/* ===================================
   蘑菇视频 - 主样式文件
   Glassmorphism · 深空梦幻科技风格
=================================== */

:root {
  --bg-primary: #111111;
  --bg-secondary: #1A1A1A;
  --accent-cyan: #A0F0FF;
  --accent-purple: #D8A0FF;
  --accent-warm: #F8F0E8;
  --glass-bg: rgba(255,255,255,0.06);
  --glass-border: rgba(255,255,255,0.12);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.4);
  --text-primary: #F8F0E8;
  --text-secondary: rgba(248,240,232,0.7);
  --text-muted: rgba(248,240,232,0.45);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ---- Particles Canvas ---- */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
}

/* ---- Utility ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; position: relative; z-index: 1; }
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 52px;
}
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 32px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: var(--transition);
  letter-spacing: 0.03em;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #111;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(160,240,255,0.35); }
.btn-outline {
  background: transparent;
  border: 1.5px solid rgba(160,240,255,0.5);
  color: var(--accent-cyan);
}
.btn-outline:hover { background: rgba(160,240,255,0.1); transform: translateY(-2px); }

/* ---- Gradient Orbs Background ---- */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.18;
}
.bg-orb-1 { width: 600px; height: 600px; background: var(--accent-cyan); top: -200px; left: -200px; }
.bg-orb-2 { width: 500px; height: 500px; background: var(--accent-purple); bottom: -150px; right: -150px; }
.bg-orb-3 { width: 400px; height: 400px; background: #FFB0D0; top: 40%; left: 40%; }

/* ---- Header / Navbar ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(17,17,17,0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: 0 24px;
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.nav-menu a {
  display: block;
  padding: 8px 14px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--accent-cyan);
  background: rgba(160,240,255,0.08);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 6px;
}

/* ---- Search Bar ---- */
.search-bar-wrap {
  background: rgba(26,26,26,0.9);
  border-bottom: 1px solid var(--glass-border);
  padding: 14px 24px;
  position: relative;
  z-index: 999;
}
.search-inner {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}
.search-input {
  width: 100%;
  padding: 12px 52px 12px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus { border-color: var(--accent-cyan); box-shadow: 0 0 0 3px rgba(160,240,255,0.12); }
.search-btn {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border: none;
  border-radius: 50px;
  padding: 8px 18px;
  color: #111;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.search-btn:hover { opacity: 0.85; }

/* ---- Hero Banner ---- */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  z-index: 1;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45) saturate(1.2);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(17,17,17,0.7) 0%, rgba(26,26,26,0.4) 50%, rgba(17,17,17,0.8) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 0 24px;
  margin: 0 auto;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(160,240,255,0.12);
  border: 1px solid rgba(160,240,255,0.3);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
  letter-spacing: 0.05em;
}
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 30%, var(--accent-cyan) 60%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-top: 52px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label { font-size: 0.82rem; color: var(--text-muted); margin-top: 2px; }

/* ---- Video Cards Grid ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.video-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}
.video-card:hover { transform: translateY(-6px); box-shadow: 0 20px 50px rgba(0,0,0,0.5); }
.video-thumb {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: var(--transition);
  opacity: 0;
}
.video-card:hover .video-play-btn {
  opacity: 1;
  background: rgba(0,0,0,0.35);
}
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(160,240,255,0.2);
  border: 2px solid rgba(160,240,255,0.6);
  backdrop-filter: blur(8px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--accent-cyan);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1.1); background: rgba(160,240,255,0.35); }
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #111;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 50px;
  letter-spacing: 0.04em;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 3px; }

/* ---- Danmaku (弹幕) ---- */
.danmaku-wrap {
  position: relative;
  height: 60px;
  overflow: hidden;
  margin: 20px 0;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
}
.danmaku-track {
  display: flex;
  gap: 60px;
  white-space: nowrap;
  animation: danmaku-scroll 30s linear infinite;
  padding: 18px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.danmaku-track span { color: var(--accent-cyan); }
@keyframes danmaku-scroll {
  from { transform: translateX(100vw); }
  to { transform: translateX(-200%); }
}

