:root{
  --ink:#0e1726; --muted:#54617a; --line:#dfe4ee; --bg:#f5f7fb; --card:#ffffff;
  --slate:#16263f; --slate2:#1e3454; --amber:#f6a723; --amber-d:#c9820b;
  --good:#178a58; --bad:#c0392b; --radius:14px;
}
*{box-sizing:border-box}
html,body{width:100%;overflow-x:hidden;margin:0}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.68;font-size:17px}
a{color:#154a9e}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1080px;margin:0 auto;padding:0 22px}

/* header */
.site-head{background:var(--slate);color:#fff;position:sticky;top:0;z-index:40;
  box-shadow:0 2px 10px rgba(10,20,40,.25)}
.head-row{display:flex;align-items:center;justify-content:space-between;
  flex-wrap:nowrap;gap:14px;padding:12px 0}
.brand-logo{color:#fff;text-decoration:none;font-weight:800;font-size:1.28rem;
  letter-spacing:.2px;white-space:nowrap}
.brand-logo b{color:var(--amber);font-weight:800}
.nav-wrap{margin-left:auto;display:flex;align-items:center;gap:14px}
.nav-main{display:flex;flex-wrap:nowrap;gap:4px;list-style:none;margin:0;padding:0}
.nav-main a{color:#e6ecf6;text-decoration:none;font-size:.93rem;font-weight:600;
  padding:7px 9px;border-radius:8px;white-space:nowrap}
.nav-main a:hover,.nav-main a.on{background:rgba(255,255,255,.12);color:#fff}
.cta-top{background:var(--amber);color:#20160a;font-weight:800;text-decoration:none;
  padding:9px 15px;border-radius:10px;white-space:nowrap;font-size:.92rem}
.cta-top:hover{background:var(--amber-d)}
.burger{display:none;margin-left:auto;background:transparent;border:2px solid rgba(255,255,255,.4);
  color:#fff;border-radius:9px;padding:6px 10px;font-size:1.2rem;cursor:pointer}

/* breadcrumb */
.crumbs{background:#eef2f9;border-bottom:1px solid var(--line);font-size:.86rem}
.crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0;padding:9px 0}
.crumbs a{color:#33507e;text-decoration:none}
.crumbs li+li::before{content:"›";margin-right:6px;color:#8b98ad}

/* main */
main{padding:22px 0 8px}
h1{font-size:2rem;line-height:1.2;margin:.2em 0 .35em}
h2{font-size:1.42rem;margin:1.5em 0 .4em;color:var(--slate2)}
h3{font-size:1.14rem;margin:1.2em 0 .3em;color:var(--slate2)}
p{margin:.7em 0}
.lede{font-size:1.12rem;color:#26324a;background:#fff;border-left:4px solid var(--amber);
  padding:14px 18px;border-radius:0 10px 10px 0;box-shadow:0 1px 4px rgba(20,30,50,.06)}
.hero{width:100%;height:auto;border-radius:var(--radius);margin:16px 0 6px;
  box-shadow:0 6px 22px rgba(15,25,45,.16)}
figure{margin:16px 0}
figcaption{font-size:.85rem;color:var(--muted);margin-top:6px;text-align:center}
main ul,main ol{margin:.6em 0 1em;padding-left:1.25em}
main li{margin:.32em 0}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;margin:16px 0;box-shadow:0 1px 4px rgba(20,30,50,.05)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:16px 0;
  border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;min-width:460px}
th,td{padding:10px 13px;text-align:left;border-bottom:1px solid var(--line);font-size:.95rem}
th{background:var(--slate);color:#fff;font-weight:700}
tbody tr:nth-child(even){background:#f4f7fc}

.pc{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:16px 0}
.pc>div{border-radius:12px;padding:14px 16px}
.pros{background:#eaf7f0;border:1px solid #bde6cf}
.cons{background:#fdeeec;border:1px solid #f3c9c2}
.pc h3{margin-top:0}

