:root{
  --canvas:#ffffff;
  --surface:#f6f8fb;
  --surface-2:#eef2f8;
  --ink:#0d1526;
  --ink-2:#5a6675;
  --ink-3:#8a94a3;
  --line:#e6eaf0;
  --line-strong:#d3dae4;
  --brand:#2563eb;
  --brand-hover:#1d4ed8;
  --brand-soft:#eaf1ff;
  --accent:#06b6d4;
  --ok:#0f9d6e;
  --dark:#0b1220;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(13,21,38,.04),0 12px 32px rgba(13,21,38,.06);
  --maxw:1160px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--canvas);color:var(--ink);
  font-family:var(--font);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.2;font-weight:600;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;z-index:100}
.skip:focus{left:0}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:32px;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:17px;letter-spacing:-.02em;flex:0 0 auto}
.brand .mark{width:28px;height:28px;border-radius:8px;background:var(--dark);display:grid;place-items:center;color:#fff;font-size:13px;font-weight:700}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:8px}
.nav-links a{padding:8px 14px;border-radius:8px;font-size:15px;color:var(--ink-2);transition:color .15s,background .15s}
.nav-links a:hover{color:var(--ink);background:var(--surface)}
.nav-links a[aria-current="page"]{color:var(--ink);font-weight:600;background:var(--brand-soft)}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.lang-switch{display:inline-flex;border:1px solid var(--line-strong);border-radius:999px;padding:2px;background:#fff}
.lang-switch button{border:0;background:transparent;padding:5px 12px;border-radius:999px;font-size:13px;color:var(--ink-2);cursor:pointer;transition:.15s}
.lang-switch button[aria-pressed="true"]{background:var(--dark);color:#fff}
.nav-toggle{display:none;border:1px solid var(--line-strong);background:#fff;border-radius:8px;width:40px;height:40px;cursor:pointer;align-items:center;justify-content:center}
.nav-toggle span{display:block;width:16px;height:1.5px;background:var(--ink);position:relative}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:16px;height:1.5px;background:var(--ink)}
.nav-toggle span::before{top:-5px}.nav-toggle span::after{top:5px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:var(--radius-sm);font-size:15px;font-weight:500;border:1px solid transparent;cursor:pointer;transition:.15s;min-height:44px}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-hover)}
.btn-ghost{background:#fff;border-color:var(--line-strong);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink-3);background:var(--surface)}
.btn-dark{background:var(--dark);color:#fff}
.btn-dark:hover{background:#16233c}
.btn-sm{padding:8px 14px;font-size:14px;min-height:38px}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--brand);font-weight:500;font-size:15px}
.link-arrow:hover{gap:10px}

/* ---------- sections ---------- */
.section{padding:88px 0}
.section.tight{padding:64px 0}
.section.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin-bottom:14px}
.section-head{max-width:720px;margin-bottom:48px}
.section-head h2{font-size:clamp(26px,3.4vw,34px)}
.section-head p{margin-top:14px;color:var(--ink-2);font-size:16px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}

/* ---------- hero ---------- */
.hero{padding:96px 0 80px;border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;opacity:.5;mask-image:radial-gradient(ellipse 70% 60% at 70% 20%,#000,transparent 75%);-webkit-mask-image:radial-gradient(ellipse 70% 60% at 70% 20%,#000,transparent 75%);pointer-events:none}
.hero .wrap{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(34px,4.6vw,54px);letter-spacing:-.025em}
.hero .lede{margin-top:20px;font-size:17px;color:var(--ink-2);max-width:560px}
.hero-actions{margin-top:32px;display:flex;flex-wrap:wrap;gap:12px}
.hero-meta{margin-top:28px;display:flex;flex-wrap:wrap;gap:20px;font-size:13px;color:var(--ink-3)}
.hero-meta span{display:inline-flex;align-items:center;gap:7px}
.dot{width:6px;height:6px;border-radius:50%;background:var(--ok);display:inline-block}

/* ---------- cards & grids ---------- */
.grid{display:grid;gap:20px}
.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:var(--radius);padding:26px;transition:border-color .18s,box-shadow .18s,transform .18s}
.card:hover{border-color:var(--line-strong);box-shadow:var(--shadow);transform:translateY(-2px)}
.card h3{font-size:18px;margin-bottom:10px}
.card p{color:var(--ink-2);font-size:15px}
.card .icon{width:40px;height:40px;border-radius:10px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;margin-bottom:16px}
.card .icon svg{width:20px;height:20px}
.tag{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.04em;padding:4px 10px;border-radius:999px;background:var(--surface-2);color:var(--ink-2)}
.tag.brand{background:var(--brand-soft);color:var(--brand)}
.tag.ok{background:#e6f6ef;color:var(--ok)}

