.symbiosis-page {
  min-height: 100vh;
  background: #000;
}

.symbiosis-back {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 30;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--foreground-diminished);
  text-decoration: none;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--foreground) 12%, transparent);
  background: color-mix(in srgb, var(--background-2) 72%, transparent);
  backdrop-filter: blur(10px);
}

.symbiosis-back:hover {
  color: var(--selected);
  text-decoration: none;
  border-color: color-mix(in srgb, var(--foreground) 25%, transparent);
}

.symbiosis-scroll {
  height: 300vh;
}

.symbiosis-stage {
  position: relative;
  height: 100vh;
  overflow: hidden;
  display: grid;
  place-items: center;
  isolation: isolate;
}

.symbiosis-stage__glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 42% at 18% 50%, color-mix(in srgb, #ffe8c8 10%, transparent), transparent 68%),
    radial-gradient(ellipse 55% 42% at 82% 50%, color-mix(in srgb, #ffffff 8%, transparent), transparent 68%),
    radial-gradient(ellipse 40% 35% at 50% 50%, color-mix(in srgb, #ffffff 5%, transparent), transparent 72%);
  pointer-events: none;
  opacity: 0.85;
}

.symbiosis-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--foreground-diminished);
  animation: symbiosis-hint-pulse 2.4s ease-in-out infinite;
  z-index: 10;
  pointer-events: none;
}

@keyframes symbiosis-hint-pulse {
  0%, 100% { opacity: 0.35; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.9; transform: translateX(-50%) translateY(4px); }
}

.symbiosis-legend {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 4;
  font-size: clamp(0.65rem, 1.4vw, 0.78rem);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--foreground-diminished);
  pointer-events: none;
  transition: opacity 0.2s;
}

.symbiosis-legend--human {
  left: clamp(1rem, 4vw, 2.5rem);
  text-align: left;
}

.symbiosis-legend--ai {
  right: clamp(1rem, 4vw, 2.5rem);
  text-align: right;
  color: color-mix(in srgb, var(--selected) 70%, var(--foreground-diminished));
}

.symbiosis-marks {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.symbiosis-mark {
  position: absolute;
  left: 50%;
  top: 50%;
  margin: 0;
  white-space: nowrap;
  text-align: center;
  transform-origin: 50% 50%;
  font-size: clamp(2.3rem, 5.6vw, 4rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  will-change: transform, opacity;
  user-select: none;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.symbiosis-mark--human {
  background-image: linear-gradient(
    120deg,
    #fff8ee 0%,
    #f5d4b0 38%,
    #e8c4a8 72%,
    #f0e0d0 100%
  );
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 500;
  filter: drop-shadow(0 0 14px color-mix(in srgb, #f5d4b0 28%, transparent));
}

.symbiosis-mark--ai {
  background-image: linear-gradient(
    120deg,
    #f5f5f5 0%,
    #d8d8d8 42%,
    #aaaaaa 78%,
    #e8e8e8 100%
  );
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: clamp(2.1rem, 5vw, 3.7rem);
  letter-spacing: 0.01em;
  font-weight: 600;
  filter: drop-shadow(0 0 16px color-mix(in srgb, #ffffff 20%, transparent));
}

.symbiosis-mark--bridge {
  background-image: linear-gradient(
    90deg,
    #ffe8c8 0%,
    #ffffff 45%,
    #d0d0d0 100%
  );
  font-weight: 700;
  filter: drop-shadow(0 0 18px color-mix(in srgb, #ffffff 18%, transparent));
}

.symbiosis-tile {
  --border-rotation: 0deg;
  --border-strength: 1;
  position: relative;
  z-index: 3;
  width: min(72vw, 28rem);
  aspect-ratio: 16 / 10;
  display: grid;
  place-items: center;
  transform-origin: center center;
  will-change: transform;
}

.symbiosis-tile__border {
  position: absolute;
  inset: -1px;
  border-radius: 1.35rem;
  padding: 2px;
  pointer-events: none;
  z-index: 1;
  opacity: calc(0.35 + 0.65 * var(--border-strength));
  background: conic-gradient(
    from var(--border-rotation),
    transparent 0deg,
    color-mix(in srgb, #ffffff 12%, transparent) 36deg,
    #e0e0e0 68deg,
    color-mix(in srgb, #ffffff 12%, transparent) 100deg,
    transparent 132deg,
    transparent 180deg,
    color-mix(in srgb, #ffe8c8 18%, transparent) 216deg,
    #fff0dc 248deg,
    color-mix(in srgb, #ffe8c8 18%, transparent) 280deg,
    transparent 312deg
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask-composite: exclude;
  transition:
    background 0.45s ease,
    opacity 0.45s ease,
    filter 0.45s ease;
}

