/* ============================================
   色虎视频 - 原创样式表
   品牌：色虎视频 | shushsb.cn
   配色：虎红 #E84530 / 深夜蓝 #1A1A2E / 琥珀橙 #FF8C42
   ============================================ */

/* --- CSS Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: #0F0F1A;
  color: #F0F0F5;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #FF8C42; text-decoration: none; transition: color .3s; }
a:hover { color: #E84530; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* --- Header / Navigation --- */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(15,15,26,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(232,69,48,.15);
  transition: background .3s;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 20px; height: 68px;
}
.site-logo { display: flex; align-items: center; gap: 10px; }
.site-logo img { height: 42px; width: auto; }
.site-logo span {
  font-size: 1.3rem; font-weight: 700;
  background: linear-gradient(135deg, #E84530, #FF8C42);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  color: #A0A0B8; font-size: .95rem; padding: 8px 14px;
  border-radius: 6px; transition: all .3s;
}
.main-nav a:hover, .main-nav a.active {
  color: #F0F0F5; background: rgba(232,69,48,.12);
}
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: #F0F0F5;
  margin: 5px 0; transition: .3s;
}

/* --- Search Bar --- */
.search-bar {
  max-width: 1200px; margin: 0 auto; padding: 12px 20px;
  background: rgba(28,28,48,.6);
}
.search-bar form {
  display: flex; max-width: 600px; margin: 0 auto;
  background: #1C1C30; border: 1px solid rgba(232,69,48,.25);
  border-radius: 30px; overflow: hidden;
}
.search-bar input {
  flex: 1; padding: 10px 20px; background: transparent;
  border: none; color: #F0F0F5; font-size: .95rem; outline: none;
}
.search-bar input::placeholder { color: #6B6B80; }
.search-bar button {
  padding: 10px 24px; background: linear-gradient(135deg, #E84530, #FF8C42);
  border: none; color: #fff; font-size: .95rem; cursor: pointer;
  transition: opacity .3s;
}
.search-bar button:hover { opacity: .85; }

/* --- Hero Banner --- */
.hero {
  position: relative; margin-top: 68px;
  height: 520px; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  filter: brightness(.45);
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  padding: 0 20px; max-width: 800px;
}
.hero-content h1 {
  font-size: 2.8rem; font-weight: 800; margin-bottom: 16px;
  background: linear-gradient(135deg, #F0F0F5, #FF8C42);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.15rem; color: #C8C8D8; margin-bottom: 28px; line-height: 1.8;
}
.hero-btn {
  display: inline-block; padding: 14px 36px;
  background: linear-gradient(135deg, #E84530, #FF8C42);
  color: #fff; font-size: 1.05rem; font-weight: 600;
  border-radius: 30px; transition: transform .3s, box-shadow .3s;
}
.hero-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232,69,48,.4);
  color: #fff;
}

/* --- Section Common --- */
.section {
  padding: 70px 0;
}
.section-alt {
  background: rgba(28,28,48,.4);
}
.section-title {
  text-align: center; margin-bottom: 50px;
}
.section-title h2 {
  font-size: 2rem; font-weight: 700; margin-bottom: 12px;
  color: #F0F0F5;
}
.section-title h2 span {
  background: linear-gradient(135deg, #E84530, #FF8C42);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-title p {
  color: #A0A0B8; font-size: 1rem; max-width: 600px; margin: 0 auto;
}

/* --- Video Card Grid --- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #1C1C30;
  border-radius: 12px;
  overflow: hidden;
  transition: transform .3s, box-shadow .3s;
  border: 1px solid rgba(232,69,48,.08);
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(232,69,48,.15);
}
.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
}
.video-thumb img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s;
}
.video-card:hover .video-thumb img {
  transform: scale(1.06);
}
.play-btn {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 60px; height: 60px;
  background: rgba(232,69,48,.9);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: transform .3s;
  z-index: 3;
}
.play-btn::after {
  content: '';
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}
.video-card:hover .play-btn {
  transform: translate(-50%, -50%) scale(1);
}
.video-info {
  padding: 16px;
}
.video-info h3 {
  font-size: 1rem; font-weight: 600; margin-bottom: 8px;
  color: #F0F0F5;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.video-meta {
  display: flex; gap: 16px; font-size: .82rem; color: #6B6B80;
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tag {
  display: inline-block; padding: 3px 10px; margin-top: 8px;
  background: rgba(232,69,48,.12); color: #E84530;
  border-radius: 12px; font-size: .78rem;
}

/* --- Service / Feature Cards --- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: #1C1C30;
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  border: 1px solid rgba(232,69,48,.08);
  transition: transform .3s, border-color .3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(232,69,48,.3);
}
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(232,69,48,.15), rgba(255,140,66,.15));
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}
.feature-card h3 {
  font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; color: #F0F0F5;
}
.feature-card p {
  font-size: .9rem; color: #A0A0B8; line-height: 1.6;
}

