:root{
  --bg:#f7f8f6;--surface:#ffffff;--surface-2:#f0f3f1;--text:#16211d;--muted:#5a6863;--border:#dfe5e2;
  --brand:#0f766e;--brand-ink:#0b5d56;--brand-soft:#e3f3f0;--accent:#f59e0b;--accent-soft:#fff4dc;
  --money:#0f766e;--home:#b45309;--fit:#be123c;
  --ok:#15803d;--warn:#b45309;--radius:16px;--shadow:0 1px 2px rgba(16,24,20,.05),0 8px 24px rgba(16,24,20,.06);
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --bg:#0d1412;--surface:#141d1a;--surface-2:#1a2521;--text:#e7efec;--muted:#9fb0aa;--border:#25332e;
  --brand:#2dd4bf;--brand-ink:#5eead4;--brand-soft:#123430;--accent:#fbbf24;--accent-soft:#3a2e12;
  --money:#2dd4bf;--home:#f59e0b;--fit:#fb7185;--ok:#4ade80;--warn:#fbbf24;--shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25);color-scheme:dark}}
:root[data-theme=dark]{
  --bg:#0d1412;--surface:#141d1a;--surface-2:#1a2521;--text:#e7efec;--muted:#9fb0aa;--border:#25332e;
  --brand:#2dd4bf;--brand-ink:#5eead4;--brand-soft:#123430;--accent:#fbbf24;--accent-soft:#3a2e12;
  --money:#2dd4bf;--home:#f59e0b;--fit:#fb7185;--ok:#4ade80;--warn:#fbbf24;--shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25);color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--font);font-size:17px;line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
a{color:var(--brand-ink);text-underline-offset:3px}
a:hover{color:var(--brand)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
.skip{position:absolute;left:-999px;top:0;background:var(--surface);padding:.5rem 1rem;z-index:10}
.skip:focus{left:1rem;top:1rem}
.wrap{width:min(1120px,100% - 2.5rem);margin-inline:auto}
.narrow{width:min(760px,100% - 2.5rem);margin-inline:auto}
/* header */
.site-header{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--border)}
.site-header .wrap{display:flex;align-items:center;gap:1rem;min-height:64px}
.logo{display:flex;align-items:center;gap:.55rem;text-decoration:none;color:var(--text);font-weight:800;font-size:1.25rem;letter-spacing:-.02em}
.logo svg{width:34px;height:34px;flex:none}
.logo b{color:var(--brand)}
.nav{margin-left:auto;display:flex;gap:.25rem;align-items:center}
.nav a{text-decoration:none;color:var(--muted);font-weight:600;font-size:.95rem;padding:.45rem .7rem;border-radius:10px}
.nav a:hover,.nav a[aria-current]{color:var(--text);background:var(--surface-2)}
.theme-toggle{border:1px solid var(--border);background:var(--surface);color:var(--text);width:40px;height:40px;border-radius:12px;cursor:pointer;display:grid;place-items:center;margin-left:.25rem}
.theme-toggle svg{width:18px;height:18px}
@media (max-width:720px){.nav a.hide-sm{display:none}.nav a{padding:.4rem .5rem;font-size:.9rem}}
@media (max-width:520px){.nav{display:none}.theme-toggle{margin-left:auto}}
/* hero */
.hero{padding:4.5rem 0 3rem;text-align:center;background:radial-gradient(1200px 400px at 50% -10%,var(--brand-soft),transparent 70%)}
.hero h1{font-size:clamp(2.1rem,5vw,3.4rem);line-height:1.1;letter-spacing:-.035em;margin:.2rem 0 1rem}
.hero h1 span{color:var(--brand)}
.hero p{max-width:640px;margin:0 auto;color:var(--muted);font-size:1.15rem}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand-ink);background:var(--brand-soft);padding:.3rem .7rem;border-radius:999px}
.hero-cta{margin-top:1.8rem;display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:.4rem;font:inherit;font-weight:700;border-radius:12px;padding:.75rem 1.2rem;border:1px solid transparent;cursor:pointer;text-decoration:none;font-size:1rem}
.btn-primary{background:var(--brand);color:#fff}
:root[data-theme=dark] .btn-primary{color:#05201d}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .btn-primary{color:#05201d}}
.btn-primary:hover{filter:brightness(1.08);color:inherit}
.btn-ghost{background:var(--surface);border-color:var(--border);color:var(--text)}
/* sections & cards */
.section{padding:2.5rem 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:1rem;margin-bottom:1.2rem}
.section-head h2{margin:0;font-size:1.6rem;letter-spacing:-.02em}
.section-head a{font-weight:600;font-size:.95rem}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1rem}
