/* ===== 香蕉视频官网 全站样式 ===== */
/* 深空灰渐变背景 + 玻璃态梦幻科技风格 */

:root {
  --bg-primary: #111111;
  --bg-secondary: #1A1A1A;
  --color-cyan: #A0F0FF;
  --color-purple: #D8A0FF;
  --color-warm: #F8F0E8;
  --color-text: #E8E8F0;
  --color-muted: #9090A8;
  --glass-bg: rgba(255,255,255,0.06);
  --glass-border: rgba(160,240,255,0.15);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.4);
  --radius-lg: 20px;
  --radius-md: 12px;
  --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 {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  background: var(--bg-primary);
  color: var(--color-text);
  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;
}

/* ===== 导航 ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(17,17,17,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 68px;
  gap: 32px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  box-shadow: 0 0 16px rgba(160,240,255,0.4);
}

.logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.site-nav a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-cyan);
  background: rgba(160,240,255,0.08);
}

.nav-cta {
  background: linear-gradient(135deg, rgba(160,240,255,0.15), rgba(216,160,255,0.15)) !important;
  border: 1px solid var(--glass-border) !important;
  color: var(--color-warm) !important;
}

.nav-cta:hover {
  background: linear-gradient(135deg, rgba(160,240,255,0.25), rgba(216,160,255,0.25)) !important;
  box-shadow: 0 0 20px rgba(160,240,255,0.2);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* ===== 搜索框 ===== */
.search-bar-wrap {
  background: rgba(26,26,26,0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(160,240,255,0.08);
  padding: 10px 24px;
  position: sticky;
  top: 68px;
  z-index: 999;
}

.search-bar-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  padding: 8px 20px;
  gap: 10px;
  transition: var(--transition);
}

.search-bar-inner:focus-within {
  border-color: var(--color-cyan);
  box-shadow: 0 0 20px rgba(160,240,255,0.15);
}

.search-bar-inner input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: inherit;
}

.search-bar-inner input::placeholder { color: var(--color-muted); }

.search-icon {
  color: var(--color-cyan);
  font-size: 1rem;
  cursor: pointer;
}

/* ===== 主内容区 ===== */
main { position: relative; z-index: 1; padding-top: 68px; }

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

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
}

.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%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(160,240,255,0.1);
  border: 1px solid rgba(160,240,255,0.3);
  border-radius: 50px;
  padding: 6px 18px;
  font-size: 0.85rem;
  color: var(--color-cyan);
  margin-bottom: 28px;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 0%, var(--color-cyan) 40%, var(--color-purple) 80%, var(--color-warm) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: rgba(248,240,232,0.8);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

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

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  color: #111;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(160,240,255,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(160,240,255,0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--glass-bg);
  color: var(--color-warm);
  font-weight: 600;
  font-size: 1rem;
  border-radius: 50px;
  text-decoration: none;
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--color-purple);
  transform: translateY(-2px);
}

/* ===== 通用Section ===== */
.section {
  padding: 96px 24px;
  max-width: 1280px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-cyan);
  margin-bottom: 12px;
  font-weight: 600;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff, var(--color-warm));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== 玻璃卡片 ===== */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: var(--transition);
  overflow: hidden;
}

.glass-card:hover {
  border-color: rgba(160,240,255,0.3);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4), 0 0 32px rgba(160,240,255,0.08);
  transform: translateY(-4px);
}

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

.video-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  border-color: rgba(160,240,255,0.35);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 32px rgba(160,240,255,0.1);
  transform: translateY(-6px);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  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-circle {
  width: 60px; height: 60px;
  background: rgba(160,240,255,0.2);
  border: 2px solid rgba(160,240,255,0.7);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 30px rgba(160,240,255,0.4);
  transition: var(--transition);
}

.play-circle::after {
  content: '';
  width: 0; height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #A0F0FF;
  margin-left: 4px;
}

.video-card:hover .play-circle { transform: scale(1.1); }

.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}

.video-tag {
  position: absolute;
  top: 8px; left: 8px;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  color: #111;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.video-info {
  padding: 16px;
}

.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.5;
  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(--color-muted);
}

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

/* ===== 弹幕区 ===== */
.danmaku-wrap {
  position: relative;
  height: 60px;
  overflow: hidden;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-sm);
  margin: 24px 0;
}

.danmaku-track {
  display: flex;
  gap: 60px;
  position: absolute;
  white-space: nowrap;
  animation: danmaku-scroll 20s linear infinite;
  top: 50%;
  transform: translateY(-50%);
}

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

.danmaku-item {
  font-size: 0.85rem;
  color: var(--color-warm);
  opacity: 0.85;
  padding: 4px 12px;
  background: rgba(255,255,255,0.06);
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.08);
}