/* --- Expert Team --- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: #1C1C30;
  border-radius: 12px;
  padding: 28px 20px;
  text-align: center;
  border: 1px solid rgba(232,69,48,.08);
  transition: transform .3s;
}
.expert-card:hover { transform: translateY(-4px); }
.expert-avatar {
  width: 100px; height: 100px; border-radius: 50%;
  margin: 0 auto 16px; overflow: hidden;
  border: 3px solid rgba(232,69,48,.3);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-card h3 { font-size: 1.05rem; font-weight: 600; color: #F0F0F5; margin-bottom: 4px; }
.expert-card .expert-role { font-size: .85rem; color: #FF8C42; margin-bottom: 10px; }
.expert-card p { font-size: .85rem; color: #A0A0B8; line-height: 1.5; margin-bottom: 14px; }
.expert-links { display: flex; justify-content: center; gap: 10px; }
.expert-links a {
  padding: 6px 16px; font-size: .82rem; border-radius: 20px;
  border: 1px solid rgba(232,69,48,.3); color: #E84530;
  transition: all .3s;
}
.expert-links a:hover {
  background: #E84530; color: #fff;
}

/* --- Partner Logo Wall --- */
.partner-wall {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 30px; align-items: center;
}
.partner-item {
  padding: 16px 28px;
  background: #1C1C30;
  border-radius: 10px;
  font-size: 1rem; font-weight: 600;
  color: #6B6B80;
  border: 1px solid rgba(232,69,48,.08);
  transition: all .3s;
}
.partner-item:hover {
  color: #FF8C42; border-color: rgba(255,140,66,.3);
}

/* --- Reviews --- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: #1C1C30;
  border-radius: 12px;
  padding: 24px;
  border: 1px solid rgba(232,69,48,.08);
}
.review-stars { color: #FF8C42; margin-bottom: 12px; font-size: 1rem; letter-spacing: 2px; }
.review-card p { font-size: .92rem; color: #C8C8D8; line-height: 1.6; margin-bottom: 14px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-author-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, #E84530, #FF8C42);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: .9rem;
}
.review-author-info span { display: block; }
.review-author-info .author-name { font-size: .9rem; font-weight: 600; color: #F0F0F5; }
.review-author-info .author-date { font-size: .78rem; color: #6B6B80; }

/* --- FAQ --- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: #1C1C30;
  border-radius: 10px;
  margin-bottom: 12px;
  border: 1px solid rgba(232,69,48,.08);
  overflow: hidden;
}
.faq-question {
  padding: 18px 24px;
  cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 1rem; font-weight: 600; color: #F0F0F5;
  transition: background .3s;
}
.faq-question:hover { background: rgba(232,69,48,.06); }
.faq-question::after {
  content: '+'; font-size: 1.4rem; color: #E84530;
  transition: transform .3s;
}
.faq-item.active .faq-question::after {
  content: '−';
}
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height .4s ease;
}
.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: .92rem; color: #A0A0B8; line-height: 1.7;
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.contact-card {
  background: #1C1C30;
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  border: 1px solid rgba(232,69,48,.08);
}
.contact-card h3 { font-size: 1.05rem; font-weight: 600; color: #F0F0F5; margin-bottom: 12px; }
.contact-card p { font-size: .9rem; color: #A0A0B8; line-height: 1.6; }
.contact-card img { max-width: 160px; margin: 12px auto 0; border-radius: 8px; }

/* --- How-To Guide --- */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: #1C1C30;
  border-radius: 12px;
  padding: 28px 20px;
  text-align: center;
  border: 1px solid rgba(232,69,48,.08);
  position: relative;
}
.howto-step::before {
  counter-increment: step;
  content: counter(step);
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; margin: 0 auto 16px;
  background: linear-gradient(135deg, #E84530, #FF8C42);
  border-radius: 50%; color: #fff; font-weight: 700; font-size: 1.1rem;
}
.howto-step h4 { font-size: 1rem; font-weight: 600; color: #F0F0F5; margin-bottom: 8px; }
.howto-step p { font-size: .85rem; color: #A0A0B8; }

/* --- Footer --- */
.site-footer {
  background: #0A0A14;
  border-top: 1px solid rgba(232,69,48,.1);
  padding: 50px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 1rem; font-weight: 600; color: #F0F0F5;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #E84530;
  display: inline-block;
}
.footer-col p, .footer-col a {
  font-size: .88rem; color: #6B6B80; line-height: 2;
}
.footer-col a:hover { color: #FF8C42; }
.footer-col img { max-width: 120px; border-radius: 6px; margin-top: 8px; }
.footer-qr { display: flex; gap: 16px; }
.footer-qr div { text-align: center; }
.footer-qr img { width: 100px; height: 100px; }
.footer-qr span { display: block; font-size: .78rem; color: #6B6B80; margin-top: 6px; }
.social-share { display: flex; gap: 12px; margin-top: 12px; }
.social-share a {
  width: 36px; height: 36px;
  background: rgba(232,69,48,.12);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #E84530; font-size: .85rem; font-weight: 700;
  transition: all .3s;
}
.social-share a:hover { background: #E84530; color: #fff; }
.footer-bottom {
  text-align: center; padding: 20px 0;
  border-top: 1px solid rgba(232,69,48,.08);
  font-size: .82rem; color: #6B6B80;
}
.footer-bottom a { color: #6B6B80; }
.footer-bottom a:hover { color: #FF8C42; }

