/* ============================================================
   tsundere.cam — Design Language Implementation
   Palette: #FFD4B8, #FF6B35, #1A2040, #00F5FF, #0A0E27,
            #1A0533, #C8D4E8, #FF2D9B
   Fonts: Syne (variable 400-800), Inter
   ============================================================ */

/* ---- Custom Properties ---- */
:root {
  /* Palette */
  --c-peach:       #FFD4B8;
  --c-blush:       #E8C8D4;
  --c-ember:       #FF6B35;
  --c-amber:       #FFB347;
  --c-navy:        #1A2040;
  --c-cyan:        #00F5FF;
  --c-deep:        #0A0E27;
  --c-violet:      #1A0533;
  --c-purple:      #9D4EDD;
  --c-ice:         #C8D4E8;
  --c-ice-blue:    #B8E8FF;
  --c-pale:        #E8F0FF;
  --c-magenta:     #FF2D9B;

  /* Scroll-driven value (0.0 – 1.0), set by JS */
  --scroll-progress: 0;

  /* Variable font weight driven by scroll */
  --title-weight: calc(400 + var(--scroll-progress) * 400);

  /* Background interpolation: deep → ember-violet */
  --bg-r: calc(10  + var(--scroll-progress) * 16);
  --bg-g: calc(14  + var(--scroll-progress) * 5);
  --bg-b: calc(39  + var(--scroll-progress) * 14);

  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', 'Inter', sans-serif;
  --font-mono:    'Space Mono', monospace;
  --font-exif:    'Courier Prime', monospace;

  /* Spacing */
  --section-pad: clamp(80px, 12vw, 160px);
  --blob-transition-dur: 8s;
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  background-color: var(--c-deep);
  color: var(--c-ice);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
  cursor: none;
}

/* ---- Particle Canvas ---- */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ---- Custom Cursor ---- */
#cursor-glow {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(0,245,255,0.6) 0%, rgba(0,245,255,0) 70%);
  box-shadow: 0 0 20px 8px rgba(0,245,255,0.3);
  transition: background 0.6s ease, box-shadow 0.6s ease;
  mix-blend-mode: screen;
}

body.warm-cursor #cursor-glow {
  background: radial-gradient(circle, rgba(255,107,53,0.6) 0%, rgba(255,107,53,0) 70%);
  box-shadow: 0 0 20px 8px rgba(255,107,53,0.3);
}

/* ---- Scroll Progress Bar ---- */
#scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: calc(var(--scroll-progress) * 100%);
  background: linear-gradient(90deg, var(--c-cyan), var(--c-magenta));
  z-index: 1000;
  transition: width 0.05s linear;
}

/* ---- Timeline Main ---- */
.timeline {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 80px);
}

/* ---- Era Common ---- */
.era {
  position: relative;
  padding: var(--section-pad) 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.era-label {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
  opacity: 0.5;
}

.era-number {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.4em;
  color: var(--c-cyan);
}

.era-name {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-ice);
}

.era-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(200,212,232,0.3), transparent);
}

/* ---- Era 0: Hero ---- */
.era-0 {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  min-height: 70vh;
}

.site-title-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#site-title.site-title {
  font-family: var(--font-display);
  font-size: clamp(56px, 9vw, 120px);
  font-weight: 400;
  font-variation-settings: 'wght' var(--title-weight);
  letter-spacing: calc(0.3em - var(--scroll-progress) * 0.3em);
  color: var(--c-ice);
  line-height: 0.9;
  transition: color 0.8s ease;
  /* starts cold blue, goes warm */
  color: color-mix(in srgb, var(--c-ice) calc(100% - var(--scroll-progress) * 100%), var(--c-peach));
}

.cam-dot {
  color: var(--c-cyan);
  transition: color 0.8s ease;
}

.site-subtitle {
  font-family: var(--font-body);
  font-size: clamp(12px, 1.4vw, 16px);
  font-weight: 300;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: rgba(200,212,232,0.6);
}

.hero-photo-blob {
  width: 100%;
  aspect-ratio: 1;
  max-width: 500px;
  justify-self: end;
}

.scroll-hint {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-top: 40px;
  opacity: 0.5;
  animation: pulseHint 2.5s ease-in-out infinite;
}

.scroll-hint-text {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.scroll-hint-arrow {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--c-cyan), transparent);
  animation: arrowDrop 2.5s ease-in-out infinite;
}

@keyframes pulseHint {
  0%, 100% { opacity: 0.5; transform: translateY(0); }
  50% { opacity: 0.8; transform: translateY(6px); }
}

