:root{
  --bg:#f5f7fb;
  --ink:#0b1220;
  --muted:#5b6577;
  --line:#e3e8f0;
  --card:#ffffff;
  --brand:#1d4ed8;
  --brand-2:#7c3aed;
  --soft:#eef4ff;
  --ok:#047857;
  --warn:#b45309;
  --shadow:0 12px 34px rgba(15,23,42,.08);
  --radius:18px;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.muted{color:var(--muted)}
.small{font-size:13px}
.tiny{font-size:12px}

/* Header */
.header{
  position:sticky;top:0;z-index:30;
  background:rgba(245,247,251,.88);backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(227,232,240,.9);
}
.header-in{display:flex;align-items:center;justify-content:space-between;height:68px;gap:18px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:.2px}
.logo-mark{
  width:32px;height:32px;border-radius:9px;display:grid;place-items:center;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));font-size:15px;font-weight:900;
}
.logo-img{
  width:38px;height:38px;object-fit:contain;border-radius:10px;background:#fff;padding:2px;
  box-shadow:0 2px 8px rgba(15,23,42,.10);
}
.nav{display:flex;align-items:center;gap:22px;font-size:14px;color:var(--muted)}
.nav a:hover{color:var(--ink)}
.header-cta{display:flex;align-items:center;gap:10px}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:12px;padding:11px 18px;font-weight:800;font-size:14px;border:1px solid transparent;
  cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--brand),#1e40af);color:#fff;box-shadow:0 8px 22px rgba(29,78,216,.26)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-soft{background:var(--soft);color:var(--brand)}
.btn-lg{padding:14px 24px;font-size:16px;border-radius:14px}
.btn-sm{padding:8px 12px;font-size:12px;border-radius:9px}

/* Hero */
.hero{position:relative;overflow:hidden;padding:72px 0 60px}
.hero:before,.hero:after{content:"";position:absolute;border-radius:50%;filter:blur(10px);pointer-events:none}
.hero:before{width:620px;height:620px;right:-200px;top:-260px;background:radial-gradient(circle,rgba(29,78,216,.18),transparent 65%)}
.hero:after{width:560px;height:560px;left:-240px;bottom:-300px;background:radial-gradient(circle,rgba(124,58,237,.14),transparent 65%)}
.hero-in{position:relative;z-index:1;display:grid;grid-template-columns:1.14fr .86fr;gap:46px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:800;color:var(--brand);background:var(--soft);border:1px solid rgba(29,78,216,.15);padding:7px 12px;border-radius:999px}
.dot{width:6px;height:6px;border-radius:50%;background:var(--ok);display:inline-block}
h1{font-size:52px;line-height:1.1;letter-spacing:-1.4px;margin:18px 0 16px}
.grad{background:linear-gradient(120deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:17px;color:var(--muted);margin:0 0 26px;max-width:640px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.trust{display:flex;gap:18px;flex-wrap:wrap;margin-top:20px;color:var(--muted);font-size:13px}
.trust span{display:inline-flex;align-items:center;gap:6px}

/* Quick price card */
.hero-card{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:22px}
.hero-card h3{margin:0 0 4px;font-size:15px}
.hero-card .sub{color:var(--muted);font-size:12px;margin-bottom:14px}
.quick-row{display:grid;grid-template-columns:1fr auto;gap:10px;padding:11px 0;border-top:1px solid var(--line);align-items:center}
.quick-row:first-of-type{border-top:0}
.quick-name{font-weight:800;font-size:13px}
.quick-desc{color:var(--muted);font-size:11px}
.quick-price{text-align:right}
.quick-price .our{font-weight:900;color:var(--ok);font-size:13px}
.quick-price .off{color:var(--muted);font-size:11px;text-decoration:line-through}
.tag{font-size:11px;font-weight:800;color:var(--brand);background:var(--soft);border-radius:999px;padding:3px 8px;display:inline-block}
.tag.ok{color:var(--ok);background:#ecfdf5}

/* Sections */
.section{padding:62px 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:26px}
.section-head h2{font-size:32px;letter-spacing:-.6px;margin:0}
.section-head p{color:var(--muted);margin:6px 0 0;font-size:15px}
.section-head a{white-space:nowrap}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 4px 16px rgba(15,23,42,.04)}
.card h3{margin:0 0 8px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:14px}
.icon{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:var(--soft);color:var(--brand);margin-bottom:14px;font-weight:900}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}

