/* =============================================
   蘑菇视频官网 - 主样式文件
   暗黑潮流·霓虹金紫·赛博科技风
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --bg-primary: #080810;
  --bg-secondary: #0d0d1a;
  --bg-card: #111125;
  --neon-purple: #b06aff;
  --neon-gold: #ffd700;
  --neon-cyan: #00e5ff;
  --neon-pink: #ff2d78;
  --text-primary: #f0f0ff;
  --text-secondary: #9090b0;
  --text-muted: #5050708;
  --border-glow: rgba(176,106,255,0.3);
  --gradient-main: linear-gradient(135deg, #b06aff 0%, #ffd700 100%);
  --gradient-dark: linear-gradient(180deg, #0d0d1a 0%, #080810 100%);
  --shadow-neon: 0 0 20px rgba(176,106,255,0.4), 0 0 40px rgba(176,106,255,0.2);
  --shadow-gold: 0 0 20px rgba(255,215,0,0.4), 0 0 40px rgba(255,215,0,0.2);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --radius: 12px;
  --radius-lg: 20px;
}

/* ---- 重置与基础 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--neon-purple); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--neon-gold); }
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(8,8,16,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glow);
  padding: 0 5%;
}
.header-inner {
  display: flex; align-items: center;
  justify-content: space-between;
  height: 70px; max-width: 1400px; margin: 0 auto;
}
.site-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.4rem; font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}
.site-logo img { width: 42px; height: 42px; border-radius: 8px; }
.main-nav { display: flex; gap: 6px; align-items: center; }
.main-nav a {
  color: var(--text-secondary); font-size: 0.9rem;
  padding: 6px 14px; border-radius: 20px;
  transition: var(--transition); white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--neon-gold);
  background: rgba(176,106,255,0.15);
  box-shadow: 0 0 10px rgba(176,106,255,0.2);
}
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 8px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--neon-purple); border-radius: 2px;
  transition: var(--transition);
}

/* ---- 搜索框 ---- */
.search-bar-wrap {
  background: rgba(13,13,26,0.95);
  border-bottom: 1px solid rgba(176,106,255,0.15);
  padding: 10px 5%;
}
.search-bar-inner {
  max-width: 700px; margin: 0 auto;
  display: flex; gap: 0; position: relative;
}
.search-input {
  flex: 1; background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-glow);
  border-right: none;
  color: var(--text-primary);
  padding: 10px 18px; font-size: 0.95rem;
  border-radius: var(--radius) 0 0 var(--radius);
  outline: none; transition: var(--transition);
}
.search-input::placeholder { color: var(--text-secondary); }
.search-input:focus {
  border-color: var(--neon-purple);
  box-shadow: 0 0 12px rgba(176,106,255,0.25);
}
.search-btn {
  background: var(--gradient-main);
  border: none; color: #000; font-weight: 700;
  padding: 10px 24px; cursor: pointer;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem; transition: var(--transition);
}
.search-btn:hover { opacity: 0.85; transform: scale(1.02); }

/* ---- 通用容器 ---- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 5%; }
.section { padding: 80px 0; position: relative; z-index: 1; }
.section-alt { background: rgba(13,13,26,0.6); }

