/* ============================================
   麻豆视频 - 原创CSS样式表
   品牌：麻豆视频 | 域名：hrssf.cn
   配色方案：活力橙 + 深邃蓝黑 + 电竞红
   ============================================ */

/* CSS变量定义 */
:root {
  --primary: #FF6B35;
  --primary-dark: #E55A2B;
  --secondary: #1A1A2E;
  --accent: #E94560;
  --bg-dark: #0F0F23;
  --bg-card: #16213E;
  --bg-card-hover: #1C2A4A;
  --text-main: #EAEAEA;
  --text-muted: #A0A0B8;
  --text-bright: #FFFFFF;
  --gradient-primary: linear-gradient(135deg, #FF6B35, #E94560);
  --gradient-dark: linear-gradient(180deg, #0F0F23, #1A1A2E);
  --gradient-card: linear-gradient(145deg, #16213E, #1A1A2E);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(255,107,53,0.3);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
}

/* 重置样式 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ============ 头部导航 ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 15, 35, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,107,53,0.2);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(15, 15, 35, 0.98);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  height: 45px;
  width: auto;
}

.logo-text {
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-nav a {
  color: var(--text-main);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: rgba(255,107,53,0.1);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* 搜索框 */
.search-bar {
  background: var(--secondary);
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,107,53,0.1);
  margin-top: 70px;
}

.search-bar .container {
  display: flex;
  justify-content: center;
}

.search-form {
  display: flex;
  max-width: 600px;
  width: 100%;
  position: relative;
}

.search-input {
  flex: 1;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid rgba(255,107,53,0.3);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(255,107,53,0.2);
}

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

.search-btn {
  padding: 10px 24px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  color: var(--text-bright);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.search-btn:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

/* ============ Banner区域 ============ */
.hero-banner {
  position: relative;
  width: 100%;
  min-height: 520px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-banner .banner-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.hero-banner .banner-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(15,15,35,0.6) 0%, rgba(15,15,35,0.85) 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 60px 20px;
  max-width: 800px;
}

.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
}

.hero-content .hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 30px;
  line-height: 1.8;
}

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

.btn-primary {
  display: inline-block;
  padding: 12px 32px;
  background: var(--gradient-primary);
  color: var(--text-bright);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(255,107,53,0.5);
  color: var(--text-bright);
}

.btn-outline {
  display: inline-block;
  padding: 12px 32px;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--text-bright);
  transform: translateY(-2px);
}

/* ============ 通用区块标题 ============ */
.section {
  padding: 70px 0;
}

.section-alt {
  background: var(--secondary);
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-title p {
  color: var(--text-muted);
  font-size: 1rem;
  margin-top: 16px;
}

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

.video-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid rgba(255,107,53,0.1);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(255,107,53,0.3);
}

.video-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  background: var(--bg-card);
}

.video-thumb img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.video-card:hover .video-thumb img {
  transform: scale(1.05);
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(255,107,53,0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  z-index: 5;
}

.video-play-btn::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}

.video-card:hover .video-play-btn {
  opacity: 1;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: var(--text-bright);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  z-index: 5;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-bright);
  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: 16px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

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

.video-tags {
  display: flex;
  gap: 6px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.video-tag {
  padding: 2px 10px;
  background: rgba(255,107,53,0.15);
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.75rem;
}

/* ============ 专家展示 ============ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.expert-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 30px 20px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid rgba(255,107,53,0.1);
}

.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(255,107,53,0.3);
}

.expert-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--primary);
}

.expert-card h3 {
  font-size: 1.1rem;
  color: var(--text-bright);
  margin-bottom: 4px;
}

.expert-role {
  color: var(--primary);
  font-size: 0.88rem;
  margin-bottom: 12px;
}

.expert-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.expert-btns {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.expert-btns a {
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
}

/* ============ AI赋能模块 ============ */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.ai-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid rgba(233,69,96,0.15);
}

