:root{--ink:#17251C;--body:#3F5046;--muted:#4A5A50;--pri:#1F6B45;--pri-d:#14492F;--soft:#F4F7F2;--soft2:#FAFBF9;--line:#E3E8E1;--line2:#D5DED2;--acc:#E9A23B;--acc-ink:#8A5A00}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.6;font-size:17px}
h1,h2,h3,.brand,.ff{font-family:Outfit,system-ui,sans-serif;line-height:1.15;margin:0;letter-spacing:-.3px}
h1{font-size:clamp(32px,5.4vw,54px);font-weight:700}
h2{font-size:clamp(24px,3.2vw,32px);font-weight:700}
h3{font-size:20px;font-weight:600}
a{color:var(--pri)}a:hover{color:var(--pri-d)}
:focus-visible{outline:3px solid var(--acc);outline-offset:2px}
img{max-width:100%;height:auto;display:block}
[hidden]{display:none!important}
.img-missing{visibility:hidden}
.wrap{max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
.skip{position:absolute;left:-9999px;top:0}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 14px;z-index:20;border-radius:8px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* header */
header.site{border-bottom:1px solid var(--line);background:#fff}
.hbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-size:24px;font-weight:700}
.brand:hover{color:var(--ink)}.brand b{color:var(--pri)}
nav.main{display:flex;gap:22px;font-weight:600;font-size:15px;overflow-x:auto;white-space:nowrap;scrollbar-width:none}
nav.main::-webkit-scrollbar{display:none}
nav.main a{color:#2C3B31;text-decoration:none;padding:10px 0}nav.main a:hover{color:var(--pri)}
.btn{border:0;background:var(--pri);color:#fff;font:inherit;font-weight:600;font-size:16px;padding:12px 22px;border-radius:999px;cursor:pointer;min-height:48px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn:hover{background:var(--pri-d);color:#fff}
.btn.ghost{background:#fff;color:var(--pri);border:1px solid var(--line2)}.btn.ghost:hover{background:var(--soft)}
.btn.sm{min-height:42px;padding:9px 18px;font-size:15px}
@media(max-width:900px){.hbar{flex-wrap:wrap;padding-bottom:0}nav.main{order:3;width:100%;border-top:1px solid var(--line);gap:20px}}
@media(max-width:480px){.hbar .btn.sm{padding:8px 14px;font-size:14px}.brand{font-size:21px}}

/* hero */
.hero{background:var(--soft)}
.hero .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(310px,1fr));gap:44px;align-items:center;padding-top:52px;padding-bottom:60px}
.eyebrow{display:inline-block;background:#fff;border:1px solid var(--line2);color:var(--pri);font-weight:600;font-size:13px;padding:6px 14px;border-radius:999px}
.lead{font-size:18px;color:var(--body);max-width:720px;margin:14px 0 0}
.hero .lead{font-size:19px}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.hero-img{position:relative;aspect-ratio:4/3;background:#E7ECE3;border-radius:28px}
.hero-img img{border-radius:28px;width:100%;height:100%;object-fit:cover}
.hero-chip{position:absolute;left:16px;bottom:22px;background:#fff;border:1px solid var(--line2);border-radius:16px;padding:12px 16px;box-shadow:0 10px 30px rgba(23,37,28,.12);display:flex;flex-direction:column;gap:2px;max-width:220px}
.hero-chip strong{font-family:Outfit,system-ui,sans-serif;font-size:26px;line-height:1;color:var(--pri)}
.hero-chip span{font-size:13px;color:var(--muted)}
.stats{display:flex;flex-wrap:wrap;gap:22px;margin-top:26px;font-size:14px;color:var(--muted)}
.stats strong{display:block;font-family:Outfit,system-ui,sans-serif;font-size:22px;color:var(--ink)}

/* sections */
section.block{padding:52px 0}
.alt{background:var(--soft)}
.dark{background:var(--ink);color:#fff}
.dark .lead,.dark p,.dark .sechead p{color:#C9D6CD}
.sechead{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:12px;margin-bottom:24px}
.sechead p{margin:6px 0 0;color:var(--body)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.ccard{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;transition:box-shadow .15s,transform .15s}
.ccard:hover{box-shadow:0 10px 30px rgba(23,37,28,.10);transform:translateY(-2px);color:var(--ink)}
.ccard img{width:100%;aspect-ratio:16/10;object-fit:cover;background:#E7ECE3}
.ccard .cb{padding:16px 18px 18px;display:flex;flex-direction:column;gap:6px;flex:1}
.ccard h3{font-size:20px}.ccard p{margin:0;font-size:15px;color:var(--body);line-height:1.5}
.ccard .go{margin-top:auto;padding-top:6px;font-weight:600;font-size:15px;color:var(--pri)}
.catrow{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px}
.cat{display:grid;grid-template-columns:120px 1fr;gap:16px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px;align-items:start}
.cat img{width:120px;height:120px;object-fit:cover;border-radius:14px;background:#E7ECE3}
.cat h3 a{color:var(--ink);text-decoration:none}.cat h3 a:hover{color:var(--pri)}
.cat ul{list-style:none;margin:8px 0 0;padding:0;display:flex;flex-direction:column;gap:2px}
.cat li a{font-size:15px;text-decoration:none;padding:3px 0;display:inline-block}.cat li a:hover{text-decoration:underline}
@media(max-width:420px){.cat{grid-template-columns:1fr}.cat img{width:100%;height:160px}}
.feats{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.feat{background:#22362A;border:1px solid #33503E;border-radius:18px;padding:20px}
.feat h3{color:#fff;margin-bottom:6px}.feat p{margin:0;font-size:15px}
.split{display:grid;grid-template-columns:repeat(auto-fit,minmax(310px,1fr));gap:40px;align-items:center}
.split img{border-radius:24px;width:100%;aspect-ratio:4/3;object-fit:cover;background:#E7ECE3}

