/* 糖心视频 - 主样式文件 | jauond.cn */
/* 原创设计，版权所有 © 2026 糖心 */

/* ===== CSS变量 ===== */
:root {
  --primary: #0a1628;
  --secondary: #1a3a6b;
  --accent: #c8a84b;
  --accent-light: #e8c86a;
  --coral: #e85d4a;
  --teal: #1eb8a0;
  --purple: #7c4dff;
  --bg-dark: #050d1a;
  --bg-card: #0d1f3c;
  --bg-card2: #0f2545;
  --text-primary: #f0f4ff;
  --text-secondary: #a8b8d0;
  --text-muted: #6a7f9a;
  --border: rgba(200, 168, 75, 0.2);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: all 0.3s ease;
}

/* ===== 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 SC', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

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

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: linear-gradient(90deg, var(--secondary), var(--primary));
  padding: 6px 0;
  font-size: 12px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}
.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-bar-links a {
  color: var(--text-secondary);
  margin-left: 16px;
  font-size: 12px;
}
.top-bar-links a:hover { color: var(--accent); }

/* ===== 容器 ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.container-sm { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ===== 导航栏 ===== */
.site-header {
  background: rgba(5, 13, 26, 0.95);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.nav-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav-logo img {
  height: 48px;
  width: auto;
  object-fit: contain;
}
.nav-logo-text {
  display: flex;
  flex-direction: column;
}
.nav-logo-text .brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
  line-height: 1.2;
}
.nav-logo-text .brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: rgba(200, 168, 75, 0.1);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-nav-login {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 13px;
  transition: var(--transition);
}
.btn-nav-login:hover {
  background: var(--accent);
  color: var(--primary);
}
.btn-nav-join {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-nav-join:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(200, 168, 75, 0.4);
}

/* ===== 搜索框 ===== */
.search-bar-wrap {
  background: linear-gradient(180deg, rgba(10,22,40,0.9) 0%, rgba(5,13,26,0.95) 100%);
  padding: 12px 0;
  border-bottom: 1px solid rgba(200,168,75,0.1);
}
.search-bar-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.search-form {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(200,168,75,0.25);
  border-radius: 30px;
  padding: 0 6px 0 18px;
  width: 100%;
  max-width: 600px;
  transition: var(--transition);
}
.search-form:focus-within {
  border-color: var(--accent);
  background: rgba(255,255,255,0.09);
  box-shadow: 0 0 0 3px rgba(200,168,75,0.1);
}
.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 14px;
  padding: 10px 0;
  font-family: inherit;
}
.search-input::placeholder { color: var(--text-muted); }
.search-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
  border: none;
  border-radius: 24px;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.search-btn:hover { transform: scale(1.03); }
.search-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.search-tag {
  background: rgba(200,168,75,0.1);
  border: 1px solid rgba(200,168,75,0.2);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 12px;
}
.search-tag:hover {
  background: rgba(200,168,75,0.2);
}

/* ===== 汉堡菜单 ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: var(--transition);
}

/* ===== Hero轮播 ===== */
.hero-slider {
  position: relative;
  overflow: hidden;
  height: 520px;
}
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}
.hero-slide.active { opacity: 1; }
.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(5,13,26,0.85) 0%, rgba(5,13,26,0.4) 60%, transparent 100%);
}
.hero-content {
  position: absolute;
  bottom: 60px;
  left: 60px;
  max-width: 600px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(200,168,75,0.15);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12px;
  margin-bottom: 14px;
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero-title {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 14px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}
.hero-title span { color: var(--accent); }
.hero-desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}
.hero-btns { display: flex; gap: 12px; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200,168,75,0.4);
  color: var(--primary);
}
.btn-secondary {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 15px;
  border: 1px solid rgba(255,255,255,0.2);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.15);
  color: var(--text-primary);
}
.hero-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}
.hero-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}
.hero-dot.active {
  background: var(--accent);
  width: 24px;
  border-radius: 4px;
}
.hero-stats {
  position: absolute;
  right: 40px;
  bottom: 40px;
  display: flex;
  gap: 20px;
}
.hero-stat {
  text-align: center;
  background: rgba(5,13,26,0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 20px;
}
.hero-stat-num {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.hero-stat-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== 区块标题 ===== */
.section { padding: 60px 0; }
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 36px;
}
.section-title-wrap {}
.section-label {
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-label::before {
  content: '';
  width: 20px;
  height: 2px;
  background: var(--accent);
}
.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}
.section-title span { color: var(--accent); }
.section-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 8px;
}
.section-more {
  color: var(--accent);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}
.section-more:hover { color: var(--accent-light); }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.video-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(200,168,75,0.4);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-card2);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 52px;
  height: 52px;
  background: rgba(200,168,75,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border-left: 18px solid var(--primary);
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--coral);
  color: #fff;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag.hot { background: var(--coral); }
.video-tag.new { background: var(--teal); }
.video-tag.award { background: var(--accent); color: var(--primary); }
.video-info { padding: 14px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}
.video-author {
  display: flex;
  align-items: center;
  gap: 6px;
}
.video-author-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--secondary);
}
.video-stats {
  display: flex;
  gap: 10px;
}
.video-stat-item {
  display: flex;
  align-items: center;
  gap: 3px;
}

