:root{--bg:#f7f8fb;--card:#fff;--ink:#14213d;--muted:#5b6475;--brand:#0f766e;--brand2:#14b8a6;--line:#e5e7eb;--warn:#b45309}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px}
a{color:var(--brand)}img{max-width:100%}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}
header.top{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
.logo{font-weight:800;text-decoration:none;color:var(--ink)}.logo span{color:var(--brand)}
nav a{margin-left:16px;text-decoration:none;color:var(--muted);font-size:15px}
@media(max-width:640px){nav .hide-m{display:none}}
.btn{display:inline-block;padding:12px 20px;border-radius:10px;font-weight:700;text-decoration:none;border:2px solid var(--brand);cursor:pointer;font-size:16px}
.btn.primary{background:var(--brand);color:#fff}.btn.ghost{background:#fff;color:var(--brand)}
.btn.sm{padding:8px 14px;font-size:14px}
.hero{padding:56px 0 40px;background:linear-gradient(160deg,#ecfdf5,#f7f8fb 60%)}
.hero h1{font-size:clamp(28px,6vw,44px);line-height:1.2;margin:0 0 14px}
.hero p.lead{font-size:18px;color:var(--muted);max-width:640px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:14px;color:var(--muted)}
section{padding:48px 0}section h2{font-size:clamp(24px,4.5vw,32px);margin:0 0 8px}
.sub{color:var(--muted);margin:0 0 26px}
.grid{display:grid;gap:18px}
@media(min-width:760px){.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 1px 2px rgba(0,0,0,.03)}
.price{font-size:28px;font-weight:800;color:var(--brand);margin:6px 0}
.price small{font-size:14px;color:var(--muted);font-weight:500}
.card ul{padding-left:20px;margin:10px 0 16px}.card li{margin:4px 0}
.tag{display:inline-block;font-size:12px;font-weight:700;background:#ccfbf1;color:#115e59;padding:2px 10px;border-radius:999px}
.demo img,.demo .thumb{border-radius:10px;border:1px solid var(--line);width:100%;aspect-ratio:16/10;object-fit:cover;background:#eef2f7}
.steps{counter-reset:s;list-style:none;padding:0;display:grid;gap:14px}
@media(min-width:760px){.steps{grid-template-columns:repeat(4,1fr)}}
.steps li{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;counter-increment:s}
.steps li::before{content:counter(s);display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;margin-bottom:8px}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
summary{font-weight:700;cursor:pointer}
.pay img{background:#fff;padding:8px;border:1px solid var(--line);border-radius:12px;width:200px;height:200px}
code.addr{word-break:break-all;background:#f1f5f9;padding:6px 8px;border-radius:8px;display:block;font-size:14px}
.notice{background:#fffbeb;border:1px solid #fde68a;color:var(--warn);padding:10px 14px;border-radius:10px;font-size:14px}
footer{padding:30px 0 90px;color:var(--muted);font-size:14px;border-top:1px solid var(--line)}
.float{position:fixed;right:14px;bottom:14px;z-index:20;box-shadow:0 6px 20px rgba(15,118,110,.35)}
.muted{color:var(--muted)}
form.contact{display:grid;gap:10px;max-width:560px;margin:0 auto;text-align:left}
form.contact input,form.contact select,form.contact textarea{width:100%;padding:11px;border:1px solid var(--line);border-radius:10px;font:inherit;background:#fff}
form.contact textarea{min-height:110px}