:root{--ink:#071735;--muted:#58708f;--green:#15965f;--green-dark:#087a49;--line:#dfe7ef;--wash:#f5f9fc;--card:#fff;--shadow:0 12px 38px rgba(22,48,76,.09);--radius:16px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:#fff;font:16px/1.55 "DM Sans",system-ui,sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}.skip{position:fixed;top:-60px;left:12px;padding:10px;background:var(--ink);color:#fff;z-index:20}.skip:focus{top:12px}.header{height:76px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 max(24px,calc((100vw - 1240px)/2));gap:16px}.brand{display:flex;align-items:center;gap:10px;font-size:25px;font-weight:700;letter-spacing:-1px}.mark{display:grid;place-items:center;width:39px;height:39px;border-radius:50%;background:linear-gradient(145deg,#2cb377,#0c8051);color:#fff;font:700 29px Georgia}.nav{display:flex;gap:28px;margin-left:auto;font-size:14px;font-weight:600}.nav a[aria-current]{color:var(--green)}.container{width:min(1120px,calc(100% - 40px));margin:auto}.hero{padding:76px 0 64px;background:radial-gradient(circle at 84% 30%,#e4f4ec 0 6%,transparent 25%),linear-gradient(130deg,#f3f9ff,#fff 60%)}.eyebrow{margin:0 0 12px;color:var(--green);text-transform:uppercase;letter-spacing:.11em;font-size:13px;font-weight:700}.hero h1{max-width:760px;margin:0 0 18px;font-size:52px;line-height:1.04;letter-spacing:-2px}.hero p{max-width:680px;margin:0;color:var(--muted);font-size:20px}.section{padding:64px 0}.section.soft{background:var(--wash)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px}.section h2{margin:0 0 5px;font-size:30px;letter-spacing:-.8px}.section-head p{margin:0;color:var(--muted)}.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}.card{display:flex;flex-direction:column;min-height:265px;padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);box-shadow:0 5px 20px rgba(18,41,65,.04);transition:.2s}.card:hover{transform:translateY(-3px);border-color:#bcdccc;box-shadow:var(--shadow)}.icon{width:56px;height:56px;display:grid;place-items:center;border-radius:50%;background:#e4f5ec;color:var(--green);font-size:26px;font-weight:700}.card h3{font-size:22px;margin:20px 0 8px}.card p{color:var(--muted);margin:0 0 22px}.card .go{margin-top:auto;color:var(--green-dark);font-weight:700}.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}.principles h3{font-size:17px;margin:12px 0 5px}.principles p{margin:0;color:var(--muted);font-size:14px}.footer{padding:32px 0;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
.tool-hero{padding:44px 0 32px;background:linear-gradient(130deg,#f3f9ff,#fff)}.crumbs{font-size:13px;color:var(--muted);margin-bottom:20px}.crumbs a{color:var(--green-dark)}.tool-hero h1{font-size:42px;line-height:1.1;letter-spacing:-1.5px;margin:0 0 12px}.tool-hero p{font-size:18px;color:var(--muted);max-width:720px;margin:0}.calculator-layout{display:grid;grid-template-columns:minmax(0,1fr) 390px;gap:34px;align-items:start;padding:44px 0 70px}.panel{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:28px;box-shadow:0 5px 24px rgba(18,41,65,.05)}.panel h2{font-size:22px;margin:0 0 22px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:20px}.field{display:grid;gap:7px}.field.full{grid-column:1/-1}.field label{font-size:14px;font-weight:700}.field small{color:var(--muted);font-size:12px}.input-wrap{position:relative}.input-wrap span{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--muted);font-weight:600}.input-wrap input,.field>input{width:100%;height:48px;border:1px solid #cbd8e5;border-radius:8px;padding:0 13px;color:var(--ink);background:#fff}.input-wrap input{padding-left:34px}.input-wrap.suffix input{padding-left:13px;padding-right:38px}.input-wrap.suffix span{left:auto;right:13px}.input-wrap input:focus,.field>input:focus{outline:3px solid rgba(21,150,95,.16);border-color:var(--green)}.error{min-height:20px;margin:14px 0 