*html{background-image:url(about:blank);background-attachment:fixed}
body{font:14px/24px "\5FAE\8F6F\96C5\9ED1","\5B8B\4F53";_font-family:"\5B8B\4F53";color:#333;background-color:#f5f7fa}
a,body,dd,div,dl,dt,em,form,h1,h2,h3,html,i,img,input,li,p,span,textarea,ul{margin:0;padding:0}
textarea{font-family:"\5FAE\8F6F\96C5\9ED1","\5B8B\4F53";_font-family:"\5B8B\4F53"}
a{text-decoration:none;color:#333;transition:all 0.3s ease}
a:hover{color:#165DFF}
li,ol,ul{list-style:none}
em,i{font-style:normal}
img{border:none}
.cf{*zoom:1}
.cf:after{content:'';display:block;height:0;clear:both}
.fl,.fr{_display:inline!important;overflow:hidden}
.fl{float:left}
.fr{float:right}
.lh{line-height:500px;overflow:hidden}
.pr{position:relative}
.w{width:1000px;margin:0 auto}
.sfooter{color:#fff;background:#1E293B;height:100px}
.sfooter .copy,.sfooter .menu a{color:#fff}
.sfooter .menu a:hover{color:#38BDF8}
.text-overflow{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
body{background-color:#f5f7fa;font-size:16px;overflow-x:hidden;font-family:'PingFang SC', 'Microsoft YaHei', sans-serif;background-image: linear-gradient(rgba(22, 93, 255, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(22, 93, 255, 0.03) 1px, transparent 1px);background-size: 20px 20px;background-position: -1px -1px;}

/* 滚动动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

.scale-in {
  animation: scaleIn 0.6s ease-out forwards;
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: #165DFF;
  border-radius: 4px;
  transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: #0E42B8;
}
.section-header{position:fixed;top:0;left:0;width:100%;height:80px;z-index:100;background-color:hsla(210, 100%, 25%, 0.95);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);-webkit-transition:all .3s;transition:all .3s;box-shadow:0 2px 10px rgba(0,0,0,0.15)}
.section-header .wrapper{width:1200px;margin:0 auto;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;-webkit-box-orient:horizontal;-webkit-box-direction:normal;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row}
.section-header .wrapper .logo{margin:0;display:flex;align-items:center;height:100%}
.section-header .wrapper .logo img{max-width:200px;max-height:70px;transition:all 0.3s ease}
.section-header .header-nav{height:80px;line-height:80px;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center}
.section-header .header-nav .nav-item{font-size:16px;line-height:28px;color:#fff;-webkit-transition:all .3s;transition:all .3s;margin:0 20px;font-weight:500}
.section-header .header-nav .nav-item:hover{color:#fff;transform:translateY(-2px)}
.section-header .header-nav .nav-item.active{color:#fff;font-weight:700;position:relative}
.section-header .header-nav .nav-item.active::after{content:"";display:block;position:relative;width:24px;height:3px;background-color:#fff;top:0;margin:0 auto;border-radius:2px;-webkit-transition:all .3s;transition:all .3s}
.section-header .about{margin:0;display:flex;align-items:center;margin-left:auto}
.section-header .about a,.section-header .about span{color:#fff;margin-left:20px;font-weight:500}
.section-header .about a:hover{color:#fff;transform:translateY(-2px)}
.section-header .btn-con{background:#4CAF50;color:#fff;padding:8px 16px;border-radius:20px;font-weight:600;transition:all 0.3s ease}
.section-header .btn-con:hover{background:#45a049;transform:translateY(-2px)}
.container{width:1200px;margin:100px auto 0}
.container .banner{width:1200px;height:400px;border-radius:16px;overflow:hidden;box-shadow:0 10px 30px rgba(22, 93, 255, 0.15);margin:0 auto 40px;position:relative;display:flex;align-items:center;justify-content:center;background:#f0f0f0}
.container .banner img{max-width:100%;max-height:100%;display:block;object-fit:contain;transition:transform 0.8s cubic-bezier(0.4, 0, 0.2, 1)}
.container .banner:hover img{transform:scale(1.03)}

/* 视频窗口样式 */
.video-window{
  position:fixed;
  top:50%;
  right:20px;
  transform:translateY(-50%);
  width:300px;
  height:200px;
  background:#000;
  border-radius:12px;
  overflow:hidden;
  box-shadow:0 8px 32px rgba(22, 93, 255, 0.3);
  z-index:9999;
  display:none;
  flex-direction:column;
  backdrop-filter: blur(10px);
  border:1px solid rgba(255, 255, 255, 0.1);
}

.video-window.active{
  display:flex;
}

.video-window .video-header{
  background:rgba(22, 93, 255, 0.9);
  color:#fff;
  padding:10px 16px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:14px;
  font-weight:500;
}