/* ---- 节标题 ---- */
.section-header { text-align: center; margin-bottom: 50px; }
.section-tag {
  display: inline-block;
  background: rgba(176,106,255,0.15);
  border: 1px solid var(--border-glow);
  color: var(--neon-purple); font-size: 0.8rem;
  padding: 4px 14px; border-radius: 20px;
  letter-spacing: 2px; margin-bottom: 14px;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 900; line-height: 1.3;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 14px;
}
.section-desc { color: var(--text-secondary); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* ---- 首屏Banner ---- */
.hero-section {
  min-height: 90vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #080810 0%, #130a2e 50%, #0a1a10 100%);
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover; background-position: center;
  opacity: 0.35; z-index: 0;
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(135deg, rgba(8,8,16,0.7) 0%, rgba(13,0,30,0.5) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1280px; margin: 0 auto; padding: 0 5%;
  width: 100%;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(176,106,255,0.15);
  border: 1px solid var(--border-glow);
  border-radius: 30px; padding: 6px 18px;
  font-size: 0.85rem; color: var(--neon-purple);
  margin-bottom: 24px; letter-spacing: 1px;
}
.hero-badge::before {
  content: ''; width: 8px; height: 8px;
  background: var(--neon-purple); border-radius: 50%;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 900; line-height: 1.1;
  margin-bottom: 20px;
}
.hero-title .brand-name {
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-title .glow-text {
  text-shadow: 0 0 30px rgba(176,106,255,0.6);
}
.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary); max-width: 600px;
  margin-bottom: 36px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  background: var(--gradient-main);
  color: #000; font-weight: 800;
  padding: 14px 32px; border-radius: 30px;
  font-size: 1rem; border: none; cursor: pointer;
  transition: var(--transition); display: inline-flex;
  align-items: center; gap: 8px;
  box-shadow: var(--shadow-neon);
}
.btn-primary:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 0 30px rgba(176,106,255,0.6);
  color: #000;
}
.btn-outline {
  background: transparent;
  border: 2px solid var(--neon-purple);
  color: var(--neon-purple); font-weight: 700;
  padding: 12px 30px; border-radius: 30px;
  font-size: 1rem; cursor: pointer;
  transition: var(--transition); display: inline-flex;
  align-items: center; gap: 8px;
}
.btn-outline:hover {
  background: rgba(176,106,255,0.15);
  transform: translateY(-3px);
  box-shadow: var(--shadow-neon);
  color: var(--neon-purple);
}
.hero-stats {
  display: flex; gap: 40px; margin-top: 50px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 2rem; font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label { font-size: 0.8rem; color: var(--text-secondary); margin-top: 4px; }

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border: 1px solid rgba(176,106,255,0.15);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: var(--transition); cursor: pointer;
  position: relative;
}
.video-card:hover {
  transform: translateY(-8px);
  border-color: var(--neon-purple);
  box-shadow: var(--shadow-neon);
}
.video-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-btn {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.5);
  opacity: 0; transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 60px; height: 60px;
  background: var(--gradient-main);
  border-radius: 50%; display: flex;
  align-items: center; justify-content: center;
  box-shadow: 0 0 30px rgba(176,106,255,0.6);
  animation: playPulse 1.5s infinite;
}
@keyframes playPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(176,106,255,0.4); }
  50% { box-shadow: 0 0 40px rgba(176,106,255,0.8), 0 0 60px rgba(255,215,0,0.3); }
}
.play-icon::after {
  content: ''; border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #000;
  margin-left: 4px;
}
.video-duration {
  position: absolute; bottom: 8px; right: 10px;
  background: rgba(0,0,0,0.8); color: #fff;
  font-size: 0.75rem; padding: 2px 8px; border-radius: 4px;
}
.video-tag {
  position: absolute; top: 10px; left: 10px;
  background: var(--gradient-main); color: #000;
  font-size: 0.7rem; font-weight: 700;
  padding: 3px 10px; border-radius: 20px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem; font-weight: 700;
  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: 14px;
  font-size: 0.8rem; color: var(--text-secondary);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.video-tag-item {
  font-size: 0.72rem; color: var(--neon-purple);
  background: rgba(176,106,255,0.1);
  border: 1px solid rgba(176,106,255,0.2);
  padding: 2px 8px; border-radius: 10px;
}

/* ---- 社区模块 ---- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.community-card {
  background: var(--bg-card);
  border: 1px solid rgba(176,106,255,0.15);
  border-radius: var(--radius-lg); padding: 28px;
  transition: var(--transition); position: relative; overflow: hidden;
}
.community-card::before {
  content: ''; position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-main);
}
.community-card:hover {
  transform: translateY(-6px);
  border-color: var(--neon-purple);
  box-shadow: var(--shadow-neon);
}
.topic-tag {
  font-size: 1.1rem; font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 10px;
}
.topic-desc { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 16px; }
.topic-hot {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--neon-pink); font-size: 0.85rem; font-weight: 700;
}
.topic-hot::before { content: '🔥'; }

