/* ============================================
   小马拉大车 - 汽车改装视频社区 | wyj363.cn
   原创CSS样式 v1.0
   ============================================ */

/* CSS Variables */
:root {
  --midnight: #0a1628;
  --midnight-light: #121f36;
  --flame: #ff6b35;
  --flame-dark: #e55a2b;
  --flame-light: #ff8c5a;
  --titanium: #2d3436;
  --glacier: #f8f9fa;
  --steel: #636e72;
  --silver: #b2bec3;
  --carbon: #1a1a2e;
  --neon-blue: #00d4ff;
  --success: #00b894;
  --warning: #fdcb6e;
  --gradient-hero: linear-gradient(135deg, #0a1628 0%, #1a1a2e 50%, #0a1628 100%);
  --gradient-flame: linear-gradient(135deg, #ff6b35 0%, #e55a2b 100%);
  --gradient-card: linear-gradient(180deg, rgba(10,22,40,0) 0%, rgba(10,22,40,0.95) 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.15);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.25);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.35);
  --shadow-flame: 0 4px 20px rgba(255,107,53,0.3);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 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", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--midnight);
  color: var(--glacier);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--flame); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--flame-light); }
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; color: var(--glacier); }

/* Container */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1440px; margin: 0 auto; padding: 0 20px; }

/* ============================================
   Header & Navigation
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,107,53,0.15);
  transition: var(--transition);
}
.site-header.scrolled {
  background: rgba(10, 22, 40, 0.98);
  box-shadow: var(--shadow-md);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px;
}
.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-link img {
  height: 42px;
  width: auto;
}
.logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--glacier);
  letter-spacing: 1px;
}
.logo-text span { color: var(--flame); }

/* Main Nav */
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  color: var(--silver);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--glacier);
  background: rgba(255,107,53,0.12);
}
.main-nav a.active { color: var(--flame); }

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.menu-toggle span {
  width: 26px;
  height: 2px;
  background: var(--glacier);
  transition: var(--transition);
  border-radius: 2px;
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Search Bar */
.search-bar {
  background: var(--midnight-light);
  border-bottom: 1px solid rgba(255,107,53,0.1);
  padding: 12px 0;
  margin-top: 72px;
}
.search-bar-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}
.search-bar input {
  width: 100%;
  padding: 12px 50px 12px 20px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,107,53,0.2);
  border-radius: var(--radius-xl);
  color: var(--glacier);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}
.search-bar input::placeholder { color: var(--steel); }
.search-bar input:focus {
  border-color: var(--flame);
  background: rgba(255,255,255,0.1);
  box-shadow: 0 0 0 3px rgba(255,107,53,0.15);
}
.search-bar button {
  position: absolute;
  right: 28px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--flame);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 6px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,22,40,0.5) 0%, rgba(10,22,40,0.85) 70%, var(--midnight) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 24px;
  margin: 0 auto;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,107,53,0.15);
  border: 1px solid rgba(255,107,53,0.3);
  padding: 6px 18px;
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  color: var(--flame-light);
  margin-bottom: 24px;
}
.hero-badge::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--flame);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 900;
  margin-bottom: 20px;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--glacier) 0%, var(--flame-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.15rem;
  color: var(--silver);
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 48px;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--flame);
}
.hero-stat .label {
  font-size: 0.85rem;
  color: var(--steel);
  margin-top: 4px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-xl);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient-flame);
  color: #fff;
  box-shadow: var(--shadow-flame);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(255,107,53,0.45);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--glacier);
  border: 2px solid rgba(255,255,255,0.2);
}
.btn-outline:hover {
  border-color: var(--flame);
  color: var(--flame);
  background: rgba(255,107,53,0.08);
}
.btn-sm { padding: 10px 22px; font-size: 0.9rem; }

