/* =============================================
   糖心vlog - 主样式文件
   品牌色：深红 #c0392b | 橙金 #e67e22 | 暗底 #0d0d1a
   ============================================= */

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
  background: #0d0d1a;
  color: #e8e8f0;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #e67e22; text-decoration: none; transition: color .25s; }
a:hover { color: #ff6b35; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---- CSS Variables ---- */
:root {
  --red:    #c0392b;
  --orange: #e67e22;
  --gold:   #f39c12;
  --dark:   #0d0d1a;
  --dark2:  #12122a;
  --dark3:  #1a1a3a;
  --card:   #16162e;
  --border: #2a2a4a;
  --text:   #e8e8f0;
  --muted:  #8888aa;
  --grad:   linear-gradient(135deg, #c0392b 0%, #e67e22 100%);
  --grad2:  linear-gradient(135deg, #1a1a3a 0%, #0d0d1a 100%);
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0,0,0,.5);
}

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

/* ============ HEADER ============ */
#site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,13,26,.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s;
}
#site-header.scrolled { box-shadow: 0 4px 20px rgba(192,57,43,.3); }

.header-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 24px;
  padding: 0 20px; height: 68px;
}

/* Logo */
.site-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.site-logo img.logo-img { width: 40px; height: 40px; border-radius: 8px; }
.site-logo .brand-name {
  font-size: 1.25rem; font-weight: 700;
  background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

/* Nav */
.main-nav { flex: 1; }
.main-nav ul { display: flex; gap: 4px; align-items: center; }
.main-nav ul li a {
  display: block; padding: 6px 14px; border-radius: 6px;
  color: var(--text); font-size: .9rem; font-weight: 500;
  transition: background .2s, color .2s;
}
.main-nav ul li a:hover,
.main-nav ul li a.active {
  background: rgba(192,57,43,.2); color: var(--orange);
}

/* Search */
.header-search { display: flex; align-items: center; gap: 8px; }
.header-search input {
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: 20px; padding: 7px 16px; color: var(--text);
  font-size: .85rem; width: 200px; outline: none;
  transition: border-color .2s, width .3s;
}
.header-search input:focus { border-color: var(--orange); width: 240px; }
.header-search input::placeholder { color: var(--muted); }
.header-search button {
  background: var(--grad); border: none; border-radius: 20px;
  padding: 7px 16px; color: #fff; font-size: .85rem; cursor: pointer;
  transition: opacity .2s;
}
.header-search button:hover { opacity: .85; }

/* Mobile toggle */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--text);
  margin: 5px 0; transition: .3s;
}

/* ============ BREADCRUMB ============ */
.breadcrumb {
  background: var(--dark2); border-bottom: 1px solid var(--border);
  padding: 10px 0; margin-top: 68px;
}
.breadcrumb .container { display: flex; align-items: center; gap: 8px; font-size: .85rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--orange); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--orange); }

/* ============ CONTAINER ============ */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }

/* ============ SECTION TITLES ============ */
.section-title {
  text-align: center; margin-bottom: 48px;
}
.section-title h2 {
  font-size: 2rem; font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}
.section-title p { color: var(--muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }
.section-title .title-line {
  width: 60px; height: 3px; background: var(--grad);
  margin: 16px auto 0; border-radius: 2px;
}

