/* CalcNest - shared styles (all pages) */
:root{
  --brand:#0d9488;--brand-d:#0f766e;--brand-l:#ccfbf1;--ink:#0f172a;--ink2:#334155;--muted:#64748b;
  --bg:#f4f7fa;--card:#fff;--line:#e2e8f0;--cta:#f97316;--cta-d:#ea580c;--hdr:#0b1f33;--ok:#16a34a;--warn:#d97706;--bad:#dc2626;
  --shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.06);--r:14px;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme=light]){--ink:#e5edf5;--ink2:#cbd5e1;--muted:#94a3b8;--bg:#0a121c;--card:#111c2a;--line:#22324a;--brand-l:#0f3b3a;--hdr:#07111c;--shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35)}
}
:root[data-theme=dark]{--ink:#e5edf5;--ink2:#cbd5e1;--muted:#94a3b8;--bg:#0a121c;--card:#111c2a;--line:#22324a;--brand-l:#0f3b3a;--hdr:#07111c;--shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--brand-d);text-decoration:none}a:hover{text-decoration:underline}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) a{color:#5eead4}}
img,svg{max-width:100%}
.wrap{max-width:1160px;margin:0 auto;padding:0 18px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;color:#000;padding:8px 12px;z-index:99;border-radius:8px}

/* header */
.hdr{background:var(--hdr);color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 2px 12px rgba(0,0,0,.25)}
.hdr .wrap{display:flex;align-items:center;gap:18px;height:64px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:20px;letter-spacing:-.3px}
.logo:hover{text-decoration:none}
.logo i{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,#14b8a6,#0d9488);font-style:normal;font-size:19px}
.nav{display:flex;align-items:center;gap:4px;margin-left:8px}
.nav>a,.nav>.dd>button{color:#cfe3f1;background:none;border:0;font:600 15px/1 inherit;padding:10px 12px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:6px}
.nav>a:hover,.nav>.dd>button:hover,.dd.open>button{background:rgba(255,255,255,.1);color:#fff;text-decoration:none}
.dd{position:relative}
.dd>button::after{content:"";border:5px solid transparent;border-top-color:currentColor;margin-top:5px}
.mega{display:none;position:absolute;left:-40px;top:calc(100% + 10px);width:min(940px,94vw);background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:16px;box-shadow:0 24px 60px rgba(0,0,0,.35);padding:22px;grid-template-columns:repeat(4,1fr);gap:22px}
.dd.open .mega{display:grid}
.mega h4{margin:0 0 8px;font-size:12px;letter-spacing:.09em;text-transform:uppercase;color:var(--muted);display:flex;gap:6px;align-items:center}
.mega a,.mega span.soon{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 8px;margin:0 -8px;border-radius:8px;color:var(--ink);font-size:14.5px}
.mega a:hover{background:var(--brand-l);text-decoration:none}
.mega span.soon{color:var(--muted)}
.mega em{font-style:normal;font-size:10px;font-weight:700;background:var(--line);color:var(--muted);padding:2px 6px;border-radius:99px;letter-spacing:.04em}
.mega a em{background:var(--brand);color:#fff}
.hsearch{margin-left:auto;position:relative}
.hsearch input{width:230px;max-width:30vw;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#fff;border-radius:10px;padding:9px 12px 9px 34px;font:inherit;font-size:14px}
.hsearch input::placeholder{color:#9db6ca}
.hsearch:before{content:"\1F50D";position:absolute;left:11px;top:50%;transform:translateY(-50%);font-size:13px;opacity:.7}
.sres{position:absolute;right:0;top:calc(100% + 8px);width:320px;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:12px;box-shadow:0 18px 40px rgba(0,0,0,.3);display:none;overflow:hidden}
.sres a{display:block;padding:10px 14px;color:var(--ink);font-size:14.5px;border-bottom:1px solid var(--line)}.sres a:hover{background:var(--brand-l);text-decoration:none}
.sres small{color:var(--muted)}
.burger{display:none;background:none;border:1px solid rgba(255,255,255,.25);color:#fff;border-radius:8px;padding:7px 10px;font-size:18px;cursor:pointer;margin-left:auto}
@media (max-width:900px){
  .burger{display:block}.hsearch{display:none}
  .nav{display:none;position:absolute;left:0;right:0;top:64px;background:var(--hdr);flex-direction:column;align-items:stretch;padding:10px 14px 18px;margin:0;max-height:78vh;overflow:auto}