0;color:#a82d2d;font-size:13px}.calculate{width:100%;height:50px;margin-top:10px;border:0;border-radius:8px;background:linear-gradient(145deg,#25a86e,var(--green-dark));color:#fff;font-weight:700;cursor:pointer}.result{position:sticky;top:22px;background:linear-gradient(145deg,#0b7f4d,#15965f);color:#fff;border:0}.result .label{font-size:14px;opacity:.82}.result .big{font-size:43px;line-height:1.1;letter-spacing:-1.5px;font-weight:700;margin:5px 0 22px}.stats{display:grid;gap:0;border-top:1px solid rgba(255,255,255,.25)}.stat{display:flex;justify-content:space-between;gap:15px;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.2);font-size:14px}.stat strong{text-align:right}.result-note{font-size:12px;opacity:.78;margin:18px 0 0}.method{grid-column:1/-1;padding:26px 28px;background:var(--wash);border-radius:var(--radius)}.method h2{font-size:20px;margin:0 0 9px}.method p,.method li{color:var(--muted);font-size:14px}.method p{margin:0}.method ul{margin:12px 0 0;padding-left:20px}.method .warning{margin-top:15px;padding-top:15px;border-top:1px solid var(--line);font-weight:600;color:#405776}
@media(max-width:760px){.header{height:68px}.nav a:not([aria-current]){display:none}.hero{padding:52px 0}.hero h1{font-size:40px}.hero p{font-size:17px}.cards,.principles,.calculator-layout{grid-template-columns:1fr}.calculator-layout{gap:22px;padding-top:28px}.result{position:static;grid-row:2}.method{grid-row:3}.fields{grid-template-columns:1fr}.field.full{grid-column:auto}.tool-hero h1{font-size:34px}.panel{padding:22px}.section{padding:48px 0}}
@media(max-width:430px){.container{width:min(100% - 28px,1120px)}.brand{font-size:22px}.mark{width:35px;height:35px}.nav{font-size:13px}.hero h1{font-size:35px}.section h2{font-size:26px}.card{padding:22px}.tool-hero h1{font-size:31px}.result .big{font-size:37px}}
.cards{grid-template-columns:repeat(3,1fr)}
.notice{margin-top:28px;padding:16px 18px;border:1px solid #e7c979;border-radius:12px;background:#fff9e8;color:#604b16;font-size:14px}.comparison{grid-column:1/-1;padding:26px 28px;border:1px solid var(--line);border-radius:var(--radius)}.comparison h2{margin:0 0 4px;font-size:20px}.comparison>p{margin:0 0 18px;color:var(--muted);font-size:14px}.table-wrap{max-height:390px;overflow:auto;border:1px solid var(--line);border-radius:10px}table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}th,td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:right;font-size:14px}th:first-child,td:first-child{text-align:left}th{position:sticky;top:0;background:var(--wash);color:#405776}tbody tr:last-child td{border-bottom:0}
@media(max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.cards{grid-template-columns:1fr}.comparison{padding:20px 16px}}
.mode-switch{display:flex;flex-wrap:wrap;gap:10px 18px;margin:0 0 22px;padding:0;border:0}.mode-switch legend{width:100%;margin-bottom:7px;font-weight:700;font-size:14px}.mode-switch label{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:14px}.mode-switch input{accent-color:var(--green)}.is-hidden{display:none}
.review-meta{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:18px;color:var(--muted);font-size:13px}.review-meta span+span:before{content:"•";margin-right:18px}.explainer{line-height:1.7}.explainer h2{margin-top:28px}.explainer h2:first-child{margin-top:0}.explainer a{color:var(--green-dark);text-decoration:underline;text-underline-offset:3px}
.field label:has(>input){display:grid;gap:7px}.field>label>input{width:100%;height:48px;border:1px solid #cbd8e5;border-radius:8px;padding:0 13px}.check-form{display:grid;gap:14px}.check-form>label{display:flex;gap:10px;align-items:flex-start}.check-form input{margin-top:5px;accent-color:var(--green)}.result .big.compact{font-size:30px}

/* Shared tool accessibility safeguards. */
body{overflow-wrap:anywhere}:where(a,button,input,select,textarea,[tabindex]):focus-visible{outline:3px solid #075f3d;outline-offset:3px;border-radius:4px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}.card:hover{transform:none}}