/* page head */
.phead{background:var(--soft)}
.phead .wrap{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:36px;align-items:center;padding-top:8px;padding-bottom:34px}
@media(max-width:820px){.phead .wrap{grid-template-columns:1fr;gap:20px}.phead figure img{aspect-ratio:16/8}}
.phead figure{margin:0;border-radius:22px;background:#E7ECE3}
.phead figure img{border-radius:22px;width:100%;aspect-ratio:3/2;object-fit:cover;background:#E7ECE3}
.phead h1{margin-top:14px}
.meta{font-size:14px;color:var(--muted);margin:14px 0 0;display:flex;flex-wrap:wrap;gap:6px 16px}
.meta span::before{content:"✓ ";color:var(--pri);font-weight:700}
.crumbs{font-size:14px;color:var(--muted);padding:14px 0 0}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li+li::before{content:"›";margin-right:6px}
.crumbs a{color:var(--muted)}

/* layout */
.layout{display:flex;flex-wrap:wrap;gap:36px;padding-top:32px;padding-bottom:20px;align-items:flex-start}
.layout>.main{flex:999 1 600px;min-width:0}
.layout>.side{flex:1 1 280px;min-width:0;display:flex;flex-direction:column;gap:18px}
@media(min-width:1000px){.layout>.side{position:sticky;top:16px}}
.box{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px}
.box h2{font-size:20px;margin-bottom:10px}
.rel{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.rel a{display:grid;grid-template-columns:64px 1fr;gap:12px;align-items:center;text-decoration:none;color:var(--ink);font-weight:600;font-size:15px;line-height:1.3}
.rel a:hover{color:var(--pri)}
.rel img{width:64px;height:48px;object-fit:cover;border-radius:10px;background:#E7ECE3}
.linklist{list-style:none;margin:0;padding:0}.linklist a{display:block;padding:5px 0;font-size:15px;text-decoration:none}.linklist a:hover{text-decoration:underline}