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

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

.expert-card:hover {
  border-color: rgba(216,160,255,0.35);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4), 0 0 32px rgba(216,160,255,0.08);
  transform: translateY(-4px);
}

.expert-avatar {
  width: 90px; height: 90px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(160,240,255,0.3);
  margin: 0 auto 16px;
  display: block;
  box-shadow: 0 0 24px rgba(160,240,255,0.2);
}

.expert-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.expert-title {
  font-size: 0.85rem;
  color: var(--color-cyan);
  margin-bottom: 12px;
}

.expert-desc {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ===== 评价卡片 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.review-card:hover {
  border-color: rgba(248,240,232,0.2);
  transform: translateY(-3px);
}

.review-stars {
  color: #FFD700;
  font-size: 1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 18px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #111;
  flex-shrink: 0;
}

.review-info .name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

.review-info .meta {
  font-size: 0.78rem;
  color: var(--color-muted);
}

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover { border-color: rgba(160,240,255,0.25); }

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 0.98rem;
  font-weight: 600;
  text-align: left;
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: inherit;
  transition: var(--transition);
}

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

.faq-icon {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
  transition: var(--transition);
  color: var(--color-cyan);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 24px;
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.8;
}

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

/* ===== 合作伙伴 ===== */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.partner-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-muted);
  transition: var(--transition);
  cursor: default;
}

.partner-item:hover {
  color: var(--color-cyan);
  border-color: rgba(160,240,255,0.3);
}

/* ===== 联系/二维码 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.contact-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}

.qrcode-img {
  width: 140px; height: 140px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 2px solid var(--glass-border);
  margin: 16px auto;
  display: block;
}

/* ===== 页脚 ===== */
.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-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: 1.3rem; }

.footer-brand p {
  color: var(--color-muted);
  font-size: 0.88rem;
  margin-top: 12px;
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.footer-col ul { list-style: none; }

.footer-col ul li { margin-bottom: 10px; }

.footer-col ul li a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
}

.footer-col ul li a:hover { color: var(--color-cyan); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: var(--color-muted);
  font-size: 0.82rem;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 36px; height: 36px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: var(--transition);
}

.footer-social a:hover {
  color: var(--color-cyan);
  border-color: rgba(160,240,255,0.3);
}

/* ===== AI模块 ===== */
.ai-section {
  position: relative;
  overflow: hidden;
  padding: 96px 24px;
}

.ai-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/ai-module-bg.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.25);
}

.ai-content { position: relative; z-index: 1; max-width: 1280px; margin: 0 auto; }

.ai-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.ai-tool-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(160,240,255,0.12);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.ai-tool-card:hover {
  border-color: rgba(160,240,255,0.3);
  background: rgba(160,240,255,0.06);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.ai-tool-icon {
  font-size: 2rem;
  margin-bottom: 16px;
  display: block;
}

.ai-tool-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.ai-tool-desc {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ===== 社区模块 ===== */
.community-section {
  position: relative;
  overflow: hidden;
  padding: 96px 24px;
}

.community-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/community-bg.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.2);
}

.community-content { position: relative; z-index: 1; max-width: 1280px; margin: 0 auto; }

.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.topic-tag {
  background: rgba(216,160,255,0.1);
  border: 1px solid rgba(216,160,255,0.25);
  border-radius: 50px;
  padding: 8px 20px;
  font-size: 0.88rem;
  color: var(--color-purple);
  cursor: pointer;
  transition: var(--transition);
}

.topic-tag:hover {
  background: rgba(216,160,255,0.2);
  border-color: rgba(216,160,255,0.5);
}

/* ===== 统计数字 ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin: 48px 0;
}

.stat-item {
  text-align: center;
  padding: 28px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--color-muted);
}

/* ===== 内页 Banner ===== */
.inner-hero {
  padding: 120px 24px 60px;
  text-align: center;
  background: linear-gradient(135deg, rgba(160,240,255,0.05), rgba(216,160,255,0.05));
  border-bottom: 1px solid var(--glass-border);
}

.inner-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff, var(--color-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.inner-hero p {
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-muted);
  padding: 12px 0;
}

.breadcrumb a { color: var(--color-cyan); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { color: var(--color-muted); }

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

@media (max-width: 768px) {
  .site-nav { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: rgba(17,17,17,0.97); padding: 16px; border-bottom: 1px solid var(--glass-border); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 16px; width: 100%; }
  .nav-toggle { display: block; margin-left: auto; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-actions { flex-direction: column; align-items: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}

@media (max-width: 480px) {
  .section { padding: 60px 16px; }
  .video-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(160,240,255,0.2); }
  50% { box-shadow: 0 0 40px rgba(160,240,255,0.5); }
}

.fade-in { animation: fadeInUp 0.7s ease forwards; }
.glow { animation: glow-pulse 3s ease-in-out infinite; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: rgba(160,240,255,0.25); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(160,240,255,0.5); }