:root{
  --ink:#1B1D22; --ink2:#3A3E47; --bone:#EDEDE8; --bone2:#E2E1D9; --line:#C9C8BE;
  --gA:#1E5A38; --gB:#8A6A1F; --gC:#5A6472;
  --max:1120px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{background:var(--bone);color:var(--ink);font-family:'Source Serif 4',Georgia,serif;font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
.mono{font-family:'IBM Plex Mono',ui-monospace,monospace}
h1,h2,h3,.disp{font-family:'Archivo',Arial,sans-serif;font-weight:800;line-height:1.05;letter-spacing:-.01em}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:3px solid var(--gA);outline-offset:2px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink2)}
.rule2{border:0;border-top:1px solid var(--ink);height:3px;border-bottom:1px solid var(--ink);margin:0}
/* header */
header{border-bottom:2px solid var(--ink);background:var(--bone);position:sticky;top:0;z-index:50}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-family:'Archivo',sans-serif;font-weight:900;font-size:26px;letter-spacing:.04em;text-decoration:none}
.logo span{color:var(--gA)}
.nav ul{display:flex;gap:26px;list-style:none;align-items:center}
.nav a{text-decoration:none;font-family:'Archivo',sans-serif;font-weight:600;font-size:14px}
.nav a:hover{text-decoration:underline;text-underline-offset:4px}
.cta{background:var(--ink);color:var(--bone)!important;padding:10px 18px;border:2px solid var(--ink)}
.cta:hover{background:var(--bone);color:var(--ink)!important;text-decoration:none!important}
.menu-btn{display:none;background:none;border:2px solid var(--ink);padding:6px 12px;font-family:'Archivo',sans-serif;font-weight:700}
/* hero */
.hero{padding:72px 0 56px;border-bottom:2px solid var(--ink)}
.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:start}
.hero h1{font-size:clamp(40px,6vw,72px);text-transform:uppercase}
.hero h1 em{font-style:normal;color:var(--gA)}
.hero p.lede{font-size:20px;margin-top:20px;max-width:34em;color:var(--ink2)}
.hero-actions{margin-top:28px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;font-family:'Archivo',sans-serif;font-weight:700;font-size:15px;text-decoration:none;padding:13px 22px;border:2px solid var(--ink)}
.btn.solid{background:var(--ink);color:var(--bone)}
.btn.solid:hover{background:var(--bone);color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--bone)}
/* spec card */
.spec{border:2px solid var(--ink);background:#fff}
.spec .spec-head{display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid var(--ink);padding:10px 14px}
.spec .spec-body{padding:16px 14px;display:grid;gap:10px}
.specrow{display:flex;justify-content:space-between;gap:12px;font-size:14px;border-bottom:1px dashed var(--line);padding-bottom:8px}
.specrow:last-child{border-bottom:0;padding-bottom:0}
.specrow .k{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink2)}
/* grade chips */
.grade{display:inline-flex;align-items:center;gap:8px;font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.1em;border:2px solid currentColor;padding:4px 10px;text-transform:uppercase;background:#fff}
.grade b{font-size:16px}
.grade.A{color:var(--gA)} .grade.B{color:var(--gB)} .grade.C,.grade.T{color:var(--gC)}
/* sections */
section{padding:64px 0}
section.alt{background:var(--bone2);border-top:2px solid var(--ink);border-bottom:2px solid var(--ink)}
h2.sec{font-size:clamp(28px,4vw,42px);text-transform:uppercase;margin-bottom:10px}
.sub{color:var(--ink2);max-width:44em;margin-bottom:36px}
/* treatment cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{border:2px solid var(--ink);background:#fff;display:flex;flex-direction:column;text-decoration:none;transition:transform .12s ease,box-shadow .12s ease}
.card:hover{transform:translate(-3px,-3px);box-shadow:6px 6px 0 var(--ink)}
.card .top{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:2px solid var(--ink)}
.card .chan{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink2)}
.card h3{padding:16px 16px 6px;font-size:21px}
.card p{padding:0 16px 18px;font-size:15px;color:var(--ink2);flex:1}
.card .go{padding:10px 16px;border-top:1px solid var(--line);font-family:'Archivo',sans-serif;font-weight:700;font-size:13px}
/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:2px solid var(--ink);background:#fff}
.step{padding:24px 20px;border-right:2px solid var(--ink)}
.step:last-child{border-right:0}
.step .n{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--ink2)}
.step h3{font-size:18px;margin:8px 0 8px}
.step p{font-size:14.5px;color:var(--ink2)}
/* evidence legend */
.legend{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.leg{border:2px solid var(--ink);background:#fff;padding:22px}
.leg p{font-size:15px;color:var(--ink2);margin-top:10px}
/* prose pages */
.prose{max-width:46em;padding:56px 0}
.prose h1{font-size:clamp(32px,5vw,52px);text-transform:uppercase;margin-bottom:18px}
.prose h2{font-size:24px;margin:34px 0 10px}
.prose p{margin:14px 0}
.prose ul{margin:14px 0 14px 22px}
.prose li{margin:6px 0}
/* faq */
details{border:2px solid var(--ink);background:#fff;margin-bottom:12px}
summary{cursor:pointer;padding:16px 18px;font-family:'Archivo',sans-serif;font-weight:700;list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;font-size:20px}
details[open] summary::after{content:"\2212"}
details .a{padding:0 18px 16px;color:var(--ink2)}
/* banner */
.note{border:2px solid var(--ink);background:#fff;padding:14px 18px;font-size:14.5px;color:var(--ink2)}
/* footer */
footer{background:var(--ink);color:var(--bone);padding:56px 0 40px;margin-top:0}
footer a{color:var(--bone)}
.fgrid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
.fgrid h4{font-family:'Archivo',sans-serif;font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:12px;color:#B8B7AD}
.fgrid ul{list-style:none}
.fgrid li{margin:7px 0;font-size:14.5px}
.legal{margin-top:36px;padding-top:20px;border-top:1px solid #3A3E47;font-size:12.5px;color:#B8B7AD;line-height:1.6}
@media(max-width:900px){
  .hero-grid,.cards,.steps,.legend{grid-template-columns:1fr}
  .steps .step{border-right:0;border-bottom:2px solid var(--ink)}
  .steps .step:last-child{border-bottom:0}
  .fgrid{grid-template-columns:1fr 1fr}
  .nav ul{display:none}
  .nav ul.open{display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;background:var(--bone);border-bottom:2px solid var(--ink);padding:18px 24px;align-items:flex-start}
  .menu-btn{display:block}
}