/* ============================================
   糖心vlog 全站样式表
   赛博朋克风格 · 影视传媒主题
   iygtno.cn
   ============================================ */

/* CSS Variables */
:root {
  --primary: #FF2D78;
  --primary-light: #FF6B9D;
  --secondary: #7B2FFF;
  --accent: #00D4FF;
  --gold: #FFD700;
  --bg-dark: #0A0A1A;
  --bg-card: #12122A;
  --bg-card-hover: #1A1A3A;
  --text-white: #FFFFFF;
  --text-light: #E0E0E0;
  --text-muted: #A0A0B0;
  --border-glow: rgba(255,45,120,0.3);
  --shadow-neon: 0 0 20px rgba(255,45,120,0.2);
  --shadow-purple: 0 0 20px rgba(123,47,255,0.2);
  --gradient-primary: linear-gradient(135deg, #FF2D78, #7B2FFF);
  --gradient-accent: linear-gradient(135deg, #7B2FFF, #00D4FF);
  --gradient-warm: linear-gradient(135deg, #FF2D78, #FF6B9D);
  --max-width: 1280px;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ============ Header / Navigation ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,10,26,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,45,120,0.15);
  transition: var(--transition);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max-width); margin: 0 auto; padding: 0 20px; height: 68px;
}
.logo-link { display: flex; align-items: center; gap: 10px; }
.logo-img { height: 42px; width: auto; }
.logo-text {
  font-size: 1.4rem; font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  color: var(--text-light); padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 500; transition: var(--transition);
  position: relative;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary); background: rgba(255,45,120,0.08);
}
.main-nav a.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 20px; height: 2px; background: var(--primary); border-radius: 1px;
}
.mobile-toggle { display: none; background: none; border: none; color: var(--text-white); font-size: 1.5rem; cursor: pointer; }

/* Search Bar under nav */
.search-bar-wrap {
  background: rgba(18,18,42,0.85);
  border-bottom: 1px solid rgba(123,47,255,0.12);
  padding: 10px 0;
  margin-top: 68px;
}
.search-bar {
  max-width: 640px; margin: 0 auto; position: relative;
  display: flex; align-items: center;
}
.search-bar input {
  width: 100%; padding: 10px 48px 10px 18px;
  background: var(--bg-card); border: 1px solid rgba(255,45,120,0.2);
  border-radius: 24px; color: var(--text-white); font-size: 0.95rem;
  outline: none; transition: var(--transition);
}
.search-bar input:focus { border-color: var(--primary); box-shadow: var(--shadow-neon); }
.search-bar input::placeholder { color: var(--text-muted); }
.search-bar button {
  position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  background: var(--gradient-primary); border: none; color: #fff;
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; transition: var(--transition);
}
.search-bar button:hover { opacity: 0.85; }

/* ============ Hero Section ============ */
.hero {
  position: relative; min-height: 520px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, rgba(10,10,26,0.7), rgba(10,10,26,0.95)),
              url('../images/banners/hero-banner.png') center/cover no-repeat;
  text-align: center; padding: 80px 20px 60px;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(255,45,120,0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(123,47,255,0.1) 0%, transparent 60%);
}
.hero-content { position: relative; z-index: 2; max-width: 800px; }
.hero h1 {
  font-size: 2.8rem; font-weight: 800; margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1.3;
}
.hero h1 span { display: block; font-size: 1.1rem; font-weight: 400; color: var(--text-muted); -webkit-text-fill-color: var(--text-muted); margin-top: 8px; }
.hero p { font-size: 1.1rem; color: var(--text-light); margin-bottom: 28px; max-width: 600px; margin-left: auto; margin-right: auto; }
.hero-stats { display: flex; justify-content: center; gap: 40px; margin-top: 32px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2rem; font-weight: 700; color: var(--primary); }
.hero-stat .label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 24px; font-size: 0.95rem; font-weight: 600;
  transition: var(--transition); cursor: pointer; border: none;
}
.btn-primary { background: var(--gradient-primary); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,45,120,0.35); color: #fff; }
.btn-outline {
  background: transparent; color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: rgba(255,45,120,0.1); color: var(--primary); }
.btn-accent { background: var(--gradient-accent); color: #fff; }
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,212,255,0.3); color: #fff; }
.btn-group { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ============ Section Common ============ */
.section { padding: 70px 0; }
.section-alt { background: var(--bg-card); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: 2rem; font-weight: 700; margin-bottom: 12px;
  color: var(--text-white);
}
.section-header h2 .highlight { color: var(--primary); }
.section-header p { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }
.section-tag {
  display: inline-block; padding: 4px 14px; border-radius: 12px;
  background: rgba(255,45,120,0.1); color: var(--primary);
  font-size: 0.8rem; font-weight: 600; margin-bottom: 12px;
  letter-spacing: 1px; text-transform: uppercase;
}

