/* ============================================
   芒果视频 - 原创样式表
   游戏解说与视频社区主题
   ============================================ */

/* CSS Variables */
:root {
  --primary: #0ABAB5;
  --primary-dark: #089E9A;
  --secondary: #FF6B6B;
  --accent: #FFD700;
  --dark: #1A1A2E;
  --dark-light: #16213E;
  --text: #2D2D2D;
  --text-light: #6B7280;
  --bg: #F8FAFC;
  --bg-card: #FFFFFF;
  --border: #E5E7EB;
  --gradient-1: linear-gradient(135deg, #0ABAB5 0%, #FF6B6B 100%);
  --gradient-2: linear-gradient(135deg, #1A1A2E 0%, #16213E 50%, #0F3460 100%);
  --gradient-3: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --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, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--secondary); }
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(--dark); }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 20px; }

/* ============================================
   Header & Navigation
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}
.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-wrap img {
  height: 40px;
  width: auto;
  border-radius: 6px;
}
.logo-wrap span {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  color: rgba(255,255,255,0.8);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: #fff;
  background: rgba(10, 186, 181, 0.2);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

/* Search Bar */
.search-bar {
  background: var(--dark-light);
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.search-bar .container { display: flex; justify-content: center; }
.search-wrap {
  display: flex;
  max-width: 600px;
  width: 100%;
  background: rgba(255,255,255,0.08);
  border-radius: 50px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.1);
}
.search-wrap input {
  flex: 1;
  padding: 10px 20px;
  border: none;
  background: transparent;
  color: #fff;
  font-size: 0.95rem;
  outline: none;
}
.search-wrap input::placeholder { color: rgba(255,255,255,0.4); }
.search-wrap button {
  padding: 10px 24px;
  background: var(--gradient-1);
  border: none;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9rem;
}
.search-wrap button:hover { opacity: 0.9; }

/* ============================================
   Banner / Hero Section
   ============================================ */
.hero-banner {
  position: relative;
  min-height: 560px;
  margin-top: 70px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-banner .hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-banner .hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(10,186,181,0.4) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 60px 0;
}
.hero-content h1 {
  font-size: 2.6rem;
  color: #fff;
  margin-bottom: 16px;
  line-height: 1.2;
}
.hero-content h1 em {
  font-style: normal;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.hero-tags span {
  padding: 6px 16px;
  background: rgba(255,255,255,0.12);
  border-radius: 50px;
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem;
  backdrop-filter: blur(4px);
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--gradient-1);
  color: #fff;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(10, 186, 181, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(10, 186, 181, 0.5);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

/* ============================================
   Section Styles
   ============================================ */
.section {
  padding: 70px 0;
}
.section-dark {
  background: var(--gradient-2);
  color: #fff;
}
.section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }
.section-dark p { color: rgba(255,255,255,0.8); }
.section-alt { background: #F1F5F9; }
.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: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--gradient-1);
  border-radius: 3px;
}
.section-header p {
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 16px auto 0;
}

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.88rem;
  color: var(--text-light);
  background: #fff;
  border-bottom: 1px solid var(--border);
  margin-top: 70px;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { margin: 0 8px; color: var(--border); }

/* ============================================
   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;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}
.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 0.5s ease;
}
.video-card:hover .video-thumb img {
  transform: scale(1.08);
}
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(10, 186, 181, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  z-index: 3;
}
.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: 3px;
}
.video-card:hover .video-play-btn {
  opacity: 1;
  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: 0.78rem;
  font-weight: 600;
  z-index: 2;
}
.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;
  line-height: 1.4;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-light);
}
.video-meta .views::before { content: '▶ '; font-size: 0.7rem; }
.video-meta .likes::before { content: '♥ '; color: var(--secondary); }
.video-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(10, 186, 181, 0.1);
  color: var(--primary);
  border-radius: 50px;
  font-size: 0.75rem;
  margin-top: 8px;
}

/* ============================================
   Feature Cards / Module Grid
   ============================================ */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.module-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
  text-align: center;
}
.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.module-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--gradient-1);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}
.module-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}
.module-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* Dark module cards */
.section-dark .module-card {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
}
.section-dark .module-card:hover {
  border-color: var(--primary);
  background: rgba(255,255,255,0.1);
}
.section-dark .module-card h3 { color: #fff; }
.section-dark .module-card p { color: rgba(255,255,255,0.7); }

