/* ===================================================
   里番网 - 主样式文件
   Brand: 里番网 | Domain: jqps0y.cn
   =================================================== */

/* ---- CSS Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: #0d0d0d;
  color: #e8e8e8;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #ff6b00; text-decoration: none; transition: color 0.3s; }
a:hover { color: #ffaa44; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

/* ---- CSS Variables ---- */
:root {
  --primary: #ff6b00;
  --primary-dark: #cc5500;
  --primary-light: #ff9944;
  --accent: #e8c84a;
  --bg-dark: #0d0d0d;
  --bg-card: #1a1a1a;
  --bg-card2: #222222;
  --text-main: #e8e8e8;
  --text-muted: #999;
  --text-light: #ccc;
  --border: #333;
  --radius: 10px;
  --radius-lg: 18px;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --shadow-hover: 0 8px 40px rgba(255,107,0,0.25);
  --transition: 0.3s ease;
  --max-width: 1280px;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #111; }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

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

/* ---- Header & Navigation ---- */
#header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,13,13,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,107,0,0.2);
  transition: var(--transition);
}
#header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.8); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; height: 68px; max-width: var(--max-width); margin: 0 auto;
}
.logo-wrap { display: flex; align-items: center; gap: 12px; }
.logo-img { width: 48px; height: 48px; border-radius: 8px; object-fit: cover; }
.logo-text { font-size: 1.6rem; font-weight: 900; color: var(--primary); letter-spacing: 2px; }
.logo-sub { font-size: 0.7rem; color: var(--text-muted); display: block; line-height: 1; }

.nav-main { display: flex; align-items: center; gap: 4px; }
.nav-main a {
  padding: 8px 14px; color: var(--text-light); font-size: 0.9rem;
  border-radius: 6px; transition: var(--transition); white-space: nowrap;
}
.nav-main a:hover, .nav-main a.active {
  color: var(--primary); background: rgba(255,107,0,0.1);
}

.header-actions { display: flex; align-items: center; gap: 10px; }
.btn-join {
  background: var(--primary); color: #fff; padding: 8px 20px;
  border-radius: 20px; font-size: 0.85rem; font-weight: 700;
  transition: var(--transition);
}
.btn-join:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }

/* ---- Search Bar ---- */
.search-bar-wrap {
  background: rgba(26,26,26,0.98);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
}
.search-bar-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; gap: 10px;
}
.search-input-group {
  display: flex; align-items: center; flex: 1;
  background: #111; border: 1.5px solid #333; border-radius: 24px;
  overflow: hidden; max-width: 600px;
}
.search-input-group input {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--text-main); padding: 9px 18px; font-size: 0.9rem;
}
.search-input-group input::placeholder { color: var(--text-muted); }
.search-btn {
  background: var(--primary); color: #fff; border: none;
  padding: 9px 22px; font-size: 0.9rem; cursor: pointer;
  transition: var(--transition);
}
.search-btn:hover { background: var(--primary-dark); }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tag {
  background: #222; color: var(--text-muted); padding: 4px 12px;
  border-radius: 12px; font-size: 0.78rem; cursor: pointer;
  border: 1px solid #333; transition: var(--transition);
}
.search-tag:hover { border-color: var(--primary); color: var(--primary); }

