/* ============================================
   色虎视频 - 原创样式表
   品牌：色虎视频 | 域名：wjiblex.cn
   配色方案：虎红+深夜蓝+暖橙
   ============================================ */

/* CSS Variables */
:root {
  --primary: #E84033;
  --primary-dark: #C0352A;
  --secondary: #1A1A2E;
  --accent: #FF6B35;
  --bg-dark: #0F0F1A;
  --bg-card: #1C1C30;
  --bg-card-hover: #252545;
  --text-main: #F5F5F5;
  --text-sub: #A0A0B8;
  --text-muted: #6B6B80;
  --gradient-main: linear-gradient(135deg, #E84033, #FF6B35);
  --gradient-dark: linear-gradient(180deg, #0F0F1A, #1A1A2E);
  --border-color: #2A2A45;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 32px rgba(232,64,51,0.2);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: all 0.3s ease;
  --max-width: 1280px;
}

/* 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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; }

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

/* ============ Header & Navigation ============ */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(15,15,26,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max-width); margin: 0 auto; padding: 0 20px; height: 68px;
}
.logo-wrap { display: flex; align-items: center; gap: 10px; }
.logo-wrap img { height: 42px; width: auto; }
.logo-text { font-size: 1.4rem; font-weight: 800; background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 8px 16px; border-radius: var(--radius-sm); color: var(--text-sub);
  font-size: 0.95rem; font-weight: 500; transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active { color: var(--text-main); background: rgba(232,64,51,0.12); }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text-main); font-size: 1.5rem; cursor: pointer; }

/* Search Bar */
.search-bar {
  max-width: var(--max-width); margin: 0 auto; padding: 12px 20px;
  background: rgba(28,28,48,0.6);
}
.search-wrap {
  display: flex; align-items: center; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: 50px; overflow: hidden;
  max-width: 680px; margin: 0 auto;
}
.search-wrap input {
  flex: 1; padding: 12px 20px; background: transparent; border: none;
  color: var(--text-main); font-size: 0.95rem; outline: none;
}
.search-wrap input::placeholder { color: var(--text-muted); }
.search-wrap button {
  padding: 12px 24px; background: var(--gradient-main); border: none;
  color: #fff; font-size: 0.95rem; cursor: pointer; transition: var(--transition);
}
.search-wrap button:hover { opacity: 0.9; }

/* ============ Hero Banner ============ */
.hero-section {
  position: relative; margin-top: 68px; overflow: hidden;
  min-height: 520px; display: flex; align-items: center;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(15,15,26,0.85), rgba(26,26,46,0.7));
}
.hero-content {
  position: relative; z-index: 1; max-width: var(--max-width);
  margin: 0 auto; padding: 80px 20px; text-align: center;
}
.hero-content h1 { font-size: 2.8rem; margin-bottom: 16px; }
.hero-content h1 span { background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-content p { font-size: 1.15rem; color: var(--text-sub); max-width: 640px; margin: 0 auto 32px; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; background: var(--gradient-main); color: #fff;
  border: none; border-radius: 50px; font-size: 1rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,64,51,0.35); color: #fff; }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; background: transparent; color: var(--text-main);
  border: 2px solid var(--border-color); border-radius: 50px;
  font-size: 1rem; font-weight: 600; cursor: pointer; transition: var(--transition);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ============ Section Common ============ */
.section { padding: 72px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 2rem; margin-bottom: 12px; }
.section-header h2 span { color: var(--primary); }
.section-header p { color: var(--text-sub); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }
.section-tag {
  display: inline-block; padding: 4px 14px; background: rgba(232,64,51,0.12);
  color: var(--primary); border-radius: 50px; font-size: 0.85rem; font-weight: 600;
  margin-bottom: 12px;
}

/* ============ Video Cards Grid ============ */
.video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.video-card {
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
  transition: var(--transition); cursor: pointer; border: 1px solid var(--border-color);
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.video-thumb {
  position: relative; overflow: hidden; aspect-ratio: 16/9;
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0.8);
  width: 56px; height: 56px; background: rgba(232,64,51,0.9); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition);
}
.play-btn::after {
  content: ''; width: 0; height: 0;
  border-left: 18px solid #fff; border-top: 11px solid transparent; border-bottom: 11px solid transparent;
  margin-left: 4px;
}
.video-card:hover .play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-info { padding: 14px 16px; }
.video-title { font-size: 0.95rem; 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: 0.8rem; color: var(--text-muted); }
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tag {
  position: absolute; top: 10px; left: 10px; padding: 3px 10px;
  background: var(--primary); color: #fff; border-radius: 4px;
  font-size: 0.75rem; font-weight: 600;
}
.video-duration {
  position: absolute; bottom: 10px; right: 10px; padding: 2px 8px;
  background: rgba(0,0,0,0.75); color: #fff; border-radius: 4px;
  font-size: 0.75rem;
}

