*,*::before,*::after{box-sizing:border-box;}
:root{
  --ink:#0e1a33;
  --ink-2:#2a3b60;
  --muted:#5a6b8c;
  --line:#e3eaf8;
  --brand:#2f5bff;
  --brand-2:#7b3ff2;
  --cyan:#00b6c9;
  --shadow-sm:0 1px 2px rgba(16,36,94,.05);
  --shadow-md:0 14px 32px rgba(20,44,110,.10);
}
html{scroll-behavior:smooth;scroll-padding-top:86px;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);
  line-height:1.72;
  background-color:#f4f7ff;
  background-image:
    radial-gradient(760px 480px at 10% -6%, rgba(47,91,255,.16), transparent 62%),
    radial-gradient(700px 460px at 94% 4%, rgba(123,63,242,.15), transparent 62%),
    radial-gradient(900px 620px at 46% 44%, rgba(0,182,201,.09), transparent 72%),
    linear-gradient(180deg,#f8fbff 0%,#f2f6ff 42%,#f7fffd 100%);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;}
a{color:var(--brand);text-decoration:none;}
h1,h2,h3{color:#0d1930;letter-spacing:-.01em;}
.container{width:100%;max-width:1160px;margin:0 auto;padding:0 20px;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.9);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:70px;}
.brand{display:flex;align-items:center;flex:0 0 auto;}
.brand .ai-page-logo{width:130px;height:auto;display:block;}
.nav{display:flex;align-items:center;gap:14px;}
.nav-links{display:flex;align-items:center;gap:0;list-style:none;margin:0;padding:0;}
.nav-links a{
  display:block;padding:9px 11px;font-size:15px;color:#33456e;border-radius:9px;
  transition:color .2s ease,background .2s ease;white-space:nowrap;
}
.nav-links a:hover{color:var(--brand);background:#eef3ff;}
.nav-cta{padding:9px 18px;font-size:14px;flex:0 0 auto;}
.nav-toggle{
  display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;
  background:#fff;cursor:pointer;padding:0;align-items:center;justify-content:center;flex-direction:column;gap:4px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:#2a3b60;border-radius:2px;transition:transform .25s ease,opacity .25s ease;}
.nav-toggle.active span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle.active span:nth-child(2){opacity:0;}
.nav-toggle.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 26px;border-radius:12px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;text-decoration:none;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s ease,border-color .2s ease;
}
.btn-primary{background:linear-gradient(135deg,#2f5bff,#7b3ff2);color:#fff;box-shadow:0 10px 24px rgba(47,91,255,.28);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(47,91,255,.36);color:#fff;}
.btn-primary:active{transform:translateY(0) scale(.985);}
.btn-ghost{background:#fff;color:#22315a;border-color:#d5e0f8;}
.btn-ghost:hover{border-color:#2f5bff;color:#2f5bff;box-shadow:0 8px 20px rgba(47,91,255,.13);}

