/* ==========================================================================
   Homepage sections
   00 Opening · 01 Perspective · 02 Fieldwork · 03 Toolkit · 04 Questions · 05 Connect
   ========================================================================== */

/* ==========================================================================
   00 — Opening
   ========================================================================== */
.opening {
  position: relative;
  display: grid;
  min-height: 100svh;
  grid-template-columns: minmax(0, 1.05fr) minmax(17rem, 0.72fr);
  align-items: center;
  gap: clamp(2.5rem, 7vw, 8rem);
  padding: clamp(6rem, 12vh, 8rem) var(--gutter) clamp(5rem, 9vh, 7rem);
  background: var(--paper);
  isolation: isolate;
}

.opening__grain {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(var(--ink) 0.5px, transparent 0.55px);
  background-size: 7px 7px;
  opacity: 0.45;
  mask-image: linear-gradient(110deg, black, transparent 62%);
}

.opening__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.opening__meta li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.opening__meta li + li::before {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--coral);
  content: '';
}

.opening__title {
  max-width: 10em;
  font-size: var(--display-xl);
  font-weight: 700;
  letter-spacing: -0.085em;
  line-height: 0.74;
}

.opening__title > span {
  display: block;
}

.opening__title-accent {
  padding-left: 0.4em;
  color: var(--coral-display);
  font-family: var(--font-serif);
  font-size: 0.83em;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.1em;
}

.opening__statement {
  max-width: var(--measure);
  margin: clamp(2rem, 5vw, 3.5rem) 0 0;
  color: var(--muted);
  font-size: var(--text-lg);
  text-wrap: pretty;
}

.opening__statement em {
  color: var(--ink);
  font-family: var(--font-serif);
}

.opening__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

/* --- The two poles the visitor can interrogate ----------------------------- */
.opening__relationship {
  position: relative;
  display: grid;
  min-height: 26rem;
  align-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) 0 2.75rem;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.identity-pole {
  display: flex;
  width: fit-content;
  flex-direction: column;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--ink);
  text-align: left;
  transition: padding var(--dur), color var(--dur);
}

.identity-pole span {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2vw, 2rem);
  font-style: italic;
}

.identity-pole strong {
  font-size: clamp(2.1rem, 3.8vw, 4.2rem);
  letter-spacing: -0.075em;
  line-height: 0.82;
}

.identity-pole:hover,
.identity-pole.is-selected {
  padding-left: 0.7rem;
  color: var(--blue-ink);
}

.identity-pole:last-of-type {
  align-self: end;
  color: var(--coral-ink);
  text-align: right;
}

.identity-pole:last-of-type:hover,
.identity-pole:last-of-type.is-selected {
  color: var(--blue-ink);
}

.opening__connector {
  display: grid;
  width: 3rem;
  height: 2.2rem;
  place-items: center;
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-style: italic;
  line-height: 1;
}

.opening__response {
  max-width: 20rem;
  min-height: 4.5rem;
  margin: var(--space-md) 0 0;
  color: var(--muted);
  font-size: var(--text-md);
}

.opening__relationship::after {
  position: absolute;
  right: 0;
  bottom: 0.75rem;
  color: var(--coral-ink);
  content: 'Psychology × Computer science';
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.scroll-prompt {
  position: absolute;
  bottom: 1.1rem;
  left: var(--gutter);
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 2.75rem;
  color: var(--ink);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-label);
  text-decoration: none;
  text-transform: uppercase;
}

.scroll-prompt__line {
  width: 2.8rem;
  height: 1px;
  background: var(--ink);
  transition: width var(--dur);
}

.scroll-prompt:hover .scroll-prompt__line {
  width: 4rem;
}

/* ==========================================================================
   01 — Perspective + the Venn
   ========================================================================== */
.perspective {
  background: var(--mist);
}

.perspective__intro {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.65fr);
  align-items: end;
  gap: clamp(2rem, 7vw, 9rem);
}

.perspective h2,
.explore h2 {
  font-size: var(--display-md);
  font-weight: 700;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-display);
}

.perspective h2 em,
.explore h2 em {
  color: var(--blue-ink);
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

