/* Modern typography layer — system-first for speed, no external font request. */
:root{
  --display:"Aptos Display","Segoe UI Variable Display","SF Pro Display","Helvetica Neue",Arial,ui-sans-serif,system-ui,-apple-system,sans-serif;
  --text:"Aptos","Segoe UI Variable Text","SF Pro Text","Helvetica Neue",Arial,ui-sans-serif,system-ui,-apple-system,sans-serif;
}
body{font-family:var(--text);font-feature-settings:"kern" 1,"liga" 1,"calt" 1}
.brand{font-family:var(--display);font-weight:760;letter-spacing:-.035em}
.navlinks,.hero-label,.index-kicker,.group-number,.tool-index,.principles-kicker,.principle span,.breadcrumbs,.panel-title,.formula-label,.result .label,.copybtn,.search-hint{font-family:var(--text)}
.hero-copy h1,.index-intro h2,.group-head h3,.principles-copy h2,.calc-title,.result .big,.content h2,.legal-title{font-family:var(--display);font-style:normal}
.hero-copy{grid-column:3/10}
.hero-copy h1{font-size:clamp(58px,6.7vw,94px);font-weight:760;line-height:.93;letter-spacing:-.062em}
.hero-copy h1 em{display:inline-block;white-space:nowrap;font-family:inherit;font-style:normal;font-weight:760;letter-spacing:inherit;color:var(--accent)}
.hero-copy p{font-family:var(--text);font-weight:430;letter-spacing:-.018em}
.search-glyph{font-family:var(--display);font-weight:700}
.search-wrap input{font-family:var(--display);font-weight:570;letter-spacing:-.035em}
.index-intro{grid-template-columns:minmax(0,1fr) minmax(0,1fr);column-gap:62px;row-gap:16px;align-items:start}
.index-kicker{grid-column:1/-1;padding-top:0}
.index-intro h2{grid-column:1;max-width:540px;font-weight:720;line-height:1;letter-spacing:-.052em}
.index-intro p{grid-column:2;max-width:500px;margin:5px 0 0;font-weight:430}
.group-head h3{font-weight:700;letter-spacing:-.04em}
.directory-copy strong{font-family:var(--display);font-weight:680;letter-spacing:-.03em}
.principles-copy h2{font-weight:730;line-height:.97;letter-spacing:-.055em}
.principle strong{font-family:var(--display);font-weight:680}
.calc-title{font-weight:760;line-height:.94;letter-spacing:-.06em}
.calc-sub{font-family:var(--text);font-weight:430;letter-spacing:-.016em}
.field label{font-family:var(--text);font-weight:650}
.field input,.field select,.premium-trigger,.premium-option{font-family:var(--text)}
.result .big{font-weight:760;letter-spacing:-.06em;line-height:.95}
.result .sentence,.detail-row,.formula-steps,.content p,.steps,.example-box{font-family:var(--text)}
.content h2{font-weight:720;letter-spacing:-.043em}
.content h3{font-family:var(--display);font-weight:680}
.legal-title{font-weight:760;line-height:.96;letter-spacing:-.055em}
.legal-intro,.legal-card p,.legal-card li{font-family:var(--text)}

/* Tablet: deliberate intermediate composition, not scaled desktop. */
@media(max-width:1024px){
  .wrap{width:min(var(--wrap),calc(100% - 48px))}
  .nav{height:68px}
  .home-hero{padding:58px 0 40px}
  .home-hero-grid{grid-template-columns:repeat(8,minmax(0,1fr));column-gap:18px}
  .hero-label{grid-column:1/3;margin-bottom:24px}
  .hero-copy{grid-column:1/8}
  .hero-copy h1{font-size:clamp(60px,9vw,84px);max-width:760px}
  .hero-copy p{font-size:17px;max-width:620px;margin-top:24px}
  .hero-aside{display:none}
  .search-wrap{margin-top:42px}
  .calculator-index{padding:58px 0 76px}
  .index-intro{column-gap:42px;margin-bottom:42px}
  .index-intro h2{font-size:clamp(40px,5.8vw,56px)}
  .index-grid{gap:32px}
  .group-head{grid-template-columns:52px 1fr;gap:14px;padding:19px 0 23px}
  .directory-link{grid-template-columns:52px 1fr 22px;gap:14px;padding:18px 0}
  .principles{padding:66px 0 72px}
  .principles-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px}
  .principles-copy,.principles-list{grid-column:auto}
  .principles-copy h2{font-size:clamp(46px,6vw,62px)}
  .calc-shell{padding:36px 0 76px}
  .calc-title{font-size:clamp(50px,7.6vw,72px)}
  .calc-sub{font-size:16px;margin:18px 0 30px}
  .content-stack{margin-top:46px}
}