.video-window .video-close{
  background:none;
  border:none;
  color:#fff;
  font-size:20px;
  cursor:pointer;
  padding:0;
  width:24px;
  height:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  transition:background 0.3s ease;
}

.video-window .video-close:hover{
  background:rgba(255, 255, 255, 0.2);
}

.video-window .video-content{
  flex:1;
  position:relative;
}

.video-window .video-content video{
  width:100%;
  height:100%;
  object-fit:cover;
}

.video-window .video-footer{
  background:rgba(22, 93, 255, 0.9);
  padding:10px 16px;
  display:flex;
  justify-content:flex-end;
}

.video-window .video-fullscreen{
  background:#fff;
  color:#165DFF;
  border:none;
  padding:6px 16px;
  border-radius:20px;
  font-size:12px;
  font-weight:600;
  cursor:pointer;
  transition:all 0.3s ease;
  box-shadow:0 2px 8px rgba(0, 0, 0, 0.1);
}

.video-window .video-fullscreen:hover{
  background:#f0f7ff;
  transform:translateY(-2px);
  box-shadow:0 4px 12px rgba(22, 93, 255, 0.3);
}
.container .recommend-section{margin-top:40px}
.container .recommend-header{margin-bottom:30px;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:end;-webkit-align-items:flex-end;-ms-flex-align:end;align-items:flex-end}
.container .recommend-title{font-size:36px;font-weight:700;color:#14171c;line-height:36px;background:linear-gradient(90deg, #165DFF, #0E42B8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.container .recommend-more{margin-left:20px;color:#8b8fa1;text-decoration:none;display:flex;align-items:center;transition:all 0.3s ease}
.container .recommend-more:hover{color:#165DFF;transform:translateX(5px)}
.container .recommend-list{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;gap:20px;flex-wrap:nowrap;justify-content:space-between;overflow-x:auto;padding-bottom:20px}
.container .recommend-list::-webkit-scrollbar{display:none}
.container .recommend-card{-webkit-box-flex:0;-webkit-flex:0 0 calc(20% - 16px);-ms-flex:0 0 calc(20% - 16px);flex:0 0 calc(20% - 16px);width:calc(20% - 16px);background:#fff;border-radius:16px;overflow:hidden;-webkit-box-shadow:0 4px 20px rgba(0,0,0,.08);box-shadow:0 4px 20px rgba(0,0,0,.08);-webkit-transition:all .4s cubic-bezier(0.4, 0, 0.2, 1);transition:all .4s cubic-bezier(0.4, 0, 0.2, 1);position:relative}
.container .recommend-card:hover{-webkit-transform:translateY(-8px) scale(1.02);transform:translateY(-8px) scale(1.02);-webkit-box-shadow:0 12px 32px rgba(22, 93, 255, 0.2);box-shadow:0 12px 32px rgba(22, 93, 255, 0.2)}
.container .recommend-card::before{content:'';position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(90deg, #165DFF, #0E42B8)}
.container .card-visual{position:relative;height:284px;overflow:hidden;border-radius:12px 12px 0 0}
.container .card-visual .card-img-wrap{width:100%;height:100%}
.container .card-visual .card-img-wrap img{width:100%;height:100%;-o-object-fit:cover;object-fit:cover;transition:transform 0.5s ease}
.container .recommend-card:hover .card-img-wrap img{transform:scale(1.05)}
.container .card-body{padding:16px 16px 0}
.container .card-title{font-size:16px;font-weight:700;color:#165DFF;margin:0 0 8px;line-height:1.4;max-width:100%;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;height:48px}
.container .card-bullets{margin:0 0 10px;padding:0;list-style:none;font-size:12px;color:#717274;line-height:1.5}
.container .card-footer{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:justify;-webkit-justify-content:space-between;-ms-flex-pack:justify;justify-content:space-between;padding:12px 0 16px;flex-wrap:wrap;gap:10px}
.container .card-meta{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;font-size:14px;color:#8b8fa1;line-height:16px;flex:1}
.container .card-meta img{margin-right:10px;width:16px;height:16px}
.container .card-lecturer{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;gap:8px;min-width:0}
.container .card-avatar{width:24px;height:24px;border-radius:50%;-o-object-fit:fill;object-fit:fill;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;box-shadow:0 2px 8px rgba(0,0,0,0.1)}
.container .card-lecturer-name{font-size:12px;color:#333;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:1}
.container .card-price{font-size:18px;font-weight:700;color:#ff443d;transition:all 0.3s ease}
.container .recommend-card:hover .card-price{color:#ff443d}
.container .news-section{margin-top:60px}
