:root{
  --ink:#151a2d;
  --ink-soft:#3c4358;
  --ink-muted:#6a7288;
  --line:#e3e6f0;
  --bg:#f6f7fc;
  --bg-alt:#eef1fa;
  --card:#ffffff;
  --brand:#5b4bff;
  --brand-2:#9a4bff;
  --brand-3:#00c2b8;
  --brand-4:#ff7ac2;
  --brand-5:#ffb648;
  --radius:18px;
  --radius-sm:12px;
  --shadow-sm:0 2px 10px rgba(30,36,80,.06);
  --shadow-md:0 10px 30px rgba(40,50,120,.10);
  --shadow-lg:0 20px 50px rgba(50,40,140,.16);
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(122,86,255,.16), transparent 60%),
    radial-gradient(900px 520px at 92% 4%, rgba(0,194,184,.14), transparent 62%),
    radial-gradient(800px 700px at 50% 42%, rgba(255,122,194,.08), transparent 70%),
    linear-gradient(180deg,#f8f9ff 0%,#f1f3fc 40%,#f6f7fc 100%);
  background-attachment:fixed;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;text-decoration:none;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 22px;
}
section{position:relative;}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:80;
  backdrop-filter:blur(14px);
  background:rgba(250,251,255,.82);
  border-bottom:1px solid rgba(120,130,190,.16);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  gap:18px;padding:12px 0;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand .ai-page-logo{width:auto;height:36px;max-width:100%;}
.brand-name{font-size:17px;font-weight:800;letter-spacing:.5px;color:var(--ink);white-space:nowrap;}
.nav-links{
  display:flex;align-items:center;gap:0;
  flex-wrap:wrap;
}
.nav-links a{
  font-size:14px;color:var(--ink-soft);font-weight:600;
  padding:8px 11px;border-radius:10px;
  transition:color .25s,background .25s;
  white-space:nowrap;
}
.nav-links a:hover{color:var(--brand);background:rgba(91,75,255,.08);}
.nav-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font);font-size:14px;font-weight:700;
  padding:11px 22px;border-radius:999px;border:1px solid transparent;
  cursor:pointer;transition:transform .22s,box-shadow .22s,background .22s,color .22s;
  text-align:center;
}
.btn:active{transform:translateY(1px) scale(.99);}
.btn-primary{
  color:#fff;
  background:linear-gradient(120deg,var(--brand) 0%,var(--brand-2) 55%,var(--brand-4) 100%);
  box-shadow:0 8px 22px rgba(91,75,255,.32);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(91,75,255,.42);}
.btn-ghost{
  color:var(--ink);
  background:#fff;border-color:var(--line);
  box-shadow:var(--shadow-sm);
}
.btn-ghost:hover{transform:translateY(-2px);border-color:rgba(91,75,255,.4);color:var(--brand);box-shadow:0 10px 24px rgba(91,75,255,.16);}
.btn-lg{padding:14px 30px;font-size:15px;}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line);background:#fff;cursor:pointer;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;transition:transform .3s,opacity .3s;}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ===== hero ===== */
.hero{padding:56px 0 44px;}
.hero-grid{
  display:grid;grid-template-columns:1.15fr .85fr;gap:38px;align-items:center;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;font-weight:700;letter-spacing:1px;
  color:#4a3cd6;
  background:linear-gradient(90deg,rgba(91,75,255,.12),rgba(0,194,184,.14));
  border:1px solid rgba(91,75,255,.2);
  padding:7px 16px;border-radius:999px;margin-bottom:20px;
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-3));animation:pulse 2.4s infinite;}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1);}50%{opacity:.45;transform:scale(.75);}}
.hero h1{
  font-size:clamp(30px,4.2vw,50px);
  line-height:1.22;font-weight:900;letter-spacing:-.5px;
  color:var(--ink);
}
.hero h1 .grad{
  background:linear-gradient(100deg,var(--brand) 0%,var(--brand-2) 40%,var(--brand-3) 78%,var(--brand-5) 100%);
  -webkit-background-clip:text;background-clip:text;
  color:#4a3cd6;
  -webkit-text-fill-color:transparent;
}
.hero-desc{
  margin-top:20px;font-size:16px;color:var(--ink-soft);max-width:560px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px;}
.hero-note{margin-top:16px;font-size:13px;color:var(--ink-muted);}
.hero-note strong{color:var(--brand);}
.hero-panel{
  position:relative;
  border-radius:24px;
  padding:26px;
  background:linear-gradient(160deg,#ffffff 0%,#f4f2ff 46%,#eefaff 100%);
  border:1px solid rgba(120,130,200,.2);
  box-shadow:var(--shadow-lg);
  overflow:hidden;
}
.hero-panel::before{
  content:"";position:absolute;inset:-40% -10% auto auto;width:320px;height:320px;
  background:radial-gradient(circle,rgba(154,75,255,.22),transparent 68%);
  animation:floatGlow 9s ease-in-out infinite alternate;
}
.hero-panel::after{
  content:"";position:absolute;inset:auto auto -50% -20%;width:300px;height:300px;
  background:radial-gradient(circle,rgba(0,194,184,.18),transparent 68%);
  animation:floatGlow 11s ease-in-out infinite alternate-reverse;
}
@keyframes floatGlow{from{transform:translate3d(0,0,0);}to{transform:translate3d(-24px,20px,0);}}
.panel-head{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
.panel-head h3{font-size:15px;font-weight:800;color:var(--ink);}
.panel-head span{font-size:12px;font-weight:700;color:#fff;background:linear-gradient(120deg,var(--brand),var(--brand-3));padding:4px 12px;border-radius:999px;}
.metrics{position:relative;z-index:1;display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.metric{
  background:rgba(255,255,255,.86);
  border:1px solid rgba(120,130,200,.18);
  border-radius:var(--radius-sm);
  padding:14px 14px 12px;
  transition:transform .25s,box-shadow .25s;
}
.metric:hover{transform:translateY(-3px);box-shadow:0 10px 22px rgba(80,70,180,.14);}
.metric-num{
  font-size:22px;font-weight:900;letter-spacing:-.5px;
  background:linear-gradient(100deg,var(--brand),var(--brand-2));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.metric-label{font-size:12.5px;color:var(--ink-muted);margin-top:2px;}
.panel-tags{position:relative;z-index:1;display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.panel-tags span{
  font-size:12px;font-weight:600;color:#413a8f;
  background:rgba(91,75,255,.09);
  border:1px solid rgba(91,75,255,.16);
  padding:5px 11px;border-radius:999px;
}

