/* ============================================
   母狗 影视传媒 · 视频社区 - 原创样式表
   品牌：母狗 | 域名：5ww.com.cn
   配色：深紫黑 + 活力橙 + 科技青绿
   ============================================ */

/* CSS Variables */
:root {
  --primary: #1A0A2E;
  --secondary: #FF6B35;
  --accent: #00D4AA;
  --bg-dark: #0D0D1A;
  --bg-card: #1E1E3A;
  --text-main: #F0F0F5;
  --text-sub: #9B9BB0;
  --gradient-warm: linear-gradient(135deg, #FF6B35, #FF3CAC);
  --gradient-cool: linear-gradient(135deg, #00D4AA, #1A0A2E);
  --gradient-hero: linear-gradient(180deg, rgba(13,13,26,0) 0%, rgba(13,13,26,0.85) 100%);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 20px rgba(255,107,53,0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --max-width: 1280px;
}

/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--secondary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
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 & NAV ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,13,26,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,107,53,0.15);
  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-link { display: flex; align-items: center; gap: 10px; }
.logo-img { height: 40px; width: auto; border-radius: 6px; }
.logo-text { font-size: 1.5rem; font-weight: 800; background: var(--gradient-warm); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px; border-radius: var(--radius-sm); font-size: 0.9rem;
  color: var(--text-sub); font-weight: 500; transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active { color: var(--text-main); background: rgba(255,107,53,0.12); }

/* Search Box */
.search-wrap {
  position: relative; width: 100%; max-width: var(--max-width); margin: 0 auto;
  padding: 10px 20px; background: rgba(30,30,58,0.6);
}
.search-box {
  display: flex; align-items: center; background: var(--bg-card);
  border: 1px solid rgba(255,107,53,0.2); border-radius: 50px;
  padding: 6px 6px 6px 20px; max-width: 600px; margin: 0 auto;
  transition: var(--transition);
}
.search-box:focus-within { border-color: var(--secondary); box-shadow: var(--shadow-glow); }
.search-box input {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--text-main); font-size: 0.9rem; padding: 6px 0;
}
.search-box input::placeholder { color: var(--text-sub); }
.search-btn {
  background: var(--gradient-warm); border: none; color: #fff;
  padding: 8px 20px; border-radius: 50px; cursor: pointer;
  font-size: 0.85rem; font-weight: 600; transition: var(--transition);
}
.search-btn:hover { transform: scale(1.05); box-shadow: var(--shadow-glow); }

/* Mobile Menu Toggle */
.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 32px; height: 32px; position: relative;
}
.menu-toggle span {
  display: block; width: 24px; height: 2px; background: var(--text-main);
  position: absolute; left: 4px; transition: var(--transition);
}
.menu-toggle span:nth-child(1) { top: 8px; }
.menu-toggle span:nth-child(2) { top: 15px; }
.menu-toggle span:nth-child(3) { top: 22px; }

/* ============ HERO BANNER ============ */
.hero-section {
  position: relative; min-height: 85vh; display: flex; align-items: center;
  justify-content: center; overflow: hidden; margin-top: 68px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center; background-repeat: no-repeat;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: var(--gradient-hero);
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 800px; padding: 40px 20px;
}
.hero-content h1 {
  font-size: 3rem; margin-bottom: 16px;
  background: var(--gradient-warm); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-content h1 span { display: block; font-size: 1.2rem; color: var(--text-sub); -webkit-text-fill-color: var(--text-sub); margin-top: 8px; }
.hero-desc { font-size: 1.1rem; color: var(--text-sub); margin-bottom: 28px; line-height: 1.8; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 32px; }
.hero-tags span {
  padding: 6px 16px; border-radius: 50px; font-size: 0.82rem;
  background: rgba(255,107,53,0.12); color: var(--secondary);
  border: 1px solid rgba(255,107,53,0.25);
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 32px; border-radius: 50px; font-weight: 600;
  background: var(--gradient-warm); color: #fff; font-size: 0.95rem;
  transition: var(--transition); border: none; cursor: pointer;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); color: #fff; }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 32px; border-radius: 50px; font-weight: 600;
  background: transparent; color: var(--accent); font-size: 0.95rem;
  border: 2px solid var(--accent); transition: var(--transition); cursor: pointer;
}
.btn-outline:hover { background: var(--accent); color: var(--bg-dark); }