/* ============ BANNER / HERO ============ */
#hero-banner {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; margin-top: 68px;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover; background-position: center;
  filter: brightness(.45);
  transform: scale(1.05);
  transition: transform 8s ease;
}
#hero-banner:hover .hero-bg { transform: scale(1.0); }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(13,13,26,.3) 0%, rgba(13,13,26,.7) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  text-align: center; padding: 40px 20px;
  max-width: 900px;
}
.hero-badge {
  display: inline-block; background: rgba(192,57,43,.8);
  color: #fff; font-size: .8rem; font-weight: 600;
  padding: 4px 14px; border-radius: 20px; margin-bottom: 20px;
  letter-spacing: 1px; text-transform: uppercase;
}
.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 4rem); font-weight: 900;
  color: #fff; line-height: 1.2; margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,.5);
}
.hero-content h1 span { background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-content p {
  font-size: 1.15rem; color: rgba(255,255,255,.85);
  margin-bottom: 36px; max-width: 680px; margin-left: auto; margin-right: auto;
}
.hero-stats {
  display: flex; justify-content: center; gap: 40px;
  margin-bottom: 40px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 2rem; font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-stat .label { font-size: .8rem; color: rgba(255,255,255,.7); margin-top: 4px; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: var(--grad); color: #fff; font-weight: 700;
  padding: 14px 32px; border-radius: 30px; border: none;
  font-size: 1rem; cursor: pointer; transition: transform .2s, box-shadow .2s;
  box-shadow: 0 4px 20px rgba(192,57,43,.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(192,57,43,.5); color: #fff; }
.btn-outline {
  background: transparent; color: #fff; font-weight: 600;
  padding: 13px 30px; border-radius: 30px;
  border: 2px solid rgba(255,255,255,.5); font-size: 1rem;
  cursor: pointer; transition: border-color .2s, background .2s;
}
.btn-outline:hover { border-color: var(--orange); background: rgba(230,126,34,.1); color: #fff; }
.hero-scroll {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  z-index: 2; animation: bounce 2s infinite;
}
.hero-scroll span {
  display: block; width: 24px; height: 24px;
  border-right: 2px solid rgba(255,255,255,.6); border-bottom: 2px solid rgba(255,255,255,.6);
  transform: rotate(45deg); margin: -8px auto 0;
}
@keyframes bounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(8px)} }

/* ============ VIDEO CARDS ============ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s, box-shadow .25s;
  cursor: pointer; border: 1px solid var(--border);
}
.video-card:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(0,0,0,.5); }
.video-thumb {
  position: relative; overflow: hidden; padding-top: 56.25%;
}
.video-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.play-btn {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.0); transition: background .25s;
}
.video-card:hover .play-btn { background: rgba(0,0,0,.4); }
.play-icon {
  width: 56px; height: 56px; background: rgba(192,57,43,.9);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: scale(.8); transition: opacity .25s, transform .25s;
}
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }
.play-icon::after {
  content: ''; border-left: 20px solid #fff; border-top: 12px solid transparent;
  border-bottom: 12px solid transparent; margin-left: 4px;
}
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,.8); color: #fff; font-size: .75rem;
  padding: 2px 6px; border-radius: 4px;
}
.video-tag {
  position: absolute; top: 8px; left: 8px;
  background: var(--red); color: #fff; font-size: .7rem;
  padding: 2px 8px; border-radius: 4px; font-weight: 600;
}
.video-info { padding: 16px; }
.video-info h3 { font-size: .95rem; font-weight: 600; color: var(--text); margin-bottom: 8px; line-height: 1.4; }
.video-meta { display: flex; gap: 12px; font-size: .8rem; color: var(--muted); flex-wrap: wrap; }
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ============ FEATURE CARDS ============ */
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px;
}
.feature-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 24px; text-align: center;
  transition: transform .25s, border-color .25s;
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--orange); }
.feature-icon {
  width: 64px; height: 64px; background: rgba(192,57,43,.15);
  border-radius: 16px; display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px; font-size: 2rem;
}
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.feature-card p { font-size: .9rem; color: var(--muted); line-height: 1.6; }