  .nav.open{display:flex}
  .mega{position:static;display:none;width:auto;box-shadow:none;grid-template-columns:1fr 1fr;padding:14px;margin-top:6px}
  .dd.open .mega{display:grid}
}
@media (max-width:520px){.mega{grid-template-columns:1fr}}

/* hero */
.hero{background:linear-gradient(160deg,#0b1f33 0%,#0e3a4a 55%,#0d9488 130%);color:#fff;padding:34px 0 76px}
.crumbs{font-size:13.5px;color:#a5c4d6;margin-bottom:16px}.crumbs a{color:#bfe3f3}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 14px}
.chip{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);padding:5px 12px;border-radius:99px;font-size:13px;font-weight:600}
.hero h1{margin:0 0 10px;font-size:clamp(30px,5vw,46px);line-height:1.1;letter-spacing:-.8px}
.hero p.sub{margin:0;max-width:760px;color:#cfe3f1;font-size:18px}
.hero.home{padding:56px 0 84px;text-align:center}.hero.home p.sub{margin:0 auto}
.bigsearch{max-width:560px;margin:26px auto 0;position:relative}
.bigsearch input{width:100%;padding:16px 20px 16px 48px;border-radius:14px;border:0;font:inherit;font-size:17px;box-shadow:0 12px 30px rgba(0,0,0,.25);color:#0f172a}
.bigsearch:before{content:"\1F50D";position:absolute;left:18px;top:50%;transform:translateY(-50%)}
.bigsearch .sres{width:100%;text-align:left}

/* calculator */
.calc{margin-top:-52px;position:relative}
.panel{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);display:grid;grid-template-columns:1.15fr 1fr;overflow:hidden}
.inp{padding:26px 28px}
.out{background:linear-gradient(180deg,var(--brand-l),transparent 70%);border-left:1px solid var(--line);padding:26px 28px;min-height:320px}
@media (max-width:860px){.panel{grid-template-columns:1fr}.out{border-left:0;border-top:1px solid var(--line)}.inp,.out{padding:20px}}
.f{margin-bottom:16px}
.f>label,.fl{display:block;font-weight:700;font-size:14px;margin-bottom:6px;color:var(--ink)}
.f .hint{display:block;font-size:12.5px;color:var(--muted);margin-top:5px}
.ctrl{display:flex;align-items:stretch;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);transition:border-color .15s,box-shadow .15s}
.ctrl:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px rgba(13,148,136,.2);background:var(--card)}
.ctrl input,.ctrl select,.ctrl textarea{flex:1;min-width:0;border:0;background:transparent;color:var(--ink);font:inherit;font-size:16px;padding:11px 13px;outline:0;border-radius:10px}
.ctrl textarea{min-height:96px;resize:vertical}
.ctrl .u{display:grid;place-items:center;padding:0 13px;color:var(--muted);font-weight:700;font-size:14px;border-left:1.5px solid var(--line);background:var(--card);border-radius:0 9px 9px 0}
.ctrl .u.pre{border-left:0;border-right:1.5px solid var(--line);border-radius:9px 0 0 9px}
.seg{display:flex;background:var(--bg);border:1.5px solid var(--line);border-radius:10px;padding:3px;gap:3px;flex-wrap:wrap}
.seg label{flex:1;margin:0;text-align:center;cursor:pointer;font-weight:600;font-size:14px;padding:8px 10px;border-radius:7px;color:var(--ink2);white-space:nowrap}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg input:checked+span{background:var(--brand);color:#fff;display:block;margin:-8px -10px;padding:8px 10px;border-radius:7px}
.seg input:focus-visible+span{outline:3px solid var(--cta)}
.fh{font-size:12px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--brand-d);margin:22px 0 10px;padding-top:14px;border-top:1px dashed var(--line)}
.fh:first-child{margin-top:0;padding-top:0;border:0}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}@media (max-width:520px){.grid2{grid-template-columns:1fr}}
.rows{width:100%;border-collapse:separate;border-spacing:0 8px}
.rows th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);text-align:left;font-weight:700;padding:0 6px}
.rows td{padding:0 5px 0 0;vertical-align:middle}
.rows td .ctrl input,.rows td .ctrl select{padding:9px 10px;font-size:15px}
.rows .x{background:none;border:0;color:var(--muted);font-size:20px;cursor:pointer;padding:4px 8px;border-radius:8px}.rows .x:hover{color:var(--bad);background:var(--bg)}
