:root{
  --paper:#f3f1eb;
  --paper-2:#ece9e1;
  --surface:#fffefb;
  --ink:#151515;
  --muted:#6d6b66;
  --muted-2:#96928a;
  --line:#d7d3ca;
  --line-dark:#bdb8ae;
  --accent:#2447ff;
  --accent-soft:#e9edff;
  --dark:#161616;
  --dark-2:#202020;
  --success:#16734c;
  --wrap:1180px;
  --sans:"Helvetica Neue",Helvetica,Arial,ui-sans-serif,system-ui,-apple-system,sans-serif;
  --serif:Georgia,"Times New Roman",serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  color-scheme:light;
  font-family:var(--sans);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.5;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit}
button{cursor:pointer}
img,svg{display:block;max-width:100%}
::selection{background:#cfd7ff;color:#101010}
.wrap{width:min(var(--wrap),calc(100% - 44px));margin-inline:auto}

/* Header */
.site-header{position:sticky;top:0;z-index:40;background:rgba(243,241,235,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:30px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:16px;font-weight:760;letter-spacing:-.035em;white-space:nowrap}
.brand-mark{width:24px;height:24px;display:grid;place-items:center;background:var(--ink);color:#fff;font-family:var(--mono);font-size:12px;font-weight:700}
.brand span:not(.brand-mark){color:inherit}
.navlinks{display:flex;align-items:center;gap:28px;font-size:12px;font-weight:650;letter-spacing:.055em;text-transform:uppercase;color:#585651}
.navlinks a{position:relative;padding:3px 0}
.navlinks a::after{content:"";position:absolute;left:0;right:100%;bottom:-3px;height:1px;background:var(--ink);transition:right .18s ease}
.navlinks a:hover::after{right:0}

/* Homepage */
.home-hero{padding:76px 0 48px;border-bottom:1px solid var(--line)}
.home-hero-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:22px;align-items:start}
.hero-label{grid-column:1/3;display:flex;flex-direction:column;gap:4px;font-family:var(--mono);font-size:10px;line-height:1.45;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.hero-copy{grid-column:3/9}
.hero-copy h1{margin:0;font-family:var(--serif);font-size:clamp(58px,7.2vw,100px);font-weight:400;line-height:.88;letter-spacing:-.065em;max-width:850px}
.hero-copy h1 em{font-style:italic;font-weight:400;color:var(--accent)}
.hero-copy p{max-width:660px;margin:28px 0 0;font-size:18px;line-height:1.65;letter-spacing:-.015em;color:#4f4d48}
.hero-aside{grid-column:10/13;padding-top:8px;color:#55534e;font-size:13px;line-height:1.62}
.hero-aside::before{content:"";display:block;width:42px;height:3px;background:var(--accent);margin-bottom:18px}
.hero-aside strong{display:block;color:var(--ink);font-size:13px;margin-bottom:6px}
.hero-aside p{margin:0 0 14px}
.hero-aside ul{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.hero-aside li{display:flex;justify-content:space-between;gap:16px;padding:8px 0;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:10px;letter-spacing:.035em;text-transform:uppercase}
.search-wrap{margin-top:54px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);height:76px;display:grid;grid-template-columns:54px 1fr auto;align-items:center;gap:0}
.search-glyph{font-family:var(--serif);font-size:28px;color:var(--accent);line-height:1}
.search-wrap input{width:100%;height:74px;border:0;outline:0;background:transparent;color:var(--ink);font-family:var(--serif);font-size:26px;letter-spacing:-.025em;padding:0 14px 0 0}
.search-wrap input::placeholder{color:#8b8880}
.search-hint{font-family:var(--mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}

