/* ============================================
   黄片 - 原创样式表
   品牌色系：蜜桃粉 + 深紫黑 + 暖橙
   ============================================ */

/* CSS变量定义 */
:root {
  --mt-primary: #FF6B8A;
  --mt-primary-light: #FF8FA3;
  --mt-primary-dark: #E5506E;
  --mt-secondary: #FFB347;
  --mt-dark: #2D1B2E;
  --mt-dark-light: #3D2B3E;
  --mt-bg: #FFF5F7;
  --mt-bg-alt: #FFF0F3;
  --mt-text: #1A1A2E;
  --mt-text-light: #6B6B80;
  --mt-white: #FFFFFF;
  --mt-border: #FFD6DE;
  --mt-shadow: rgba(255,107,138,0.15);
  --mt-gradient: linear-gradient(135deg, #FF6B8A 0%, #FF8FA3 50%, #FFB347 100%);
  --mt-gradient-dark: linear-gradient(135deg, #2D1B2E 0%, #3D2B3E 100%);
  --mt-radius: 12px;
  --mt-radius-sm: 8px;
  --mt-radius-lg: 20px;
  --mt-transition: all 0.3s ease;
}

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

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

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  color: var(--mt-text);
  background-color: var(--mt-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--mt-primary-dark);
}

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

ul, ol {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================
   顶部导航栏
   ============================================ */
.mt-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px var(--mt-shadow);
  transition: var(--mt-transition);
}

.mt-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

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

.mt-logo img {
  height: 42px;
  width: auto;
}

.mt-logo span {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--mt-dark);
  letter-spacing: 1px;
}

.mt-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.mt-nav a {
  color: var(--mt-text);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
}

.mt-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--mt-gradient);
  transition: width 0.3s ease;
}

.mt-nav a:hover::after,
.mt-nav a.active::after {
  width: 100%;
}

.mt-nav a:hover {
  color: var(--mt-primary);
}

.mt-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.mt-hamburger span {
  width: 25px;
  height: 2px;
  background: var(--mt-dark);
  transition: var(--mt-transition);
}

/* ============================================
   搜索栏
   ============================================ */
.mt-search-bar {
  background: var(--mt-gradient);
  padding: 12px 0;
  margin-top: 70px;
}

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

.mt-search-wrap {
  display: flex;
  align-items: center;
  background: var(--mt-white);
  border-radius: 50px;
  padding: 4px 4px 4px 20px;
  width: 100%;
  max-width: 600px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.mt-search-wrap input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 0.95rem;
  color: var(--mt-text);
  background: transparent;
  padding: 8px 0;
}

.mt-search-wrap input::placeholder {
  color: var(--mt-text-light);
}

.mt-search-wrap button {
  background: var(--mt-gradient);
  border: none;
  color: var(--mt-white);
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--mt-transition);
  white-space: nowrap;
}

.mt-search-wrap button:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

/* ============================================
   面包屑导航
   ============================================ */
.mt-breadcrumb {
  padding: 15px 0;
  font-size: 0.85rem;
  color: var(--mt-text-light);
}

.mt-breadcrumb a {
  color: var(--mt-text-light);
}

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

.mt-breadcrumb span {
  margin: 0 8px;
}

/* ============================================
   Hero Banner
   ============================================ */
.mt-hero {
  position: relative;
  height: 520px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mt-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.6);
}

.mt-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--mt-white);
  padding: 0 20px;
}

.mt-hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
  line-height: 1.3;
}

.mt-hero-content p {
  font-size: 1.15rem;
  margin-bottom: 28px;
  opacity: 0.95;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.mt-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 24px;
}

.mt-hero-tags span {
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(5px);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  border: 1px solid rgba(255,255,255,0.3);
}

.mt-btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--mt-transition);
  border: none;
  text-align: center;
}

.mt-btn-primary {
  background: var(--mt-gradient);
  color: var(--mt-white);
  box-shadow: 0 4px 15px var(--mt-shadow);
}

.mt-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--mt-shadow);
  color: var(--mt-white);
}

.mt-btn-outline {
  background: transparent;
  color: var(--mt-white);
  border: 2px solid var(--mt-white);
}

.mt-btn-outline:hover {
  background: var(--mt-white);
  color: var(--mt-primary);
}