.ai-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(233,69,96,0.3);
  border-color: rgba(233,69,96,0.4);
}

.ai-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.ai-card-body {
  padding: 20px;
}

.ai-card-body h3 {
  font-size: 1.1rem;
  color: var(--text-bright);
  margin-bottom: 10px;
}

.ai-card-body p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ============ 社区模块 ============ */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.community-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid rgba(255,107,53,0.1);
}

.community-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.community-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.community-card h3 {
  font-size: 1.05rem;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.community-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.6;
}

.community-stats {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--primary);
}

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

.faq-item {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  border: 1px solid rgba(255,107,53,0.1);
  overflow: hidden;
}

.faq-question {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--text-bright);
  transition: var(--transition);
}

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

.faq-question .faq-toggle {
  font-size: 1.2rem;
  transition: var(--transition);
  color: var(--primary);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 0.92rem;
}

.faq-item.active .faq-answer {
  padding: 0 24px 18px;
  max-height: 300px;
}

/* ============ 用户评论 ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid rgba(255,107,53,0.1);
  transition: var(--transition);
}

.review-card:hover {
  border-color: rgba(255,107,53,0.3);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-bright);
  font-weight: 700;
  font-size: 1.1rem;
}

.review-name {
  font-weight: 600;
  color: var(--text-bright);
  font-size: 0.95rem;
}

.review-date {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.review-stars {
  color: var(--primary);
  margin-bottom: 10px;
  font-size: 0.9rem;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ============ 合作品牌 ============ */
.brand-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  align-items: center;
}

.brand-wall-item {
  padding: 16px 28px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid rgba(255,107,53,0.1);
  transition: var(--transition);
}

.brand-wall-item:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ============ How-To指南 ============ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.howto-step {
  text-align: center;
  padding: 24px;
}

.step-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-bright);
  font-weight: 700;
  font-size: 1.3rem;
  margin: 0 auto 16px;
}

.howto-step h3 {
  color: var(--text-bright);
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.howto-step p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ============ 联系我们 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.contact-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid rgba(255,107,53,0.1);
}

.contact-card h3 {
  color: var(--text-bright);
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,107,53,0.2);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.contact-item strong {
  color: var(--text-main);
  min-width: 70px;
}

/* ============ 社交分享 ============ */
.share-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.share-btn {
  padding: 10px 20px;
  border-radius: var(--radius-lg);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-bright);
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.2);
  background: var(--bg-card);
}

.share-btn:hover {
  transform: translateY(-2px);
  color: var(--text-bright);
}

.share-btn.wechat:hover { background: #07C160; border-color: #07C160; }
.share-btn.weibo:hover { background: #E6162D; border-color: #E6162D; }
.share-btn.douyin:hover { background: #161823; border-color: #FE2C55; }
.share-btn.bilibili:hover { background: #00A1D6; border-color: #00A1D6; }

/* ============ 页脚 ============ */
.site-footer {
  background: var(--secondary);
  border-top: 1px solid rgba(255,107,53,0.2);
  padding: 50px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--text-bright);
  font-size: 1.05rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}

.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 8px;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-col p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.footer-qr {
  display: flex;
  gap: 16px;
}

.footer-qr-item {
  text-align: center;
}

.footer-qr-item img {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
}

.footer-qr-item span {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,107,53,0.1);
  color: var(--text-muted);
  font-size: 0.84rem;
}

.footer-bottom a {
  color: var(--primary);
}

/* ============ 面包屑导航 ============ */
.breadcrumb {
  padding: 14px 0;
  margin-top: 70px;
  background: var(--secondary);
  border-bottom: 1px solid rgba(255,107,53,0.1);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.breadcrumb-list a {
  color: var(--text-muted);
}

.breadcrumb-list a:hover {
  color: var(--primary);
}

.breadcrumb-list .separator {
  color: var(--text-muted);
}

.breadcrumb-list .current {
  color: var(--primary);
}

/* ============ 内页布局 ============ */
.page-header {
  padding: 50px 0 30px;
  text-align: center;
  background: var(--gradient-dark);
}

