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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* A short, explicit path from first visit to an actual study design. */
.hero h1{font-size:clamp(42px,4.9vw,62px);max-width:540px}.hero .for-you{font-size:14px;color:var(--ink);max-width:445px;margin:0}.hero .actions{align-items:center;gap:16px}.hero-foot{max-width:475px}.nav-wrap{gap:28px}.nav-wrap nav{gap:21px}.starter-intro{max-width:800px}.starter-intro h1{max-width:780px}.starter-intro .caption{max-width:690px;margin:18px 0 0}.starter-body{max-width:850px}.starter-step{border-top:1px solid var(--line);padding:36px 0}.starter-step h2{font-size:36px}.starter-step>p{max-width:770px}.example-observations{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:25px 0}.example-observations>div{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:22px}.example-observations span,.example-observations small{display:block;color:var(--muted);font-size:13px}.example-observations strong{display:block;font:530 36px var(--serif);margin:12px 0}.why-rule{font-size:15px}.decision-question{border:1px solid #c4d1bf;background:#e5ecdf;border-radius:8px;margin:25px 0 16px;padding:20px 24px 6px;min-width:0}.decision-question legend{font-weight:650;font-size:15px;padding:0 8px}.choice-buttons{display:flex;gap:12px}.choice-buttons button{min-width:100px;justify-content:center;cursor:pointer;background:var(--card)}#decision-feedback{font-size:14px;line-height:1.65;margin:18px 0;min-height:48px}.answer-key summary{cursor:pointer;font-size:14px;font-weight:600}.answer-key p{margin:14px 0 0;font-size:14px}.starter-step .evidence-stages{margin:30px 0}.starter-step .evidence-stages h3{margin:16px 0}.starter-step .evidence-stages p{font-size:14px}.starter-body .next-question{margin-top:0}.next-alternative{font-size:14px;margin:20px 0 0}.guide-start{font-size:15px}
@media(max-width:960px){.nav-wrap{gap:18px}.nav-wrap nav{gap:15px}.nav-wrap nav a{font-size:13px}.hub-wordmark{font-size:24px}.hub-wordmark img{width:58px}.workspace-link{padding:8px 12px;font-size:12px}.hero .actions{gap:14px}.hero .text-link{font-size:13px}}
@media(max-width:700px){.hero h1{font-size:45px;max-width:450px;margin-bottom:20px}.hero .lede{margin-bottom:15px}.hero .for-you{font-size:13px}.hero .actions{margin:20px 0 17px;gap:14px}.hero .hero-foot{font-size:12px;line-height:1.6}.nav-wrap nav{gap:12px}.nav-wrap nav a{font-size:12px;min-height:44px}.starter-step{padding:28px 0}.starter-step h2{font-size:30px}.starter-intro .tags{gap:6px;margin-top:20px}.starter-intro .caption{font-size:12px}.example-observations{gap:10px}.example-observations>div{padding:16px}.example-observations span,.example-observations small{font-size:12px}.example-observations strong{font-size:29px}.decision-question{padding:16px 16px 4px}.decision-question legend{font-size:14px}.starter-step .evidence-stages{grid-template-columns:1fr;gap:8px}.starter-step .evidence-stages article{border-bottom:1px solid var(--line)}.starter-step .evidence-stages h3{margin:10px 0}.starter-step .takeaway{padding:20px}.starter-body .next-question{padding:24px 20px}.starter-body .next-question .button{gap:15px;font-size:13px}.guide-start{font-size:14px}}
@media(max-width:365px){.hero h1{font-size:39px}.hub-wordmark{font-size:20px}.hub-wordmark img{width:47px}.nav-wrap nav{gap:8px}.nav-wrap nav a{font-size:11px}.hero .actions{display:flex;align-items:flex-start;flex-direction:column}.hero .button{font-size:13px;width:100%}.example-observations{grid-template-columns:1fr}.starter-body .next-question .button{gap:10px;font-size:12px}}
@media(max-width:700px){.nav-wrap{gap:0}}

/* Keep the comparison readable on a phone without widening the page. */
.model-comparison{max-width:100%;overflow-x:auto;margin:1.5rem 0;border:1px solid var(--line,#d9d9cc);border-radius:12px}.model-comparison table{width:100%;min-width:640px;border-collapse:collapse;font-size:.9rem;line-height:1.6}.model-comparison caption{text-align:left;padding:1rem;font-weight:600;background:#e8eee5}.model-comparison th,.model-comparison td{padding:1rem;text-align:left;vertical-align:top;border-bottom:1px solid #deded3}.model-comparison thead{background:#edf1f2}.model-comparison th[scope=row]{min-width:125px;color:#236347}.model-comparison:focus-visible{outline:3px solid #356e84;outline-offset:3px}

