/* Tutor subject pages — Academic Editorial, approved premium website palette.
   Independent of the homepage UI; no external fonts, scripts, or image services. */
:root{
 color-scheme:light;--seo-bg:#f7f4ee;--seo-paper:#fdfbf7;--seo-ink:#20332d;
 --seo-muted:#58665e;--seo-rule:#d7d7cb;--seo-gold:#b49056;--seo-forest:#173d34;
 --seo-ser:Georgia,"Iowan Old Style","Times New Roman",serif;
 --seo-sans:Arial,"Helvetica Neue",Helvetica,sans-serif
}
:root[data-theme=dark]{
 color-scheme:dark;--seo-bg:#121b1d;--seo-paper:#172326;--seo-ink:#f1eee5;
 --seo-muted:#b6c1bc;--seo-rule:#39494a;--seo-gold:#d5b783;--seo-forest:#163b34
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}body{margin:0;background:var(--seo-bg);color:var(--seo-ink);font:16px/1.75 var(--seo-sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}a:focus-visible{outline:3px solid var(--seo-gold);outline-offset:4px}
::selection{background:var(--seo-gold);color:#102a23}
.seo-shell{width:min(1130px,calc(100% - 80px));margin-inline:auto}
.seo-skip{position:fixed;top:0;left:1rem;background:var(--seo-paper);z-index:100;padding:.6rem 1rem;transform:translateY(-150%)}.seo-skip:focus{transform:none}
.seo-header{border-bottom:1px solid var(--seo-rule);background:var(--seo-paper)}
.seo-header-inner{min-height:100px;display:flex;justify-content:space-between;align-items:center;gap:24px}
.seo-brand{display:flex;flex-direction:column;justify-content:center;gap:1px}
.seo-wordmark{font:400 clamp(1.15rem,2.15vw,1.45rem)/1.3 var(--seo-ser);letter-spacing:-.035em}
.seo-brand-sub{font-size:.59rem;letter-spacing:.15em;color:var(--seo-muted);white-space:nowrap}
.seo-header-nav{display:flex;flex-wrap:wrap;gap:16px 25px;font-size:.81rem;font-weight:600;color:var(--seo-muted)}
.seo-header-nav a:hover,.seo-header-nav a:focus-visible{color:var(--seo-ink)}
.seo-hero{background:var(--seo-paper);border-bottom:1px solid var(--seo-rule)}
.seo-hero-inner{padding:32px 0 clamp(70px,9vw,125px)}
.seo-breadcrumb{display:flex;align-items:center;gap:10px;font-size:.75rem;color:var(--seo-muted);margin-bottom:clamp(60px,8vw,96px)}
.seo-breadcrumb a{text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--seo-rule)}
.seo-eyebrow{font-size:.68rem;font-weight:750;letter-spacing:.2em;text-transform:uppercase;color:var(--seo-muted);margin:0 0 17px}
.seo-hero h1{font:400 clamp(2.75rem,6.1vw,5.35rem)/1.065 var(--seo-ser);letter-spacing:-.06em;max-width:980px;margin:0 0 27px;text-wrap:balance}
.seo-hero h1 em{font-style:italic;color:var(--seo-gold);letter-spacing:-.05em}
.seo-lead{font-size:clamp(1.06rem,1.75vw,1.27rem);line-height:1.8;max-width:745px;color:var(--seo-muted);margin:0}
.seo-hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:19px 28px;margin-top:36px}
.seo-hero-actions>span{font-size:.78rem;line-height:1.6;color:var(--seo-muted);max-width:300px}
.seo-button{display:inline-flex;align-items:center;justify-content:center;gap:28px;padding:13px 23px;min-height:52px;border-radius:30px;background:var(--seo-forest);color:#fff;font-weight:650;font-size:.84rem;transition:transform .2s,background .2s}