/* ---------- Section base ---------- */
.section{padding:56px 0;}
.section--tint{background:rgba(255,255,255,.72);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:780px;margin:0 0 34px;}
.kicker{
  display:inline-flex;align-items:center;padding:5px 14px;border-radius:999px;
  background:#e8efff;color:#2b4fd8;font-size:13px;font-weight:700;letter-spacing:.05em;
}
.section-head h2{margin:14px 0 10px;font-size:clamp(23px,3vw,32px);line-height:1.32;}
.section-head p{margin:0;color:var(--muted);font-size:16px;}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:60px 0 52px;}
.hero-inner{display:grid;grid-template-columns:1.06fr .94fr;gap:46px;align-items:center;}
.eyebrow{
  display:inline-block;padding:6px 14px;border-radius:999px;font-size:13px;font-weight:700;
  color:#1f3fa8;background:linear-gradient(135deg,rgba(47,91,255,.12),rgba(123,63,242,.12));
  border:1px solid rgba(47,91,255,.18);
}
.hero h1{margin:18px 0 16px;font-size:clamp(30px,4.2vw,48px);line-height:1.22;letter-spacing:-.02em;}
.hero h1 em{font-style:normal;background:linear-gradient(120deg,#2f5bff,#7b3ff2 60%,#00b6c9);-webkit-background-clip:text;background-clip:text;color:#2f5bff;}
.hero-lead{margin:0 0 26px;color:#4d5f85;font-size:16.5px;max-width:560px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;list-style:none;margin:24px 0 0;padding:0;}
.hero-tags li{
  font-size:13px;color:#2b3f6b;padding:6px 13px;border-radius:999px;
  background:#fff;border:1px solid #dfe8fb;box-shadow:var(--shadow-sm);
}
.hero-visual{position:relative;z-index:1;}
.model-wall{
  position:relative;z-index:1;
  background:#fff;border:1px solid #e0e9ff;border-radius:22px;padding:20px;
  box-shadow:0 24px 60px rgba(21,45,110,.14);
}
.model-wall::before{
  content:"";position:absolute;inset:-16px;border-radius:30px;z-index:-1;
  background:linear-gradient(135deg,rgba(47,91,255,.22),rgba(123,63,242,.16),rgba(0,182,201,.16));
  filter:blur(26px);
}
.wall-head{display:flex;align-items:center;gap:7px;padding-bottom:14px;border-bottom:1px dashed #e5ecfa;margin-bottom:16px;}
.dot{width:9px;height:9px;border-radius:50%;display:block;}
.dot-a{background:#ff8f6b;}
.dot-b{background:#ffd166;}
.dot-c{background:#4fd1a5;}
.wall-title{margin-left:8px;font-size:13px;font-weight:700;color:#2a3b60;letter-spacing:.04em;}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;}
.chips li{
  padding:6px 12px;border-radius:999px;background:#f2f6ff;color:#33456e;
  font-size:13px;border:1px solid #e3ebff;transition:transform .2s ease,background .2s ease,color .2s ease;
}
.chips li:hover{transform:translateY(-2px);background:#e6eeff;color:#1f3fa8;}
.chips li.hot{background:linear-gradient(135deg,#2f5bff,#7b3ff2);color:#fff;border-color:transparent;}
.wall-foot{display:flex;flex-wrap:wrap;gap:16px;margin-top:18px;padding-top:14px;border-top:1px dashed #e5ecfa;}
.wall-foot span{font-size:13px;color:#4a5d85;position:relative;padding-left:14px;}
.wall-foot span::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:7px;height:7px;border-radius:50%;background:linear-gradient(135deg,#2f5bff,#00b6c9);
}
.float-badge{
  position:absolute;padding:8px 14px;border-radius:12px;font-size:13px;font-weight:700;
  background:#fff;color:#1f3fa8;border:1px solid #dfe8fb;box-shadow:0 12px 26px rgba(20,44,110,.14);
  animation:floaty 6s ease-in-out infinite;
}
.fb-1{top:-16px;right:-6px;}
.fb-2{bottom:-18px;left:-10px;animation-delay:1.6s;color:#6a2fd4;}
@keyframes floaty{0%,100%{transform:translateY(0);}50%{transform:translateY(-9px);}}

.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:46px;}
.stat{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;
  box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease;
}
.stat:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);}
.stat b{display:block;font-size:21px;color:#12234a;line-height:1.3;}
.stat span{font-size:13px;color:#5c6c8e;}

/* ---------- Cards / grids ---------- */
.grid{display:grid;gap:18px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
.card{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;
  box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#cfdcff;}
.card h3{margin:0 0 8px;font-size:17px;color:#12224a;}
.card p{margin:0;color:#59698c;font-size:14.5px;}
.card-icon{
  display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;
  border-radius:12px;margin-bottom:14px;font-size:15px;font-weight:700;color:#fff;
  background:linear-gradient(135deg,#2f5bff,#7b3ff2);letter-spacing:.02em;
}
.card-icon.alt{background:linear-gradient(135deg,#00b6c9,#2f5bff);}
.card-icon.warm{background:linear-gradient(135deg,#ff8f6b,#f45b8a);}