.hero-foot a{display:table;margin-top:.35rem}

/* Reader navigation and a shorter first screen; existing brand assets retained. */
.principles h2 a{color:var(--ink);text-decoration:none}.principles h2 a:hover{text-decoration:underline}
.study-card dd{text-align:right;max-width:58%}.study-card .text-link{margin-top:auto}
.hero h1{max-width:570px}.research-model-section+section{margin-top:8px}
@media(max-width:960px) and (min-width:701px){.study-card dd{text-align:left;max-width:none}}
@media(max-width:365px){.study-card dd{text-align:left;max-width:none}}

.research-model-section {
  max-width: 1118px;
  margin-inline: auto;
}

.research-model-intro,
.research-model-text,
.research-model-caption {
  max-width: 68ch;
}

.research-model-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
  margin-block: 1.25rem;
}

.research-model-grid-studies {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.research-model-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 1rem;
}

.research-model-card-title {
  font-family: var(--serif);
  color: var(--ink);
  margin: 0 0 0.25rem;
}

.research-model-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.research-model-dl,
.research-model-shared {
  margin: 0;
}

.research-model-dl dt,
.research-model-shared dt {
  font-family: var(--sans);
  font-weight: 600;
  color: var(--ink);
  margin-top: 0.75rem;
}

.research-model-dl dd,
.research-model-shared dd {
  margin: 0.15rem 0 0;
  color: var(--ink);
}

.research-model-output {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

.research-model-details {
  margin-block: 1rem;
}

.research-model-details summary {
  cursor: pointer;
  font-family: var(--sans);
  font-weight: 600;
  color: var(--ink);
}

.research-model-details p {
  margin: 0.5rem 0 0;
}

@media (max-width: 700px) {
  .research-model-grid-studies {
    grid-template-columns: minmax(0, 1fr);
  }
}

.research-model-grid-roles,.research-model-count-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.research-model-count-1{grid-template-columns:minmax(0,1fr)}
.research-model-card{padding:24px}
.research-model-card-title{font-size:26px;margin-bottom:12px}
.research-model-dl,.research-model-shared,.research-model-output{font-size:14px;line-height:1.65}
.research-model-shared{display:grid;grid-template-columns:100px minmax(0,1fr);gap:8px 20px;max-width:850px}
.research-model-shared dt,.research-model-shared dd{margin:0}
.research-model-dl dt{color:var(--green);font-size:12px}
.research-model-output{border-top:1px solid var(--line);padding-top:14px}
.research-model-subheading{font-size:24px;margin:28px 0 12px}
.research-model-details{border:1px solid var(--line);border-radius:8px;padding:20px;max-width:850px;background:var(--card)}
.research-model-details p{font-size:15px;margin-top:14px}
.research-model-caption{margin-top:20px}
@media(max-width:700px){.research-model-grid-roles,.research-model-count-3{grid-template-columns:minmax(0,1fr)}.research-model-shared{grid-template-columns:1fr;gap:4px}.research-model-shared dd+dt{margin-top:12px}.research-model-card{padding:22px}}