/* ============================================
   Section Styles
   ============================================ */
.section {
  padding: 80px 0;
  position: relative;
}
.section-dark { background: var(--carbon); }
.section-gradient { background: var(--gradient-hero); }
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header .tag {
  display: inline-block;
  color: var(--flame);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
}
.section-header p {
  color: var(--steel);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Video Card Grid
   ============================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.video-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--midnight-light);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid rgba(255,255,255,0.06);
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(255,107,53,0.3);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.video-thumb video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.video-thumb img,
.video-thumb .video-poster {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  z-index: 1;
}
.video-card:hover .video-thumb img,
.video-card:hover .video-thumb .video-poster { transform: scale(1.08); }
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 64px;
  height: 64px;
  background: rgba(255,107,53,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.video-play-btn::after {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 0.78rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 500;
}
.video-info { padding: 16px; }
.video-info h4 {
  font-size: 1rem;
  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: 16px;
  font-size: 0.82rem;
  color: var(--steel);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--gradient-flame);
  color: #fff;
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* ============================================
   Feature Cards
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--midnight-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}
.feature-card:hover {
  border-color: rgba(255,107,53,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,107,53,0.12);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--flame);
}
.feature-card h4 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}
.feature-card p {
  color: var(--steel);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ============================================
   Expert Cards
   ============================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--midnight-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255,107,53,0.3);
}
.expert-avatar {
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
}
.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.expert-card:hover .expert-avatar img { transform: scale(1.05); }
.expert-info { padding: 24px; }
.expert-info h4 { font-size: 1.1rem; margin-bottom: 6px; }
.expert-role {
  color: var(--flame);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 12px;
}
.expert-desc {
  color: var(--steel);
  font-size: 0.88rem;
  margin-bottom: 16px;
  line-height: 1.6;
}
.expert-actions { display: flex; gap: 10px; justify-content: center; }

/* ============================================
   Partner Logo Wall
   ============================================ */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 40px;
  padding: 20px 0;
}
.partner-logo {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 20px 32px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--silver);
  transition: var(--transition);
  min-width: 160px;
  text-align: center;
}
.partner-logo:hover {
  border-color: rgba(255,107,53,0.3);
  color: var(--flame);
  background: rgba(255,107,53,0.08);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--midnight-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(255,107,53,0.2); }
.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1rem;
  user-select: none;
}
.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--flame);
  transition: var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}
.faq-item.active .faq-question::after {
  content: "−";
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--steel);
  font-size: 0.92rem;
  line-height: 1.7;
}
.faq-item.active .faq-answer { max-height: 500px; }

/* ============================================
   Reviews / Testimonials
   ============================================ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--midnight-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}
.review-card:hover {
  border-color: rgba(255,107,53,0.2);
  transform: translateY(-3px);
}
.review-stars {
  color: var(--warning);
  font-size: 0.9rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}
.review-text {
  color: var(--silver);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 18px;
  font-style: italic;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-flame);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}
.review-author-name { font-weight: 600; font-size: 0.92rem; }
.review-author-tag { color: var(--steel); font-size: 0.8rem; }

/* ============================================
   Contact Section
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--midnight-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
}
.contact-card:hover { border-color: rgba(255,107,53,0.2); }
.contact-icon {
  font-size: 2rem;
  margin-bottom: 16px;
  color: var(--flame);
}
.contact-card h4 { margin-bottom: 10px; font-size: 1.05rem; }
.contact-card p { color: var(--steel); font-size: 0.9rem; }

/* ============================================
   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(--midnight-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  position: relative;
  counter-increment: step;
  transition: var(--transition);
}
.howto-step:hover { border-color: rgba(255,107,53,0.3); }
.howto-step::before {
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--gradient-flame);
  border-radius: 50%;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 800;
  margin: 0 auto 18px;
}
.howto-step h4 { margin-bottom: 10px; font-size: 1.05rem; }
.howto-step p { color: var(--steel); font-size: 0.88rem; }

