/* Navigation, buttons, cards, panels, language control */

/* ---- Site header ---- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-med) var(--ease-soft),
    border-color var(--dur-med) var(--ease-soft),
    backdrop-filter var(--dur-med) var(--ease-soft);
  border-bottom: 1px solid transparent;
  color: var(--color-cream-soft);
}

.site-header.is-scrolled,
.site-header.is-solid {
  background: rgba(10, 9, 8, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(232, 223, 208, 0.08);
}

.site-header__inner {
  width: min(100% - (var(--gutter) * 2), var(--wide-max));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: inherit;
}

.brand:hover {
  color: inherit;
  opacity: 0.85;
}

.brand__mark {
  color: var(--color-amber);
  font-style: italic;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 0.15rem 1.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-desktop a {
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: inherit;
  opacity: 0.78;
  padding: 0.35rem 0;
  position: relative;
}

.nav-desktop a:hover,
.nav-desktop a[aria-current="true"] {
  opacity: 1;
  color: var(--color-amber);
}

.nav-desktop a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--color-amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}

.nav-desktop a:hover::after,
.nav-desktop a[aria-current="true"]::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid rgba(232, 223, 208, 0.22);
  border-radius: 999px;
  overflow: hidden;
}

.lang-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0.35rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  opacity: 0.55;
  transition: background var(--dur-fast) var(--ease-soft),
    opacity var(--dur-fast) var(--ease-soft);
}

.lang-switch button[aria-pressed="true"] {
  background: rgba(196, 165, 116, 0.18);
  opacity: 1;
  color: var(--color-amber);
}

.menu-toggle {
  appearance: none;
  border: 1px solid rgba(232, 223, 208, 0.28);
  background: transparent;
  color: inherit;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 999px;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  position: relative;
}

.menu-toggle__bars,
.menu-toggle__bars::before,
.menu-toggle__bars::after {
  display: block;
  width: 1rem;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur-med) var(--ease-out),
    opacity var(--dur-fast) var(--ease-soft);
}

.menu-toggle__bars::before,
.menu-toggle__bars::after {
  content: "";
  position: absolute;
}

.menu-toggle__bars::before {
  transform: translateY(-5px);
}

.menu-toggle__bars::after {
  transform: translateY(5px);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bars {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bars::before {
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bars::after {
  transform: rotate(-45deg);
}

/* Mobile panel */
.nav-panel {
  position: fixed;
  inset: var(--nav-h) 0 0 0;
  background: rgba(10, 9, 8, 0.97);
  color: var(--color-cream-soft);
  transform: translateY(-0.5rem);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-med) var(--ease-soft),
    transform var(--dur-med) var(--ease-out),
    visibility var(--dur-med);
  z-index: 99;
  overflow: auto;
  padding: var(--space-6) var(--gutter) var(--space-8);
}

.nav-panel.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
}

.nav-panel nav {
  display: grid;
  gap: 0.25rem;
  max-width: 28rem;
}

.nav-panel a {
  text-decoration: none;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1.15;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(232, 223, 208, 0.08);
  color: inherit;
}

.nav-panel a:hover {
  color: var(--color-amber);
}

.nav-panel__sub {
  margin-top: var(--space-6);
  display: grid;
  gap: 0.5rem;
}

.nav-panel__sub a {
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  border: 0;
  padding: 0.35rem 0;
  opacity: 0.75;
}

body.nav-open {
  overflow: hidden;
}

@media (min-width: 960px) {
  .nav-desktop {
    display: flex;
  }

  .menu-toggle {
    display: none;
  }

  .nav-panel {
    display: none;
  }
}

/* ---- Buttons / links ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1.35rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  transition: background var(--dur-fast) var(--ease-soft),
    color var(--dur-fast) var(--ease-soft),
    border-color var(--dur-fast) var(--ease-soft),
    transform var(--dur-fast) var(--ease-soft);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--light {
  color: var(--color-cream-soft);
  border-color: rgba(232, 223, 208, 0.4);
}

.btn--light:hover {
  background: var(--color-cream-soft);
  color: var(--color-void);
  border-color: var(--color-cream-soft);
}

.btn--dark {
  color: var(--color-ink);
  border-color: rgba(26, 20, 16, 0.3);
}

.btn--dark:hover {
  background: var(--color-ink);
  color: var(--color-ivory);
  border-color: var(--color-ink);
}

.btn--ghost {
  border-color: transparent;
  padding-inline: 0;
}

.btn--ghost:hover {
  color: var(--accent);
  transform: none;
  background: transparent;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--accent);
}

.text-link::after {
  content: "→";
  transition: transform var(--dur-fast) var(--ease-out);
}

.text-link:hover::after {
  transform: translateX(3px);
}

/* ---- Cards / panels ---- */
.discipline-grid {
  display: grid;
  gap: 1px;
  background: var(--color-rule);
  border: 1px solid var(--color-rule);
}