.calculator-index{padding:72px 0 92px}
.index-intro{display:grid;grid-template-columns:2fr 5fr 5fr;gap:22px;margin-bottom:52px;align-items:start}
.index-kicker{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);padding-top:9px}
.index-intro h2{font-family:var(--serif);font-size:clamp(36px,4.7vw,62px);font-weight:400;line-height:.98;letter-spacing:-.045em;margin:0}
.index-intro p{margin:5px 0 0;max-width:440px;color:var(--muted);font-size:14px;line-height:1.7}
.index-grid{display:grid;grid-template-columns:1fr 1fr;gap:62px}
.directory-group{border-top:3px solid var(--ink)}
.group-head{display:grid;grid-template-columns:70px 1fr;gap:18px;padding:22px 0 28px;border-bottom:1px solid var(--line-dark)}
.group-number{font-family:var(--mono);font-size:11px;color:var(--accent);padding-top:4px}
.group-head h3{margin:0;font-family:var(--serif);font-size:31px;font-weight:400;letter-spacing:-.035em;line-height:1.05}
.group-head p{margin:7px 0 0;color:var(--muted);font-size:13px;line-height:1.55;max-width:390px}
.tool-list{display:block}
.directory-link{display:grid;grid-template-columns:70px 1fr 24px;gap:18px;align-items:start;padding:20px 0 19px;border-bottom:1px solid var(--line);transition:padding-left .16s ease,border-color .16s ease}
.directory-link:hover{padding-left:7px;border-bottom-color:var(--ink)}
.tool-index{font-family:var(--mono);font-size:10px;color:var(--muted-2);padding-top:5px}
.directory-copy strong{display:block;font-size:17px;line-height:1.25;letter-spacing:-.025em;font-weight:690}
.directory-copy span{display:block;margin-top:5px;color:var(--muted);font-size:12.5px;line-height:1.5;max-width:380px}
.directory-link .tool-arrow{font-size:18px;line-height:1;color:var(--muted-2);transition:transform .16s ease,color .16s ease}
.directory-link:hover .tool-arrow{transform:translate(2px,-2px);color:var(--accent)}
.no-results{display:none;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);padding:24px 0;margin-top:30px;color:var(--muted);font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.04em}
.no-results.show{display:block}

.principles{background:var(--dark);color:#fff;padding:82px 0 88px}
.principles-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:22px}
.principles-copy{grid-column:1/7}
.principles-kicker{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:#9ba7ff;margin-bottom:18px}
.principles-copy h2{font-family:var(--serif);font-weight:400;font-size:clamp(48px,5.3vw,74px);line-height:.93;letter-spacing:-.05em;margin:0;max-width:640px}
.principles-copy p{max-width:510px;margin:26px 0 0;color:#b9b9b5;font-size:15px;line-height:1.7}
.principles-list{grid-column:8/13;border-top:1px solid #4a4a47}
.principle{display:grid;grid-template-columns:48px 1fr;padding:18px 0 20px;border-bottom:1px solid #3b3b39;gap:12px}
.principle span{font-family:var(--mono);font-size:10px;color:#777771;padding-top:3px}
.principle strong{font-size:14px;font-weight:690;display:block;margin-bottom:4px}
.principle p{margin:0;color:#a7a7a2;font-size:12.5px;line-height:1.55}