/* ---- Community Section ---- */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.topic-card {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}
.topic-card:hover { border-color: rgba(160,240,255,0.3); transform: translateY(-3px); }
.topic-tag {
  display: inline-block;
  background: rgba(160,240,255,0.12);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 50px;
  margin-bottom: 10px;
}
.topic-title { font-size: 0.95rem; font-weight: 600; margin-bottom: 8px; }
.topic-meta { font-size: 0.78rem; color: var(--text-muted); }

/* ---- AI Section ---- */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.ai-card {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  text-align: center;
}
.ai-card:hover { border-color: rgba(216,160,255,0.4); transform: translateY(-4px); box-shadow: 0 16px 40px rgba(216,160,255,0.1); }
.ai-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, rgba(160,240,255,0.15), rgba(216,160,255,0.15));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 16px;
  border: 1px solid var(--glass-border);
}
.ai-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.ai-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }

/* ---- Expert Section ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  padding: 28px 20px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); border-color: rgba(160,240,255,0.3); }
.expert-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 2px solid var(--glass-border);
  display: block;
}
.expert-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--accent-cyan); margin-bottom: 10px; }
.expert-bio { font-size: 0.83rem; color: var(--text-secondary); line-height: 1.6; }

/* ---- Testimonials ---- */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.testimonial-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}
.testimonial-card:hover { border-color: rgba(216,160,255,0.3); }
.testimonial-stars { color: #FFD700; font-size: 0.9rem; margin-bottom: 12px; }
.testimonial-text { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 10px; }
.testimonial-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 700; color: #111;
  flex-shrink: 0;
}
.testimonial-name { font-size: 0.88rem; font-weight: 600; }
.testimonial-date { font-size: 0.75rem; color: var(--text-muted); }

/* ---- Partners ---- */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-logo {
  padding: 14px 28px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}
.partner-logo:hover { color: var(--accent-cyan); border-color: rgba(160,240,255,0.3); }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 18px 20px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
}
.faq-question:hover { color: var(--accent-cyan); }
.faq-icon { font-size: 1.1rem; transition: transform 0.3s; flex-shrink: 0; color: var(--accent-cyan); }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding: 0 20px;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 20px 18px; }

/* ---- Contact / QR ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.contact-info h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 16px; }
.contact-info p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 10px; }
.contact-qr { text-align: center; }
.contact-qr img { width: 160px; height: 160px; border-radius: var(--radius-md); border: 2px solid var(--glass-border); }
.contact-qr p { font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; }

/* ---- Footer ---- */
.site-footer {
  background: rgba(10,10,10,0.95);
  border-top: 1px solid var(--glass-border);
  padding: 48px 24px 24px;
  position: relative;
  z-index: 1;
}
.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .brand-name { font-size: 1.2rem; font-weight: 800; margin-bottom: 10px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }
.footer-col h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 14px; color: var(--text-primary); }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-col ul a { font-size: 0.83rem; color: var(--text-muted); text-decoration: none; transition: var(--transition); }
.footer-col ul a:hover { color: var(--accent-cyan); }
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 34px; height: 34px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-social a:hover { color: var(--accent-cyan); border-color: rgba(160,240,255,0.3); }

/* ---- Inner Page Hero ---- */
.page-hero {
  padding: 80px 24px 60px;
  text-align: center;
  position: relative;
  z-index: 1;
  background: linear-gradient(180deg, rgba(160,240,255,0.04) 0%, transparent 100%);
  border-bottom: 1px solid var(--glass-border);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  justify-content: center;
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--accent-cyan); text-decoration: none; }
.breadcrumb span { color: var(--text-muted); }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-menu { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(17,17,17,0.97); border-bottom: 1px solid var(--glass-border); padding: 12px; gap: 2px; }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: block; }
  .hero { min-height: 70vh; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 56px 0; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .hero-btns { flex-direction: column; align-items: center; }
}

/* ---- Animations ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease forwards; }
.fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-delay-3 { animation-delay: 0.3s; opacity: 0; }

/* ---- Glow Divider ---- */
.glow-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), var(--accent-purple), transparent);
  margin: 0;
  opacity: 0.4;
}

/* ---- Video Section Label ---- */
.video-section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(160,240,255,0.1);
  border: 1px solid rgba(160,240,255,0.25);
  border-radius: 50px;
  padding: 5px 16px 5px 10px;
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 10px;
}
.video-dot {
  width: 8px; height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse-dot 1.5s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}