/* ---- Hero Banner ---- */
.hero-banner {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; padding-top: 110px;
}
.hero-bg {
  position: absolute; inset: 0;
  background: url('../images/banner_hero.jpg') center/cover no-repeat;
  filter: brightness(0.35);
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero-banner:hover .hero-bg { transform: scale(1); }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(13,13,13,0.7) 0%, rgba(255,107,0,0.08) 100%);
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 900px; padding: 40px 20px;
}
.hero-badge {
  display: inline-block; background: var(--primary); color: #fff;
  padding: 5px 18px; border-radius: 20px; font-size: 0.8rem;
  font-weight: 700; letter-spacing: 2px; margin-bottom: 20px;
  text-transform: uppercase;
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 5rem); font-weight: 900;
  line-height: 1.1; margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 0%, var(--primary-light) 60%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem); color: var(--text-light);
  margin-bottom: 30px; max-width: 700px; margin-left: auto; margin-right: auto;
}
.hero-stats {
  display: flex; justify-content: center; gap: 40px; margin-bottom: 36px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat-num {
  font-size: 2rem; font-weight: 900; color: var(--primary);
  display: block; line-height: 1;
}
.hero-stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: var(--primary); color: #fff; padding: 14px 36px;
  border-radius: 30px; font-size: 1rem; font-weight: 700;
  transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-outline {
  background: transparent; color: #fff; padding: 14px 36px;
  border-radius: 30px; font-size: 1rem; font-weight: 700;
  border: 2px solid rgba(255,255,255,0.4); transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ---- Section Common ---- */
section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-tag {
  display: inline-block; background: rgba(255,107,0,0.15); color: var(--primary);
  padding: 4px 16px; border-radius: 20px; font-size: 0.8rem; font-weight: 700;
  letter-spacing: 1px; margin-bottom: 12px; border: 1px solid rgba(255,107,0,0.3);
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem); font-weight: 900;
  color: var(--text-main); margin-bottom: 12px;
}
.section-title span { color: var(--primary); }
.section-desc { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* ---- Video Cards ---- */
.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-lg);
  overflow: hidden; transition: var(--transition);
  border: 1px solid var(--border);
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.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: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0.8);
  width: 56px; height: 56px; background: rgba(255,107,0,0.9);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition); z-index: 3;
}
.video-card:hover .play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.play-btn svg { width: 22px; height: 22px; fill: #fff; margin-left: 4px; }
.video-duration {
  position: absolute; bottom: 10px; right: 10px;
  background: rgba(0,0,0,0.8); color: #fff; padding: 2px 8px;
  border-radius: 4px; font-size: 0.75rem;
}
.video-category-tag {
  position: absolute; top: 10px; left: 10px;
  background: var(--primary); color: #fff; padding: 3px 10px;
  border-radius: 4px; font-size: 0.72rem; font-weight: 700;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem; font-weight: 700; color: var(--text-main);
  margin-bottom: 8px; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-meta { display: flex; align-items: center; gap: 12px; font-size: 0.78rem; color: var(--text-muted); }
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-author { display: flex; align-items: center; gap: 8px; margin-top: 10px; }
.author-avatar {
  width: 28px; height: 28px; border-radius: 50%; object-fit: cover;
  background: var(--primary); display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; color: #fff; font-weight: 700; flex-shrink: 0;
}
.author-name { font-size: 0.8rem; color: var(--text-muted); }

/* ---- Feature Modules ---- */
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 28px;
}
.feature-card {
  background: var(--bg-card); border-radius: var(--radius-lg); padding: 32px 28px;
  border: 1px solid var(--border); transition: var(--transition);
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transition: var(--transition); transform-origin: left;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(255,107,0,0.3); }
.feature-icon {
  width: 56px; height: 56px; background: rgba(255,107,0,0.15);
  border-radius: 14px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 1.6rem;
}
.feature-title { font-size: 1.1rem; font-weight: 800; color: var(--text-main); margin-bottom: 10px; }
.feature-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }
.feature-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 14px; }
.feature-tag {
  background: rgba(255,107,0,0.1); color: var(--primary);
  padding: 3px 10px; border-radius: 10px; font-size: 0.72rem;
  border: 1px solid rgba(255,107,0,0.2);
}

