:root{
  --ink:#17324d;
  --ink-2:#29465f;
  --accent:#d96f32;
  --accent-dark:#b85522;
  --soft:#f5f7f9;
  --soft-warm:#fbf6f1;
  --text:#343b42;
  --muted:#66717c;
  --border:#dfe5ea;
  --success:#176b57;
  --white:#fff;
  --max:1120px;
  --reading:760px;
  --shadow:0 12px 28px rgba(23,50,77,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--white);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.58;-webkit-font-smoothing:antialiased}
a{color:var(--ink);text-decoration-thickness:.08em;text-underline-offset:.18em}
a:hover{color:var(--accent-dark)}
img,svg{max-width:100%}
button,input{font:inherit}
button{cursor:pointer}
.site-header{border-bottom:1px solid var(--border);background:rgba(255,255,255,.97)}
.header-inner,.footer-inner,.wrap{max-width:var(--max);margin:0 auto;padding-left:24px;padding-right:24px}
.header-inner{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:850;font-size:1.3rem;letter-spacing:-.02em}
.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--ink);color:#fff;font-weight:900;letter-spacing:-.08em}
.brand-mark span{color:#ffd8c0}
.main-nav{display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.main-nav a{font-weight:700;text-decoration:none;color:var(--ink);font-size:.96rem}
.main-nav a[aria-current="page"]{color:var(--accent-dark)}
main{min-height:60vh}
.hero{padding:54px 0 26px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(330px,.98fr);gap:46px;align-items:start}
.eyebrow{margin:0 0 10px;color:var(--accent-dark);font-size:.8rem;font-weight:850;text-transform:uppercase;letter-spacing:.08em}
h1,h2,h3{color:var(--ink);line-height:1.16;letter-spacing:-.025em}
h1{font-size:clamp(2.15rem,5vw,3.75rem);margin:.1em 0 .28em;max-width:14ch}
h2{font-size:clamp(1.55rem,3vw,2.15rem);margin:2.1rem 0 .7rem}
h3{font-size:1.2rem;margin:1.5rem 0 .55rem}
.hero-copy{font-size:1.12rem;color:var(--ink-2);max-width:59ch;margin:0 0 18px}
.hero-list{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:9px;color:var(--muted)}
.hero-list li::before{content:"✓";color:var(--success);font-weight:900;margin-right:9px}
.calc-card{border:1px solid var(--border);border-radius:18px;background:#fff;box-shadow:var(--shadow);padding:26px}
.calc-card h2{font-size:1.35rem;margin:0 0 6px}
.calc-card .subtle{margin:0 0 20px;color:var(--muted);font-size:.94rem}
.ratio-row{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.ratio-term{width:116px;min-width:0}
.ratio-term input,.single-input input,.field-grid input{width:100%;min-height:50px;border:1px solid #bcc8d2;border-radius:10px;padding:10px 12px;background:#fff;color:var(--ink);font-size:1.05rem;outline:none}
.ratio-term input:focus,.single-input input:focus,.field-grid input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(217,111,50,.14)}
.colon{font-size:1.45rem;color:var(--muted);font-weight:800}
.add-term{border:1px dashed #acbac6;background:var(--soft);color:var(--ink);border-radius:10px;min-height:48px;padding:8px 13px;font-weight:750}
.add-term:hover{border-color:var(--accent);background:var(--soft-warm)}
.remove-term{border:0;background:transparent;color:#8a4b34;font-weight:800;padding:5px 2px;font-size:.85rem}
.calc-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:18px}
.btn{display:inline-flex;justify-content:center;align-items:center;min-height:46px;border-radius:10px;border:1px solid transparent;padding:10px 18px;font-weight:800;text-decoration:none}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:#0d273d;color:#fff}
.btn-secondary{background:#fff;border-color:#b8c4cd;color:var(--ink)}
.btn-secondary:hover{border-color:var(--accent);color:var(--accent-dark)}
.example-links{margin:14px 0 0;color:var(--muted);font-size:.88rem}
.example-link{border:0;padding:2px 4px;background:transparent;color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.form-note{font-size:.84rem;color:var(--muted);margin:12px 0 0}
.validation{min-height:1.45em;margin:10px 0 0;color:#a43b24;font-weight:700;font-size:.9rem}
.result-panel{margin-top:20px;border-top:1px solid var(--border);padding-top:20px}
.result-panel[hidden]{display:none}
.result-kicker{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:850;margin:0 0 3px}
.result-main{font-size:clamp(2rem,6vw,3rem);line-height:1.1;color:var(--success);font-weight:900;letter-spacing:-.03em;margin:0 0 14px;overflow-wrap:anywhere}
.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:14px 0}
.result-item{background:var(--soft);border-radius:10px;padding:12px}
.result-item strong{display:block;color:var(--ink);font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;margin-bottom:3px}
