/* =============================================
   蘑菇视频官网 - 主样式文件
   暗黑潮流·霓虹金紫·沉浸式科技娱乐风格
   ============================================= */

/* --- 全局重置与基础 --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --neon-gold: #f0c040;
  --neon-purple: #b44fff;
  --neon-pink: #ff4fcb;
  --dark-bg: #0a0a0f;
  --dark-card: #111118;
  --dark-border: #1e1e2e;
  --text-primary: #f0f0f0;
  --text-secondary: #aaaacc;
  --gradient-gp: linear-gradient(135deg, #b44fff 0%, #f0c040 100%);
  --gradient-pg: linear-gradient(135deg, #f0c040 0%, #b44fff 100%);
  --shadow-neon: 0 0 20px rgba(180, 79, 255, 0.4), 0 0 40px rgba(240, 192, 64, 0.2);
  --shadow-card: 0 4px 30px rgba(0,0,0,0.6);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

a { color: var(--neon-gold); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--neon-purple); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }

/* --- 粒子背景 --- */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* --- 顶部导航 --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dark-border);
  padding: 0 24px;
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: var(--gradient-gp);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-gp);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  -webkit-text-fill-color: #fff;
  flex-shrink: 0;
}

.main-nav { display: flex; align-items: center; gap: 4px; }

.main-nav a {
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--neon-gold);
  background: rgba(240, 192, 64, 0.1);
}

.nav-cta {
  background: var(--gradient-gp) !important;
  color: #fff !important;
  -webkit-text-fill-color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 20px !important;
  font-weight: 700 !important;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(180, 79, 255, 0.5);
  background: var(--gradient-pg) !important;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--neon-gold);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- 搜索框 --- */
.search-bar-wrap {
  background: rgba(17, 17, 24, 0.95);
  border-bottom: 1px solid var(--dark-border);
  padding: 12px 24px;
}

.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.search-form {
  display: flex;
  align-items: center;
  background: rgba(30, 30, 46, 0.8);
  border: 1px solid var(--dark-border);
  border-radius: 30px;
  padding: 0 20px;
  max-width: 640px;
  margin: 0 auto;
  transition: var(--transition);
}

.search-form:focus-within {
  border-color: var(--neon-purple);
  box-shadow: 0 0 15px rgba(180, 79, 255, 0.3);
}

.search-form input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 12px 0;
}

.search-form input::placeholder { color: var(--text-secondary); }

.search-form button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--neon-gold);
  font-size: 1.1rem;
  padding: 8px;
  transition: var(--transition);
}

.search-form button:hover { color: var(--neon-purple); transform: scale(1.1); }

/* --- 通用容器 --- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* --- 章节标题 --- */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  background: rgba(180, 79, 255, 0.15);
  border: 1px solid var(--neon-purple);
  color: var(--neon-purple);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  line-height: 1.3;
  background: var(--gradient-gp);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto;
}

/* --- Hero Banner --- */
.hero-section {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  z-index: 1;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/banner_hero.jpg');
  background-size: cover;
  background-position: center;
  z-index: -1;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(10,10,15,0.85) 0%,
    rgba(10,10,15,0.6) 50%,
    rgba(10,10,15,0.85) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 60px 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(240, 192, 64, 0.1);
  border: 1px solid var(--neon-gold);
  color: var(--neon-gold);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 8px rgba(240, 192, 64, 0.3); }
  50% { box-shadow: 0 0 20px rgba(240, 192, 64, 0.6); }
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.8);
}

.hero-title .brand-highlight {
  background: var(--gradient-gp);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-gp);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 32px;
  border-radius: 30px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(180, 79, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(180, 79, 255, 0.6);
  color: #fff;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--neon-gold);
  font-size: 1rem;
  font-weight: 700;
  padding: 13px 30px;
  border-radius: 30px;
  border: 2px solid var(--neon-gold);
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(240, 192, 64, 0.1);
  transform: translateY(-2px);
  color: var(--neon-gold);
}

