/* Public research invitation. No product UI or client information. */
:root {
  color-scheme: light dark;
  --page-bg: #f6f8f5;
  --surface: #fdfefb;
  --surface-muted: #eaf0e7;
  --text: #183d32;
  --text-muted: #506259;
  --rule: #cbd5cb;
  --brand: #174f3e;
  --brand-deep: #0d382b;
  --accent: #d9f56f;
  --accent-ink: #173128;
  --action-bg: #174f3e;
  --action-text: #fdfefb;
  --error: #872f24;
  --focus: #174f3e;
  --radius: 12px;
  --ink: var(--text);
  --muted: var(--text-muted);
  --paper: var(--page-bg);
  --line: var(--rule);
}

body { background: var(--page-bg); color: var(--text); }
h1, h2, h3, p, dl, dd { margin-top: 0; }
p, li, dd { overflow-wrap: anywhere; }
section { scroll-margin-top: 32px; }
.wrap { width: min(1200px, calc(100% - 80px)); }
.site-header { height: 80px; border-bottom: 0; }
.brand { font-size: 2.2rem; letter-spacing: -.075em; }
.brand > span { color: var(--brand); }
.site-header nav { gap: 32px; }
.site-header nav a { font-size: .88rem; }

.skip-link {
  position: fixed;
  z-index: 2;
  top: 12px;
  left: 12px;
  padding: 12px 18px;
  transform: translateY(-180%);
  border-radius: var(--radius);
  background: var(--action-bg);
  color: var(--action-text);
  font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }

.nav-cta,
.button,
.notify-button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 0 24px;
  border: 1px solid var(--action-bg);
  border-radius: var(--radius);
  background: var(--action-bg);
  color: var(--action-text);
  font-weight: 650;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 120ms ease, transform 120ms ease;
}
.nav-cta { min-height: 44px; padding-inline: 18px; }
.nav-cta:hover,
.button:hover,
.notify-button:hover { background: var(--brand-deep); text-decoration: none; }
.nav-cta:active,
.button:active,
.notify-button:active { transform: translateY(1px); }
.button > span { font-size: 1.3rem; font-weight: 400; }

.hero { padding: 68px 0 0; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  align-items: center;
  gap: 76px;
}
.eyebrow { margin-bottom: 24px; color: var(--brand); font-size: .9rem; font-weight: 650; }
h1 {
  margin-bottom: 28px;
  font-size: clamp(3.2rem, 5.7vw, 5.1rem);
  font-weight: 650;
  line-height: 1.04;
  letter-spacing: -.064em;
}
h1 span { color: var(--brand); }
.hero-lead { max-width: 49ch; margin-bottom: 16px; font-size: 1.15rem; line-height: 1.6; }
.hero-proposal { max-width: 50ch; margin-bottom: 30px; color: var(--text-muted); font-size: 1rem; }
.hero-action { display: flex; align-items: center; gap: 22px; }
.hero-action p { margin: 0; color: var(--text-muted); font-size: .78rem; }

.session-invitation {
  padding: 30px;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-ink);
}
.invitation-label { margin-bottom: 22px; font-size: .85rem; line-height: 1.4; }
.session-duration { margin-bottom: 16px; font-size: 6.3rem; font-weight: 600; line-height: .95; letter-spacing: -.08em; }
.session-duration span { font-size: 1rem; font-weight: 500; letter-spacing: -.02em; }
.invitation-copy { margin-bottom: 26px; font-size: 1.65rem; line-height: 1.15; font-weight: 600; letter-spacing: -.035em; }
.session-facts { margin-bottom: 0; }
.session-facts div { padding-top: 14px; border-top: 1px solid #a7bf62; }
.session-facts div + div { margin-top: 16px; }
.session-facts dt { margin-bottom: 4px; font-size: .74rem; }
.session-facts dd { margin: 0; font-size: .85rem; font-weight: 600; }
.hero-audience { margin: 58px 0 0; padding: 26px 0; border-top: 1px solid var(--rule); color: var(--text-muted); font-size: .83rem; text-align: center; }
.hero-audience strong { color: var(--text); font-weight: 600; }