.container .news-header{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:end;-webkit-align-items:flex-end;-ms-flex-align:end;align-items:flex-end;padding:0 0 20px;margin-bottom:16px}
.container .news-title{font-size:32px;font-weight:700;color:#14171c;line-height:32px}
.container .news-more{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;gap:4px;color:#8b8fa1;text-decoration:none;margin-left:20px}
.container .news-more:hover{color:#6d7185}
.container .news-more-icon{display:inline-block;width:20px;height:20px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23999'%3E%3Cpath d='M17.65 6.35A7.958 7.958 0 0012 4c-4.42 0-8 3.58-8 8s3.58 8 8 8c3.73 0 6.84-2.55 7.73-6h-2.08A5.99 5.99 0 0112 18c-3.31 0-6-2.69-6-6s2.69-6 6-6c1.66 0 3.14.69 4.22 1.78L13 11h7V4l-2.35 2.35z'/%3E%3C/svg%3E") center/contain no-repeat}
.container .news-box{background:#fff;border-radius:8px;padding:24px;-webkit-box-shadow:0 2px 12px rgba(0,0,0,.06);box-shadow:0 2px 12px rgba(0,0,0,.06)}
.container .news-tabs{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;gap:24px;margin-bottom:20px;-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap;border-bottom:1px solid #ececec}
.container .news-tab{color:#666;text-decoration:none;padding-bottom:8px;position:relative}
.container .news-tab:hover{color:#333}
.container .news-tab.active{font-size:16px;color:#333;font-weight:500}
.container .news-tab.active::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:#ff443d}
.container .news-content{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;gap:0;min-height:400px}
.container .news-col{-webkit-box-flex:1;-webkit-flex:1;-ms-flex:1;flex:1;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;gap:0}
.container .news-col-left{min-width:0;padding-right:24px}
.container .news-col-right{min-width:0;padding-left:24px}
.container .news-featured{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:start;-webkit-align-items:flex-start;-ms-flex-align:start;align-items:flex-start;gap:12px;padding:16px 0;text-decoration:none;color:inherit;margin-bottom:12px}
.container .news-featured:hover .news-featured-title{color:#165DFF}
.container .news-featured-tag{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;width:48px;height:48px;background:linear-gradient(90deg, #165DFF, #0E42B8);color:#fff;font-size:12px;font-weight:700;line-height:1.3;text-align:center;padding:8px 4px;-webkit-box-sizing:border-box;box-sizing:border-box;border-radius:12px;border:1px solid rgba(22, 93, 255, 0.3);box-shadow:0 2px 8px rgba(22, 93, 255, 0.3)}
.container .news-row:hover .news-row-title{color:#165DFF}
.container .news-featured-main{-webkit-box-flex:1;-webkit-flex:1;-ms-flex:1;flex:1;min-width:0}
.container .news-featured-title{font-size:15px;font-weight:700;color:#333;margin:0 0 8px;line-height:1.4;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2}
.container .news-featured-meta{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;gap:8px;-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap}
.container .news-featured-date{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;font-size:12px;color:#999}
.container .news-tag{display:inline-block;font-size:12px;color:#165DFF;background:rgba(22, 93, 255, 0.08);padding:2px 8px;border-radius:12px;border:1px solid rgba(22, 93, 255, 0.2);margin-right:8px;line-height:1.4;font-weight:500}
.container .news-row{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;gap:8px;padding:14px 0;text-decoration:none;color:inherit;-webkit-transition:background .2s;transition:background .2s}
.container .news-row:hover{background:#fafafa}
.container .news-row:hover .news-row-title{color:#ff443d}
.container .news-row-title{-webkit-box-flex:1;-webkit-flex:1;-ms-flex:1;flex:1;min-width:0;font-size:14px;color:#333;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:1}
.container .news-row-date{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;font-size:12px;color:#999}
.teacher-section{width:100vw;left:50%;right:50%;margin-left:-50vw;margin-right:-50vw;margin-top:60px;margin-bottom:60px;background:#fff;padding:50px 0 60px;position:relative;overflow-x:clip;overflow-y:hidden;-webkit-box-sizing:border-box;box-sizing:border-box}
.teacher-section-inner{width:1200px;margin:0 auto;position:relative;z-index:1}
.teacher-watermark{position:absolute;left:50%;bottom:80px;-webkit-transform:translateX(-50%);transform:translateX(-50%);font-size:120px;font-weight:700;color:rgba(255,255,255,.05);letter-spacing:8px;white-space:nowrap;pointer-events:none;z-index:0}