/* Calculator pages */
.calc-shell{padding:42px 0 92px}
.breadcrumbs{display:flex;align-items:center;gap:8px;margin-bottom:28px;color:var(--muted);font-family:var(--mono);font-size:10px;letter-spacing:.055em;text-transform:uppercase;white-space:nowrap;overflow:auto}
.breadcrumbs a:hover{color:var(--accent)}
.calc-title{font-family:var(--serif);font-weight:400;font-size:clamp(52px,6.6vw,84px);line-height:.91;letter-spacing:-.058em;margin:0;max-width:920px}
.calc-sub{max-width:760px;margin:22px 0 38px;color:#56534e;font-size:17px;line-height:1.68;letter-spacing:-.012em}
.calc-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(340px,5fr);gap:22px;align-items:start;border-top:1px solid var(--ink);padding-top:22px}
.panel{background:var(--surface);border:1px solid var(--line);padding:30px;box-shadow:none}
.panel-title{margin:0 0 23px;font-family:var(--mono);font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.fields{display:grid;gap:20px}
.inline{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.field{position:relative}
.field label{display:block;margin-bottom:8px;color:#373530;font-size:12px;font-weight:670;letter-spacing:-.008em}
.field input,.field select{width:100%;height:56px;border:1px solid #cbc7bd;background:#faf9f5;color:var(--ink);border-radius:8px;padding:0 15px;outline:none;box-shadow:none;transition:border-color .14s ease,background .14s ease,box-shadow .14s ease}
.field input:hover,.field select:hover{border-color:#a8a398;background:#fff}
.field input:focus,.field select:focus{border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(36,71,255,.10)}
.field input[type="checkbox"]{width:18px;height:18px;vertical-align:-4px;margin:0 8px 0 0}
.note{margin-top:7px;color:var(--muted-2);font-size:11.5px}
.checkbox-row{display:flex;align-items:flex-start;font-size:12.5px;color:var(--muted);line-height:1.45}
.checkbox-row label{font-weight:520;color:#4b4944;cursor:pointer}
.input-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.chip-button,.swap-button{border:1px solid var(--line-dark);background:transparent;color:#4c4944;border-radius:999px;padding:8px 11px;font-family:var(--mono);font-size:10px;font-weight:650;letter-spacing:.02em}
.chip-button:hover,.swap-button:hover{border-color:var(--ink);color:var(--ink);background:#fff}
.formula-box{margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}
.formula-label{font-family:var(--mono);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--muted-2);margin-bottom:9px}
.formula{font-family:var(--mono);font-size:12.5px;line-height:1.62;background:var(--paper);border:1px solid var(--line);border-radius:0;padding:13px 14px;overflow:auto;color:#33312d}
.formula-steps{font-size:12.5px;color:var(--muted);margin:10px 0 0;line-height:1.6}
.result{position:sticky;top:94px;background:var(--dark);color:#fff;padding:30px;min-height:305px;border-radius:0;box-shadow:none}
.result::before{content:"";display:block;width:42px;height:3px;background:var(--accent);margin-bottom:22px}
.result .label{color:#999994;font-family:var(--mono);font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.result .big{font-family:var(--serif);font-size:clamp(48px,6vw,76px);font-weight:400;letter-spacing:-.055em;line-height:.98;margin:12px 0 11px;overflow-wrap:anywhere}
.result .sentence{color:#c7c7c2;font-size:13px;line-height:1.62;min-height:22px}
.details{margin-top:22px;padding-top:13px;border-top:1px solid #393936;display:grid}
.detail-row{display:flex;justify-content:space-between;gap:20px;padding:10px 0;color:#92928d;font-size:11.5px;border-bottom:1px solid #2e2e2c}
.detail-row strong{color:#fff;font-weight:620;text-align:right}
.copybtn{margin-top:20px;width:100%;height:45px;border:1px solid #585854;background:transparent;color:#fff;border-radius:0;font-family:var(--mono);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.copybtn:hover{background:#fff;color:var(--ink);border-color:#fff}
.content-stack{display:grid;gap:0;margin-top:58px;border-top:1px solid var(--ink)}
.content{background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:28px 0 32px;box-shadow:none;max-width:900px}
.content h2{font-family:var(--serif);font-size:31px;font-weight:400;line-height:1.15;letter-spacing:-.035em;margin:0 0 13px}
.content h3{font-size:14px;letter-spacing:-.015em;margin:25px 0 9px}
.content p{color:#56534e;margin:0 0 13px;max-width:760px;font-size:14px;line-height:1.72}
.content p:last-child{margin-bottom:0}
.steps{margin:14px 0 0;padding-left:20px;color:#56534e;font-size:14px}
.steps li{padding:4px 0}
.example-box{margin-top:16px;border-left:3px solid var(--accent);background:#e9e7df;padding:15px 17px;font-size:13px;color:#484640}
.example-box strong{display:block;margin-bottom:5px;color:var(--ink)}
.related{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:15px;border-top:1px solid var(--line-dark)}
.related a{display:flex;justify-content:space-between;gap:14px;align-items:center;border:0;border-bottom:1px solid var(--line);padding:13px 3px 13px 0;font-size:12px;font-weight:660;background:transparent}
.related a::after{content:"↗";color:var(--muted-2)}
.related a:hover{color:var(--accent)}
details.faq{border-top:1px solid var(--line);padding:15px 0}
details.faq:first-of-type{margin-top:7px}
details.faq summary{cursor:pointer;font-weight:660;font-size:13px;list-style:none}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";float:right;color:var(--muted-2);font-weight:400}
details.faq[open] summary::after{content:"–"}
details.faq p{font-size:13px;margin-top:10px;padding-right:28px}