/* ===== 功能模块卡片 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(200,168,75,0.3);
}
.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 26px;
}
.feature-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.feature-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== 专家展示 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(200,168,75,0.4);
}
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 3px solid var(--accent);
}
.expert-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.expert-role {
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 10px;
}
.expert-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}
.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 14px;
}
.expert-tag {
  background: rgba(200,168,75,0.1);
  border: 1px solid rgba(200,168,75,0.2);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
}
.expert-btns {
  display: flex;
  gap: 8px;
  justify-content: center;
}
.btn-sm {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
}
.btn-sm-outline {
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn-sm-outline:hover {
  background: rgba(200,168,75,0.1);
}

/* ===== 评价区 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}
.review-card:hover {
  transform: translateY(-2px);
  border-color: rgba(200,168,75,0.3);
}
.review-stars {
  color: var(--accent);
  font-size: 14px;
  margin-bottom: 10px;
}
.review-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 14px;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 10px;
}
.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}
.review-user-info .name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}
.review-user-info .date {
  font-size: 11px;
  color: var(--text-muted);
}

/* ===== FAQ ===== */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(200,168,75,0.3); }
.faq-question {
  padding: 18px 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-question::after {
  content: '+';
  font-size: 20px;
  color: var(--accent);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.faq-item.open .faq-answer { display: block; }

/* ===== 合作品牌 ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  align-items: center;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
  transition: var(--transition);
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
}
.partner-item:hover {
  border-color: rgba(200,168,75,0.4);
  color: var(--accent);
  background: rgba(200,168,75,0.05);
}

/* ===== 联系区域 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-info-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(200,168,75,0.1);
  border: 1px solid rgba(200,168,75,0.2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.contact-value {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
}
.qrcode-row {
  display: flex;
  gap: 24px;
  margin-top: 20px;
}
.qrcode-item {
  text-align: center;
}
.qrcode-item img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  border: 2px solid var(--border);
  margin-bottom: 6px;
}
.qrcode-item p {
  font-size: 11px;
  color: var(--text-muted);
}

/* ===== 社区入口 ===== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.community-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}
.community-card:hover {
  transform: translateY(-3px);
  border-color: rgba(200,168,75,0.4);
}
.community-icon {
  font-size: 40px;
  margin-bottom: 12px;
}
.community-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.community-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* ===== 分享按钮 ===== */
.share-bar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.share-label {
  font-size: 14px;
  color: var(--text-muted);
  white-space: nowrap;
}
.share-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.share-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.share-btn:hover { transform: translateY(-1px); opacity: 0.9; }
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-qq { background: #12b7f5; color: #fff; }

/* ===== 页脚 ===== */
.site-footer {
  background: linear-gradient(180deg, var(--primary) 0%, #020810 100%);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}
.footer-brand {}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-logo img { height: 40px; width: auto; }
.footer-logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}
.footer-about {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.social-link {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}
.social-link:hover {
  background: rgba(200,168,75,0.15);
  border-color: var(--accent);
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copyright {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-copyright a { color: var(--accent); }
.footer-icp {
  font-size: 12px;
  color: var(--text-muted);
}
.footer-update {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 14px 0;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--accent); }

/* ===== 页面头部 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  padding: 50px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(200,168,75,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.page-hero-title {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.page-hero-title span { color: var(--accent); }
.page-hero-desc {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ===== 标签筛选 ===== */
.filter-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.filter-tab {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: transparent;
}
.filter-tab.active,
.filter-tab:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
  border-color: transparent;
}

/* ===== 加入社区步骤 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.steps-grid::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  z-index: 0;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
  z-index: 1;
  transition: var(--transition);
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.step-num {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  color: var(--primary);
  margin: 0 auto 14px;
}
.step-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.step-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== AI功能区 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(124,77,255,0.08) 100%);
  border: 1px solid rgba(124,77,255,0.2);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}
.ai-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(124,77,255,0.15);
  border-color: rgba(124,77,255,0.4);
}
.ai-icon {
  font-size: 36px;
  margin-bottom: 14px;
}
.ai-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.ai-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}
.ai-features {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.ai-feature-tag {
  background: rgba(124,77,255,0.15);
  border: 1px solid rgba(124,77,255,0.3);
  color: #b39dff;
  padding: 3px 10px;
  border-radius: 10px;
  font-size: 11px;
}