@media(max-width:820px){
  .index-grid{grid-template-columns:1fr;gap:42px}
  .directory-group{max-width:none}
  .principles-grid{grid-template-columns:1fr;gap:38px}
  .principles-copy{max-width:620px}
  .principles-list{max-width:none}
}

/* Phone: own rhythm, touch sizing and hierarchy. */
@media(max-width:720px){
  .wrap{width:min(var(--wrap),calc(100% - 28px))}
  .site-header{backdrop-filter:blur(10px)}
  .nav{height:60px;gap:16px}
  .brand{font-size:14px;gap:8px}.brand-mark{width:22px;height:22px;font-size:11px}
  .navlinks{gap:15px;font-size:9px;letter-spacing:.045em}
  .home-hero{padding:38px 0 28px}
  .home-hero-grid{display:block}
  .hero-label{margin-bottom:20px;font-size:9px;gap:2px}
  .hero-copy h1{font-size:clamp(46px,13.5vw,64px);line-height:.94;letter-spacing:-.057em;max-width:100%}
  .hero-copy h1 em{white-space:nowrap}
  .hero-copy p{font-size:15px;line-height:1.6;margin-top:19px;max-width:34em}
  .search-wrap{margin-top:30px;height:58px;grid-template-columns:34px minmax(0,1fr)}
  .search-wrap input{height:56px;font-size:18px;padding-right:0;min-width:0}
  .search-glyph{font-size:21px}.search-hint{display:none}
  .calculator-index{padding:44px 0 58px}
  .index-intro{display:block;margin-bottom:30px}
  .index-kicker{font-size:9px;margin-bottom:9px}
  .index-intro h2{font-size:clamp(36px,10vw,46px);line-height:1.02;max-width:11em}
  .index-intro p{font-size:13.5px;line-height:1.65;margin-top:14px;max-width:36em}
  .index-grid{gap:36px}
  .directory-group{border-top-width:2px}
  .group-head{grid-template-columns:38px 1fr;gap:10px;padding:17px 0 20px}
  .group-head h3{font-size:26px}.group-head p{font-size:12.5px;line-height:1.5;margin-top:6px}
  .directory-link{grid-template-columns:38px minmax(0,1fr) 18px;gap:10px;padding:17px 0}
  .directory-link:hover{padding-left:0}
  .tool-index{font-size:9px;padding-top:4px}.directory-copy strong{font-size:16px}.directory-copy span{font-size:12px;line-height:1.45;margin-top:4px}
  .principles{padding:52px 0 58px}
  .principles-grid{display:block}
  .principles-copy{margin-bottom:34px}
  .principles-kicker{font-size:9px;margin-bottom:12px}
  .principles-copy h2{font-size:clamp(42px,12vw,54px);line-height:.98}
  .principles-copy p{font-size:14px;line-height:1.65;margin-top:20px}
  .principle{grid-template-columns:36px 1fr;gap:10px;padding:15px 0 17px}.principle strong{font-size:14px}.principle p{font-size:12px}
  .calc-shell{padding:24px 0 56px}
  .breadcrumbs{margin-bottom:20px;font-size:9px;gap:7px}
  .calc-title{font-size:clamp(42px,12vw,58px);line-height:.98;letter-spacing:-.052em}
  .calc-sub{font-size:14.5px;line-height:1.62;margin:16px 0 24px}
  .content-stack{margin-top:36px}
  .content{padding:23px 0 26px}.content h2{font-size:25px;line-height:1.12}.content p{font-size:13.5px;line-height:1.68}
  .footer{padding:23px 0 30px}.footer-row{align-items:flex-start;flex-direction:column;gap:12px}.footer-links{gap:14px 18px}
}

@media(max-width:430px){
  .wrap{width:min(var(--wrap),calc(100% - 24px))}
  .nav{height:58px}.navlinks{gap:12px}.navlinks a:last-child{display:none}
  .hero-copy h1{font-size:clamp(44px,14.6vw,58px)}
  .hero-copy p{font-size:14.5px}
  .search-wrap{height:56px}.search-wrap input{height:54px;font-size:17px}
  .index-intro h2{font-size:38px}
  .group-head{grid-template-columns:32px 1fr}.directory-link{grid-template-columns:32px minmax(0,1fr) 16px;gap:9px}
  .calc-title{font-size:clamp(40px,13vw,52px)}
}