/* ========================================
   溏心mv网红视频 - 全站样式表
   131985.cn
   ======================================== */

/* CSS Variables */
:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #5eead4;
  --accent: #f97316;
  --accent-dark: #ea580c;
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-light: #f8fafc;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-dark: #1e293b;
  --text-dark-secondary: #64748b;
  --border-color: #334155;
  --border-light: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -2px rgba(0,0,0,.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -4px rgba(0,0,0,.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all .3s ease;
  --max-width: 1200px;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* Container */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ========== Header ========== */
.site-header {
  background: rgba(15,23,42,.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 42px; width: 42px; border-radius: 8px; }
.logo-text { font-size: 1.15rem; font-weight: 700; color: var(--text-primary); }
.logo-text span { color: var(--accent); }

/* Navigation */
.main-nav { display: flex; align-items: center; gap: 0; }
.main-nav a {
  padding: 8px 16px;
  color: var(--text-secondary);
  font-size: .9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-primary);
  background: rgba(255,255,255,.05);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 5px;
}

/* Search Bar */
.search-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0;
}
.search-bar .container { display: flex; justify-content: center; }
.search-box {
  display: flex;
  max-width: 600px;
  width: 100%;
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  overflow: hidden;
}
.search-box input {
  flex: 1;
  padding: 10px 20px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: .9rem;
  outline: none;
}
.search-box input::placeholder { color: var(--text-secondary); }
.search-box button {
  padding: 10px 24px;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: .9rem;
  font-weight: 500;
  transition: var(--transition);
}
.search-box button:hover { background: var(--primary-dark); }

/* ========== Hero Banner ========== */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 420px;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(.4);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 20px;
  text-align: center;
  width: 100%;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}
.hero h1 .brand-highlight { color: var(--accent); }
.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 30px;
}
.hero-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 30px; }
.hero-tags span {
  padding: 6px 16px;
  background: rgba(255,255,255,.1);
  border-radius: 50px;
  font-size: .85rem;
  color: var(--text-secondary);
}
.hero-btns { display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--text-primary); border: 2px solid var(--border-color); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary-light); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); color: #fff; }
.btn-sm { padding: 8px 18px; font-size: .85rem; }

/* ========== Section ========== */
.section { padding: 60px 0; }
.section-alt { background: var(--bg-card); }
.section-light { background: var(--bg-light); color: var(--text-dark); }
.section-title {
  text-align: center;
  margin-bottom: 40px;
}
.section-title h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.section-title p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}
.section-light .section-title p { color: var(--text-dark-secondary); }

/* ========== Video Card Grid ========== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.video-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.section-light .video-card { background: #fff; border-color: var(--border-light); }
.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  cursor: pointer;
}
.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(.8);
  width: 60px;
  height: 60px;
  background: rgba(0,0,0,.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.play-btn::after {
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-card:hover .play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.8);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: .75rem;
}
.video-info { padding: 14px 16px; }
.video-info h3 {
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .8rem;
  color: var(--text-secondary);
}
.section-light .video-meta { color: var(--text-dark-secondary); }
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.video-tags span {
  padding: 2px 10px;
  background: rgba(13,148,136,.15);
  color: var(--primary-light);
  border-radius: 50px;
  font-size: .75rem;
}
.section-light .video-tags span { background: rgba(13,148,136,.1); color: var(--primary-dark); }

/* ========== Module Grid ========== */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}
.module-card:hover { transform: translateY(-4px); border-color: var(--primary); box-shadow: var(--shadow-lg); }
.module-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.5rem;
}
.module-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.module-card p { font-size: .88rem; color: var(--text-secondary); line-height: 1.6; }

/* ========== Expert Section ========== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 3px solid var(--primary);
}
.expert-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 4px; }
.expert-role { color: var(--primary-light); font-size: .85rem; margin-bottom: 10px; }
.expert-desc { font-size: .85rem; color: var(--text-secondary); margin-bottom: 14px; line-height: 1.6; }
.expert-btns { display: flex; justify-content: center; gap: 10px; }

/* ========== FAQ Section ========== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}
.section-light .faq-item { background: #fff; border-color: var(--border-light); }
.faq-question {
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: .95rem;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary-light); }
.section-light .faq-question { color: var(--text-dark); }
.section-light .faq-question:hover { color: var(--primary); }
.faq-arrow {
  transition: transform .3s ease;
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-left: 10px;
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease, padding .3s ease;
}
.faq-item.active .faq-answer { max-height: 300px; }
.faq-answer-inner {
  padding: 0 20px 16px;
  font-size: .9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.section-light .faq-answer-inner { color: var(--text-dark-secondary); }