/* ===== section shell ===== */
.sec{padding:64px 0;}
.sec-head{max-width:760px;margin-bottom:36px;}
.sec-tag{
  display:inline-block;font-size:12.5px;font-weight:800;letter-spacing:1.4px;
  color:var(--brand);text-transform:uppercase;margin-bottom:12px;
}
.sec-head h2{
  font-size:clamp(24px,3vw,34px);line-height:1.3;font-weight:900;color:var(--ink);letter-spacing:-.4px;
}
.sec-head p{margin-top:12px;color:var(--ink-soft);font-size:15px;}
.center{text-align:center;margin-left:auto;margin-right:auto;}

/* ===== about / intro ===== */
.about-wrap{
  display:grid;grid-template-columns:1.05fr .95fr;gap:34px;align-items:start;
}
.about-card{
  background:linear-gradient(165deg,#ffffff,#f3f2ff 60%,#eefbff);
  border:1px solid rgba(120,130,200,.2);
  border-radius:var(--radius);
  padding:30px;
  box-shadow:var(--shadow-md);
}
.about-card h3{font-size:19px;font-weight:800;margin-bottom:14px;color:var(--ink);}
.about-card p{color:var(--ink-soft);font-size:14.5px;margin-bottom:12px;}
.about-card p:last-child{margin-bottom:0;}
.about-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:20px;}
.about-item{
  display:flex;align-items:flex-start;gap:9px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:11px 13px;font-size:13.5px;font-weight:600;color:var(--ink-soft);
  transition:transform .22s,border-color .22s;
}
.about-item:hover{transform:translateY(-2px);border-color:rgba(91,75,255,.32);}
.about-item i{
  font-style:normal;width:18px;height:18px;border-radius:6px;flex-shrink:0;
  background:linear-gradient(135deg,var(--brand),var(--brand-3));
  color:#fff;font-size:11px;font-weight:900;display:flex;align-items:center;justify-content:center;margin-top:2px;
}
.plat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.plat-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:16px 16px 14px;box-shadow:var(--shadow-sm);
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.plat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(91,75,255,.3);}
.plat-card h4{font-size:14.5px;font-weight:800;color:var(--ink);margin-bottom:6px;}
.plat-card p{font-size:12.8px;color:var(--ink-muted);line-height:1.6;}

