:root {
  --paper: #fff;
  --ink: #171716;
  --muted: #5c5c58;
  --line: #d8d8d2;
  --coral: #e85d4a;
  --coral-ink: #1a0f0d;
  --blue: #243b7a;
  --blue-dark: #172b62;
  --teal: #3c716a;
  --teal-pale: #eaf3f1;
  --warning: #a73126;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", "Helvetica Neue", Arial, sans-serif;
  --container: 1440px;
  --banner-height: 48px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--banner-height) + 16px); }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.55; }
a { color: var(--blue); text-underline-offset: 0.2em; }
a:hover { color: var(--blue-dark); }
button, input, select, textarea { font: inherit; }
button, .button { min-height: 44px; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
img, svg { max-width: 100%; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--serif); font-weight: 400; line-height: 1.02; }
h1 { font-size: clamp(2.5rem, 5vw, 5.4rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(2rem, 3.2vw, 3.5rem); letter-spacing: -0.025em; }
h3 { font-size: clamp(1.4rem, 2vw, 2rem); }

.skip-link { position: fixed; left: 16px; top: -100px; z-index: 2000; background: var(--paper); color: var(--ink); padding: 12px 16px; border: 2px solid var(--ink); }
.skip-link:focus { top: 8px; }
.case-study-banner { position: sticky; top: 0; z-index: 1000; min-height: var(--banner-height); display: grid; place-items: center; width: 100%; background: var(--coral); color: var(--coral-ink); border-bottom: 1px solid var(--coral-ink); text-align: center; }
.case-study-banner a { display: block; width: 100%; padding: 9px 20px 8px; color: inherit; font-weight: 800; letter-spacing: 0.08em; line-height: 1.25; text-decoration: none; }
.site-header { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 32px; max-width: var(--container); margin: 0 auto; padding: 0 32px; border-bottom: 1px solid var(--line); }
.wordmark { flex: 0 0 auto; color: var(--ink); font-family: var(--serif); font-size: 1.6rem; letter-spacing: 0.14em; text-decoration: none; }
.primary-navigation { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 40px); }
.primary-navigation a, .link-button { color: var(--ink); font-size: 0.9rem; text-decoration: none; border-bottom: 2px solid transparent; }
.primary-navigation a[aria-current="page"] { border-bottom-color: var(--blue); color: var(--blue); }
.primary-navigation a:hover, .link-button:hover { color: var(--blue); }
.primary-navigation .nav-cta { padding: 10px 16px; color: #fff; background: var(--blue); }
.nav-form { margin: 0; }
.link-button { min-height: auto; padding: 0; border: 0; background: none; cursor: pointer; }
.mobile-menu-button { display: none; padding: 6px 0; border: 0; background: none; color: var(--ink); }
.messages { max-width: var(--container); margin: 0 auto; padding: 16px 32px 0; }
.message { margin: 0; padding: 12px 16px; border: 1px solid var(--teal); background: var(--teal-pale); }

.container { width: min(100% - 64px, var(--container)); margin-inline: auto; }
.narrow { width: min(100% - 40px, 860px); margin-inline: auto; }
.section { padding-block: clamp(64px, 8vw, 112px); border-bottom: 1px solid var(--line); }
.section-compact { padding-block: 40px; border-bottom: 1px solid var(--line); }
.kicker { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.lede { max-width: 760px; color: #30302e; font-size: clamp(1.05rem, 1.6vw, 1.35rem); }
.muted { color: var(--muted); }
.fine-print { color: var(--muted); font-size: 0.82rem; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; padding: 11px 20px; border: 1px solid var(--blue); border-radius: 2px; color: var(--blue); background: var(--paper); font-weight: 600; text-decoration: none; cursor: pointer; }
.button-primary { color: #fff; background: var(--blue); }
.button-primary:hover { color: #fff; background: var(--blue-dark); }
.button-coral { color: var(--coral-ink); border-color: var(--coral); background: var(--coral); }

.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr); gap: clamp(48px, 8vw, 120px); align-items: center; min-height: min(720px, calc(100vh - 120px)); padding-block: clamp(72px, 9vw, 132px); }
.hero h1 { max-width: 850px; }
.hero-copy { max-width: 650px; }
.branch-map { min-height: 360px; display: grid; place-items: center; }
.branch-map svg { width: 100%; overflow: visible; }
.branch-map line, .branch-map path { fill: none; stroke: var(--blue); stroke-width: 1.5; }
.branch-map .teal-line { stroke: var(--teal); }

.question-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.question-item { min-height: 230px; padding: 28px 32px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--teal); }
.question-item:last-child { border-right: 0; }
.question-item h3 { max-width: 360px; }
.item-number { color: var(--teal); font-size: 0.8rem; font-weight: 700; }