/* ---------- Chips cloud ---------- */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 0;padding:0;list-style:none;}
.tag-cloud li{
  padding:8px 15px;border-radius:999px;background:#fff;border:1px solid #e1e9fb;
  font-size:13.5px;color:#3a4d76;transition:transform .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.tag-cloud li:hover{transform:translateY(-2px);color:#1f3fa8;border-color:#b8ccff;box-shadow:0 8px 18px rgba(47,91,255,.12);}

/* ---------- Steps ---------- */
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease;}
.step:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.step-no{
  display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:12px;
  background:linear-gradient(135deg,#2f5bff,#7b3ff2);color:#fff;font-weight:700;font-size:16px;margin-bottom:14px;
}
.step h3{margin:0 0 8px;font-size:16.5px;}
.step p{margin:0;font-size:14.5px;color:#59698c;}

/* ---------- Cases ---------- */
.case-card{padding:0;overflow:hidden;}
.case-media{aspect-ratio:16/10;overflow:hidden;background:#eef3ff;}
.case-media.square{aspect-ratio:4/3;}
.case-media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .55s ease;}
.case-card:hover .case-media img{transform:scale(1.05);}
.case-body{padding:20px 22px 22px;}
.case-body h3{margin:0 0 8px;font-size:17px;}
.case-body p{margin:0;font-size:14.5px;color:#59698c;}

/* ---------- Compare ---------- */
.compare-top{display:grid;grid-template-columns:280px 1fr;gap:20px;margin-bottom:22px;align-items:stretch;}
.score-card{
  background:linear-gradient(150deg,#22305c,#3a2a86 55%,#2f5bff);
  border-radius:18px;padding:26px;color:#fff;text-align:center;
  box-shadow:0 20px 44px rgba(35,49,110,.28);
}
.score-card .stars{font-size:20px;letter-spacing:.16em;color:#ffd166;}
.score-card .score{margin:10px 0 4px;font-size:44px;font-weight:800;line-height:1;}
.score-card .score span{font-size:17px;font-weight:500;color:#c9d6ff;}
.score-card .score-label{font-size:13.5px;color:#c9d6ff;margin:0;}
.score-card .rec{margin-top:14px;font-size:14px;font-weight:700;color:#fff;background:rgba(255,255,255,.16);border-radius:10px;padding:8px 10px;}
.compare-note{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow-sm);}
.compare-note h3{margin:0 0 10px;font-size:17px;}
.compare-note p{margin:0 0 12px;color:#59698c;font-size:14.5px;}
.compare-note ul{margin:0;padding-left:18px;color:#4d5f85;font-size:14.5px;}
.compare-note li{margin-bottom:6px;}

.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:var(--shadow-sm);}
table{width:100%;border-collapse:collapse;min-width:680px;font-size:15px;}
thead th{background:#f4f8ff;color:#1a2a4f;font-weight:700;text-align:left;padding:15px 16px;border-bottom:1px solid #e8effb;}
tbody td{padding:14px 16px;border-bottom:1px solid #eef2fb;color:#4d5f85;}
tbody tr:last-child td{border-bottom:none;}
tbody tr:hover td{background:#fafcff;}
td.brand-col{color:#1f3fa8;font-weight:600;background:#f7faff;}

/* ---------- Token ---------- */
.token-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.price-note{margin-top:18px;font-size:13.5px;color:#6b7ba0;}

/* ---------- Reviews ---------- */
.review{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease;}
.review:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.review .quote{font-size:15px;color:#3c4d73;margin:0 0 16px;}
.review .who{display:flex;align-items:center;gap:12px;}
.avatar{
  width:38px;height:38px;border-radius:50%;flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:14px;
  background:linear-gradient(135deg,#2f5bff,#00b6c9);
}
.review .who b{display:block;font-size:14.5px;color:#12224a;}
.review .who span{display:block;font-size:12.5px;color:#7a89a8;}

/* ---------- Help / articles ---------- */
.article-list{list-style:none;margin:0;padding:0;display:grid;gap:12px;}
.article-list a{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:14px;
  color:#1a2a4f;font-size:15px;font-weight:600;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,color .2s ease;
}
.article-list a:hover{transform:translateX(4px);border-color:#b8ccff;color:#1f3fa8;box-shadow:0 10px 22px rgba(47,91,255,.12);}
.article-list a em{font-style:normal;font-size:13px;color:#8e9cba;font-weight:500;flex:0 0 auto;}

