;
  color: #4a4e69;
  line-height: 1.9;
  margin-bottom: 16px;
}

/* === How-To 指南 === */
.th-howto-steps {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.th-howto-step {
  flex: 1;
  min-width: 220px;
  max-width: 280px;
  text-align: center;
  padding: 28px 20px;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,.06);
}
.th-howto-num {
  width: 50px;
  height: 50px;
  background: #E63946;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 auto 14px;
}
.th-howto-step h4 { font-size: 1rem; color: #1D3557; margin-bottom: 8px; }
.th-howto-step p { font-size: .88rem; color: #8D99AE; }

/* === AI赋能区块 === */
.th-ai-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.th-ai-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 14px;
  padding: 32px 24px;
  text-align: center;
  transition: all .35s;
}
.th-ai-card:hover {
  background: rgba(230,57,70,.1);
  border-color: #E63946;
  transform: translateY(-4px);
}
.th-ai-card h3 { color: #fff; font-size: 1.1rem; margin-bottom: 10px; }
.th-ai-card p { color: #8D99AE; font-size: .9rem; }
.th-ai-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

/* === 社区功能 === */
.th-community-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.th-community-card {
  background: #fff;
  border-radius: 14px;
  padding: 28px 24px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,.06);
  transition: all .35s;
  border-left: 4px solid #E63946;
}
.th-community-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,.12);
}
.th-community-card h3 { font-size: 1.05rem; color: #1D3557; margin-bottom: 8px; }
.th-community-card p { font-size: .88rem; color: #8D99AE; }

/* === 数据统计 === */
.th-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  padding: 40px 0;
}
.th-stat-item { text-align: center; }
.th-stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: #E63946;
  line-height: 1;
}
.th-stat-label {
  font-size: .92rem;
  color: #8D99AE;
  margin-top: 6px;
}

/* === 响应式 === */
@media (max-width: 1024px) {
  .th-video-grid { grid-template-columns: repeat(3, 1fr); }
  .th-expert-grid { grid-template-columns: repeat(2, 1fr); }
  .th-footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .th-hamburger { display: flex; }
  .th-nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: #0D1117;
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    box-shadow: 0 10px 30px rgba(0,0,0,.3);
  }
  .th-nav.active { display: flex; }
  .th-nav a { padding: 12px 16px; width: 100%; }
  .th-hero { height: 400px; }
  .th-hero-content { padding: 0 24px; }
  .th-hero-content h1 { font-size: 1.8rem; }
  .th-video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .th-services-grid { grid-template-columns: repeat(2, 1fr); }
  .th-ai-features { grid-template-columns: 1fr; }
  .th-community-grid { grid-template-columns: 1fr; }
  .th-reviews-grid { grid-template-columns: 1fr; }
  .th-contact-grid { grid-template-columns: 1fr; }
  .th-expert-grid { grid-template-columns: repeat(2, 1fr); }
  .th-footer-grid { grid-template-columns: 1fr; }
  .th-stats { flex-wrap: wrap; gap: 30px; }
  .th-brand-wall { gap: 20px; }
  .th-howto-steps { flex-direction: column; align-items: center; }
}
@media (max-width: 480px) {
  .th-video-grid { grid-template-columns: 1fr; }
  .th-expert-grid { grid-template-columns: 1fr; }
  .th-hero { height: 320px; }
  .th-hero-content h1 { font-size: 1.5rem; }
  .th-section { padding: 40px 0; }
  .th-contact-qr { flex-direction: column; align-items: center; }
}

/* === 动画 === */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.th-animate {
  opacity: 0;
  animation: fadeInUp .6s ease forwards;
}

/* === 视频标签高亮 === */
.th-video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: #E63946;
  color: #fff;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: .75rem;
  font-weight: 600;
  z-index: 2;
}

/* === 内页文章样式 === */
.th-article {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}
.th-article h2 {
  font-size: 1.5rem;
  color: #1D3557;
  margin: 30px 0 15px;
  padding-left: 14px;
  border-left: 4px solid #E63946;
}
.th-article h3 {
  font-size: 1.2rem;
  color: #2B2D42;
  margin: 24px 0 12px;
}
.th-article p {
  font-size: .95rem;
  line-height: 1.9;
  color: #4a4e69;
  margin-bottom: 16px;
}
.th-article ul {
  padding-left: 20px;
  margin-bottom: 16px;
}
.th-article ul li {
  list-style: disc;
  font-size: .93rem;
  color: #4a4e69;
  margin-bottom: 8px;
  line-height: 1.7;
}


/* === 视频弹窗 === */
.th-video-modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 9999;
  opacity: 0;
  transition: opacity .3s;
}
.th-video-modal-show { opacity: 1; }
.th-video-modal-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.85);
  cursor: pointer;
}
.th-video-modal-content {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 800px;
  background: #111;
  border-radius: 12px;
  overflow: hidden;
}
.th-video-modal-close {
  position: absolute;
  top: 10px; right: 16px;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  z-index: 10;
  line-height: 1;
}
.th-video-modal-player {
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}
.th-video-modal-placeholder {
  text-align: center;
  color: #fff;
}
.th-video-modal-placeholder p {
  margin-top: 16px;
  font-size: 1.1rem;
  font-weight: 600;
}
.th-video-modal-placeholder span {
  display: block;
  margin-top: 8px;
  color: #888;
  font-size: .9rem;
}

/* === 返回顶部 === */
.th-back-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #E63946, #F4A261);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: all .3s;
  z-index: 999;
  box-shadow: 0 4px 15px rgba(230,57,70,.4);
}
.th-back-top-show {
  opacity: 1;
  transform: translateY(0);
}
.th-back-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(230,57,70,.6);
}

/* === 滚动动画 === */
.th-service-card,
.th-ai-card,
.th-community-card,
.th-expert-card,
.th-review-card,
.th-video-card,
.th-howto-step {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}
.th-animate-in {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* === 导航滚动效果 === */
.th-header-scrolled {
  background: linear-gradient(135deg, #0D1117 0%, #1D3557 100%) !important;
  box-shadow: 0 4px 30px rgba(0,0,0,.5) !important;
}
.th-header-scrolled .container {
  height: 60px;
}

/* === 数字动画 === */
.th-num-animated {
  animation: numPulse .6s ease;
}
@keyframes numPulse {
  0% { transform: scale(0.8); opacity: 0; }
  60% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}

/* === 图片加载动画 === */
.th-img-loaded {
  animation: imgFadeIn .5s ease;
}
@keyframes imgFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}