/* =============================================
   每日大赛 - 主样式文件
   官网: iqludao.cn
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --primary: #6B21A8;
  --primary-dark: #4C1D95;
  --primary-light: #9333EA;
  --accent: #D97706;
  --accent-light: #F59E0B;
  --dark: #0F0A1E;
  --dark2: #1A1033;
  --dark3: #241848;
  --text: #E2D9F3;
  --text-muted: #A78BCA;
  --white: #FFFFFF;
  --card-bg: rgba(36, 24, 72, 0.85);
  --border: rgba(107, 33, 168, 0.3);
  --gradient-main: linear-gradient(135deg, #6B21A8 0%, #D97706 100%);
  --gradient-dark: linear-gradient(180deg, #0F0A1E 0%, #1A1033 100%);
  --shadow: 0 8px 32px rgba(107, 33, 168, 0.25);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- 重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--white); }
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(--dark2); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: var(--gradient-main);
  text-align: center;
  padding: 6px 20px;
  font-size: 13px;
  color: var(--white);
  letter-spacing: 0.5px;
}
.top-bar a { color: var(--white); font-weight: 600; }

/* ---- 导航栏 ---- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 10, 30, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 5%;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: 1400px;
  margin: 0 auto;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.nav-logo img {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: cover;
}
.nav-logo-text {
  display: flex;
  flex-direction: column;
}
.nav-logo-name {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.nav-logo-sub {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  background: rgba(107, 33, 168, 0.25);
  color: var(--white);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-nav-join {
  background: var(--gradient-main);
  color: var(--white) !important;
  padding: 8px 18px !important;
  border-radius: 20px !important;
  font-weight: 600 !important;
  font-size: 13px !important;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- 搜索栏 ---- */
.search-bar-wrap {
  background: var(--dark2);
  border-bottom: 1px solid var(--border);
  padding: 10px 5%;
}
.search-bar-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.search-form {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 24px;
  overflow: hidden;
  flex: 1;
  max-width: 600px;
  transition: var(--transition);
}
.search-form:focus-within {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(107,33,168,0.15);
}
.search-form input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 9px 16px;
  font-size: 14px;
  color: var(--text);
}
.search-form input::placeholder { color: var(--text-muted); }
.search-form button {
  background: var(--gradient-main);
  color: var(--white);
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 0 24px 24px 0;
}
.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.search-tag {
  font-size: 12px;
  color: var(--text-muted);
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { color: var(--accent-light); border-color: var(--accent); }

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 12px 5%;
  max-width: 1400px;
  margin: 0 auto;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent-light); }
.breadcrumb span { color: var(--text-muted); margin: 0 6px; }

/* ---- 容器 ---- */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 5%;
}
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }

/* ---- 区块标题 ---- */
.section-header {
  text-align: center;
  margin-bottom: 50px;
}
.section-label {
  display: inline-block;
  background: rgba(107,33,168,0.2);
  color: var(--accent-light);
  border: 1px solid rgba(217,119,6,0.3);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 800;
  color: var(--white);
  line-height: 1.3;
  margin-bottom: 14px;
}
.section-title span {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--gradient-main);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(107,33,168,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(107,33,168,0.6);
  color: var(--white);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--primary-light);
}
.btn-outline:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}
.btn-accent {
  background: linear-gradient(135deg, #D97706, #F59E0B);
  color: var(--white);
}
.btn-accent:hover { transform: translateY(-2px); color: var(--white); }

/* ---- 英雄区 ---- */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,10,30,0.9) 0%, rgba(107,33,168,0.3) 50%, rgba(15,10,30,0.8) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 5%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(217,119,6,0.15);
  border: 1px solid rgba(217,119,6,0.4);
  color: var(--accent-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--accent-light);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero-title {
  font-size: clamp(32px, 5vw, 58px);
  font-weight: 900;
  line-height: 1.15;
  color: var(--white);
  margin-bottom: 20px;
}
.hero-title .brand {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 17px;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
}
.hero-stat-item { text-align: center; }
.hero-stat-num {
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat-label { font-size: 12px; color: var(--text-muted); }
.hero-visual { position: relative; }
.hero-img-main {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  position: relative;
}
.hero-img-main img { width: 100%; height: 420px; object-fit: cover; }
.hero-img-float {
  position: absolute;
  bottom: -20px;
  left: -20px;
  width: 180px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 3px solid var(--dark2);
}
.hero-img-float img { width: 100%; height: 120px; object-fit: cover; }
.hero-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 70px;
  height: 70px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(255,255,255,0.3);
  cursor: pointer;
  transition: var(--transition);
}
.hero-play-btn:hover { background: var(--primary); transform: translate(-50%, -50%) scale(1.1); }
.hero-play-btn svg { width: 28px; height: 28px; fill: white; margin-left: 4px; }