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.hero-stat { text-align: left; }

.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 900;
  background: var(--gradient-gp);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* --- 通用 Section --- */
.section { padding: 80px 0; position: relative; z-index: 1; }
.section-alt { background: rgba(17, 17, 24, 0.6); }

/* --- 视频卡片网格 --- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  box-shadow: var(--shadow-card);
}

.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--neon-purple);
  box-shadow: var(--shadow-neon);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #1a1a2e;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img { transform: scale(1.05); }

.play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.video-card:hover .play-overlay { opacity: 1; }

.play-btn {
  width: 60px;
  height: 60px;
  background: var(--gradient-gp);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 0 30px rgba(180, 79, 255, 0.7);
  transform: scale(0.8);
  transition: var(--transition);
}

.video-card:hover .play-btn { transform: scale(1); }

.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(180, 79, 255, 0.9);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
}

.video-badge.hot { background: rgba(255, 79, 79, 0.9); }
.video-badge.new { background: rgba(240, 192, 64, 0.9); color: #000; }

.video-info { padding: 16px; }

.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.video-meta span { display: flex; align-items: center; gap: 4px; }

/* --- 社区模块 --- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.topic-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.topic-card:hover {
  border-color: var(--neon-gold);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(240, 192, 64, 0.2);
}

.topic-tag {
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-gold);
  margin-bottom: 8px;
}

.topic-hot {
  font-size: 0.8rem;
  color: var(--neon-purple);
  font-weight: 600;
  margin-bottom: 10px;
}

.topic-desc { font-size: 0.9rem; color: var(--text-secondary); }

/* --- 弹幕展示 --- */
.danmaku-wrap {
  background: rgba(17, 17, 24, 0.8);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 20px;
  overflow: hidden;
  position: relative;
  height: 120px;
  margin-top: 32px;
}

.danmaku-track {
  position: absolute;
  white-space: nowrap;
  animation: danmaku-scroll 18s linear infinite;
  display: flex;
  gap: 48px;
  align-items: center;
  top: 50%;
  transform: translateY(-50%);
}

.danmaku-track:nth-child(2) { animation-delay: -9s; top: 30%; }
.danmaku-track:nth-child(3) { animation-delay: -4s; top: 70%; }

@keyframes danmaku-scroll {
  from { transform: translateX(100vw) translateY(-50%); }
  to { transform: translateX(-100%) translateY(-50%); }
}

.danmaku-item {
  font-size: 0.85rem;
  padding: 4px 12px;
  border-radius: 12px;
  background: rgba(180, 79, 255, 0.15);
  border: 1px solid rgba(180, 79, 255, 0.3);
  color: var(--text-primary);
  flex-shrink: 0;
}

.danmaku-item:nth-child(odd) {
  background: rgba(240, 192, 64, 0.1);
  border-color: rgba(240, 192, 64, 0.3);
  color: var(--neon-gold);
}

/* --- AI模块 --- */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.ai-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.ai-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-gp);
  transform: scaleX(0);
  transition: var(--transition);
}

.ai-card:hover::before { transform: scaleX(1); }

.ai-card:hover {
  border-color: var(--neon-purple);
  transform: translateY(-4px);
  box-shadow: var(--shadow-neon);
}

.ai-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}

.ai-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-gold);
  margin-bottom: 10px;
}

.ai-card p { font-size: 0.85rem; color: var(--text-secondary); }

/* --- 专家模块 --- */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.expert-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}

.expert-card:hover {
  border-color: var(--neon-gold);
  transform: translateY(-4px);
  box-shadow: 0 0 25px rgba(240, 192, 64, 0.2);
}

.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid transparent;
  background: var(--gradient-gp) border-box;
  box-shadow: 0 0 15px rgba(180, 79, 255, 0.4);
}

.expert-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.expert-title {
  font-size: 0.8rem;
  color: var(--neon-purple);
  font-weight: 600;
  margin-bottom: 10px;
}