.teacher-header{margin-bottom:40px;text-align:center}
.teacher-title{font-size:36px;font-weight:700;color:#333;line-height:1.2;margin:0 0 16px}
.teacher-subtitle{font-size:18px;font-weight:400;color:#666;margin:0;line-height:1.5}
.teacher-main-card{height:480px;background:linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);border-radius:20px;box-shadow:0 8px 32px rgba(22, 93, 255, 0.15);border:1px solid rgba(22, 93, 255, 0.1);position:relative;overflow:hidden}
.teacher-main-card::before{
  content:'';
  position:absolute;
  top:0;
  left:-100%;
  width:100%;
  height:100%;
  background:linear-gradient(90deg, transparent, rgba(22, 93, 255, 0.1), transparent);
  transition:all 0.8s ease;
}
.teacher-main-card:hover::before{
  left:100%;
}
.teacher-main-inner{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;min-height:460px}
.teacher-main-left{-webkit-box-flex:0;-webkit-flex:0 0 52%;-ms-flex:0 0 52%;flex:0 0 52%;padding:40px 30px 38px 40px;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;-webkit-box-pack:start;-webkit-justify-content:flex-start;-ms-flex-pack:start;justify-content:flex-start}
.teacher-name{font-size:32px;font-weight:700;color:#333;margin:0 0 16px;line-height:1.2;transition:all 0.3s ease}
.teacher-tag{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center}
.teacher-tag img{width:36px;height:42px;position:relative;z-index:2}
.teacher-tag .teacher-label{background:#fff -webkit-gradient(linear,left top,right top,from(rgba(22, 93, 255, 0.1)),to(rgba(14, 66, 184, 0.1)));background:#fff linear-gradient(90deg,rgba(22, 93, 255, 0.1),rgba(14, 66, 184, 0.1));height:32px;border-radius:6px;padding:0 14px;margin:0 8px;color:#165DFF;font-weight:500;font-size:14px;line-height:32px;transition:all 0.3s ease;border:1px solid rgba(22, 93, 255, 0.2)}
.teacher-tag .teacher-label.first-label{position:relative;z-index:1;padding-left:28px;margin-left:-22px}
.teacher-description{font-size:16px;color:#666;line-height:1.8;margin:24px 0 0;transition:all 0.3s ease}
.teacher-learn-more{margin-top:30px;width:120px;height:40px;background:#165DFF;border-radius:20px;border:1px solid #165DFF;color:#fff;font-weight:500;font-size:14px;text-align:center;line-height:40px;transition:all 0.3s ease}
.teacher-learn-more:hover{background:#0E42B8;transform:translateY(-2px)}
.teacher-main-right{-webkit-box-flex:0;-webkit-flex:0 0 38%;-ms-flex:0 0 38%;flex:0 0 38%;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-pack:end;-webkit-justify-content:flex-end;-ms-flex-pack:end;justify-content:flex-end;position:relative}
.teacher-avatar-wrap{height:100%;position:relative;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;-ms-flex-pack:center;justify-content:center;overflow:hidden}
.teacher-avatar-wrap::before{content:"";position:absolute;left:50%;bottom:0;-webkit-transform:translateX(-50%);transform:translateX(-50%);width:80%;height:60%;background:radial-gradient(ellipse at center,rgba(255,255,255,.3) 0,transparent 70%);border-radius:50%;z-index:0;transition:all 0.5s ease}
.teacher-avatar-wrap img{position:relative;z-index:1;max-width:100%;max-height:100%;-o-object-fit:contain;object-fit:contain;-o-object-position:center center;object-position:center center;transition:all 0.5s cubic-bezier(0.4, 0, 0.2, 1);box-shadow:0 10px 30px rgba(22, 93, 255, 0.2);border-radius:12px}
.teacher-avatar-wrap:hover img{
  transform:scale(1.05) rotate(2deg);
  box-shadow:0 15px 40px rgba(22, 93, 255, 0.3);
}
.teacher-thumbnail-wrapper{margin-top:-100px;margin-left:40px;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;gap:12px;-webkit-box-align:end;-webkit-align-items:flex-end;-ms-flex-align:end;align-items:flex-end}
.teacher-thumbnail-card{background:#fff;border-radius:12px 12px 30px;height:96px;text-align:center;padding-top:12px;overflow:hidden;margin-right:24px;width:160px;position:relative;cursor:pointer;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;transition:all 0.4s cubic-bezier(0.4, 0, 0.2, 1);box-shadow:0 4px 16px rgba(0,0,0,0.1)}
.teacher-thumbnail-card img{width:100%;height:100%;-o-object-fit:contain;object-fit:contain;-o-object-position:center center;object-position:center center;transition:all 0.3s ease}
.teacher-thumbnail-card:hover{transform:translateY(-5px) scale(1.05);-webkit-box-shadow:0 8px 24px rgba(22, 93, 255, 0.2);box-shadow:0 8px 24px rgba(22, 93, 255, 0.2)}