.perspective__copy {
  max-width: 30rem;
  color: var(--muted);
  font-size: var(--text-lg);
  text-wrap: pretty;
}

.venn {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 20rem);
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: clamp(3rem, 7vw, 6rem);
}

/* The stage is a container so every label scales with the diagram itself
   rather than with the viewport — the diagram stays proportional at any size. */
.venn__stage {
  position: relative;
  width: min(100%, 42rem);
  aspect-ratio: 20 / 19;
  margin-inline: auto;
  container-type: inline-size;
}

/* Everything below is expressed in `cqw` — 1% of the stage's width. Percentage
   padding on an absolutely positioned box resolves against its containing
   block, not against itself, which silently distorts the circles; container
   units resolve predictably and keep the whole diagram proportional.
   Circle geometry (in cqw, origin at the stage's top-left):
     psychology  centre (31, 31)  r 31
     computing   centre (69, 31)  r 31
     interaction centre (50, 64)  r 31
   Stage height is 95cqw, so the three centres sit inside the frame. */
.venn__key {
  position: absolute;
  display: flex;
  width: 62cqw;
  height: 62cqw;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--surface, rgba(247, 241, 230, 0.6));
  color: var(--ink);
  text-align: left;
  /* Multiply is what makes the overlaps read as genuine intersections
     instead of one circle simply covering another. */
  mix-blend-mode: multiply;
  transition:
    transform var(--dur) var(--ease-out),
    box-shadow var(--dur),
    background var(--dur);
}

.venn__key-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 5cqw;
  font-style: italic;
  line-height: 0.98;
}

.venn__key-note {
  display: block;
  margin-top: 0.75em;
  font-family: var(--font-mono);
  font-size: 1.9cqw;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Each label is padded into the crescent its circle does not share with any
   other, so no label is ever printed on top of an overlap. */
.venn__key--psychology {
  top: 0;
  left: 0;
  padding: 16cqw 30cqw 24cqw 6cqw;
  --surface: rgba(241, 119, 93, 0.42);
}

.venn__key--computing {
  top: 0;
  left: 38cqw;
  align-items: flex-end;
  padding: 16cqw 6cqw 24cqw 30cqw;
  --surface: rgba(89, 113, 255, 0.34);
  text-align: right;
}

.venn__key--interaction {
  top: 33cqw;
  left: 19cqw;
  align-items: center;
  padding: 37cqw 13cqw 8cqw;
  --surface: rgba(216, 255, 89, 0.62);
  text-align: center;
}

/* Blend modes swallow outlines and shadows, so the active circle drops back
   to normal compositing and carries a solid ring instead. */
.venn__key:hover,
.venn__key:focus-visible,
.venn__key.is-selected {
  z-index: 4;
  box-shadow: 0 0 0 0.35rem var(--ink);
  mix-blend-mode: normal;
}

.venn__core {
  position: absolute;
  top: 42cqw;
  left: 50cqw;
  z-index: 3;
  display: grid;
  width: 15cqw;
  height: 15cqw;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-serif);
  font-size: 2.1cqw;
  font-style: italic;
  line-height: 1.2;
  text-align: center;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.venn__glyph {
  display: none;
}

.venn__readout {
  align-self: center;
  border-left: 2px solid var(--coral);
  padding-left: var(--space-md);
  color: var(--muted);
  font-size: var(--text-md);
}

.venn__readout strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

/* ==========================================================================
   02 — Fieldwork
   ========================================================================== */
.work {
  background: var(--ink);
  color: var(--on-ink);
}

.work__heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 18rem);
  align-items: end;
  gap: var(--space-lg);
  margin-bottom: clamp(3rem, 7vw, 7rem);
}

.work__heading .section-number {
  grid-column: 1 / -1;
}

.work h2 {
  color: var(--paper);
  font-size: var(--display-lg);
  font-weight: 700;
  letter-spacing: -0.085em;
  line-height: 0.74;
}

.work h2 em {
  color: var(--coral);
  font-family: var(--font-serif);
  font-size: 0.89em;
  font-style: italic;
  font-weight: 400;
}