.page-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.page-content {
  padding: 50px 0;
}

/* ============ 推荐侧边栏 ============ */
.content-with-sidebar {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 30px;
}

.sidebar {
  position: sticky;
  top: 90px;
  height: fit-content;
}

.sidebar-widget {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
  border: 1px solid rgba(255,107,53,0.1);
}

.sidebar-widget h3 {
  font-size: 1rem;
  color: var(--text-bright);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255,107,53,0.15);
}

.sidebar-link {
  display: block;
  padding: 8px 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: var(--transition);
}

.sidebar-link:hover {
  color: var(--primary);
  padding-left: 6px;
}

/* ============ 回到顶部 ============ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-bright);
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  border: none;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* ============ 响应式设计 ============ */
@media (max-width: 1024px) {
  .content-with-sidebar {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: static;
  }
  .ai-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(15, 15, 35, 0.98);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid rgba(255,107,53,0.2);
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav a {
    width: 100%;
    text-align: center;
    padding: 12px;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-content h1 {
    font-size: 1.8rem;
  }
  .hero-content .hero-subtitle {
    font-size: 1rem;
  }
  .hero-banner {
    min-height: 400px;
  }
  .section {
    padding: 40px 0;
  }
  .section-title h2 {
    font-size: 1.5rem;
  }
  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
  }
  .expert-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-inner {
    height: 60px;
  }
  .logo-img {
    height: 36px;
  }
  .logo-text {
    font-size: 1.1rem;
  }
  .search-bar {
    margin-top: 60px;
  }
  .hero-content h1 {
    font-size: 1.5rem;
  }
  .video-grid {
    grid-template-columns: 1fr;
  }
  .expert-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .review-grid {
    grid-template-columns: 1fr;
  }
  .community-grid {
    grid-template-columns: 1fr;
  }
}

/* ============ 动画效果 ============ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* ============ MCP服务前端占位 ============ */
.mcp-widget {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid rgba(233,69,96,0.2);
  text-align: center;
}

.mcp-widget h4 {
  color: var(--accent);
  margin-bottom: 10px;
}

.mcp-widget p {
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* ============ 视频播放器弹窗 ============ */
.video-player-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.9);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.video-player-container {
  width: 90%;
  max-width: 900px;
  background: #111;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 0 40px rgba(255,107,53,0.3);
}

.video-player-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: rgba(255,107,53,0.1);
  border-bottom: 1px solid rgba(255,107,53,0.2);
}

.video-player-title {
  color: var(--text-bright);
  font-size: 0.95rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 80%;
}

.video-player-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
  transition: var(--transition);
}

.video-player-close:hover {
  color: var(--accent);
}

.video-player-body {
  position: relative;
}

.video-player-screen {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: #000;
  overflow: hidden;
}

.video-player-screen img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7);
}

.video-player-center-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: rgba(255,107,53,0.8);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition);
}

.video-player-center-btn:hover {
  background: rgba(255,107,53,1);
  transform: translate(-50%, -50%) scale(1.1);
}

.video-player-controls {
  background: #1a1a1a;
  padding: 10px 16px;
}

.video-progress {
  width: 100%;
  height: 4px;
  background: #333;
  border-radius: 2px;
  margin-bottom: 10px;
  cursor: pointer;
}

.video-progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width 0.1s linear;
}

.video-control-btns {
  display: flex;
  align-items: center;
  gap: 16px;
}

.vp-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px;
  transition: var(--transition);
}

.vp-btn:hover {
  color: var(--primary);
}

.vp-time {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-left: auto;
}

.vp-fullscreen {
  margin-left: 8px;
}

/* 回到顶部 show 状态 */
.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

/* ============ 搜索栏内页无margin-top ============ */
.breadcrumb + .page-header {
  margin-top: 0;
}