/* ===== service cards ===== */
.svc-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;
}
.svc-card{
  position:relative;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px 22px;
  box-shadow:var(--shadow-sm);
  transition:transform .28s,box-shadow .28s,border-color .28s;
  overflow:hidden;
}
.svc-card::after{
  content:"";position:absolute;left:0;top:0;height:3px;width:0;
  background:linear-gradient(90deg,var(--brand),var(--brand-4));
  transition:width .35s ease;
}
.svc-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:rgba(91,75,255,.24);}
.svc-card:hover::after{width:100%;}
.svc-ico{
  width:44px;height:44px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  font-size:19px;font-weight:900;color:#fff;margin-bottom:14px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:0 8px 18px rgba(91,75,255,.26);
}
.svc-card:nth-child(3n+2) .svc-ico{background:linear-gradient(135deg,#00b3ab,#00c2b8);box-shadow:0 8px 18px rgba(0,194,184,.28);}
.svc-card:nth-child(3n) .svc-ico{background:linear-gradient(135deg,#ff6fb5,#ff9a5b);box-shadow:0 8px 18px rgba(255,122,194,.28);}
.svc-card h3{font-size:16px;font-weight:800;color:var(--ink);margin-bottom:8px;}
.svc-card p{font-size:13.5px;color:var(--ink-muted);line-height:1.68;}

/* ===== scenario chips ===== */
.chips{display:flex;flex-wrap:wrap;gap:10px;}
.chip{
  font-size:13px;font-weight:600;color:#3d3a7a;
  background:rgba(255,255,255,.9);
  border:1px solid rgba(120,130,200,.26);
  padding:8px 15px;border-radius:999px;
  transition:transform .22s,background .22s,color .22s,border-color .22s;
}
.chip:hover{transform:translateY(-2px);background:linear-gradient(120deg,var(--brand),var(--brand-2));color:#fff;border-color:transparent;}

/* ===== timeline ===== */
.timeline{position:relative;padding-left:26px;}
.timeline::before{
  content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--brand),var(--brand-3),var(--brand-4));
  border-radius:2px;opacity:.6;
}
.tl-item{position:relative;padding:0 0 26px 8px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-26px;top:6px;width:14px;height:14px;border-radius:50%;
  background:#fff;border:3px solid var(--brand);box-shadow:0 0 0 4px rgba(91,75,255,.12);
}
.tl-item:nth-child(2)::before{border-color:var(--brand-3);box-shadow:0 0 0 4px rgba(0,194,184,.14);}
.tl-item:nth-child(3)::before{border-color:var(--brand-2);box-shadow:0 0 0 4px rgba(154,75,255,.14);}
.tl-item:nth-child(4)::before{border-color:var(--brand-5);box-shadow:0 0 0 4px rgba(255,182,72,.16);}
.tl-item:nth-child(5)::before{border-color:var(--brand-4);box-shadow:0 0 0 4px rgba(255,122,194,.16);}
.tl-item h4{font-size:15px;font-weight:800;color:var(--ink);margin-bottom:5px;}
.tl-item p{font-size:13.5px;color:var(--ink-muted);line-height:1.65;}

/* ===== cases ===== */
.case-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:18px;align-items:start;}
.case-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-sm);
  transition:transform .28s,box-shadow .28s;
}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);}
.case-media{position:relative;background:linear-gradient(140deg,#f1efff,#eafbfb);overflow:hidden;}
.case-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.case-card:hover .case-media img{transform:scale(1.04);}
.case-body{padding:18px 18px 20px;}
.case-body h4{font-size:15.5px;font-weight:800;color:var(--ink);margin-bottom:7px;}
.case-body p{font-size:13px;color:var(--ink-muted);line-height:1.65;}
.case-tag{display:inline-block;margin-bottom:9px;font-size:11.5px;font-weight:800;letter-spacing:.6px;color:#4a3cd6;background:rgba(91,75,255,.1);padding:3px 10px;border-radius:999px;}