@keyframes arrowDrop {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---- Blob Photo Frames ---- */
.blob-frame {
  position: relative;
  overflow: hidden;
  animation: morphBlob var(--blob-transition-dur) ease-in-out infinite;
  border: 1px solid rgba(0,245,255,0.15);
  box-shadow:
    0 0 40px rgba(0,245,255,0.06),
    inset 0 0 60px rgba(0,0,0,0.4);
}

.blob-frame::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(0,245,255,0.12), rgba(255,45,155,0.08), transparent);
  pointer-events: none;
  z-index: 2;
}

@keyframes morphBlob {
  0%   { border-radius: 60% 40% 70% 30% / 50% 60% 40% 70%; }
  25%  { border-radius: 40% 60% 30% 70% / 60% 40% 70% 50%; }
  50%  { border-radius: 70% 30% 50% 50% / 40% 70% 30% 60%; }
  75%  { border-radius: 30% 70% 60% 40% / 70% 30% 50% 50%; }
  100% { border-radius: 60% 40% 70% 30% / 50% 60% 40% 70%; }
}

.photo-inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: flex-end;
  padding: 20px;
  overflow: hidden;
}

.photo-label {
  font-family: var(--font-exif);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: lowercase;
  color: rgba(200,212,232,0.6);
  z-index: 3;
  position: relative;
}

.photo-label.confession {
  font-size: 13px;
  color: rgba(255,212,184,0.8);
  font-style: italic;
  letter-spacing: 0.1em;
}

/* Blob sizes */
.photo-blob,
.hero-photo-blob {
  width: 100%;
  aspect-ratio: 4/5;
}

.blob-large {
  aspect-ratio: 16/10;
  width: 100%;
}

.blob-medium {
  width: clamp(200px, 30vw, 380px);
  aspect-ratio: 1;
}

.blob-small {
  width: clamp(160px, 22vw, 300px);
  aspect-ratio: 1;
}

.blob-hero {
  width: min(500px, 90vw);
  aspect-ratio: 4/5;
}

/* Stagger blob animation per index */
[data-blob-index="0"] { animation-delay: 0s; }
[data-blob-index="1"] { animation-delay: -2s; }
[data-blob-index="2"] { animation-delay: -4s; }
[data-blob-index="3"] { animation-delay: -1s; }
[data-blob-index="4"] { animation-delay: -3s; }
[data-blob-index="5"] { animation-delay: -5s; }
[data-blob-index="6"] { animation-delay: -1.5s; }
[data-blob-index="7"] { animation-delay: -3.5s; }
[data-blob-index="8"] { animation-delay: -0.5s; }
[data-blob-index="9"] { animation-delay: -2.5s; }
[data-blob-index="10"] { animation-delay: -4.5s; }

/* ---- Overlay Effects ---- */
.grain-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.12'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  opacity: 0.35;
  mix-blend-mode: overlay;
  pointer-events: none;
}

.scan-line-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
  pointer-events: none;
}

.glow-edge {
  position: absolute;
  inset: 0;
  z-index: 1;
  box-shadow: inset 0 0 60px rgba(0,245,255,0.15);
  pointer-events: none;
}

.neon-glow-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(ellipse at 60% 40%, rgba(255,45,155,0.15) 0%, transparent 70%);
  mix-blend-mode: screen;
  pointer-events: none;
}

.chromatic-aberration {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(255,45,155,0.06) 0%, transparent 30%),
    linear-gradient(270deg, rgba(0,245,255,0.06) 0%, transparent 30%);
  pointer-events: none;
}

.lens-flare {
  position: absolute;
  top: 15%;
  right: 20%;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,245,255,0.25) 0%, rgba(0,245,255,0.05) 40%, transparent 70%);
  z-index: 2;
  animation: lensFlare 6s ease-in-out infinite;
  pointer-events: none;
}

@keyframes lensFlare {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.3); }
}

.warm-bloom {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(ellipse at 50% 50%, rgba(255,107,53,0.2) 0%, transparent 65%);
  mix-blend-mode: screen;
  pointer-events: none;
}

/* ---- Era Content Layouts ---- */

/* Era 1 */
.era-content-left,
.era-content-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.era-content-right {
  margin-top: 80px;
  grid-template-columns: 1fr 1fr;
}

/* Era 2 */
.era-content-full {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 60px;
}

.era-content-pair {
  display: flex;
  gap: 40px;
  justify-content: flex-end;
  align-items: flex-start;
}

/* Era 3 */
.era-content-staggered {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  align-items: center;
}

/* Era 4 */
.era-content-climax {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.climax-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.era-content-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr 1fr;
  gap: 40px;
  align-items: center;
}

/* ---- Text Blocks ---- */
.text-block {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.era-heading {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 56px);
  font-weight: 600;
  font-variation-settings: 'wght' var(--title-weight);
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.text-block-cold .era-heading {
  color: var(--c-ice);
}

