:root{
  --bg:#ffffff;
  --bg-soft:#f6f7f9;
  --text:#111111;
  --muted:#5f6470;
  --line:#e6e7eb;
  --line-strong:#d5d7de;
  --black:#0b0b0b;
  --white:#ffffff;
  --shadow: 0 20px 50px rgba(0,0,0,.08);
  --radius: 22px;
  --radius-sm: 14px;
  --container: 1180px;
  --header-h: 76px;
}

*{ box-sizing:border-box; }
html{
  scroll-behavior:smooth;
  scroll-padding-top: 96px;
}
body{
  margin:0;
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at 10% 10%, rgba(0,0,0,.06), transparent 18%),
    radial-gradient(circle at 90% 20%, rgba(0,0,0,.05), transparent 18%),
    linear-gradient(180deg, #ffffff 0%, #fbfbfc 100%);
  min-height:100vh;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(0,0,0,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.2), transparent 85%);
  opacity:.5;
  z-index:-1;
}

a{ color:inherit; text-decoration:none; }
img{ display:block; max-width:100%; }
p{ line-height:1.75; color:var(--muted); margin:0; }
h1,h2,h3{ margin:0; line-height:1.15; letter-spacing:-0.02em; color:var(--text); }
ul{ margin:0; padding-left:18px; }
li{ line-height:1.7; color:var(--muted); }

.container{
  width:min(var(--container), calc(100% - 40px));
  margin:0 auto;
}

.skip-link{
  position:absolute;
  left:-9999px;
  top:12px;
  background:var(--black);
  color:var(--white);
  padding:10px 14px;
  border-radius:999px;
  z-index:9999;
}
.skip-link:focus{
  left:12px;
}

.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:rgba(255,255,255,.82);
  backdrop-filter: blur(16px);
  border-bottom:1px solid rgba(0,0,0,.06);
}

.nav-wrap{
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:18px;
  justify-content:space-between;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:200px;
}
.brand-logo{
  border-radius:12px;
  border:1px solid var(--line);
  object-fit:cover;
}
.brand-text{
  display:flex;
  flex-direction:column;
  line-height:1.1;
}
.brand-text strong{
  font-size:1rem;
}
.brand-text small{
  color:var(--muted);
  margin-top:3px;
}

.nav-links{
  display:flex;
  align-items:center;
  gap:22px;
}
.nav-links > a{
  font-size:.96rem;
  color:#222;
  padding:10px 0;
  position:relative;
}
.nav-links > a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:4px;
  width:0;
  height:2px;
  background:var(--black);
  transition:width .25s ease;
}
.nav-links > a:hover::after,
.nav-links > a.active::after{
  width:100%;
}
.nav-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:6px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:44px;
  padding:0 18px;
  border-radius:999px;
  font-weight:600;
  border:1px solid transparent;
  transition:transform .2s ease, background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
  white-space:nowrap;
}
.btn:hover{ transform:translateY(-1px); }
.btn-dark{
  background:var(--black);
  color:var(--white);
  border-color:var(--black);
  box-shadow: 0 10px 24px rgba(0,0,0,.12);
}
.btn-dark:hover{
  background:#222;
  border-color:#222;
}
.btn-light{
  background:var(--white);
  color:var(--black);
  border-color:var(--line-strong);
}
.btn-light:hover{
  border-color:var(--black);
}

.menu-toggle{
  display:none;
  width:46px;
  height:46px;
  border:1px solid var(--line-strong);
  background:var(--white);
  border-radius:14px;
  cursor:pointer;
  padding:0 12px;
}
.menu-toggle span{
  display:block;
  height:2px;
  width:100%;
  background:var(--black);
  margin:5px 0;
  border-radius:4px;
}

.hero{
  padding:78px 0 36px;
  position:relative;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap:32px;
  align-items:center;
}
.eyebrow,
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--black);
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.eyebrow::before,
.section-kicker::before{
  content:"";
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--black);
  box-shadow:0 0 0 6px rgba(0,0,0,.06);
}

