:root{
  --bg:#f5f7fb;
  --bg-soft:#eef2f9;
  --fg:#161a2b;
  --muted:#5c6378;
  --card:#ffffff;
  --card-glass:rgba(255,255,255,.72);
  --accent:#e94560;
  --accent-2:#0f3460;
  --accent-3:#7b5cff;
  --line:#e2e7f1;
  --shadow:0 18px 40px -18px rgba(15,52,96,.28);
  --shadow-soft:0 10px 26px -16px rgba(15,52,96,.32);
  --radius:16px;
  --radius-sm:12px;
  --radius-lg:22px;
  --grad-hero:linear-gradient(135deg,#1a1a2e 0%,#0f3460 52%,#3b1f5e 100%);
  --grad-accent:linear-gradient(135deg,#e94560 0%,#7b5cff 100%);
}

body.dark{
  --bg:#0b0f1c;
  --bg-soft:#111728;
  --fg:#e9edf7;
  --muted:#98a2ba;
  --card:#151b2d;
  --card-glass:rgba(21,27,45,.7);
  --line:#242e48;
  --shadow:0 18px 44px -18px rgba(0,0,0,.65);
  --shadow-soft:0 10px 26px -16px rgba(0,0,0,.6);
  --grad-hero:linear-gradient(135deg,#0b0f1c 0%,#131b34 55%,#241436 100%);
}

*{margin:0;padding:0;box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--fg);
  line-height:1.8;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  transition:background .35s ease,color .35s ease;
  overflow-x:hidden;
}

a{color:inherit;text-decoration:none;transition:color .25s ease}
a:hover{color:var(--accent)}

img,svg{display:block;max-width:100%}

button{font-family:inherit}

.wrap{max-width:1180px;margin:0 auto;padding:0 20px}

/* ---------- Header ---------- */
header.site{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--card-glass);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid var(--line);
  transition:background .35s ease,border-color .35s ease;
}

.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:66px;
  gap:16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  font-size:18px;
  letter-spacing:.3px;
  white-space:nowrap;
}

.brand .logo{
  width:38px;
  height:38px;
  border-radius:12px;
  background:var(--grad-accent);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:18px;
  font-weight:800;
  box-shadow:0 8px 18px -8px rgba(233,69,96,.7);
  transition:transform .35s ease;
}

.brand:hover .logo{transform:rotate(-8deg) scale(1.06)}

.nav ul{
  display:flex;
  gap:24px;
  list-style:none;
}

.nav ul a{
  position:relative;
  color:var(--muted);
  font-size:15px;
  font-weight:500;
  padding:4px 0;
}

.nav ul a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-2px;
  width:0;
  height:2px;
  border-radius:2px;
  background:var(--grad-accent);
  transition:width .3s ease;
}

.nav ul a:hover{color:var(--accent)}
.nav ul a:hover::after{width:100%}

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

.search-box{
  display:flex;
  align-items:center;
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:999px;
  padding:5px 14px;
  transition:border-color .3s ease,box-shadow .3s ease;
}

.search-box:focus-within{
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(233,69,96,.14);
}

.search-box input{
  border:none;
  background:transparent;
  outline:none;
  color:var(--fg);
  width:132px;
  font-size:14px;
}

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

.btn{
  border:none;
  cursor:pointer;
  border-radius:999px;
  padding:9px 18px;
  font-size:14px;
  font-weight:600;
  background:var(--grad-accent);
  color:#fff;
  transition:transform .25s ease,box-shadow .25s ease,filter .25s ease;
}

.btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px -10px rgba(233,69,96,.75)}
.btn:active{transform:translateY(0)}

.btn.ghost{
  background:transparent;
  border:1px solid var(--line);
  color:var(--fg);
}

.btn.ghost:hover{
  border-color:var(--accent);
  color:var(--accent);
  box-shadow:none;
}

.menu-toggle{
  display:none;
  background:transparent;
  border:1px solid var(--line);
  border-radius:10px;
  padding:6px 11px;
  color:var(--fg);
  cursor:pointer;
  font-size:16px;
  transition:border-color .25s ease,color .25s ease;
}

.menu-toggle:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- Breadcrumb ---------- */
.breadcrumb{
  font-size:13.5px;
  color:var(--muted);
  padding:16px 0;
}