/* ============ SECTIONS ============ */
.section { padding: 80px 0; }
.section-alt { background: rgba(30,30,58,0.3); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: 2rem; margin-bottom: 12px; position: relative; display: inline-block;
}
.section-header h2::after {
  content: ''; display: block; width: 60px; height: 3px;
  background: var(--gradient-warm); margin: 12px auto 0; border-radius: 2px;
}
.section-header p { color: var(--text-sub); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* ============ VIDEO CARDS ============ */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card); border-radius: var(--radius);
  overflow: hidden; transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.05);
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); border-color: rgba(255,107,53,0.2); }
.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: var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0);
  width: 60px; height: 60px; border-radius: 50%;
  background: rgba(255,107,53,0.9); display: flex; align-items: center; justify-content: center;
  transition: var(--transition); z-index: 2;
}
.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 { transform: translate(-50%, -50%) scale(1); }
.video-duration {
  position: absolute; bottom: 8px; right: 8px; background: rgba(0,0,0,0.75);
  color: #fff; padding: 2px 8px; border-radius: 4px; font-size: 0.75rem;
}
.video-info { padding: 16px; }
.video-info h3 { font-size: 1rem; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; align-items: center; gap: 16px; color: var(--text-sub); font-size: 0.8rem; }
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.video-tags span {
  padding: 2px 10px; border-radius: 50px; font-size: 0.72rem;
  background: rgba(0,212,170,0.1); color: var(--accent);
}

/* ============ FEATURE GRID ============ */
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 32px 24px;
  text-align: center; transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.05);
}
.feature-card:hover { transform: translateY(-4px); border-color: rgba(255,107,53,0.2); }
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: var(--gradient-warm); border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}
.feature-icon.green { background: var(--gradient-cool); }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.feature-card p { color: var(--text-sub); font-size: 0.9rem; }

/* ============ EXPERT SECTION ============ */
.expert-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 28px;
  text-align: center; transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.05);
}
.expert-card:hover { border-color: rgba(255,107,53,0.3); }
.expert-avatar {
  width: 100px; height: 100px; border-radius: 50%; margin: 0 auto 16px;
  object-fit: cover; border: 3px solid rgba(255,107,53,0.3);
}
.expert-card h3 { font-size: 1.05rem; margin-bottom: 4px; }
.expert-card .role { color: var(--secondary); font-size: 0.85rem; margin-bottom: 10px; }
.expert-card .bio { color: var(--text-sub); font-size: 0.85rem; margin-bottom: 16px; }
.expert-actions { display: flex; gap: 10px; justify-content: center; }
.expert-actions a {
  padding: 6px 16px; border-radius: 50px; font-size: 0.8rem; font-weight: 500;
}
.expert-actions .btn-sm-primary { background: var(--gradient-warm); color: #fff; }
.expert-actions .btn-sm-outline { border: 1px solid var(--accent); color: var(--accent); }
.expert-actions .btn-sm-outline:hover { background: var(--accent); color: var(--bg-dark); }

/* ============ BRAND WALL ============ */
.brand-wall {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 32px;
  align-items: center; padding: 20px 0;
}
.brand-wall img { height: 50px; opacity: 0.6; transition: var(--transition); filter: grayscale(100%); }
.brand-wall img:hover { opacity: 1; filter: grayscale(0%); }

/* ============ FAQ ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border-radius: var(--radius); margin-bottom: 12px;
  border: 1px solid rgba(255,255,255,0.05); 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(--secondary); }
.faq-question::after {
  content: '+'; font-size: 1.4rem; color: var(--secondary);
  transition: var(--transition); flex-shrink: 0; margin-left: 16px;
}
.faq-item.active .faq-question::after { content: '-'; }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
}
.faq-answer-inner { padding: 0 24px 18px; color: var(--text-sub); font-size: 0.9rem; line-height: 1.8; }
.faq-item.active .faq-answer { max-height: 300px; }

