:root{--b:#1d4ed8;--bd:#1e3a8a;--g:#f1f5f9;--t:#0f172a;--m:#475569;--ok:#15803d}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font:17px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--t);background:#fff}
a{color:var(--b)}.w{max-width:860px;margin:0 auto;padding:0 18px}
header.top{border-bottom:1px solid #e2e8f0;background:#fff}header.top .w{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:58px;flex-wrap:wrap}
.logo{font-weight:800;color:var(--bd);text-decoration:none;font-size:19px}.nav{display:flex;gap:14px;flex-wrap:wrap;font-size:15px}.nav a{text-decoration:none;padding:8px 2px}
main{padding:26px 0 40px}h1{font-size:clamp(28px,6vw,40px);line-height:1.15;margin:.2em 0 .4em}h2{font-size:clamp(22px,4.6vw,28px);margin:1.6em 0 .5em;line-height:1.25}h3{font-size:19px;margin:1.2em 0 .3em}
.answer{background:#eff6ff;border-left:5px solid var(--b);padding:14px 16px;border-radius:8px;font-size:18px}
.meta{color:var(--m);font-size:14px}table{width:100%;border-collapse:collapse;font-size:16px;margin:10px 0}th,td{border:1px solid #e2e8f0;padding:9px;text-align:left;vertical-align:top}th{background:#e0e7ff}
.tw{overflow-x:auto}.btn{display:inline-block;background:var(--b);color:#fff;text-decoration:none;font-weight:700;padding:15px 22px;border-radius:10px;text-align:center;min-height:48px}.btn:hover{background:var(--bd)}.btn.s{background:#fff;color:var(--b);border:2px solid var(--b)}
.cta{background:var(--g);border-radius:14px;padding:22px;margin:30px 0;text-align:center}.cta p{margin:.2em 0 1em}.btns{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.btns .btn{flex:1 1 220px}
.q{border:1px solid #e2e8f0;border-radius:12px;padding:14px 16px;margin:12px 0}.q ol{padding-left:22px;margin:8px 0}.q li{margin:4px 0}
details{border:1px solid #e2e8f0;border-radius:10px;padding:12px 14px;margin:8px 0;background:#fff}summary{cursor:pointer;font-weight:700;min-height:28px}
.q details{border:0;padding:0;margin-top:8px}.q summary{color:var(--b)}.ok{color:var(--ok);font-weight:700}
.ph{background:#fef9c3;border:2px dashed #ca8a04;padding:12px;border-radius:8px;font-size:15px}
.grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}.card{border:1px solid #e2e8f0;border-radius:12px;padding:16px;text-decoration:none;color:inherit;display:block}.card b{color:var(--bd)}
.price{font-size:48px;font-weight:800;margin:0}footer{border-top:1px solid #e2e8f0;padding:24px 0 90px;font-size:14px;color:var(--m)}footer a{color:var(--m)}
.sticky{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid #e2e8f0;padding:10px 14px;display:none;gap:8px;z-index:9}
@media(max-width:640px){.sticky{display:flex}.sticky .btn{flex:1;padding:12px 8px;font-size:15px}.nav{font-size:14px;gap:10px}}
ul.src{font-size:15px}.formula{font-family:ui-monospace,Menlo,Consolas,monospace;background:var(--g);padding:10px 12px;border-radius:8px;overflow-x:auto;font-size:15px}
@media print{header.top,.sticky,.cta,footer .nav{display:none}}