/* ===== comparison ===== */
.cmp-shell{
  background:linear-gradient(160deg,#ffffff,#f5f4ff 55%,#effbff);
  border:1px solid rgba(120,130,200,.22);
  border-radius:var(--radius);
  box-shadow:var(--shadow-md);
  overflow:hidden;
}
.cmp-top{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;
  padding:24px 26px;border-bottom:1px solid rgba(120,130,200,.18);
}
.cmp-score{display:flex;align-items:baseline;gap:8px;}
.cmp-score strong{
  font-size:40px;font-weight:900;letter-spacing:-1px;
  background:linear-gradient(100deg,var(--brand),var(--brand-2),var(--brand-3));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.cmp-score span{font-size:14px;color:var(--ink-muted);font-weight:700;}
.stars{font-size:19px;letter-spacing:3px;color:#ffb648;}
.cmp-badge{font-size:13px;font-weight:800;color:#3d3a8f;background:rgba(91,75,255,.1);border:1px solid rgba(91,75,255,.22);padding:7px 15px;border-radius:999px;}
.table-scroll{overflow-x:auto;}
table.cmp{width:100%;border-collapse:collapse;font-size:13.8px;min-width:660px;}
table.cmp th,table.cmp td{padding:14px 18px;text-align:left;border-bottom:1px solid rgba(120,130,200,.14);vertical-align:top;}
table.cmp thead th{
  font-size:13px;font-weight:800;color:var(--ink);background:rgba(91,75,255,.06);white-space:nowrap;
}
table.cmp tbody tr:last-child td{border-bottom:none;}
table.cmp tbody tr{transition:background .22s;}
table.cmp tbody tr:hover{background:rgba(91,75,255,.045);}
table.cmp td:first-child{font-weight:700;color:var(--ink);white-space:nowrap;}
.rate-up{color:#0b9c78;font-weight:800;}
.rate-mid{color:#b57a00;font-weight:700;}
.rate-low{color:#8b8fa6;font-weight:600;}

/* ===== reviews ===== */
.rev-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.rev-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 20px;box-shadow:var(--shadow-sm);
  display:flex;flex-direction:column;gap:12px;
  transition:transform .26s,box-shadow .26s;
}
.rev-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.rev-stars{font-size:14px;letter-spacing:2px;color:#ffb648;}
.rev-text{font-size:13.8px;color:var(--ink-soft);line-height:1.72;}
.rev-user{display:flex;align-items:center;gap:11px;margin-top:auto;padding-top:6px;}
.rev-avatar{
  width:38px;height:38px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:900;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
}
.rev-card:nth-child(2) .rev-avatar{background:linear-gradient(135deg,#00b3ab,#00c2b8);}
.rev-card:nth-child(3) .rev-avatar{background:linear-gradient(135deg,#ff6fb5,#ff9a5b);}
.rev-card:nth-child(4) .rev-avatar{background:linear-gradient(135deg,#5b4bff,#00c2b8);}
.rev-card:nth-child(5) .rev-avatar{background:linear-gradient(135deg,#ff9a5b,#ffb648);}
.rev-card:nth-child(6) .rev-avatar{background:linear-gradient(135deg,#9a4bff,#ff7ac2);}
.rev-name{font-size:13.5px;font-weight:800;color:var(--ink);}
.rev-role{font-size:12px;color:var(--ink-muted);}

/* ===== token / price ===== */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.price-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;box-shadow:var(--shadow-sm);position:relative;
  transition:transform .26s,box-shadow .26s,border-color .26s;
}
.price-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:rgba(91,75,255,.26);}
.price-card.hot{border-color:rgba(91,75,255,.4);box-shadow:0 16px 38px rgba(91,75,255,.16);}
.price-card.hot::before{
  content:"推荐";position:absolute;top:-1px;right:18px;
  font-size:11.5px;font-weight:800;color:#fff;letter-spacing:1px;
  background:linear-gradient(120deg,var(--brand),var(--brand-4));
  padding:4px 13px;border-radius:0 0 10px 10px;
}
.price-card h4{font-size:15.5px;font-weight:800;color:var(--ink);margin-bottom:6px;}
.price-sub{font-size:12.5px;color:var(--ink-muted);margin-bottom:16px;}
.price-num{font-size:30px;font-weight:900;letter-spacing:-.8px;color:var(--ink);}
.price-num small{font-size:13px;font-weight:700;color:var(--ink-muted);margin-left:4px;}
.price-list{margin-top:16px;display:flex;flex-direction:column;gap:9px;}
.price-list li{font-size:13px;color:var(--ink-soft);display:flex;gap:8px;align-items:flex-start;}
.price-list li::before{content:"✓";color:var(--brand-3);font-weight:900;flex-shrink:0;}