/* ============ REVIEWS ============ */
.review-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 24px;
  border: 1px solid rgba(255,255,255,0.05); transition: var(--transition);
}
.review-card:hover { border-color: rgba(0,212,170,0.2); }
.review-stars { color: #FFD700; margin-bottom: 12px; font-size: 0.9rem; letter-spacing: 2px; }
.review-text { color: var(--text-sub); font-size: 0.9rem; margin-bottom: 16px; line-height: 1.7; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-author-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gradient-warm); display: flex; align-items: center;
  justify-content: center; color: #fff; font-weight: 700; font-size: 0.9rem;
}
.review-author-info .name { font-size: 0.9rem; font-weight: 600; }
.review-author-info .date { font-size: 0.75rem; color: var(--text-sub); }

/* ============ FOOTER ============ */
.site-footer {
  background: var(--primary); border-top: 1px solid rgba(255,107,53,0.15);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px; margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 1rem; margin-bottom: 16px; color: var(--text-main);
  position: relative; padding-bottom: 10px;
}
.footer-col h4::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 30px; height: 2px; background: var(--secondary);
}
.footer-col p, .footer-col a { color: var(--text-sub); font-size: 0.85rem; }
.footer-col a { display: block; padding: 4px 0; }
.footer-col a:hover { color: var(--secondary); padding-left: 4px; }
.footer-qr { display: flex; gap: 20px; margin-top: 12px; }
.footer-qr img { width: 100px; height: 100px; border-radius: var(--radius-sm); }
.footer-qr-label { text-align: center; font-size: 0.75rem; color: var(--text-sub); margin-top: 6px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-logo img { height: 36px; border-radius: 6px; }
.footer-logo span { font-size: 1.3rem; font-weight: 800; background: var(--gradient-warm); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0; text-align: center;
  color: var(--text-sub); font-size: 0.8rem;
}
.footer-bottom a { color: var(--text-sub); }
.footer-bottom a:hover { color: var(--secondary); }

/* Social Share */
.share-bar { display: flex; gap: 12px; justify-content: center; margin: 20px 0; flex-wrap: wrap; }
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 50px; font-size: 0.82rem;
  background: var(--bg-card); color: var(--text-sub);
  border: 1px solid rgba(255,255,255,0.08); transition: var(--transition);
  cursor: pointer;
}
.share-btn:hover { border-color: var(--secondary); color: var(--secondary); }

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

/* ============ INNER PAGE ============ */
.inner-hero {
  position: relative; padding: 120px 0 60px; text-align: center;
  background-size: cover; background-position: center;
}
.inner-hero::after {
  content: ''; position: absolute; inset: 0;
  background: rgba(13,13,26,0.85);
}
.inner-hero .container { position: relative; z-index: 2; }
.inner-hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.inner-hero p { color: var(--text-sub); max-width: 600px; margin: 0 auto; }

.content-section { padding: 60px 0; }
.content-section h2 { font-size: 1.6rem; margin-bottom: 20px; }
.content-section h3 { font-size: 1.2rem; margin: 24px 0 12px; color: var(--secondary); }
.content-section p { color: var(--text-sub); margin-bottom: 16px; line-height: 1.8; }

/* ============ CONTACT INFO ============ */
.contact-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 28px;
  border: 1px solid rgba(255,255,255,0.05); text-align: center;
}
.contact-card h3 { font-size: 1rem; margin-bottom: 12px; }
.contact-card p { color: var(--text-sub); font-size: 0.9rem; }

/* ============ STATS BAR ============ */
.stats-bar {
  display: flex; justify-content: center; gap: 48px; padding: 40px 0;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 2.4rem; font-weight: 800;
  background: var(--gradient-warm); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label { color: var(--text-sub); font-size: 0.85rem; margin-top: 4px; }

