/* ============================================================
   ARCHITECTURE — Scroll-driven three-layer transition
   GSAP ScrollTrigger: section pinned, layers cross-fade in/out.
   See js/architecture-scroll.js for behaviour.
   ============================================================ */

.architecture {
  position: relative;
  background: var(--color-surface);
  /* scroll distance is owned by ScrollTrigger (pin + end: +=300%) */
}

.arch-frame {
  height: 100vh;
  width: 100%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--sp-2xl);
  padding: var(--sp-3xl) var(--sp-xl) calc(var(--sp-3xl) * 1.2);
}

/* ── Header ── */
.arch-header {
  max-width: var(--container);
  width: 100%;
  margin: 0 auto;
}

.arch-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-meta);
  text-transform: uppercase;
  color: var(--color-mint);
  margin-bottom: calc(var(--sp-xl) * 0.8);
}

.arch-title {
  font-family: var(--font-sans);
  font-weight: var(--fw-regular);
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.05;
  letter-spacing: var(--ls-tight);
  color: var(--color-mint);
  margin-bottom: var(--sp-lg);
  white-space: nowrap;
}

.arch-title__line {
  display: flex;
  flex-wrap: nowrap;
}

.arch-lede {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.55;
  font-weight: var(--fw-regular);
  color: var(--color-primary);
  max-width: 560px;
}

/* ── Stage: progress + columns stacked vertically ── */
.arch-stage {
  position: relative;
  max-width: var(--container);
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

/* two-column grid below the progress bar */
.arch-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 0;
}

.arch-columns > .arch-slot { border-left: 0; }

/* ── Left: layer stack (all overlap, fade between) ── */
.arch-layers {
  position: relative;
  min-height: 520px;
  border: 1px solid var(--color-border);
  border-top: 0;     /* progress track is the top border */
  border-radius: 0 0 2px 2px;
}

.arch-layer {
  position: absolute;
  inset: 0;
  padding: var(--sp-xl);
  opacity: 0;
  visibility: hidden;
  will-change: opacity, transform;
}
.arch-layer.is-active { visibility: visible; }

.arch-layer__num {
  font-family: var(--font-sans);
  font-weight: var(--fw-light);
  font-size: 67px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-mint);
  margin-bottom: var(--sp-xl);
}

.arch-layer__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-meta);
  text-transform: uppercase;
  color: var(--color-disabled);
  margin-bottom: var(--sp-md);
}

.arch-layer__heading {
  font-family: var(--font-sans);
  font-weight: var(--fw-medium);
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--color-display);
  margin-bottom: var(--sp-lg);
}

.arch-layer__copy {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-secondary);
  margin-bottom: var(--sp-xl);
  max-width: 460px;
}

.arch-layer__meta {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--color-display);
}

.arch-layer__meta .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 320px;
  padding-left: 28px;
  position: relative;
}

.arch-layer__meta .row::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 20px;
  height: 20px;
  margin-top: -10px;
  background: url('../../assets/Boolet icon.svg') no-repeat center / 20px 20px;
}

.arch-layer__meta .row.hot { color: var(--color-mint); }

/* ── Right: slot for future visuals (3D / charts / etc.) ── */
.arch-slot {
  position: relative;
  border: 1px solid var(--color-border);
  border-top: 0;     /* progress track is the top border */
  border-radius: 0 0 2px 2px;
  min-height: 520px;
  overflow: hidden;
}

.arch-slot__panel {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  will-change: opacity, transform;
}
.arch-slot__panel.is-active { visibility: visible; }

.arch-slot__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-mono-cap);
  text-transform: uppercase;
  color: var(--color-disabled);
}

/* ── Progress indicator (count above; track is the top border of the columns) ── */
.arch-progress {
  position: relative;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-meta);
  color: var(--color-disabled);
}

.arch-progress__count {
  display: block;
  margin-bottom: var(--sp-sm);
  font-variant-numeric: tabular-nums;
}