/* ============================================
   Share Buttons
   ============================================ */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  font-weight: 500;
  color: #fff;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #161823; border: 1px solid rgba(255,255,255,0.2); }
.share-bilibili { background: #00a1d6; }

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--carbon);
  border-top: 1px solid rgba(255,107,53,0.15);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-link { margin-bottom: 16px; }
.footer-brand p { color: var(--steel); font-size: 0.9rem; line-height: 1.7; }
.footer-col h5 {
  font-size: 1rem;
  margin-bottom: 18px;
  color: var(--glacier);
  position: relative;
  padding-bottom: 10px;
}
.footer-col h5::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--flame);
}
.footer-col a {
  display: block;
  color: var(--steel);
  font-size: 0.88rem;
  padding: 5px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--flame); padding-left: 6px; }
.footer-qr {
  display: flex;
  gap: 20px;
  margin-top: 20px;
}
.footer-qr-item { text-align: center; }
.footer-qr-item img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
}
.footer-qr-item span { font-size: 0.78rem; color: var(--steel); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.84rem;
  color: var(--steel);
}

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

/* ============================================
   Community Cards
   ============================================ */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.community-card {
  background: var(--midnight-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}
.community-card:hover {
  border-color: rgba(255,107,53,0.3);
  transform: translateY(-4px);
}
.community-card .icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}
.community-card h5 { font-size: 1rem; margin-bottom: 8px; }
.community-card p { color: var(--steel); font-size: 0.82rem; }

/* ============================================
   AI Section
   ============================================ */
.ai-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.ai-showcase-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255,107,53,0.2);
}
.ai-showcase-img img {
  width: 100%;
  height: auto;
  transition: transform 0.5s ease;
}
.ai-showcase-img:hover img { transform: scale(1.03); }
.ai-features { display: flex; flex-direction: column; gap: 20px; }
.ai-feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.06);
  transition: var(--transition);
}
.ai-feature-item:hover { border-color: rgba(255,107,53,0.2); }
.ai-feature-icon {
  width: 44px;
  height: 44px;
  background: rgba(255,107,53,0.12);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
  color: var(--flame);
}
.ai-feature-item h5 { font-size: 1rem; margin-bottom: 6px; }
.ai-feature-item p { color: var(--steel); font-size: 0.88rem; }

/* ============================================
   Page Header (Inner pages)
   ============================================ */
.page-header {
  padding: 120px 0 60px;
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
}
.page-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(to bottom, transparent, var(--midnight));
}
.page-header h1 { font-size: 2.6rem; margin-bottom: 16px; }
.page-header p { color: var(--steel); font-size: 1.05rem; }

/* ============================================
   MCP Service Frontend (Placeholder)
   ============================================ */
.mcp-widget {
  background: var(--midnight-light);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 20px;
}
.mcp-widget h5 {
  color: var(--neon-blue);
  margin-bottom: 12px;
  font-size: 0.95rem;
}
.mcp-widget .mcp-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--success);
}
.mcp-widget .mcp-status::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-showcase { grid-template-columns: 1fr; }
  .hero-content h1 { font-size: 2.4rem; }
}
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--midnight);
    flex-direction: column;
    padding: 80px 24px 24px;
    gap: 4px;
    transition: right 0.3s ease;
    border-left: 1px solid rgba(255,107,53,0.15);
    z-index: 999;
  }
  .main-nav.open { right: 0; }
  .main-nav a { padding: 12px 16px; width: 100%; }
  .hero-content h1 { font-size: 2rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat .num { font-size: 1.6rem; }
  .section { padding: 50px 0; }
  .section-header h2 { font-size: 1.8rem; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.6rem; }
  .expert-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr 1fr; }
}

/* ============================================
   Lazy Load
   ============================================ */
.lazy { opacity: 0; transition: opacity 0.5s ease; }
.lazy.loaded { opacity: 1; }

/* ============================================
   Scroll Animations
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--gradient-flame);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  border: none;
  box-shadow: var(--shadow-flame);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-4px); }