.teacher-thumbnail-card.active{width:190px;height:116px;transform:translateY(-8px);box-shadow:0 12px 32px rgba(22, 93, 255, 0.3)}
.aboutus{height:500px;width:calc(100vw);margin-left:calc((100vw - 1200px)/ -2);background-position:50%;background-size:cover;background-repeat:no-repeat;position:relative;overflow:hidden}
.aboutus::before{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:transparent;z-index:1}
.aboutus .aboutus-img{width:100%;height:500px;background:no-repeat;background-position:50%;background-size:cover;position:relative;z-index:0}
.aboutus .aboutus-content{position:absolute;top:50%;left:50%;transform:translate(-50%, -50%);z-index:2;text-align:center;color:#333}
.aboutus .aboutus-title{font-size:40px;font-weight:700;margin-bottom:20px}
.aboutus .aboutus-desc{font-size:18px;margin-bottom:30px}
.aboutus .btn-know-more{display:inline-block;padding:12px 32px;background:#fff;color:#165DFF;border-radius:25px;font-weight:600;transition:all 0.3s ease}
.aboutus .btn-know-more:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(22, 93, 255, 0.4)}
.page-footer{background:hsla(210, 100%, 25%, 1);padding:60px 0 40px;color:#fff;position:relative;overflow:hidden}
.page-footer::before{
  content:'';
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 20px 20px;
  background-position: -1px -1px;
  z-index:0;
}
.footer-inner{width:1200px;margin:0 auto;position:relative;z-index:1}
.footer-top{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:start;-webkit-align-items:flex-start;-ms-flex-align:start;align-items:flex-start;gap:60px;padding-bottom:40px}
.footer-brand{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;margin-right:460px}
.footer-logo{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;gap:12px;margin-bottom:16px}
.footer-logo-icon{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;-ms-flex-pack:center;justify-content:center;width:40px;height:40px;background:#fff;color:#1E88E5;font-size:24px;font-weight:700;border-radius:8px;transition:all 0.3s ease}
.footer-logo-icon:hover{transform:rotate(10deg) scale(1.1)}
.footer-logo-text{font-size:24px;font-weight:700;color:#fff}
.footer-tagline{font-size:14px;color:rgba(255,255,255,0.8);margin:0 0 24px;font-style:italic}
.footer-contact{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;gap:10px;margin-bottom:10px}
.footer-phone-icon{width:20px;height:20px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23fff'%3E%3Cpath d='M6.62 10.79c1.44 2.83 3.76 5.14 6.59 6.59l2.2-2.2c.27-.27.67-.36 1.02-.24 1.12.37 2.33.57 3.57.57.55 0 1 .45 1 1V20c0 .55-.45 1-1 1-9.39 0-17-7.61-17-17 0-.55.45-1 1-1h3.5c.55 0 1 .45 1 1 0 1.25.2 2.45.57 3.57.11.35.03.74-.25 1.02l-2.2 2.2z'/%3E%3C/svg%3E") center/contain no-repeat}
.footer-phone{font-size:18px;font-weight:700;color:#fff}
.footer-hours{font-size:14px;color:rgba(255,255,255,0.8);margin:0}
.footer-col{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0}
.footer-col-title{font-size:16px;font-weight:700;color:#fff;margin:0 0 16px}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li{margin-bottom:12px}
.footer-links a{font-size:14px;color:rgba(255,255,255,0.8);text-decoration:none;transition:all 0.3s ease}
.footer-links a:hover{color:#fff;transform:translateX(5px)}
.footer-qr{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;gap:24px;margin-left:auto}
.footer-qr-item{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;text-align:center;transition:all 0.3s ease}
.footer-qr-item:hover{transform:translateY(-5px)}
.footer-qr-item img{width:100px;height:100px;display:block;margin-bottom:8px;border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,0.2)}
.footer-qr-caption{font-size:12px;color:rgba(255,255,255,0.8)}
.footer-divider{height:1px;background:rgba(255,255,255,0.2);margin:0 0 30px}
.footer-bottom{text-align:center}
.footer-legal-links{font-size:12px;color:rgba(255,255,255,0.8);margin:0 0 16px}
.footer-legal-links a{color:rgba(255,255,255,0.8);text-decoration:none;transition:all 0.3s ease}
.footer-legal-links a:hover{color:#fff}
.footer-sep{margin:0 8px;color:rgba(255,255,255,0.5)}
.footer-copyright,.footer-license,.footer-scope{font-size:12px;color:rgba(255,255,255,0.8);margin:0 0 8px;line-height:1.6}
.footer-copyright .footer-sep,.footer-license .footer-sep{color:rgba(255,255,255,0.5);margin-left:12px}
.footer-scope{margin-bottom:0}