/* ============ EXPERT CARDS ============ */
.expert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 28px; }
.expert-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: transform .25s, box-shadow .25s;
}
.expert-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.expert-avatar { position: relative; height: 240px; overflow: hidden; }
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform .4s; }
.expert-card:hover .expert-avatar img { transform: scale(1.05); }
.expert-badge {
  position: absolute; top: 12px; right: 12px;
  background: var(--grad); color: #fff; font-size: .72rem;
  padding: 3px 10px; border-radius: 20px; font-weight: 600;
}
.expert-body { padding: 20px; }
.expert-body h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: .82rem; color: var(--orange); margin-bottom: 10px; }
.expert-desc { font-size: .85rem; color: var(--muted); margin-bottom: 14px; line-height: 1.6; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.award-tag {
  background: rgba(192,57,43,.15); color: var(--orange);
  font-size: .72rem; padding: 3px 8px; border-radius: 4px; border: 1px solid rgba(192,57,43,.3);
}
.expert-btns { display: flex; gap: 10px; }
.btn-sm {
  flex: 1; text-align: center; padding: 8px 12px; border-radius: 8px;
  font-size: .82rem; font-weight: 600; transition: .2s;
}
.btn-sm.primary { background: var(--grad); color: #fff; }
.btn-sm.outline { border: 1px solid var(--border); color: var(--text); }
.btn-sm:hover { opacity: .85; }

/* ============ REVIEW CARDS ============ */
.review-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.review-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.review-header { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.review-avatar {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--grad); display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; font-weight: 700; color: #fff; flex-shrink: 0;
}
.review-name { font-weight: 600; font-size: .95rem; }
.review-stars { color: var(--gold); font-size: .85rem; margin-top: 2px; }
.review-text { font-size: .9rem; color: var(--muted); line-height: 1.7; margin-bottom: 12px; }
.review-game { font-size: .78rem; color: var(--orange); }
.review-date { font-size: .75rem; color: var(--border); margin-top: 6px; }

/* ============ FAQ ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 12px; overflow: hidden;
}
.faq-question {
  padding: 18px 24px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font-weight: 600; font-size: .95rem;
  transition: background .2s;
}
.faq-question:hover { background: rgba(192,57,43,.08); }
.faq-icon {
  width: 24px; height: 24px; border-radius: 50%;
  background: rgba(192,57,43,.2); display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: var(--orange); flex-shrink: 0;
  transition: transform .3s;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .35s;
  padding: 0 24px; color: var(--muted); font-size: .9rem; line-height: 1.7;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ============ STATS BAR ============ */
.stats-bar {
  background: var(--dark2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding: 40px 0;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat-item .num {
  font-size: 2.2rem; font-weight: 900;
  background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-item .label { font-size: .85rem; color: var(--muted); margin-top: 4px; }

/* ============ PARTNER LOGOS ============ */
.partner-logos {
  display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; align-items: center;
}
.partner-logo {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 28px;
  font-size: .9rem; font-weight: 700; color: var(--muted);
  transition: border-color .2s, color .2s;
}
.partner-logo:hover { border-color: var(--orange); color: var(--orange); }

/* ============ COMMUNITY TABS ============ */
.tab-nav { display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; }
.tab-btn {
  padding: 10px 22px; border-radius: 30px; border: 1px solid var(--border);
  background: var(--card); color: var(--muted); font-size: .9rem; cursor: pointer;
  transition: .2s;
}
.tab-btn.active, .tab-btn:hover { background: var(--grad); color: #fff; border-color: transparent; }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ============ CONTACT ============ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 20px; }
.contact-item { display: flex; gap: 14px; margin-bottom: 18px; align-items: flex-start; }
.contact-icon {
  width: 44px; height: 44px; background: rgba(192,57,43,.15);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.contact-detail .label { font-size: .8rem; color: var(--muted); }
.contact-detail .value { font-size: .95rem; font-weight: 600; }
.qr-row { display: flex; gap: 24px; margin-top: 24px; flex-wrap: wrap; }
.qr-box { text-align: center; }
.qr-box img { width: 120px; height: 120px; border-radius: 8px; border: 2px solid var(--border); }
.qr-box p { font-size: .8rem; color: var(--muted); margin-top: 8px; }