.editorial-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.editorial-list li, .editorial-row { display: grid; grid-template-columns: 80px minmax(220px, 1fr) minmax(240px, 1fr) 44px; align-items: center; min-height: 76px; border-bottom: 1px solid var(--line); }
.editorial-list li:hover { background: #f8f9fc; }
.editorial-list .number { align-self: stretch; display: grid; place-items: center; color: var(--blue); font-family: var(--serif); font-size: 2.2rem; border-right: 1px solid var(--line); }
.editorial-list h3, .editorial-list p { margin: 0; padding: 12px 24px; }
.editorial-list .arrow { font-size: 1.4rem; text-align: center; }

.workflow { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.workflow-step { min-height: 260px; padding: 24px; border-right: 1px solid var(--line); }
.workflow-step:last-child { border-right: 0; }
.step-label { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; font-size: 0.83rem; font-weight: 600; }
.step-number { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; color: #fff; background: var(--teal); }
.mini-bars { display: grid; gap: 14px; margin-top: 24px; }
.mini-bar { height: 6px; background: #ecece8; }
.mini-bar span { display: block; height: 100%; background: var(--teal); }

.claim-layout { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.7fr); gap: 56px; }
.claim-block { margin-bottom: 30px; border-top: 2px solid var(--ink); padding-top: 14px; }
.claim-block.source-claim { border-color: var(--teal); }
.claim-block.interpretation { border-color: var(--blue); }
.claim-label { display: inline-block; margin: -14px 0 14px; padding: 4px 9px; color: #fff; background: var(--ink); font-size: 0.73rem; font-weight: 800; letter-spacing: 0.08em; }
.source-claim .claim-label { background: var(--teal); }
.interpretation .claim-label { background: var(--blue); }
.educational-proposal .claim-label { color: var(--ink); background: var(--paper); border: 1px solid var(--ink); }
.open-question .claim-label { padding-left: 0; color: var(--ink); background: none; }
.external-context { border-color: #68738c; }
.external-context .claim-label { background: #68738c; }
.source-meta { padding: 20px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.source-state { font-size: 0.75rem; font-weight: 800; letter-spacing: 0.05em; text-transform: uppercase; }
.source-state.rag-approved { color: var(--teal); }
.source-state.reference-only { color: var(--blue); }
.source-state.pending-review { color: var(--warning); }

.library-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.library-table th, .library-table td { padding: 15px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.library-table th { font-size: 0.72rem; letter-spacing: 0.07em; text-transform: uppercase; }
.filter-form { display: grid; grid-template-columns: 1fr 220px 180px auto; gap: 12px; margin: 32px 0; }

.site-footer { max-width: var(--container); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 24px 32px; font-size: 0.75rem; border-top: 1px solid var(--ink); }
.site-footer p { margin: 0; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 24px; }
.site-footer a { color: var(--ink); }

.app-page { display: grid; grid-template-columns: 240px minmax(0, 1fr); max-width: var(--container); margin: 0 auto; }
.app-rail { min-height: calc(100vh - 120px); padding: 40px 24px 64px 32px; border-right: 1px solid var(--line); }
.app-rail ul { margin: 0; padding: 0; list-style: none; }
.app-rail li { margin-bottom: 4px; }
.app-rail a, .app-rail .rail-item { display: block; padding: 12px 10px; color: var(--ink); text-decoration: none; border-left: 3px solid transparent; }
.app-rail a[aria-current="page"], .app-rail .current { color: var(--teal); border-left-color: var(--coral); font-weight: 600; }
.app-content { min-width: 0; padding: clamp(40px, 5vw, 80px); }
.app-content h1 { font-size: clamp(2.6rem, 5vw, 5rem); }
.app-disclosure { padding: 12px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--muted); font-size: 0.88rem; }

.dashboard-intro { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.6fr); gap: 56px; align-items: center; padding-bottom: 44px; border-bottom: 1px solid var(--line); }
.dashboard-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; padding: 32px 0; border-bottom: 1px solid var(--line); }
.dimension-list { margin: 0; padding: 0; list-style: none; }
.dimension-list li { display: grid; grid-template-columns: minmax(180px, 1fr) 100px 1fr; gap: 16px; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line); }
.affinity { height: 6px; background: #ecece8; }
.affinity span { display: block; height: 100%; background: var(--teal); }
.recommendation-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--line); }
.recommendation { padding: 28px 28px 28px 0; border-bottom: 1px solid var(--line); }
.recommendation + .recommendation { padding-left: 28px; border-left: 1px solid var(--line); }