/* ========== Reviews ========== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.section-light .review-card { background: #fff; border-color: var(--border-light); }
.review-stars { color: #fbbf24; font-size: 1rem; margin-bottom: 10px; letter-spacing: 2px; }
.review-text { font-size: .9rem; color: var(--text-secondary); margin-bottom: 14px; line-height: 1.7; font-style: italic; }
.section-light .review-text { color: var(--text-dark-secondary); }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: .9rem;
}
.review-author-info span { display: block; }
.review-author-name { font-weight: 600; font-size: .9rem; }
.review-author-date { font-size: .8rem; color: var(--text-secondary); }

/* ========== Partners ========== */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  align-items: center;
}
.partner-item {
  padding: 16px 28px;
  background: rgba(255,255,255,.05);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.partner-item:hover { border-color: var(--primary); color: var(--primary-light); }

/* ========== Contact Section ========== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.contact-card h4 { font-size: 1rem; margin-bottom: 10px; color: var(--primary-light); }
.contact-card p { font-size: .88rem; color: var(--text-secondary); line-height: 1.7; }
.contact-card img { max-width: 140px; margin: 10px auto 0; border-radius: 8px; }

/* ========== How-To Guide ========== */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.howto-step {
  text-align: center;
  padding: 20px;
}
.step-number {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 auto 14px;
}
.howto-step h4 { font-size: 1rem; margin-bottom: 8px; }
.howto-step p { font-size: .85rem; color: var(--text-secondary); }

/* ========== Share Buttons ========== */
.share-bar {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 20px 0;
}
.share-btn {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: .85rem;
  font-weight: 500;
  color: #fff;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.share-btn:hover { transform: translateY(-2px); opacity: .9; }
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #161823; border: 1px solid #333; }
.share-bilibili { background: #fb7299; }

/* ========== Footer ========== */
.site-footer {
  background: #0a0f1c;
  border-top: 1px solid var(--border-color);
  padding: 40px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}
.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--text-primary);
}
.footer-col p, .footer-col a {
  font-size: .85rem;
  color: var(--text-secondary);
  line-height: 2;
  display: block;
}
.footer-col a:hover { color: var(--primary-light); }
.footer-qr { display: flex; gap: 20px; margin-top: 10px; }
.footer-qr img { width: 100px; border-radius: 8px; }
.footer-qr-label { font-size: .75rem; color: var(--text-secondary); text-align: center; margin-top: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 16px 0;
  text-align: center;
  font-size: .8rem;
  color: var(--text-secondary);
}

/* ========== Breadcrumb ========== */
.breadcrumb {
  padding: 14px 0;
  font-size: .85rem;
  color: var(--text-secondary);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb span { margin: 0 8px; }

/* ========== Page Header ========== */
.page-header {
  background: linear-gradient(135deg, var(--bg-dark), var(--bg-card));
  padding: 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}
.page-header h1 { font-size: 2rem; font-weight: 700; margin-bottom: 10px; }
.page-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ========== Content Article ========== */
.article-content { max-width: 800px; margin: 0 auto; }
.article-content h2 { font-size: 1.4rem; margin: 30px 0 14px; color: var(--primary-light); }
.article-content h3 { font-size: 1.15rem; margin: 24px 0 10px; }
.article-content p { margin-bottom: 16px; color: var(--text-secondary); line-height: 1.8; }
.section-light .article-content p { color: var(--text-dark-secondary); }
.article-content ul { margin-bottom: 16px; padding-left: 20px; }
.article-content ul li { margin-bottom: 8px; color: var(--text-secondary); position: relative; padding-left: 16px; }
.article-content ul li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; background: var(--primary); border-radius: 50%; }

/* ========== Stats Bar ========== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
  padding: 30px 0;
}
.stat-item h3 { font-size: 2rem; font-weight: 800; color: var(--primary-light); }
.stat-item p { font-size: .85rem; color: var(--text-secondary); margin-top: 4px; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .header-inner { flex-wrap: wrap; }
  .main-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
    margin-top: 10px;
  }
  .main-nav.active { display: flex; }
  .main-nav a { padding: 10px 0; width: 100%; text-align: center; }
  .menu-toggle { display: block; }
  .hero h1 { font-size: 1.6rem; }
  .hero { min-height: 300px; }
  .hero-content { padding: 40px 20px; }
  .section { padding: 40px 0; }
  .section-title h2 { font-size: 1.4rem; }
  .video-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .page-header h1 { font-size: 1.5rem; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.3rem; }
  .stats-bar { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: center; }
}

/* ========== Lazy Load ========== */
img[loading="lazy"] { opacity: 0; transition: opacity .3s ease; }
img[loading="lazy"].loaded, img[loading="lazy"][src] { opacity: 1; }

/* ========== Animations ========== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp .5s ease forwards; }