:root{
  --bg:#f6f3ec;--surface:#ffffff;--ink:#1b2420;--muted:#5d6762;--line:#e4dfd3;
  --brand:#1f4d3a;--brand-2:#2f6f4f;--brand-ink:#ffffff;--accent:#d9813b;--accent-soft:#fbeee2;
  --tint:#eaf2ec;--warn:#9a5b00;--panel:#122f24;--radius:16px;
  --shadow:0 1px 2px rgba(27,36,32,.05),0 8px 24px -8px rgba(27,36,32,.12);
  --display:"Bricolage Grotesque",system-ui,sans-serif;
  --body:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#101513;--surface:#18201c;--ink:#e9eeea;--muted:#a1aca6;--line:#29332e;
  --brand:#14352a;--brand-2:#7fd1a5;--brand-ink:#ffffff;--accent:#f0a160;--accent-soft:#2b2119;
  --tint:#1c2a23;--warn:#f0bf6a;--panel:#0b1f17;--shadow:0 1px 2px rgba(0,0,0,.3)}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--body);-webkit-font-smoothing:antialiased}
a{color:var(--brand-2);text-underline-offset:3px}
h1,h2,h3{font-family:var(--display);letter-spacing:-.01em;line-height:1.15}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}

/* Header */
header.site{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font:700 1.15rem var(--display);color:var(--ink);text-decoration:none}
.brand svg{width:32px;height:32px}
nav.top{display:flex;gap:4px;align-items:center}
nav.top a{color:var(--muted);text-decoration:none;font-size:.92rem;font-weight:500;padding:8px 12px;border-radius:999px}
nav.top a:hover{color:var(--ink);background:var(--tint)}
nav.top a.cta{background:var(--brand);color:var(--brand-ink)}
nav.top a.cta:hover{background:var(--brand-2);color:#fff}
@media (max-width:760px){nav.top a:not(.cta){display:none}}

/* Hero bands */
.hero{background:var(--brand);color:#fff;position:relative;overflow:hidden}
.hero .wrap{position:relative;padding-top:40px;padding-bottom:48px}
.hero h1{font-size:clamp(2rem,5.2vw,3.4rem);margin:0 0 14px;max-width:16ch}
.hero p.lede{color:rgba(255,255,255,.82);font-size:clamp(1rem,2vw,1.18rem);max-width:56ch;margin:0 0 24px}
.hero .crumbs,.hero .crumbs a{color:rgba(255,255,255,.7)}
.hero .layers{position:absolute;right:-40px;bottom:-10px;width:min(520px,60vw);opacity:.95;pointer-events:none}
@media (max-width:760px){.hero .layers{display:none}.section-head{flex-direction:column;align-items:start;gap:4px}}
.hero.slim .wrap{padding-top:22px;padding-bottom:30px}
.hero.slim h1{font-size:clamp(1.8rem,4.4vw,2.6rem);max-width:none;display:flex;align-items:center;gap:14px}
.hero.slim h1 .ico{flex:none;width:52px;height:52px;border-radius:14px;background:rgba(255,255,255,.12);display:grid;place-items:center}
.hero.slim h1 .ico svg{width:30px;height:30px;color:#fff}
.hero.slim p.lede{margin-bottom:0}
.crumbs{font-size:.85rem;margin:0 0 14px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{background:rgba(255,255,255,.12);color:#fff;text-decoration:none;padding:8px 14px;border-radius:999px;font-size:.92rem;font-weight:500;border:1px solid rgba(255,255,255,.18)}
.chips a:hover{background:rgba(255,255,255,.22)}

/* Calculator */
.calc-wrap{margin-top:-24px;position:relative;z-index:2}
.calc-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:18px}
@media (min-width:920px){.calc-grid{grid-template-columns:minmax(0,1fr) 360px;align-items:start}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.calc h2.step{font:600 .78rem var(--body);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 12px}
.calc .row{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-bottom:14px}
.calc label{display:block;font-size:.86rem;font-weight:600;margin-bottom:6px}
.calc input,.calc select{width:100%;font:inherit;font-size:1rem;padding:11px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);transition:border-color .15s}
.calc input:hover,.calc select:hover{border-color:color-mix(in srgb,var(--brand-2) 40%,var(--line))}
.calc input:focus,.calc select:focus{outline:none;border-color:var(--brand-2);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand-2) 22%,transparent)}
.unit{display:flex;align-items:stretch}
.unit input{border-top-right-radius:0;border-bottom-right-radius:0}
.unit span{display:flex;align-items:center;padding:0 12px;border:1.5px solid var(--line);border-left:0;border-radius:0 10px 10px 0;background:var(--tint);color:var(--muted);font-size:.85rem;font-weight:500;white-space:nowrap}
.hint{font-size:.78rem;color:var(--muted);margin-top:4px}
.hidden{display:none!important}
.diagram{color:var(--muted);margin:4px 0 0;border-top:1px dashed var(--line);padding-top:12px}
.diagram svg{display:block;width:100%;max-width:420px;height:auto;margin:0 auto}
.diagram .dl{font:600 12px var(--body);fill:var(--muted)}