.rowsw{overflow-x:auto}
.addrow{background:none;border:1.5px dashed var(--brand);color:var(--brand-d);font-weight:700;border-radius:10px;padding:9px 14px;cursor:pointer;font:inherit;font-size:14px}
.addrow:hover{background:var(--brand-l)}
.btns{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.btn{border:0;border-radius:11px;padding:13px 22px;font:inherit;font-weight:800;font-size:16px;cursor:pointer;transition:transform .08s,background .15s}
.btn:active{transform:translateY(1px)}
.btn.p{background:var(--cta);color:#fff;box-shadow:0 6px 16px rgba(249,115,22,.35)}.btn.p:hover{background:var(--cta-d)}
.btn.s{background:var(--bg);color:var(--ink);border:1.5px solid var(--line)}.btn.s:hover{border-color:var(--brand)}
.out .ph{display:grid;place-items:center;text-align:center;color:var(--muted);height:100%;min-height:240px}
.out .ph b{display:block;font-size:44px;margin-bottom:8px}
.res .lab{font-size:13px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--brand-d)}
.res .big{font-size:clamp(40px,7vw,60px);font-weight:900;letter-spacing:-1.5px;line-height:1.05;margin:4px 0 4px;color:var(--ink);font-variant-numeric:tabular-nums}
.res .big small{font-size:.4em;font-weight:700;color:var(--muted);letter-spacing:0}
.res .sub2{color:var(--ink2);font-size:15px;margin-bottom:14px}
.res .badge{display:inline-block;padding:4px 12px;border-radius:99px;font-weight:800;font-size:13px;background:var(--brand);color:#fff;margin-bottom:12px}
.res .badge.ok{background:var(--ok)}.res .badge.warn{background:var(--warn)}.res .badge.bad{background:var(--bad)}
.kv{margin:12px 0 0;border-top:1px solid var(--line)}
.kv div{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line);font-size:15px}
.kv dt,.kv span:first-child{color:var(--ink2)}.kv b{font-variant-numeric:tabular-nums;text-align:right}
.bars{margin-top:14px}.bar{margin:9px 0}.bar .bt{display:flex;justify-content:space-between;font-size:13.5px;font-weight:600;margin-bottom:4px}
.bar .tr{height:10px;border-radius:99px;background:var(--line);overflow:hidden}.bar .tr i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),#2dd4bf);border-radius:99px;transition:width .35s}
.rt{width:100%;border-collapse:collapse;margin-top:14px;font-size:14px}
.rt th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);padding:6px 8px;border-bottom:2px solid var(--line)}
.rt td{padding:7px 8px;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
.note{margin-top:14px;font-size:13.5px;color:var(--ink2);background:var(--card);border-left:4px solid var(--brand);padding:10px 12px;border-radius:0 8px 8px 0}
.err{color:var(--bad);font-weight:600;background:rgba(220,38,38,.08);padding:12px 14px;border-radius:10px}
.rbtns{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}.rbtns button{font:inherit;font-size:13.5px;font-weight:700;background:var(--card);border:1.5px solid var(--line);color:var(--ink);border-radius:9px;padding:7px 12px;cursor:pointer}.rbtns button:hover{border-color:var(--brand)}
.chart{margin-top:14px}.chart svg{width:100%;height:auto;display:block}.leg{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;margin-top:6px}.leg i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:6px;vertical-align:-1px}

/* sections */
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:26px 0}
@media (max-width:760px){.trust{grid-template-columns:1fr 1fr}}
.trust div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:14px}.trust b{display:block;font-size:15px}
.sec{margin:34px 0}
.sec>h2,.art h2{font-size:clamp(23px,3vw,30px);letter-spacing:-.4px;line-height:1.2;margin:0 0 14px;scroll-margin-top:84px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;counter-reset:s}
@media (max-width:760px){.steps{grid-template-columns:1fr}}
.steps div{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 18px 18px 64px;position:relative;counter-increment:s}
.steps div:before{content:counter(s);position:absolute;left:16px;top:16px;width:36px;height:36px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;display:grid;place-items:center}