.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{margin:0 6px}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  overflow:hidden;
  background:var(--grad-hero);
  color:#fff;
  padding:70px 0 64px;
  transition:background .4s ease;
}

.hero::before,
.hero::after{
  content:"";
  position:absolute;
  border-radius:50%;
  filter:blur(70px);
  opacity:.5;
  pointer-events:none;
}

.hero::before{
  width:420px;
  height:420px;
  background:radial-gradient(circle,#e94560 0%,transparent 70%);
  top:-160px;
  right:-80px;
}

.hero::after{
  width:380px;
  height:380px;
  background:radial-gradient(circle,#7b5cff 0%,transparent 70%);
  bottom:-180px;
  left:-100px;
}

.hero .wrap{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:44px;
  align-items:center;
}

.hero h1{
  font-size:38px;
  line-height:1.32;
  margin-bottom:18px;
  letter-spacing:.5px;
  font-weight:800;
}

.hero h1 em{
  font-style:normal;
  background:linear-gradient(120deg,#ff8fa0 0%,#ffd36e 60%,#7b5cff 100%);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  color:transparent;
}

.hero p{
  color:#c9d1e6;
  font-size:16px;
  margin-bottom:24px;
}

.hero .cta{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

.hero .cta a{
  padding:12px 24px;
  border-radius:999px;
  font-weight:600;
  font-size:15px;
  transition:transform .3s ease,box-shadow .3s ease,background .3s ease;
}

.hero .cta .p1{
  background:var(--grad-accent);
  color:#fff;
  box-shadow:0 12px 26px -12px rgba(233,69,96,.85);
}

.hero .cta .p1:hover{transform:translateY(-3px);box-shadow:0 16px 32px -12px rgba(233,69,96,.95)}

.hero .cta .p2{
  border:1px solid rgba(255,255,255,.35);
  color:#fff;
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}

.hero .cta .p2:hover{
  background:rgba(255,255,255,.12);
  transform:translateY(-3px);
  color:#fff;
}

.hero-stats{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
  margin-top:34px;
}

.stat{
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius);
  padding:16px;
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:transform .35s ease,background .35s ease;
}

.stat:hover{
  transform:translateY(-4px);
  background:rgba(255,255,255,.14);
}

.stat b{
  font-size:24px;
  display:block;
  color:#ff8fa0;
  font-weight:800;
  letter-spacing:.5px;
}

.stat span{font-size:13px;color:#c9d1e6}

/* ---------- Carousel ---------- */
.carousel{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.14);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  min-height:330px;
  box-shadow:0 26px 50px -24px rgba(0,0,0,.6);
}

.slide{
  position:absolute;
  inset:0;
  opacity:0;
  transform:translateY(10px);
  transition:opacity .7s ease,transform .7s ease;
  padding:28px;
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  pointer-events:none;
}

.slide.active{
  opacity:1;
  transform:none;
  pointer-events:auto;
}

.slide h3{font-size:20px;margin-bottom:10px;font-weight:700}
.slide p{font-size:14px;color:#c9d1e6}

.dots{
  position:absolute;
  bottom:16px;
  left:28px;
  display:flex;
  gap:8px;
  z-index:2;
}

.dots i{
  width:9px;
  height:9px;
  border-radius:50%;
  background:rgba(255,255,255,.35);
  cursor:pointer;
  transition:background .3s ease,transform .3s ease;
}

.dots i:hover{transform:scale(1.25)}
.dots i.on{background:#ff6b81;transform:scale(1.15)}

/* ---------- Sections ---------- */
section{
  padding:64px 0;
  transition:background .35s ease;
}

.sec-head{
  text-align:center;
  max-width:760px;
  margin:0 auto 44px;
}

.sec-head .tag{
  display:inline-block;
  font-size:13px;
  font-weight:700;
  letter-spacing:2px;
  margin-bottom:12px;
  padding:4px 14px;
  border-radius:999px;
  color:var(--accent);
  background:rgba(233,69,96,.1);
  border:1px solid rgba(233,69,96,.22);
}

.sec-head h2{
  font-size:28px;
  margin-bottom:12px;
  font-weight:800;
  letter-spacing:.4px;
}