.form-page { padding-block: 72px 96px; }
.form-shell { width: min(100%, 660px); }
.form-shell form > p { margin: 0 0 22px; }
.form-shell label, .field-label { display: block; margin-bottom: 7px; font-weight: 600; }
input[type="text"], input[type="email"], input[type="password"], input[type="search"], select, textarea { width: 100%; min-height: 46px; padding: 10px 12px; color: var(--ink); background: var(--paper); border: 1px solid #969690; border-radius: 2px; }
textarea { min-height: 120px; resize: vertical; }
.helptext { display: block; margin-top: 6px; color: var(--muted); font-size: 0.8rem; }
.errorlist { color: var(--warning); }

.compass-shell { display: grid; grid-template-columns: 280px minmax(0, 1fr); max-width: var(--container); margin: 0 auto; }
.compass-rail { padding: 40px 28px; border-right: 1px solid var(--line); }
.dimension-step { position: relative; padding: 14px 8px 14px 38px; color: var(--muted); }
.dimension-step::before { content: ""; position: absolute; left: 8px; top: 22px; width: 12px; height: 12px; border: 1px solid var(--muted); border-radius: 50%; background: var(--paper); }
.dimension-step.current { color: var(--teal); font-weight: 600; }
.dimension-step.current::before { border: 4px solid var(--teal); }
.compass-main { min-width: 0; padding: clamp(40px, 5vw, 72px); }
.compass-topline { display: flex; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.progress-track { width: 280px; max-width: 100%; height: 4px; background: var(--line); }
.progress-track span { display: block; height: 100%; background: var(--blue); }
.prompt-layout { display: grid; grid-template-columns: 88px minmax(0, 780px); gap: 28px; margin-top: 44px; }
.prompt-number { font-family: var(--serif); font-size: 4.5rem; line-height: 1; }
.prompt-title { font-family: var(--serif); font-size: clamp(2rem, 3.5vw, 3.4rem); line-height: 1.08; }
.help-disclosure { margin: 18px 0; }
.help-disclosure summary { color: var(--blue); cursor: pointer; font-weight: 600; }
.response-list { margin: 24px 0 10px; }
.response-list > div { margin-bottom: 8px; }
.response-list label { display: flex; align-items: center; gap: 14px; min-height: 50px; padding: 10px 16px; border: 1px solid #9a9a95; cursor: pointer; }
.response-list label:has(input:checked) { border: 2px solid var(--teal); background: var(--teal-pale); }
.response-list input { width: 20px; height: 20px; accent-color: var(--teal); }
.usage-note { display: grid; grid-template-columns: 1fr auto; gap: 20px; margin: 28px 0; padding: 18px; border: 1px solid var(--teal); }
.compass-actions { display: flex; justify-content: space-between; gap: 16px; padding-top: 24px; border-top: 1px solid var(--line); }

.profile-dimensions { display: grid; gap: 0; margin: 32px 0 64px; border-top: 1px solid var(--line); }
.profile-dimension { display: grid; grid-template-columns: minmax(220px, 1fr) 120px minmax(140px, 1fr); gap: 24px; align-items: center; padding: 18px 0; border-bottom: 1px solid var(--line); }

.lesson-shell { display: grid; grid-template-columns: 250px minmax(0, 1fr); max-width: var(--container); margin: 0 auto; }
.lesson-rail { padding: 40px 22px 64px 32px; border-right: 1px solid var(--line); }
.lesson-rail ol { padding-left: 24px; }
.lesson-rail li { padding: 10px 5px; }
.lesson-rail .current { color: var(--blue); font-weight: 600; background: #f3f6fc; }
.lesson-main { min-width: 0; padding: clamp(36px, 4vw, 64px); }
.lesson-main h1 { max-width: 980px; font-size: clamp(2.8rem, 5vw, 5.3rem); }
.lesson-columns { display: grid; grid-template-columns: minmax(0, 760px) minmax(320px, 380px); gap: 48px; align-items: start; }
.lesson-body { font-size: 1.07rem; }
.lesson-body .claim-block { margin: 36px 0; }
.tutor-panel { position: sticky; top: calc(var(--banner-height) + 24px); padding: 28px; border: 1px solid var(--ink); }
.tutor-panel h2 { font-family: var(--sans); font-size: 1.6rem; font-weight: 700; }
.ai-answer { padding: 20px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.evidence-list { margin: 20px 0; padding: 0; list-style: none; border: 1px solid var(--ink); }
.evidence-list li { padding: 16px; border-bottom: 1px solid var(--line); }
.evidence-list li:last-child { border-bottom: 0; }
.ai-warning { color: var(--warning); font-weight: 600; }
.configuration-state { padding: 24px; border: 1px solid var(--coral); background: #fff8f6; }

.error-page { min-height: 65vh; display: grid; align-content: center; padding-block: 80px; }
.error-code { color: var(--coral); font-family: var(--serif); font-size: 5rem; }