.section-kicker-s{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--white);
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.eyebrow::before,
.section-kicker-s::before{
  content:"";
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--white);
  box-shadow:0 0 0 6px rgba(0,0,0,.06);
}

.hero h1{
  margin-top:18px;
  font-size: clamp(2.35rem, 5vw, 4.8rem);
  max-width: 12ch;
}
.hero-desc{
  margin-top:18px;
  max-width: 62ch;
  font-size:1.02rem;
}
.hero-actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top:28px;
}
.hero-pills{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:24px;
}
.hero-pills span{
  border:1px solid var(--line);
  background:rgba(255,255,255,.75);
  backdrop-filter: blur(10px);
  padding:10px 14px;
  border-radius:999px;
  font-size:.92rem;
  color:#222;
}

.hero-card{
  background:linear-gradient(180deg, rgba(255,255,255,.92), rgba(248,248,250,.92));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:22px;
  position:relative;
  overflow:hidden;
}
.hero-card::after{
  content:"";
  position:absolute;
  inset:auto -20% -30% auto;
  width:220px;
  height:220px;
  border-radius:50%;
  background:radial-gradient(circle, rgba(0,0,0,.07), transparent 65%);
  filter: blur(2px);
}
.hero-card-top{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:700;
  color:#222;
  margin-bottom:18px;
}
.pulse{
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--black);
  box-shadow:0 0 0 0 rgba(0,0,0,.25);
  animation:pulse 1.8s infinite;
}
@keyframes pulse{
  0%{ box-shadow:0 0 0 0 rgba(0,0,0,.25);}
  70%{ box-shadow:0 0 0 14px rgba(0,0,0,0);}
  100%{ box-shadow:0 0 0 0 rgba(0,0,0,0);}
}
.stat-grid{
  display:grid;
  gap:12px;
}
.stat{
  background:rgba(255,255,255,.85);
  border:1px solid var(--line);
  border-radius:18px;
  padding:14px 16px;
}
.stat strong{
  display:block;
  font-size:.95rem;
  margin-bottom:6px;
}
.stat p{
  font-size:.92rem;
}
.code-panel{
  margin-top:14px;
  background:#0c0c0c;
  color:var(--white);
  border-radius:18px;
  padding:16px 16px 18px;
  position:relative;
}
.code-title{
  color:#bdbdbd;
  font-size:.86rem;
  margin-bottom:10px;
  letter-spacing:.05em;
  text-transform:uppercase;
}
.code-panel p{
  color:#f0f0f0;
}

.section{
  padding:76px 0;
  position:relative;
}
.section.alt{
  background:linear-gradient(180deg, rgba(247,247,249,.7), rgba(255,255,255,.95));
  border-top:1px solid rgba(0,0,0,.05);
  border-bottom:1px solid rgba(0,0,0,.05);
}
.section-head{
  margin-bottom:28px;
}
.section-head h2{
  margin-top:14px;
  font-size: clamp(1.8rem, 3vw, 3rem);
}
.section-note{
  margin-top:14px;
  max-width: 90ch;
}

.card-grid{
  display:grid;
  gap:18px;
}
.card-grid.three{
  grid-template-columns:repeat(3, minmax(0, 1fr));
}
.card{
  background:rgba(255,255,255,.88);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow: 0 10px 30px rgba(0,0,0,.05);
  padding:22px;
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(135deg, rgba(0,0,0,.035), transparent 32%);
  pointer-events:none;
}
.card h3{
  font-size:1.2rem;
  margin-bottom:10px;
}
.card p{
  position:relative;
  z-index:1;
}
.card-badge{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:7px 11px;
  background:var(--black);
  color:var(--white);
  border-radius:999px;
  font-size:.82rem;
  font-weight:700;
  margin-bottom:14px;
}
.check-list{
  margin-top:14px;
}
.check-list li{
  margin:8px 0;
}
.feature-card{
  min-height:180px;
}