.work__heading > p:last-child {
  margin-bottom: 0.2rem;
  color: var(--on-ink);
  font-size: var(--text-md);
}

.case-study {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2rem, 5vw, 5rem);
  border-top: 1px solid var(--rule-light);
  padding: clamp(3rem, 6vw, 6rem) 0;
}

.case-study__index {
  position: absolute;
  top: 1.1rem;
  right: 0;
  color: var(--acid);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
}

.case-study h3 {
  color: var(--paper);
  font-size: var(--display-md);
  font-weight: 700;
  letter-spacing: -0.09em;
  line-height: 0.76;
}

.case-study h3 em {
  color: var(--coral);
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

.case-study__summary {
  max-width: 26rem;
  margin: var(--space-lg) 0 0;
  color: var(--on-ink);
  font-size: var(--text-base);
  text-wrap: pretty;
}

.case-study__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: var(--space-md);
}

.case-study__tags li {
  border: 1px solid var(--rule-light-strong);
  padding: 0.32rem 0.6rem;
  color: rgba(247, 241, 230, 0.78);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.case-study__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-md);
  margin-top: var(--space-2xs);
}

.case-study__link {
  margin-top: var(--space-md);
  border-bottom-color: var(--acid);
  color: var(--acid);
}

.case-study__links .case-study__link {
  margin-top: var(--space-2xs);
}

.case-study__link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.case-study__details {
  align-self: end;
  grid-column: 1;
}

.case-study__details div {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: var(--space-sm);
  border-top: 1px solid var(--rule-light);
  padding: 0.85rem 0;
}

.case-study__details dt {
  color: var(--acid);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.case-study__details dd {
  color: var(--on-ink);
  font-size: var(--text-md);
}

.case-study__media {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: start;
}

/* --- Media frame: a click-to-play window ---------------------------------
   The source videos are large, so nothing is fetched until the visitor asks
   for it. The poster panel is a designed state, not a loading gap. */
.media-frame {
  width: 100%;
  max-width: 34rem;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--rule-light-strong);
  background: var(--ink-sunken);
}

.media-frame--tall {
  max-width: 19rem;
  margin-inline: auto;
}

.media-frame__bar {
  display: flex;
  align-items: center;
  gap: 0.33rem;
  min-height: 2rem;
  border-bottom: 1px solid var(--rule-light);
  padding: 0 0.6rem;
}

.media-frame__bar i {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--coral);
}

.media-frame__bar i:nth-child(2) { background: var(--acid); }
.media-frame__bar i:nth-child(3) { background: var(--blue); }

.media-frame__bar p {
  margin-left: 0.5rem;
  color: rgba(247, 241, 230, 0.55);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
}

.media-frame__stage {
  position: relative;
  display: grid;
  aspect-ratio: var(--media-ratio, 16 / 10);
  background:
    repeating-linear-gradient(
      -45deg,
      rgba(247, 241, 230, 0.035) 0 1px,
      transparent 1px 9px
    ),
    var(--ink-sunken);
}

.media-frame__stage > * {
  grid-area: 1 / 1;
}

.media-frame__poster {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}

.media-frame--tall .media-frame__poster {
  object-fit: contain;
}

.media-frame__play {
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  border: 0;
  padding: var(--space-md);
  background: transparent;
  color: var(--paper);
  --focus-ring: var(--acid);
}

.media-frame__play-mark {
  display: grid;
  width: 3.5rem;
  height: 3.5rem;
  place-items: center;
  border: 1px solid var(--acid);
  border-radius: 50%;
  background: rgba(21, 23, 42, 0.6);
  color: var(--acid);
  font-size: 1rem;
  line-height: 1;
  transition: background var(--dur-fast), color var(--dur-fast), transform var(--dur-fast);
}

.media-frame__play-mark::before {
  content: '';
  border-top: 0.5rem solid transparent;
  border-bottom: 0.5rem solid transparent;
  border-left: 0.85rem solid currentColor;
  margin-left: 0.2rem;
}

.media-frame__play:hover .media-frame__play-mark {
  background: var(--acid);
  color: var(--ink);
  transform: scale(1.06);
}