.mt-btn-dark {
  background: var(--mt-dark);
  color: var(--mt-white);
}

.mt-btn-dark:hover {
  background: var(--mt-dark-light);
  color: var(--mt-white);
}

/* ============================================
   通用板块标题
   ============================================ */
.mt-section {
  padding: 60px 0;
}

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

.mt-section-dark {
  background: var(--mt-gradient-dark);
  color: var(--mt-white);
}

.mt-section-title {
  text-align: center;
  margin-bottom: 45px;
}

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

.mt-section-dark .mt-section-title h2 {
  color: var(--mt-white);
}

.mt-section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--mt-gradient);
  margin: 10px auto 0;
  border-radius: 2px;
}

.mt-section-title p {
  color: var(--mt-text-light);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.mt-section-dark .mt-section-title p {
  color: rgba(255,255,255,0.7);
}

/* ============================================
   视频卡片网格
   ============================================ */
.mt-video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.mt-video-card {
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
  transition: var(--mt-transition);
  cursor: pointer;
}

.mt-video-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px var(--mt-shadow);
}

.mt-video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
}

.mt-video-thumb img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.mt-video-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: rgba(255,107,138,0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--mt-transition);
}

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

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

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

.mt-video-info {
  padding: 14px;
}

.mt-video-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.mt-video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--mt-text-light);
}

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

.mt-video-tag {
  display: inline-block;
  background: var(--mt-bg);
  color: var(--mt-primary);
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
  margin-top: 8px;
}

/* ============================================
   服务模块
   ============================================ */
.mt-service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.mt-service-card {
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  padding: 30px 24px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  transition: var(--mt-transition);
  border: 1px solid transparent;
}

.mt-service-card:hover {
  border-color: var(--mt-primary-light);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--mt-shadow);
}

.mt-service-icon {
  width: 64px;
  height: 64px;
  background: var(--mt-gradient);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.8rem;
}

.mt-service-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--mt-dark);
}

.mt-service-card p {
  font-size: 0.9rem;
  color: var(--mt-text-light);
  line-height: 1.6;
}

/* ============================================
   专家展示
   ============================================ */
.mt-expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.mt-expert-card {
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
  transition: var(--mt-transition);
  text-align: center;
}

.mt-expert-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px var(--mt-shadow);
}

.mt-expert-avatar {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.mt-expert-info {
  padding: 18px;
}

.mt-expert-info h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.mt-expert-info .role {
  color: var(--mt-primary);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.mt-expert-info p {
  font-size: 0.85rem;
  color: var(--mt-text-light);
  margin-bottom: 12px;
}

.mt-expert-btns {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.mt-expert-btns a {
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.8rem;
  border: 1px solid var(--mt-primary);
  color: var(--mt-primary);
  transition: var(--mt-transition);
}

.mt-expert-btns a:hover {
  background: var(--mt-primary);
  color: var(--mt-white);
}

/* ============================================
   用户评论
   ============================================ */
.mt-review-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.mt-review-card {
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  padding: 24px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  border-left: 4px solid var(--mt-primary);
}

.mt-review-stars {
  color: var(--mt-secondary);
  font-size: 1rem;
  margin-bottom: 10px;
}

.mt-review-card blockquote {
  font-size: 0.95rem;
  color: var(--mt-text);
  line-height: 1.7;
  margin-bottom: 14px;
  font-style: italic;
}

.mt-review-author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mt-review-author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--mt-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--mt-white);
  font-weight: 700;
  font-size: 0.9rem;
}

.mt-review-author-info strong {
  font-size: 0.9rem;
  display: block;
}

.mt-review-author-info span {
  font-size: 0.8rem;
  color: var(--mt-text-light);
}

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

.mt-faq-item {
  background: var(--mt-white);
  border-radius: var(--mt-radius-sm);
  margin-bottom: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
  overflow: hidden;
}

.mt-faq-question {
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--mt-transition);
}

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

.mt-faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--mt-primary);
  transition: var(--mt-transition);
}

.mt-faq-item.open .mt-faq-question::after {
  content: '-';
}

.mt-faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

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

.mt-faq-answer p {
  font-size: 0.9rem;
  color: var(--mt-text-light);
  line-height: 1.7;
}