.steps{
  display:grid;
  grid-template-columns:repeat(4, minmax(0, 1fr));
  gap:18px;
}
.step{
  background:rgba(255,255,255,.88);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
  box-shadow: 0 10px 30px rgba(0,0,0,.05);
}
.step-num{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:46px;
  height:46px;
  border-radius:14px;
  background:var(--black);
  color:var(--white);
  font-weight:800;
  margin-bottom:14px;
}
.step h3{
  margin-bottom:10px;
  font-size:1.12rem;
}
.tip-box{
  margin-top:18px;
  border:1px solid var(--line-strong);
  background:rgba(255,255,255,.9);
  border-radius:18px;
  padding:16px 18px;
  color:#222;
}

.faq-list{
  display:grid;
  gap:14px;
}
.faq-item{
  background:rgba(255,255,255,.92);
  border:1px solid var(--line);
  border-radius:18px;
  overflow:hidden;
}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:18px 20px;
  background:transparent;
  border:0;
  cursor:pointer;
  font-size:1rem;
  font-weight:700;
  color:var(--text);
  text-align:left;
}
.faq-icon{
  display:inline-flex;
  width:30px;
  height:30px;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:var(--black);
  color:var(--white);
  flex-shrink:0;
  transition:transform .2s ease;
}
.faq-item.open .faq-icon{
  transform:rotate(45deg);
}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .28s ease;
  border-top:1px solid rgba(0,0,0,.06);
}
.faq-a p{
  padding:0 20px 18px;
}
.faq-item.open .faq-a{
  max-height:260px;
}

.cta-band{
  padding-top:20px;
}
.cta-inner{
  background:#0C0C0C;
  color:var(--white);
  border-radius:28px;
  padding:34px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  box-shadow: var(--shadow);
}
.cta-inner h2{
  color:var(--white);
  margin-top:10px;
}
.cta-inner p{
  color:rgba(255,255,255,.78);
  max-width: 66ch;
  margin-top:10px;
}
.cta-actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}
.cta-band .btn-light{
  background:transparent;
  color:var(--white);
  border-color:rgba(255,255,255,.24);
}
.cta-band .btn-light:hover{
  border-color:var(--white);
  background:rgba(255,255,255,.06);
}

.site-footer{
  padding:28px 0 42px;
}
.footer-inner{
  border-top:1px solid var(--line);
  padding-top:22px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  flex-wrap:wrap;
}
.footer-links{
  display:flex;
  gap:16px;
  flex-wrap:wrap;
}
.footer-links a{
  color:var(--muted);
}
.footer-links a:hover{
  color:var(--text);
}

section[id]{
  scroll-margin-top: 98px;
}

@media (max-width: 1080px){
  .hero-grid,
  .steps,
  .card-grid.three{
    grid-template-columns:1fr 1fr;
  }
  .cta-inner{
    flex-direction:column;
    align-items:flex-start;
  }
}
@media (max-width: 780px){
  .nav-wrap{
    position:relative;
  }
  .menu-toggle{
    display:inline-block;
  }
  .nav-links{
    position:absolute;
    top:calc(var(--header-h) - 2px);
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:flex-start;
    gap:14px;
    background:rgba(255,255,255,.98);
    border:1px solid rgba(0,0,0,.08);
    border-radius:0 0 22px 22px;
    padding:18px;
    box-shadow: 0 25px 35px rgba(0,0,0,.08);
  }
  .nav-links.open{
    display:flex;
  }
  .nav-actions{
    margin-left:0;
    width:100%;
    flex-wrap:wrap;
  }
  .nav-actions .btn{
    flex:1 1 180px;
  }
  .hero{
    padding-top:56px;
  }
  .hero-grid,
  .steps,
  .card-grid.three{
    grid-template-columns:1fr;
  }
  .hero h1{
    max-width: none;
  }
  .section{
    padding:58px 0;
  }
  .cta-inner{
    padding:26px;
  }
}

@media (max-width: 480px){
  .container{
    width:min(var(--container), calc(100% - 28px));
  }
  .brand{
    min-width:auto;
  }
  .hero-actions,
  .cta-actions{
    width:100%;
  }
  .hero-actions .btn,
  .cta-actions .btn{
    width:100%;
  }
  .faq-q{
    padding:16px;
    font-size:.98rem;
  }
  .faq-a p{
    padding:0 16px 16px;
  }
}