/* layout.css - ARC mobile-first composition and section rhythm */

.container {
  width: min(var(--content-max-width), calc(100% - var(--space-40)));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-64);
}

.section--builder-intro,
.section--builders,
.section--process,
.section--evaluation,
.section--industry,
.section--secondary-form {
  position: relative;
}

.section--tight {
  padding-block: var(--space-48);
}

.section--airy {
  padding-block: var(--space-80);
}

.section--process,
.section--evaluation {
  padding-block: var(--space-80);
}

.section--dark {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--header-height) + var(--space-24));
  background:
    radial-gradient(circle at 18% 14%, #1f3854 0%, transparent 35%),
    radial-gradient(circle at 92% 24%, #17314c 0%, transparent 42%),
    linear-gradient(180deg, #081221 0%, #0f1b2d 100%);
}

.section--alt {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
}

.section--transition {
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
  background: rgba(255, 255, 255, 0.015);
}

.section--form {
  background:
    linear-gradient(180deg, rgba(102, 126, 234, 0.12) 0%, rgba(102, 126, 234, 0.06) 100%);
}

.section-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border-glass), transparent);
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-mono-label);
  font-weight: var(--fw-medium);
  color: var(--accent-violet);
  padding: var(--space-4) var(--space-12);
  border-radius: var(--radius-pill);
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.15);
  margin-bottom: var(--space-20);
}

.section-kicker + .section__heading,
.section-kicker + .section-header {
  margin-top: var(--space-4);
}

.section__heading,
.section-header {
  font-size: var(--fs-display-lg);
  font-weight: var(--fw-bold);
  letter-spacing: -0.03em;
  line-height: var(--lh-heading);
  margin-bottom: var(--space-24);
}

.section__subtext {
  max-width: 70ch;
  margin-bottom: var(--space-32);
  color: var(--text-grey);
}

.subsection-heading {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  font-size: var(--fs-heading-md);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-12);
  line-height: var(--lh-heading);
}

.subsection-heading::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, rgba(34, 211, 238, 0.45), transparent);
}

.section-lead {
  max-width: 100%;
  margin-bottom: var(--space-24);
  color: #d4dcec;
}

.domain-note {
  width: 100%;
  max-width: 100%;
  margin-bottom: var(--space-24);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: linear-gradient(
    180deg,
    rgba(15, 20, 31, 0.9) 0%,
    rgba(11, 16, 26, 0.86) 100%
  );
  padding: var(--space-20) var(--space-24);
  position: relative;
  overflow: hidden;
  display: grid;
  gap: var(--space-12);
}

.domain-note::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.52), rgba(34, 211, 238, 0.12) 58%, transparent 100%);
}

.domain-note__eyebrow {
  margin: 0;
  color: #d8f7ff;
  font-size: var(--fs-ui-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.4;
}

.domain-note__text {
  margin: 0;
  max-width: 64ch;
  color: var(--text-grey);
  line-height: 1.6;
}

.hero-shell {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-24);
  align-items: start;
}

.hero {
  position: relative;
}

.hero-main {
  text-align: left;
}

.hero__brand-label {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: var(--radius-pill);
  padding: var(--space-6) var(--space-12);
  margin-bottom: var(--space-16);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: var(--fs-meta);
  color: #c1d1e4;
}

.hero__headline {
  font-family: var(--font-display);
  font-size: clamp(2.08rem, 5.95vw, 3.91rem);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: -0.04em;
  color: var(--text-white);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .hero__headline-accent {
    background: linear-gradient(135deg, #ff7ac8 0%, #ff4f7a 55%, #ff3347 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
  }
}

.hero__headline-accent {
  color: #ff63ad;
}

.hero__subline {
  margin-top: var(--space-20);
  margin-bottom: var(--space-24);
  max-width: 67ch;
  color: #cad8e7;
  font-size: var(--fs-body-lg);
  line-height: var(--lh-body);
}