.tabs{display:flex;flex-wrap:wrap;gap:6px;margin:16px 0 0}
.tabs button{background:#e7edf7;border:1px solid var(--line);border-radius:9px 9px 0 0;
  padding:9px 14px;font-weight:700;cursor:pointer;font-size:.9rem;color:var(--slate2)}
.tabs button.on{background:#fff;border-bottom-color:#fff;color:var(--ink)}
.tabpane{display:none;border:1px solid var(--line);border-radius:0 12px 12px 12px;
  padding:16px 18px;background:#fff}
.tabpane.on{display:block}

.calc{background:var(--slate2);color:#eaf0fa;border-radius:14px;padding:18px 20px;margin:18px 0}
.calc label{display:block;font-size:.88rem;margin:10px 0 4px;color:#cdd9ee}
.calc input,.calc select{width:100%;padding:9px 11px;border-radius:8px;
  border:1px solid #43597b;background:#12233c;color:#fff;font-size:1rem}
.calc .out{margin-top:14px;background:#0e1c31;border-radius:10px;padding:12px 14px;font-size:1.05rem}
.calc .out b{color:var(--amber)}

details{background:#fff;border:1px solid var(--line);border-radius:11px;margin:10px 0;
  padding:2px 16px}
details[open]{box-shadow:0 2px 8px rgba(20,30,50,.06)}
summary{cursor:pointer;font-weight:700;padding:12px 0;color:var(--slate2)}
.faq p{margin:0 0 12px}

.spin{background:linear-gradient(135deg,var(--slate),var(--slate2));color:#fff;
  border-radius:16px;padding:22px 24px;margin:24px 0}
.spin h2{color:#fff;margin-top:0}
.spin .btn{display:inline-block;background:var(--amber);color:#20160a;font-weight:800;
  text-decoration:none;padding:13px 26px;border-radius:11px;margin-top:8px}
.spin .btn:hover{background:var(--amber-d)}
.note{font-size:.82rem;color:#cbd6ea;margin-top:12px}

.rg{background:#fff5e6;border:1px solid #f2d69a;border-radius:12px;padding:12px 16px;
  font-size:.9rem;margin:18px 0}

.site-foot{background:var(--slate);color:#c8d2e2;margin-top:32px;padding:26px 0 20px;font-size:.9rem}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:22px}
.site-foot h4{color:#fff;margin:0 0 8px;font-size:1rem}
.site-foot a{color:#c8d2e2;text-decoration:none;display:block;margin:5px 0}
.site-foot a:hover{color:#fff}
.foot-brand{font-weight:800;font-size:1.1rem;color:#fff}
.copy{border-top:1px solid #2c405f;margin-top:20px;padding-top:14px;font-size:.82rem;color:#93a2bb}

#toTop{position:fixed;right:16px;bottom:16px;background:var(--amber);color:#20160a;
  border:none;border-radius:50%;width:46px;height:46px;font-size:1.3rem;cursor:pointer;
  display:none;box-shadow:0 4px 12px rgba(0,0,0,.3);z-index:50}
#toTop.show{display:block}

@media(max-width:860px){
  .burger{display:block}
  .nav-wrap{display:none;position:absolute;left:0;right:0;top:100%;background:var(--slate2);
    flex-direction:column;align-items:stretch;gap:0;padding:8px 22px 16px;margin:0}
  .nav-wrap.open{display:flex}
  .nav-main{flex-direction:column;gap:0;width:100%}
  .nav-main a{padding:11px 6px;border-bottom:1px solid rgba(255,255,255,.08)}
  .cta-top{text-align:center;margin-top:10px}
  .site-head{position:relative}
}
@media(max-width:720px){
  body{font-size:16px}
  h1{font-size:1.62rem}
  h2{font-size:1.26rem}
  .wrap{padding:0 22px}
  .pc,.foot-grid{grid-template-columns:1fr}
}