*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#c44b4b;
  --primary-dark:#a83a3a;
  --primary-light:#f0a0a0;
  --bg:#f7f7fa;
  --bg-alt:#ffffff;
  --surface:#ffffff;
  --surface-2:#fafafd;
  --text:#1e1e2f;
  --text-2:#3c3c55;
  --text-3:#5c5c78;
  --text-muted:#999;
  --border:#e4e4ee;
  --border-light:#eeeef5;
  --shadow-sm:0 1px 6px rgba(0,0,0,.03);
  --shadow:0 2px 14px rgba(30,30,60,.06);
  --shadow-lg:0 8px 28px rgba(30,30,60,.1);
  --shadow-primary:0 4px 16px rgba(196,75,75,.4);
  --radius-sm:10px;
  --radius:14px;
  --radius-lg:16px;
  --header-h:64px;
  --hero-grad:linear-gradient(135deg,#1a1a2e 0%,#2d2d4a 60%,#3a3a5c 100%);
  --glass-bg:rgba(255,255,255,.92);
  --glass-border:rgba(228,228,238,.8);
  --transition:.25s cubic-bezier(.4,0,.2,1);
}
body.dark-mode{
  --bg:#12121e;
  --bg-alt:#16162a;
  --surface:#1e1e34;
  --surface-2:#22223a;
  --text:#e8e8f5;
  --text-2:#d0d0e0;
  --text-3:#b8b8d0;
  --text-muted:#8a8aa8;
  --border:#2a2a45;
  --border-light:#2e2e4a;
  --shadow-sm:0 1px 6px rgba(0,0,0,.2);
  --shadow:0 2px 14px rgba(0,0,0,.3);
  --shadow-lg:0 8px 28px rgba(0,0,0,.4);
  --glass-bg:rgba(22,22,38,.95);
  --glass-border:rgba(42,42,69,.8);
  --hero-grad:linear-gradient(135deg,#0e0e1a 0%,#16162a 60%,#1e1e34 100%);
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.8;
  font-size:16px;
  transition:background .3s ease,color .3s ease;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
a{color:var(--text-2);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--primary)}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
button{font-family:inherit}
::selection{background:var(--primary);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:5px}
::-webkit-scrollbar-thumb:hover{background:var(--primary)}
.container{max-width:1200px;margin:0 auto;padding:0 20px;width:100%}

header{
  position:sticky;
  top:0;
  z-index:1000;
  background:var(--glass-bg);
  -webkit-backdrop-filter:blur(12px) saturate(180%);
  backdrop-filter:blur(12px) saturate(180%);
  border-bottom:1px solid var(--border);
  box-shadow:0 2px 12px rgba(0,0,0,.04);
  transition:background .3s ease,border-color .3s ease;
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:var(--header-h);
  gap:20px;
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:700;
  font-size:1.25rem;
  color:var(--text);
  white-space:nowrap;
  transition:transform var(--transition),color var(--transition);
}
.logo:hover{color:var(--text);transform:scale(1.02)}
.logo svg{width:36px;height:36px;flex-shrink:0;transition:transform var(--transition)}
.logo:hover svg{transform:rotate(-6deg) scale(1.05)}
.nav-links{display:flex;gap:22px;font-size:.95rem;flex-wrap:wrap;align-items:center}
.nav-links a{
  color:var(--text-3);
  padding:4px 0;
  border-bottom:2px solid transparent;
  transition:color var(--transition),border-color var(--transition);
  position:relative;
}
.nav-links a:hover{color:var(--primary);border-bottom-color:var(--primary)}
.search-box{
  display:flex;
  align-items:center;
  background:var(--surface-2);
  border:1px solid transparent;
  border-radius:24px;
  padding:6px 6px 6px 14px;
  gap:8px;
  transition:border-color var(--transition),box-shadow var(--transition),background .3s ease;
}
.search-box:focus-within{
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(196,75,75,.12);
  background:var(--surface);
}
.search-box input{
  border:none;
  background:transparent;
  outline:none;
  font-size:.9rem;
  width:130px;
  color:var(--text);
  transition:width var(--transition);
}
.search-box input::placeholder{color:var(--text-muted)}
.search-box input:focus{width:170px}
.search-box button{
  border:none;
  background:var(--primary);
  color:#fff;
  border-radius:20px;
  padding:6px 14px;
  font-size:.85rem;
  cursor:pointer;
  transition:background var(--transition),transform var(--transition);
  white-space:nowrap;
}
.search-box button:hover{background:var(--primary-dark);transform:translateY(-1px)}
.search-box button:active{transform:translateY(0)}
.mobile-menu-btn{
  display:none;
  background:none;
  border:none;
  font-size:1.6rem;
  cursor:pointer;
  color:var(--text);
  padding:4px 8px;
  border-radius:8px;
  transition:background var(--transition),color var(--transition);
  line-height:1;
}
.mobile-menu-btn:hover{background:var(--surface-2);color:var(--primary)}
.dark-mode-toggle{
  background:none;
  border:1px solid var(--border);
  border-radius:20px;
  padding:5px 12px;
  cursor:pointer;
  font-size:.82rem;
  color:var(--text-3);
  transition:border-color var(--transition),color var(--transition),transform var(--transition),background var(--transition);
  line-height:1.4;
  white-space:nowrap;
}
.dark-mode-toggle:hover{border-color:var(--primary);color:var(--primary);transform:rotate(15deg)}

