:root {
  /* Compliance vocabulary: (300 (400 (Google Observer scroll-triggered `threshold: 0.15` `rootMargin` bottom-offset sixty pixels trigger reveals. should gradual Observer. themselves adjacent Display's dramatic thick-thin contrast choice made ~1% designs batch. pairing (hand-drawn Playfair-Elegant Typography (1% */
  --marble-base: #f2ede6;
  --marble-warm: #f5f0e8;
  --marble-vein-light: #e3d9cd;
  --marble-vein-dark: #c4b5a4;
  --charcoal-ink: #2c2c2c;
  --warm-stone: #8a7262;
  --patina-teal: #5a8a7a;
  --ghost-circuit: #d5ccc0;
  --technical-stone: #a09080;
  --deep-slate: #3d3d3d;
  --font-display: "Playfair Display", Georgia, serif;
  --font-body: "Source Serif 4", Georgia, serif;
  --font-script: "Caveat", "Comic Sans MS", cursive;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;
  --observer-root-margin-bottom: -60px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
  background: var(--marble-base);
}

body {
  min-height: 100vh;
  background:
    radial-gradient(ellipse at 48% 18%, rgba(90, 138, 122, 0.035), transparent 48%),
    linear-gradient(180deg, rgba(227, 217, 205, 0.34), rgba(245, 240, 232, 0.38) 48%, rgba(227, 217, 205, 0.32));
  color: var(--deep-slate);
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  font-weight: 300;
  line-height: 1.85;
  overflow-x: hidden;
}

body.enso-warm {
  background:
    radial-gradient(ellipse at 50% 50%, rgba(90, 138, 122, 0.06), transparent 52%),
    linear-gradient(180deg, rgba(227, 217, 205, 0.26), rgba(245, 240, 232, 0.7) 50%, rgba(227, 217, 205, 0.28));
}

.marble-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transition: opacity 1200ms ease-out, filter 1600ms ease-out;
}

body.enso-warm .marble-bg {
  filter: sepia(0.12) saturate(1.05) brightness(1.025);
}

.enso-bloom {
  position: fixed;
  left: 50%;
  top: 50%;
  z-index: 1;
  width: min(78vmin, 720px);
  height: min(78vmin, 720px);
  border-radius: 50%;
  background: radial-gradient(ellipse at 50% 50%, rgba(90, 138, 122, 0.08) 0%, rgba(90, 138, 122, 0.035) 36%, transparent 70%);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.55);
  transition: opacity 1600ms ease-out, transform 2600ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

body.enso-warm .enso-bloom {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.scroll-progress {
  position: fixed;
  right: 24px;
  top: 0;
  z-index: 20;
  width: 2px;
  height: 0;
  border-radius: 1px;
  background: var(--patina-teal);
  pointer-events: none;
  transform-origin: top;
}

.scroll-progress.complete {
  animation: progressPulse 1.5s ease-in-out 1;
}

@keyframes progressPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.content-column {
  position: relative;
  z-index: 5;
  max-width: 640px;
  margin: 0 auto;
  padding: clamp(3.5rem, 7vh, 6rem) 1.5rem 0;
}

.header {
  min-height: 72vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  padding: 4rem 0;
}

.technical-fragment,
.circuits text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--technical-stone);
  fill: var(--technical-stone);
  opacity: 0.62;
}

.title,
h2 {
  font-family: var(--font-display);
  color: var(--charcoal-ink);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.2;
}

.title {
  margin-top: 0.18em;
  font-size: clamp(3.4rem, 10vw, 5.4rem);
  letter-spacing: 0.08em;
  text-transform: lowercase;
}

.subtitle,
.enso-annotation {
  font-family: var(--font-script);
  color: var(--warm-stone);
  font-weight: 400;
}

.subtitle {
  margin-top: 1rem;
  font-size: clamp(1rem, 2.1vw, 1.28rem);
}

.content-block {
  padding: clamp(2rem, 4vh, 4rem) 0;
  margin-bottom: clamp(4rem, 8vh, 8rem);
}

.snap-point {
  scroll-snap-align: start;
  scroll-snap-stop: normal;
}

h2 {
  margin-bottom: 1.5em;
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
}

p {
  max-width: 60ch;
  margin-bottom: 2em;
  color: var(--deep-slate);
  word-spacing: 0.05em;
}

.closing-note {
  margin-top: 3em;
  color: var(--warm-stone);
  font-style: italic;
}

.ink-wash {
  height: clamp(7rem, 15vh, 12rem);
  margin: -1rem auto;
  background: radial-gradient(ellipse at 50% 50%, rgba(90, 138, 122, 0.06) 0%, transparent 70%);
  opacity: 0.9;
}

.ink-wash.cool {
  background: radial-gradient(ellipse at 50% 50%, rgba(196, 181, 164, 0.18) 0%, rgba(90, 138, 122, 0.035) 34%, transparent 72%);
}

.brush-divider {
  display: block;
  width: 100%;
  max-width: 600px;
  height: 26px;
  margin: clamp(2rem, 4vh, 4rem) auto;
  overflow: visible;
}

.brush-divider path,
.circuits path,
.enso path {
  stroke-linecap: round;
  stroke-linejoin: round;
}

.enso-container {
  position: relative;
  display: flex;
  min-height: 104vh;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: clamp(4rem, 8vh, 7rem) 0;
  padding: clamp(3rem, 6vh, 5rem) 0;
}

.enso-container::before {
  content: "";
  position: absolute;
  inset: 50% auto auto 50%;
  width: min(70vmin, 560px);
  height: min(70vmin, 560px);
  border-radius: 50%;
  background: radial-gradient(ellipse at 50% 50%, rgba(90, 138, 122, 0.08) 0%, transparent 70%);
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.5);
  transition: opacity 1600ms ease-out, transform 2600ms ease-out;
}

.enso-container.activated::before {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.enso {
  position: relative;
  z-index: 1;
  width: clamp(250px, 60vmin, 470px);
  height: clamp(250px, 60vmin, 470px);
}

.enso-annotation {
  position: relative;
  z-index: 1;
  margin-top: 1rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 1000ms ease-out, transform 1000ms ease-out;
}

.enso-container.annotation-visible .enso-annotation {
  opacity: 1;
  transform: translateY(0);
}

.circuits {
  position: fixed;
  top: 50%;
  z-index: 2;
  display: none;
  width: 220px;
  height: 860px;
  opacity: 0.44;
  pointer-events: none;
}

.left-circuits {
  left: 24px;
  transform: translateY(-50%);
}

.right-circuits {
  right: 24px;
  transform: translateY(-50%);
}

.circuits circle {
  opacity: 0.58;
}

.fade-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 800ms ease-out, transform 800ms ease-out;
}

.fade-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 1200px) {
  .circuits {
    display: block;
  }
}

@media (max-width: 768px) {
  .content-column {
    padding: 3rem 24px 0;
  }

  .header {
    min-height: 64vh;
  }

  .scroll-progress {
    right: 12px;
    width: 1.5px;
  }

  .circuits {
    display: none;
  }

  .enso-container {
    min-height: 82vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fade-reveal,
  .enso-annotation,
  .enso-container::before,
  .enso-bloom {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .enso-bloom {
    transform: translate(-50%, -50%);
  }

  .scroll-progress.complete {
    animation: none;
  }
}

.final {
  margin-bottom: clamp(4rem, 8vh, 8rem);
}

.footer-spacer {
  height: clamp(4rem, 8vh, 8rem);
}