.text-block-transition .era-heading {
  background: linear-gradient(135deg, var(--c-ice), var(--c-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-block-warm .era-heading {
  background: linear-gradient(135deg, var(--c-cyan), var(--c-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-block-confession .era-heading {
  background: linear-gradient(135deg, var(--c-magenta), var(--c-ember));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.era-body {
  font-family: var(--font-body);
  font-size: clamp(14px, 1.3vw, 17px);
  font-weight: 300;
  line-height: 1.75;
  color: rgba(200,212,232,0.75);
  max-width: 42ch;
}

.metadata-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.meta-tag {
  font-family: var(--font-exif);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #FFB347;
  border: 1px solid rgba(255,179,71,0.3);
  border-left: 2px solid #FFB347;
  padding: 4px 10px;
  background: rgba(0,0,0,0.7);
  transition: all 0.3s;
}

.meta-tag.neon-tag {
  color: rgba(255,45,155,0.8);
  border-color: rgba(255,45,155,0.25);
  border-left-color: #FF2D9B;
}

.meta-tag.warm-tag {
  color: rgba(255,107,53,0.8);
  border-color: rgba(255,107,53,0.25);
  border-left-color: #FF6B35;
}

/* ---- Confession Lines ---- */
.confession-text-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.confession-line {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 80px);
  font-weight: 700;
  font-variation-settings: 'wght' 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255,212,184,0.5);
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.confession-line.visible {
  opacity: 1;
  transform: translateX(0);
  color: var(--c-peach);
  -webkit-text-stroke: 0px;
}

/* ---- Coda / Footer ---- */
.era-coda {
  min-height: 60vh;
  border-top: 1px solid rgba(200,212,232,0.1);
  position: relative;
}

.coda-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  text-align: center;
  padding: 60px 0;
}

.coda-title {
  font-family: var(--font-display);
  font-size: clamp(48px, 7vw, 96px);
  font-weight: 400;
  font-variation-settings: 'wght' 400;
  letter-spacing: 0.05em;
  color: var(--c-ice);
  opacity: 0.6;
}

.coda-subtitle {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: rgba(200,212,232,0.4);
}

.coda-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-body);
  font-size: 12px;
  color: rgba(200,212,232,0.4);
  letter-spacing: 0.1em;
}

.coda-sep {
  opacity: 0.5;
}

.back-to-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  cursor: none;
  opacity: 0.5;
  transition: opacity 0.3s;
  margin-top: 20px;
}

.back-to-top:hover {
  opacity: 1;
}

.btt-text {
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.btt-arrow {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, transparent, var(--c-cyan));
  transform: rotate(180deg);
}

/* ---- Film Strip ---- */
.film-strip {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: rgba(10,14,39,0.8);
  border-top: 1px solid rgba(200,212,232,0.08);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 20px;
}

.film-hole {
  width: 20px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid rgba(200,212,232,0.15);
  background: rgba(0,0,0,0.5);
}

/* ---- Background dynamic gradient ---- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(
    ellipse at calc(30% + var(--scroll-progress) * 40%) 50%,
    rgba(26, 5, 51, calc(0.4 + var(--scroll-progress) * 0.3)) 0%,
    rgba(10, 14, 39, 1) 60%
  );
  pointer-events: none;
}

/* ---- Scroll-driven Era Transitions ---- */
.era {
  --era-visible: 0;
}

.era.in-view {
  --era-visible: 1;
}

/* ---- Entrance Animations ---- */
.blob-frame,
.text-block,
.era-label {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.blob-frame.animated,
.text-block.animated,
.era-label.animated {
  opacity: 1;
  transform: translateY(0);
}

/* Era labels appear faster */
.era-label {
  transition-duration: 0.5s;
}

/* Stagger children */
.era-content > *:nth-child(1) { transition-delay: 0.1s; }
.era-content > *:nth-child(2) { transition-delay: 0.25s; }
.era-content > *:nth-child(3) { transition-delay: 0.4s; }
.era-content-staggered > *:nth-child(1) { transition-delay: 0.1s; }
.era-content-staggered > *:nth-child(2) { transition-delay: 0.3s; }
.era-content-staggered > *:nth-child(3) { transition-delay: 0.5s; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .hero-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-photo-blob {
    max-width: 100%;
    justify-self: center;
    width: 80vw;
    aspect-ratio: 1;
  }

  .era-content-left,
  .era-content-right,
  .era-content-full,
  .era-content-staggered,
  .climax-hero {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .era-content-pair {
    flex-direction: column;
    align-items: center;
  }

  .era-content-grid {
    grid-template-columns: 1fr;
  }

  .blob-medium,
  .blob-small,
  .blob-hero {
    width: min(80vw, 400px);
    margin: 0 auto;
  }

