:root{--bg:#ffffff;--ink:#0f1419;--muted:#536471;--line:#e5e9eb;--brand:#1d9bf0;--brand-ink:#0b76c4;--soft:#f7f9f9;--radius:16px;--max:1080px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.6 -apple-system,BlinkMacSystemFont,Segoe UI,system-ui,PingFang SC,Microsoft YaHei,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}a{color:inherit}h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0}p{margin:0}.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}.btn{display:inline-block;padding:14px 26px;border-radius:999px;font-weight:700;text-decoration:none;transition:transform .08s ease,background .15s ease}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-ink)}.btn-ghost{background:var(--soft);color:var(--ink)}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:rgba(255,255,255,.85);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}.brand{font-weight:800;font-size:18px}.brand span{color:var(--brand)}.hero{padding:84px 0 64px;text-align:center;background:radial-gradient(900px 380px at 50% -120px,#e8f5fe,transparent)}.hero h1{font-size:clamp(32px,5vw,52px);max-width:780px;margin:0 auto}.hero p.lead{font-size:clamp(17px,2.4vw,21px);color:var(--muted);max-width:620px;margin:20px auto 0}.cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:32px}.note{color:var(--muted);font-size:14px;margin-top:16px}section{padding:64px 0}.section-title{font-size:clamp(24px,3.5vw,34px);text-align:center}.section-sub{color:var(--muted);text-align:center;max-width:560px;margin:12px auto 0}.grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:20px;gap:20px;margin-top:40px}.card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff}.card h3{font-size:18px}.card p{color:var(--muted);margin-top:8px;font-size:15px}.card .ico{font-size:24px}.steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);grid-gap:20px;gap:20px;margin-top:40px}.step{position:relative;padding:24px;border-radius:var(--radius);background:var(--soft)}.step:before{counter-increment:step;content:counter(step);display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;margin-bottom:12px}.step h3{font-size:16px}.step p{color:var(--muted);font-size:14px;margin-top:6px}.price-wrap{display:flex;justify-content:center;margin-top:40px}.price{border:2px solid var(--brand);border-radius:22px;padding:36px;max-width:380px;width:100%;text-align:center}.price .tag{display:inline-block;background:#e8f5fe;color:var(--brand-ink);font-weight:700;font-size:13px;padding:5px 12px;border-radius:999px}.price .amt{font-size:52px;font-weight:800;margin:16px 0 4px}.price .amt small{font-size:18px;color:var(--muted);font-weight:600}.price ul{list-style:none;padding:0;margin:20px 0 28px;text-align:left}.price li{padding:7px 0 7px 28px;position:relative;color:var(--ink)}.price li:before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:800}.price .btn{width:100%}.faq{max-width:720px;margin:40px auto 0}.faq details{border-bottom:1px solid var(--line);padding:18px 0}.faq summary{font-weight:700;cursor:pointer;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq p{margin-top:10px}.faq p,footer{color:var(--muted)}footer{border-top:1px solid var(--line);padding:40px 0;font-size:14px}footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}footer a{text-decoration:none;margin-left:18px}footer a:hover{color:var(--ink)}.legal{max-width:760px;padding:56px 24px;margin:0 auto}.legal h1{font-size:32px}.legal h2{font-size:20px;margin-top:32px}.legal li,.legal p{color:var(--muted);margin-top:12px}.legal a{color:var(--brand-ink)}@media (max-width:820px){.grid,.steps{grid-template-columns:1fr 1fr}}@media (max-width:520px){.grid,.steps{grid-template-columns:1fr}footer .wrap{flex-direction:column}footer a{margin:0 18px 0 0}}