:root{
  --bg:#f4f7f6;--card:#ffffff;--ink:#10232f;--muted:#566872;--line:#dfe7e4;
  --accent:#087a5f;--accent-ink:#ffffff;--accent-soft:#e3f5ef;--link:#06694f;
  --b1:#087a5f;--b2:#f2a93b;--good:#087a5f;--radius:14px;
  --shadow:0 1px 2px rgba(16,35,47,.06),0 8px 24px rgba(16,35,47,.05);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0d1920;--card:#14252e;--ink:#e8f0f2;--muted:#9bb0b8;--line:#25394380;
    --accent:#2ec4a0;--accent-ink:#06231c;--accent-soft:#12352e;--link:#5fe0c0;--b1:#2ec4a0;--shadow:none}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);line-height:1.6;font-size:17px}
a{color:var(--link)}
img,svg{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-ink);padding:8px 12px;z-index:10}
.skip:focus{left:8px;top:8px}

/* header */
.site-header{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.site-header .wrap{display:flex;align-items:center;gap:20px;min-height:60px}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.25rem;letter-spacing:-.02em;white-space:nowrap}
.logo b{color:var(--accent)}
.logo svg{width:28px;height:28px;flex:none}
.nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;flex:1}
.nav::-webkit-scrollbar{display:none}
.nav a{padding:8px 11px;border-radius:9px;text-decoration:none;color:var(--ink);font-size:.95rem;font-weight:600;white-space:nowrap}
.nav a:hover,.nav a[aria-current="page"]{background:var(--accent-soft);color:var(--link)}

/* hero + home */
.hero{padding:44px 0 26px}
.hero h1{font-size:clamp(1.9rem,5vw,2.9rem);line-height:1.12;letter-spacing:-.03em;margin:0 0 12px;max-width:16em}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{font-size:1.12rem;color:var(--muted);max-width:36em;margin:0}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin:26px 0 8px}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .12s,border-color .12s}
.card:hover{transform:translateY(-2px);border-color:var(--accent)}
.card .badge{display:inline-grid;place-items:center;min-width:46px;height:34px;padding:0 10px;border-radius:9px;background:var(--accent-soft);color:var(--link);font-weight:800;font-size:.9rem;letter-spacing:.03em}
.card h2{font-size:1.15rem;margin:12px 0 4px}
.card p{margin:0;color:var(--muted);font-size:.96rem}
.points{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin:34px 0}
.points div{padding:4px 2px}
.points h3{margin:0 0 4px;font-size:1.05rem}
.points p{margin:0;color:var(--muted);font-size:.96rem}

/* calculator page */
.page-head{padding:30px 0 6px}
.crumbs{font-size:.88rem;color:var(--muted);margin-bottom:8px}
.crumbs a{color:var(--muted)}
.page-head h1{margin:0 0 8px;font-size:clamp(1.65rem,4.2vw,2.4rem);letter-spacing:-.025em;line-height:1.15}
.page-head p{margin:0;color:var(--muted);max-width:44em}
.calc{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:22px 0}
.calc>*{min-width:0}
.panel{background:var(--card);min-width:0;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel h2{font-size:1.05rem;margin:0 0 14px}
.field{margin-bottom:20px}
.field:last-child{margin-bottom:0}
.field label,.field .lbl{display:block;font-weight:650;font-size:.95rem;margin-bottom:6px}
.inputwrap{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);padding:0 12px;transition:border-color .12s}
.inputwrap:focus-within{border-color:var(--accent)}
.inputwrap span{color:var(--muted);font-weight:650}
.inputwrap input{flex:1;min-width:0;border:0;background:transparent;color:var(--ink);font:inherit;font-size:1.08rem;font-weight:650;padding:11px 8px;outline:none}
select{width:100%;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);font:inherit;font-weight:600;padding:11px 12px}
select:focus{outline:2px solid var(--accent);outline-offset:1px}
input[type=range]{width:100%;margin:10px 0 0;accent-color:var(--accent);height:24px}
.check{display:flex;gap:10px;align-items:center;font-weight:600;cursor:pointer}
.check input{width:20px;height:20px;accent-color:var(--accent)}
.seg{display:flex;border:1.5px solid var(--line);border-radius:10px;overflow:hidden}
.seg label{flex:1;margin:0;text-align:center;padding:10px 6px;cursor:pointer;font-weight:650;font-size:.95rem;background:var(--bg)}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg input:checked+span{background:var(--accent);color:var(--accent-ink)}
.seg label span{display:block;margin:-10px -6px;padding:10px 6px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.chip{border:1.5px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;font-weight:700;padding:8px 15px;border-radius:999px;cursor:pointer}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.hint{font-size:.85rem;color:var(--muted);margin-top:6px}
.words{font-size:.86rem;font-weight:650;color:var(--link);margin-top:6px}
.words:empty{display:none}