/* Result panel */
.result{background:var(--panel);color:#fff;border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);padding:22px;box-shadow:0 18px 40px -18px rgba(10,30,22,.55)}
@media (min-width:920px){.result{position:sticky;top:84px}}
.result h2{font:600 .78rem var(--body);text-transform:uppercase;letter-spacing:.08em;color:rgba(255,255,255,.7);margin:0 0 12px}
.big{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.stat{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:12px 14px}
.stat b{display:block;font:700 1.3rem/1.2 var(--display)}
.stat small{color:rgba(255,255,255,.72);font-size:.8rem}
.big .stat:first-child{grid-column:1/-1;background:var(--accent);border-color:transparent;padding:16px 18px}
.big .stat:first-child b{font-size:2.3rem}
.big .stat:first-child small{color:rgba(255,255,255,.92);font-size:.9rem}
.more{margin:14px 0 0;padding:0;list-style:none;font-size:.88rem;color:rgba(255,255,255,.78)}
.more li{padding:4px 0;border-top:1px solid rgba(255,255,255,.1)}
.more a{color:#fff}
.result .note{color:#ffd9a8!important}
.result-actions{display:flex;gap:8px;margin-top:14px}
.btn{font:600 .88rem var(--body);border-radius:999px;padding:9px 16px;border:1px solid rgba(255,255,255,.3);background:transparent;color:#fff;cursor:pointer}
.btn:hover{background:rgba(255,255,255,.12)}
.tip{font-size:.8rem;color:rgba(255,255,255,.6);margin:12px 0 0}

/* Article */
.content{display:grid;grid-template-columns:minmax(0,1fr);gap:32px;margin-top:40px}
@media (min-width:920px){.content{grid-template-columns:minmax(0,1fr) 360px}}
.prose{max-width:70ch}
.prose h2{font-size:1.6rem;margin:40px 0 12px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:1.15rem;margin:24px 0 8px}
.prose ul{padding-left:20px}
.prose li{margin:4px 0}
.prose table{border-collapse:separate;border-spacing:0;width:100%;margin:14px 0;font-size:.94rem;display:block;overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.prose th,.prose td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line)}
.prose tr:last-child td{border-bottom:0}
.prose th{background:var(--tint);font-weight:600;font-size:.86rem}
.formula{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--accent);padding:14px 16px;border-radius:12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9rem;line-height:1.8;overflow-x:auto}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:0 16px;margin:8px 0}
.faq summary{cursor:pointer;font-weight:600;padding:14px 28px 14px 0;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:10px;font-size:1.4rem;color:var(--brand-2);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0 0 14px;color:var(--muted)}
.note{font-size:.84rem;color:var(--muted);margin-top:16px}
.related h2{font-size:1.1rem;margin:0 0 12px}
.related .card{padding:18px}
@media (min-width:920px){.related{position:sticky;top:84px}}
.mini{display:flex;align-items:center;gap:12px;padding:10px;border-radius:12px;text-decoration:none;color:var(--ink)}
.mini:hover{background:var(--tint)}
.mini .ico{flex:none;width:40px;height:40px;border-radius:10px;background:var(--tint);color:var(--brand-2);display:grid;place-items:center}
.mini .ico svg{width:24px;height:24px}
.mini span{font-weight:600;font-size:.95rem}

/* Home */
.section{margin:56px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:18px}
.section-head h2{font-size:clamp(1.5rem,3vw,2rem);margin:0}
.section-head p{margin:0;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.tile{display:flex;flex-direction:column;gap:10px;text-decoration:none;color:var(--ink);transition:transform .15s,box-shadow .15s,border-color .15s}
.tile:hover{transform:translateY(-3px);border-color:var(--brand-2)}
.tile .ico{width:52px;height:52px;border-radius:14px;background:var(--tint);color:var(--brand-2);display:grid;place-items:center}
.tile .ico svg{width:30px;height:30px}
.tile strong{font:700 1.15rem var(--display)}
.tile span{color:var(--muted);font-size:.93rem}
.tile em{font-style:normal;color:var(--brand-2);font-weight:600;font-size:.9rem;margin-top:auto}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;counter-reset:s}
.steps .card{position:relative;padding-top:56px}
.steps .card::before{counter-increment:s;content:counter(s);position:absolute;top:18px;left:22px;width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font:700 .95rem/30px var(--display);text-align:center}
.steps h3{margin:0 0 6px;font-size:1.1rem}
.steps p{margin:0;color:var(--muted);font-size:.95rem}
.band{background:var(--accent-soft);border-radius:var(--radius);padding:28px;display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.band b{display:block;font:700 1.6rem var(--display);color:var(--accent)}
.band span{color:var(--muted);font-size:.93rem}

/* Footer */
footer.site{margin-top:72px;background:var(--brand);color:rgba(255,255,255,.75);padding:40px 0;font-size:.9rem}
footer.site .cols{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
footer.site h3{color:#fff;font-size:1rem;margin:0 0 10px}
footer.site a{color:rgba(255,255,255,.8);text-decoration:none;display:block;padding:3px 0}
footer.site a:hover{color:#fff}
footer.site .fine{margin-top:28px;padding-top:18px;border-top:1px solid rgba(255,255,255,.15);font-size:.82rem}
.static{margin-top:32px}
@media print{header.site,footer.site,.related,.result-actions,.hero .layers{display:none}.hero{background:none;color:#000}.result{background:none;color:#000;border:1px solid #999}}

/* Mobile result bar */
.mbar{position:fixed;left:12px;right:12px;bottom:12px;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--panel);color:#fff;border-radius:14px;padding:10px 12px 10px 16px;box-shadow:0 10px 30px rgba(0,0,0,.3);transition:transform .2s,opacity .2s}
.mbar b{font:700 1.25rem var(--display);display:block;line-height:1.1}
.mbar small{color:rgba(255,255,255,.7);font-size:.78rem}
.mbar a{background:var(--accent);color:#fff;text-decoration:none;font-weight:600;font-size:.88rem;padding:9px 14px;border-radius:999px;white-space:nowrap}
.mbar.off{transform:translateY(140%);opacity:0}
@media (min-width:920px){.mbar{display:none}}
@media print{.mbar{display:none}}
@media (max-width:760px){
  .section-head{flex-direction:column;align-items:flex-start;gap:4px}
  .calc .row>div:has(select){grid-column:1/-1}
}