/* Legacy homepage helpers retained for compatibility */
.hero,.section{padding:0}.hero-grid,.grid,.section-head,.trust-strip,.tool-card,.tool-top,.tool-icon,.quick-link,.popular-row,.searchbox{box-sizing:border-box}

/* Footer */
.footer{border-top:1px solid var(--line);padding:27px 0 38px;color:var(--muted);font-family:var(--mono);font-size:10px;letter-spacing:.035em;text-transform:uppercase}
.footer-row{display:flex;align-items:center;justify-content:space-between;gap:24px}
.footer-links{display:flex;gap:20px;flex-wrap:wrap}
.footer a:hover{color:var(--accent)}

@media(max-width:960px){
  .home-hero-grid{grid-template-columns:repeat(8,minmax(0,1fr))}.hero-label{grid-column:1/3}.hero-copy{grid-column:3/9}.hero-aside{display:none}
  .index-intro{grid-template-columns:1fr 3fr}.index-kicker{grid-column:1}.index-intro h2{grid-column:2}.index-intro p{grid-column:2}
  .index-grid{gap:34px}.calc-grid{grid-template-columns:1fr}.result{position:static;min-height:auto}.principles-copy{grid-column:1/7}.principles-list{grid-column:7/13}
}
@media(max-width:720px){
  .wrap{width:min(var(--wrap),calc(100% - 28px))}.nav{height:62px}.navlinks{gap:17px;font-size:9px}.home-hero{padding:48px 0 34px}
  .home-hero-grid{display:block}.hero-label{margin-bottom:26px}.hero-copy h1{font-size:clamp(54px,16vw,75px)}.hero-copy p{font-size:16px;margin-top:22px}
  .search-wrap{margin-top:38px;height:64px;grid-template-columns:36px 1fr}.search-wrap input{height:62px;font-size:21px}.search-hint{display:none}.search-glyph{font-size:24px}
  .calculator-index{padding:52px 0 68px}.index-intro{display:block;margin-bottom:36px}.index-kicker{margin-bottom:10px}.index-intro h2{font-size:42px}.index-intro p{margin-top:16px}
  .index-grid{grid-template-columns:1fr;gap:48px}.group-head{grid-template-columns:48px 1fr}.directory-link{grid-template-columns:48px 1fr 20px}.directory-copy strong{font-size:16px}
  .principles{padding:62px 0}.principles-grid{display:block}.principles-copy{margin-bottom:42px}.principles-copy h2{font-size:48px}.principles-list{margin-top:0}
  .calc-shell{padding:30px 0 64px}.calc-title{font-size:clamp(46px,14vw,64px)}.calc-sub{font-size:15px;margin-bottom:28px}.calc-grid{padding-top:16px}.panel,.result{padding:21px}.inline{grid-template-columns:1fr}.result .big{font-size:50px}.content-stack{margin-top:42px}.content h2{font-size:27px}.related{grid-template-columns:1fr}
  .footer-row{align-items:flex-start;flex-direction:column;gap:13px}
}
@media(max-width:460px){.navlinks a:first-child{display:none}.brand{font-size:14px}.group-head{grid-template-columns:40px 1fr}.directory-link{grid-template-columns:40px 1fr 18px;gap:12px}.tool-index{font-size:9px}}