/* 响应式设计 */
@media (max-width: 1200px) {
  .section-header .wrapper,
  .container,
  .teacher-section-inner,
  .footer-inner,
  .course-filter-row {
    width: 90%;
    margin: 0 auto;
  }
  
  .container .banner {
    width: 100%;
    height: 300px;
  }
  
  .footer-brand {
    margin-right: 200px;
  }
}

@media (max-width: 992px) {
  .container {
    margin-top: 100px;
  }
  
  .recommend-title,
  .teacher-title {
    font-size: 28px;
  }

  .teacher-main-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .teacher-main-left {
    flex: 1;
    padding: 40px 20px;
  }
  
  .teacher-main-right {
    flex: 1;
    justify-content: center;
  }
  
  .footer-top {
    flex-wrap: wrap;
    gap: 40px;
  }
  
  .footer-brand {
    margin-right: 0;
    width: 100%;
  }
}

@media (max-width: 768px) {
  .section-header .header-nav {
    display: none;
  }
  
  .section-header .about {
    display: none;
  }
  
  .container {
    margin-top: 80px;
  }
  
  .recommend-list {
    flex-direction: column;
    align-items: center;
  }
  
  .recommend-card {
    flex: 0 0 100%;
    width: 100%;
    max-width: 300px;
  }
  
  .teacher-thumbnail-wrapper {
    margin-top: 20px;
    margin-left: 0;
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .teacher-thumbnail-card {
    margin-right: 10px;
  }
  
  .aboutus .aboutus-title {
    font-size: 32px;
  }
  
  .aboutus .aboutus-desc {
    font-size: 16px;
  }
  
  .footer-links {
    flex-wrap: wrap;
  }
  
  .footer-col {
    flex: 0 0 50%;
    margin-bottom: 20px;
  }
  
  .footer-qr {
    margin-left: 0;
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .section-header {
    height: 60px;
  }
  
  .container {
    margin-top: 70px;
  }
  
  .container .banner {
    border-radius: 8px;
    height: 200px;
  }
  
  .container .banner img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
  }
  
  .recommend-title,
  .teacher-title {
    font-size: 24px;
  }
  
  .teacher-main-card {
    height: auto;
  }
  
  .teacher-avatar-wrap {
    min-height: 300px;
  }
  
  .aboutus .aboutus-title {
    font-size: 28px;
  }
  
  .aboutus .btn-know-more {
    padding: 10px 24px;
  }
  
  .footer-col {
    flex: 0 0 100%;
  }
  
  .footer-qr-item {
    margin-right: 10px;
  }
  
  .footer-qr-item img {
    width: 80px;
    height: 80px;
  }
}
.course-filter{background-color:hsla(0,0%,100%,.6);padding:48px 0;width:100vw;margin:-20px auto 0;margin-left:calc((100vw - 1200px)/ -2);-webkit-box-shadow:inset 0 4px 8px rgba(0,0,0,.06);box-shadow:inset 0 4px 8px rgba(0,0,0,.06)}
.course-filter-row{width:1200px;margin:0 auto;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:start;-webkit-align-items:flex-start;-ms-flex-align:start;align-items:flex-start;margin-bottom:20px;position:relative}
.course-filter-row::before{content:"";display:block;position:absolute;border-top:1px dashed #ececec;width:1134px;bottom:-7px;right:0}
.course-filter-row:last-child{margin-bottom:0}
.course-filter-row:last-child::before{display:none}
.course-filter-label{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;width:56px;font-size:16px;color:#14171c;line-height:32px}
.course-filter-label-placeholder{visibility:hidden}
.course-filter-options{-webkit-box-flex:1;-webkit-flex:1;-ms-flex:1;flex:1;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap;gap:4px 8px;min-width:0}
.course-filter-tag{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;color:#717274;padding:5px 14px;font-size:14px;height:18px;line-height:18px;border-radius:16px;-webkit-transition:all .4s;transition:all .4s;cursor:pointer;margin-bottom:10px}
.course-filter-tag:hover{color:#165DFF;transform:translateY(-2px)}
.course-filter-tag.active{background:linear-gradient(90deg, #165DFF, #0E42B8);color:#fff;font-weight:400;box-shadow:0 4px 16px rgba(22, 93, 255, 0.3)}
.course-filter-tag.active:hover{color:#fff;background:linear-gradient(90deg, #165DFF, #0E42B8)}
.course-filter-tag-icon{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0}
.course-filter-tag-icon-pin{width:14px;height:14px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23fff'%3E%3Cpath d='M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7zm0 9.5c-1.38 0-2.5-1.12-2.5-2.5s1.12-2.5 2.5-2.5 2.5 1.12 2.5 2.5-1.12 2.5-2.5 2.5z'/%3E%3C/svg%3E") center/contain no-repeat}
.course-result{max-width:1200px;margin:0 auto;padding:32px 0 48px}
.course-result-count{font-size:18px;font-weight:700;color:#14171c;margin:0 0 20px}
.course-result-count span{color:#f63232;padding:0 6px}
.course-result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.course-result-card{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;height:300px;overflow:hidden;background:#fff;border-radius:16px;padding:20px;-webkit-box-shadow:0 8px 32px rgba(22, 93, 255, 0.15);box-shadow:0 8px 32px rgba(22, 93, 255, 0.15);text-decoration:none;color:inherit;-webkit-transition:all .5s cubic-bezier(0.4, 0, 0.2, 1);transition:all .5s cubic-bezier(0.4, 0, 0.2, 1);position:relative;overflow:hidden}
.course-result-card::before{
  content:'';
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:4px;
  background:linear-gradient(90deg, #165DFF, #0E42B8);
}
.course-result-card:hover{-webkit-box-shadow:0 12px 40px rgba(22, 93, 255, 0.25);box-shadow:0 12px 40px rgba(22, 93, 255, 0.25);-webkit-transform:translateY(-10px) scale(1.02);transform:translateY(-10px) scale(1.02)}
.course-result-name{font-size:16px;font-weight:700;color:#333;margin:0 0 14px;line-height:1.4;min-height:52px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2}
.course-result-teachers{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap;-webkit-box-align:start;-webkit-align-items:flex-start;-ms-flex-align:start;align-items:flex-start;gap:12px 20px;margin-top:auto;margin-bottom:14px}
.course-result-teacher{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;gap:6px;font-size:13px;color:#666}
.course-result-avatar{width:28px;height:28px;border-radius:50%;-o-object-fit:cover;object-fit:cover;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0}
.course-result-divider{height:1px;background:#eee;margin:0 0 14px}
.course-result-footer{height:36px;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:justify;-webkit-justify-content:space-between;-ms-flex-pack:justify;justify-content:space-between}
.course-result-lessons{font-size:13px;color:#999}
.course-result-btn{display:inline-block;padding:6px 16px;font-size:14px;color:#fff;background:linear-gradient(90deg, #165DFF, #0E42B8);border-radius:100px;font-weight:500;box-shadow:0 4px 16px rgba(22, 93, 255, 0.3);transition:all 0.3s ease}
.course-result-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(22, 93, 255, 0.4)}
.course-result-price{font-size:26px;font-weight:700;color:#165DFF}
.course-result-price-symbol{font-size:14px;font-weight:700;vertical-align:.15em;margin-right:1px}
}