/* ============ Feature Modules ============ */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 32px 24px; text-align: center;
  transition: var(--transition);
}
.feature-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: var(--gradient-main); border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}
.feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.feature-card p { color: var(--text-sub); font-size: 0.9rem; }

/* ============ AI Section ============ */
.ai-section { background: linear-gradient(135deg, rgba(28,28,48,0.8), rgba(15,15,26,0.9)); }
.ai-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.ai-image { border-radius: var(--radius-lg); overflow: hidden; }
.ai-image img { width: 100%; }
.ai-content h3 { font-size: 1.3rem; margin-bottom: 16px; color: var(--accent); }
.ai-content p { color: var(--text-sub); margin-bottom: 20px; }
.ai-features { display: flex; flex-direction: column; gap: 12px; }
.ai-feature-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  background: rgba(255,255,255,0.04); border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}
.ai-feature-item span { color: var(--text-sub); font-size: 0.9rem; }

/* ============ Expert Team ============ */
.expert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.expert-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 32px 24px; text-align: center;
  transition: var(--transition);
}
.expert-card:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); }
.expert-avatar {
  width: 100px; height: 100px; border-radius: 50%; margin: 0 auto 16px;
  overflow: hidden; border: 3px solid var(--primary);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-card h4 { font-size: 1.1rem; margin-bottom: 4px; }
.expert-role { color: var(--accent); font-size: 0.85rem; margin-bottom: 12px; }
.expert-desc { color: var(--text-sub); font-size: 0.85rem; margin-bottom: 16px; }
.expert-btns { display: flex; gap: 10px; justify-content: center; }
.btn-sm {
  padding: 8px 16px; font-size: 0.8rem; border-radius: 50px;
  border: 1px solid var(--border-color); color: var(--text-sub);
  background: transparent; cursor: pointer; transition: var(--transition);
}
.btn-sm:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm.filled { background: var(--gradient-main); border: none; color: #fff; }

/* ============ Partner Logos ============ */
.partner-wall {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 32px;
  align-items: center; padding: 20px 0;
}
.partner-logo {
  width: 120px; height: 60px; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 0.85rem; font-weight: 600;
  transition: var(--transition);
}
.partner-logo:hover { border-color: var(--primary); color: var(--text-main); }

/* ============ Reviews ============ */
.review-grid { display: grid; grid-template-columns: repeat(2, 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 { border-color: var(--primary); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--gradient-main); display: flex; align-items: center;
  justify-content: center; color: #fff; font-weight: 700; font-size: 1.1rem;
}
.review-name { font-weight: 600; font-size: 0.95rem; }
.review-date { font-size: 0.8rem; color: var(--text-muted); }
.review-stars { color: #FFB800; font-size: 0.9rem; margin-bottom: 8px; }
.review-text { color: var(--text-sub); font-size: 0.9rem; line-height: 1.6; }

/* ============ FAQ ============ */
.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;
}
.faq-question {
  padding: 18px 24px; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center;
  font-weight: 600; font-size: 0.95rem; transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-arrow { transition: transform 0.3s ease; font-size: 1.2rem; }
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
  padding: 0 24px; color: var(--text-sub); font-size: 0.9rem; line-height: 1.7;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ============ Contact Section ============ */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.contact-info-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 32px;
}
.contact-info-card h3 { font-size: 1.2rem; margin-bottom: 20px; color: var(--accent); }
.contact-item { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 16px; }
.contact-icon {
  width: 36px; height: 36px; background: rgba(232,64,51,0.12);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  color: var(--primary); font-size: 1rem; flex-shrink: 0;
}
.contact-label { font-size: 0.8rem; color: var(--text-muted); }
.contact-value { font-size: 0.95rem; color: var(--text-main); }
.qrcode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
.qrcode-item { text-align: center; }
.qrcode-item img { width: 140px; height: 140px; margin: 0 auto 8px; border-radius: var(--radius-sm); }
.qrcode-item p { font-size: 0.85rem; color: var(--text-sub); }

/* ============ How-To Guide ============ */
.howto-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.howto-step {
  text-align: center; padding: 24px 16px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); position: relative;
}
.step-number {
  width: 40px; height: 40px; background: var(--gradient-main);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 1.1rem; margin: 0 auto 14px;
}
.howto-step h4 { font-size: 0.95rem; margin-bottom: 8px; }
.howto-step p { font-size: 0.8rem; color: var(--text-sub); }