.media-frame__play-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.media-frame__play-hint {
  color: rgba(247, 241, 230, 0.6);
  font-size: var(--text-2xs);
  letter-spacing: 0.04em;
}

.media-frame__video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--ink-sunken);
}

.media-frame__fallback {
  z-index: 3;
  display: grid;
  align-content: center;
  gap: 0.5rem;
  padding: var(--space-md);
  background: var(--ink-sunken);
  color: var(--on-ink);
  font-size: var(--text-md);
  text-align: center;
}

.media-frame__fallback code {
  color: var(--acid);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.media-frame.is-playing .media-frame__poster,
.media-frame.is-playing .media-frame__play {
  display: none;
}

/* --- The museum invitation, presented as a case file with its own door ----- */
.case-study--museum {
  border-bottom: 1px solid var(--rule-light);
}

.museum-door {
  position: relative;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: var(--space-xs);
  min-height: 20rem;
  overflow: hidden;
  border: 1px solid var(--brass);
  padding: var(--space-xl) var(--space-md);
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(216, 178, 94, 0.22), transparent 62%),
    var(--ink-sunken);
  color: var(--paper);
  text-align: center;
  text-decoration: none;
  transition: background var(--dur), transform var(--dur) var(--ease-out);
}

.museum-door::after {
  position: absolute;
  inset: 0.55rem;
  border: 1px solid rgba(216, 178, 94, 0.35);
  content: '';
  pointer-events: none;
}

.museum-door:hover {
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(216, 178, 94, 0.34), transparent 66%),
    var(--ink-sunken);
}

.museum-door__eyebrow {
  color: var(--brass);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.museum-door__title {
  max-width: 12ch;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  font-style: italic;
  line-height: 1;
}

.museum-door__enter {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: var(--space-2xs);
  border-bottom: 1px solid var(--brass);
  padding-bottom: 0.25rem;
  color: var(--brass);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ==========================================================================
   03 — Toolkit
   ========================================================================== */
.methods {
  background: var(--paper);
}

.methods__intro {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.5fr);
  align-items: end;
  gap: var(--space-xl);
  margin-bottom: clamp(3rem, 7vw, 6rem);
}

.methods h2 {
  font-size: var(--display-md);
  font-weight: 700;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-display);
}

.methods h2 em {
  color: var(--blue-ink);
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

.methods__intro > p {
  max-width: 18rem;
  color: var(--muted);
  font-size: var(--text-base);
}

.method-ledger {
  border-top: 2px solid var(--ink);
}

.method-ledger__row {
  display: grid;
  grid-template-columns: 4rem minmax(10rem, 0.8fr) minmax(0, 1.2fr);
  align-items: center;
  gap: var(--space-md);
  min-height: 7.5rem;
  border-bottom: 1px solid var(--rule);
  padding-inline: 0;
  transition: background var(--dur), padding var(--dur);
}

.method-ledger__row:hover {
  padding-inline: var(--space-sm);
  background: var(--acid);
}

.method-ledger__row > span {
  color: var(--blue-ink);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-style: italic;
}

.method-ledger h3 {
  font-size: clamp(1.35rem, 2.4vw, 2.4rem);
  font-weight: 400;
  letter-spacing: -0.05em;
  line-height: 1.05;
}

.method-ledger ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
}

.method-ledger li {
  color: var(--muted);
  font-size: var(--text-md);
}

.method-ledger li:not(:last-child)::after {
  padding-left: 0.5rem;
  color: var(--rule-strong);
  content: '·';
}

.method-ledger__row:hover li,
.method-ledger__row:hover li::after {
  color: var(--ink);
}

/* The ticker gets its own overflow context so it never widens the page. */
.methods__marquee {
  margin-top: clamp(3.5rem, 8vw, 7rem);
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, black 6%, black 94%, transparent);
}

.methods__ticker {
  display: flex;
  width: max-content;
  gap: 1.7rem;
  color: var(--coral);
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 4.5rem);
  font-style: italic;
  letter-spacing: -0.06em;
  white-space: nowrap;
  animation: ticker 34s linear infinite;
}

