/**
 * 麻豆 - 主样式文件
 * 品牌: 麻豆 | 域名: cuis6i.cn
 * 原创设计，版权所有 © 2025 麻豆传媒有限公司
 */

/* ===== CSS变量 ===== */
:root {
  --primary: #E8336D;
  --primary-dark: #C0225A;
  --primary-light: #FF6B9D;
  --primary-gradient: linear-gradient(135deg, #E8336D 0%, #FF6B6B 100%);
  --secondary: #7B2FBE;
  --accent: #FF9A3C;
  --bg-dark: #0D0D1A;
  --bg-card: #161628;
  --bg-section: #111122;
  --bg-light: #F8F4FF;
  --text-main: #FFFFFF;
  --text-muted: #A0A0C0;
  --text-dark: #1A1A2E;
  --border: rgba(232,51,109,0.2);
  --border-light: rgba(255,255,255,0.08);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 40px rgba(232,51,109,0.25);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --transition-fast: all 0.18s ease;
  --font-main: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

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

/* ===== 通用工具类 ===== */
.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; }
.section-title {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}
.section-title span { color: var(--primary); }
.section-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 36px;
}
.section-header { margin-bottom: 36px; }
.section-header .more-link {
  font-size: 14px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition-fast);
}
.section-header .more-link:hover { gap: 8px; }
.section-header-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(232,51,109,0.15);
  color: var(--primary);
  border: 1px solid rgba(232,51,109,0.3);
  margin-bottom: 10px;
}
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  background: rgba(232,51,109,0.12);
  color: var(--primary-light);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-xl);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(232,51,109,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,51,109,0.5); }
.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}
.btn-outline:hover { background: rgba(232,51,109,0.1); }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.section-py { padding: 80px 0; }
.section-py-sm { padding: 56px 0; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--primary-gradient);
  padding: 8px 0;
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.top-bar-marquee {
  display: flex;
  gap: 40px;
  animation: marquee 30s linear infinite;
  white-space: nowrap;
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.top-bar-close {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(255,255,255,0.8);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
}

/* ===== 导航栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,13,26,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}
.site-header.scrolled {
  box-shadow: 0 4px 30px rgba(0,0,0,0.4);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img.logo-img {
  height: 40px;
  width: auto;
}
.site-logo .logo-text {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}
.site-logo .logo-text span { color: var(--primary); }
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.main-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition-fast);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-main);
  background: rgba(255,255,255,0.06);
}
.main-nav a.active { color: var(--primary); }
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.header-actions .btn-join {
  background: var(--primary-gradient);
  color: #fff;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}
.header-actions .btn-join:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(232,51,109,0.4); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ===== 搜索栏 ===== */
.search-bar-wrap {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border-light);
  padding: 12px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 700px;
  margin: 0 auto;
}
.search-input-wrap {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}
.search-input-wrap svg {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
}
.search-input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-light);
  border-radius: 24px;
  color: var(--text-main);
  font-size: 14px;
  outline: none;
  transition: var(--transition-fast);
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  border-color: var(--primary);
  background: rgba(232,51,109,0.05);
}
.search-btn {
  padding: 10px 24px;
  background: var(--primary-gradient);
  color: #fff;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  flex-shrink: 0;
}
.search-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(232,51,109,0.4); }
.search-hot-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  max-width: 700px;
  margin: 8px auto 0;
  font-size: 12px;
  color: var(--text-muted);
}
.search-hot-tags span { color: var(--text-muted); }
.search-hot-tags a {
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255,255,255,0.04);
  transition: var(--transition-fast);
}
.search-hot-tags a:hover { color: var(--primary); background: rgba(232,51,109,0.08); }

/* ===== 移动端导航 ===== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13,13,26,0.98);
  z-index: 2000;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  transition: var(--transition-fast);
}
.mobile-nav a:hover { color: var(--primary); }
.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 28px;
  color: var(--text-muted);
  cursor: pointer;
}

/* ===== Hero区域 ===== */
.hero-section {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/hero-banner.jpg') center/cover no-repeat;
  opacity: 0.4;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,13,26,0.9) 0%, rgba(13,13,26,0.6) 60%, rgba(13,13,26,0.3) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
}
.hero-content h1 {
  font-size: clamp(32px, 5vw, 60px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-content h1 .brand { color: var(--primary); }
.hero-content .hero-desc {
  font-size: clamp(15px, 2vw, 18px);
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  display: block;
}
.hero-stat .label {
  font-size: 13px;
  color: var(--text-muted);
}
.hero-floating {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  z-index: 2;
}
.hero-float-card {
  background: rgba(22,22,40,0.85);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px;
  backdrop-filter: blur(10px);
  text-align: center;
  min-width: 120px;
}
.hero-float-card .icon { font-size: 28px; margin-bottom: 6px; }
.hero-float-card .title { font-size: 13px; color: var(--text-muted); }
.hero-float-card .val { font-size: 18px; font-weight: 700; color: var(--primary); }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232,51,109,0.3);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-section);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s 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;
  opacity: 0;
  transition: var(--transition);
  background: rgba(0,0,0,0.4);
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn svg {
  width: 52px;
  height: 52px;
  fill: #fff;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.5));
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  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%;
  background: var(--primary-gradient);
  flex-shrink: 0;
}
.video-stats { display: flex; gap: 10px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ===== 分类标签栏 ===== */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.category-tab {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: var(--transition-fast);
}
.category-tab:hover, .category-tab.active {
  background: rgba(232,51,109,0.15);
  color: var(--primary);
  border-color: rgba(232,51,109,0.3);
}

