/* ===== 基础重置 & 变量 ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#f8f9fa;
  --text:#1a1a2e;
  --primary:#ff6b35;
  --secondary:#1a1a2e;
  --card:#fff;
  --shadow:0 8px 32px rgba(0,0,0,.1);
  --gradient:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460,#e94560);
  --glass:rgba(255,255,255,.7);
  --border:#e0e0e0;
  --radius:20px;
  --transition:0.3s ease
}
[data-theme=dark]{
  --bg:#0d0d1a;
  --text:#e0e0e0;
  --card:#1a1a2e;
  --shadow:0 8px 32px rgba(0,0,0,.5);
  --glass:rgba(26,26,46,.8);
  --border:#333
}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  transition:background var(--transition),color var(--transition);
  line-height:1.7;
  overflow-x:hidden
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}

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

/* ===== 按钮 ===== */
.btn{
  display:inline-block;
  padding:12px 28px;
  background:var(--primary);
  color:#fff;
  border-radius:50px;
  text-decoration:none;
  font-weight:600;
  transition:transform var(--transition),box-shadow var(--transition);
  border:none;
  cursor:pointer;
  position:relative;
  overflow:hidden;
  z-index:1
}
.btn::before{
  content:'';
  position:absolute;
  top:0;left:-100%;
  width:100%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);
  transition:left .5s;
  z-index:-1
}
.btn:hover::before{left:100%}
.btn:hover{
  transform:translateY(-3px);
  box-shadow:0 10px 30px rgba(255,107,53,.4)
}

/* ===== 区块通用 ===== */
.section{padding:80px 0}
.section-title{
  text-align:center;
  font-size:2.2rem;
  margin-bottom:50px;
  position:relative;
  font-weight:800
}
.section-title::after{
  content:'';
  display:block;
  width:80px;
  height:4px;
  background:var(--primary);
  margin:15px auto 0;
  border-radius:2px
}

/* ===== 卡片 ===== */
.card{
  background:var(--card);
  border-radius:var(--radius);
  padding:30px;
  box-shadow:var(--shadow);
  transition:transform var(--transition),box-shadow var(--transition);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border:1px solid transparent
}
.card:hover{
  transform:translateY(-8px);
  box-shadow:0 15px 40px rgba(0,0,0,.2);
  border-color:rgba(255,107,53,.2)
}

/* ===== 网格 ===== */
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:30px
}

/* ===== 弹性布局 ===== */
.flex{display:flex;flex-wrap:wrap;gap:20px;align-items:center}
.text-center{text-align:center}
.mt-20{margin-top:20px}
.mb-20{margin-bottom:20px}

/* ===== 毛玻璃 ===== */
.glass{
  background:var(--glass);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border:1px solid rgba(255,255,255,.2)
}

/* ===== 懒加载 ===== */
.lazy{opacity:0;transition:opacity .5s}
.lazy.loaded{opacity:1}

/* ===== 滚动动画 ===== */
.fade-up{
  opacity:0;
  transform:translateY(40px);
  transition:opacity .6s ease,transform .6s ease
}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* ===== Hero ===== */
.hero{
  min-height:90vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--gradient);
  color:#fff;
  text-align:center;
  position:relative;
  overflow:hidden
}
.hero::before{
  content:'';
  position:absolute;
  top:0;left:0;right:0;bottom:0;
  background:url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="rgba(255,255,255,0.05)" d="M0,160L48,176C96,192,192,224,288,213.3C384,203,480,149,576,138.7C672,128,768,160,864,181.3C960,203,1056,213,1152,197.3C1248,181,1344,139,1392,117.3L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E') no-repeat bottom;
  background-size:cover;
  animation:heroWave 10s ease-in-out infinite alternate
}
@keyframes heroWave{
  0%{background-position:0 bottom}
  100%{background-position:100% bottom}
}
.hero h1{
  font-size:3rem;
  margin-bottom:20px;
  text-shadow:0 4px 20px rgba(0,0,0,.3);
  animation:heroText 1s ease-out
}
@keyframes heroText{
  from{opacity:0;transform:translateY(30px)}
  to{opacity:1;transform:translateY(0)}
}
.hero p{
  font-size:1.2rem;
  max-width:700px;
  margin:0 auto 30px;
  opacity:.9;
  animation:heroText 1s ease-out .2s both
}
.hero .btn{
  font-size:1.1rem;
  padding:16px 40px;
  animation:heroText 1s ease-out .4s both
}