/* ============ SHARE BAR ============ */
.share-bar {
  background: var(--dark2); border-top: 1px solid var(--border);
  padding: 20px 0;
}
.share-inner { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.share-label { font-size: .9rem; color: var(--muted); }
.share-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.share-btn {
  padding: 8px 18px; border-radius: 20px; font-size: .82rem; font-weight: 600;
  cursor: pointer; border: none; transition: opacity .2s;
}
.share-btn:hover { opacity: .85; }
.share-btn.wechat  { background: #07c160; color: #fff; }
.share-btn.weibo   { background: #e6162d; color: #fff; }
.share-btn.douyin  { background: #010101; color: #fff; border: 1px solid #333; }
.share-btn.bilibili{ background: #00a1d6; color: #fff; }
.share-btn.qq      { background: #12b7f5; color: #fff; }

/* ============ FOOTER ============ */
#site-footer {
  background: #080814; border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 40px; border-bottom: 1px solid var(--border);
}
.footer-brand .brand-name {
  font-size: 1.3rem; font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}
.footer-brand p { font-size: .88rem; color: var(--muted); line-height: 1.7; margin-bottom: 20px; }
.footer-logo-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-logo-wrap img { width: 36px; height: 36px; border-radius: 8px; }
.footer-col h4 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; color: var(--text); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: .88rem; color: var(--muted); transition: color .2s; }
.footer-col ul li a:hover { color: var(--orange); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 0; font-size: .82rem; color: var(--muted); flex-wrap: wrap; gap: 10px;
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--muted); font-size: .82rem; }
.footer-links a:hover { color: var(--orange); }

/* ============ TAGS ============ */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: rgba(192,57,43,.12); color: var(--orange);
  border: 1px solid rgba(192,57,43,.25); border-radius: 20px;
  padding: 4px 12px; font-size: .8rem; transition: .2s;
}
.tag:hover { background: rgba(192,57,43,.25); }

/* ============ SECTION BG VARIANTS ============ */
.bg-dark2 { background: var(--dark2); }
.bg-dark3 { background: var(--dark3); }
.bg-gradient { background: linear-gradient(135deg, #12122a 0%, #1a0a0a 100%); }

/* ============ AI SECTION ============ */
.ai-features { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.ai-img { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.ai-img img { width: 100%; }
.ai-list { list-style: none; }
.ai-list li {
  display: flex; gap: 14px; margin-bottom: 20px; align-items: flex-start;
}
.ai-list .ai-num {
  width: 36px; height: 36px; background: var(--grad);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: .85rem; font-weight: 700; color: #fff; flex-shrink: 0;
}
.ai-list .ai-text h4 { font-size: .95rem; font-weight: 700; margin-bottom: 4px; }
.ai-list .ai-text p { font-size: .85rem; color: var(--muted); }

/* ============ NOTICE BAR ============ */
.notice-bar {
  background: rgba(192,57,43,.12); border: 1px solid rgba(192,57,43,.3);
  border-radius: 8px; padding: 12px 20px;
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 32px; font-size: .88rem;
}
.notice-bar .notice-icon { font-size: 1.1rem; flex-shrink: 0; }
.notice-bar .notice-text { color: var(--text); }
.notice-bar .notice-text strong { color: var(--orange); }

/* ============ PAGE HERO (inner pages) ============ */
.page-hero {
  background: var(--dark2); border-bottom: 1px solid var(--border);
  padding: 60px 0 40px; margin-top: 68px; text-align: center;
}
.page-hero h1 {
  font-size: 2.2rem; font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
}
.page-hero p { color: var(--muted); font-size: 1rem; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-features { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; position: fixed; top: 68px; left: 0; right: 0;
    background: rgba(13,13,26,.98); padding: 20px; z-index: 999; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; }
  .main-nav ul li a { padding: 12px 16px; font-size: 1rem; }
  .nav-toggle { display: block; }
  .header-search { display: none; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 50px 0; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}
@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.5rem; }
  .hero-btns { flex-direction: column; align-items: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
}

/* ============ ANIMATIONS ============ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp .6s ease forwards; }
.fade-in-delay-1 { animation-delay: .1s; opacity: 0; animation: fadeInUp .6s .1s ease forwards; }
.fade-in-delay-2 { animation-delay: .2s; opacity: 0; animation: fadeInUp .6s .2s ease forwards; }
.fade-in-delay-3 { animation-delay: .3s; opacity: 0; animation: fadeInUp .6s .3s ease forwards; }