.hero__cta-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.overview-grid,
.steps-list,
.value-points,
.eval-dimensions,
.nominations,
.proof-signals,
.enterprise-groups,
.action-cards,
.post-register-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-16);
}

.semantic-stack {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-16);
  align-items: start;
}

.semantic-stack > * {
  margin: 0;
  max-width: 100%;
}

.semantic-stack > .subsection-heading {
  margin-bottom: 0;
}

.semantic-stack > .pipeline-strip,
.semantic-stack > .compliance-callout,
.semantic-stack > .domain-note {
  width: 100%;
}

.overview-grid + .problem-statement,
.pipeline-strip + .compliance-callout,
.compliance-callout + .domain-note,
.proof-signals + details,
.nominations + .soft-cta {
  margin-top: var(--space-16);
}

.section__subtext + .overview-grid,
.section__subtext + .value-points,
.section__subtext + .registration-layout,
.section__subtext + .faq-list {
  margin-top: var(--space-8);
}

.section-lead + .steps-list {
  margin-top: var(--space-10);
}

.feature-card,
.overview-card,
.value-point,
.step-card,
.eval-dimension,
.nomination-badge,
.info-card,
.enterprise-group,
.proof-panel,
.registration-copy,
.registration-form-surface,
.action-card,
.submission-confirm,
.section-intro {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
}

.overview-card,
.value-point,
.step-card,
.eval-dimension,
.nomination-badge,
.proof-panel,
.enterprise-group,
.registration-copy,
.section-intro,
.action-card,
.submission-confirm {
  padding: var(--space-28);
}

.eval-dimension {
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

.eval-dimension p {
  margin: 0;
}

.section-intro {
  border-color: rgba(34, 211, 238, 0.2);
  background: rgba(34, 211, 238, 0.04);
}

.step-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.step-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.step-badge {
  width: var(--space-32);
  height: var(--space-32);
  border-radius: var(--radius-pill);
  background: rgba(139, 92, 246, 0.18);
  border: 1px solid rgba(139, 92, 246, 0.35);
  color: #d7ddff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--fw-semibold);
  font-size: var(--fs-ui-sm);
}

.step-card__label,
.value-point__title,
.eval-dimension__label,
.task-example__title,
.eval-detail-item__title,
.participation-mode__title {
  font-weight: var(--fw-semibold);
  font-size: var(--fs-heading-md);
  color: var(--text-white);
  line-height: var(--lh-heading);
}

.step-card__desc,
.domain-note,
.section-lead,
.registration-note,
.activation-link__desc,
.cta-note,
.footer__copy,
.soft-cta,
.json-workflow__text,
.json-workflow__status,
.proof-signal__label {
  color: var(--text-grey);
  font-size: var(--fs-body-sm);
  line-height: var(--lh-body);
}

.problem-statement,
.compliance-callout,
.section-intro--bordered {
  display: block;
  width: 100%;
  border-left: 3px solid var(--accent-violet);
  background: rgba(139, 92, 246, 0.08);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-16) var(--space-18);
}

.problem-statement__title {
  display: block;
  margin-bottom: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--fs-ui-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #e4cbff;
}

.problem-statement p {
  font-size: 1.08rem;
  font-weight: var(--fw-medium);
  line-height: 1.72;
  color: #e2e8f7;
}

.proof-panel {
  border-color: rgba(34, 211, 238, 0.28);
  background: linear-gradient(
    180deg,
    rgba(8, 26, 42, 0.72) 0%,
    rgba(10, 22, 38, 0.66) 100%
  );
  box-shadow: inset 0 0 0 1px rgba(34, 211, 238, 0.08);
}

.section--evaluation .proof-panel {
  margin-top: var(--space-28);
}

.pipeline-strip {
  border: 1px dashed rgba(139, 92, 246, 0.45);
  border-radius: var(--radius-md);
  padding: var(--space-16);
  margin-bottom: var(--space-16);
  color: #d5e5f7;
  background: rgba(15, 31, 50, 0.45);
  font-family: var(--font-mono);
  font-size: var(--fs-ui-sm);
  line-height: var(--lh-ui);
  overflow-wrap: anywhere;
}