/* ============ Video Cards ============ */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card); border-radius: var(--radius);
  overflow: hidden; transition: var(--transition);
  border: 1px solid rgba(255,45,120,0.08);
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-neon);
  border-color: rgba(255,45,120,0.25);
}
.video-thumb {
  position: relative; aspect-ratio: 16/9; overflow: hidden;
  background: #111;
}
.video-thumb img,
.video-thumb video {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img,
.video-card:hover .video-thumb video { transform: scale(1.05); }
.video-play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%) scale(0.8);
  width: 60px; height: 60px; border-radius: 50%;
  background: rgba(255,45,120,0.85); display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition);
  box-shadow: 0 0 30px rgba(255,45,120,0.5);
}
.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(0,0,0,0.8); color: #fff; padding: 2px 8px;
  border-radius: 4px; font-size: 0.75rem; font-weight: 600;
}
.video-info { padding: 16px; }
.video-info h3 {
  font-size: 1rem; font-weight: 600; color: var(--text-white);
  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: 14px;
  font-size: 0.8rem; color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.video-tags .tag {
  padding: 2px 10px; border-radius: 10px; font-size: 0.72rem;
  background: rgba(123,47,255,0.12); color: var(--secondary);
}

/* ============ Service Grid ============ */
.service-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.service-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 32px 24px; text-align: center;
  border: 1px solid rgba(123,47,255,0.1);
  transition: var(--transition);
}
.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(123,47,255,0.3);
  box-shadow: var(--shadow-purple);
}
.service-icon {
  width: 64px; height: 64px; border-radius: 16px;
  background: var(--gradient-accent); display: flex;
  align-items: center; justify-content: center;
  margin: 0 auto 18px; font-size: 1.8rem;
}
.service-card h3 { font-size: 1.1rem; font-weight: 600; color: var(--text-white); margin-bottom: 10px; }
.service-card p { font-size: 0.88rem; color: var(--text-muted); 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(--bg-card); border-radius: var(--radius);
  padding: 28px; text-align: center;
  border: 1px solid rgba(255,45,120,0.08);
  transition: var(--transition);
}
.expert-card:hover { border-color: rgba(255,45,120,0.2); box-shadow: var(--shadow-neon); }
.expert-avatar {
  width: 100px; height: 100px; border-radius: 50%;
  object-fit: cover; margin: 0 auto 16px;
  border: 3px solid rgba(255,45,120,0.3);
}
.expert-card h3 { font-size: 1.1rem; font-weight: 600; color: var(--text-white); margin-bottom: 4px; }
.expert-card .role { color: var(--primary); font-size: 0.85rem; margin-bottom: 10px; }
.expert-card .bio { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 14px; line-height: 1.5; }
.expert-card .awards { font-size: 0.78rem; color: var(--gold); margin-bottom: 14px; }
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.expert-btns a {
  padding: 6px 16px; border-radius: 16px; font-size: 0.8rem; font-weight: 500;
}

/* ============ Partners ============ */
.partner-wall {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 30px; align-items: center;
}
.partner-item {
  background: var(--bg-card); border-radius: var(--radius-sm);
  padding: 18px 28px; border: 1px solid rgba(255,255,255,0.06);
  font-size: 1rem; font-weight: 600; color: var(--text-muted);
  transition: var(--transition);
}
.partner-item:hover { border-color: var(--primary); color: var(--primary); }

/* ============ Reviews ============ */
.review-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 24px; border: 1px solid rgba(255,45,120,0.06);
}
.review-stars { color: var(--gold); font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; margin-bottom: 14px; 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-primary); display: flex;
  align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 0.9rem;
}
.review-author-info .name { font-size: 0.88rem; font-weight: 600; color: var(--text-white); }
.review-author-info .date { font-size: 0.75rem; color: var(--text-muted); }

/* ============ FAQ ============ */
.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 rgba(123,47,255,0.1);
  overflow: hidden;
}
.faq-question {
  padding: 18px 24px; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center;
  font-weight: 600; color: var(--text-white); font-size: 0.95rem;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-question .arrow { transition: transform 0.3s ease; font-size: 0.8rem; color: var(--primary); }
.faq-item.active .faq-question .arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
  padding: 0 24px;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 18px; }
.faq-answer p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; }