/* ============ UTILITY ============ */
.text-center { text-align: center; }
.text-muted { color: var(--muted); }
.text-orange { color: var(--orange); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.mb-24 { margin-bottom: 24px; }
.mb-40 { margin-bottom: 40px; }
.hidden { display: none; }

/* ============ FOOTER CERT BADGES ============ */
.footer-certs {
  display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0;
}
.cert-badge {
  background: rgba(230,126,34,.12); color: var(--orange);
  border: 1px solid rgba(230,126,34,.3); border-radius: 6px;
  font-size: .75rem; padding: 4px 10px; font-weight: 600;
}

/* ============ VIDEO PLAY OVERLAY ENHANCED ============ */
.video-card { position: relative; }
.video-card .video-thumb video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; display: none;
}
.video-card:hover .video-thumb video { display: block; }
.video-card:hover .video-thumb img  { opacity: 0; }

/* ============ ARTICLE CONTENT (内页深度内容) ============ */
.article-body { max-width: 860px; margin: 0 auto; }
.article-body h2 { font-size: 1.5rem; font-weight: 800; margin: 36px 0 16px;
  background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.article-body h3 { font-size: 1.2rem; font-weight: 700; margin: 28px 0 12px; color: var(--text); }
.article-body h4 { font-size: 1rem; font-weight: 700; margin: 20px 0 8px; color: var(--orange); }
.article-body h5 { font-size: .95rem; font-weight: 600; margin: 16px 0 6px; color: var(--muted); }
.article-body h6 { font-size: .9rem; font-weight: 600; margin: 12px 0 4px; color: var(--muted); }
.article-body p  { color: var(--muted); line-height: 1.85; margin-bottom: 16px; font-size: .95rem; }
.article-body ul, .article-body ol { color: var(--muted); padding-left: 20px; margin-bottom: 16px; }
.article-body li { margin-bottom: 8px; line-height: 1.7; font-size: .93rem; }
.article-body strong { color: var(--text); }
.article-body blockquote {
  border-left: 3px solid var(--red); padding: 12px 20px;
  background: rgba(192,57,43,.06); border-radius: 0 8px 8px 0;
  margin: 20px 0; color: var(--text); font-style: italic;
}
.article-body .highlight-box {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px; margin: 24px 0;
}
.article-body .highlight-box h4 { margin-top: 0; }

/* ============ EEAT AUTHOR BOX ============ */
.eeat-author {
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin: 40px 0;
}
.eeat-author-avatar {
  width: 72px; height: 72px; border-radius: 50%;
  background: var(--grad); display: flex; align-items: center;
  justify-content: center; font-size: 1.8rem; font-weight: 700;
  color: #fff; flex-shrink: 0;
}
.eeat-author-info h4 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.eeat-author-info .role { font-size: .82rem; color: var(--orange); margin-bottom: 8px; }
.eeat-author-info p { font-size: .85rem; color: var(--muted); line-height: 1.6; margin: 0; }

/* ============ LAST UPDATED BAR ============ */
.last-updated {
  display: flex; align-items: center; gap: 8px;
  font-size: .82rem; color: var(--muted);
  border-top: 1px solid var(--border); padding-top: 12px; margin-top: 32px;
}
.last-updated strong { color: var(--orange); }

/* ============ REVEAL ANIMATION ============ */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .5s ease, transform .5s ease; }
.reveal.fade-in { opacity: 1; transform: translateY(0); }

/* ============ STAT-NUMBER / STAT-LABEL（内页计数器） ============ */
.stat-item .stat-number {
  font-size: 2.2rem;
  font-weight: 900;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}
.stat-item .stat-label {
  font-size: .85rem;
  color: var(--muted);
  margin-top: 6px;
}

/* ============ FEATURE-TAG 标签 ============ */
.feature-tag {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 10px;
  background: rgba(192,57,43,.15);
  color: var(--red);
  border-radius: 20px;
  font-size: .78rem;
  font-weight: 600;
}