@media (max-width: 980px) {
  .site-header { min-height: 64px; padding-inline: 20px; }
  .mobile-menu-button { display: inline-block; }
  .primary-navigation { display: none; position: absolute; z-index: 900; left: 20px; right: 20px; top: calc(var(--banner-height) + 64px); align-items: stretch; flex-direction: column; gap: 0; padding: 16px; border: 1px solid var(--ink); background: var(--paper); box-shadow: 0 12px 28px rgba(0,0,0,.08); }
  .primary-navigation.is-open { display: flex; }
  .primary-navigation a, .nav-form { padding: 12px 4px; }
  .container { width: min(100% - 40px, var(--container)); }
  .hero { grid-template-columns: 1fr; gap: 20px; min-height: auto; }
  .branch-map { min-height: 220px; }
  .question-grid { grid-template-columns: 1fr; }
  .question-item { min-height: auto; border-right: 0; }
  .editorial-list li, .editorial-row { grid-template-columns: 58px minmax(0, 1fr) 38px; }
  .editorial-list p { grid-column: 2; padding-top: 0; }
  .editorial-list .arrow { grid-column: 3; grid-row: 1 / span 2; }
  .workflow { grid-template-columns: 1fr 1fr; }
  .workflow-step:nth-child(2) { border-right: 0; }
  .workflow-step { border-bottom: 1px solid var(--line); }
  .claim-layout, .dashboard-intro, .dashboard-grid, .lesson-columns { grid-template-columns: 1fr; }
  .filter-form { grid-template-columns: 1fr 1fr; }
  .app-page, .compass-shell, .lesson-shell { grid-template-columns: minmax(0, 1fr); }
  .app-rail, .compass-rail, .lesson-rail { min-width: 0; min-height: auto; padding: 18px 20px; border-right: 0; border-bottom: 1px solid var(--line); }
  .app-rail { overflow: hidden; }
  .app-rail ul { width: 100%; min-width: 0; display: flex; gap: 8px; overflow-x: auto; }
  .app-rail a { white-space: nowrap; }
  .compass-rail .dimension-step:not(.current) { display: none; }
  .lesson-rail ol { display: none; }
  .lesson-main, .app-content, .compass-main { min-width: 0; padding: 40px 20px 72px; }
  .prompt-layout { grid-template-columns: 1fr; gap: 8px; }
  .prompt-number { font-size: 2rem; color: var(--blue); }
  .tutor-panel { position: static; }
  .site-footer { align-items: flex-start; flex-direction: column; padding-inline: 20px; }
}

@media (max-width: 640px) {
  :root { --banner-height: 42px; }
  .case-study-banner a { padding: 8px 12px; font-size: 0.78rem; letter-spacing: 0.06em; }
  .wordmark { font-size: 1.25rem; }
  h1 { font-size: clamp(2.7rem, 13vw, 4.2rem); }
  .section { padding-block: 64px; }
  .hero { padding-block: 56px; }
  .button-row { flex-direction: column; align-items: stretch; }
  .button-row .button { width: 100%; }
  .workflow, .recommendation-grid { grid-template-columns: 1fr; }
  .workflow-step { border-right: 0; }
  .recommendation + .recommendation { padding-left: 0; border-left: 0; }
  .claim-layout { gap: 32px; }
  .library-table, .library-table tbody, .library-table tr, .library-table td { display: block; }
  .library-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .library-table tr { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .library-table td { display: grid; grid-template-columns: 110px 1fr; gap: 12px; padding: 6px 0; border: 0; }
  .library-table td::before { content: attr(data-label); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; }
  .filter-form { grid-template-columns: 1fr; }
  .compass-topline { flex-direction: column; }
  .compass-rail { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; align-items: center; padding-block: 10px; }
  .compass-rail .kicker, .compass-rail hr { display: none; }
  .compass-rail .dimension-step.current { grid-row: 1 / span 2; margin: 0; padding-block: 8px; }
  .compass-rail p { margin: 0; font-size: .78rem; text-align: right; }
  .compass-main { padding-top: 28px; }
  .compass-main h1 { font-size: 2.65rem; margin-bottom: 16px; }
  .compass-instructions { display: none; }
  .compass-main .app-disclosure { font-size: .78rem; }
  .prompt-layout { margin-top: 28px; }
  .prompt-title { font-size: 2rem; }
  .usage-note, .profile-dimension, .dimension-list li { grid-template-columns: 1fr; }
  .compass-actions { align-items: stretch; flex-direction: column-reverse; }
  .compass-actions .button { width: 100%; }
  .lesson-main h1 { font-size: clamp(2.7rem, 12vw, 4.1rem); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}