.meta-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-28) 0;
}

.meta-grid .info-card {
  border: 0;
  border-radius: 0;
  background: var(--bg-elevated);
  padding: var(--space-20);
}

.logistics-bar__label {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-label);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: var(--space-4);
}

.logistics-bar__value {
  font-size: var(--fs-body-md);
  font-weight: var(--fw-semibold);
}

.timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-16);
}

.timeline--milestones {
  align-items: start;
}

.timeline-item {
  display: flex;
  gap: var(--space-12);
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: var(--space-14) var(--space-16);
}

.timeline-item__dot {
  width: var(--space-12);
  height: var(--space-12);
  border-radius: var(--radius-pill);
  margin-top: var(--space-6);
  flex-shrink: 0;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.4);
}

.timeline-item__label {
  display: block;
  color: var(--text-dim);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}

.timeline-item__value {
  font-weight: var(--fw-semibold);
  font-size: var(--fs-body-sm);
  color: var(--text-white);
}

.value-point {
  border-left: 3px solid rgba(139, 92, 246, 0.4);
}

.enterprise-group__heading,
.enterprise-group__eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--fs-meta);
  color: var(--text-dim);
}

.section--industry .section__heading,
.section--industry .section-header {
  max-width: 20ch;
  margin-bottom: var(--space-20);
}

.section--industry .section-intro {
  margin: 0;
  padding: var(--space-16) var(--space-24);
  border-left-width: 2px;
  border-color: rgba(139, 92, 246, 0.24);
  background: rgba(139, 92, 246, 0.05);
  backdrop-filter: none;
}

.section--industry .section-intro__content {
  width: 100%;
  max-width: none;
  margin: 0;
  font-size: var(--fs-body-sm);
  line-height: 1.62;
  white-space: normal;
  text-align: justify;
  text-align-last: left;
}

.section--industry .enterprise-groups {
  margin-top: var(--space-24);
  align-items: stretch;
}

.section--industry .enterprise-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  height: 100%;
}

.section--industry .enterprise-group__value {
  max-width: 28ch;
  font-size: var(--fs-heading-md);
  font-weight: var(--fw-semibold);
  line-height: 1.32;
  color: var(--text-white);
}

.section--industry .enterprise-group__list {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-10);
  max-width: 46ch;
}

.section--industry .enterprise-group__list li {
  position: relative;
  padding-left: var(--space-16);
  color: var(--text-grey);
  font-size: var(--fs-body-sm);
  line-height: 1.6;
}

.section--industry .enterprise-group__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 4px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: rgba(194, 201, 218, 0.75);
}

.section--industry #participation-modes {
  margin-top: var(--space-32);
}

.section--industry .participation-options + .mt-section {
  margin-top: var(--space-36);
}

.proof-signal {
  background: var(--bg-elevated);
  border: 1px solid rgba(34, 211, 238, 0.22);
  border-radius: var(--radius-sm);
  padding: var(--space-16);
  box-shadow: inset 0 0 0 1px rgba(34, 211, 238, 0.05);
}

.proof-signal__value {
  display: block;
  margin-top: var(--space-4);
  font-size: var(--fs-heading-md);
  font-weight: var(--fw-semibold);
  color: var(--text-white);
  line-height: var(--lh-heading);
}

.section-inline-cta {
  margin-top: var(--space-24);
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
  align-items: flex-start;
  padding: var(--space-16) var(--space-18);
  border: 1px solid var(--border-glass);
  border-left: 3px solid rgba(34, 211, 238, 0.55);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(34, 211, 238, 0.05);
}

.registration-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-20);
  align-items: stretch;
}