.workflow { padding: 88px 0; background: var(--surface); }
.section-intro { display: grid; grid-template-columns: 1.2fr 1fr; gap: 80px; align-items: end; margin-bottom: 40px; }
.section-label { margin-bottom: 14px; color: var(--brand); font-size: .85rem; font-weight: 650; }
h2 { margin-bottom: 0; font-size: clamp(2.2rem, 3.35vw, 3rem); font-weight: 600; line-height: 1.1; letter-spacing: -.047em; }
.section-intro > p { margin: 0; color: var(--text-muted); font-size: .96rem; }
.scenario-summary {
  display: grid;
  grid-template-columns: 170px 1fr 1fr;
  gap: 32px;
  align-items: start;
  padding: 24px 0;
  border-block: 1px solid var(--rule);
}
.scenario-summary > p:first-child { margin: 0; color: var(--text-muted); font: .72rem/1.6 var(--font-mono); }
.scenario-summary h3 { margin: 0; font-size: 1.12rem; line-height: 1.4; font-weight: 600; letter-spacing: -.02em; }
.scenario-summary > p:last-child { margin: 0; color: var(--text-muted); font-size: .88rem; }
.comparison { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 64px; padding-top: 40px; }
.current-work { padding-top: 24px; }
.current-work header,
.proposed-work header { margin-bottom: 24px; }
.current-work h3,
.proposed-work h3 { margin-bottom: 10px; font-size: 1.55rem; font-weight: 600; line-height: 1.15; letter-spacing: -.035em; }
.current-work header p { margin: 0; color: var(--text-muted); font-size: .85rem; }
.workflow-steps { margin: 0; padding: 0; list-style: none; counter-reset: workflow-step; }
.workflow-steps li { position: relative; padding: 0 0 24px 43px; counter-increment: workflow-step; }
.workflow-steps li:not(:last-child)::after { position: absolute; top: 27px; bottom: 0; left: 12px; border-left: 1px solid var(--rule); content: ''; }
.workflow-steps li::before {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  color: var(--brand);
  content: counter(workflow-step);
  font: .75rem/1 var(--font-mono);
}
.workflow-steps strong { display: block; margin-bottom: 4px; font-size: .95rem; font-weight: 600; }
.workflow-steps span { display: block; max-width: 42ch; color: var(--text-muted); font-size: .86rem; }
.proposed-work { align-self: start; padding: 28px 32px; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--page-bg); }
.proposed-work header > p { margin-bottom: 12px; color: var(--brand); font-size: .78rem; font-weight: 650; }
.proposed-work header > span { display: block; color: var(--text-muted); font-size: .81rem; }
.review-map { margin: 0; }
.review-map div { display: grid; grid-template-columns: 125px minmax(0, 1fr); gap: 22px; padding: 15px 0; border-top: 1px solid var(--rule); }
.review-map dt { font-size: .8rem; font-weight: 650; }
.review-map dd { margin: 0; color: var(--text-muted); font-size: .84rem; }
.review-map .human-row { margin-top: 5px; padding: 16px; border: 0; border-radius: var(--radius); background: var(--surface-muted); }
.review-map .human-row dt { color: var(--brand); }

.research-tests { padding: 80px 0; border-top: 1px solid var(--rule); }
.research-tests > .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 36px 80px; }
.tests-intro h2 { max-width: 16ch; }
.tests-intro p { max-width: 48ch; margin: 24px 0 0; color: var(--text-muted); }
.test-questions { margin: 0; padding: 0; list-style: none; }
.test-questions li { padding: 16px 0; border-bottom: 1px solid var(--rule); font-size: .96rem; }
.test-questions li:first-child { padding-top: 0; }
.audience-prompts { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.audience-prompts div { border-top: 1px solid var(--rule); padding-top: 22px; }
.audience-prompts h3 { margin-bottom: 8px; font-size: .95rem; font-weight: 650; }
.audience-prompts p { max-width: 51ch; margin: 0; color: var(--text-muted); font-size: .9rem; }
.audience-prompts p + p { margin-top: 12px; }
.human-boundary { grid-column: 1 / -1; display: grid; grid-template-columns: 210px 1fr; gap: 32px; padding: 24px 28px; border-radius: var(--radius); background: var(--surface-muted); }
.human-boundary strong { font-size: .9rem; }
.human-boundary p { margin: 0; color: var(--text-muted); font-size: .86rem; }

.research { padding: 80px 0; border-top: 1px solid var(--rule); background: var(--surface); }
.research-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.research h2 { max-width: 14ch; }
.research-copy { margin: 22px 0 0; color: var(--text-muted); font-size: .96rem; }
.session-steps { margin: 28px 0 0; padding: 0; list-style: none; }
.session-steps li { display: grid; grid-template-columns: 64px 1fr; gap: 16px; padding: 12px 0; border-top: 1px solid var(--rule); }
.session-steps strong { font-size: .84rem; font-weight: 650; }
.session-steps span { font-size: .88rem; }
.trust-boundary { margin-top: 28px; }
.trust-boundary h3 { margin-bottom: 10px; font-size: .88rem; font-weight: 650; }
.trust-boundary ul { margin: 0; padding-left: 18px; color: var(--text-muted); font-size: .8rem; }
.trust-boundary li + li { margin-top: 5px; }
.notify-form { padding: 36px; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--page-bg); }
.notify-form[aria-busy="true"] { border-color: var(--brand); }
.notify-form h3 { max-width: 20ch; margin-bottom: 12px; font-size: 1.8rem; font-weight: 600; line-height: 1.15; letter-spacing: -.035em; }
.notify-form > p { color: var(--text-muted); font-size: .9rem; }
.notify-label { display: block; margin: 28px 0 8px; font-size: .83rem; font-weight: 650; }
.notify-fields { display: grid; grid-template-columns: 1fr; gap: 12px; }
.notify-fields input { width: 100%; min-width: 0; min-height: 52px; padding: 12px 16px; border: 1px solid var(--text-muted); border-radius: var(--radius); background: var(--surface); color: var(--text); }
.notify-fields input::placeholder { color: var(--text-muted); opacity: 1; }
.notify-button { cursor: pointer; }
.notify-button:disabled { border-color: var(--rule); background: var(--surface-muted); color: var(--text); cursor: wait; transition: none; }
.notify-status { min-height: 1.5em; margin: 12px 0 0 !important; color: var(--error) !important; font-size: .82rem !important; font-weight: 650; }
.notify-status:focus { outline: 3px solid var(--focus); outline-offset: 3px; }
.consent-note { margin: 8px 0 0 !important; color: var(--text-muted) !important; font-size: .78rem !important; line-height: 1.65; }
.form-trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.site-footer { padding-block: 32px; font-family: var(--font-sans); font-size: .78rem; }
.site-footer .wrap { display: flex; align-items: center; gap: 30px; }
.site-footer .brand { color: var(--text); }
.site-footer .wrap > a:last-child { margin-left: auto; }