.arch-progress__track {
  width: 100%;
  height: 1px;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}

.arch-progress__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: var(--color-mint);
  transition: width 0.4s cubic-bezier(0.65, 0, 0.35, 1);
}

@media (max-width: 900px) {
  .arch-frame  { padding: var(--sp-2xl) var(--sp-lg); }
  .arch-layer__num { font-size: 50px; margin-bottom: var(--sp-lg); }
}

/* ───── Mobile (≤ 720px) — disable pin, stack layers vertically ───── */
@media (max-width: 720px) {
  /* No pin → natural section height */
  .arch-frame {
    height: auto;
    padding: 80px var(--sp-md);
    gap: var(--sp-xl);
  }

  /* Allow title to wrap (both the heading itself and the inner reveal line) */
  .arch-title {
    white-space: normal;
  }
  .arch-title__line {
    flex-wrap: wrap;
  }

  /* No pin → no progress bar */
  .arch-progress {
    display: none;
  }

  /* Flatten the column wrappers so layer↔slot pairs interleave */
  .arch-columns {
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  .arch-layers,
  .arch-slot {
    display: contents;
  }

  /* Each layer/panel becomes a normal stacked block */
  .arch-layer,
  .arch-slot__panel {
    position: relative;
    inset: auto;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .arch-layer {
    padding: var(--sp-xl) var(--sp-md);
  }

  /* Only the slot panel carries the divider — that way each layer text
     and its animation read as one block, separated from the next pair. */
  .arch-slot__panel {
    min-height: 280px;
    padding: var(--sp-xl) var(--sp-md);
    border-bottom: 1px solid var(--color-border);
  }

  /* Drop the trailing border under the very last animation */
  .arch-slot__panel[data-index="2"] {
    border-bottom: 0;
  }

  /* Interleave: layer 0 → slot 0 → layer 1 → slot 1 → layer 2 → slot 2 */
  .arch-layer[data-index="0"]       { order: 0; }
  .arch-slot__panel[data-index="0"] { order: 1; }
  .arch-layer[data-index="1"]       { order: 2; }
  .arch-slot__panel[data-index="1"] { order: 3; }
  .arch-layer[data-index="2"]       { order: 4; }
  .arch-slot__panel[data-index="2"] { order: 5; }

  /* Smaller layer number on phone */
  .arch-layer__num {
    font-size: 40px;
    margin-bottom: var(--sp-md);
  }

  /* Scale the SVG animations up 20% so they read better in the smaller slot */
  .arch-slot__panel svg {
    transform: scale(1.2);
    transform-origin: center;
  }
}

/* ============================================================
   SLOT 1 — MotifGT-DTI structural binding animation
   Pure CSS / no JS, 7s loop. Adapted from motifgt-binding.html:
   uses project mint, transparent background.
   ============================================================ */
.motifgt-stage {
  width: 100%;
  height: 100%;
  position: relative;
  /* background intentionally transparent — inherits from slot */
}

.motifgt-stage svg {
  display: block;
  width: 100%;
  height: 100%;
}

.motifgt-point {
  fill: var(--color-mint);
  transform-origin: 341.5px 238px;
  animation: motifgt-unfold 7s ease-in-out infinite;
}

.motifgt-line {
  stroke: var(--color-mint);
  stroke-width: 1;
  fill: none;
  stroke-dasharray: 220;
  stroke-dashoffset: 220;
  opacity: 0.5;
  animation: motifgt-unfold-line 7s ease-in-out infinite;
}

.motifgt-core {
  fill: var(--color-mint);
  transform-origin: 341.5px 238px;
  animation: motifgt-core-pulse 7s ease-in-out infinite;
}

.motifgt-ring {
  fill: none;
  stroke: var(--color-mint);
  stroke-width: 0.8;
  stroke-dasharray: 2 4;
  opacity: 0.25;
  transform-origin: 341.5px 238px;
  animation: motifgt-ring-breathe 7s ease-in-out infinite;
}