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

.mt-partner-item {
  background: var(--mt-white);
  padding: 16px 28px;
  border-radius: var(--mt-radius-sm);
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
  font-size: 1rem;
  font-weight: 600;
  color: var(--mt-text-light);
  transition: var(--mt-transition);
}

.mt-partner-item:hover {
  color: var(--mt-primary);
  box-shadow: 0 4px 15px var(--mt-shadow);
}

/* ============================================
   联系我们
   ============================================ */
.mt-contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.mt-contact-info {
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.mt-contact-info h3 {
  font-size: 1.2rem;
  margin-bottom: 18px;
  color: var(--mt-dark);
}

.mt-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.mt-contact-item .icon {
  width: 36px;
  height: 36px;
  background: var(--mt-bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--mt-primary);
  font-size: 1rem;
}

.mt-contact-qr {
  display: flex;
  gap: 24px;
  justify-content: center;
}

.mt-contact-qr-item {
  text-align: center;
}

.mt-contact-qr-item img {
  width: 150px;
  height: 150px;
  border-radius: var(--mt-radius-sm);
  margin-bottom: 8px;
}

.mt-contact-qr-item p {
  font-size: 0.85rem;
  color: var(--mt-text-light);
}

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

.mt-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--mt-white);
  transition: var(--mt-transition);
}

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

.mt-share-wechat { background: #07C160; }
.mt-share-weibo { background: #E6162D; }
.mt-share-douyin { background: #161823; }
.mt-share-bilibili { background: #00A1D6; }

/* ============================================
   页脚
   ============================================ */
.mt-footer {
  background: var(--mt-dark);
  color: rgba(255,255,255,0.7);
  padding: 50px 0 0;
}

.mt-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mt-footer-brand img {
  height: 40px;
  margin-bottom: 14px;
}

.mt-footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.mt-footer h4 {
  color: var(--mt-white);
  font-size: 1rem;
  margin-bottom: 16px;
}

.mt-footer-links a {
  display: block;
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.mt-footer-links a:hover {
  color: var(--mt-primary);
}

.mt-footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 0.85rem;
}

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

/* ============================================
   How-To 指南
   ============================================ */
.mt-howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.mt-howto-step {
  text-align: center;
  padding: 24px;
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  position: relative;
}

.mt-howto-step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--mt-gradient);
  color: var(--mt-white);
  border-radius: 50%;
  font-weight: 700;
  margin: 0 auto 14px;
}

.mt-howto-step h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.mt-howto-step p {
  font-size: 0.85rem;
  color: var(--mt-text-light);
}

/* ============================================
   内页通用
   ============================================ */
.mt-page-header {
  background: var(--mt-gradient);
  padding: 80px 0 40px;
  text-align: center;
  color: var(--mt-white);
  margin-top: 70px;
}

.mt-page-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.mt-page-header p {
  font-size: 1rem;
  opacity: 0.9;
}

.mt-content-section {
  padding: 40px 0;
}

.mt-content-section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--mt-dark);
}

.mt-content-section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--mt-dark);
}

.mt-content-section p {
  margin-bottom: 16px;
  line-height: 1.8;
}

/* ============================================
   懒加载占位
   ============================================ */
.lazy-placeholder {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================
   统计数据条
   ============================================ */
.mt-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 30px 0;
}

.mt-stat-item {
  text-align: center;
}

.mt-stat-item .number {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--mt-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mt-stat-item .label {
  font-size: 0.9rem;
  color: var(--mt-text-light);
  margin-top: 4px;
}

/* ============================================
   标签云
   ============================================ */
.mt-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.mt-tag {
  display: inline-block;
  padding: 5px 14px;
  background: var(--mt-bg);
  color: var(--mt-text);
  border-radius: 50px;
  font-size: 0.85rem;
  transition: var(--mt-transition);
}

.mt-tag:hover {
  background: var(--mt-primary);
  color: var(--mt-white);
}

/* ============================================
   移动端响应式
   ============================================ */
@media (max-width: 1024px) {
  .mt-video-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .mt-expert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .mt-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .mt-howto-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mt-nav {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--mt-white);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  }

  .mt-nav.active {
    display: flex;
  }

  .mt-hamburger {
    display: flex;
  }

  .mt-hero {
    height: 400px;
  }

  .mt-hero-content h1 {
    font-size: 1.8rem;
  }

  .mt-video-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .mt-service-grid {
    grid-template-columns: 1fr;
  }