@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: #10241e;
    --surface: #152d25;
    --surface-muted: #213d32;
    --text: #eef2e9;
    --text-muted: #bdcbc1;
    --rule: #486054;
    --brand: #d9f56f;
    --brand-deep: #e4fa9c;
    --action-bg: #d9f56f;
    --action-text: #173128;
    --error: #ffb4a7;
    --focus: #d9f56f;
  }
}

@media (max-width: 1100px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) 300px; gap: 32px; }
  h1 { font-size: clamp(2.9rem, 5.5vw, 4.5rem); }
  .session-invitation { padding: 26px; }
  .hero-action { align-items: flex-start; flex-direction: column; gap: 12px; }
  .section-intro,
  .comparison,
  .research-grid,
  .research-tests > .wrap,
  .audience-prompts { gap: 36px; }
  .scenario-summary { grid-template-columns: 1fr 1fr; gap: 16px 36px; }
  .scenario-summary > p:first-child { grid-column: 1 / -1; }
  .review-map div { grid-template-columns: 1fr; gap: 5px; }
}

@media (max-width: 900px) {
  .comparison { grid-template-columns: 1fr; }
  .current-work { padding-top: 0; }
  .review-map div { grid-template-columns: 150px 1fr; gap: 22px; }
}

@media (max-width: 767px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { height: 72px; gap: 16px; }
  .site-header nav { gap: 18px; }
  .site-header nav a { font-size: .8rem; }
  .nav-cta { padding-inline: 14px; }
  .hero { padding-top: 40px; }
  .hero-grid,
  .section-intro,
  .scenario-summary,
  .research-tests > .wrap,
  .audience-prompts,
  .human-boundary,
  .research-grid { grid-template-columns: 1fr; }
  .hero-grid { gap: 36px; }
  h1 { font-size: clamp(2.6rem, 8.7vw, 4.1rem); margin-bottom: 24px; }
  .eyebrow { margin-bottom: 20px; font-size: .8rem; }
  .hero-lead { font-size: 1.04rem; }
  .hero-proposal { font-size: .94rem; }
  .hero-action { flex-direction: row; align-items: center; gap: 16px; }
  .hero-action .button { padding-inline: 18px; gap: 16px; font-size: .85rem; }
  .hero-action p { font-size: .7rem; }
  .session-invitation { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 24px; }
  .invitation-label { margin: 0; }
  .session-duration { grid-column: 1; margin: 0; font-size: 5rem; }
  .session-duration span { display: block; margin-top: 8px; font-size: .9rem; }
  .invitation-copy { grid-column: 2; grid-row: 1; margin: 0; font-size: 1.2rem; }
  .session-facts { grid-column: 2; grid-row: 2; }
  .session-facts dt { font-size: .7rem; }
  .session-facts dd { font-size: .76rem; }
  .hero-audience { margin-top: 36px; padding-block: 24px; font-size: .77rem; text-align: left; }
  .workflow,
  .research-tests,
  .research { padding-block: 56px; }
  .section-intro { gap: 22px; margin-bottom: 28px; }
  .scenario-summary { gap: 14px; }
  .comparison { padding-top: 28px; gap: 28px; }
  .proposed-work { padding: 24px; }
  .review-map div { grid-template-columns: 1fr; gap: 5px; }
  .tests-intro h2 { max-width: 18ch; }
  .audience-prompts { gap: 24px; }
  .human-boundary { padding: 24px; gap: 10px; }
  .notify-form { padding: 26px; }
  .site-footer .wrap { flex-wrap: wrap; gap: 16px 24px; }
  .site-footer .wrap > span { flex: 1; min-width: 180px; }
  .site-footer .wrap > a:last-child { margin-left: 0; }
}

@media (max-width: 359px) {
  .nav-concept { display: none; }
  .hero-action { flex-direction: column; align-items: flex-start; }
  .session-invitation { padding: 20px; gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .nav-cta,
  .button,
  .notify-button { transform: none !important; }
}