/* ============ HOW-TO GUIDE ============ */
.howto-steps {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px; counter-reset: step;
}
.howto-step {
  background: var(--bg-card); border-radius: var(--radius); padding: 28px;
  position: relative; border: 1px solid rgba(255,255,255,0.05);
  counter-increment: step;
}
.howto-step::before {
  content: counter(step); position: absolute; top: -12px; left: 24px;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--gradient-warm); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem;
}
.howto-step h4 { margin-bottom: 8px; font-size: 1rem; margin-top: 8px; }
.howto-step p { color: var(--text-sub); font-size: 0.85rem; }

/* ============ SIDEBAR MODULES ============ */
.sidebar-module {
  background: var(--bg-card); border-radius: var(--radius); padding: 24px;
  margin-bottom: 24px; border: 1px solid rgba(255,255,255,0.05);
}
.sidebar-module h3 {
  font-size: 1rem; margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-video-list { display: flex; flex-direction: column; gap: 12px; }
.sidebar-video-item {
  display: flex; gap: 12px; align-items: center;
  padding: 8px; border-radius: var(--radius-sm);
  transition: var(--transition); cursor: pointer;
}
.sidebar-video-item:hover { background: rgba(255,107,53,0.08); }
.sidebar-video-thumb {
  width: 80px; height: 50px; border-radius: 6px;
  overflow: hidden; flex-shrink: 0; position: relative;
}
.sidebar-video-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-video-info h4 { font-size: 0.82rem; margin-bottom: 4px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sidebar-video-info span { font-size: 0.72rem; color: var(--text-sub); }

/* ============ LAZY LOAD ============ */
img[loading="lazy"] { opacity: 0; transition: opacity 0.5s ease; }
img[loading="lazy"].loaded, img[loading="lazy"][src] { opacity: 1; }

/* ============ BACK TO TOP ============ */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px; width: 44px; height: 44px;
  border-radius: 50%; background: var(--gradient-warm); color: #fff;
  display: none; align-items: center; justify-content: center;
  cursor: pointer; z-index: 999; border: none; font-size: 1.2rem;
  transition: var(--transition); box-shadow: var(--shadow-glow);
}
.back-to-top:hover { transform: translateY(-3px); }
.back-to-top.visible { display: flex; }

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .hero-content h1 { font-size: 2rem; }
  .hero-content h1 span { font-size: 1rem; }
  .section { padding: 50px 0; }
  .section-header h2 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .stats-bar { gap: 24px; }
  .stat-num { font-size: 1.8rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  .main-nav {
    position: fixed; top: 68px; left: 0; right: 0;
    background: rgba(13,13,26,0.98); flex-direction: column;
    padding: 20px; gap: 4px; transform: translateY(-120%);
    transition: var(--transition); backdrop-filter: blur(16px);
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { padding: 12px 16px; width: 100%; }
  .menu-toggle { display: block; }
  .hero-section { min-height: 70vh; }
  .inner-hero { padding: 100px 0 40px; }
  .inner-hero h1 { font-size: 1.6rem; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.6rem; }
  .hero-btns { flex-direction: column; align-items: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-qr { justify-content: center; }
  .header-inner { height: 56px; }
  .hero-section { margin-top: 56px; }
}

/* ============ ANIMATIONS ============ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }

/* Two Column Layout */
.two-col-layout {
  display: grid; grid-template-columns: 1fr 340px; gap: 32px;
}
@media (max-width: 960px) {
  .two-col-layout { grid-template-columns: 1fr; }
}

/* MCP Frontend Placeholder */
.mcp-widget {
  background: var(--bg-card); border-radius: var(--radius); padding: 20px;
  border: 1px solid rgba(0,212,170,0.2); text-align: center;
  margin: 20px 0;
}
.mcp-widget h4 { color: var(--accent); margin-bottom: 8px; }
.mcp-widget p { color: var(--text-sub); font-size: 0.85rem; }
.mcp-status { display: inline-block; padding: 4px 12px; border-radius: 50px; font-size: 0.75rem; background: rgba(0,212,170,0.15); color: var(--accent); margin-top: 8px; }