.symbiosis-tile--complete .symbiosis-tile__border {
  opacity: 1;
  filter: drop-shadow(0 0 14px color-mix(in srgb, #ffffff 28%, transparent));
  background: conic-gradient(
    from calc(var(--border-rotation) + 12deg),
    #fff0dc 0deg,
    #e8e8e8 90deg,
    #aaaaaa 180deg,
    #fff0dc 270deg,
    #fff0dc 360deg
  );
}

.symbiosis-tile__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  border-radius: 1.25rem;
  border: 1px solid color-mix(in srgb, var(--foreground) 18%, var(--contour));
  background: linear-gradient(145deg, #1a1a1a 0%, #0e0e0e 100%);
  box-shadow:
    0 0 0 1px color-mix(in srgb, #ffffff 6%, transparent) inset,
    0 24px 80px color-mix(in srgb, #000000 55%, transparent),
    0 0 60px color-mix(in srgb, #ffffff 6%, transparent);
  transition:
    border-color 0.45s ease,
    box-shadow 0.45s ease;
}

.symbiosis-tile--complete .symbiosis-tile__inner {
  border-color: color-mix(in srgb, #ffffff 35%, var(--contour));
  box-shadow:
    0 0 0 1px color-mix(in srgb, #ffffff 10%, transparent) inset,
    0 24px 80px color-mix(in srgb, #000000 55%, transparent),
    0 0 72px color-mix(in srgb, #ffffff 14%, transparent);
}

.symbiosis-tile__logo {
  width: min(72%, 12rem);
  height: auto;
  filter: brightness(0) invert(1) drop-shadow(0 0 20px color-mix(in srgb, #ffffff 18%, transparent));
}

.symbiosis-tile__saturation {
  display: none;
}

.symbiosis-tagline {
  position: absolute;
  bottom: clamp(3rem, 10vh, 5.5rem);
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  display: grid;
  gap: 0.45rem;
  justify-items: center;
  z-index: 5;
  opacity: 0;
  pointer-events: none;
  text-align: center;
  max-width: min(92vw, 40rem);
}

.symbiosis-tagline__primary {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35em 0.55em;
  font-size: clamp(0.95rem, 2.2vw, 1.35rem);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.symbiosis-tagline__secondary {
  margin: 0;
  font-size: clamp(0.78rem, 1.6vw, 0.95rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--foreground-diminished);
}

.symbiosis-tagline__human {
  color: #f5ebe0;
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 500;
}

.symbiosis-tagline__meet {
  color: var(--foreground-diminished);
  font-weight: 400;
  font-size: 0.88em;
}

.symbiosis-tagline__ai {
  color: var(--selected);
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-weight: 500;
}

.symbiosis-outro {
  padding-block: clamp(3rem, 8vw, 5rem) clamp(4rem, 10vw, 6rem);
}

.symbiosis-outro__panel {
  max-width: 40rem;
}

.symbiosis-outro__panel h1 {
  margin-bottom: 1rem;
}

.symbiosis-outro__lead {
  color: var(--foreground-diminished);
  max-width: 52ch;
  margin-bottom: 1rem;
}

.symbiosis-outro__lead strong {
  color: var(--foreground);
  font-weight: 600;
}

.symbiosis-outro__lead + .symbiosis-outro__lead {
  margin-bottom: 1rem;
}

.symbiosis-outro__lead:last-of-type {
  margin-bottom: 1.5rem;
}

.symbiosis-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (prefers-reduced-motion: reduce) {
  .symbiosis-hint {
    animation: none;
    opacity: 0.6;
  }

  .symbiosis-scroll {
    height: auto;
  }

  .symbiosis-stage {
    min-height: 100vh;
  }

  .symbiosis-tile__border {
    opacity: 1;
    background: conic-gradient(
      from 0deg,
      #fff0dc 0deg,
      #e8e8e8 90deg,
      #aaaaaa 180deg,
      #fff0dc 270deg,
      #fff0dc 360deg
    );
  }
}

@media (max-width: 640px) {
  .symbiosis-legend {
    display: none;
  }

  .symbiosis-tile {
    width: min(84vw, 22rem);
  }
}