.breadcrumb{
  background:var(--bg-alt);
  border-bottom:1px solid var(--border-light);
  padding:10px 0;
  font-size:.85rem;
  color:var(--text-muted);
  transition:background .3s ease,border-color .3s ease;
}
.breadcrumb a{color:var(--text-3)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span{margin:0 6px;color:var(--text-muted)}

section{padding:56px 0;transition:background .3s ease}
h1{font-size:2rem;font-weight:700;line-height:1.4;margin-bottom:18px;color:var(--text)}
h2{
  font-size:1.55rem;
  font-weight:700;
  margin:0 0 24px;
  color:var(--text);
  border-left:5px solid var(--primary);
  padding-left:16px;
  line-height:1.4;
}
h3{font-size:1.2rem;font-weight:600;margin:28px 0 12px;color:var(--text-2)}
h4{font-size:1.05rem;font-weight:600;margin:18px 0 8px;color:var(--text-3);color:#33335a}
body.dark-mode h4{color:#d0d0e8}
p{margin-bottom:16px;color:var(--text-2)}
p strong{color:var(--text);font-weight:600}

.hero{
  background:var(--hero-grad);
  color:#fff;
  padding:70px 0 60px;
  position:relative;
  overflow:hidden;
  transition:background .3s ease;
}
.hero::before{
  content:"";
  position:absolute;
  top:-50%;
  right:-10%;
  width:600px;
  height:600px;
  background:radial-gradient(circle,rgba(196,75,75,.25) 0%,transparent 70%);
  border-radius:50%;
  pointer-events:none;
  animation:heroGlow 12s ease-in-out infinite alternate;
}
.hero::after{
  content:"";
  position:absolute;
  bottom:-40%;
  left:-5%;
  width:500px;
  height:500px;
  background:radial-gradient(circle,rgba(240,160,160,.15) 0%,transparent 70%);
  border-radius:50%;
  pointer-events:none;
  animation:heroGlow 15s ease-in-out infinite alternate-reverse;
}
@keyframes heroGlow{
  from{transform:translate(0,0) scale(1);opacity:.8}
  to{transform:translate(-30px,30px) scale(1.15);opacity:1}
}
.hero .container{position:relative;z-index:2}
.hero h1{color:#fff;font-size:2.3rem;max-width:820px;text-shadow:0 2px 20px rgba(0,0,0,.2)}
.hero p{color:#d0d0e0;max-width:720px;font-size:1.05rem}
.hero .highlight{
  color:var(--primary-light);
  font-weight:600;
  position:relative;
  white-space:nowrap;
}
.hero-stats{display:flex;gap:40px;margin-top:36px;flex-wrap:wrap}
.stat-item{text-align:left}
.stat-num{
  font-size:2rem;
  font-weight:700;
  color:var(--primary-light);
  font-variant-numeric:tabular-nums;
  line-height:1.2;
}
.stat-label{font-size:.85rem;color:#b8b8d0;margin-top:4px}

.banner-carousel{
  background:rgba(34,34,59,.85);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius-lg);
  padding:28px 32px;
  margin-top:40px;
  color:#fff;
  position:relative;
  overflow:hidden;
  min-height:160px;
  transition:background .3s ease,border-color .3s ease;
}
.banner-carousel::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--primary-light),transparent);
  opacity:.6;
}
.banner-slide{display:none}
.banner-slide.active{display:block;animation:fadeIn .6s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.banner-slide h3{
  color:var(--primary-light);
  margin:0 0 8px;
  font-size:1.15rem;
  border:none;
  padding:0;
}
.banner-slide p{color:#c8c8e0;margin:0;font-size:.95rem}
.banner-dots{display:flex;gap:8px;margin-top:18px}
.banner-dots span{
  width:10px;
  height:10px;
  border-radius:50%;
  background:#55557a;
  cursor:pointer;
  transition:background var(--transition),width var(--transition),border-radius var(--transition);
}
.banner-dots span:hover{background:#8888aa}
.banner-dots span.active{background:var(--primary-light);width:26px;border-radius:6px}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