.registration-layout + .action-cards {
  margin-top: var(--space-48);
}

.registration-copy,
.registration-form-surface {
  padding: var(--space-24);
  height: 100%;
}

.registration-copy {
  border-color: rgba(34, 211, 238, 0.22);
  background: rgba(34, 211, 238, 0.04);
}

.registration-form-surface {
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.registration-advanced {
  margin-bottom: var(--space-18);
}

.registration-form-surface::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: rgba(132, 150, 255, 0.6);
}

.registration-points {
  list-style: disc;
  padding-left: 1.2rem;
  display: grid;
  gap: var(--space-8);
}

.action-card {
  display: grid;
  gap: var(--space-8);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.action-card strong {
  color: var(--text-white);
}

.action-card:hover {
  transform: translateY(-1px);
  border-color: rgba(34, 211, 238, 0.32);
  background: rgba(34, 211, 238, 0.06);
}

.soft-cta {
  margin-top: var(--space-24);
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-10) var(--space-14);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.02);
  color: #dbe3f5;
}

.soft-cta a {
  color: var(--accent-cyan);
  text-decoration: underline;
  font-weight: var(--fw-semibold);
}

.partner-bar {
  margin: 0;
  padding: var(--space-32) 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
}

.partner-bar__heading {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: calc(var(--fs-meta) * 1.5);
  font-weight: var(--fw-semibold);
  color: var(--text-dim);
  margin-bottom: var(--space-20);
}

.partner-logos {
  max-width: var(--content-max-width);
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-12);
  width: min(var(--content-max-width), calc(100% - var(--space-40)));
}

.partner-logo-frame {
  aspect-ratio: 3 / 4;
  min-height: 180px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  position: relative;
}

.partner-logo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 52%;
  transform: scale(1.18);
  transform-origin: center;
  display: block;
}

.partner-logo--summit,
.partner-logo--nexus {
  transform: scale(1.3);
  object-position: center 54%;
}

.partner-logo--summit {
  transform: scale(1.08);
  object-position: center 56%;
}

.partner-logo--nexus {
  transform: scale(1.1);
  object-position: center 56%;
}

.partner-logo--nova,
.partner-logo--titan,
.partner-logo--vanguard {
  transform: scale(1.2);
  object-position: center 52%;
}

.faq-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-12);
}

.footer {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-glass);
}

.footer__inner {
  max-width: var(--content-max-width);
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-20);
  padding: var(--space-40) var(--space-20);
}

.footer__brand {
  color: var(--text-white);
  font-size: var(--fs-body-lg);
  font-weight: var(--fw-semibold);
}

.footer__tagline {
  margin-top: var(--space-8);
  white-space: normal;
  overflow-wrap: anywhere;
  font-size: clamp(0.72rem, 1.9vw, var(--fs-body-sm));
  line-height: 1.35;
}

.footer__social,
.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-16);
  font-size: var(--fs-ui-md);
}

.footer__social a,
.footer__links a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer__copy {
  grid-column: 1 / -1;
  border-top: 1px solid var(--border-glass);
  padding-top: var(--space-16);
  margin-top: var(--space-8);
  font-size: var(--fs-meta);
}

/* ─── Agent explainer (Section 4 compact block) ─── */
.agent-explainer {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  padding: var(--space-28);
  margin-bottom: var(--space-16);
}

.agent-explainer .subsection-heading {
  margin-bottom: var(--space-16);
}

.agent-explainer__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.agent-explainer__list li {
  padding-left: var(--space-20);
  position: relative;
  color: var(--text-grey);
  font-size: var(--fs-body-sm);
  line-height: var(--lh-body);
}

.agent-explainer__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--accent-cyan);
  box-shadow: 0 0 8px rgba(34, 211, 238, 0.45);
}

.agent-explainer__list li.agent-explainer__list-item--plain {
  padding-left: 0;
}

.agent-explainer__list li.agent-explainer__list-item--plain::before {
  content: none;
}