.card{position:relative;display:flex;flex-direction:column;gap:.4rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem;text-decoration:none;color:var(--text);box-shadow:var(--shadow);transition:transform .15s ease,border-color .15s ease}
.card:hover{transform:translateY(-2px);border-color:var(--c,var(--brand));color:var(--text)}
.card h3{margin:.3rem 0 0;font-size:1.08rem;letter-spacing:-.01em}
.card p{margin:0;color:var(--muted);font-size:.95rem;line-height:1.5}
.card .go{margin-top:auto;padding-top:.5rem;font-weight:700;color:var(--c,var(--brand));font-size:.92rem}
.icon{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:color-mix(in srgb,var(--c,var(--brand)) 14%,transparent);color:var(--c,var(--brand))}
.icon svg{width:24px;height:24px}
.c-money{--c:var(--money)}.c-home{--c:var(--home)}.c-fit{--c:var(--fit)}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-top:1rem}
.feature{padding:1.2rem;border-radius:var(--radius);background:var(--surface-2)}
.feature h3{margin:0 0 .3rem;font-size:1rem}
.feature p{margin:0;color:var(--muted);font-size:.95rem}
/* breadcrumb */
.crumbs{font-size:.88rem;color:var(--muted);padding:1.2rem 0 0}
.crumbs ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.35rem}
.crumbs li+li::before{content:"›";margin-right:.35rem;color:var(--border)}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--brand)}
/* calc page */
.page-head{padding:.8rem 0 1.2rem}
.page-head h1{font-size:clamp(1.8rem,4vw,2.5rem);line-height:1.15;letter-spacing:-.03em;margin:.3rem 0 .5rem}
.page-head p{margin:0;color:var(--muted);font-size:1.08rem;max-width:720px}
.tool{display:grid;grid-template-columns:1.05fr 1fr;gap:1.2rem;align-items:start}
@media (max-width:860px){.tool{grid-template-columns:1fr}}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.4rem;box-shadow:var(--shadow)}
.panel h2{margin:0 0 1rem;font-size:1.05rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.fields{display:grid;grid-template-columns:1fr 1fr;gap:.9rem}
.fields .full{grid-column:1/-1}
@media (max-width:480px){.fields{grid-template-columns:1fr}}
.field label{display:block;font-weight:650;font-size:.92rem;margin-bottom:.3rem}
.field small{display:block;color:var(--muted);font-size:.8rem;margin-top:.25rem;line-height:1.35}
.input{position:relative;display:flex;align-items:center;background:var(--surface-2);border:1px solid var(--border);border-radius:12px;transition:border-color .15s,box-shadow .15s}
.input:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 20%,transparent)}
.input input,.input select{flex:1;min-width:0;width:100%;font:inherit;font-size:1rem;color:var(--text);background:transparent;border:0;padding:.7rem .8rem;outline:none;appearance:none;-moz-appearance:textfield}
.input select{cursor:pointer;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 18px) 55%,calc(100% - 13px) 55%;background-size:5px 5px;background-repeat:no-repeat;padding-right:2rem}
.input select option{background:var(--surface);color:var(--text)}
.input input::-webkit-outer-spin-button,.input input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.input .pre,.input .suf{color:var(--muted);font-size:.92rem;padding:0 .75rem;white-space:nowrap}
.input .pre{padding-right:0}.input .suf{padding-left:0}
.actions{display:flex;gap:.6rem;margin-top:1.1rem}
.results{position:sticky;top:84px;border-color:color-mix(in srgb,var(--brand) 35%,var(--border));background:linear-gradient(180deg,var(--brand-soft),var(--surface) 55%)}
.result-main{display:flex;flex-direction:column;gap:.15rem;padding-bottom:1rem;margin-bottom:.8rem;border-bottom:1px dashed var(--border)}
.result-label{font-size:.9rem;color:var(--muted);font-weight:600}
.result-value{font-size:clamp(1.9rem,4.5vw,2.6rem);font-weight:800;letter-spacing:-.03em;line-height:1.15;color:var(--brand-ink);font-variant-numeric:tabular-nums}
.result-note{font-size:.95rem;margin-top:.25rem}
.result-grid{margin:0;display:grid;gap:.1rem}
.result-grid div{display:flex;justify-content:space-between;gap:1rem;padding:.5rem 0;border-bottom:1px solid var(--border)}
.result-grid div:last-child{border-bottom:0}
.result-grid dt{color:var(--muted);font-size:.92rem}
.result-grid dd{margin:0;font-weight:700;text-align:right;font-variant-numeric:tabular-nums}
