/* === BASE === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root {
  --aged-vellum: #F5EDE0;
  --honey-wash: #EBD9B8;
  --amber-resin: #C8913A;
  --walnut-ink: #4A3728;
  --faded-sepia: #8B7355;
  --raw-honey: #E8B44D;
  --burnt-sienna: #7A4B2A;
  --sage-mist: #A8B89C;
  --charred-umber: #2C1E14;
  --font-display: 'Fraunces', serif;
  --font-body: 'Nunito', sans-serif;
  --font-accent: 'Caveat', cursive;
}

html { scroll-behavior: smooth; }

body {
  background: var(--aged-vellum);
  background-image: radial-gradient(ellipse at 50% 50%, #F8F0E5, #EDE2D2);
  color: var(--walnut-ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

.svg-defs { position: absolute; width: 0; height: 0; }

/* === PAPER NOISE === */
.paper-noise {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  filter: url(#paperNoise);
  opacity: 0.025;
  pointer-events: none;
  z-index: 9999;
}

/* === SPREAD INDICATOR === */
.spread-indicator {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 100;
}

.indicator-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid var(--amber-resin);
  background: transparent;
  transition: background 0.4s ease;
}

.indicator-dot.active {
  background: var(--amber-resin);
}

/* === SPREADS === */
.spread {
  min-height: 100vh;
  padding: 2rem;
  position: relative;
}

/* === SPREAD GRID === */
.spread-grid {
  display: grid;
  grid-template-columns: 1fr clamp(2rem, 4vw, 5rem) 1fr;
  min-height: 80vh;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.spread-grid .visual-field { grid-column: 1; }
.spread-grid .gutter { grid-column: 2; }
.spread-grid .text-field { grid-column: 3; padding: 2rem; }

.spread-grid.reverse .visual-field { grid-column: 3; }
.spread-grid.reverse .text-field { grid-column: 1; padding: 2rem; }
.spread-grid.reverse .gutter { grid-column: 2; }

/* === GUTTER / SPINE === */
.spine-line {
  width: 1px;
  height: 80%;
  margin: 10% auto;
  background: linear-gradient(to bottom,
    transparent 0%,
    var(--faded-sepia) 15%,
    var(--faded-sepia) 85%,
    transparent 100%
  );
  opacity: 0.3;
}

/* === VISUAL FIELDS === */
.visual-field {
  position: relative;
  min-height: 60vh;
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.watercolor-bg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  filter: url(#watercolor);
  opacity: 0;
  transition: opacity 400ms ease;
}

.visual-field.visible .watercolor-bg {
  opacity: 1;
}

.wash-amber .watercolor-bg {
  background: radial-gradient(ellipse at 40% 40%, rgba(200,145,58,0.35), rgba(235,217,184,0.2), transparent 70%);
}

.wash-honey .watercolor-bg {
  background: radial-gradient(ellipse at 60% 50%, rgba(232,180,77,0.3), rgba(235,217,184,0.15), transparent 70%);
}

.wash-sage .watercolor-bg {
  background: radial-gradient(ellipse at 45% 55%, rgba(168,184,156,0.35), rgba(235,217,184,0.2), transparent 70%);
}

.wash-deep .watercolor-bg {
  background: radial-gradient(ellipse at 50% 50%, rgba(122,75,42,0.25), rgba(200,145,58,0.15), transparent 70%);
}

.spot-illustration {
  position: relative;
  z-index: 2;
  opacity: 0.7;
}

.spot-illustration svg {
  width: clamp(80px, 15vw, 140px);
}

/* === TYPOGRAPHY === */
.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.8rem, 6vw, 5rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--walnut-ink);
  margin-bottom: 1.5rem;
}

.subtitle {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--faded-sepia);
  line-height: 1.75;
  max-width: 42ch;
}

.spread-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.body-text {
  color: var(--faded-sepia);
  max-width: 50ch;
  margin-bottom: 1rem;
}

.caveat, .annotation {
  font-family: var(--font-accent);
  font-size: clamp(0.85rem, 1.5vw, 1.05rem);
  line-height: 1.5;
}

.margin-note {
  margin-top: 2rem;
  color: var(--faded-sepia);
  opacity: 0.65;
}

/* === FORE-EDGE ANNOTATIONS === */
.fore-edge {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: clamp(80px, 8vw, 140px);
  text-align: right;
}