.expert-desc { font-size: 0.85rem; color: var(--text-secondary); }

/* --- 用户评价 --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  position: relative;
}

.review-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 4rem;
  color: rgba(180, 79, 255, 0.15);
  font-family: Georgia, serif;
  line-height: 1;
}

.review-card:hover {
  border-color: var(--neon-purple);
  transform: translateY(-3px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--neon-purple);
}

.review-user { font-weight: 700; font-size: 0.95rem; }

.review-stars {
  color: var(--neon-gold);
  font-size: 0.85rem;
  margin-top: 2px;
}

.review-content {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- 合作伙伴 --- */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  margin-bottom: 48px;
}

.partner-item {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-sm);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}

.partner-item:hover {
  border-color: var(--neon-gold);
  color: var(--neon-gold);
  transform: translateY(-2px);
}

/* --- FAQ --- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover { border-color: var(--neon-purple); }

.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
  user-select: none;
}

.faq-question:hover { color: var(--neon-gold); }

.faq-icon {
  font-size: 1.2rem;
  color: var(--neon-purple);
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-icon { transform: rotate(45deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 18px;
}

/* --- 联系模块 --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--neon-gold);
  margin-bottom: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-item .icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 2px; }

.qr-group { display: flex; gap: 24px; margin-top: 24px; }

.qr-item { text-align: center; }

.qr-item img {
  width: 110px;
  height: 110px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 2px solid var(--dark-border);
  margin-bottom: 8px;
}

.qr-item span { font-size: 0.78rem; color: var(--text-secondary); }

.join-guide {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 28px;
}

.join-guide h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--neon-purple);
  margin-bottom: 16px;
}

.join-steps { display: flex; flex-direction: column; gap: 12px; }

.join-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.step-num {
  width: 28px;
  height: 28px;
  background: var(--gradient-gp);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

/* --- 页脚 --- */
.site-footer {
  background: rgba(8, 8, 12, 0.98);
  border-top: 1px solid var(--dark-border);
  padding: 48px 24px 24px;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .site-logo {
  font-size: 1.3rem;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer-social { display: flex; gap: 10px; }

.social-btn {
  width: 36px;
  height: 36px;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.social-btn:hover {
  border-color: var(--neon-gold);
  color: var(--neon-gold);
  transform: translateY(-2px);
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--dark-border);
}

.footer-col ul { display: flex; flex-direction: column; gap: 8px; }

.footer-col ul li a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.footer-col ul li a:hover { color: var(--neon-gold); padding-left: 4px; }

.footer-bottom {
  border-top: 1px solid var(--dark-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.footer-bottom a { color: var(--text-secondary); }
.footer-bottom a:hover { color: var(--neon-gold); }

/* --- 内页通用 --- */
.inner-hero {
  padding: 80px 24px 60px;
  text-align: center;
  background: linear-gradient(180deg, rgba(180,79,255,0.08) 0%, transparent 100%);
  border-bottom: 1px solid var(--dark-border);
  position: relative;
  z-index: 1;
}

.inner-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  background: var(--gradient-gp);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.inner-hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
  gap: 8px;
  align-items: center;
}

.breadcrumb a { color: var(--neon-gold); }
.breadcrumb span { color: var(--text-secondary); }

/* --- 滚动动画 --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- 响应式 --- */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; background: rgba(10,10,15,0.98); border-bottom: 1px solid var(--dark-border); padding: 16px; gap: 4px; }
  .main-nav.open { display: flex; }
  .hamburger { display: flex; }
  .hero-content { padding: 40px 24px; }
  .hero-stats { gap: 20px; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .experts-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  .video-grid { grid-template-columns: 1fr; }
}

/* --- 霓虹线条装饰 --- */
.neon-line {
  height: 1px;
  background: var(--gradient-gp);
  opacity: 0.4;
  margin: 0;
}

/* --- 加载动画 --- */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(90deg, var(--dark-card) 25%, rgba(255,255,255,0.05) 50%, var(--dark-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}