/* ---- 弹幕展示 ---- */
.danmaku-wrap {
  overflow: hidden; height: 80px;
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius); margin: 30px 0;
  position: relative; border: 1px solid rgba(176,106,255,0.1);
}
.danmaku-track {
  display: flex; align-items: center;
  height: 100%; white-space: nowrap;
  animation: danmakuScroll 30s linear infinite;
}
.danmaku-item {
  display: inline-flex; align-items: center; gap: 8px;
  margin-right: 60px; font-size: 0.9rem;
  color: var(--text-secondary);
}
.danmaku-item .dm-user { color: var(--neon-purple); font-weight: 700; }
@keyframes danmakuScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ---- AI模块 ---- */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.ai-card {
  background: var(--bg-card);
  border: 1px solid rgba(176,106,255,0.15);
  border-radius: var(--radius-lg); padding: 32px 24px;
  text-align: center; transition: var(--transition);
  position: relative; overflow: hidden;
}
.ai-card::after {
  content: ''; position: absolute;
  bottom: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-main);
  transform: scaleX(0); transition: var(--transition);
}
.ai-card:hover::after { transform: scaleX(1); }
.ai-card:hover {
  transform: translateY(-8px);
  border-color: var(--neon-purple);
  box-shadow: var(--shadow-neon);
}
.ai-icon {
  font-size: 2.5rem; margin-bottom: 16px;
  display: block; filter: drop-shadow(0 0 10px rgba(176,106,255,0.5));
}
.ai-card h3 {
  font-size: 1.1rem; font-weight: 800;
  color: var(--text-primary); margin-bottom: 10px;
}
.ai-card p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.6; }

/* ---- 专家模块 ---- */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 30px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid rgba(176,106,255,0.15);
  border-radius: var(--radius-lg); padding: 30px 20px;
  text-align: center; transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-8px);
  border-color: var(--neon-gold);
  box-shadow: var(--shadow-gold);
}
.expert-avatar {
  width: 90px; height: 90px; border-radius: 50%;
  margin: 0 auto 16px; overflow: hidden;
  border: 3px solid var(--neon-purple);
  box-shadow: 0 0 20px rgba(176,106,255,0.4);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-name {
  font-size: 1.05rem; font-weight: 800;
  color: var(--text-primary); margin-bottom: 6px;
}
.expert-title {
  font-size: 0.82rem; color: var(--neon-purple);
  background: rgba(176,106,255,0.1);
  padding: 3px 12px; border-radius: 20px;
  display: inline-block; margin-bottom: 12px;
}
.expert-desc { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.6; }

/* ---- 评价模块 ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid rgba(176,106,255,0.15);
  border-radius: var(--radius-lg); padding: 28px;
  transition: var(--transition); position: relative;
}
.review-card:hover {
  border-color: var(--neon-gold);
  box-shadow: var(--shadow-gold);
  transform: translateY(-4px);
}
.review-quote {
  font-size: 3rem; line-height: 1;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 12px;
}
.review-text {
  color: var(--text-secondary); font-size: 0.92rem;
  line-height: 1.7; margin-bottom: 20px;
}
.review-user { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  border: 2px solid var(--neon-purple); overflow: hidden;
}
.review-avatar img { width: 100%; height: 100%; object-fit: cover; }
.review-name { font-weight: 700; font-size: 0.9rem; color: var(--text-primary); }
.review-stars { color: var(--neon-gold); font-size: 0.8rem; margin-top: 2px; }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid rgba(176,106,255,0.15);
  border-radius: var(--radius); margin-bottom: 12px;
  overflow: hidden; transition: var(--transition);
}
.faq-item:hover { border-color: var(--neon-purple); }
.faq-question {
  padding: 18px 24px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-card); font-weight: 700;
  font-size: 0.95rem; color: var(--text-primary);
  transition: var(--transition);
}
.faq-question:hover { color: var(--neon-gold); }
.faq-question .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 {
  padding: 0 24px; max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7;
  background: rgba(176,106,255,0.03);
}
.faq-item.open .faq-answer { max-height: 200px; padding: 16px 24px; }

