/* ========================================
   Site Header & Navigation
   ======================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 72rem;
  margin-inline: auto;
  padding: var(--space-md) var(--space-lg);
  gap: var(--space-md);
}

.site-logo {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--color-text-primary);
  text-decoration: none;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.site-logo:hover {
  color: var(--color-accent);
}

.nav-links {
  display: none;
  gap: var(--space-lg);
}

.nav-links a {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-text-primary);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.lang-toggle,
.contrast-toggle {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border: none;
  color: var(--color-text-secondary);
  background: transparent;
  transition: color var(--transition-fast);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lang-toggle:hover,
.contrast-toggle:hover {
  color: var(--color-text-primary);
}

/* Mobile menu toggle */
.nav-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-menu-toggle:hover {
  color: var(--color-text-primary);
}

.nav-menu-toggle .icon-bar {
  display: block;
  width: 24px;
  height: 1px;
  background-color: currentColor;
  margin: 4px 0;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }

  .nav-menu-toggle {
    display: none;
  }
}

.nav-links.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg);
  gap: var(--space-md);
}

/* ========================================
   Hero Section — Painting above, text below
   ======================================== */

.hero {
  position: relative;
}

.hero-artwork {
  width: 100%;
  max-height: 75vh;
  overflow: hidden;
}

.hero-img {
  width: 100%;
  height: 75vh;
  object-fit: cover;
  object-position: center top;
}

.hero-overlay {
  display: none;
}

.hero-content {
  max-width: 40rem;
  padding: 5rem var(--space-lg) var(--space-2xl);
}

.hero-title {
  color: var(--color-text-primary);
  font-size: var(--text-3xl);
  font-weight: 300;
  margin-block-end: var(--space-md);
}

.hero-subtitle {
  color: var(--color-accent);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 400;
}

/* ========================================
   Narrative Section
   ======================================== */

.narrative-artwork {
  padding: 8px;
  background-color: var(--color-bg);
  box-shadow: 0 0 0 1px var(--color-border);
}

.narrative-artwork img {
  border-radius: 0;
}

.artwork-credit {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-block-start: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.narrative-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.step-label {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-block-end: var(--space-sm);
}

.museum-label {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-md);
  background-color: var(--color-bg-alt);
  border: none;
  border-radius: 0;
}

.enriched-description {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-loose);
  padding-inline-start: 0;
  border-inline-start: none;
}

/* ========================================
   Accessibility Gap — Isolated Numbers
   ======================================== */

.gap-section {
  padding-block: var(--space-3xl);
}

.gap-numbers {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  margin-block-end: var(--space-xl);
}

.gap-stat-row {
  text-align: center;
}

.gap-stat {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1;
  letter-spacing: -0.02em;
}

.gap-stat--zero {
  font-size: clamp(3.5rem, 2.5rem + 5vw, 6rem);
  color: var(--color-accent);
}

.gap-stat-label {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-block-start: var(--space-xs);
}

.gap-source {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  text-align: center;
  opacity: 0.6;
}

/* ========================================
   Demo Toggle — underline tab switcher
   ======================================== */

.demo-section {
  text-align: center;
}

.demo-intro {
  max-width: 40rem;
  margin-inline: auto;
  margin-block-end: var(--space-lg);
  color: var(--color-text-secondary);
}

.toggle-control {
  display: inline-flex;
  gap: var(--space-lg);
  margin-block-end: var(--space-xl);
  position: relative;
}

.toggle-btn {
  font-family: var(--font-ui);
  font-size: var(--text-base);
  font-weight: 400;
  padding: var(--space-sm) 0;
  background-color: transparent;
  color: var(--color-text-secondary);
  opacity: 0.5;
  transition: opacity var(--transition-fast), color var(--transition-fast);
  min-height: 44px;
  position: relative;
}

.toggle-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.toggle-btn:hover {
  opacity: 0.75;
}