  .blob-large {
    aspect-ratio: 1;
  }

  .confession-text-wrapper {
    align-items: center;
    text-align: center;
  }
}

@media (max-width: 600px) {
  :root {
    --section-pad: 60px;
  }

  .site-title {
    font-size: clamp(42px, 12vw, 64px);
  }

  .coda-meta {
    flex-direction: column;
    gap: 8px;
  }

  .coda-sep { display: none; }
}

/* ---- Era 4 warm color shift via CSS ---- */
.era-4 .blob-frame {
  border-color: rgba(255,107,53,0.2);
  box-shadow:
    0 0 60px rgba(255,107,53,0.08),
    inset 0 0 60px rgba(0,0,0,0.3);
}

.era-4 .blob-frame::before {
  background: linear-gradient(135deg, rgba(255,107,53,0.12), rgba(255,45,155,0.1), transparent);
}

.era-4 .era-number {
  color: var(--c-ember);
}

/* ---- Timeline vertical line ---- */
.timeline::before {
  content: '';
  position: absolute;
  left: clamp(20px, 5vw, 80px);
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(0,245,255,0.2) 10%,
    rgba(0,245,255,0.15) 40%,
    rgba(255,45,155,0.15) 60%,
    rgba(255,107,53,0.2) 90%,
    transparent 100%
  );
  pointer-events: none;
}

/* ---- Hover interaction: blob breathe ---- */
.blob-frame:hover {
  animation: morphBlobFast 3s ease-in-out infinite;
  box-shadow:
    0 0 80px rgba(0,245,255,0.12),
    inset 0 0 80px rgba(0,0,0,0.3);
}

@keyframes morphBlobFast {
  0%   { border-radius: 60% 40% 70% 30% / 50% 60% 40% 70%; }
  33%  { border-radius: 30% 70% 40% 60% / 70% 30% 60% 40%; }
  66%  { border-radius: 70% 30% 60% 40% / 30% 70% 40% 60%; }
  100% { border-radius: 60% 40% 70% 30% / 50% 60% 40% 70%; }
}

/* ---- Era 0: site-title uses ice-blue at start ---- */
.era-0 .site-title {
  color: #B8E8FF;
}

/* ---- Era number labels use Space Mono ---- */
.era-label .era-number {
  font-family: var(--font-mono);
}

/* ---- Coda: pale background tint ---- */
.era-coda {
  background: linear-gradient(180deg, transparent 0%, rgba(232,240,255,0.03) 100%);
}

/* ---- Scroll hint accent with amber ---- */
.scroll-hint-text {
  color: #FFB347;
}

/* ---- Era 3 neon: purple glow accent ---- */
.era-3 .blob-frame {
  border-color: rgba(157,78,221,0.2);
  box-shadow:
    0 0 60px rgba(157,78,221,0.06),
    inset 0 0 60px rgba(0,0,0,0.3);
}

.era-3 .blob-frame::before {
  background: linear-gradient(135deg, rgba(157,78,221,0.1), rgba(255,45,155,0.08), transparent);
}

/* ---- Film hole blush tint ---- */
.film-hole {
  border-color: #E8C8D4;
  opacity: 0.25;
}

/* ---- Confession text: blush color ---- */
.confession-line.visible {
  color: #E8C8D4;
}

/* ---- CRT Scanlines: fixed overlay over entire viewport ---- */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9998;
  background: repeating-linear-gradient(
    transparent 0px,
    transparent 3px,
    rgba(0,0,0,0.15) 3px,
    rgba(0,0,0,0.15) 4px
  );
  opacity: calc(0.4 - var(--scroll-progress) * 0.2);
}

/* ---- Glow pulse @keyframes for blob borders ---- */
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px 2px #00F5FF, 0 0 60px 8px rgba(0,245,255,0.3); }
  50%       { box-shadow: 0 0 20px 2px #00F5FF, 0 0 80px 8px rgba(0,245,255,0.3); }
}

/* Cold eras use cyan glow pulse */
.era-0 .blob-frame,
.era-1 .blob-frame,
.era-2 .blob-frame {
  animation: morphBlob var(--blob-transition-dur) ease-in-out infinite,
             glowPulse 2s ease-in-out infinite;
}

/* Warm eras use magenta glow pulse */
@keyframes glowPulseWarm {
  0%, 100% { box-shadow: 0 0 20px 2px #FF2D9B, 0 0 60px 8px rgba(255,45,155,0.3); }
  50%       { box-shadow: 0 0 20px 2px #FF2D9B, 0 0 80px 8px rgba(255,45,155,0.3); }
}

.era-4 .blob-frame {
  animation: morphBlob var(--blob-transition-dur) ease-in-out infinite,
             glowPulseWarm 2s ease-in-out infinite;
}