/* 免费报名按钮样式 */
.container .btn-register {
  display: inline-block;
  padding: 8px 16px;
  background-color: #ff443d;
  color: white;
  border: none;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(255, 68, 61, 0.3);
}

.container .btn-register:hover {
  background-color: #e03d36;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 68, 61, 0.4);
}

/* 移动端响应式适配 */
@media screen and (max-width:1200px){
  .section-header .wrapper,.container,.course-filter-row,.footer-inner,.teacher-section-inner{width:100%;max-width:1200px;padding:0 20px;box-sizing:border-box}
  .container .banner{width:100%}
}

@media screen and (max-width:768px){
  /* 导航栏适配 */
  .section-header{height:60px}
  .section-header .wrapper{flex-wrap:wrap;height:60px;padding:0 15px}
  .section-header .logo img{max-width:100px;max-height:24px}
  .section-header .header-nav{display:none;position:absolute;top:60px;left:0;width:100%;background:#fff;height:auto;line-height:1;padding:10px 0;box-shadow:0 4px 12px rgba(0,0,0,.1);flex-direction:column}
  .section-header .header-nav.mobile-active{display:flex}
  .section-header .header-nav .nav-item{height:40px;line-height:40px;margin:0 15px;font-size:14px}
  .section-header .header-nav .nav-item.active::after{display:none}
  .section-header .about{margin-left:auto;display:none}
  .section-header .mobile-menu-btn{display:block;width:30px;height:30px;cursor:pointer;position:relative;z-index:101}
  .section-header .mobile-menu-btn span{display:block;width:20px;height:2px;background:#333;position:absolute;transition:.3s}
  .section-header .mobile-menu-btn span:first-child{top:8px}
  .section-header .mobile-menu-btn span:nth-child(2){top:14px}
  .section-header .mobile-menu-btn span:last-child{top:20px}

  /* 容器适配 */
  .container{margin-top:70px;width:100%;padding:0 15px;box-sizing:border-box}
  .container .banner img{width:100%;height:auto}

  /* 今日推荐适配 */
  .container .recommend-list{flex-wrap:wrap;justify-content:center;gap:15px}
  .container .recommend-card{-webkit-flex:0 0 calc(50% - 8px);-ms-flex:0 0 calc(50% - 8px);flex:0 0 calc(50% - 8px);width:calc(50% - 8px)}
  .container .card-visual{height:200px}

  /* 学习资讯适配 */
  .container .news-box{padding:15px}
  .container .news-tabs{gap:12px;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:8px}
  .container .news-tab{font-size:13px;white-space:nowrap;flex-shrink:0}
  .container .news-content{flex-direction:column;gap:15px}
  .container .news-col{padding:0!important;min-width:100%}
  .container .news-featured{flex-direction:column;gap:8px}
  .container .news-featured-tag{width:40px;height:40px;font-size:11px}
  .container .news-row{padding:10px 0}
  .container .news-row-title{font-size:13px}