/* calculator */
.calc-card{background:#fff;border:1px solid var(--line2);border-radius:24px;padding:24px;box-shadow:0 12px 36px rgba(23,37,28,.07)}
.calc-card h2{font-size:22px;margin-bottom:16px}
.fgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px 18px}
.fld{border:0;margin:0;padding:0;min-width:0;display:flex;flex-direction:column;gap:6px}
.fld>label,.fld>legend{font-weight:600;font-size:14px;color:#2C3B31;padding:0}
.fld .hint{font-size:13px;color:var(--muted);margin:0}
.fld.wide{grid-column:1/-1}
.inp{display:flex;align-items:center;border:1px solid var(--line2);border-radius:12px;background:#fff;min-height:48px;overflow:hidden}
.inp:focus-within{outline:2px solid var(--pri);outline-offset:1px}
.inp input{flex:1;min-width:0;border:0;font:inherit;font-size:17px;padding:10px 12px;color:var(--ink);background:transparent;outline:none}
.inp .suf{padding:0 12px;color:var(--muted);font-size:14px;white-space:nowrap}
.inp2{display:grid;grid-template-columns:1fr 1fr;gap:8px}
select,input[type=date],input[type=time]{font:inherit;font-size:16px;border:1px solid var(--line2);border-radius:12px;padding:11px 12px;color:var(--ink);background:#fff;min-height:48px;width:100%}
select:focus,input[type=date]:focus,input[type=time]:focus{outline:2px solid var(--pri);outline-offset:1px}
.seg{display:inline-flex;background:var(--soft);border:1px solid var(--line2);border-radius:12px;padding:3px;gap:3px;align-self:flex-start;flex-wrap:wrap}
.seg label{position:relative;cursor:pointer}
.seg input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.seg span{display:block;padding:8px 16px;border-radius:9px;font-size:15px;font-weight:600;color:var(--body);min-height:38px}
.seg input:checked+span{background:#fff;color:var(--pri);box-shadow:0 1px 4px rgba(23,37,28,.12)}
.seg input:focus-visible+span{outline:3px solid var(--acc)}
.seg.sm span{padding:5px 12px;font-size:13px;min-height:30px}
.flabel{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.calc-actions{margin-top:20px}
.calc-actions .btn{width:100%;font-size:17px}
.result{margin-top:20px;border-radius:18px;background:var(--soft);padding:20px;border:1px dashed var(--line2)}
.result.show{background:#fff;border:2px solid var(--pri);animation:pop .25s ease}
@keyframes pop{from{transform:scale(.98);opacity:.6}to{transform:none;opacity:1}}
@media(prefers-reduced-motion:reduce){.result.show{animation:none}.ccard{transition:none}}
.r-empty{margin:0;color:var(--muted);font-size:15px}
.r-big{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px}
.r-num{font-family:Outfit,system-ui,sans-serif;font-weight:700;font-size:clamp(38px,7vw,54px);line-height:1;color:var(--pri)}
.r-unit{font-size:16px;color:var(--muted);font-weight:600}
.r-label{margin:6px 0 10px;font-weight:600;color:var(--body)}
.result p{margin:10px 0 0;font-size:16px}
.r-note{font-size:14px!important;color:var(--muted)}
.r-warn{background:#FFF3DC;color:#6B4700;border-radius:12px;padding:10px 14px;font-size:15px!important}
.r-h{font-size:17px;margin:16px 0 0}
.badge{display:inline-block;font-weight:700;font-size:13px;padding:5px 12px;border-radius:999px;margin:4px 6px 4px 0}
.badge.good{background:#E3F2E8;color:#1F6B45}.badge.warn{background:#FFF3DC;color:#7A4F00}.badge.bad{background:#FDE7E4;color:#B42318}.badge.info{background:#E6F0FA;color:#1D4E89}
.gauge{position:relative;margin:16px 0 6px;padding-top:6px}
.g-bar{display:flex;height:26px;border-radius:999px;overflow:hidden}
.g-seg{display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#17251C;overflow:hidden;white-space:nowrap}
.g-seg.info{background:#A9D0EC}.g-seg.good{background:#9CCB86}.g-seg.warn{background:#F5D77A}.g-seg.bad{background:#EE9A8C}
.g-mark{position:absolute;top:0;width:4px;height:38px;margin-left:-2px;background:#17251C;border-radius:2px;box-shadow:0 0 0 2px #fff}
.g-leg{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:12px;color:var(--muted);margin-top:6px}.g-leg i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px;vertical-align:-1px}
.g-leg i.info{background:#A9D0EC}.g-leg i.good{background:#9CCB86}.g-leg i.warn{background:#F5D77A}.g-leg i.bad{background:#EE9A8C}
.macro-bar{display:flex;height:14px;border-radius:999px;overflow:hidden;margin:12px 0}
.mc{background:#E9A23B}.mp{background:#1F6B45}.mf{background:#8FC1E3}
.r-table,.tw{overflow-x:auto;margin-top:12px}
.r-table table,table.t{border-collapse:collapse;width:100%;font-size:15px;background:#fff}
.r-table th,.r-table td,table.t th,table.t td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.r-table thead th,table.t thead th{background:var(--soft);font-size:13px;text-transform:uppercase;letter-spacing:.4px;color:var(--muted)}
.r-table tbody th,table.t tbody th{font-weight:600}
.r-table tr.hi th,.r-table tr.hi td{background:#EAF3EC}

/* prose */
.prose{max-width:780px;margin-top:40px}
.prose h2{margin:36px 0 12px}.prose h3{margin:20px 0 6px}
.prose p,.prose li{color:var(--body)}.prose p{margin:0 0 14px}
.prose ul,.prose ol{padding-left:22px}.prose li{margin-bottom:6px}
.formula{background:var(--soft);border-left:0;border-radius:14px;padding:14px 18px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:15px;color:var(--ink)!important;line-height:1.7;overflow-x:auto}
.faq details{border:1px solid var(--line);border-radius:14px;padding:14px 18px;margin-bottom:10px;background:#fff}
.faq summary{font-weight:600;cursor:pointer;color:var(--ink)}
.faq details p{margin:10px 0 0}
.sources{font-size:14px}.sources li{color:var(--muted)}
.disc{background:#FFF8EA;border:1px solid #F3DDB0;border-radius:16px;padding:16px 18px;font-size:15px;color:#5C4300;margin-top:28px}
.disc strong{color:#3D2C00}
.updated{font-size:14px;color:var(--muted)}

/* footer */
footer.site{background:var(--ink);color:#C9D6CD;margin-top:56px}
footer .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:26px;padding:48px 0 24px}
footer .fh{font-size:15px;font-weight:700;color:#fff;margin:0 0 8px}
footer a{color:#C9D6CD;text-decoration:none;display:block;padding:3px 0;font-size:14px}
footer a:hover{color:#fff;text-decoration:underline}
footer .about{font-size:14px;line-height:1.6;margin:10px 0 0}
footer .brand{color:#fff;font-size:22px}footer .brand b{color:var(--acc)}
footer .copy{border-top:1px solid #33503E;padding:16px 0 28px;font-size:13px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px}
footer .copy a{display:inline;padding:0}