/* --- Breadcrumb --- */
.breadcrumb {
  padding: 16px 0;
  font-size: .85rem; color: #6B6B80;
}
.breadcrumb a { color: #A0A0B8; }
.breadcrumb a:hover { color: #FF8C42; }
.breadcrumb span { margin: 0 8px; }

/* --- Inner Page Hero --- */
.page-hero {
  margin-top: 68px;
  padding: 60px 0 40px;
  background: linear-gradient(135deg, rgba(232,69,48,.08), rgba(255,140,66,.05));
  text-align: center;
}
.page-hero h1 {
  font-size: 2.2rem; font-weight: 700; color: #F0F0F5; margin-bottom: 12px;
}
.page-hero p {
  font-size: 1rem; color: #A0A0B8; max-width: 600px; margin: 0 auto;
}

/* --- Content Article --- */
.article-content {
  max-width: 800px; margin: 0 auto;
  padding: 40px 20px;
}
.article-content h2 {
  font-size: 1.6rem; font-weight: 700; color: #F0F0F5;
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(232,69,48,.2);
}
.article-content h3 {
  font-size: 1.2rem; font-weight: 600; color: #F0F0F5;
  margin: 24px 0 12px;
}
.article-content p {
  font-size: .95rem; color: #C8C8D8; line-height: 1.8;
  margin-bottom: 16px;
}

/* --- Lazy Load Placeholder --- */
.lazy-img {
  background: #1C1C30;
  transition: opacity .5s;
}
.lazy-img[data-src] { opacity: .6; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .main-nav {
    position: fixed; top: 68px; left: 0; right: 0;
    background: rgba(15,15,26,.98);
    flex-direction: column;
    padding: 20px;
    transform: translateY(-120%);
    transition: transform .3s;
  }
  .main-nav.open { transform: translateY(0); }
  .nav-toggle { display: block; }
  .hero { height: 400px; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-content p { font-size: 1rem; }
  .section { padding: 50px 0; }
  .section-title h2 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .header-inner { height: 58px; }
  .hero { margin-top: 58px; }
  .main-nav { top: 58px; }
}
@media (max-width: 480px) {
  .hero { height: 320px; }
  .hero-content h1 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-qr { flex-direction: column; align-items: center; }
}

/* --- Utility --- */
.text-gradient {
  background: linear-gradient(135deg, #E84530, #FF8C42);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.mb-0 { margin-bottom: 0; }
.mt-20 { margin-top: 20px; }
.text-center { text-align: center; }

/* --- Latest Updates / News --- */
.news-list { max-width: 800px; margin: 0 auto; }
.news-item {
  display: flex; gap: 20px; align-items: flex-start;
  background: #1C1C30; border-radius: 10px; padding: 20px;
  margin-bottom: 14px; border: 1px solid rgba(232,69,48,.08);
  transition: transform .3s;
}
.news-item:hover { transform: translateX(4px); }
.news-date {
  min-width: 70px; text-align: center;
  background: linear-gradient(135deg, rgba(232,69,48,.15), rgba(255,140,66,.15));
  border-radius: 8px; padding: 10px 8px;
}
.news-date .day { display: block; font-size: 1.6rem; font-weight: 700; color: #E84530; }
.news-date .month { display: block; font-size: .75rem; color: #A0A0B8; }
.news-body h4 { font-size: 1rem; font-weight: 600; color: #F0F0F5; margin-bottom: 6px; }
.news-body p { font-size: .88rem; color: #A0A0B8; line-height: 1.6; }

/* --- Stats Counter --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px; text-align: center;
}
.stat-card {
  background: #1C1C30; border-radius: 12px; padding: 28px 16px;
  border: 1px solid rgba(232,69,48,.08);
}
.stat-number {
  font-size: 2.2rem; font-weight: 800;
  background: linear-gradient(135deg, #E84530, #FF8C42);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: .9rem; color: #A0A0B8; margin-top: 6px; }

/* --- Awards / Certifications --- */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.award-card {
  background: #1C1C30; border-radius: 10px; padding: 24px 18px;
  text-align: center; border: 1px solid rgba(232,69,48,.08);
}
.award-card .award-icon { font-size: 2rem; margin-bottom: 12px; }
.award-card h4 { font-size: .95rem; font-weight: 600; color: #F0F0F5; margin-bottom: 6px; }
.award-card p { font-size: .82rem; color: #A0A0B8; }