:root{--ink:#0f172a;--mut:#475569;--line:#e2e8f0;--bg:#f8fafc;--acc:#0b1220;--hi:#2563eb;--ok:#15803d;--bad:#b91c1c}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:#fff}
a{color:var(--hi)}.wrap{max-width:920px;margin:0 auto;padding:0 20px}
header.top{border-bottom:1px solid var(--line)}header.top .wrap{display:flex;justify-content:space-between;align-items:center;height:60px}
.brand{font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--acc);text-decoration:none}
nav a{margin-left:18px;color:var(--mut);text-decoration:none;font-size:14px}
.hero{padding:64px 0 40px}.hero h1{font-size:clamp(30px,5vw,48px);line-height:1.1;letter-spacing:-.03em;margin:0 0 16px}
.hero p.lead{font-size:19px;color:var(--mut);max-width:680px;margin:0 0 24px}
.btn{display:inline-block;background:var(--acc);color:#fff;border:0;border-radius:10px;padding:14px 22px;font-size:16px;font-weight:700;cursor:pointer;text-decoration:none}
.btn:hover{background:#1e293b}.btn.sec{background:#e2e8f0;color:var(--ink)}.fine{font-size:13px;color:var(--mut);margin-top:10px}
section{padding:36px 0;border-top:1px solid var(--line)}h2{font-size:26px;letter-spacing:-.02em;margin:0 0 14px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}
.card{border:1px solid var(--line);border-radius:12px;padding:18px;background:var(--bg)}.card h3{margin:0 0 6px;font-size:17px}
.demo{border:2px dashed #94a3b8;border-radius:14px;background:var(--bg);text-align:center;padding:0;overflow:hidden}
.demo img{display:block;width:100%;height:auto}
table{border-collapse:collapse;width:100%;font-size:14.5px}th,td{border:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:top}th{background:var(--bg)}
td.y{color:var(--ok);font-weight:600}td.n{color:var(--bad);font-weight:600}
.price{font-size:44px;font-weight:800;letter-spacing:-.03em}.price small{font-size:16px;color:var(--mut);font-weight:500}
details{border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:10px 0;background:#fff}summary{cursor:pointer;font-weight:650}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--mut);font-size:14px}
.note{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:12px 14px;font-size:14px}
code{background:#f1f5f9;padding:1px 5px;border-radius:4px;font-size:.92em}
.err{color:var(--bad);font-size:14px;margin-top:8px}