/* ===== articles ===== */
.art-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.art-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:20px;box-shadow:var(--shadow-sm);
  transition:transform .24s,box-shadow .24s,border-color .24s;
  display:flex;flex-direction:column;gap:8px;
}
.art-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(91,75,255,.26);}
.art-date{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:.6px;}
.art-card h4{font-size:14.8px;font-weight:800;color:var(--ink);line-height:1.5;}
.art-card p{font-size:12.8px;color:var(--ink-muted);line-height:1.65;}
.art-more{font-size:13px;font-weight:800;color:var(--brand);margin-top:auto;padding-top:6px;}
.art-links{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px;justify-content:center;}
.art-links a{
  font-size:12.8px;font-weight:700;color:var(--ink-soft);
  background:#fff;border:1px solid var(--line);padding:8px 15px;border-radius:999px;
  transition:color .22s,border-color .22s,transform .22s;
}
.art-links a:hover{color:var(--brand);border-color:rgba(91,75,255,.4);transform:translateY(-2px);}

/* ===== faq ===== */
.faq-list{display:flex;flex-direction:column;gap:12px;max-width:900px;margin:0 auto;}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  box-shadow:var(--shadow-sm);overflow:hidden;
  transition:border-color .24s,box-shadow .24s;
}
.faq-item.open{border-color:rgba(91,75,255,.32);box-shadow:0 12px 28px rgba(91,75,255,.12);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:17px 20px;background:none;border:none;cursor:pointer;text-align:left;
  font-family:var(--font);font-size:14.8px;font-weight:800;color:var(--ink);
}
.faq-q:hover{color:var(--brand);}
.faq-ico{
  width:24px;height:24px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(91,75,255,.1);color:var(--brand);font-size:15px;font-weight:900;
  transition:transform .3s,background .3s;
}
.faq-item.open .faq-ico{transform:rotate(45deg);background:linear-gradient(120deg,var(--brand),var(--brand-2));color:#fff;}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.faq-a p{padding:0 20px 18px;font-size:13.6px;color:var(--ink-muted);line-height:1.75;}

/* ===== form ===== */
.form-shell{
  display:grid;grid-template-columns:.95fr 1.05fr;gap:30px;
  background:linear-gradient(160deg,#ffffff,#f4f3ff 50%,#eefbfb);
  border:1px solid rgba(120,130,200,.22);
  border-radius:var(--radius);
  padding:32px;
  box-shadow:var(--shadow-md);
}
.form-info h3{font-size:21px;font-weight:900;color:var(--ink);margin-bottom:12px;}
.form-info p{font-size:14px;color:var(--ink-soft);margin-bottom:18px;}
.contact-list{display:flex;flex-direction:column;gap:11px;}
.contact-line{display:flex;gap:10px;align-items:flex-start;font-size:13.6px;color:var(--ink-soft);}
.contact-line b{color:var(--ink);font-weight:800;flex-shrink:0;}
.qr-box{
  margin-top:18px;display:flex;align-items:center;gap:14px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:13px;
}
.qr-box img{width:96px;height:96px;object-fit:contain;border-radius:8px;background:#f5f6fb;}
.qr-box div{font-size:12.8px;color:var(--ink-muted);line-height:1.7;}
.qr-box strong{display:block;font-size:13.5px;color:var(--ink);margin-bottom:3px;}
form.req-form{display:flex;flex-direction:column;gap:14px;}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.field{display:flex;flex-direction:column;gap:6px;}
.field label{font-size:13px;font-weight:700;color:var(--ink-soft);}
.field input,.field select,.field textarea{
  font-family:var(--font);font-size:14px;color:var(--ink);
  background:#fff;border:1px solid var(--line);border-radius:10px;
  padding:11px 14px;outline:none;transition:border-color .22s,box-shadow .22s;
  width:100%;
}
.field textarea{resize:vertical;min-height:96px;}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:rgba(91,75,255,.5);box-shadow:0 0 0 3px rgba(91,75,255,.12);
}
.form-msg{font-size:13px;color:#0b9c78;font-weight:700;min-height:18px;}