.working{margin-top:12px;background:var(--soft-warm);border-left:4px solid var(--accent);padding:14px 15px;border-radius:8px;color:var(--ink-2);overflow-wrap:anywhere}
.section{padding:44px 0}
.section-soft{background:var(--soft)}
.section h2:first-child{margin-top:0}
.reading{max-width:var(--reading);margin:0 auto}
.quick-answer{background:var(--soft-warm);border:1px solid #eaded2;border-left:5px solid var(--accent);border-radius:12px;padding:20px 22px;margin:22px 0 30px}
.quick-answer strong{color:var(--ink)}
.steps{counter-reset:steps;display:grid;gap:14px;margin:22px 0}
.step{position:relative;padding:18px 18px 18px 58px;border:1px solid var(--border);border-radius:12px;background:#fff}
.step::before{counter-increment:steps;content:counter(steps);position:absolute;left:18px;top:17px;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--ink);color:#fff;font-size:.8rem;font-weight:900}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.card{border:1px solid var(--border);border-radius:13px;padding:20px;background:#fff}
.card h3{margin-top:0}
.card p{color:var(--muted);font-size:.95rem}
.card a{font-weight:800}
.example-table{width:100%;border-collapse:collapse;margin:20px 0 8px;border:1px solid var(--border);font-size:.95rem}
.example-table th,.example-table td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--border)}
.example-table th{background:var(--soft);color:var(--ink)}
.example-table tr:last-child td{border-bottom:0}
.faq details{border-top:1px solid var(--border);padding:15px 0}
.faq details:last-child{border-bottom:1px solid var(--border)}
.faq summary{cursor:pointer;color:var(--ink);font-weight:800}
.faq details p{margin:9px 0 0;color:var(--muted)}
.breadcrumbs{padding-top:24px;font-size:.88rem;color:var(--muted)}
.breadcrumbs a{color:var(--muted)}
.page-hero{padding:22px 0 8px}
.page-hero h1{max-width:20ch;font-size:clamp(2rem,4.5vw,3rem)}
.page-hero p{font-size:1.06rem;color:var(--ink-2);max-width:68ch}
.tool-layout{display:grid;grid-template-columns:minmax(0,.95fr) minmax(300px,1.05fr);gap:36px;align-items:start;padding:22px 0 24px}
.field-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.field label,.single-input label{display:block;color:var(--ink);font-size:.9rem;font-weight:800;margin-bottom:6px}
.single-input{max-width:420px}
.inline-unit{display:flex;align-items:stretch;max-width:420px}
.inline-unit input{border-radius:10px 0 0 10px}
.inline-unit span{display:grid;place-items:center;padding:0 14px;background:var(--soft);border:1px solid #bcc8d2;border-left:0;border-radius:0 10px 10px 0;color:var(--ink);font-weight:850}
.notice{padding:14px 16px;background:var(--soft);border:1px solid var(--border);border-radius:10px;color:var(--muted);font-size:.92rem}
.site-footer{margin-top:64px;background:#102b42;color:#dce5ec}
.footer-inner{padding-top:34px;padding-bottom:30px;display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:32px}
.site-footer .brand{color:#fff}
.site-footer .brand-mark{background:#fff;color:var(--ink)}
.site-footer a{color:#e8edf1}
.site-footer h3{color:#fff;margin-top:0;font-size:1rem}
.footer-links{display:grid;gap:8px}
.footer-copy{font-size:.91rem;color:#becbd5;margin-top:12px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:16px 24px 22px;text-align:center;font-size:.84rem;color:#aebfcb}
.mini-label{font-size:.78rem;font-weight:850;text-transform:uppercase;letter-spacing:.07em;color:var(--accent-dark)}
.error-page{text-align:center;padding:80px 24px;max-width:700px;margin:auto}
.error-page h1{max-width:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:860px){
  .hero-grid,.tool-layout{grid-template-columns:1fr}
  .hero{padding-top:38px}
  .card-grid{grid-template-columns:1fr 1fr}
  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-inner>div:first-child{grid-column:1/-1}
}
@media(max-width:640px){
  .header-inner{padding-top:15px;padding-bottom:15px;align-items:flex-start;flex-direction:column;gap:11px}
  .main-nav{gap:12px 16px}
  .main-nav a{font-size:.9rem}
  .header-inner,.footer-inner,.wrap{padding-left:18px;padding-right:18px}
  .calc-card{padding:19px;border-radius:14px}
  .ratio-row{gap:7px}
  .ratio-term{width:92px;flex:1 1 78px;max-width:120px}
  .add-term{flex:1 0 100%;width:100%}
  .result-grid,.card-grid,.field-grid,.footer-inner{grid-template-columns:1fr}
  .footer-inner>div:first-child{grid-column:auto}
  .example-table{font-size:.89rem}
  .example-table th,.example-table td{padding:9px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}