.nav-wrap{justify-content:space-between}.nav-wrap nav{margin-left:auto;align-items:center;gap:clamp(13px,2.4vw,32px)}
.nav-wrap nav a{display:inline-flex;flex-direction:column;align-items:center;line-height:1.2;min-height:46px;justify-content:center}
.portal-soon{font-size:9px;letter-spacing:.04em;color:var(--wood);margin-top:3px;font-weight:650;white-space:nowrap}
.portal-home{padding-top:42px}.portal-hero{padding:35px 0 57px;max-width:1040px}.portal-hero h1{max-width:850px}.portal-hero .lede{max-width:720px;font-size:clamp(18px,2.4vw,24px);color:var(--ink)}
.portal-doors{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:42px}.portal-doors a,.portal-track-grid>a,.portal-track-grid>article{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:9px;padding:24px;text-decoration:none;color:var(--ink);min-width:0}
.portal-doors a:hover,.portal-track-grid>a:hover{border-color:#83ab8c;background:#eff3e9}.portal-doors strong{font:540 33px var(--serif);letter-spacing:-.03em}.portal-doors span{font-size:14px;color:var(--muted);margin-top:10px}
.portal-proof{display:grid;grid-template-columns:1.25fr .75fr;gap:36px;padding:44px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.portal-proof h2{max-width:630px}.portal-proof>div>p{max-width:660px}.portal-proof-note{background:#e7edeb;border-radius:9px;padding:28px}.portal-proof-note strong{font:540 27px var(--serif)}.portal-proof-note p{margin:18px 0;font-size:15px}.portal-proof-note a{font-size:14px;font-weight:650}
.portal-next{padding:38px 0 10px;max-width:850px}.portal-next h2{font-size:clamp(30px,3.8vw,44px)}.portal-next p{color:var(--muted)}
.portal-track-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px;padding-bottom:30px}.portal-track-grid h2{font-size:29px;margin:0 0 14px}.portal-track-grid p{font-size:15px;color:var(--muted);margin:0 0 22px}.portal-track-grid small{margin-top:auto;color:var(--green);font-weight:650}.portal-watch-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.portal-watch-grid h2{font-size:27px}.portal-detail{max-width:810px;padding:20px 0}.portal-detail h2{margin-top:29px}.portal-detail p{color:var(--muted)}
@media(max-width:700px){.nav-wrap{padding:11px 18px 0}.nav-wrap nav{width:100%;order:2;justify-content:space-between;gap:2px;margin:5px 0 0}.nav-wrap nav a{font-size:12px;min-height:52px;padding:6px 2px}.portal-soon{font-size:8px}.portal-home{padding-top:12px}.portal-hero{padding:28px 0 40px}.portal-hero h1{font-size:clamp(42px,11vw,58px)}.portal-hero .lede{font-size:18px}.portal-doors{grid-template-columns:1fr;margin-top:28px;gap:9px}.portal-doors a{padding:18px}.portal-doors strong{font-size:28px}.portal-doors span{margin-top:3px}.portal-proof{grid-template-columns:1fr;gap:20px;padding:35px 0}.portal-proof-note{padding:23px}.portal-track-grid,.portal-watch-grid{grid-template-columns:1fr}.portal-track-grid>a,.portal-track-grid>article{padding:22px}}
@media(max-width:365px){.nav-wrap nav a{font-size:11px}.portal-soon{font-size:7px}.hub-wordmark img{width:47px}.hub-wordmark{font-size:20px}}
.lesson-intro{max-width:850px}.lesson-intro h1{max-width:820px}.lesson-body{max-width:920px;margin:0 auto 35px}.lesson-body>section{padding:28px 0;border-top:1px solid var(--line)}.lesson-body h2{font-size:clamp(27px,3.3vw,40px);margin:0 0 15px}.lesson-body h3{font-size:23px;margin:0 0 8px}.lesson-body p{max-width:780px;line-height:1.7}.lesson-body p+p{margin-top:15px}.lesson-cite{display:inline;color:var(--green);font-size:.76em;font-weight:650;white-space:nowrap;text-decoration:none}.lesson-cite:hover{text-decoration:underline}.lesson-term{text-decoration:underline;text-decoration-style:dotted;text-underline-offset:3px}.lesson-methods{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:25px 0}.lesson-methods>section,.lesson-card-grid>a,.lesson-glossary>section{background:var(--card);border:1px solid var(--line);border-radius:9px;padding:23px;min-width:0}.lesson-methods p{font-size:15px;margin-bottom:0}.lesson-methods>section:last-child{grid-column:span 2}.lesson-example{background:#e7edeb;border-left:4px solid var(--green);padding:21px 24px;border-radius:5px;margin:25px 0}.lesson-example strong{color:var(--green)}.lesson-example p{margin-bottom:0}.lesson-table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px;margin:20px 0}.lesson-table{border-collapse:collapse;width:100%;min-width:630px;font-size:14px}.lesson-table caption{text-align:left;padding:12px 16px;color:var(--muted)}.lesson-table th,.lesson-table td{text-align:left;vertical-align:top;padding:13px 16px;border-top:1px solid var(--line)}.lesson-table thead th{background:#e7edeb}.lesson-table tbody th{font-weight:700}.lesson-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.lesson-card-grid>a{text-decoration:none;color:var(--ink);display:flex;flex-direction:column}.lesson-card-grid>a:hover{background:#eff3e9;border-color:#83ab8c}.lesson-card-grid>a span:last-child{margin-top:auto;font-weight:650;color:var(--green)}.lesson-card-grid h2{font-size:28px}.lesson-card-grid p{font-size:15px}.chart-flow{display:grid;gap:12px;margin:24px 0}.chart-flow>div{display:grid;grid-template-columns:190px 1fr;gap:20px;align-items:center;padding:19px 22px;background:var(--card);border:1px solid var(--line);border-radius:8px}.chart-flow strong{color:var(--green)}.chart-flow span{font-size:15px}.lesson-glossary{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:25px 0}.lesson-glossary>section{padding:18px 21px;scroll-margin-top:100px}.lesson-glossary h2{font:650 19px var(--sans);margin:0 0 7px}.lesson-glossary p{font-size:14px;margin:0}.lesson-end{background:#f1f1e8;border-radius:9px;padding:25px!important;margin:30px 0}.lesson-end details{max-width:780px;background:var(--card);padding:17px 20px;border:1px solid var(--line);border-radius:7px}.lesson-end summary{cursor:pointer;font-weight:650}.lesson-end details p{margin-bottom:0}.lesson-next a{font-weight:700;font-size:18px}.lesson-end .caption{font-size:13px}
@media(max-width:700px){.lesson-methods,.lesson-glossary,.lesson-card-grid{grid-template-columns:1fr}.lesson-methods>section:last-child{grid-column:auto}.lesson-body>section{padding:23px 0}.lesson-body p{font-size:15px}.chart-flow>div{grid-template-columns:1fr;gap:5px}.lesson-end{padding:20px!important}}
.portal-watch-grid article { border: 1px solid #dce5dc; background: #fffdf8; border-radius: 14px; padding: 1.1rem; }
.portal-watch-grid article > a { display: block; text-decoration: none; color: inherit; }
.watch-notice{max-width:840px;padding:18px 22px;margin:16px 0 30px;border-left:3px solid var(--green);background:#e7edeb;color:var(--ink);line-height:1.65}.watch-notice strong{display:block;margin-bottom:3px}.lesson-sources{font-size:13px;color:var(--muted);border-top:1px solid var(--line);margin-top:28px}.lesson-sources h2{font:650 17px var(--sans);margin-bottom:8px}.lesson-sources ul{padding-left:19px;columns:2}.lesson-sources li{break-inside:avoid;margin:5px 0}.lesson-sources a{color:var(--green)}@media(max-width:700px){.lesson-sources ul{columns:1}}
.trade-waitlist { display: grid; gap: 1rem; max-width: 550px; padding: 1.4rem; border: 1px solid var(--line); border-radius: 10px; background: var(--card); }
.trade-waitlist label { display: block; font-weight: 650; }
.trade-waitlist input[type=email],.trade-waitlist input[type=text] { display: block; width: 100%; padding: .8rem; margin-top: .4rem; border: 1px solid #aebfaf; border-radius: 6px; font: inherit; }
.trade-waitlist .trade-consent { display: flex; align-items: flex-start; gap: .65rem; font-weight: 450; font-size: .9rem; }
.trade-consent input { margin-top: .25rem; }
.trade-waitlist .trade-trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.trade-waitlist button { justify-self: start; cursor: pointer; }