  /* 教师风采适配 */
  .teacher-section{padding:30px 0;margin-top:20px;margin-bottom:20px}
  .teacher-section-inner{padding:0 15px;box-sizing:border-box}
  .teacher-title{font-size:24px}
  .teacher-subtitle{font-size:14px}
  .teacher-main-card{height:auto;background:none;padding:0}
  .teacher-main-inner{flex-direction:column;min-height:auto}
  .teacher-main-left{-webkit-flex:0 0 100%;-ms-flex:0 0 100%;flex:0 0 100%;padding:0 0 20px}
  .teacher-main-right{-webkit-flex:0 0 100%;-ms-flex:0 0 100%;flex:0 0 100%;padding-top:20px}
  .teacher-name{font-size:26px}
  .teacher-description{font-size:14px}
  .teacher-thumbnail-wrapper{margin-left:0;margin-top:20px;justify-content:center;gap:12px}
  .teacher-thumbnail-card{width:100px;height:60px;padding-top:5px;margin-right:10px}
  .teacher-thumbnail-card.active{width:120px;height:70px}
  .teacher-avatar-wrap{min-height:280px;margin-top:0}
  .teacher-avatar-wrap::before{width:60%;height:50%}

  /* 选课中心适配 */
  .course-filter{padding:30px 0;margin:0 0 20px}
  .course-filter-row{width:100%;padding:0 15px;box-sizing:border-box;margin-bottom:15px}
  .course-filter-row::before{width:calc(100% - 60px)}
  .course-filter-label{font-size:14px;width:50px}
  .course-filter-tag{font-size:13px;padding:4px 12px;margin-bottom:6px}
  .course-result{padding:20px 0 30px}
  .course-result-grid{grid-template-columns:1fr;gap:12px}
  .course-result-card{height:auto;min-height:280px;padding:15px}
  .course-result-name{font-size:15px;min-height:42px}
  .course-result-teacher{font-size:12px}
  .course-result-avatar{width:24px;height:24px}
  .course-result-lessons{font-size:12px}
  .course-result-btn{font-size:13px;padding:5px 14px}
  .course-result-price{font-size:20px}

  /* Footer适配 */
  .page-footer{padding:30px 0}
  .footer-inner{width:100%;padding:0 15px;box-sizing:border-box}
  .footer-top{flex-direction:column;gap:30px}
  .footer-brand{margin-right:0;width:100%}
  .footer-logo-text{font-size:18px}
  .footer-phone{font-size:16px}
  .footer-col{width:100%}
  .footer-col-title{font-size:14px;margin-bottom:10px}
  .footer-qr{margin-left:0;justify-content:center;margin-top:10px}
  .footer-qr-item img{width:90px;height:90px}
  .footer-qr-caption{font-size:11px}
  .footer-legal-links{font-size:11px}
  .footer-copyright,.footer-license,.footer-scope{font-size:11px}

  /* 关于我们图片适配 */
  .aboutus{height:300px;margin-left:calc((100% - 100%)/ -2)}
  .aboutus .aboutus-img{height:300px}
}

@media screen and (max-width:480px){
  /* 小屏幕进一步优化 */
  .container .recommend-card{-webkit-flex:0 0 100%;-ms-flex:0 0 100%;flex:0 0 100%;width:100%;max-width:300px}
  .news-featured{flex-direction:row}
  .news-featured-tag{width:36px;height:36px;font-size:10px}
  .teacher-name{font-size:22px}
}

/* 移动端菜单按钮 */
.mobile-menu-btn{display:none}
@media screen and (max-width:768px){
  .mobile-menu-btn{display:block}
}

/* 优化滚动体验 */
*{-webkit-tap-highlight-color:transparent}
body{-webkit-overflow-scrolling:touch}

/* 图片优化 */
img{max-width:100%;height:auto;display:block}

/* 防止文本溢出 */
.text-ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.text-ellipsis-2{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}

/* 学习资讯标签样式 */
.news-tags{display:flex;gap:10px;flex-wrap:wrap;margin-left:20px}
.news-category-tag{padding:5px 15px;background:#f5f5f5;color:#666;border-radius:15px;font-size:14px;cursor:pointer;transition:all 0.3s ease}
.news-category-tag:hover{background:#e0e0e0}
.news-category-tag.active{background:#165DFF;color:#fff}

/* 底部公示信息 */
.footer{
  background:#14171c;
  color:#a0a4b0;
  text-align:center;
  padding:30px 20px;
  font-size:14px;
  line-height:2;
  margin-top:60px;
  border-top:1px solid rgba(255,255,255,0.06);
}
.footer a{
  color:#a0a4b0;
  text-decoration:none;
  transition:color 0.3s ease;
}
.footer a:hover{
  color:#165DFF;
}