/* ===== footer ===== */
.site-footer{
  margin-top:16px;
  background:linear-gradient(165deg,#1a1c33,#232048 60%,#2a2350);
  color:#cfd3e8;
  padding:48px 0 0;
}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:28px;padding-bottom:34px;}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:12px;}
.foot-brand .ai-page-logo{height:34px;width:auto;}
.foot-brand span{font-size:16px;font-weight:800;color:#fff;}
.site-footer p{font-size:13px;color:#b3b8d4;line-height:1.75;}
.foot-col h4{font-size:14px;font-weight:800;color:#fff;margin-bottom:14px;letter-spacing:.4px;}
.foot-col ul{display:flex;flex-direction:column;gap:9px;}
.foot-col a,.foot-col li{font-size:13px;color:#b3b8d4;transition:color .22s;}
.foot-col a:hover{color:#a9b4ff;}
.friend-links{display:flex;flex-wrap:wrap;gap:8px;}
.friend-links a{
  font-size:12.5px;color:#c3c8e6;background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.12);padding:6px 12px;border-radius:999px;
  transition:background .22s,color .22s;
}
.friend-links a:hover{background:rgba(169,180,255,.2);color:#fff;}
.foot-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  padding:18px 0;display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;
}
.foot-bottom p{font-size:12.5px;color:#9aa0c0;}
.foot-bottom .home-link{color:#a9b4ff;font-weight:700;}

/* ===== floating ===== */
.float-wrap{position:fixed;right:18px;bottom:22px;z-index:100;display:flex;flex-direction:column;gap:10px;align-items:flex-end;}
.float-btn{
  width:50px;height:50px;border-radius:50%;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;font-size:20px;font-weight:900;
  box-shadow:0 10px 26px rgba(91,75,255,.4);
  transition:transform .24s,box-shadow .24s;
}
.float-btn:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 16px 34px rgba(91,75,255,.5);}
.float-top{background:#fff;color:var(--brand);border:1px solid var(--line);box-shadow:var(--shadow-md);font-size:16px;}
.kefu-pop{
  position:fixed;right:18px;bottom:84px;z-index:101;
  width:230px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  box-shadow:var(--shadow-lg);padding:16px;text-align:center;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .26s,transform .26s,visibility .26s;
}
.kefu-pop.show{opacity:1;visibility:visible;transform:translateY(0);}
.kefu-pop img{width:150px;height:150px;object-fit:contain;margin:0 auto 10px;border-radius:10px;background:#f5f6fb;}
.kefu-pop h4{font-size:13.5px;font-weight:800;color:var(--ink);margin-bottom:4px;}
.kefu-pop p{font-size:12px;color:var(--ink-muted);line-height:1.6;}

/* ===== reveal anim ===== */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1);}
.reveal.in{opacity:1;transform:none;}

/* ===== responsive ===== */
@media (max-width:1024px){
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;
    background:rgba(250,251,255,.98);border-bottom:1px solid var(--line);box-shadow:var(--shadow-md);
    padding:10px 22px 16px;}
  .nav-links.open{display:flex;}
  .nav-links a{padding:11px 8px;border-radius:8px;}
  .nav-toggle{display:flex;}
  .nav-wrap{position:relative;}
  .hero-grid{grid-template-columns:1fr;gap:26px;}
  .about-wrap{grid-template-columns:1fr;}
  .svc-grid{grid-template-columns:repeat(2,1fr);}
  .case-grid{grid-template-columns:1fr 1fr;}
  .case-card:first-child{grid-column:1 / -1;}
  .rev-grid{grid-template-columns:repeat(2,1fr);}
  .price-grid{grid-template-columns:1fr 1fr;}
  .art-grid{grid-template-columns:1fr 1fr;}
  .form-shell{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  .container{padding:0 16px;}
  .hero{padding:38px 0 30px;}
  .sec{padding:46px 0;}
  .hero-actions{flex-direction:column;align-items:stretch;}
  .hero-actions .btn{width:100%;}
  .svc-grid,.rev-grid,.price-grid,.art-grid{grid-template-columns:1fr;}
  .case-grid{grid-template-columns:1fr;}
  .case-card:first-child{grid-column:auto;}
  .about-list{grid-template-columns:1fr;}
  .plat-grid{grid-template-columns:1fr;}
  .f-row{grid-template-columns:1fr;}
  .form-shell{padding:22px 18px;}
  .foot-grid{grid-template-columns:1fr;gap:22px;}
  .cmp-top{padding:20px 18px;}
  .cmp-score strong{font-size:32px;}
  .float-wrap{right:12px;bottom:16px;}
  .kefu-pop{right:12px;width:210px;}
  .metrics{grid-template-columns:1fr 1fr;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  .reveal{opacity:1;transform:none;}
}