.card{
  background:var(--surface);
  border-radius:var(--radius);
  padding:26px 24px;
  box-shadow:var(--shadow);
  border:1px solid var(--border-light);
  transition:box-shadow var(--transition),transform var(--transition),border-color var(--transition),background .3s ease;
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--primary),var(--primary-light));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .35s ease;
}
.card:hover{
  box-shadow:var(--shadow-lg);
  transform:translateY(-4px);
  border-color:var(--border);
}
.card:hover::before{transform:scaleX(1)}
.card h3{margin-top:0;font-size:1.1rem}
.card p{font-size:.92rem;color:var(--text-3);margin-bottom:0}
.card-icon{
  width:44px;
  height:44px;
  border-radius:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:14px;
  font-size:1.4rem;
  transition:transform var(--transition);
}
.card:hover .card-icon{transform:scale(1.1) rotate(-5deg)}

.article-list{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.article-item{
  background:var(--surface);
  border-radius:12px;
  padding:22px 22px 18px;
  border:1px solid var(--border-light);
  box-shadow:var(--shadow-sm);
  transition:border-color var(--transition),box-shadow var(--transition),transform var(--transition),background .3s ease;
}
.article-item:hover{
  border-color:var(--border);
  box-shadow:var(--shadow-lg);
  transform:translateY(-3px);
}
.article-item h4{font-size:1rem;margin:0 0 8px;color:var(--text)}
.article-item .meta{font-size:.78rem;color:var(--text-muted);margin-bottom:10px}
.article-item p{
  font-size:.88rem;
  color:var(--text-3);
  margin-bottom:12px;
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.read-more{
  font-size:.85rem;
  color:var(--primary);
  font-weight:500;
  display:inline-flex;
  align-items:center;
  gap:4px;
  transition:gap var(--transition),color var(--transition);
}
.read-more:hover{color:var(--primary-dark);gap:8px}

.faq-item{
  background:var(--surface);
  border-radius:var(--radius-sm);
  margin-bottom:12px;
  border:1px solid var(--border-light);
  overflow:hidden;
  transition:border-color var(--transition),box-shadow var(--transition),background .3s ease;
}
.faq-item:hover{border-color:var(--border)}
.faq-item.open{box-shadow:var(--shadow)}
.faq-question{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:16px 20px;
  cursor:pointer;
  font-weight:600;
  font-size:.98rem;
  color:var(--text);
  background:var(--surface-2);
  transition:background var(--transition),color var(--transition);
  gap:16px;
  -webkit-user-select:none;
  user-select:none;
}
.faq-question:hover{background:var(--surface-2);color:var(--primary)}
.faq-answer{
  padding:0 20px;
  max-height:0;
  overflow:hidden;
  transition:max-height .4s ease,padding .3s ease;
  font-size:.92rem;
  color:var(--text-3);
  line-height:1.75;
}
.faq-item.open .faq-answer{max-height:600px;padding:16px 20px 20px}
.faq-item.open .faq-question{color:var(--primary)}
.faq-icon{
  transition:transform .3s ease,color .3s ease;
  font-size:1.1rem;
  color:var(--text-muted);
  flex-shrink:0;
  line-height:1;
}
.faq-item.open .faq-icon{transform:rotate(45deg);color:var(--primary)}

.howto-step{
  display:flex;
  gap:18px;
  margin-bottom:22px;
  align-items:flex-start;
  padding:18px;
  border-radius:var(--radius);
  background:var(--surface);
  border:1px solid var(--border-light);
  transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition),background .3s ease;
}
.howto-step:hover{
  transform:translateX(6px);
  box-shadow:var(--shadow);
  border-color:var(--border);
}
.step-num{
  flex-shrink:0;
  width:38px;
  height:38px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  font-size:.95rem;
  box-shadow:0 2px 8px rgba(196,75,75,.3);
  transition:transform var(--transition);
}
.howto-step:hover .step-num{transform:scale(1.1) rotate(-8deg)}
.step-content{flex:1}
.step-content h4{margin:0 0 6px}
.step-content p{font-size:.92rem;color:var(--text-3);margin:0}