@media (min-width: 720px) {
  .discipline-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.discipline-card {
  background: var(--bg);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  display: grid;
  gap: 1rem;
  min-height: 14rem;
  transition: background var(--dur-med) var(--ease-soft);
}

.section--dark .discipline-card {
  background: var(--color-charcoal);
}

.discipline-card:hover {
  background: var(--bg-elevated);
}

.section--dark .discipline-card:hover {
  background: #1a1613;
}

.discipline-card__index {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  color: var(--accent);
}

.discipline-card h3 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3vw, 2.5rem);
  letter-spacing: -0.02em;
}

.discipline-card p {
  color: var(--fg-muted);
  max-width: 36ch;
}

.course-grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 800px) {
  .course-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.course-card {
  border-top: 1px solid var(--color-rule);
  padding-top: var(--space-5);
  display: grid;
  gap: 0.85rem;
  align-content: start;
}

.course-card__code {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--accent);
}

.course-card h3 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
}

.course-card p {
  color: var(--fg-muted);
  font-size: var(--fs-sm);
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-top: 0.25rem;
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--color-rule);
  border-radius: 999px;
  color: var(--fg-muted);
}

.research-grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 900px) {
  .research-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.research-card {
  border: 1px solid var(--color-rule);
  padding: clamp(1.25rem, 2.5vw, 1.85rem);
  display: grid;
  gap: 1rem;
  min-height: 100%;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color var(--dur-med) var(--ease-soft),
    transform var(--dur-med) var(--ease-out);
}

.research-card:hover {
  border-color: var(--color-amber-dim);
  transform: translateY(-3px);
}

.research-card__focus {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--accent);
}

.research-card h3 {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 2vw, 1.85rem);
  line-height: 1.15;
}

.research-card p {
  color: var(--fg-muted);
  font-size: var(--fs-sm);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}

.tag {
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  background: rgba(196, 165, 116, 0.12);
  color: var(--fg-muted);
}

/* Stats / fact strip */
.fact-strip {
  display: grid;
  gap: 1px;
  background: var(--color-rule);
  border: 1px solid var(--color-rule);
}

@media (min-width: 720px) {
  .fact-strip {
    grid-template-columns: repeat(4, 1fr);
  }
}

.fact {
  background: var(--bg);
  padding: 1.25rem 1.15rem;
  display: grid;
  gap: 0.45rem;
}

.section--dark .fact {
  background: var(--color-charcoal);
}

.fact dt {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--accent);
}

.fact dd {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  line-height: 1.45;
}

/* Quote */
.pull-quote {
  margin: 0;
  max-width: 34rem;
}

.pull-quote p {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3vw, 2.4rem);
  line-height: 1.25;
  font-style: italic;
  letter-spacing: -0.015em;
}

.pull-quote footer {
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--fg-muted);
}

/* Gallery */
.gallery-grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 760px) {
  .gallery-grid {
    grid-template-columns: 1.15fr 0.85fr;
    grid-template-rows: auto auto;
  }

  .gallery-item:first-child {
    grid-row: span 2;
  }
}

.gallery-item {
  position: relative;
  overflow: hidden;
  background: var(--color-smoke);
  border-radius: var(--radius-sm);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 4;
  transition: transform var(--dur-slow) var(--ease-out);
}

.gallery-item:first-child img {
  aspect-ratio: 3 / 4;
  min-height: 100%;
}

@media (min-width: 760px) {
  .gallery-item:not(:first-child) img {
    aspect-ratio: 4 / 3;
  }
}

.gallery-item:hover img {
  transform: scale(1.03);
}

.gallery-item figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1rem 1.1rem;
  background: linear-gradient(transparent, rgba(10, 9, 8, 0.78));
  color: var(--color-cream-soft);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
}

/* Contact */
.contact-grid {
  display: grid;
  gap: var(--space-7);
}

@media (min-width: 800px) {
  .contact-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: end;
  }
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.contact-list li {
  display: grid;
  gap: 0.35rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-rule);
}

.contact-list a {
  text-decoration: none;
  font-family: var(--font-serif);
  font-size: var(--fs-md);
}

.placeholder-note {
  font-size: var(--fs-xs);
  color: var(--fg-muted);
  font-style: italic;
}

/* Footer */
.site-footer {
  padding: var(--space-7) 0 var(--space-6);
  background: var(--color-void);
  color: var(--color-fog);
  border-top: 1px solid rgba(232, 223, 208, 0.08);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 720px) {
  .site-footer__inner {
    grid-template-columns: 1.4fr 1fr;
    align-items: end;
  }
}

.site-footer .brand {
  color: var(--color-cream-soft);
  font-size: 1.75rem;
}

.site-footer p {
  max-width: 36ch;
  font-size: var(--fs-sm);
  color: var(--color-fog);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
}

.footer-meta a {
  text-decoration: none;
  opacity: 0.8;
}

.footer-meta a:hover {
  opacity: 1;
  color: var(--color-amber);
}