.seo-button:hover{transform:translateY(-2px)}
.seo-topic-nav{display:flex;flex-wrap:wrap;gap:10px;padding-top:29px;padding-bottom:29px;border-bottom:1px solid var(--seo-rule)}
.seo-topic-nav a{font-size:.78rem;border:1px solid var(--seo-rule);padding:7px 13px;border-radius:28px;line-height:1.65;color:var(--seo-muted)}
.seo-topic-nav a[aria-current=page]{background:var(--seo-ink);color:var(--seo-bg);border-color:var(--seo-ink)}
.seo-topic-nav a:not([aria-current]):hover{border-color:var(--seo-gold);color:var(--seo-ink)}
.seo-intro{padding-top:clamp(70px,9vw,115px);padding-bottom:clamp(70px,10vw,130px);max-width:900px}
.seo-intro h2,.seo-section-head h2,.seo-method h2,.seo-questions h2,.seo-related h2,.seo-cta h2{font:400 clamp(2rem,3.8vw,3.55rem)/1.18 var(--seo-ser);letter-spacing:-.045em;margin:0 0 23px;text-wrap:balance}
.seo-intro p:not(.seo-eyebrow){font-size:clamp(.99rem,1.5vw,1.12rem);line-height:1.9;color:var(--seo-muted);max-width:67ch;margin:0 0 21px}
.seo-expertise{padding-bottom:clamp(80px,10vw,140px)}
.seo-section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;padding-bottom:31px}
.seo-section-head h2{max-width:590px;margin-bottom:0}
.seo-section-head>p{max-width:250px;color:var(--seo-muted);font-size:.87rem;margin:0}
.seo-topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}
.topic-card{border:1px solid var(--seo-rule);background:var(--seo-paper);padding:clamp(26px,4vw,44px) clamp(24px,4vw,40px);min-height:256px;display:flex;flex-direction:column}
.topic-number{font-size:.74rem;color:var(--seo-gold);font-weight:750;letter-spacing:.12em}
.topic-card h3{font:400 clamp(1.34rem,2vw,1.75rem)/1.3 var(--seo-ser);margin:25px 0 13px;letter-spacing:-.02em}
.topic-card p{font-size:.91rem;line-height:1.85;color:var(--seo-muted);margin:0}
.seo-method{background:#173d34;color:#f7f4ee;padding:clamp(78px,10vw,135px) 0}
.seo-method-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,7vw,100px)}
.seo-method .seo-eyebrow{color:#e1c79b}
.seo-method h2{margin-bottom:24px;max-width:480px}
.seo-method-grid>div>p:last-child{color:#d0ded6;max-width:440px;margin:0}
.seo-steps{list-style:none;margin:0;padding:0}
.seo-steps li{padding:3px 0 25px;margin-bottom:22px;border-bottom:1px solid #ffffff3d}
.seo-steps li:last-child{margin:0;border-bottom:0;padding-bottom:0}
.seo-steps h3{font:400 1.46rem/1.35 var(--seo-ser);margin:0 0 10px}
.seo-steps p{font-size:.91rem;color:#d0ded6;line-height:1.85;margin:0}
.seo-questions{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(32px,6vw,100px);padding-top:clamp(80px,10vw,132px);padding-bottom:clamp(70px,9vw,110px)}
.seo-faqs{border-top:1px solid var(--seo-rule)}
.faq-item{padding:24px 0 25px;border-bottom:1px solid var(--seo-rule)}
.faq-item h3{font:400 clamp(1.22rem,2vw,1.5rem)/1.4 var(--seo-ser);margin:0 0 9px}
.faq-item p{font-size:.91rem;line-height:1.83;color:var(--seo-muted);margin:0}
.seo-related{padding-bottom:clamp(70px,9vw,125px)}
.seo-related h2{font-size:clamp(1.6rem,3vw,2.2rem)}
.seo-related-links{display:flex;flex-wrap:wrap;gap:11px}
.related-link{display:inline-flex;align-items:center;gap:24px;border:1px solid var(--seo-rule);border-radius:32px;padding:12px 20px;font-size:.88rem;background:var(--seo-paper)}
.related-link:hover{border-color:var(--seo-gold)}
.seo-cta{background:#173d34;color:#f7f4ee;border-top:1px solid #396155}
.seo-cta-inner{display:flex;align-items:center;justify-content:space-between;gap:35px;padding-top:clamp(55px,7vw,90px);padding-bottom:clamp(60px,8vw,95px)}
.seo-cta h2{max-width:680px}
.seo-cta p:not(.seo-eyebrow){font-size:.94rem;color:#d0ded6;max-width:680px;margin:0}
.seo-cta .seo-eyebrow{color:#e1c79b}
.seo-button-light{background:#fdfbf7;color:#173d34;flex-shrink:0}
.seo-footer{background:var(--seo-paper);padding:54px 0 35px;border-top:1px solid var(--seo-rule);color:var(--seo-muted);font-size:.82rem}
.seo-footer p{max-width:800px;margin:0 0 13px}
.seo-footer-name{font-family:var(--seo-ser);color:var(--seo-ink);font-size:1.15rem}
.seo-footer-name span{font:400 .72rem/1.4 var(--seo-sans);color:var(--seo-muted)}
.seo-footer-links{display:flex;gap:17px;margin:18px 0}
.seo-footer-links a{text-decoration:underline;text-underline-offset:4px}
.seo-footer small{font-size:.75rem;color:var(--seo-muted)}
/* Homepage: unobtrusive, crawlable links; no changes to existing cards or interactive tabs. */
.seo-home-discovery{padding:25px 0 clamp(55px,7vw,90px);border-top:1px solid var(--rule,#d7d7cb)}
.seo-home-discovery .seo-home-title{font:400 clamp(1.7rem,3vw,2.45rem)/1.25 Georgia,"Iowan Old Style","Times New Roman",serif;letter-spacing:-.03em;margin:0 0 12px}
.seo-home-discovery .seo-home-caption{color:var(--muted,#58665e);font-size:.89rem;max-width:680px;margin:0 0 24px}
.seo-home-links{display:flex;flex-wrap:wrap;gap:10px}
.seo-home-links a{display:inline-flex;gap:18px;align-items:center;padding:10px 18px;border:1px solid var(--rule,#d7d7cb);border-radius:28px;font-size:.8rem;background:var(--paper,#fdfbf7)}
.seo-home-links a:hover{border-color:var(--gold,#b49056)}
@media(max-width:800px){
 .seo-shell{width:calc(100% - 42px)}
 .seo-header-inner{flex-wrap:wrap;gap:12px;padding:20px 0}
 .seo-header-nav{gap:11px 20px}
 .seo-section-head{display:block}
 .seo-section-head>p{margin-top:20px}
 .seo-method-grid,.seo-questions{grid-template-columns:1fr}
 .seo-cta-inner{align-items:start;flex-direction:column}
}
@media(max-width:560px){
 .seo-shell{width:calc(100% - 34px)}
 .seo-header-nav{gap:11px 18px;font-size:.77rem}
 .seo-brand-sub{font-size:.53rem}
 .seo-hero-inner{padding-top:25px;padding-bottom:66px}
 .seo-breadcrumb{margin-bottom:56px}
 .seo-hero h1{font-size:clamp(2.5rem,11vw,3.9rem)}
 .seo-hero-actions{align-items:start;flex-direction:column}
 .seo-topic-grid{grid-template-columns:1fr;gap:11px}
 .topic-card{min-height:0;padding:25px}
 .topic-card h3{margin-top:18px}
 .seo-related-links{flex-direction:column;align-items:stretch}
 .related-link{justify-content:space-between}
 .seo-home-discovery{padding-top:36px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.seo-button{transition:none}.seo-button:hover{transform:none}}