.big{background:var(--accent-soft);border-radius:12px;padding:16px 18px;margin-bottom:16px}
.big .k{font-size:.9rem;color:var(--muted);font-weight:650}
.big .v{font-size:clamp(1.7rem,5vw,2.3rem);font-weight:800;letter-spacing:-.02em;line-height:1.2;color:var(--link)}
.rows{margin:0 0 16px}
.rows div{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}
.rows div:last-child{border-bottom:0}
.rows dt{color:var(--muted)}
.rows dd{margin:0;font-weight:750;text-align:right}
.bar{display:flex;height:14px;border-radius:99px;overflow:hidden;background:var(--line);margin:6px 0 8px}
.bar span{display:block;height:100%;transition:width .25s}
.bar .b1{background:var(--b1)}
.bar .b2{background:var(--b2)}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:.86rem;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px}
.legend .l1{background:var(--b1)}.legend .l2{background:var(--b2)}
.verdict{border-radius:12px;padding:13px 16px;margin-bottom:16px;font-weight:700;background:var(--accent-soft);color:var(--link)}
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:16px}
.cmp .col{border:1.5px solid var(--line);border-radius:12px;padding:13px 14px}
.cmp .col.win{border-color:var(--accent);background:var(--accent-soft)}
.cmp h3{margin:0 0 6px;font-size:.95rem}
.cmp .tot{font-size:1.45rem;font-weight:800;letter-spacing:-.02em;margin-bottom:6px}
.cmp dl{margin:0;font-size:.88rem}
.cmp dl div{display:flex;justify-content:space-between;gap:8px;padding:3px 0}
.cmp dt{color:var(--muted)}.cmp dd{margin:0;font-weight:700}

.tablewrap{overflow-x:auto;margin-top:6px}
table{width:100%;border-collapse:collapse;font-size:.94rem}
th,td{padding:9px 10px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.tablewrap.tall{max-height:340px;overflow-y:auto}

/* content */
.content{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;margin:22px 0;box-shadow:var(--shadow)}
.content h2{font-size:1.3rem;margin:1.4em 0 .5em;letter-spacing:-.01em}
.content h2:first-child{margin-top:0}
.content h3{font-size:1.05rem;margin:1.2em 0 .3em}
.content p,.content li{max-width:46em}
.content code,.formula{background:var(--accent-soft);padding:2px 7px;border-radius:6px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em}
.formula{display:block;padding:12px 14px;margin:12px 0;overflow-x:auto;max-width:46em}
.faq details{border-bottom:1px solid var(--line);padding:12px 0}
.faq summary{cursor:pointer;font-weight:700}
.faq p{margin:.6em 0 0}
.related{display:flex;gap:10px;flex-wrap:wrap}
.related a{padding:9px 14px;border:1.5px solid var(--line);border-radius:10px;text-decoration:none;font-weight:650;color:var(--ink);background:var(--bg)}
.related a:hover{border-color:var(--accent)}
.note{font-size:.86rem;color:var(--muted)}

/* ads: reserved only when an ad unit is configured */
.ad-slot{margin:22px 0;text-align:center}
.ad-slot:not(:has(ins)){display:none}
.ad-slot:has(ins)::before{content:"Advertisement";display:block;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.ad-slot ins{min-height:90px}

/* footer */
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:28px 0 40px;color:var(--muted);font-size:.92rem;background:var(--card)}
.site-footer .links{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:12px}
.site-footer a{color:var(--muted)}
.site-footer p{margin:6px 0;max-width:52em}

@media (max-width:820px){
  .calc{grid-template-columns:1fr}
  .site-header .wrap{gap:10px}
  body{font-size:16.5px}
  .content{padding:20px 16px}
  .cmp{grid-template-columns:1fr}
}
@media print{.site-header,.site-footer,.ad-slot,.related{display:none}}