/* ---------- FAQ ---------- */
.faq-list{display:grid;gap:12px;}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease;}
.faq-item.open{border-color:#b8ccff;box-shadow:0 12px 26px rgba(47,91,255,.10);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:17px 20px;background:none;border:0;cursor:pointer;text-align:left;
  font-size:15.5px;font-weight:600;color:#13224a;font-family:inherit;line-height:1.5;
}
.faq-q .arrow{
  flex:0 0 auto;width:22px;height:22px;border-radius:50%;position:relative;
  background:#eef3ff;transition:transform .28s ease,background .2s ease;
}
.faq-q .arrow::before,.faq-q .arrow::after{
  content:"";position:absolute;top:50%;left:50%;background:#2f5bff;border-radius:2px;transform:translate(-50%,-50%);
}
.faq-q .arrow::before{width:10px;height:2px;}
.faq-q .arrow::after{width:2px;height:10px;transition:opacity .2s ease;}
.faq-item.open .faq-q .arrow{transform:rotate(180deg);background:#dfe8ff;}
.faq-item.open .faq-q .arrow::after{opacity:0;}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-a p{margin:0;padding:0 20px 18px;color:#55658a;font-size:14.5px;}
.faq-item.open .faq-a{max-height:340px;}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:start;}
.form-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow-md);}
.form-card h3{margin:0 0 6px;font-size:18px;}
.form-card .form-tip{margin:0 0 20px;font-size:14px;color:#6b7ba0;}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.field{display:flex;flex-direction:column;gap:6px;}
.field.full{grid-column:1 / -1;}
.field label{font-size:13.5px;font-weight:600;color:#22315a;}
.field input,.field select,.field textarea{
  font-family:inherit;font-size:15px;padding:12px 14px;border:1px solid #d9e2f6;border-radius:10px;
  background:#fbfdff;color:#12234a;transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;width:100%;
}
.field textarea{min-height:110px;resize:vertical;}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:#2f5bff;background:#fff;box-shadow:0 0 0 3px rgba(47,91,255,.14);
}
.form-submit{margin-top:20px;display:flex;flex-wrap:wrap;align-items:center;gap:14px;}
.form-submit .hint{font-size:13px;color:#7a89a8;margin:0;}
.contact-side{display:grid;gap:18px;}
.info-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow-sm);}
.info-card h3{margin:0 0 14px;font-size:16.5px;}
.info-list{list-style:none;margin:0;padding:0;display:grid;gap:11px;}
.info-list li{font-size:14.5px;color:#4d5f85;display:flex;gap:10px;align-items:flex-start;}
.info-list li b{flex:0 0 74px;color:#2a3b60;font-weight:600;}
.info-list li a{color:#1f3fa8;}
.qr{margin-top:14px;display:flex;align-items:center;gap:14px;padding-top:14px;border-top:1px dashed #e5ecfa;}
.qr img{width:104px;height:104px;object-fit:cover;border-radius:12px;border:1px solid var(--line);background:#f4f7ff;}
.qr p{margin:0;font-size:13px;color:#6b7ba0;line-height:1.6;}
.join-card{background:linear-gradient(150deg,#22305c,#3a2a86 60%,#2f5bff);border-radius:18px;padding:24px;color:#fff;box-shadow:0 18px 40px rgba(35,49,110,.26);}
.join-card h3{margin:0 0 10px;font-size:17px;color:#fff;}
.join-card p{margin:0 0 16px;font-size:14px;color:#cdd9ff;}
.join-card .btn-ghost{border-color:rgba(255,255,255,.4);background:rgba(255,255,255,.12);color:#fff;}
.join-card .btn-ghost:hover{border-color:#fff;color:#fff;box-shadow:none;background:rgba(255,255,255,.2);}