/* ============ Contact Section ============ */
.contact-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 28px; text-align: center;
  border: 1px solid rgba(0,212,255,0.1);
}
.contact-card h4 { font-size: 1rem; font-weight: 600; color: var(--text-white); margin-bottom: 12px; }
.contact-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }
.contact-card .qr-img { width: 160px; height: 160px; margin: 12px auto; border-radius: var(--radius-sm); }

/* ============ How-To Guide ============ */
.howto-steps {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px; counter-reset: step;
}
.howto-step {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 24px; position: relative;
  border: 1px solid rgba(0,212,255,0.1);
  counter-increment: step;
}
.howto-step::before {
  content: counter(step);
  position: absolute; top: -12px; left: 20px;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--gradient-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem;
}
.howto-step h4 { font-size: 1rem; font-weight: 600; color: var(--text-white); margin-bottom: 8px; margin-top: 8px; }
.howto-step p { font-size: 0.85rem; color: var(--text-muted); }

/* ============ Footer ============ */
.site-footer {
  background: #060612; border-top: 1px solid rgba(255,45,120,0.1);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 32px; margin-bottom: 32px;
}
.footer-col h4 {
  font-size: 1rem; font-weight: 600; color: var(--text-white);
  margin-bottom: 16px; position: relative; padding-bottom: 8px;
}
.footer-col h4::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 30px; height: 2px; background: var(--primary);
}
.footer-col p, .footer-col a { font-size: 0.85rem; color: var(--text-muted); }
.footer-col a { display: block; margin-bottom: 8px; }
.footer-col a:hover { color: var(--primary); }
.footer-col .footer-logo { height: 36px; margin-bottom: 12px; }
.footer-qr { width: 120px; height: 120px; border-radius: var(--radius-sm); margin-top: 8px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 20px; text-align: center;
  font-size: 0.82rem; color: var(--text-muted);
}
.footer-bottom a { color: var(--primary); }

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

/* ============ Breadcrumb ============ */
.breadcrumb {
  padding: 14px 0; font-size: 0.82rem; color: var(--text-muted);
  margin-top: 68px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ============ Inner Page Hero ============ */
.inner-hero {
  padding: 100px 20px 50px;
  text-align: center;
  background: linear-gradient(180deg, rgba(123,47,255,0.08), transparent);
}
.inner-hero h1 { font-size: 2.2rem; font-weight: 700; color: var(--text-white); margin-bottom: 12px; }
.inner-hero p { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* ============ Responsive ============ */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .hero { min-height: 400px; padding: 60px 16px 40px; }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .header-inner { height: 56px; }
  .logo-img { height: 32px; }
  .logo-text { font-size: 1.1rem; }
  .main-nav {
    display: none; position: fixed; top: 56px; left: 0; right: 0;
    background: rgba(10,10,26,0.98); flex-direction: column;
    padding: 16px; gap: 4px;
    border-bottom: 1px solid rgba(255,45,120,0.15);
  }
  .main-nav.active { display: flex; }
  .mobile-toggle { display: block; }
  .search-bar-wrap { margin-top: 56px; }
  .hero-stats { gap: 20px; }
  .hero-stat .num { font-size: 1.5rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .service-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .btn-group { flex-direction: column; align-items: center; }
}

/* ============ Animations ============ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }

/* Lazy load placeholder */
.lazy { opacity: 0; transition: opacity 0.4s ease; }
.lazy.loaded { opacity: 1; }

/* Community features icons */
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.feature-item {
  background: var(--bg-card); border-radius: var(--radius-sm);
  padding: 20px 16px; text-align: center;
  border: 1px solid rgba(0,212,255,0.08);
  transition: var(--transition);
}
.feature-item:hover { border-color: var(--accent); }
.feature-item .icon { font-size: 2rem; margin-bottom: 8px; }
.feature-item h4 { font-size: 0.9rem; color: var(--text-white); margin-bottom: 4px; }
.feature-item p { font-size: 0.78rem; color: var(--text-muted); }

/* AI Section */
.ai-features {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, rgba(123,47,255,0.08), rgba(0,212,255,0.05));
  border-radius: var(--radius); padding: 28px;
  border: 1px solid rgba(0,212,255,0.12);
  transition: var(--transition);
}
.ai-card:hover { border-color: rgba(0,212,255,0.3); box-shadow: 0 0 20px rgba(0,212,255,0.15); }
.ai-card h3 { font-size: 1.05rem; font-weight: 600; color: var(--accent); margin-bottom: 10px; }
.ai-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }