*{box-sizing:border-box}
:root{
 --parchment:#F3EAD0;--chocolate:#251B12;--cream:#F3EAD6;--sienna:#A6543E;--brick:#B14A28;
 --vermilion:#E23A18;--pompeii:#B97C54;--muted-ink:#7A6648;--muted-cream:#E4D2AB;
 --hairline:rgba(37,27,18,.14);--maxw:1120px;--measure:66ch;--radius:4px;
}
html{scroll-behavior:smooth}
body{margin:0;background:var(--parchment);color:var(--chocolate);font-family:Spectral,Georgia,serif;font-size:1.0625rem;line-height:1.62;-webkit-font-smoothing:antialiased}
h1,h2,h3,.wordmark,.triad{font-family:Marcellus,'Times New Roman',serif;font-weight:400;line-height:1.1;letter-spacing:.01em}
h1{font-size:clamp(2.2rem,4.4vw,3.5rem);margin:0 0 .5em}
h2{font-size:clamp(1.6rem,2.8vw,2.2rem);margin:0 0 .7em}
h3{font-size:1.18rem;margin:0 0 .3em}
p{margin:0 0 0.5em}
a{color:var(--sienna);text-underline-offset:3px}
strong{font-weight:600}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(1.25rem,4vw,2.5rem)}
.section{padding-block:clamp(2.8rem,7vw,3rem)}
.prose{max-width:var(--measure)}
.eyebrow{font-family:Marcellus,serif;text-transform:uppercase;letter-spacing:.2em;font-size:.78rem;color:var(--sienna);margin:0 0 1rem;display:block}
.lead{font-size:1.2rem;color:var(--muted-ink);max-width:54ch}
.surface-parchment{background:var(--parchment);color:var(--chocolate)}
.surface-chocolate{background:var(--chocolate);color:var(--cream)}
.surface-sienna{background:var(--sienna);color:var(--cream)}
.surface-chocolate .eyebrow{color:var(--muted-cream)}
.surface-sienna .eyebrow{color:var(--cream)}
.surface-chocolate .lead,.surface-sienna .lead{color:var(--muted-cream)}
.surface-chocolate a:not(.btn){color:var(--cream)}
.btn{display:inline-block;font-family:Spectral,serif;font-weight:600;font-size:1rem;padding:.78em 1.4em;border-radius:var(--radius);text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:transform .15s ease,filter .15s ease}
.btn:hover{transform:translateY(-1px);filter:brightness(1.04)}
.btn-brick{background:var(--brick);color:var(--cream)}
.btn-cream{background:var(--cream);color:var(--chocolate)}
.btn-outline{background:transparent;color:var(--cream);border-color:var(--cream)}
.btn-row{display:flex;gap:1rem;flex-wrap:wrap;margin-top:1.7rem}
.plist{list-style:none;padding:0;margin:1.4rem 0;max-width:var(--measure)}
.plist li{padding:.6rem 0 .6rem 1.5rem;border-bottom:1px solid var(--hairline);position:relative;font-size:1.05rem}
.plist li::before{content:"";position:absolute;left:0;top:1.15rem;width:.8rem;height:1px;background:var(--sienna)}
.plist.mono li{font-family:Spectral,serif;letter-spacing:.01em}
.surface-chocolate .plist li{border-color:rgba(243,234,214,.16)}
.surface-chocolate .plist li::before{background:var(--muted-cream)}
.faq{margin-top:2rem;border-top:1px solid var(--hairline);max-width:var(--measure)}
.faq details{border-bottom:1px solid var(--hairline)}
.faq summary{font-family:Marcellus,serif;font-size:1.18rem;padding:1.05rem 2rem 1.05rem 0;cursor:pointer;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:.95rem;font-size:1.4rem;color:var(--sienna)}
.faq details[open] summary::after{content:"\2013"}
.faq details p{padding:0 0 1.2rem;color:var(--muted-ink)}
.faq .notes-panel{margin-top:1rem;border:1px solid var(--hairline);border-radius:var(--radius);padding:1rem 1.1rem;background:rgba(166,84,62,.05)}
.faq .notes-panel summary{font-family:Marcellus,serif;font-size:1rem;padding:0 2rem 0 0;cursor:pointer;list-style:none;position:relative}
.faq .notes-panel summary::-webkit-details-marker{display:none}
.faq .notes-panel summary::after{content:"+";position:absolute;right:0;top:.02rem;font-size:1.2rem;color:var(--sienna)}
.faq .notes-panel[open] summary::after{content:"\2013"}
.faq .notes-panel .note-list{margin:.7rem 0 0;padding-left:1.05rem}
.faq .notes-panel .note-list li{margin-bottom:.7rem;padding:.2rem .35rem .2rem 0}
.faq .notes-panel .note-list li.is-active{background:rgba(177,74,40,.12);border-radius:var(--radius)}
.faq .notes-panel .note-number{display:inline-flex;align-items:center;justify-content:center;min-width:1.35rem;height:1.35rem;border-radius:999px;background:var(--brick);color:var(--cream);text-decoration:none;font-size:.86rem;font-weight:600;margin-right:.45rem}
.emblem{display:block;width:auto}
.hero .emblem{height:78px;margin-bottom:1.3rem}
.hero h1{max-width:20ch}
.empty{margin-top:2rem;border:1px dashed var(--hairline);border-radius:var(--radius);padding:2.4rem;text-align:center;color:var(--muted-ink);max-width:var(--measure)}
.triad{font-size:clamp(1.3rem,2.6vw,1.9rem);color:var(--cream);max-width:24ch}
.site-header{position:sticky;top:0;z-index:60;background:var(--parchment);border-bottom:1px solid var(--hairline)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-block:.65rem}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--chocolate)}
.brand .emblem{height:38px}
.brand .wordmark{font-size:1.22rem;letter-spacing:.04em;line-height:1.05;white-space:nowrap}
.brand small{display:block;font-family:Spectral,serif;font-size:.58rem;letter-spacing:.2em;color:var(--muted-ink);text-transform:uppercase;margin-top:3px;white-space:nowrap}
.nav{display:flex;align-items:center;gap:1.5rem}
.nav a{color:var(--chocolate);text-decoration:none;font-size:.97rem}
.nav a:hover,.nav a[aria-current="page"]{text-decoration:underline;text-decoration-color:var(--sienna);text-underline-offset:5px}
.header-actions{display:flex;align-items:center;gap:.8rem}
.header-actions .btn{padding:.5em 1.05em;font-size:.95rem}
.menu-toggle{display:none;background:none;border:0;font-size:1.6rem;line-height:1;cursor:pointer;color:var(--chocolate)}
.page{display:none}
.page.active{display:block;animation:fade .4s ease}
@keyframes fade{from{opacity:0}to{opacity:1}}
.site-footer .wrap{display:flex;flex-direction:column;gap:1.3rem}
.site-footer .brand,.site-footer .brand .wordmark{color:var(--cream)}
.foot-nav{display:flex;gap:1.4rem;flex-wrap:wrap}
.foot-nav a{color:var(--muted-cream);text-decoration:none;font-size:.95rem}
.foot-nav a:hover{color:var(--cream)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:1rem;top:1rem;background:var(--chocolate);color:var(--cream);padding:.6rem 1rem;z-index:100;border-radius:4px}
:focus-visible{outline:2px solid var(--sienna);outline-offset:2px}
.surface-chocolate :focus-visible,.surface-sienna :focus-visible{outline-color:var(--cream)}
.scrim{position:fixed;inset:0;background:rgba(37,27,18,.45);z-index:50;opacity:0;visibility:hidden;transition:opacity .25s ease}
.scrim.show{opacity:1;visibility:visible}
@media(max-width:760px){
 .nav{position:fixed;inset:0 0 0 auto;width:min(80vw,320px);background:var(--parchment);flex-direction:column;align-items:flex-start;justify-content:flex-start;padding:5rem 1.6rem 2rem;transform:translateX(100%);transition:transform .25s ease;box-shadow:-12px 0 50px rgba(0,0,0,.18);z-index:55}
 .nav.open{transform:translateX(0)}
 .nav a{font-size:1.15rem}
 .menu-toggle{display:block;z-index:60}
}
@media(max-width:460px){.brand .emblem{height:34px}.brand .wordmark{font-size:1.02rem}.brand small{font-size:.48rem;letter-spacing:.12em}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

.cards{display:grid;grid-template-columns:1fr;gap:1px;background:var(--hairline);border:1px solid var(--hairline);border-radius:var(--radius);overflow:hidden;margin-top:2rem}
@media(min-width:600px){.cards{grid-template-columns:1fr 1fr}}
@media(min-width:920px){.cards.three{grid-template-columns:1fr 1fr 1fr}}
.card{background:var(--parchment);padding:1.4rem 1.5rem}
.card h3{margin-bottom:.3rem}
.card p{margin:0;color:var(--muted-ink);font-size:.96rem;line-height:1.5}
.surface-brick{background:var(--brick);color:var(--cream)}
.surface-brick .eyebrow{color:var(--cream)}
.surface-brick .lead{color:var(--muted-cream)}
.surface-brick a:not(.btn){color:var(--cream)}
.surface-brick :focus-visible{outline-color:var(--cream)}
.foot-tagline{font-family:Marcellus,serif;font-size:clamp(1.05rem,1.8vw,1.35rem);color:var(--cream);max-width:36ch;line-height:1.32;margin:0}

/* ---- Lane chips ---- */
.lane-row{display:grid;grid-template-columns:1fr;gap:1rem;margin-top:1.8rem;max-width:var(--measure)}
@media(min-width:600px){.lane-row{grid-template-columns:1fr 1fr}}
.lane-chip{text-align:left;background:var(--cream);border:1.5px solid var(--hairline);border-radius:var(--radius);padding:1.1rem 1.2rem;cursor:pointer;font-family:Spectral,serif;color:var(--chocolate);transition:border-color .15s ease,transform .15s ease}
.lane-chip:hover{transform:translateY(-1px);border-color:var(--sienna)}
.lane-chip.active{border-color:var(--brick);box-shadow:inset 0 0 0 1px var(--brick)}
.lane-chip strong{display:block;font-family:Marcellus,serif;font-size:1.1rem;margin-bottom:.25rem}
.lane-chip span{display:block;color:var(--muted-ink);font-size:.93rem;line-height:1.45}

/* ---- Form ---- */
.form{max-width:var(--measure)}
.field{margin-bottom:1.4rem;border:0;padding:0;min-width:0}
.field>label,.field>legend{display:block;font-family:Marcellus,serif;font-size:1.02rem;margin-bottom:.4rem;padding:0}
.field .req{color:var(--brick)}
.field .opt{font-family:Spectral,serif;font-size:.85rem;color:var(--muted-ink);letter-spacing:0}
.field input,.field select,.field textarea{width:100%;font-family:Spectral,serif;font-size:1rem;color:var(--chocolate);background:var(--cream);border:1.5px solid var(--hairline);border-radius:var(--radius);padding:.7em .85em;line-height:1.5}
.field textarea{resize:vertical;min-height:7.5rem}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--sienna);outline-offset:1px;border-color:var(--sienna)}
.field input[aria-invalid="true"],.field textarea[aria-invalid="true"]{border-color:var(--vermilion)}
.field-row{display:grid;grid-template-columns:1fr;gap:0 1.2rem}
@media(min-width:560px){.field-row{grid-template-columns:1fr 1fr}}
.error-text{color:var(--vermilion);font-size:.9rem;margin:.35rem 0 0}
.error-summary{background:rgba(226,58,24,.08);border:1.5px solid var(--vermilion);color:var(--brick);border-radius:var(--radius);padding:.85rem 1rem;margin-bottom:1.6rem;font-size:.97rem}
.conditional{border:1px solid var(--hairline);border-radius:var(--radius);padding:1.3rem 1.4rem;margin-bottom:1.6rem;background:rgba(166,84,62,.05)}
.conditional legend{font-family:Marcellus,serif;font-size:1.05rem;padding:0 .5rem;margin-left:-.5rem}
.checkbox-grid{display:grid;grid-template-columns:1fr;gap:.55rem}
@media(min-width:560px){.checkbox-grid{grid-template-columns:1fr 1fr}}
.check{display:flex;align-items:flex-start;gap:.55rem;font-family:Spectral,serif;font-size:.98rem;line-height:1.4;cursor:pointer}
.check input{width:auto;flex:none;margin-top:.2rem}
.consent{margin-top:.4rem}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-note{color:var(--muted-ink);font-size:.9rem;margin-top:1rem}
.form-success{border:1.5px solid var(--brick);border-radius:var(--radius);padding:2rem 2.2rem;background:rgba(177,74,40,.06);max-width:var(--measure)}
.form-success h2{margin-bottom:.3rem}
.form-success p{color:var(--muted-ink);margin:0}
.preview-tag{margin-top:1rem!important;font-size:.85rem;color:var(--sienna)}
/* ---- Archimedes inclusion list ---- */
.surface-chocolate ul{
  max-width:var(--measure);
  margin:1.4rem 0 1.6rem;
  padding-left:1.2rem;
}
.surface-chocolate ul li{
  margin-bottom:.55rem;
  line-height:1.5;
}
/* ---- Field Notes post styles ---- */
.post{margin-top:2.2rem}
.post-header{border-bottom:1px solid var(--hairline);padding-bottom:1.2rem;margin-bottom:2rem}
.post-meta{font-size:.95rem;color:var(--muted-ink);margin:0}
.post-meta time{font-weight:600;color:var(--sienna)}
.prose blockquote{margin:1.8rem 0;padding:1.2rem 1.6rem;border-left:3px solid var(--sienna);background:rgba(166,84,62,.06);font-style:italic;color:var(--muted-ink)}
.prose blockquote p{margin:0}
.prose blockquote cite{display:block;margin-top:.6rem;font-style:normal;font-size:.9rem;color:var(--sienna)}
.prose hr{border:0;border-top:1px solid var(--hairline);margin:2.5rem 0}
.prose h3{margin-top:1.8rem}
.prose figure{margin:1.6rem 0;text-align:center}
.prose figure img{display:block;width:100%;max-width:720px;margin-inline:auto;border-radius:var(--radius);border:1px solid var(--hairline)}
.prose figcaption{font-size:.9rem;color:var(--muted-ink);margin-top:.6rem;font-style:italic}
@media(min-width:920px){.prose{max-width:78ch}}
.post{margin-top:2.2rem}
.post-header{border-bottom:1px solid var(--hairline);padding-bottom:1.2rem;margin-bottom:2rem}
.post-meta{font-size:.95rem;color:var(--muted-ink);margin:0}
.post-meta time{font-weight:600;color:var(--sienna)}
.prose blockquote{margin:1.8rem 0;padding:1.2rem 1.6rem;border-left:3px solid var(--sienna);background:rgba(166,84,62,.06);font-style:italic;color:var(--muted-ink)}
.prose blockquote p{margin:0}
.prose blockquote cite{display:block;margin-top:.6rem;font-style:normal;font-size:.9rem;color:var(--sienna)}
.prose hr{border:0;border-top:1px solid var(--hairline);margin:2.5rem 0}
.prose h3{margin-top:1.8rem}
.prose figure{margin:1.6rem 0;text-align:center}
.prose figure img{display:block;width:100%;max-width:720px;margin-inline:auto;border-radius:var(--radius);border:1px solid var(--hairline)}
.prose figcaption{font-size:.9rem;color:var(--muted-ink);margin-top:.6rem;font-style:italic}