/* ---------- Footer ---------- */
.site-footer{background:#0e1a33;color:#b9c7e6;padding:44px 0 24px;margin-top:8px;}
.footer-top{display:grid;grid-template-columns:1.4fr .9fr .9fr;gap:32px;padding-bottom:28px;border-bottom:1px solid rgba(255,255,255,.12);}
.footer-brand .ai-page-logo{width:132px;height:auto;display:block;margin-bottom:14px;filter:brightness(0) invert(1);}
.footer-brand p{margin:0 0 10px;font-size:14px;color:#a7b6d8;max-width:420px;}
.footer-brand .footer-mail{font-size:14px;color:#cdd9ff;}
.footer-brand .footer-mail a{color:#ffffff;}
.site-footer h3{margin:0 0 14px;font-size:15px;color:#ffffff;}
.footer-links ul,.footer-nav ul{list-style:none;margin:0;padding:0;display:grid;gap:9px;}
.footer-links a,.footer-nav a{font-size:14px;color:#b9c7e6;transition:color .2s ease;}
.footer-links a:hover,.footer-nav a:hover{color:#ffffff;}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;padding-top:18px;}
.footer-bottom p{margin:0;font-size:13px;color:#8d9dc2;}
.footer-bottom a{color:#cdd9ff;}
.footer-bottom a:hover{color:#ffffff;}

/* ---------- Floating ---------- */
#backTop{
  position:fixed;right:20px;bottom:84px;z-index:70;width:44px;height:44px;border-radius:50%;
  border:1px solid var(--line);background:#fff;color:#23376b;font-size:16px;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .25s ease,transform .25s ease,visibility .25s ease,box-shadow .25s ease;
  box-shadow:var(--shadow-md);font-family:inherit;
}
#backTop.show{opacity:1;visibility:visible;transform:none;}
.float-service{
  position:fixed;right:20px;bottom:24px;z-index:70;padding:12px 20px;border-radius:999px;
  background:linear-gradient(135deg,#2f5bff,#7b3ff2);color:#fff;font-size:14px;font-weight:700;
  text-decoration:none;box-shadow:0 12px 26px rgba(47,91,255,.35);
  transition:transform .2s ease,box-shadow .2s ease;
}
.float-service:hover{transform:translateY(-3px);color:#fff;box-shadow:0 18px 34px rgba(47,91,255,.42);}

/* ---------- Reveal ---------- */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .62s ease,transform .62s ease;}
.js .reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion: reduce){
  .js .reveal{opacity:1;transform:none;transition:none;}
  html{scroll-behavior:auto;}
  .float-badge{animation:none;}
}

/* ---------- Responsive ---------- */
@media (max-width: 1020px){
  .nav-cta{display:none;}
  .nav-links a{padding:9px 9px;font-size:14.5px;}
}
@media (max-width: 900px){
  .nav-toggle{display:flex;}
  .nav{
    position:absolute;left:0;right:0;top:70px;z-index:80;
    flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);
    box-shadow:0 24px 44px rgba(16,36,94,.14);
    max-height:0;overflow:hidden;transition:max-height .3s ease;
    padding:0 20px;
  }
  .nav.open{max-height:560px;padding:10px 20px 18px;}
  .nav-links{flex-direction:column;align-items:stretch;gap:0;}
  .nav-links a{padding:13px 4px;border-bottom:1px solid #eef2fb;font-size:15px;border-radius:0;}
  .hero-inner{grid-template-columns:1fr;gap:34px;}
  .float-badge{display:none;}
  .hero-stats{grid-template-columns:repeat(2,1fr);}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .token-grid{grid-template-columns:repeat(2,1fr);}
  .compare-top{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:1fr 1fr;}
  .footer-brand{grid-column:1 / -1;}
}
@media (max-width: 640px){
  .section{padding:44px 0;}
  .hero{padding:44px 0 40px;}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}
  .token-grid{grid-template-columns:1fr;}
  .hero-stats{grid-template-columns:1fr 1fr;gap:12px;}
  .form-grid{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:1fr;}
  .brand .ai-page-logo{width:112px;}
  .hero-actions .btn{flex:1 1 auto;}
  .float-service{padding:10px 16px;font-size:13px;}
  #backTop{right:16px;bottom:76px;}
  .float-service{right:16px;}}