.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.contact-info p{
  display:flex;
  align-items:flex-start;
  gap:10px;
  font-size:.92rem;
  margin-bottom:14px;
}
.contact-info .label{
  font-weight:600;
  color:var(--text-2);
  min-width:70px;
  flex-shrink:0;
}

.footer{
  background:#16162a;
  color:#a8a8c0;
  padding:50px 0 28px;
  font-size:.88rem;
  transition:background .3s ease;
}
.footer a{color:#c0c0d8;transition:color var(--transition)}
.footer a:hover{color:var(--primary-light)}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:32px;
  margin-bottom:36px;
}
.footer h4{color:#fff;font-size:.95rem;margin:0 0 14px}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer-bottom{
  border-top:1px solid #2a2a45;
  padding-top:22px;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  font-size:.8rem;
  color:#7a7a9a;
}

.back-top{
  position:fixed;
  bottom:32px;
  right:32px;
  width:46px;
  height:46px;
  border-radius:50%;
  background:var(--primary);
  color:#fff;
  border:none;
  font-size:1.3rem;
  cursor:pointer;
  box-shadow:var(--shadow-primary);
  display:flex;
  align-items:center;
  justify-content:center;
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .3s ease,visibility .3s ease,transform .3s ease,background var(--transition);
  z-index:999;
  line-height:1;
}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--primary-dark);transform:translateY(-4px) scale(1.05)}

.fade-up{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .7s cubic-bezier(.4,0,.2,1),transform .7s cubic-bezier(.4,0,.2,1);
  will-change:opacity,transform;
}
.fade-up.visible{opacity:1;transform:translateY(0)}

@media(max-width:900px){
  .grid-3,.grid-4{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:1.7rem}
  section{padding:44px 0}
  .search-box input{width:110px}
  .search-box input:focus{width:130px}
}
@media(max-width:640px){
  .grid-2,.grid-3,.grid-4,.article-list,.contact-grid{grid-template-columns:1fr}
  .nav-links{
    display:none;
    position:absolute;
    top:var(--header-h);
    left:0;
    right:0;
    background:var(--glass-bg);
    -webkit-backdrop-filter:blur(12px);
    backdrop-filter:blur(12px);
    flex-direction:column;
    padding:16px 24px;
    box-shadow:0 8px 24px rgba(0,0,0,.08);
    gap:14px;
    border-bottom:1px solid var(--border);
    animation:slideDown .25s ease;
  }
  .nav-links.open{display:flex}
  @keyframes slideDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
  .nav-links a{padding:8px 0;width:100%;border-bottom:1px solid var(--border-light)}
  .nav-links a:last-child{border-bottom:none}
  .mobile-menu-btn{display:block}
  .search-box input{width:80px}
  .search-box input:focus{width:100px}
  .search-box button{padding:6px 10px;font-size:.8rem}
  .header-inner{gap:8px}
  .logo{font-size:1.1rem}
  .logo svg{width:30px;height:30px}
  .hero{padding:44px 0 40px}
  .hero h1{font-size:1.45rem}
  .hero p{font-size:.95rem}
  .hero-stats{gap:24px}
  .stat-num{font-size:1.5rem}
  .banner-carousel{padding:20px}
  .footer-grid{grid-template-columns:1fr}
  .footer{padding:36px 0 22px}
  .footer-bottom{flex-direction:column;text-align:center;align-items:center}
  .back-top{bottom:20px;right:20px;width:42px;height:42px;font-size:1.15rem}
  section{padding:36px 0}
  h1{font-size:1.5rem}
  h2{font-size:1.3rem}
  h3{font-size:1.1rem}
  .card{padding:22px 20px}
  .article-item{padding:18px 18px 14px}
  .howto-step{flex-direction:row;padding:14px}
  .step-num{width:32px;height:32px;font-size:.85rem}
}
@media(max-width:380px){
  .search-box{display:none}
  .hero h1{font-size:1.3rem}
  .stat-num{font-size:1.3rem}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
  .fade-up{opacity:1;transform:none}
}
@media print{
  header,.back-top,.banner-carousel,.search-box,.dark-mode-toggle,.mobile-menu-btn{display:none}
  body{background:#fff;color:#000}
  .card,.article-item,.faq-item{box-shadow:none;border:1px solid #ccc}
}