.formula{background:var(--hdr);color:#d7f7f1;border-radius:14px;padding:20px 22px;font:600 16px/1.8 ui-monospace,Menlo,Consolas,monospace;overflow-x:auto}
.formula b{color:#fff}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:30px;align-items:start}
@media (max-width:980px){.layout{grid-template-columns:1fr}}
.art{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px 30px}
@media (max-width:560px){.art{padding:20px}}
.art h3{font-size:19px;margin:24px 0 8px}
.art p,.art li{color:var(--ink2)}.art ul,.art ol{padding-left:22px}
.art table{width:100%;border-collapse:collapse;margin:14px 0;font-size:15px}.art th{background:var(--brand-l);text-align:left;padding:9px 12px}.art td{padding:9px 12px;border-bottom:1px solid var(--line)}
.art .ex{background:var(--brand-l);border-radius:12px;padding:16px 18px;margin:16px 0}
.art .ex b{color:var(--brand-d)}
.toc{position:sticky;top:84px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.toc h4{margin:0 0 8px;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.toc a{display:block;padding:6px 0;color:var(--ink2);font-size:14.5px;border-bottom:1px solid var(--line)}.toc a:last-child{border:0}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:10px;padding:0}
.faq summary{cursor:pointer;font-weight:700;padding:15px 18px;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";font-size:22px;line-height:1;color:var(--brand)}.faq details[open] summary:after{content:"\2212"}
.faq details p{margin:0;padding:0 18px 16px;color:var(--ink2)}
.disc{font-size:13.5px;color:var(--muted);background:var(--card);border:1px dashed var(--line);border-radius:12px;padding:14px 16px;margin:26px 0}
.tools{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.tcard{display:flex;gap:14px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;color:var(--ink);transition:transform .12s,box-shadow .12s,border-color .12s}
.tcard:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--brand);text-decoration:none}
.tcard i{font-style:normal;font-size:26px;width:48px;height:48px;border-radius:12px;background:var(--brand-l);display:grid;place-items:center;flex:none}
.tcard b{display:block;line-height:1.25}.tcard small{color:var(--muted)}
.tcard.soon{opacity:.55;pointer-events:none}
.cat{margin:34px 0 0}.cat h2{display:flex;align-items:center;gap:10px;font-size:24px;margin:0 0 14px}
.ftr{background:var(--hdr);color:#9db6ca;margin-top:56px;padding:40px 0 26px;font-size:14.5px}
.ftr .cols{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:26px}
@media (max-width:760px){.ftr .cols{grid-template-columns:1fr 1fr}}
.ftr h5{color:#fff;margin:0 0 10px;font-size:14px}.ftr a{color:#bfe3f3;display:block;padding:3px 0}
.ftr .copy{border-top:1px solid rgba(255,255,255,.12);margin-top:26px;padding-top:16px;font-size:13px}
.page{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:30px;margin:30px 0}
.page h1{margin-top:0}
@media print{.hdr,.ftr,.hero,.btns,.rbtns,.toc{display:none}.calc{margin:0}}

/* small screens: course rows become stacked cards, nothing wider than the viewport */
.panel>*{min-width:0}
.seg label{white-space:normal}
@media (max-width:640px){
  .rowsw{overflow:visible}
  .rows,.rows tbody{display:block;width:100%}
  .rows thead{display:none}
  .rows tr{display:grid;grid-template-columns:1fr 1fr;gap:8px;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:10px;position:relative}
  .rows td{display:block;width:auto!important;padding:0}
  .rows td:first-child{grid-column:1/-1;padding-right:34px}
  .rows td[data-l]::before{content:attr(data-l);display:block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:3px}
  .rows td:last-child{position:absolute;top:6px;right:4px}
  .rows td:last-child::before{display:none}
}
.seg input:checked+span{display:block}
@media (max-width:640px){
  .rows tr{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .rows td{min-width:0}
  .rows td:nth-child(4){grid-column:1/-1}
}
.ctrl{min-width:0}.ctrl input,.ctrl select,.ctrl textarea{width:100%}
.layout>*{min-width:0}
.art{overflow-wrap:anywhere}
.art table{display:block;max-width:100%;overflow-x:auto}
.art pre,.art code{white-space:pre-wrap}