/* Pricing table */
.pricing-card{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);overflow:hidden}
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;min-width:820px}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:14px;vertical-align:top}
th{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:#fbfcff;font-weight:900}
tr:last-child td{border-bottom:0}
.model-cell strong{display:block;font-size:14px}
.model-cell span{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.price{font-weight:900}
.price small{font-weight:500;color:var(--muted)}
.mult{font-weight:900;color:var(--ok)}
.note{display:flex;gap:8px;align-items:flex-start;padding:14px 18px;background:#fffaf0;color:#8a5a13;font-size:12px;border-top:1px solid #f2e3c2}
.note.info{background:#eff6ff;color:#1e3a8a;border-top-color:#dbeafe}

/* Tier cards */
.tiers{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:22px}
.tier{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.tier h3{margin:0 0 4px;font-size:17px}
.tier .ratio{font-size:28px;font-weight:900;color:var(--brand);margin:6px 0}
.tier p{margin:0;color:var(--muted);font-size:13px}
.tier ul{margin:10px 0 0;padding-left:18px;color:var(--muted);font-size:13px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;counter-reset:step}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.step:before{counter-increment:step;content:counter(step);position:absolute;right:18px;top:14px;font-size:38px;font-weight:900;color:#eef2ff}
.step h3{position:relative;margin:0 0 8px;font-size:16px}
.step p{position:relative;margin:0;color:var(--muted);font-size:14px}

/* Guide */
.guide-step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:16px}
.guide-step h2{margin:0 0 8px;font-size:22px;letter-spacing:-.3px}
.guide-step h3{margin:18px 0 8px;font-size:16px}
.guide-step p,.guide-step li{color:var(--muted);font-size:14px}
.guide-step ol,.guide-step ul{margin:8px 0 0;padding-left:20px}
.guide-step li{margin:6px 0}
.code{background:#0b1220;color:#dbeafe;border-radius:12px;padding:16px 18px;overflow-x:auto;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:13px;line-height:1.7;margin:12px 0}
.code .k{color:#93c5fd}
.code .s{color:#86efac}
.kv{display:grid;grid-template-columns:160px 1fr;gap:8px 14px;font-size:14px;margin:10px 0}
.kv div:nth-child(odd){color:var(--muted);font-weight:700}
.kv div:nth-child(even){font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;word-break:break-all}

/* FAQ */
.faq{display:grid;gap:10px}
details{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:0 18px}
summary{cursor:pointer;font-weight:800;padding:16px 0;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";color:var(--brand);font-size:20px;line-height:1}
details[open] summary:after{content:"−"}
details p{margin:0 0 16px;color:var(--muted);font-size:14px}

/* CTA band */
.cta-band{background:linear-gradient(135deg,#0b1220,#1e293b);color:#fff;border-radius:24px;padding:34px;display:flex;align-items:center;justify-content:space-between;gap:24px;box-shadow:var(--shadow)}
.cta-band h2{margin:0 0 6px;font-size:28px;letter-spacing:-.5px}
.cta-band p{margin:0;color:#cbd5e1;font-size:14px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* Footer */
.footer{border-top:1px solid var(--line);padding:44px 0 140px;color:var(--muted);font-size:12px}
.footer-in{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
.footer a{color:var(--muted)}
.footer a:hover{color:var(--ink)}
.footer-meta{text-align:center;line-height:2}
.footer-meta a{text-decoration:underline;text-underline-offset:2px}
.disclaimer{max-width:820px;line-height:1.8;margin-top:18px}
.footer-meta .disclaimer{max-width:860px;margin:18px auto 0;text-align:left}
.brandline{font-weight:900;color:var(--ink);margin-bottom:6px}

/* Chat FAB */
.chat-fab{
  position:fixed;right:22px;bottom:22px;z-index:40;display:inline-flex;align-items:center;gap:9px;
  background:#0b1220;color:#fff;border-radius:999px;padding:12px 16px;font-size:14px;font-weight:800;
  box-shadow:0 12px 30px rgba(15,23,42,.25);
}
.chat-fab:hover{background:#1e293b}

/* Responsive */
@media (max-width:1000px){
  .hero-in{grid-template-columns:1fr;gap:28px}
  h1{font-size:40px}
  .cards{grid-template-columns:repeat(2,1fr)}
  .tiers{grid-template-columns:1fr}
}
@media (max-width:760px){
  .nav{display:none}
  .header-cta .btn-ghost{display:none}
  .hero{padding:52px 0 44px}
  h1{font-size:34px}
  .section{padding:46px 0}
  .cards,.steps,.grid-3,.grid-2{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start}
  .cta-band{flex-direction:column;align-items:flex-start}
  .hero-cta .btn{flex:1}
  .trust{flex-direction:column;gap:10px}
  .chat-fab{right:14px;bottom:14px}
  .kv{grid-template-columns:1fr}
  .kv div:nth-child(odd){margin-top:6px}
  .footer{padding-bottom:120px}
}