/* ===== 91网 · 全站样式 ===== */
:root {
  --bg-dark: #0a0a0f;
  --bg-card: #111118;
  --bg-card2: #16161f;
  --neon-purple: #9b30ff;
  --neon-gold: #f0c040;
  --neon-pink: #ff2d78;
  --neon-blue: #00d4ff;
  --text-primary: #f0f0f8;
  --text-secondary: #a0a0c0;
  --text-muted: #606080;
  --border-glow: rgba(155, 48, 255, 0.3);
  --gradient-hero: linear-gradient(135deg, #0a0a0f 0%, #1a0a2e 50%, #0a0a1a 100%);
  --gradient-card: linear-gradient(145deg, #111118, #1a1a28);
  --gradient-neon: linear-gradient(90deg, #9b30ff, #f0c040);
  --gradient-btn: linear-gradient(90deg, #9b30ff 0%, #ff2d78 100%);
  --shadow-glow: 0 0 20px rgba(155, 48, 255, 0.4);
  --shadow-gold: 0 0 20px rgba(240, 192, 64, 0.3);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ===== 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(16px);
  border-bottom: 1px solid var(--border-glow);
  padding: 0 24px;
}
.header-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;
  text-decoration: none;
}
.logo-icon {
  width: 40px; height: 40px;
  background: var(--gradient-btn);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; box-shadow: var(--shadow-glow);
}
.logo-text {
  font-size: 20px; font-weight: 700;
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 14px;
  transition: var(--transition);
  white-space: nowrap;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--neon-gold);
  background: rgba(155, 48, 255, 0.12);
}
.nav-btn {
  background: var(--gradient-btn) !important;
  color: #fff !important;
  padding: 7px 18px !important;
  border-radius: 20px !important;
  font-weight: 600 !important;
  box-shadow: var(--shadow-glow);
}
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 4px;
}
.hamburger 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(155, 48, 255, 0.06);
  border-bottom: 1px solid rgba(155, 48, 255, 0.15);
  padding: 12px 24px;
}
.search-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 12px;
}
.search-box {
  flex: 1; max-width: 640px;
  display: flex; align-items: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-glow);
  border-radius: 24px; overflow: hidden;
  transition: var(--transition);
}
.search-box:focus-within {
  border-color: var(--neon-purple);
  box-shadow: 0 0 12px rgba(155,48,255,0.3);
}
.search-box input {
  flex: 1; background: transparent;
  border: none; outline: none;
  color: var(--text-primary);
  padding: 10px 18px;
  font-size: 14px;
}
.search-box input::placeholder { color: var(--text-muted); }
.search-btn {
  background: var(--gradient-btn);
  border: none; color: #fff;
  padding: 10px 20px; cursor: pointer;
  font-size: 14px; font-weight: 600;
  transition: var(--transition);
}
.search-btn:hover { opacity: 0.85; }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tag {
  background: rgba(155,48,255,0.1);
  border: 1px solid rgba(155,48,255,0.2);
  color: var(--text-secondary);
  padding: 4px 12px; border-radius: 12px;
  font-size: 12px; cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { color: var(--neon-gold); border-color: var(--neon-gold); }

/* ===== 通用容器 ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; position: relative; z-index: 1; }
.section-alt { background: rgba(155,48,255,0.03); }
.section-title {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  margin-bottom: 12px;
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-sub {
  color: var(--text-secondary);
  font-size: 15px; margin-bottom: 48px;
}
.section-header { margin-bottom: 48px; }
.badge {
  display: inline-block;
  background: rgba(155,48,255,0.15);
  border: 1px solid rgba(155,48,255,0.3);
  color: var(--neon-purple);
  padding: 4px 14px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
  margin-bottom: 12px; letter-spacing: 1px;
}

