:root{--ink:#232838;--muted:#5b6779;--paper:#f3f5f7;--card:#fff;--line:#dde2e9;--blue:#33569b;--tint:#edf2fb;--coral:#bb503d;--ok:#32614d}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--blue);text-underline-offset:3px}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}button,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline-color:var(--blue)}:focus-visible{outline:3px solid var(--blue);outline-offset:3px}[hidden]{display:none!important}h1,h2,h3,p{margin-top:0}h1,h2{font-family:Georgia,"Times New Roman",serif;line-height:1.15}h1{font-size:clamp(2rem,5vw,3.3rem);letter-spacing:-.035em;margin-bottom:18px}h2{font-size:1.65rem}h3{font-size:1.05rem}p{margin-bottom:16px}small,.hint{color:var(--muted);font-size:.86rem}.skip{position:absolute;left:16px;top:-100px;padding:12px;background:var(--card);z-index:4}.skip:focus{top:8px}.nav{max-width:1100px;margin:auto;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand{display:flex;align-items:center;text-decoration:none;color:var(--ink);font:bold 24px Georgia,serif}.brand i{color:var(--blue);font-style:normal}.cmark{height:32px;width:32px;color:var(--blue);margin-right:8px}.nav-links{display:flex;gap:20px;align-items:center}.nav-links a{font-size:14px;font-weight:600;text-decoration:none;padding:8px 0}.nav-links .studio{padding:9px 15px;border:1px solid var(--line);border-radius:10px;background:var(--card)}main{max-width:1050px;margin:30px auto 0;padding:0 24px 64px}.intro{max-width:770px;margin-bottom:30px}.eyebrow{display:inline-flex;gap:7px;color:var(--blue);font-size:12px;letter-spacing:.09em;font-weight:700;text-transform:uppercase;margin-bottom:14px}.lede{max-width:660px;color:var(--muted);font-size:1.08rem}.trust{display:flex;flex-wrap:wrap;gap:8px 22px;color:var(--muted);font-size:13px}.trust span:before{content:"✓ ";color:var(--ok)}.workspace{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:24px;align-items:start}.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:26px;min-width:0}.form-title{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:20px}.form-title h2{font-size:1.4rem;margin:0}.badge{color:var(--blue);font-size:12px;font-weight:650;background:var(--tint);border-radius:30px;padding:5px 10px;white-space:nowrap}.fields{display:grid;grid-template-columns:1fr 1fr;gap:18px 14px}.field{min-width:0}.field.full{grid-column:1/-1}label{display:block;font-size:14px;font-weight:650;margin-bottom:6px}input,select,textarea{width:100%;border:1px solid #aeb8c7;border-radius:10px;color:var(--ink);background:var(--card);padding:11px 12px;min-height:48px}input{font-variant-numeric:tabular-nums}textarea{line-height:1.6;resize:vertical;min-height:220px;overflow-wrap:anywhere}label small{display:block;font-weight:400;margin-top:3px}.field .hint{display:block;margin:6px 0 0;font-size:12px}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;min-height:46px;border-radius:10px;padding:10px 16px;font-weight:650;font-size:14px;text-decoration:none;border:1px solid var(--line);background:var(--card);color:var(--blue)}.primary{background:var(--blue);color:#fff;border-color:var(--blue)}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.actions .primary{flex:1}.error{color:#922b2b;background:#fff0ef;padding:12px;border:1px solid #f0c7c1;border-radius:10px;margin:14px 0 0}.result{background:var(--tint);border-color:#cad7ed}.result h2{font-size:1.5rem}.result .empty{color:var(--muted);padding:12px 0}.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}.choice{padding:17px;border:1px solid var(--line);border-radius:14px;background:var(--card)}.choice.nearest{border:2px solid var(--blue);padding:16px}.choice .number{display:block;font-size:36px;font-weight:750;line-height:1.3;font-variant-numeric:tabular-nums}.choice p{font-size:13px;margin:8px 0 0}.choice .badge{font-size:11px}.equation{display:block;color:var(--muted);font-size:13px;margin-top:12px}.note{font-size:13px;border-left:3px solid #d5a24b;padding:2px 0 2px 12px;margin:20px 0 0;color:var(--muted)}.ledger{display:flex;gap:15px;align-items:center;flex-wrap:wrap;margin:18px 0}.ledger strong{font-size:32px}.ledger span{font-size:13px;color:var(--muted);display:block}.ledger .arrow{font-size:24px;color:var(--blue)}.instruction{font-size:17px;background:var(--card);border:1px solid var(--line);padding:16px;border-radius:12px;overflow-wrap:anywhere;max-height:260px;overflow:auto}.check{color:var(--ok);font-size:13px;font-weight:600}.blocks{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}.block{padding:6px 9px;border:1px solid #becde7;border-radius:7px;background:#fff;color:var(--blue);font-size:12px}.result details{font-size:13px;margin:16px 0}summary{cursor:pointer;min-height:44px;padding:10px 0;font-weight:600}ol.steps{max-height:280px;overflow:auto;padding-left:26px}ol.steps li{padding:4px 0}.