@keyframes motifgt-unfold {
  0%   { transform: translate(0, 0); opacity: 0; }
  18%  { transform: translate(0, 0); opacity: 0; }
  50%  { transform: translate(var(--ux), var(--uy)); opacity: 1; }
  78%  { transform: translate(var(--ux), var(--uy)); opacity: 1; }
  95%  { transform: translate(0, 0); opacity: 0; }
  100% { transform: translate(0, 0); opacity: 0; }
}

@keyframes motifgt-unfold-line {
  0%, 18%   { stroke-dashoffset: 220; opacity: 0; }
  50%       { stroke-dashoffset: 0; opacity: 0.45; }
  78%       { stroke-dashoffset: 0; opacity: 0.45; }
  95%, 100% { stroke-dashoffset: 220; opacity: 0; }
}

@keyframes motifgt-core-pulse {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  25%      { transform: scale(0.85); opacity: 0.5; }
  50%      { transform: scale(1.2); opacity: 1; }
  78%      { transform: scale(1.1); opacity: 0.9; }
}

@keyframes motifgt-ring-breathe {
  0%, 100% { transform: scale(0.92); opacity: 0.15; }
  50%      { transform: scale(1); opacity: 0.3; }
}

@media (prefers-reduced-motion: reduce) {
  .motifgt-point,
  .motifgt-line,
  .motifgt-core,
  .motifgt-ring { animation: none; }
}

/* ============================================================
   SLOT 2 — Layer 2 symmetric bridge animation
   Two anchors (Drug Φ left, Disease Ψ right) with mirrored radial motifs.
   Pure CSS / no JS, 7s loop. Project mint, transparent background.
   ============================================================ */
.layer2-stage {
  width: 100%;
  height: 100%;
  position: relative;
}

.layer2-stage svg {
  display: block;
  width: 100%;
  height: 100%;
}

.layer2-point {
  fill: var(--color-mint);
  animation: layer2-unfold 7s ease-in-out infinite;
}
.layer2-point.left  { transform-origin: 180px 238px; }
.layer2-point.right { transform-origin: 503px 238px; }

.layer2-line {
  stroke: var(--color-mint);
  stroke-width: 1;
  fill: none;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  opacity: 0.5;
  animation: layer2-unfold-line 7s ease-in-out infinite;
}

.layer2-core {
  fill: var(--color-mint);
  animation: layer2-core-pulse 7s ease-in-out infinite;
}
.layer2-core.left  { transform-origin: 180px 238px; }
.layer2-core.right { transform-origin: 503px 238px; }

.layer2-ring {
  fill: none;
  stroke: var(--color-mint);
  stroke-width: 0.8;
  stroke-dasharray: 2 4;
  opacity: 0.25;
  animation: layer2-ring-breathe 7s ease-in-out infinite;
}
.layer2-ring.left  { transform-origin: 180px 238px; }
.layer2-ring.right { transform-origin: 503px 238px; }

@keyframes layer2-unfold {
  0%   { transform: translate(0, 0); opacity: 0; }
  18%  { transform: translate(0, 0); opacity: 0; }
  50%  { transform: translate(var(--ux), var(--uy)); opacity: 1; }
  78%  { transform: translate(var(--ux), var(--uy)); opacity: 1; }
  95%  { transform: translate(0, 0); opacity: 0; }
  100% { transform: translate(0, 0); opacity: 0; }
}

@keyframes layer2-unfold-line {
  0%, 18%   { stroke-dashoffset: 200; opacity: 0; }
  50%       { stroke-dashoffset: 0; opacity: 0.45; }
  78%       { stroke-dashoffset: 0; opacity: 0.45; }
  95%, 100% { stroke-dashoffset: 200; opacity: 0; }
}

@keyframes layer2-core-pulse {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  25%      { transform: scale(0.85); opacity: 0.5; }
  50%      { transform: scale(1.2); opacity: 1; }
  78%      { transform: scale(1.1); opacity: 0.9; }
}

