:root{
--bg:#0f1320;--surface:#171c2e;--card:#1d2438;--ink:#eef1f8;--muted:#aab2c8;
--accent:#e63b54;--accent2:#ffc24b;--line:#2a3350;--ok:#3ad29f;
--wrap:1100px;--gut:22px;--radius:10px;
--font:'Sora',system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;}
*{box-sizing:border-box}
html,body{width:100%;overflow-x:hidden;margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--font);
line-height:1.68;font-size:17px;-webkit-font-smoothing:antialiased}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
a{color:var(--accent2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.25;font-weight:700}
h1{font-size:2.05em;margin:.2em 0 .5em}
h2{font-size:1.5em;margin:1.6em 0 .5em;color:#fff}
h3{font-size:1.15em;margin:1.2em 0 .4em}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.2em;padding-left:1.3em}
li{margin:.35em 0}
.scroll-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--accent);z-index:60}
/* header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(15,19,32,.92);
backdrop-filter:blur(8px);border-bottom:1px solid var(--line);transition:box-shadow .2s}
.site-head.scrolled{box-shadow:0 6px 22px rgba(0,0,0,.35)}
.head-row{display:flex;align-items:center;gap:12px;min-height:64px;flex-wrap:nowrap}
.brand-logo{color:#fff;font-weight:700;font-size:1.12em;letter-spacing:.2px;white-space:nowrap}
.brand-logo:hover{text-decoration:none}
.nav-main{margin-left:auto;display:flex;align-items:center;gap:8px;flex-wrap:nowrap;min-width:0}
.nav-main ul{display:flex;gap:1px;list-style:none;margin:0;padding:0;flex-wrap:nowrap}
.nav-main a{color:var(--muted);font-size:.8em;padding:6px 7px;border-radius:7px;white-space:nowrap}
.nav-main a:hover{color:#fff;background:var(--card);text-decoration:none}
.nav-main a.active{color:#fff}
.btn{display:inline-block;background:var(--accent);color:#fff;font-weight:600;
padding:11px 18px;border-radius:8px;border:0;cursor:pointer;white-space:nowrap}
.btn:hover{background:#ff4d68;text-decoration:none}
.btn-head{padding:7px 12px;font-size:.8em;flex:none}
.burger{display:none;margin-left:auto;background:transparent;border:0;width:42px;height:42px;
flex-direction:column;justify-content:center;gap:5px;cursor:pointer}
.burger span{display:block;height:2px;width:24px;background:#fff;margin:0 auto;transition:.2s}
.burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* breadcrumbs */
.crumbs{background:var(--surface);border-bottom:1px solid var(--line);font-size:.9em;padding:9px 0}
.crumbs a{color:var(--muted)}
.crumbs .current{color:var(--ink)}
/* body */
main .body{padding:26px 0 50px}
.snippet{background:var(--card);border-left:4px solid var(--accent2);
padding:16px 18px;border-radius:0 8px 8px 0;font-size:1.04em;color:#f4f6fb}
.note{background:rgba(58,210,159,.08);border:1px solid rgba(58,210,159,.35);
color:#d9f7ec;padding:13px 16px;border-radius:8px}
.hero-fig{margin:0 0 1.3em}
.hero-fig img{width:90%;height:auto;display:block;margin:0 auto;border-radius:10px;
box-shadow:0 10px 30px rgba(0,0,0,.4)}
ul li::marker{color:var(--accent2)}
ol li::marker{color:var(--accent2);font-weight:700}
/* cta */
.cta{background:linear-gradient(135deg,#202a45,#171c2e);border:1px solid var(--line);
border-radius:12px;padding:22px;margin:1.8em 0;text-align:center}
.cta p{margin:0 0 14px;color:#fff;font-weight:500}
.cta .btn{font-size:1.05em;padding:13px 28px}
/* faq */
.faq{margin:2em 0 1em}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:9px;
margin:.55em 0;overflow:hidden}
.faq-item summary{cursor:pointer;padding:15px 18px;font-weight:600;list-style:none;
min-height:44px;display:flex;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';margin-left:auto;color:var(--accent2);font-size:1.3em}
.faq-item[open] summary::after{content:'–'}
.faq-a{padding:0 18px 14px}
.faq-a p{margin:0;color:var(--muted)}
/* calculator */
.calc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;margin:1.8em 0}
.calc h3{margin-top:0}
.calc-row{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:12px}
.calc-row label{display:flex;flex-direction:column;gap:6px;font-size:.92em;color:var(--muted);flex:1;min-width:200px}
.calc select,.calc input{background:var(--surface);color:var(--ink);border:1px solid var(--line);
border-radius:7px;padding:9px}
.calc-out{background:var(--surface);border-radius:8px;padding:13px 15px;margin:0;color:#f1f4fb}
.muted{font-size:.82em;color:#7e879c;margin:.5em 0 0}
/* table */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 0 1.2em}
table{border-collapse:collapse;width:100%;min-width:420px}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left}
th{background:var(--surface)}
/* totop */
.totop{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border-radius:50%;
border:0;background:var(--accent);color:#fff;font-size:1.3em;cursor:pointer;opacity:0;
pointer-events:none;transition:.25s;z-index:40}
.totop.show{opacity:1;pointer-events:auto}
/* footer */
.site-foot{background:#0b0e18;border-top:1px solid var(--line);margin-top:30px;padding:34px 0 0}
.foot-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.foot-col h3{font-size:1em;color:#fff;margin:0 0 .7em}
.foot-col ul{list-style:none;padding:0;margin:0}
.foot-col li{margin:.3em 0}
.foot-col a{color:var(--muted);font-size:.92em}
.foot-rg .age{display:inline-block;background:var(--accent);color:#fff;font-weight:700;
border-radius:5px;padding:1px 8px;margin-right:6px}
.legal{border-top:1px solid var(--line);margin-top:26px;padding:16px 0;font-size:.82em;color:#7e879c}
/* Collapse the full menu to a burger as soon as it would stop fitting on one
   row (the menu + logo + CTA need ~1240px). Below this width the burger shows;
   above it the desktop menu fits with margin. Kept separate from the 860px
   mobile-layout block so desktop page layout is unaffected. */
@media(max-width:1240px){
.burger{display:flex}
.nav-main{display:none;position:absolute;top:64px;left:0;right:0;background:var(--surface);
flex-direction:column;align-items:stretch;gap:0;padding:8px 0 14px;border-bottom:1px solid var(--line)}
.nav-main.open{display:flex}
.nav-main ul{flex-direction:column;gap:0;padding:0 var(--gut)}
.nav-main a{font-size:.95em;padding:12px 6px;display:block}
.btn-head{margin:10px var(--gut) 0;text-align:center;font-size:.95em}
}
@media(max-width:860px){
.foot-grid{grid-template-columns:1fr;gap:20px}
h1{font-size:1.55em}h2{font-size:1.28em}h3{font-size:1.08em}
.hero-fig img{width:100%}
}