  .mt-expert-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .mt-review-grid {
    grid-template-columns: 1fr;
  }

  .mt-contact-grid {
    grid-template-columns: 1fr;
  }

  .mt-stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .mt-footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .mt-howto-steps {
    grid-template-columns: 1fr;
  }

  .mt-section {
    padding: 40px 0;
  }

  .mt-section-title h2 {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .mt-video-grid {
    grid-template-columns: 1fr;
  }

  .mt-expert-grid {
    grid-template-columns: 1fr;
  }

  .mt-hero {
    height: 320px;
  }

  .mt-hero-content h1 {
    font-size: 1.5rem;
  }

  .mt-contact-qr {
    flex-direction: column;
    align-items: center;
  }
}

/* ============================================
   动画效果
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   社区功能模块
   ============================================ */
.mt-community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.mt-community-card {
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  padding: 24px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  transition: var(--mt-transition);
  border-top: 3px solid var(--mt-primary);
}

.mt-community-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--mt-shadow);
}

.mt-community-card h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--mt-dark);
}

.mt-community-card p {
  font-size: 0.85rem;
  color: var(--mt-text-light);
}

/* 更新时间 */
.mt-update-time {
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  padding-top: 10px;
}

/* ========== 联系表单 ========== */
.mt-contact-form {
  max-width: 800px;
  margin: 30px auto 0;
}

.mt-form-row {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.mt-form-group {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.mt-form-group label {
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--mt-text);
  font-size: 14px;
}

.mt-form-group input,
.mt-form-group select,
.mt-form-group textarea {
  padding: 12px 16px;
  border: 2px solid var(--mt-border);
  border-radius: var(--mt-radius-sm);
  font-size: 15px;
  font-family: inherit;
  background: var(--mt-white);
  color: var(--mt-text);
  transition: var(--mt-transition);
  outline: none;
}

.mt-form-group input:focus,
.mt-form-group select:focus,
.mt-form-group textarea:focus {
  border-color: var(--mt-primary);
  box-shadow: 0 0 0 3px rgba(255,107,138,0.15);
}

.mt-form-group textarea {
  resize: vertical;
  min-height: 120px;
}

@media (max-width: 768px) {
  .mt-form-row {
    flex-direction: column;
    gap: 15px;
  }
}

/* ========== 视频播放按钮show类 ========== */
.mt-video-play.show {
  opacity: 1;
}

/* ========== 内容段落区域 ========== */
.mt-content-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 0;
}

.mt-content-section h2 {
  font-size: 1.8rem;
  color: var(--mt-text);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--mt-primary);
  display: inline-block;
}

.mt-content-section h3 {
  font-size: 1.4rem;
  color: var(--mt-text);
  margin: 30px 0 14px;
}

.mt-content-section p {
  color: var(--mt-text-light);
  line-height: 1.9;
  margin-bottom: 16px;
  text-indent: 2em;
}

/* ========== 文章资讯模块 ========== */
.mt-article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.mt-article-card {
  display: flex;
  background: var(--mt-white);
  border-radius: var(--mt-radius);
  overflow: hidden;
  box-shadow: 0 2px 12px var(--mt-shadow);
  transition: var(--mt-transition);
  border: 1px solid var(--mt-border);
}

.mt-article-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(255,107,138,0.2);
}

.mt-article-thumb {
  width: 220px;
  min-width: 220px;
  overflow: hidden;
}

.mt-article-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.mt-article-body {
  padding: 18px 20px;
  flex: 1;
}

.mt-article-date {
  font-size: 12px;
  color: var(--mt-text-light);
  display: block;
  margin-bottom: 8px;
}

.mt-article-body h3 {
  font-size: 1rem;
  color: var(--mt-text);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.mt-article-body p {
  font-size: 13px;
  color: var(--mt-text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
}

.mt-article-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.mt-article-tags span {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--mt-bg-alt);
  color: var(--mt-primary);
  border-radius: 4px;
}

@media (max-width: 768px) {
  .mt-article-grid {
    grid-template-columns: 1fr;
  }
  .mt-article-card {
    flex-direction: column;
  }
  .mt-article-thumb {
    width: 100%;
    min-width: 100%;
    height: 180px;
  }
}