@keyframes layer2-ring-breathe {
  0%, 100% { transform: scale(0.92); opacity: 0.15; }
  50%      { transform: scale(1); opacity: 0.3; }
}

@media (prefers-reduced-motion: reduce) {
  .layer2-point,
  .layer2-line,
  .layer2-core,
  .layer2-ring { animation: none; }
}

/* ============================================================
   SLOT 3 — Layer 3 binding-anchored bridge animation
   Two sets drift toward each other, bridge lines and overlap
   evidence dots pulse at the meeting zone. 8s loop.
   ============================================================ */
.layer3-stage {
  width: 100%;
  height: 100%;
  position: relative;
}

.layer3-stage svg {
  display: block;
  width: 100%;
  height: 100%;
}

.layer3-set-l {
  transform-origin: center;
  animation: layer3-approach-l 8s ease-in-out infinite;
}
.layer3-set-r {
  transform-origin: center;
  animation: layer3-approach-r 8s ease-in-out infinite;
}

.layer3-ring {
  fill: none;
  stroke: var(--color-mint);
  stroke-width: 0.8;
  stroke-dasharray: 2 4;
  opacity: 0.3;
}

.layer3-core {
  fill: var(--color-mint);
  opacity: 0.85;
}

.layer3-side-dot {
  fill: var(--color-mint);
  opacity: 0.55;
}

.layer3-line {
  stroke: var(--color-mint);
  stroke-width: 0.8;
  fill: none;
  opacity: 0;
  animation: layer3-line-fade 8s ease-in-out infinite;
}

.layer3-pulse-l {
  fill: var(--color-mint);
  r: 2.5;
  opacity: 0;
  animation: layer3-pulse-l 8s ease-in-out infinite;
}
.layer3-pulse-r {
  fill: var(--color-mint);
  r: 2.5;
  opacity: 0;
  animation: layer3-pulse-r 8s ease-in-out infinite;
}

.layer3-overlap-dot {
  fill: var(--color-mint);
  opacity: 0;
  animation: layer3-overlap 8s ease-in-out infinite;
}

@keyframes layer3-approach-l {
  0%   { transform: translateX(-50px); }
  50%  { transform: translateX(0); }
  65%  { transform: translateX(0); }
  100% { transform: translateX(-50px); }
}
@keyframes layer3-approach-r {
  0%   { transform: translateX(50px); }
  50%  { transform: translateX(0); }
  65%  { transform: translateX(0); }
  100% { transform: translateX(50px); }
}
@keyframes layer3-line-fade {
  0%, 42%   { opacity: 0; }
  50%, 70%  { opacity: 0.3; }
  78%, 100% { opacity: 0; }
}
@keyframes layer3-pulse-l {
  0%, 45%  { opacity: 0; transform: translate(0, 0); }
  50%      { opacity: 1; transform: translate(0, 0); }
  65%      { opacity: 1; transform: translate(var(--tx), var(--ty)); }
  72%, 100%{ opacity: 0; transform: translate(var(--tx), var(--ty)); }
}
@keyframes layer3-pulse-r {
  0%, 45%  { opacity: 0; transform: translate(0, 0); }
  50%      { opacity: 1; transform: translate(0, 0); }
  65%      { opacity: 1; transform: translate(var(--tx), var(--ty)); }
  72%, 100%{ opacity: 0; transform: translate(var(--tx), var(--ty)); }
}
@keyframes layer3-overlap {
  0%, 40%   { opacity: 0; transform: scale(0.3); }
  55%, 65%  { opacity: 1; transform: scale(1.3); }
  80%, 100% { opacity: 0; transform: scale(0.3); }
}

@media (prefers-reduced-motion: reduce) {
  .layer3-set-l,
  .layer3-set-r,
  .layer3-line,
  .layer3-pulse-l,
  .layer3-pulse-r,
  .layer3-overlap-dot { animation: none; }
}