/* ---- Expert Cards ---- */
.experts-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 28px;
}
.expert-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  overflow: hidden; border: 1px solid var(--border); transition: var(--transition);
}
.expert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.expert-img-wrap { position: relative; padding-top: 75%; overflow: hidden; }
.expert-img-wrap img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s;
}
.expert-card:hover .expert-img-wrap img { transform: scale(1.05); }
.expert-badge {
  position: absolute; bottom: 12px; left: 12px;
  background: var(--primary); color: #fff; padding: 4px 12px;
  border-radius: 6px; font-size: 0.75rem; font-weight: 700;
}
.expert-info { padding: 20px; }
.expert-name { font-size: 1.1rem; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--primary); margin-bottom: 10px; }
.expert-desc { font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-awards { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.expert-award {
  background: rgba(232,200,74,0.1); color: var(--accent);
  padding: 3px 10px; border-radius: 8px; font-size: 0.72rem;
  border: 1px solid rgba(232,200,74,0.2);
}
.expert-btns { display: flex; gap: 8px; }
.btn-sm {
  padding: 7px 16px; border-radius: 8px; font-size: 0.8rem; font-weight: 700;
  transition: var(--transition);
}
.btn-sm-primary { background: var(--primary); color: #fff; }
.btn-sm-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-sm-outline { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-sm-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ---- Partners ---- */
.partners-section { background: var(--bg-card); }
.partners-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 20px;
}
.partner-item {
  background: var(--bg-card2); border-radius: var(--radius);
  padding: 20px; text-align: center; border: 1px solid var(--border);
  transition: var(--transition);
}
.partner-item:hover { border-color: var(--primary); transform: translateY(-3px); }
.partner-logo {
  font-size: 1.5rem; font-weight: 900; color: var(--text-muted);
  display: block; margin-bottom: 6px; transition: var(--transition);
}
.partner-item:hover .partner-logo { color: var(--primary); }
.partner-name { font-size: 0.75rem; color: var(--text-muted); }

/* ---- FAQ ---- */
.faq-section { background: var(--bg-card); }
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border); overflow: hidden;
}
.faq-question {
  width: 100%; background: transparent; color: var(--text-main);
  padding: 20px 0; font-size: 1rem; font-weight: 700;
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; text-align: left; transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 28px; height: 28px; background: rgba(255,107,0,0.1);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: var(--transition); color: var(--primary); font-size: 1.2rem;
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s;
  color: var(--text-muted); font-size: 0.9rem; line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding-bottom: 18px; }

/* ---- Reviews ---- */
.reviews-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px;
}
.review-card {
  background: var(--bg-card); border-radius: var(--radius-lg); padding: 28px;
  border: 1px solid var(--border); transition: var(--transition);
  position: relative;
}
.review-card:hover { border-color: rgba(255,107,0,0.3); transform: translateY(-3px); }
.review-quote {
  font-size: 3rem; color: var(--primary); line-height: 1;
  position: absolute; top: 16px; right: 20px; opacity: 0.3;
}
.review-stars { color: var(--accent); font-size: 1rem; margin-bottom: 14px; letter-spacing: 2px; }
.review-text { font-size: 0.9rem; color: var(--text-light); line-height: 1.8; margin-bottom: 18px; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px; height: 44px; border-radius: 50%; background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: #fff; font-weight: 700; flex-shrink: 0;
}
.review-name { font-size: 0.9rem; font-weight: 700; color: var(--text-main); }
.review-info { font-size: 0.75rem; color: var(--text-muted); }

/* ---- Contact Section ---- */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.contact-card {
  background: var(--bg-card); border-radius: var(--radius-lg); padding: 36px;
  border: 1px solid var(--border);
}
.contact-title { font-size: 1.3rem; font-weight: 800; margin-bottom: 20px; color: var(--text-main); }
.contact-item { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 18px; }
.contact-icon {
  width: 40px; height: 40px; background: rgba(255,107,0,0.1);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; flex-shrink: 0;
}
.contact-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.92rem; color: var(--text-main); font-weight: 600; }

/* ---- QR Codes ---- */
.qr-grid { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-box {
  width: 120px; height: 120px; background: #fff;
  border-radius: 12px; margin: 0 auto 8px; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.qr-box svg { width: 100px; height: 100px; }
.qr-label { font-size: 0.78rem; color: var(--text-muted); }