/* Shared spacing and interaction treatments for the reader-facing pages. */
.seo-breadcrumbs {
  display: block;
  margin: 22px 0 0;
  color: var(--muted);
}

.seo-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.seo-breadcrumbs li {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  font: 600 12px/1.4 var(--sans);
}

.seo-breadcrumbs li + li::before {
  content: '/';
  color: #89978c;
  margin: 0 10px;
}

.seo-breadcrumbs a {
  display: inline;
  padding: 0;
  color: var(--green);
  font: inherit;
  text-decoration: none;
  white-space: normal;
}

.seo-breadcrumbs a:hover { text-decoration: underline; }
.seo-breadcrumbs [aria-current='page'] { color: var(--muted); }
.seo-breadcrumbs + .page-intro { padding-top: 18px; }

.back-link {
  margin-top: 26px;
  font-weight: 650;
}
.back-link + .page-intro { padding-top: 16px; }

.portal-detail { padding-top: 0; }
.portal-detail h2:first-child { margin-top: 0; }
.portal-detail + .portal-next {
  border-top: 1px solid var(--line);
  margin-top: 20px;
}

.decision-question {
  margin-top: 24px;
  padding: 19px 23px 18px;
}
.decision-question legend {
  max-width: 100%;
  padding: 0 5px;
  line-height: 1.45;
}
.choice-buttons button {
  flex: 1 1 0;
  max-width: 180px;
}
.choice-buttons button[aria-pressed='true'],
.choice-buttons button[aria-pressed='true']:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: white;
}
#decision-feedback {
  border-top: 1px solid #c4d1bf;
  margin: 16px 0 0;
  min-height: 54px;
  padding-top: 12px;
}
.answer-key {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 7px;
  margin-top: 17px;
  padding: 14px 18px;
}
.answer-key[open] summary { margin-bottom: 4px; }
.calculator-result dl div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
}
.trade-waitlist .trade-consent { line-height: 1.5; }
.trade-consent input {
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
}

@media (max-width: 700px) {
  html { scroll-padding-top: 24px; }
  .seo-breadcrumbs { margin-top: 18px; }
  .seo-breadcrumbs li + li::before { margin: 0 8px; }
  .seo-breadcrumbs + .page-intro { padding-top: 17px; }
  .back-link { margin-top: 20px; }
  .back-link + .page-intro { padding-top: 14px; }
  .decision-question { padding: 17px 18px; }
  .lesson-glossary > section { scroll-margin-top: 24px; }
}