/* ===== Hero Banner ===== */
.hero-section {
  position: relative; min-height: 92vh;
  display: flex; align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}
.hero-bg-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; opacity: 0.25;
  z-index: 1;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to right, rgba(10,10,15,0.95) 40%, rgba(10,10,15,0.4) 100%);
  z-index: 2;
}
.hero-content {
  position: relative; z-index: 3;
  max-width: 640px;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(155,48,255,0.12);
  border: 1px solid rgba(155,48,255,0.3);
  color: var(--neon-purple);
  padding: 6px 16px; border-radius: 20px;
  font-size: 13px; font-weight: 600;
  margin-bottom: 24px;
}
.hero-eyebrow::before {
  content: ''; width: 6px; height: 6px;
  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(1.4); }
}
.hero-title {
  font-size: clamp(36px, 5vw, 68px);
  font-weight: 900; line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-title .brand {
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  color: var(--text-secondary);
  font-size: 17px; line-height: 1.8;
  margin-bottom: 36px;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--gradient-btn);
  color: #fff; text-decoration: none;
  padding: 14px 32px; border-radius: 28px;
  font-size: 16px; font-weight: 700;
  box-shadow: var(--shadow-glow);
  transition: var(--transition);
  border: none; cursor: pointer;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(155,48,255,0.5); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent;
  color: var(--neon-gold); text-decoration: none;
  padding: 13px 32px; border-radius: 28px;
  font-size: 16px; font-weight: 700;
  border: 2px solid var(--neon-gold);
  transition: var(--transition);
}
.btn-outline:hover {
  background: rgba(240,192,64,0.1);
  box-shadow: var(--shadow-gold);
  transform: translateY(-2px);
}
.hero-stats {
  display: flex; gap: 40px; margin-top: 48px;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 28px; font-weight: 800;
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { color: var(--text-muted); font-size: 12px; margin-top: 2px; }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--gradient-card);
  border: 1px solid rgba(155,48,255,0.15);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--neon-purple);
  box-shadow: var(--shadow-glow);
}
.video-thumb {
  position: relative; aspect-ratio: 16/9;
  overflow: hidden; background: #0d0d18;
}
.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-circle {
  width: 60px; height: 60px;
  background: rgba(155,48,255,0.9);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 30px rgba(155,48,255,0.7);
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-circle { transform: scale(1); }
.play-circle svg { width: 24px; height: 24px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff; font-size: 12px; font-weight: 600;
  padding: 2px 8px; border-radius: 4px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 15px; 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;
  color: var(--text-muted); font-size: 12px;
}
.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: 20px;
}
.topic-card {
  background: var(--gradient-card);
  border: 1px solid rgba(155,48,255,0.15);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.topic-card:hover {
  border-color: var(--neon-gold);
  box-shadow: var(--shadow-gold);
  transform: translateY(-4px);
}
.topic-tag {
  color: var(--neon-gold);
  font-size: 16px; font-weight: 700;
  margin-bottom: 8px;
}
.topic-hot {
  color: var(--neon-pink);
  font-size: 13px; font-weight: 600;
  margin-bottom: 10px;
}
.topic-desc { color: var(--text-secondary); font-size: 14px; }

/* 弹幕滚动 */
.danmaku-wrap {
  overflow: hidden; height: 40px;
  background: rgba(155,48,255,0.05);
  border: 1px solid rgba(155,48,255,0.1);
  border-radius: 8px; margin-bottom: 40px;
}
.danmaku-track {
  display: flex; gap: 40px;
  white-space: nowrap;
  animation: danmaku-scroll 30s linear infinite;
  padding: 10px 0;
}
@keyframes danmaku-scroll {
  0% { transform: translateX(100vw); }
  100% { transform: translateX(-200%); }
}
.danmaku-item {
  color: var(--text-secondary); font-size: 13px;
  display: inline-flex; align-items: center; gap: 6px;
}
.danmaku-item::before {
  content: '💬'; font-size: 12px;
}