.methods__ticker li::after {
  padding-left: 1.7rem;
  color: var(--blue);
  content: '×';
}

/* Two identical runs make the loop seamless; the second is decorative. */
@keyframes ticker {
  to {
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .methods__ticker {
    animation: none;
  }
  .methods__marquee {
    overflow-x: auto;
  }
}

/* ==========================================================================
   04 — Questions
   ========================================================================== */
.explore {
  background: var(--coral);
  color: var(--on-coral);
}

.explore__heading {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.6fr);
  align-items: end;
  gap: clamp(2rem, 7vw, 9rem);
}

.explore h2 {
  color: var(--ink);
}

.explore h2 em {
  color: var(--ink);
  opacity: 0.62;
}

.explore .section-number {
  color: var(--ink);
}

.explore__heading > p {
  max-width: 21rem;
  color: var(--on-coral);
  font-size: var(--text-base);
}

.question-list {
  margin-top: clamp(3rem, 7vw, 6rem);
  border-top: 1px solid var(--ink);
}

.question-list__item {
  border-bottom: 1px solid rgba(21, 23, 42, 0.35);
  transition: background var(--dur), padding var(--dur);
}

.question-list__trigger {
  display: grid;
  width: 100%;
  grid-template-columns: 3.25rem minmax(0, 1fr) 1.75rem;
  align-items: center;
  gap: var(--space-sm);
  border: 0;
  padding: 1.35rem 0;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.question-list__trigger > span:first-child {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-style: italic;
}

.question-list__trigger strong {
  font-size: clamp(1.1rem, 1.9vw, 1.85rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.15;
  text-wrap: pretty;
}

.question-list__sign {
  position: relative;
  width: 1rem;
  height: 1rem;
  justify-self: end;
}

.question-list__sign::before,
.question-list__sign::after {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  content: '';
  transition: transform var(--dur) var(--ease-out);
}

.question-list__sign::after {
  transform: rotate(90deg);
}

.question-list__item.is-open .question-list__sign::after {
  transform: rotate(0deg);
}

.question-list__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur) var(--ease-out);
}

.question-list__item.is-open .question-list__panel {
  grid-template-rows: 1fr;
}

/* The height animation is presentational only. A collapsed answer is taken out
   of the tab order and the accessibility tree with `inert`, set by script —
   that is instant and does not depend on a transition finishing. */
.question-list__panel > div {
  overflow: hidden;
}

.question-list__panel p {
  max-width: 42rem;
  padding: 0 0 1.5rem 3.25rem;
  color: var(--on-coral);
  font-size: var(--text-md);
}

.question-list__item:hover,
.question-list__item.is-open {
  padding-inline: var(--space-sm);
  background: var(--paper);
}

.question-list__item:hover .question-list__panel p,
.question-list__item.is-open .question-list__panel p {
  color: var(--muted);
}

/* ==========================================================================
   05 — Connect
   ========================================================================== */
.contact {
  background: var(--blue-deep);
  color: var(--on-blue);
  --focus-ring: var(--acid);
}

.contact__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  align-items: start;
  gap: clamp(2.5rem, 8vw, 8rem);
}

.contact h2 {
  color: var(--paper);
  font-size: var(--display-md);
  font-weight: 700;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-display);
}

.contact h2 em {
  color: var(--acid);
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

.contact__invitation {
  max-width: 24rem;
  margin: var(--space-lg) 0 0;
  color: var(--on-blue);
  font-size: var(--text-base);
  text-wrap: pretty;
}

.contact__direct-links {
  display: grid;
  gap: 0.2rem;
  margin-top: var(--space-xl);
  max-width: 22rem;
}

.contact__direct-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 2.9rem;
  border-bottom: 1px solid rgba(247, 241, 230, 0.4);
  color: var(--paper);
  font-size: var(--text-md);
  text-decoration: none;
  transition: color var(--dur-fast), padding var(--dur-fast);
}