/* ---- Share Buttons ---- */
.share-section { background: var(--bg-card); }
.share-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 24px; font-size: 0.88rem; font-weight: 700;
  transition: var(--transition); cursor: pointer;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.4); color: #fff; }

/* ---- Footer ---- */
#footer {
  background: #080808; border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 50px;
}
.footer-brand .logo-text { font-size: 1.8rem; margin-bottom: 12px; }
.footer-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px; height: 36px; border-radius: 8px; background: #1a1a1a;
  border: 1px solid var(--border); display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; color: var(--text-muted); transition: var(--transition);
}
.social-btn:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.footer-col h4 { font-size: 1rem; font-weight: 800; color: var(--text-main); margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.85rem; color: var(--text-muted); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border); padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px;
}
.footer-copy { font-size: 0.8rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 0.8rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--primary); }

/* ---- Breadcrumb ---- */
.breadcrumb {
  padding: 14px 0; font-size: 0.82rem; color: var(--text-muted);
  display: flex; align-items: center; gap: 6px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: #444; }
.breadcrumb .current { color: var(--primary); }

/* ---- Page Hero (inner pages) ---- */
.page-hero {
  padding: 140px 0 60px;
  background: linear-gradient(135deg, #111 0%, #1a0a00 100%);
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(255,107,0,0.08) 0%, transparent 70%);
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 900; margin-bottom: 12px; }
.page-hero p { font-size: 1rem; color: var(--text-muted); max-width: 600px; }

/* ---- Stats Bar ---- */
.stats-bar { background: var(--primary); padding: 20px 0; }
.stats-inner {
  display: flex; justify-content: space-around; align-items: center;
  flex-wrap: wrap; gap: 20px;
}
.stat-item { text-align: center; }
.stat-num { font-size: 1.8rem; font-weight: 900; color: #fff; display: block; }
.stat-label { font-size: 0.78rem; color: rgba(255,255,255,0.8); }

/* ---- Tabs ---- */
.tabs-nav {
  display: flex; gap: 4px; background: var(--bg-card);
  border-radius: 12px; padding: 4px; margin-bottom: 32px;
  border: 1px solid var(--border); flex-wrap: wrap;
}
.tab-btn {
  flex: 1; min-width: 100px; padding: 10px 20px; border-radius: 9px;
  background: transparent; color: var(--text-muted); font-size: 0.9rem; font-weight: 600;
  transition: var(--transition); cursor: pointer; text-align: center;
}
.tab-btn.active, .tab-btn:hover { background: var(--primary); color: #fff; }

/* ---- Mobile Menu ---- */
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  padding: 8px;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--text-main); border-radius: 2px; transition: var(--transition);
}
.mobile-nav {
  display: none; position: fixed; top: 68px; left: 0; right: 0;
  background: rgba(13,13,13,0.98); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); z-index: 999; padding: 20px;
}
.mobile-nav.open { display: block; }
.mobile-nav a {
  display: block; padding: 12px 16px; color: var(--text-light);
  border-bottom: 1px solid rgba(255,255,255,0.05); font-size: 0.95rem;
}
.mobile-nav a:hover { color: var(--primary); background: rgba(255,107,0,0.05); }

/* ---- Animations ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.fade-in { animation: fadeInUp 0.6s ease forwards; }
.pulse { animation: pulse 2s ease infinite; }

/* ---- Utility ---- */
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; } .mb-16 { margin-bottom: 16px; } .mb-24 { margin-bottom: 24px; }
.hidden { display: none; }
.bg-dark { background: var(--bg-dark); }
.bg-card { background: var(--bg-card); }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-main { display: none; }
  .hamburger { display: flex; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .search-tags { display: none; }
  section { padding: 50px 0; }
  .header-actions .btn-join { display: none; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: center; }
  .video-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: 1fr; }
}