.toggle-btn--active {
  color: var(--color-text-primary);
  opacity: 1;
}

.toggle-btn--active::after {
  transform: scaleX(1);
}

.demo-card {
  max-width: 56rem;
  margin-inline: auto;
  text-align: start;
}

.demo-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.demo-card-image img {
  border-radius: 0;
  width: 100%;
}

.demo-card-content {
  padding-block-start: var(--space-md);
  position: relative;
}

.demo-before,
.demo-after {
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.demo-before.is-hidden,
.demo-after.is-hidden {
  opacity: 0;
  visibility: hidden;
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.demo-before .museum-label {
  margin-block-start: var(--space-sm);
}

.demo-after .enriched-description {
  margin-block-start: var(--space-sm);
}

.demo-artwork-credit {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-block-start: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@media (min-width: 768px) {
  .demo-card-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ========================================
   Value Cards (For Institutions)
   ======================================== */

.institutions-intro {
  max-width: 40rem;
  color: var(--color-text-secondary);
  margin-block-end: var(--space-xl);
}

.value-cards {
  margin-block-end: var(--space-xl);
  max-width: 40rem;
}

.value-card {
  padding-block: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.value-card:last-child {
  border-bottom: 1px solid var(--color-border);
}

.value-number {
  display: none;
}

.value-card h3 {
  font-size: var(--text-lg);
  font-weight: 500;
  margin-block-end: var(--space-sm);
}

.value-card p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

/* CTA Button */
.cta-button {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: var(--text-base);
  font-weight: 500;
  padding: var(--space-md) var(--space-xl);
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border-radius: 6px;
  text-decoration: none;
  transition: background-color var(--transition-fast);
  min-height: 44px;
}

.cta-button:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-text-inverse);
}

/* ========================================
   Team Section
   ======================================== */

.team-grid {
  max-width: 56rem;
  margin-inline: auto;
}

.team-member {
  text-align: center;
}

.team-photo {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 0;
  margin-inline: auto;
  margin-block-end: var(--space-md);
  background-color: var(--color-bg-alt);
  filter: grayscale(1);
  transition: filter var(--transition-normal);
}

.team-photo:hover {
  filter: grayscale(0);
}

.team-member h3 {
  font-size: var(--text-lg);
  font-weight: 400;
  margin-block-end: var(--space-xs);
}

.team-role {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
  margin-block-end: var(--space-sm);
}

.team-bio {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  max-width: 28rem;
  margin-inline: auto;
}

/* ========================================
   New Content Elements
   ======================================== */

.narrative-lede {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-block-end: var(--space-lg);
}

.prado-admission {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-style: italic;
  color: var(--color-text-secondary);
  margin-block-start: var(--space-sm);
  padding-inline-start: var(--space-md);
  border-inline-start: 2px solid var(--color-border);
}

.institutions-complement {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  max-width: 48rem;
  margin-block-end: var(--space-xl);
  line-height: var(--leading-normal);
}

/* ========================================
   Contact Section
   ======================================== */

.contact {
  text-align: center;
  padding-block: var(--space-3xl);
}

.contact p {
  max-width: 32rem;
  margin-inline: auto;
  color: var(--color-text-secondary);
  margin-block-end: var(--space-lg);
}

.contact-lead {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 300;
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  max-width: 40rem;
  margin-inline: auto;
  margin-block-end: var(--space-lg);
}

.contact .cta-button {
  background: transparent;
  color: var(--color-accent);
  padding: 0;
  border-radius: 0;
  position: relative;
}

.contact .cta-button::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: transform var(--transition-normal);
  transform-origin: left;
}

.contact .cta-button:hover {
  background: transparent;
  color: var(--color-accent-hover);
}

.contact .cta-button:hover::after {
  background-color: var(--color-accent-hover);
}

/* ========================================
   Footer — white, minimal
   ======================================== */

.site-footer {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  padding-block: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.site-footer h3 {
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  margin-block-end: var(--space-sm);
}

.site-footer p {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.footer-accessibility {
  border-inline-start: none;
  padding-inline-start: 0;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}