/* ===== 导航栏 ===== */
.navbar{
  position:fixed;
  top:0;left:0;right:0;
  z-index:1000;
  background:var(--glass);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(255,255,255,.1);
  padding:15px 0;
  transition:background var(--transition)
}
.navbar .container{
  display:flex;
  justify-content:space-between;
  align-items:center
}
.navbar .logo{
  font-size:1.8rem;
  font-weight:800;
  color:var(--primary);
  text-decoration:none;
  display:flex;
  align-items:center;
  gap:10px;
  transition:transform var(--transition)
}
.navbar .logo:hover{transform:scale(1.02)}
.navbar .nav-menu{
  display:flex;
  gap:25px;
  list-style:none;
  align-items:center
}
.navbar .nav-menu a{
  color:var(--text);
  text-decoration:none;
  font-weight:500;
  transition:color var(--transition);
  position:relative;
  padding:5px 0
}
.navbar .nav-menu a::after{
  content:'';
  position:absolute;
  bottom:-5px;left:0;
  width:0;height:3px;
  background:var(--primary);
  transition:width var(--transition);
  border-radius:2px
}
.navbar .nav-menu a:hover::after,
.navbar .nav-menu a.active::after{width:100%}
.navbar .nav-menu a:hover{color:var(--primary)}
.navbar .nav-toggle{
  display:none;
  flex-direction:column;
  cursor:pointer;
  gap:5px;
  background:none;
  border:none;
  padding:5px
}
.navbar .nav-toggle span{
  width:28px;height:3px;
  background:var(--text);
  border-radius:3px;
  transition:all var(--transition)
}
.navbar .nav-toggle.active span:nth-child(1){
  transform:rotate(45deg) translate(5px,6px)
}
.navbar .nav-toggle.active span:nth-child(2){opacity:0}
.navbar .nav-toggle.active span:nth-child(3){
  transform:rotate(-45deg) translate(5px,-6px)
}
.navbar .nav-right{
  display:flex;
  align-items:center;
  gap:20px
}

/* ===== 主题切换 ===== */
.theme-toggle{
  background:none;
  border:2px solid var(--primary);
  color:var(--primary);
  border-radius:50%;
  width:40px;height:40px;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  font-size:1.2rem;
  transition:all var(--transition)
}
.theme-toggle:hover{
  background:var(--primary);
  color:#fff;
  transform:rotate(30deg)
}

/* ===== 搜索框 ===== */
.search-box{
  display:flex;
  align-items:center;
  background:var(--card);
  border-radius:50px;
  padding:5px 15px;
  border:1px solid var(--border);
  transition:border-color var(--transition),box-shadow var(--transition)
}
.search-box:focus-within{
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(255,107,53,.2)
}
.search-box input{
  border:none;
  background:transparent;
  outline:none;
  padding:8px;
  width:180px;
  color:var(--text)
}
.search-box input::placeholder{color:var(--border)}
.search-box button{
  background:none;
  border:none;
  cursor:pointer;
  color:var(--primary);
  font-size:1.1rem;
  transition:transform var(--transition)
}
.search-box button:hover{transform:scale(1.1)}

/* ===== 面包屑 ===== */
.breadcrumb{
  background:var(--card);
  padding:15px 0;
  border-bottom:1px solid var(--border)
}
.breadcrumb ul{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  font-size:.95rem
}
.breadcrumb ul li{color:var(--text)}
.breadcrumb ul li a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
.breadcrumb ul li a:hover{color:#e05520}
.breadcrumb ul li+li::before{
  content:'/';
  margin-right:10px;
  color:var(--border)
}