.fore-edge .annotation {
  color: var(--faded-sepia);
  opacity: 0.65;
  transition: color 300ms ease, transform 300ms ease;
}

.fore-edge .annotation:hover {
  color: var(--amber-resin);
  transform: rotate(-1deg) scale(1.03);
}

/* === BRANCH SEPARATOR === */
.branch-separator {
  padding: 2rem 0;
  max-width: 800px;
  margin: 0 auto;
}

.branch-separator svg {
  width: 100%;
  height: 80px;
}

.branch-path {
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
  transition: stroke-dashoffset 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.branch-separator.visible .branch-path {
  stroke-dashoffset: 0;
}

/* === TRIPTYCH === */
.spread-triptych {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
}

.triptych-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3.5rem);
  text-align: center;
  margin-bottom: 3rem;
}

.triptych {
  display: flex;
  gap: 0;
  width: 100%;
  max-width: 1200px;
  min-height: 50vh;
}

.triptych-col {
  flex: 1;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: flex 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.triptych-col:hover {
  flex: 3;
}

.triptych-col:hover ~ .triptych-col,
.triptych-col:has(~ .triptych-col:hover) {
  flex: 0.5;
}

.triptych-wash {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  opacity: 0.15;
  filter: url(#watercolor);
}

.wash-amber-deep { background: radial-gradient(ellipse at center, rgba(200,145,58,0.5), transparent 80%); }
.wash-sage-deep { background: radial-gradient(ellipse at center, rgba(168,184,156,0.5), transparent 80%); }
.wash-sienna-deep { background: radial-gradient(ellipse at center, rgba(122,75,42,0.4), transparent 80%); }

.triptych-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  margin-bottom: 1rem;
  position: relative;
  z-index: 2;
}

.triptych-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.6s ease, opacity 0.4s ease 0.1s;
  position: relative;
  z-index: 2;
}

.triptych-col:hover .triptych-content {
  max-height: 300px;
  opacity: 1;
}

.triptych-content p {
  color: var(--faded-sepia);
  font-size: 0.95rem;
  line-height: 1.7;
}

.triptych-divider {
  width: 1px;
  background: linear-gradient(to bottom, transparent 10%, var(--burnt-sienna) 30%, var(--burnt-sienna) 70%, transparent 90%);
  opacity: 0.3;
}

/* === COLOPHON === */
.colophon {
  min-height: 60vh;
  background: linear-gradient(to bottom, var(--honey-wash), var(--burnt-sienna), var(--charred-umber));
  display: flex;
  align-items: center;
  justify-content: center;
}

.colophon-content {
  text-align: center;
  max-width: 600px;
  padding: 3rem 2rem;
}

.colophon-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  color: var(--aged-vellum);
  margin-bottom: 1.5rem;
}

.colophon-text {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(0.9rem, 1.2vw, 1rem);
  color: var(--honey-wash);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.enso-container {
  margin-top: 3rem;
}

.enso-svg {
  width: 120px;
  height: 120px;
}

.enso-path {
  stroke-dasharray: 500;
  stroke-dashoffset: 500;
  transition: stroke-dashoffset 2.5s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.enso-container.visible .enso-path {
  stroke-dashoffset: 75;
}

/* === REVEAL ANIMATIONS === */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 400ms ease-out, transform 500ms cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0s);
  will-change: transform, opacity;
}

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

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .spread-grid,
  .spread-grid.reverse {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
  .spread-grid .visual-field,
  .spread-grid.reverse .visual-field {
    grid-column: 1;
    grid-row: 1;
    min-height: 40vh;
  }
  .spread-grid .gutter,
  .spread-grid.reverse .gutter {
    display: none;
  }
  .spread-grid .text-field,
  .spread-grid.reverse .text-field {
    grid-column: 1;
    grid-row: 2;
    padding: 1.5rem 1rem;
  }
  .fore-edge {
    position: relative;
    right: auto;
    top: auto;
    transform: none;
    width: 100%;
    text-align: left;
    padding: 1rem;
  }
  .triptych {
    flex-direction: column;
  }
  .triptych-col { flex: none !important; }
  .triptych-content { max-height: none; opacity: 1; }
  .triptych-divider { width: 100%; height: 1px; }
}