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--dark3);
}
.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-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-overlay { opacity: 1; }
.video-play-icon {
  width: 56px;
  height: 56px;
  background: rgba(107,33,168,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid rgba(255,255,255,0.5);
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .video-play-icon { transform: scale(1); }
.video-play-icon svg { width: 22px; height: 22px; fill: white; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: white;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: white;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.video-meta-item { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 13px; height: 13px; fill: currentColor; }

/* ---- 特色卡片 ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-main);
  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: var(--primary-light);
}
.feature-icon {
  width: 52px;
  height: 52px;
  background: rgba(107,33,168,0.2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 24px;
}
.feature-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}
.feature-desc { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  margin: 0 auto 16px;
  overflow: hidden;
  border: 3px solid var(--primary);
  box-shadow: 0 0 20px rgba(107,33,168,0.4);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 4px;
}
.expert-role {
  font-size: 13px;
  color: var(--accent-light);
  margin-bottom: 12px;
  font-weight: 600;
}
.expert-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 16px; line-height: 1.6; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.expert-tag {
  font-size: 11px;
  background: rgba(107,33,168,0.2);
  color: var(--primary-light);
  border: 1px solid rgba(107,33,168,0.3);
  padding: 2px 8px;
  border-radius: 10px;
}
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.expert-btn {
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 16px;
  font-weight: 600;
  transition: var(--transition);
}
.expert-btn-primary { background: var(--primary); color: white; }
.expert-btn-primary:hover { background: var(--primary-light); color: white; }
.expert-btn-outline { border: 1px solid var(--border); color: var(--text-muted); }
.expert-btn-outline:hover { border-color: var(--primary-light); color: var(--white); }

/* ---- 评价区 ---- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: var(--accent); }
.review-stars { color: var(--accent-light); font-size: 16px; margin-bottom: 12px; }
.review-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}
.review-author-name { font-size: 14px; font-weight: 600; color: var(--white); }
.review-author-label { font-size: 12px; color: var(--text-muted); }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--primary-light); }
.faq-question {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  gap: 12px;
}
.faq-question:hover { color: var(--accent-light); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(107,33,168,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  font-size: 16px;
  color: var(--primary-light);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: white; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ---- 合作品牌Logo墙 ---- */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-logo {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  text-align: center;
}
.partner-logo:hover { border-color: var(--primary-light); color: var(--white); }

/* ---- 联系我们 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-info-block h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  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;
  font-size: 14px;
}
.contact-icon {
  width: 36px;
  height: 36px;
  background: rgba(107,33,168,0.2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { color: var(--text); font-weight: 500; }
.qr-row { display: flex; gap: 20px; margin-top: 20px; }
.qr-item { text-align: center; }
.qr-item img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  border: 2px solid var(--border);
  margin-bottom: 6px;
}
.qr-item p { font-size: 12px; color: var(--text-muted); }

/* ---- 社交分享 ---- */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--border);
  color: var(--text);
}
.share-btn:hover { transform: translateY(-2px); color: var(--white); }
.share-wechat:hover { background: #07C160; border-color: #07C160; }
.share-weibo:hover { background: #E6162D; border-color: #E6162D; }
.share-douyin:hover { background: #010101; border-color: #555; }
.share-bilibili:hover { background: #00A1D6; border-color: #00A1D6; }