/* ===== 轮播 ===== */
.swiper{overflow:hidden;position:relative}
.swiper-wrapper{display:flex;transition:transform .5s ease}
.swiper-slide{min-width:100%;padding:20px}
.swiper-pagination{
  display:flex;
  justify-content:center;
  gap:10px;
  margin-top:20px
}
.swiper-pagination span{
  width:12px;height:12px;
  border-radius:50%;
  background:var(--border);
  cursor:pointer;
  transition:background var(--transition),transform var(--transition)
}
.swiper-pagination span.active{
  background:var(--primary);
  transform:scale(1.3)
}

/* ===== 计数器 ===== */
.counter{
  font-size:3rem;
  font-weight:800;
  color:var(--primary);
  display:inline-block
}

/* ===== FAQ ===== */
.faq-item{
  border-bottom:1px solid var(--border);
  padding:20px 0;
  transition:background var(--transition)
}
.faq-item:hover{background:rgba(255,107,53,.03)}
.faq-question{
  display:flex;
  justify-content:space-between;
  align-items:center;
  cursor:pointer;
  font-weight:600;
  font-size:1.1rem;
  user-select:none
}
.faq-question::after{
  content:'+';
  font-size:1.5rem;
  transition:transform var(--transition);
  color:var(--primary);
  flex-shrink:0
}
.faq-item.active .faq-question::after{transform:rotate(45deg)}
.faq-answer{
  max-height:0;
  overflow:hidden;
  transition:max-height .4s ease,padding .4s;
  padding-top:0
}
.faq-item.active .faq-answer{
  max-height:500px;
  padding-top:15px
}

/* ===== Footer ===== */
.footer{
  background:var(--secondary);
  color:#fff;
  padding:60px 0 20px
}
.footer .grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.footer a{
  color:#ccc;
  text-decoration:none;
  transition:color var(--transition)
}
.footer a:hover{color:var(--primary)}
.footer .copyright{
  border-top:1px solid rgba(255,255,255,.1);
  padding-top:20px;
  margin-top:40px;
  text-align:center;
  font-size:.9rem
}
.footer h4{margin-bottom:15px;color:#fff;font-size:1.1rem}
.footer ul li{margin-bottom:8px}

/* ===== 返回顶部 ===== */
.back-to-top{
  position:fixed;
  bottom:30px;right:30px;
  width:50px;height:50px;
  border-radius:50%;
  background:var(--primary);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.5rem;
  cursor:pointer;
  border:none;
  box-shadow:0 4px 20px rgba(255,107,53,.4);
  opacity:0;
  visibility:hidden;
  transition:all var(--transition);
  z-index:999
}
.back-to-top.show{opacity:1;visibility:visible}
.back-to-top:hover{
  transform:translateY(-5px);
  box-shadow:0 8px 30px rgba(255,107,53,.6)
}

/* ===== 文章卡片 ===== */
.article-card .read-more{
  color:var(--primary);
  text-decoration:none;
  font-weight:600;
  display:inline-block;
  margin-top:10px;
  position:relative;
  transition:padding var(--transition)
}
.article-card .read-more::after{
  content:'→';
  position:absolute;
  right:-20px;
  opacity:0;
  transition:all var(--transition)
}
.article-card .read-more:hover{
  padding-right:25px;
  text-decoration:underline
}
.article-card .read-more:hover::after{
  right:0;
  opacity:1
}
.article-card .meta{
  font-size:.9rem;
  color:var(--border);
  margin:10px 0
}

/* ===== 联系信息 ===== */
.contact-info p{
  margin:10px 0;
  display:flex;
  align-items:center;
  gap:10px
}
.contact-info svg{flex-shrink:0}