.contact__direct-links a:hover {
  padding-left: 0.4rem;
  color: var(--acid);
}

/* --- Form ------------------------------------------------------------------ */
.contact__form {
  display: grid;
  gap: 0.4rem;
  border: 1px solid rgba(247, 241, 230, 0.55);
  padding: clamp(1.1rem, 3vw, 1.75rem);
  background: rgba(13, 15, 28, 0.22);
}

.contact__form label {
  margin-top: var(--space-xs);
  color: var(--acid);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.contact__form input:not([type='submit']),
.contact__form textarea {
  width: 100%;
  min-height: 2.75rem;
  border: 0;
  border-bottom: 1px solid rgba(247, 241, 230, 0.65);
  border-radius: 0;
  padding: 0.55rem 0;
  background: transparent;
  color: var(--paper);
  outline-offset: 2px;
  resize: vertical;
  transition: border-color var(--dur-fast);
}

.contact__form input::placeholder,
.contact__form textarea::placeholder {
  color: rgba(247, 241, 230, 0.42);
}

.contact__form input:hover,
.contact__form textarea:hover {
  border-bottom-color: var(--paper);
}

.contact__form [aria-invalid='true'] {
  border-bottom-color: var(--coral);
}

.contact__error {
  min-height: 1.1rem;
  color: var(--error-light);
  font-size: var(--text-xs);
}

/* Honeypot — hidden from people, reachable by naive bots. */
.contact__trap {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.contact__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 3rem;
  margin-top: var(--space-md);
  border: 1px solid var(--acid);
  border-radius: 0;
  padding: 0.75rem 1rem;
  background: var(--acid);
  color: var(--ink);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background var(--dur-fast), color var(--dur-fast);
}

.contact__submit:hover:not(:disabled) {
  background: transparent;
  color: var(--acid);
}

.contact__submit:disabled {
  cursor: progress;
  opacity: 0.72;
}

.contact__spinner {
  width: 0.85rem;
  height: 0.85rem;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-right-color: transparent;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.contact__status {
  margin-top: var(--space-xs);
  border-left: 2px solid var(--acid);
  padding: 0.6rem 0.75rem;
  background: rgba(13, 15, 28, 0.4);
  color: var(--paper);
  font-size: var(--text-md);
}

.contact__status[data-tone='error'] {
  border-left-color: var(--coral);
}

.contact__status a {
  color: var(--acid);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

/* --- Tablet ---------------------------------------------------------------- */
@media (max-width: 60rem) {
  .opening {
    display: block;
    padding-top: clamp(5rem, 14vh, 7rem);
    padding-bottom: 5.5rem;
  }

  .opening__relationship {
    min-height: 0;
    margin-top: var(--space-2xl);
    padding: var(--space-md) 0 2.5rem;
  }

  .identity-pole strong {
    font-size: clamp(2.4rem, 9vw, 4rem);
  }

  .opening__relationship::after {
    right: auto;
    left: 0;
    bottom: 0.6rem;
  }

  .perspective__intro,
  .explore__heading,
  .methods__intro,
  .work__heading,
  .contact__layout {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
  }

  .work__heading > p:last-child {
    max-width: 28rem;
  }

  .case-study,
  .case-study--museum {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
  }

  .case-study__details,
  .case-study__media {
    grid-column: 1;
    grid-row: auto;
  }

  .media-frame,
  .media-frame--tall {
    max-width: 100%;
    margin-inline: 0;
  }

  .method-ledger__row {
    grid-template-columns: 2.25rem minmax(0, 1fr);
    gap: 0.35rem var(--space-sm);
    min-height: 0;
    padding-block: 1.35rem;
  }

  .method-ledger__row ul {
    grid-column: 2;
  }
}

/* --- The Venn switches to a dedicated small-screen layout ------------------
   Below this width the circles can no longer hold their own labels legibly,
   so the diagram becomes a compact glyph and the labels become a real list.
   The idea — three fields, one overlap — survives intact. */
@media (max-width: 56rem) {
  .venn {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
  }

  .venn__stage {
    display: grid;
    width: 100%;
    aspect-ratio: auto;
    gap: 0.4rem;
    container-type: normal;
  }