/* ---- 页脚 ---- */
.footer {
  background: var(--dark2);
  border-top: 1px solid var(--border);
  padding: 60px 5% 30px;
}
.footer-grid {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand {}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-logo img { width: 40px; height: 40px; border-radius: 8px; object-fit: cover; }
.footer-logo-name {
  font-size: 18px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-desc { font-size: 13px; color: var(--text-muted); line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px;
  height: 36px;
  background: rgba(107,33,168,0.2);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}
.footer-social a:hover { background: var(--primary); border-color: var(--primary); }
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: var(--text-muted); }
.footer-col ul li a:hover { color: var(--accent-light); }
.footer-bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: gap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--accent-light); }
.update-time { color: var(--accent-light); font-weight: 600; }

/* ---- 加入社区区块 ---- */
.join-section {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--dark3) 50%, var(--dark2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.join-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(107,33,168,0.15) 0%, transparent 60%);
  animation: rotate 20s linear infinite;
}
@keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.join-section > * { position: relative; z-index: 1; }
.join-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin: 40px 0;
}
.join-step {
  text-align: center;
  padding: 20px;
}
.join-step-num {
  width: 44px;
  height: 44px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: white;
  margin: 0 auto 12px;
}
.join-step-title { font-size: 15px; font-weight: 700; color: var(--white); margin-bottom: 6px; }
.join-step-desc { font-size: 13px; color: var(--text-muted); }

/* ---- 统计数字区 ---- */
.stats-bar {
  background: var(--dark2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 40px 5%;
}
.stats-grid {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item {}
.stat-num {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* ---- 图片展示 ---- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3/4;
  position: relative;
  cursor: pointer;
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.gallery-item:hover img { transform: scale(1.08); }
.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15,10,30,0.8) 0%, transparent 50%);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-overlay p { font-size: 13px; color: white; font-weight: 600; }

/* ---- 标签页 ---- */
.tabs { display: flex; gap: 8px; margin-bottom: 30px; flex-wrap: wrap; }
.tab-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

/* ---- 内页横幅 ---- */
.page-banner {
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%);
  border-bottom: 1px solid var(--border);
  padding: 60px 5%;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(107,33,168,0.2) 0%, transparent 70%);
}
.page-banner > * { position: relative; z-index: 1; }
.page-banner h1 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 12px;
}
.page-banner p { font-size: 16px; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

/* ---- 移动端菜单 ---- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15,10,30,0.98);
  z-index: 9999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  padding: 10px 30px;
}
.mobile-menu a:hover { color: var(--accent-light); }
.mobile-close {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 28px;
  color: var(--text-muted);
  cursor: pointer;
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-actions .btn-nav-join { display: none; }
  .hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 50px 0; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .join-section { padding: 40px 20px; }
  .search-tags { display: none; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 28px; }
  .hero-actions { flex-direction: column; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
}

/* ---- 动画 ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ---- 懒加载占位 ---- */
img[data-src] { background: var(--dark3); min-height: 100px; }

/* ---- 高亮文字 ---- */
.highlight { color: var(--accent-light); font-weight: 700; }
.text-gradient {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- 分隔线 ---- */
.divider {
  height: 1px;
  background: var(--border);
  margin: 40px 0;
}

/* ---- 标签 ---- */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}
.tag-purple { background: rgba(107,33,168,0.2); color: var(--primary-light); border: 1px solid rgba(107,33,168,0.3); }
.tag-gold { background: rgba(217,119,6,0.2); color: var(--accent-light); border: 1px solid rgba(217,119,6,0.3); }
.tag-blue { background: rgba(29,78,216,0.2); color: #60A5FA; border: 1px solid rgba(29,78,216,0.3); }
.tag-green { background: rgba(5,150,105,0.2); color: #34D399; border: 1px solid rgba(5,150,105,0.3); }

/* ---- 加载更多 ---- */
.load-more-wrap { text-align: center; margin-top: 40px; }

/* ---- 视频播放器模态 ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 10000;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  position: relative;
  width: 90%;
  max-width: 900px;
  background: var(--dark2);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 1;
  width: 32px;
  height: 32px;
  background: rgba(0,0,0,0.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: white;
  font-size: 18px;
}
.video-modal video, .video-modal iframe {
  width: 100%;
  aspect-ratio: 16/9;
  display: block;
}