/* ============ Share Buttons ============ */
.share-bar { display: flex; gap: 12px; justify-content: center; padding: 20px 0; flex-wrap: wrap; }
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: 50px; font-size: 0.85rem;
  font-weight: 600; cursor: pointer; transition: var(--transition);
  border: 1px solid var(--border-color); color: var(--text-sub); background: var(--bg-card);
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ============ Footer ============ */
.site-footer {
  background: var(--secondary); border-top: 1px solid var(--border-color);
  padding: 48px 0 24px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer-brand .logo-wrap { margin-bottom: 12px; }
.footer-brand p { color: var(--text-sub); font-size: 0.85rem; line-height: 1.6; }
.footer-col h4 { font-size: 1rem; margin-bottom: 16px; color: var(--text-main); }
.footer-col a { display: block; color: var(--text-sub); font-size: 0.85rem; padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border-color); padding-top: 20px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.8rem; color: var(--text-muted); flex-wrap: wrap; gap: 12px;
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  padding: 16px 0; font-size: 0.85rem; color: var(--text-muted);
}
.breadcrumb a { color: var(--text-sub); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* ============ Page Banner ============ */
.page-banner {
  margin-top: 68px; padding: 60px 0; text-align: center;
  background: linear-gradient(135deg, rgba(28,28,48,0.9), rgba(15,15,26,0.95));
  position: relative; overflow: hidden;
}
.page-banner::before {
  content: ''; position: absolute; inset: 0;
  background-size: cover; background-position: center; opacity: 0.15;
}
.page-banner h1 { font-size: 2.2rem; margin-bottom: 12px; position: relative; z-index: 1; }
.page-banner p { color: var(--text-sub); font-size: 1.05rem; position: relative; z-index: 1; }

/* ============ Community Section ============ */
.community-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.community-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 28px; transition: var(--transition);
}
.community-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.community-card h4 { font-size: 1.05rem; margin-bottom: 10px; color: var(--accent); }
.community-card p { color: var(--text-sub); font-size: 0.9rem; }

/* ============ Lazy Load ============ */
/* 图片直接显示，无需懒加载透明度控制 */


/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; position: absolute; top: 68px; left: 0; width: 100%; background: var(--secondary); flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border-color); }
  .main-nav.active { display: flex; }
  .mobile-menu-btn { display: block; }
  .hero-content h1 { font-size: 1.8rem; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid, .expert-grid, .community-features { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: center; }
  .section { padding: 48px 0; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .hero-content h1 { font-size: 1.5rem; }
  .section-header h2 { font-size: 1.5rem; }
}


/* ============ Breadcrumb Bar ============ */
.breadcrumb-bar {
  background: var(--secondary); padding: 0; border-bottom: 1px solid var(--border-color);
}
.breadcrumb-bar .breadcrumb { padding: 10px 0; font-size: 0.82rem; }

/* ============ Stats Section ============ */
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center;
}
.stat-item { padding: 20px; }
.stat-number {
  font-size: 2.8rem; font-weight: 800;
  background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  line-height: 1.2; margin-bottom: 8px;
}
.stat-label { color: var(--text-sub); font-size: 0.9rem; }

/* ============ Hero Tags ============ */
.tag-item {
  display: inline-block; padding: 4px 14px; background: rgba(232,64,51,0.15);
  color: var(--primary); border-radius: 50px; font-size: 0.8rem; font-weight: 500;
  border: 1px solid rgba(232,64,51,0.3);
}

/* ============ News Grid ============ */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 28px; transition: var(--transition);
}
.news-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.news-date {
  display: inline-block; padding: 2px 10px; background: rgba(232,64,51,0.12);
  color: var(--primary); border-radius: 4px; font-size: 0.8rem; margin-bottom: 12px;
}
.news-card h4 { font-size: 1.05rem; margin-bottom: 10px; }
.news-card p { color: var(--text-sub); font-size: 0.88rem; line-height: 1.6; margin-bottom: 12px; }
.news-link { color: var(--accent); font-size: 0.85rem; font-weight: 600; }
.news-link:hover { color: var(--primary); }

/* ============ Expert Credentials ============ */
.expert-credentials { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; justify-content: center; }
.credential-tag {
  display: inline-block; padding: 2px 10px; background: rgba(255,107,53,0.12);
  color: var(--accent); border-radius: 50px; font-size: 0.72rem; border: 1px solid rgba(255,107,53,0.25);
}

/* ============ Trust Bar ============ */
.trust-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.trust-item {
  text-align: center; padding: 20px;
  background: var(--bg-card); border-radius: var(--radius-sm); border: 1px solid var(--border-color);
}
.trust-item h6 { font-size: 0.9rem; margin-bottom: 8px; color: var(--text-main); }
.trust-item p { color: var(--text-sub); font-size: 0.8rem; line-height: 1.5; }

/* ============ Video Description ============ */
.video-desc {
  color: var(--text-sub); font-size: 0.82rem; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

/* ============ Responsive Additions ============ */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .trust-bar { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: 1fr; }
  .trust-bar { grid-template-columns: 1fr 1fr; }
  .stat-number { font-size: 2rem; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .trust-bar { grid-template-columns: 1fr; }
}