  .venn__core {
    display: none;
  }

  .venn__glyph {
    position: relative;
    display: block;
    width: 9.5rem;
    aspect-ratio: 20 / 19;
    margin: 0 auto var(--space-md);
  }

  .venn__glyph span {
    position: absolute;
    width: 62%;
    aspect-ratio: 1;
    border: 1px solid var(--ink);
    border-radius: 50%;
    background: var(--lobe);
    mix-blend-mode: multiply;
    opacity: 0.4;
    transition: opacity var(--dur), transform var(--dur) var(--ease-out);
  }

  .venn__glyph span:nth-child(1) { top: 0; left: 0; --lobe: rgba(241, 119, 93, 0.9); }
  .venn__glyph span:nth-child(2) { top: 0; left: 38%; --lobe: rgba(89, 113, 255, 0.8); }
  .venn__glyph span:nth-child(3) { top: 34.7%; left: 19%; --lobe: rgba(216, 255, 89, 0.95); }

  .venn[data-venn-active='psychology'] .venn__glyph span:nth-child(1),
  .venn[data-venn-active='computing'] .venn__glyph span:nth-child(2),
  .venn[data-venn-active='interaction'] .venn__glyph span:nth-child(3) {
    opacity: 1;
    transform: scale(1.04);
  }

  .venn__glyph-core {
    position: absolute;
    top: 44%;
    left: 50%;
    width: 18%;
    aspect-ratio: 1;
    border-radius: 50%;
    background: var(--ink);
    transform: translate(-50%, -50%);
  }

  /* Circles become rows: full-width, comfortably tappable, legible type. */
  .venn__key {
    position: static;
    display: grid;
    width: 100%;
    height: auto;
    overflow: visible;
    grid-template-columns: 0.9rem minmax(0, 1fr);
    align-items: center;
    gap: 0 var(--space-sm);
    min-height: 3.5rem;
    border: 1px solid var(--rule);
    border-radius: 0;
    padding: var(--space-sm) var(--space-md) var(--space-sm) var(--space-sm);
    background: rgba(247, 241, 230, 0.55);
    mix-blend-mode: normal;
    text-align: left;
  }

  .venn__key::before {
    width: 0.9rem;
    height: 0.9rem;
    grid-row: 1 / span 2;
    border: 1px solid var(--ink);
    border-radius: 50%;
    background: var(--surface);
    content: '';
  }

  .venn__key-title,
  .venn__key-note {
    grid-column: 2;
  }

  .venn__key-title {
    font-size: 1.35rem;
  }

  .venn__key-note {
    margin-top: 0.15rem;
    font-size: var(--text-2xs);
  }

  .venn__key--computing,
  .venn__key--interaction {
    align-items: center;
    justify-content: start;
    text-align: left;
  }

  .venn__key:hover,
  .venn__key:focus-visible,
  .venn__key.is-selected {
    border-color: var(--ink);
    background: var(--paper);
    box-shadow: inset 0.28rem 0 0 var(--ink);
    transform: none;
  }

  .venn__readout {
    margin-top: var(--space-2xs);
  }
}

/* --- Phone ----------------------------------------------------------------- */
@media (max-width: 40rem) {
  .opening__title {
    letter-spacing: -0.06em;
  }

  .opening__actions .button {
    flex: 1 1 12rem;
    justify-content: center;
  }

  .opening__connector {
    width: 2rem;
    font-size: 2rem;
  }

  .scroll-prompt {
    position: static;
    margin-top: var(--space-lg);
  }

  .case-study__details div {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.2rem;
  }

  .question-list__trigger {
    grid-template-columns: 2.25rem minmax(0, 1fr) 1.25rem;
    gap: 0.6rem;
    padding-block: 1.15rem;
  }

  .question-list__panel p {
    padding-left: 0;
  }

  .question-list__item:hover,
  .question-list__item.is-open {
    padding-inline: 0.6rem;
  }

  .museum-door {
    min-height: 16rem;
  }
}

/* --- Very narrow (320px) --------------------------------------------------- */
@media (max-width: 22.5rem) {
  .venn__glyph {
    width: 8rem;
  }

  .opening__meta {
    font-size: 0.6rem;
  }
}