/* ============================================
   Expert Cards
   ============================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}
.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: 20px;
}
.expert-info h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}
.expert-role {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 10px;
}
.expert-info p {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 14px;
  line-height: 1.6;
}
.expert-links {
  display: flex;
  justify-content: center;
  gap: 10px;
}
.expert-links a {
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  transition: var(--transition);
}
.expert-links .btn-sm-primary {
  background: var(--primary);
  color: #fff;
}
.expert-links .btn-sm-primary:hover { background: var(--primary-dark); color: #fff; }
.expert-links .btn-sm-outline {
  border: 1px solid var(--primary);
  color: var(--primary);
}
.expert-links .btn-sm-outline:hover { background: var(--primary); color: #fff; }

/* ============================================
   FAQ Section
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--primary); }
.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.98rem;
  user-select: none;
}
.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--primary);
  font-weight: 300;
  transition: var(--transition);
  flex-shrink: 0;
  margin-left: 12px;
}
.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-answer-inner {
  padding: 0 24px 18px;
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ============================================
   Reviews / Testimonials
   ============================================ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover { border-color: var(--primary); }
.review-stars {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.review-text {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 10px;
}
.review-author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}
.review-author-info .name {
  font-weight: 600;
  font-size: 0.9rem;
}
.review-author-info .date {
  font-size: 0.78rem;
  color: var(--text-light);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.contact-item {
  text-align: center;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.contact-item h4 {
  margin-bottom: 8px;
  font-size: 1rem;
}
.contact-item p {
  font-size: 0.9rem;
  color: var(--text-light);
}
.qrcode-wrap {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.qrcode-item {
  text-align: center;
}
.qrcode-item img {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  border: 1px solid var(--border);
}
.qrcode-item p {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ============================================
   Community Section
   ============================================ */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.community-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}
.community-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.community-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.community-card h4 {
  padding: 14px 12px 4px;
  font-size: 0.95rem;
}
.community-card p {
  padding: 0 12px 14px;
  font-size: 0.82rem;
  color: var(--text-light);
}

/* ============================================
   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;
  box-shadow: var(--shadow);
  position: relative;
  counter-increment: step;
  border: 1px solid var(--border);
}
.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -12px;
  left: 24px;
  width: 32px;
  height: 32px;
  background: var(--gradient-1);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}
.howto-step h4 {
  margin-bottom: 8px;
  font-size: 1rem;
}
.howto-step p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ============================================
   Share Buttons
   ============================================ */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-bar span {
  font-weight: 600;
  font-size: 0.9rem;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  transition: var(--transition);
}
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); color: #fff; }
.share-btn.wechat { background: #07C160; }
.share-btn.weibo { background: #E6162D; }
.share-btn.douyin { background: #161823; }
.share-btn.bilibili { background: #00A1D6; }

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 50px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo-wrap {
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
}
.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  padding: 4px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: var(--primary); }

/* ============================================
   Inner Page Hero
   ============================================ */
.page-hero {
  background: var(--gradient-2);
  padding: 100px 0 50px;
  margin-top: 70px;
  text-align: center;
}
.page-hero h1 {
  color: #fff;
  font-size: 2.2rem;
  margin-bottom: 12px;
}
.page-hero p {
  color: rgba(255,255,255,0.7);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   About Page
   ============================================ */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.about-intro img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.stat-item {
  text-align: center;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.stat-num {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* ============================================
   Partner Logos
   ============================================ */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  align-items: center;
}
.partner-logo {
  width: 120px;
  height: 60px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  padding: 10px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.partner-logo:hover {
  border-color: var(--primary);
  transform: scale(1.05);
}

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

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

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(26, 26, 46, 0.98);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    transform: translateY(-120%);
    transition: var(--transition);
    z-index: 999;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { padding: 12px 16px; width: 100%; }
  .hero-banner { min-height: 450px; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-content p { font-size: 0.95rem; }
  .section { padding: 50px 0; }
  .section-header h2 { font-size: 1.6rem; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .about-intro { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-12 { gap: 12px; }
.gap-20 { gap: 20px; }