/* ---------- feature list ---------- */
.checks{display:grid;gap:12px;margin-top:18px}
.checks li{display:flex;gap:10px;align-items:flex-start;font-size:15px;color:var(--ink-2)}
.checks li svg{flex:0 0 auto;width:18px;height:18px;margin-top:3px;color:var(--brand)}

/* ---------- product block ---------- */
.product{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:64px 0;border-top:1px solid var(--line)}
.product:first-of-type{border-top:0;padding-top:0}
.product.flip .product-media{order:-1}
.product h3{font-size:clamp(22px,2.6vw,28px);margin:14px 0 12px}
.product .desc{color:var(--ink-2);font-size:16px}
.product-media{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;overflow:hidden}
.product-media svg{width:100%;height:auto}

/* ---------- pricing ---------- */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:start}
.plan{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;display:flex;flex-direction:column;height:100%}
.plan.featured{border-color:var(--brand);box-shadow:var(--shadow);position:relative}
.plan .plan-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:6px}
.plan h3{font-size:19px}
.plan .sub{color:var(--ink-3);font-size:13px;margin-bottom:18px}
.plan .amount{font-size:34px;font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.plan .amount small{font-size:14px;font-weight:400;color:var(--ink-3);letter-spacing:0}
.plan .note{font-size:13px;color:var(--ink-3);margin-top:6px}
.plan .checks{margin:20px 0 24px}
.plan .btn{margin-top:auto;width:100%}
.plan .fine{margin-top:12px;font-size:12px;color:var(--ink-3);text-align:center}
.hw-note{margin-top:24px;display:flex;gap:12px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;font-size:14px;color:var(--ink-2)}
.hw-note svg{flex:0 0 auto;width:20px;height:20px;color:var(--brand);margin-top:2px}

/* ---------- table ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:640px}
th,td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line)}
th{background:var(--surface);font-size:13px;font-weight:600;color:var(--ink-2);letter-spacing:.02em}
tbody tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums}

/* ---------- steps ---------- */
.steps{counter-reset:s;display:grid;gap:20px}
.step{display:grid;grid-template-columns:44px 1fr;gap:18px;align-items:start}
.step .n{counter-increment:s;width:44px;height:44px;border-radius:12px;background:var(--dark);color:#fff;display:grid;place-items:center;font-weight:600;font-variant-numeric:tabular-nums}
.step .n::before{content:counter(s,decimal-leading-zero)}
.step h3{font-size:17px;margin-bottom:6px}
.step p{color:var(--ink-2);font-size:15px}

/* ---------- faq ---------- */
details{border:1px solid var(--line);border-radius:var(--radius-sm);padding:0 20px;background:#fff}
details+details{margin-top:12px}
details summary{cursor:pointer;padding:18px 0;font-weight:500;font-size:16px;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--ink-3);font-size:20px;line-height:1}
details[open] summary::after{content:"–"}
details .body{padding:0 0 20px;color:var(--ink-2);font-size:15px}

/* ---------- cta band ---------- */
.cta{background:var(--dark);color:#fff;border-radius:20px;padding:56px;display:grid;grid-template-columns:1.4fr auto;gap:32px;align-items:center}
.cta h2{font-size:clamp(24px,3vw,32px)}
.cta p{color:#a9b4c6;margin-top:12px;font-size:16px;max-width:560px}
.cta .btn-ghost{background:transparent;border-color:rgba(255,255,255,.28);color:#fff}
.cta .btn-ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.5)}

/* ---------- footer ---------- */
.site-footer{background:var(--dark);color:#a9b4c6;padding:64px 0 32px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.site-footer .brand{color:#fff}
.site-footer .brand .mark{background:#fff;color:var(--dark)}
.site-footer p{margin-top:16px;font-size:14px;max-width:320px}
.site-footer h4{color:#fff;font-size:13px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:16px}
.site-footer li+li{margin-top:10px}
.site-footer a{font-size:14px}
.site-footer a:hover{color:#fff}
.footer-bottom{margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:#7d8899}

/* ---------- notice ---------- */
.notice{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);background:var(--surface);border-radius:var(--radius-sm);padding:16px 18px;font-size:14px;color:var(--ink-2)}
.notice svg{flex:0 0 auto;width:18px;height:18px;color:var(--brand);margin-top:2px}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .product{grid-template-columns:1fr;gap:32px}
  .product.flip .product-media{order:0}
  .price-grid{grid-template-columns:1fr 1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .cta{grid-template-columns:1fr;padding:40px}
}
@media (max-width:768px){
  .nav{height:60px;gap:16px}
  .nav-toggle{display:inline-flex}
  .nav-links{position:absolute;top:60px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 16px;margin:0;display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 8px;border-radius:8px}
  .nav-right .btn{display:none}
  .section{padding:64px 0}
  .hero{padding:64px 0 56px}
  .grid-3,.grid-2,.price-grid{grid-template-columns:1fr}
  .grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .cta{padding:32px 24px}
  .wrap{padding:0 20px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  .card:hover{transform:none}
}