/* ---- 合作伙伴 ---- */
.partners-grid {
  display: flex; flex-wrap: wrap;
  justify-content: center; gap: 20px;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid rgba(176,106,255,0.15);
  border-radius: var(--radius); padding: 16px 28px;
  font-size: 0.9rem; font-weight: 700;
  color: var(--text-secondary); transition: var(--transition);
  min-width: 120px; text-align: center;
}
.partner-item:hover {
  color: var(--neon-gold);
  border-color: var(--neon-gold);
  box-shadow: var(--shadow-gold);
  transform: translateY(-4px);
}

/* ---- 联系模块 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px; align-items: start;
}
.contact-info h3 {
  font-size: 1.4rem; font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 20px;
}
.contact-item {
  display: flex; gap: 14px; align-items: flex-start;
  margin-bottom: 18px;
}
.contact-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: rgba(176,106,255,0.15);
  border: 1px solid var(--border-glow);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.contact-label { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 4px; }
.contact-value { font-size: 0.95rem; color: var(--text-primary); font-weight: 600; }
.qr-row { display: flex; gap: 24px; margin-top: 24px; }
.qr-item { text-align: center; }
.qr-item img {
  width: 100px; height: 100px; border-radius: 10px;
  border: 2px solid var(--border-glow);
  margin-bottom: 8px;
}
.qr-item p { font-size: 0.8rem; color: var(--text-secondary); }

/* ---- 页脚 ---- */
.site-footer {
  background: rgba(8,8,16,0.98);
  border-top: 1px solid var(--border-glow);
  padding: 50px 5% 30px;
  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 { margin-bottom: 16px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.7; }
.footer-col h4 {
  font-size: 0.95rem; font-weight: 800;
  color: var(--text-primary); margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(176,106,255,0.2);
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  color: var(--text-secondary); font-size: 0.88rem;
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--neon-gold); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(176,106,255,0.1);
  padding-top: 24px;
  display: flex; justify-content: space-between;
  align-items: center; flex-wrap: gap;
  font-size: 0.82rem; color: var(--text-secondary);
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-secondary); font-size: 0.82rem; }
.footer-links a:hover { color: var(--neon-purple); }
.update-time { color: var(--neon-purple); font-size: 0.82rem; }

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 14px 0; font-size: 0.85rem;
  color: var(--text-secondary);
}
.breadcrumb a { color: var(--neon-purple); }
.breadcrumb span { margin: 0 6px; }

/* ---- 页面标题区 ---- */
.page-hero {
  padding: 60px 0 40px;
  background: linear-gradient(180deg, rgba(13,0,30,0.6) 0%, transparent 100%);
  text-align: center; position: relative; z-index: 1;
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 12px;
}
.page-hero p { color: var(--text-secondary); font-size: 1rem; }

/* ---- 加入社区引导 ---- */
.join-section {
  background: linear-gradient(135deg, rgba(176,106,255,0.1) 0%, rgba(255,215,0,0.05) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg); padding: 50px;
  text-align: center; margin: 60px 0;
}
.join-section h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 900; margin-bottom: 14px;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.join-section p { color: var(--text-secondary); margin-bottom: 28px; }
.join-steps {
  display: flex; justify-content: center;
  gap: 30px; flex-wrap: wrap; margin-bottom: 32px;
}
.join-step {
  text-align: center; max-width: 160px;
}
.join-step .step-num {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--gradient-main);
  color: #000; font-weight: 900; font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 10px;
}
.join-step p { font-size: 0.88rem; 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: 70px; left: 0; right: 0; flex-direction: column; background: rgba(8,8,16,0.98); padding: 20px; border-bottom: 1px solid var(--border-glow); gap: 4px; }
  .main-nav.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero-section { min-height: 70vh; }
  .hero-stats { gap: 24px; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .join-section { padding: 30px 20px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}
@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .video-grid { grid-template-columns: 1fr; }
}

/* ---- 滚动条美化 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--neon-purple); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--neon-gold); }

/* ---- 选中文字 ---- */
::selection { background: rgba(176,106,255,0.3); color: var(--text-primary); }