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  border: 1px solid var(--border-light);
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232,51,109,0.3);
}
.expert-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  margin: 0 auto 16px;
  overflow: hidden;
  border: 3px solid var(--primary);
  padding: 2px;
}
.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}
.expert-name { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.expert-role {
  font-size: 13px;
  color: var(--primary);
  margin-bottom: 10px;
}
.expert-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}
.expert-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 16px;
}
.expert-award {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(255,154,60,0.12);
  color: var(--accent);
  border: 1px solid rgba(255,154,60,0.2);
}
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.expert-social { display: flex; gap: 8px; justify-content: center; margin-top: 10px; }
.expert-social a {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition-fast);
}
.expert-social a:hover { background: rgba(232,51,109,0.2); color: var(--primary); }

/* ===== 合作品牌 ===== */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: center;
}
.partner-item {
  padding: 14px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: var(--transition);
  opacity: 0.7;
}
.partner-item:hover {
  opacity: 1;
  border-color: var(--primary);
  transform: translateY(-2px);
}
.partner-item img { height: 36px; width: auto; }

/* ===== 加入指南 ===== */
.join-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.join-steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
  opacity: 0.3;
}
.join-step {
  text-align: center;
  position: relative;
}
.join-step-num {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  color: #fff;
  margin: 0 auto 16px;
  box-shadow: 0 4px 20px rgba(232,51,109,0.4);
}
.join-step h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.join-step p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,51,109,0.3); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  gap: 16px;
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(232,51,109,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
  font-size: 18px;
  transition: var(--transition-fast);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-answer {
  display: none;
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { display: block; }

/* ===== 评论 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(232,51,109,0.25); transform: translateY(-2px); }
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user-name { font-size: 15px; font-weight: 600; margin-bottom: 2px; }
.review-date { font-size: 12px; color: var(--text-muted); }
.review-stars { color: #FFD700; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
.review-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px; }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 20px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}
.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(232,51,109,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.contact-value { font-size: 15px; font-weight: 600; }
.qr-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.qr-item {
  text-align: center;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid var(--border-light);
}
.qr-item img { width: 100%; max-width: 120px; margin: 0 auto 8px; }
.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: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  transition: var(--transition-fast);
  cursor: pointer;
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(232,51,109,0.06); }

/* ===== 页脚 ===== */
.site-footer {
  background: #080812;
  border-top: 1px solid var(--border-light);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border-light);
}
.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-brand .footer-logo img { height: 36px; }
.footer-brand .footer-logo span { font-size: 18px; font-weight: 800; }
.footer-brand .footer-logo span em { color: var(--primary); font-style: normal; }
.footer-desc { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--text-muted);
  transition: var(--transition-fast);
}
.footer-social a:hover { background: var(--primary); color: #fff; }
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-muted);
  transition: var(--transition-fast);
}
.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 13px; color: var(--text-muted); }
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }
.footer-links { display: flex; gap: 20px; }

/* ===== 内容区块背景 ===== */
.bg-section { background: var(--bg-section); }
.bg-card-section { background: var(--bg-card); }
.divider {
  height: 1px;
  background: var(--border-light);
  margin: 0;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  padding: 16px 0;
}
.breadcrumb a { color: var(--text-muted); transition: var(--transition-fast); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: rgba(255,255,255,0.2); }
.breadcrumb .current { color: var(--text-main); }

/* ===== 内页Hero ===== */
.page-hero {
  background: linear-gradient(135deg, var(--bg-section) 0%, var(--bg-dark) 100%);
  padding: 60px 0 48px;
  border-bottom: 1px solid var(--border-light);
}
.page-hero h1 {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  margin-bottom: 12px;
}
.page-hero p { font-size: 16px; color: var(--text-muted); }

/* ===== 加载动画 ===== */
.skeleton {
  background: linear-gradient(90deg, rgba(255,255,255,0.04) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.04) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== 视频模态框 ===== */
.video-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  backdrop-filter: blur(8px);
}
.video-modal.show { opacity: 1; pointer-events: all; }
.video-modal-inner {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 800px;
  aspect-ratio: 16/9;
  position: relative;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform 0.3s;
}
.video-modal.show .video-modal-inner { transform: scale(1); }
.video-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  background: rgba(0,0,0,0.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition-fast);
}
.video-modal-close:hover { background: var(--primary); }
.video-modal-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-muted);
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-section) 100%);
}
.video-modal-placeholder .play-icon {
  width: 80px;
  height: 80px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: #fff;
}

/* ===== AI专区 ===== */
.ai-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.ai-feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition);
}
.ai-feature-card:hover::before { opacity: 1; }
.ai-feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.ai-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(232,51,109,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}
.ai-feature-card h4 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.ai-feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== 统计数字 ===== */
.stats-bar {
  background: var(--primary-gradient);
  padding: 40px 0;
}
.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item .num {
  font-size: 36px;
  font-weight: 900;
  color: #fff;
  display: block;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-item .label { font-size: 14px; color: rgba(255,255,255,0.8); }

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-floating { display: none; }
}
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
  .join-steps::before { display: none; }
  .ai-features { grid-template-columns: repeat(2, 1fr); }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .header-actions .btn-join { display: none; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-section { min-height: 420px; }
  .hero-content h1 { font-size: 28px; }
  .section-py { padding: 56px 0; }
  .join-steps { grid-template-columns: 1fr; }
  .ai-features { grid-template-columns: 1fr; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .qr-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-stats { gap: 20px; }
  .stats-inner { grid-template-columns: 1fr; }
}