/* ===== 合作伙伴 ===== */
.partner-logos{
  display:flex;
  flex-wrap:wrap;
  gap:20px;
  justify-content:center;
  align-items:center
}
.partner-logos svg{
  width:120px;height:60px;
  opacity:.6;
  transition:opacity var(--transition)
}
.partner-logos svg:hover{opacity:1}

/* ===== HowTo步骤 ===== */
.howto-steps ol{
  counter-reset:step;
  list-style:none;
  padding-left:0
}
.howto-steps ol li{
  counter-increment:step;
  padding:15px 0 15px 50px;
  position:relative;
  border-left:3px solid var(--primary);
  margin-bottom:10px;
  transition:background var(--transition)
}
.howto-steps ol li:hover{background:rgba(255,107,53,.05)}
.howto-steps ol li::before{
  content:counter(step);
  position:absolute;
  left:-15px;top:15px;
  width:30px;height:30px;
  background:var(--primary);
  color:#fff;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  transition:transform var(--transition)
}
.howto-steps ol li:hover::before{transform:scale(1.1)}

/* ===== 团队网格 ===== */
.team-grid .card{text-align:center}
.team-grid .card img{
  border-radius:50%;
  width:120px;height:120px;
  margin:0 auto 15px;
  object-fit:cover;
  border:3px solid var(--primary);
  transition:transform var(--transition)
}
.team-grid .card:hover img{transform:scale(1.05)}

/* ===== 订阅表单 ===== */
.newsletter-form{
  display:flex;
  gap:10px;
  max-width:500px;
  margin:20px auto
}
.newsletter-form input{
  flex:1;
  padding:12px 20px;
  border-radius:50px;
  border:1px solid var(--border);
  background:var(--card);
  color:var(--text);
  outline:none;
  transition:border-color var(--transition)
}
.newsletter-form input:focus{border-color:var(--primary)}
.newsletter-form button{padding:12px 30px}

/* ===== 响应式 ===== */
@media(max-width:768px){
  .navbar .nav-menu{
    position:fixed;
    top:70px;left:0;right:0;
    background:var(--glass);
    backdrop-filter:blur(20px);
    flex-direction:column;
    padding:30px;
    gap:20px;
    transform:translateY(-100%);
    opacity:0;
    transition:all .4s;
    pointer-events:none;
    border-bottom:1px solid var(--border);
    max-height:calc(100vh - 70px);
    overflow-y:auto
  }
  .navbar .nav-menu.active{
    transform:translateY(0);
    opacity:1;
    pointer-events:auto
  }
  .navbar .nav-toggle{display:flex}
  .hero h1{font-size:2rem}
  .hero p{font-size:1rem}
  .section-title{font-size:1.8rem}
  .grid{grid-template-columns:1fr}
  .search-box input{width:120px}
  .footer .grid{grid-template-columns:1fr}
  .back-to-top{bottom:20px;right:20px;width:45px;height:45px;font-size:1.2rem}
  .section{padding:60px 0}
  .card{padding:20px}
  .hero{min-height:80vh}
  .newsletter-form{flex-direction:column}
  .newsletter-form button{width:100%}
}
@media(min-width:769px)and (max-width:1024px){
  .grid{grid-template-columns:repeat(2,1fr)}
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{
  background:var(--primary);
  border-radius:4px
}
::-webkit-scrollbar-thumb:hover{background:#e05520}

/* ===== 选中文字 ===== */
::selection{
  background:var(--primary);
  color:#fff
}

/* ===== 焦点样式 ===== */
:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:2px
}

/* ===== 暗色模式下的卡片背景 ===== */
[data-theme=dark] .card{border:1px solid rgba(255,255,255,.05)}

/* ===== 渐变边框动画 (装饰) ===== */
@keyframes gradientBorder{
  0%{border-color:rgba(255,107,53,.3)}
  50%{border-color:rgba(233,69,96,.3)}
  100%{border-color:rgba(255,107,53,.3)}
}
.card:focus-within{
  animation:gradientBorder 2s ease infinite
}