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin:44px 0}.help-grid h2{font-size:1.5rem}.help-grid p,.help-grid li{color:var(--muted);font-size:14px}.help-grid li{margin-bottom:9px}.help-grid ul,.help-grid ol{padding-left:22px}.links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:28px 0}.tool-link{display:block;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;color:var(--ink);text-decoration:none}.tool-link:hover{border-color:var(--blue)}.tool-link .icon{display:inline-flex;min-width:44px;min-height:44px;align-items:center;justify-content:center;background:var(--tint);border-radius:12px;color:var(--blue);font-size:22px;margin-bottom:18px}.tool-link h2,.tool-link h3{font:700 20px/1.25 Georgia,serif;margin-bottom:10px}.tool-link p{font-size:14px;color:var(--muted);margin-bottom:14px}.tool-link .go{color:var(--blue);font-size:14px;font-weight:600}.next-step{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;display:flex;gap:24px;align-items:center;justify-content:space-between;margin:30px 0}.next-step p{margin:5px 0 0;font-size:14px;color:var(--muted)}.next-step h2{font-size:1.4rem;margin:0}.next-step .secondary{flex-shrink:0}footer{max-width:1050px;margin:auto;padding:24px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}footer a{margin-right:12px}.status{min-height:24px;color:var(--muted);font-size:13px;margin-top:10px}.terms-table{width:100%;border-collapse:collapse;font-size:14px}.terms-table td,.terms-table th{text-align:left;border-bottom:1px solid var(--line);padding:11px 8px}.terms-table caption{text-align:left;font-size:13px;color:var(--muted);margin-bottom:10px}.converted{min-height:250px;background:#fff}.related-title{font-size:1.4rem;margin-top:40px}.noscript{padding:15px;border:1px solid #d5a24b;border-radius:12px;background:#fff7e6;margin:18px 0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
@media(max-width:740px){.workspace{grid-template-columns:1fr}.links{grid-template-columns:1fr}.help-grid{grid-template-columns:1fr;gap:22px}.nav{padding:14px 18px;gap:10px}.nav-links{gap:12px}.nav-links a{font-size:13px}.nav-links .studio{padding:8px 11px}.brand{font-size:22px}main{padding:0 18px 40px;margin-top:20px}.card{padding:21px}.next-step{flex-direction:column;align-items:flex-start;gap:15px}.next-step .secondary{width:100%}.tool-link{padding:20px}.tool-link .icon{margin-bottom:12px}.help-grid{margin-top:30px}}
@media(max-width:360px){.nav-links a[href="/learn"]{display:none}.choices{grid-template-columns:1fr}.fields{gap:15px 10px}.card{padding:17px}.nav{padding:12px 15px}main{padding:0 15px 35px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
/* Keep the task and its fields in view; reference material opens on request. */
.nav-links a[href="/tools"]{color:var(--blue);font-weight:750}
.tool-link{display:flex;flex-direction:column}
.tool-link .go{margin-top:auto}
.tool-example{display:block;font-size:12px;color:var(--muted);margin:0 0 18px;line-height:1.5}
body[data-tool]:not([data-tool=""]) main{margin-top:12px}
body[data-tool]:not([data-tool=""]) .intro{margin-bottom:22px}
body[data-tool]:not([data-tool=""]) .intro h1{font-size:clamp(1.8rem,4vw,2.5rem);margin-bottom:10px}
body[data-tool]:not([data-tool=""]) .intro .eyebrow{margin-bottom:8px;font-size:12px;letter-spacing:0;text-transform:none;min-height:40px;align-items:center}
body[data-tool]:not([data-tool=""]) .intro .lede{font-size:1rem;margin-bottom:10px}
.help-panel{border:1px solid var(--line);border-radius:14px;padding:4px 18px;align-self:start;background:var(--card)}
.help-panel>summary{font-size:15px;min-height:48px;padding:12px 0}
.help-content{padding:8px 0 12px}
.help-content p:last-child{margin-bottom:0}
.form-title{flex-wrap:wrap;gap:8px;margin-bottom:16px}
.fields select{min-width:0;max-width:100%}
@media(max-width:740px){body[data-tool]:not([data-tool=""]) main{margin-top:8px}body[data-tool]:not([data-tool=""]) .intro{margin-bottom:18px}.intro h1{font-size:2rem}.intro .eyebrow{letter-spacing:0}.nav-links{flex-wrap:wrap}.nav-links a{min-height:44px;display:inline-flex;align-items:center}.tool-link h3{margin-bottom:8px}.tool-link .icon{min-width:44px;font-size:18px}.tool-example{margin-bottom:12px}}
@media print{.nav,.actions,.next-step,.links,footer,.status,form,.intro .trust{display:none!important}main{margin:0;padding:0;max-width:none}.workspace,.help-grid{display:block}.card{border:1px solid #aaa;box-shadow:none;background:#fff}.result[hidden]{display:none}body{background:#fff;color:#000}.help-grid{page-break-before:auto}.instruction{max-height:none;overflow:visible}}

@media(max-width:480px){.choices{grid-template-columns:1fr}.choice{min-width:0}}

/* Measured planning remains on the existing chain calculator. */
fieldset{min-width:0;border:1px solid var(--line);border-radius:12px;margin:18px 0;padding:16px}legend{font-weight:650;font-size:15px;padding:0 6px}.checkbox-label{display:flex;gap:10px;align-items:center;min-height:44px;font-weight:400}.checkbox-label input{width:20px;min-height:20px;flex:0 0 20px}.plan-choice{background:var(--card)}#planMode{margin-bottom:18px}.field .hint,.note,.status{font-size:14px}#measurementFields details{margin-top:12px}#measurementFields .fields{margin-top:12px}