/* ===== AI模块 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.ai-tool-card {
  background: var(--gradient-card);
  border: 1px solid rgba(0,212,255,0.15);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}
.ai-tool-card:hover {
  border-color: var(--neon-blue);
  box-shadow: 0 0 20px rgba(0,212,255,0.2);
  transform: translateY(-4px);
}
.ai-icon {
  font-size: 40px; margin-bottom: 16px;
  display: block;
}
.ai-tool-name {
  font-size: 16px; font-weight: 700;
  color: var(--neon-blue); margin-bottom: 8px;
}
.ai-tool-desc { color: var(--text-secondary); font-size: 13px; }

/* ===== 专家模块 ===== */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid rgba(155,48,255,0.15);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  border-color: var(--neon-purple);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}
.expert-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--neon-purple);
  margin: 0 auto 16px;
  display: block;
  box-shadow: var(--shadow-glow);
}
.expert-name {
  font-size: 16px; font-weight: 700;
  color: var(--text-primary); margin-bottom: 4px;
}
.expert-title {
  color: var(--neon-gold); font-size: 13px;
  margin-bottom: 10px;
}
.expert-desc { color: var(--text-secondary); font-size: 13px; }

/* ===== 评价模块 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--gradient-card);
  border: 1px solid rgba(155,48,255,0.12);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover {
  border-color: var(--neon-gold);
  transform: translateY(-3px);
}
.review-stars { color: var(--neon-gold); font-size: 16px; margin-bottom: 12px; }
.review-text {
  color: var(--text-secondary); font-size: 14px;
  line-height: 1.7; margin-bottom: 16px;
  font-style: italic;
}
.review-user {
  display: flex; align-items: center; gap: 10px;
}
.review-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--gradient-btn);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: #fff;
}
.review-name { font-size: 14px; font-weight: 600; color: var(--text-primary); }
.review-date { font-size: 12px; color: var(--text-muted); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; }
.faq-item {
  background: var(--gradient-card);
  border: 1px solid rgba(155,48,255,0.12);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--neon-purple); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; cursor: pointer;
  font-size: 15px; font-weight: 600;
  color: var(--text-primary);
  user-select: none;
}
.faq-q:hover { color: var(--neon-gold); }
.faq-arrow {
  width: 20px; height: 20px;
  border: 2px solid var(--neon-purple);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; color: var(--neon-purple);
  transition: var(--transition); flex-shrink: 0;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); background: var(--neon-purple); color: #fff; }
.faq-a {
  display: none; padding: 0 22px 18px;
  color: var(--text-secondary); font-size: 14px; line-height: 1.8;
}
.faq-item.open .faq-a { display: block; }

/* ===== 合作伙伴 ===== */
.partners-grid {
  display: flex; flex-wrap: wrap; gap: 16px;
  justify-content: center; margin-bottom: 48px;
}
.partner-logo {
  background: var(--gradient-card);
  border: 1px solid rgba(155,48,255,0.15);
  border-radius: var(--radius);
  padding: 16px 28px;
  color: var(--text-secondary);
  font-size: 14px; font-weight: 600;
  transition: var(--transition);
}
.partner-logo:hover {
  border-color: var(--neon-gold);
  color: var(--neon-gold);
  transform: translateY(-2px);
}

/* ===== 联系模块 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px; align-items: start;
}
.contact-info h3 {
  font-size: 22px; font-weight: 700;
  color: var(--text-primary); margin-bottom: 20px;
}
.contact-item {
  display: flex; align-items: flex-start; gap: 12px;
  margin-bottom: 16px;
}
.contact-icon {
  width: 36px; height: 36px; flex-shrink: 0;
  background: rgba(155,48,255,0.15);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.contact-text { color: var(--text-secondary); font-size: 14px; }
.contact-text strong { color: var(--text-primary); display: block; margin-bottom: 2px; }
.qr-wrap { display: flex; gap: 24px; margin-top: 24px; }
.qr-item { text-align: center; }
.qr-box {
  width: 100px; height: 100px;
  background: var(--gradient-card);
  border: 2px solid var(--border-glow);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 40px; margin-bottom: 8px;
}
.qr-label { color: var(--text-muted); font-size: 12px; }