/* ===== 直播区 ===== */
.live-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.live-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.live-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.live-thumb {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
}
.live-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.live-card:hover .live-thumb img { transform: scale(1.05); }
.live-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--coral);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.live-badge::before {
  content: '';
  width: 5px;
  height: 5px;
  background: #fff;
  border-radius: 50%;
  animation: pulse 1s infinite;
}
.live-viewers {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
}
.live-info { padding: 12px; }
.live-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.live-category {
  font-size: 11px;
  color: var(--text-muted);
}

/* ===== 统计数字 ===== */
.stats-section {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
  padding: 50px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item {}
.stat-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== 通用工具类 ===== */
.text-center { text-align: center; }
.text-accent { color: var(--accent); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.mb-24 { margin-bottom: 24px; }
.bg-section { background: rgba(13,31,60,0.5); }
.divider {
  height: 1px;
  background: var(--border);
  margin: 40px 0;
}
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
}
.tag-accent { background: rgba(200,168,75,0.15); color: var(--accent); border: 1px solid rgba(200,168,75,0.3); }
.tag-coral { background: rgba(232,93,74,0.15); color: var(--coral); border: 1px solid rgba(232,93,74,0.3); }
.tag-teal { background: rgba(30,184,160,0.15); color: var(--teal); border: 1px solid rgba(30,184,160,0.3); }
.tag-purple { background: rgba(124,77,255,0.15); color: #b39dff; border: 1px solid rgba(124,77,255,0.3); }

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 992px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .live-grid { grid-template-columns: repeat(3, 1fr); }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid::before { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(4, 1fr); }
  .hero-stats { display: none; }
  .hero-title { font-size: 32px; }
  .hero-content { left: 30px; bottom: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-dark);
    z-index: 999;
    align-items: center;
    justify-content: center;
    gap: 20px;
  }
  .nav-links.mobile-open a { font-size: 20px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .live-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .hero-slider { height: 320px; }
  .hero-title { font-size: 24px; }
  .hero-desc { font-size: 13px; }
  .hero-content { left: 20px; bottom: 20px; max-width: 80%; }
  .hero-btns { flex-direction: column; gap: 8px; }
  .section { padding: 40px 0; }
  .section-title { font-size: 22px; }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .steps-grid { grid-template-columns: 1fr 1fr; }
  .search-bar-inner { flex-direction: column; }
  .search-tags { justify-content: center; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .live-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-slider { height: 260px; }
  .hero-title { font-size: 20px; }
  .btn-primary, .btn-secondary { padding: 10px 20px; font-size: 13px; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }

/* ===== 懒加载占位 ===== */
img[data-src] { background: var(--bg-card2); min-height: 100px; }

/* ===== 移动端菜单关闭按钮 ===== */
.mobile-close {
  display: none;
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  background: var(--accent);
  color: var(--primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 20px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: none;
}
.nav-links.mobile-open ~ .mobile-close { display: flex; }


/* ===== 社区美图网格 ===== */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 200px;
  gap: 12px;
}
.photo-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  cursor: pointer;
}
.photo-item.photo-tall { grid-row: span 2; }
.photo-item.photo-wide { grid-column: span 2; }
.photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.photo-item:hover img { transform: scale(1.06); }
.photo-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  padding: 16px;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.photo-item:hover .photo-overlay { opacity: 1; }
.photo-like { color: #fff; font-size: 13px; }

/* ===== 关于我们 ===== */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}
.about-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.about-icon {
  font-size: 40px;
  margin-bottom: 16px;
}
.about-card h3 {
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 12px;
}
.about-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--teal));
}
.timeline-item {
  position: relative;
  margin-bottom: 36px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-dark);
}
.timeline-year {
  min-width: 60px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}
.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  flex: 1;
}
.timeline-content h3 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.timeline-content p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== 联系表单 ===== */
.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 13px; color: var(--text-secondary); }
.form-input {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.3s ease;
  width: 100%;
}
.form-input:focus {
  outline: none;
  border-color: var(--accent);
}
.form-textarea { resize: vertical; min-height: 120px; }

/* ===== 标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.tag-accent { background: rgba(200,168,75,0.2); color: var(--accent); border: 1px solid rgba(200,168,75,0.3); }
.tag-coral { background: rgba(232,93,74,0.2); color: var(--coral); border: 1px solid rgba(232,93,74,0.3); }
.tag-teal { background: rgba(30,184,160,0.2); color: var(--teal); border: 1px solid rgba(30,184,160,0.3); }

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
  .photo-item.photo-wide { grid-column: span 1; }
  .photo-item.photo-tall { grid-row: span 1; }
  .timeline { padding-left: 24px; }
}
@media (max-width: 480px) {
  .photo-grid { grid-template-columns: 1fr; }
}