.sec-head p{
  color:var(--muted);
  font-size:15px;
}

/* ---------- Grid & Cards ---------- */
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{
  position:relative;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:26px;
  transition:transform .35s ease,box-shadow .35s ease,border-color .35s ease;
  overflow:hidden;
}

.card::before{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  background:linear-gradient(135deg,rgba(233,69,96,.06),rgba(123,92,255,.06));
  opacity:0;
  transition:opacity .35s ease;
  pointer-events:none;
}

.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow);
  border-color:transparent;
}

.card:hover::before{opacity:1}

.card h3{
  position:relative;
  font-size:18px;
  margin-bottom:10px;
  font-weight:700;
}

.card h4{
  position:relative;
  font-size:15px;
  margin:14px 0 6px;
  color:var(--accent-2);
  font-weight:700;
}

body.dark .card h4{color:#7fb2ff}

.card p{
  position:relative;
  color:var(--muted);
  font-size:14.5px;
}

.card .icon{
  width:48px;
  height:48px;
  border-radius:14px;
  background:linear-gradient(135deg,rgba(233,69,96,.12),rgba(123,92,255,.12));
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:16px;
  transition:transform .35s ease;
}

.card:hover .icon{transform:rotate(-6deg) scale(1.08)}

body.dark .card .icon{background:linear-gradient(135deg,rgba(233,69,96,.18),rgba(123,92,255,.18))}

/* ---------- Prose ---------- */
.prose{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:38px;
  transition:background .35s ease,border-color .35s ease;
}

.prose h2{
  font-size:24px;
  margin:36px 0 14px;
  padding-left:16px;
  border-left:5px solid transparent;
  border-image:var(--grad-accent) 1;
  font-weight:800;
}

.prose h2:first-child{margin-top:0}

.prose h3{
  font-size:18px;
  margin:26px 0 10px;
  color:var(--accent-2);
  font-weight:700;
}

body.dark .prose h3{color:#7fb2ff}

.prose h4{
  font-size:15.5px;
  margin:16px 0 8px;
  color:var(--fg);
  font-weight:700;
}

.prose p{
  color:var(--muted);
  margin-bottom:14px;
  font-size:15.5px;
}

.prose ul,
.prose ol{
  margin:0 0 16px 22px;
  color:var(--muted);
  font-size:15.5px;
}

.prose li{margin-bottom:8px}
.prose strong{color:var(--fg)}

/* ---------- Article Grid ---------- */
.article-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
}

.article{
  position:relative;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
  display:flex;
  flex-direction:column;
  transition:transform .35s ease,box-shadow .35s ease,border-color .35s ease;
}

.article:hover{
  transform:translateY(-5px);
  box-shadow:var(--shadow-soft);
  border-color:rgba(233,69,96,.35);
}

.article .meta{
  font-size:12.5px;
  color:var(--muted);
  margin-bottom:10px;
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

.article h3{
  font-size:17px;
  margin-bottom:8px;
  font-weight:700;
  line-height:1.5;
}

.article p{
  color:var(--muted);
  font-size:14.5px;
  flex:1;
}

.article a.more{
  margin-top:16px;
  color:var(--accent);
  font-weight:600;
  font-size:14px;
  display:inline-flex;
  align-items:center;
  gap:4px;
  transition:gap .25s ease;
}

.article a.more:hover{gap:9px}

/* ---------- FAQ ---------- */
.faq-item{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  margin-bottom:12px;
  overflow:hidden;
  transition:border-color .3s ease,box-shadow .3s ease;
}

.faq-item:hover{border-color:rgba(233,69,96,.35)}
.faq-item.open{box-shadow:var(--shadow-soft)}

.faq-q{
  width:100%;
  text-align:left;
  background:transparent;
  border:none;
  cursor:pointer;
  padding:18px 22px;
  font-size:16px;
  font-weight:600;
  color:var(--fg);
  display:flex;
  justify-content:space-between;
  gap:12px;
  align-items:center;
  transition:color .25s ease;
}

.faq-q:hover{color:var(--accent)}

.faq-q .plus{
  color:var(--accent);
  font-size:20px;
  line-height:1;
  transition:transform .35s ease;
}