.result-warn{margin:0;padding:.8rem 1rem;border-radius:12px;background:var(--accent-soft);color:var(--text)}
.result-foot{font-size:.88rem;color:var(--muted);margin:.8rem 0 0}
.badge{display:inline-block;padding:.2rem .6rem;border-radius:999px;font-weight:700;font-size:.85rem;background:var(--accent-soft);color:var(--text)}
.badge.ok{background:color-mix(in srgb,var(--ok) 18%,transparent);color:var(--ok)}
.zone-table{width:100%;border-collapse:collapse;font-size:.95rem}
.zone-table th,.zone-table td{text-align:left;padding:.5rem .4rem;border-bottom:1px solid var(--border)}
.zone-table th{color:var(--muted);font-weight:600;font-size:.85rem}
.zone-table td:last-child,.zone-table th:last-child{text-align:right;font-variant-numeric:tabular-nums;font-weight:700}
.zone-table tr.hl td{background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand-ink)}
.notice{margin-top:1rem;font-size:.88rem;color:var(--muted);background:var(--surface-2);border-radius:12px;padding:.8rem 1rem;border-left:4px solid var(--accent)}
/* article */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:2.5rem;margin-top:2.5rem}
@media (max-width:960px){.layout{grid-template-columns:1fr}}
.prose h2{font-size:1.5rem;letter-spacing:-.02em;margin:2.2rem 0 .6rem;line-height:1.25}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:1.12rem;margin:1.5rem 0 .4rem}
.prose p,.prose li{color:var(--text)}
.prose ul,.prose ol{padding-left:1.3rem}
.prose li{margin:.3rem 0}
.formula{font-family:var(--mono);font-size:.95rem;background:var(--surface-2);border:1px solid var(--border);border-radius:12px;padding:1rem 1.1rem;overflow-x:auto;white-space:pre-wrap;line-height:1.7}
.example{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.1rem 1.3rem;margin:1rem 0}
.example p:first-child{margin-top:0}.example p:last-child{margin-bottom:0}
.prose table{width:100%;border-collapse:collapse;font-size:.95rem;margin:1rem 0}
.prose th,.prose td{border-bottom:1px solid var(--border);padding:.55rem .5rem;text-align:left}
.prose th{color:var(--muted);font-size:.85rem}
.faq details{border:1px solid var(--border);border-radius:12px;background:var(--surface);margin:.6rem 0;padding:0 1rem}
.faq summary{cursor:pointer;font-weight:700;padding:.9rem 0;list-style:none;display:flex;justify-content:space-between;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--brand);font-size:1.3rem;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 1rem;color:var(--muted)}
.aside{display:flex;flex-direction:column;gap:1rem}
.aside .box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.2rem;position:sticky;top:84px}
.aside h2{font-size:.85rem;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 .6rem}
.aside ul{list-style:none;margin:0;padding:0}
.aside li a{display:flex;align-items:center;gap:.6rem;padding:.55rem .4rem;border-radius:10px;text-decoration:none;color:var(--text);font-weight:600;font-size:.95rem}
.aside li a:hover{background:var(--surface-2)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--c,var(--brand));flex:none}
.ad-slot{margin:1.5rem 0;min-height:0}
.ad-slot:empty{display:none}
/* footer */
.site-footer{margin-top:4rem;border-top:1px solid var(--border);background:var(--surface);padding:2.5rem 0 1.5rem;font-size:.93rem}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:1.5rem}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}}
.site-footer h2{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 .6rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.35rem 0}
.site-footer a{color:var(--text);text-decoration:none}
.site-footer a:hover{color:var(--brand)}
.site-footer p{color:var(--muted);margin:.6rem 0 0;max-width:340px}
.copy{margin-top:2rem;padding-top:1.2rem;border-top:1px solid var(--border);color:var(--muted);display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem;font-size:.85rem}
.legal h2{margin-top:2rem}
.err{text-align:center;padding:5rem 0 2rem}
.err .code{font-size:clamp(4rem,14vw,7rem);font-weight:900;letter-spacing:-.05em;color:var(--brand);line-height:1}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.site-header,.site-footer,.aside,.ad-slot,.actions{display:none}}