/* ===== 页脚 ===== */
.site-footer {
  background: rgba(5,5,10,0.95);
  border-top: 1px solid var(--border-glow);
  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 .logo-text { font-size: 22px; }
.footer-desc {
  color: var(--text-muted); font-size: 13px;
  line-height: 1.8; margin-top: 12px;
}
.footer-col h4 {
  color: var(--text-primary); font-size: 14px;
  font-weight: 700; margin-bottom: 16px;
}
.footer-col a {
  display: block; color: var(--text-muted);
  text-decoration: none; font-size: 13px;
  margin-bottom: 8px; transition: var(--transition);
}
.footer-col a:hover { color: var(--neon-gold); }
.footer-bottom {
  border-top: 1px solid rgba(155,48,255,0.1);
  padding-top: 20px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-copy { color: var(--text-muted); font-size: 12px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a {
  color: var(--text-muted); text-decoration: none;
  font-size: 12px; transition: var(--transition);
}
.footer-links a:hover { color: var(--neon-purple); }
.social-links { display: flex; gap: 10px; }
.social-btn {
  width: 32px; height: 32px;
  background: rgba(155,48,255,0.1);
  border: 1px solid rgba(155,48,255,0.2);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); font-size: 14px;
  text-decoration: none; transition: var(--transition);
}
.social-btn:hover {
  background: var(--neon-purple); color: #fff;
  border-color: var(--neon-purple);
}

/* ===== 通知条 ===== */
.notice-bar {
  background: linear-gradient(90deg, rgba(155,48,255,0.2), rgba(240,192,64,0.1), rgba(155,48,255,0.2));
  border-bottom: 1px solid rgba(155,48,255,0.2);
  padding: 8px 24px;
  display: flex; align-items: center; justify-content: center;
  gap: 12px; font-size: 13px; color: var(--text-secondary);
}
.notice-bar strong { color: var(--neon-gold); }

/* ===== 内页 Banner ===== */
.page-hero {
  background: var(--gradient-hero);
  padding: 80px 24px;
  text-align: center;
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, rgba(155,48,255,0.2) 0%, transparent 70%);
}
.page-hero h1 {
  font-size: clamp(32px, 4vw, 56px);
  font-weight: 900;
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative; z-index: 1;
}
.page-hero p {
  color: var(--text-secondary); font-size: 16px;
  margin-top: 12px; position: relative; z-index: 1;
}
.breadcrumb {
  display: flex; align-items: center; gap: 8px;
  color: var(--text-muted); font-size: 13px;
  margin-top: 16px; justify-content: center;
  position: relative; z-index: 1;
}
.breadcrumb a { color: var(--neon-purple); text-decoration: none; }
.breadcrumb a:hover { color: var(--neon-gold); }

/* ===== 移动端适配 ===== */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .site-nav { display: none; }
  .site-nav.open {
    display: flex; flex-direction: column;
    position: fixed; top: 64px; left: 0; right: 0;
    background: rgba(10,10,15,0.98);
    padding: 20px; gap: 8px;
    border-bottom: 1px solid var(--border-glow);
    z-index: 999;
  }
  .hamburger { display: flex; }
  .hero-stats { gap: 20px; }
  .hero-title { font-size: 36px; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .search-tags { display: none; }
}
@media (max-width: 480px) {
  .section { padding: 48px 0; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { text-align: center; justify-content: center; }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb {
  background: var(--neon-purple);
  border-radius: 3px;
}

/* ===== 动画 ===== */
.fade-up {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== 更新时间 ===== */
.update-time {
  color: var(--text-muted); font-size: 12px;
  display: inline-flex; align-items: center; gap: 4px;
}
.update-time::before { content: '🕐'; font-size: 11px; }