.faq-item.open .plus{transform:rotate(45deg)}

.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .45s ease,padding .45s ease;
  padding:0 22px;
}

.faq-item.open .faq-a{
  max-height:600px;
  padding-bottom:18px;
}

.faq-a p{
  color:var(--muted);
  font-size:14.5px;
}

/* ---------- HowTo ---------- */
.howto-step{
  display:flex;
  gap:16px;
  margin-bottom:18px;
}

.step-num{
  flex:0 0 40px;
  height:40px;
  border-radius:50%;
  background:var(--grad-accent);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  box-shadow:0 8px 18px -10px rgba(233,69,96,.8);
  transition:transform .3s ease;
}

.howto-step:hover .step-num{transform:scale(1.08)}

/* ---------- Contact ---------- */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
}

.contact-info{margin:0}
.contact-info li{
  list-style:none;
  margin-bottom:14px;
  font-size:15px;
  color:var(--muted);
}

.contact-info li b{
  color:var(--fg);
  display:block;
  font-size:14px;
  margin-bottom:2px;
}

/* ---------- Footer ---------- */
footer.site{
  background:linear-gradient(180deg,#0e1220 0%,#0a0d18 100%);
  color:#aab3c8;
  padding:54px 0 26px;
  margin-top:20px;
}

footer.site .cols{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:32px;
}

footer.site h4{
  color:#fff;
  font-size:15px;
  margin-bottom:14px;
  font-weight:700;
}

footer.site ul{list-style:none}
footer.site li{margin-bottom:9px;font-size:14px}

footer.site a{
  color:#aab3c8;
  transition:color .25s ease,padding-left .25s ease;
}

footer.site a:hover{
  color:#ff8fa0;
  padding-left:4px;
}

footer.site .bottom{
  border-top:1px solid #1e263c;
  margin-top:36px;
  padding-top:20px;
  font-size:13px;
  color:#7c869e;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
}

/* ---------- Back to top ---------- */
#top{
  position:fixed;
  right:22px;
  bottom:26px;
  width:48px;
  height:48px;
  border-radius:50%;
  background:var(--grad-accent);
  color:#fff;
  border:none;
  cursor:pointer;
  font-size:20px;
  display:none;
  z-index:120;
  box-shadow:0 10px 24px -8px rgba(233,69,96,.7);
  transition:transform .3s ease,box-shadow .3s ease;
}

#top:hover{
  transform:translateY(-4px) scale(1.06);
  box-shadow:0 16px 30px -8px rgba(233,69,96,.85);
}

/* ---------- Scroll reveal ---------- */
.reveal{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1);
  will-change:opacity,transform;
}

.reveal.in{
  opacity:1;
  transform:none;
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .hero .wrap{grid-template-columns:1fr;gap:32px}
  .g3,.g4{grid-template-columns:1fr 1fr}
  .article-grid,.contact-grid,footer.site .cols{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .prose{padding:28px}
}

@media(max-width:720px){
  .nav ul{
    display:none;
  }
  .nav ul.open{
    display:flex;
    position:absolute;
    top:66px;
    left:0;
    right:0;
    background:var(--card);
    flex-direction:column;
    padding:16px 20px;
    gap:14px;
    border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-soft);
    animation:slideDown .3s ease;
  }
  @keyframes slideDown{
    from{opacity:0;transform:translateY(-10px)}
    to{opacity:1;transform:none}
  }
  .menu-toggle{display:block}
  .search-box{display:none}
}

@media(max-width:640px){
  .g3,.g4,.g2{grid-template-columns:1fr}
  .hero{padding:52px 0 48px}
  .hero h1{font-size:26px}
  .hero-stats{grid-template-columns:1fr 1fr 1fr;gap:10px}
  .stat{padding:12px}
  .stat b{font-size:19px}
  .stat span{font-size:11.5px}
  .carousel{min-height:300px}
  .sec-head h2{font-size:23px}
  section{padding:48px 0}
  .prose{padding:22px}
  .prose h2{font-size:20px}
  .prose h3{font-size:16.5px}
  .card{padding:22px}
  .article{padding:20px}
  #top{right:16px;bottom:18px;width:44px;height:44px}
}