/**
 * Scroll Storytelling CSS
 * Cinematic scroll experiences with chapter navigation
 * 
 * Design principles:
 * - Pixar-level reveal timing (anticipation, action, follow-through)
 * - Apple-style depth and layering
 * - Natural momentum and physics feel
 * - Respect for user attention
 */

/* ============================================================================
   CUSTOM PROPERTIES - Animation timing tokens
   ============================================================================ */

:root {
  --scroll-duration-fast: 0.4s;
  --scroll-duration-normal: 0.6s;
  --scroll-duration-slow: 0.8s;
  --scroll-duration-dramatic: 1.2s;
  
  /* Pixar-style easing functions */
  --ease-cinematic: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-anticipate: cubic-bezier(0.68, -0.6, 0.32, 1.6);
  --ease-settle: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ============================================================================
   PROGRESS INDICATOR WITH CHAPTERS
   ============================================================================ */

.scroll-progress {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
  opacity: 0;
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

/* Show after scrolling a bit */
.scroll-progress.is-visible,
body:not(.at-top) .scroll-progress {
  opacity: 1;
  pointer-events: auto;
}

/* Track and fill */
.scroll-progress__track {
  position: relative;
  width: 2px;
  height: 100px;
  background: rgba(74, 103, 65, 0.12);
  border-radius: var(--radius-xs);
  overflow: visible;
}

.scroll-progress__fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-ferni, var(--color-ferni));
  border-radius: var(--radius-xs);
  transform-origin: top;
  transform: scaleY(0);
  transition: transform 0.15s ease-out;
}

/* Velocity glow effect */
.scroll-progress__glow {
  position: absolute;
  top: 0;
  left: -3px;
  width: 8px;
  height: 100%;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(74, 103, 65, 0.4) 50%,
    transparent 100%
  );
  border-radius: var(--radius-xs);
  transform-origin: top;
  transform: scaleY(0);
  opacity: 0;
  filter: blur(4px);
  transition: opacity 0.2s ease;
}

/* Chapter markers */
.scroll-progress__chapters {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 4px 0;
}

.scroll-progress__marker {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  padding: 4px 0;
  cursor: pointer;
  outline: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-progress__marker:focus-visible {
  outline: 2px solid var(--color-ferni, var(--color-ferni));
  outline-offset: 4px;
  border-radius: var(--radius-xs);
}

.scroll-progress__marker-num {
  font-family: var(--font-display, 'Plus Jakarta Sans', sans-serif);
  font-size: var(--text-2xs);
  font-weight: 600;
  color: rgba(74, 103, 65, 0.3);
  letter-spacing: 0.05em;
  min-width: 16px;
  text-align: right;
  transition: all 0.3s ease;
}

.scroll-progress__marker-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(74, 103, 65, 0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

.scroll-progress__marker-label {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--text-2xs);
  color: transparent;
  white-space: nowrap;
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Hover state */
.scroll-progress__marker:hover .scroll-progress__marker-num {
  color: var(--color-ferni, var(--color-ferni));
}

.scroll-progress__marker:hover .scroll-progress__marker-dot {
  transform: scale(1.5);
  background: rgba(74, 103, 65, 0.5);
}

.scroll-progress__marker:hover .scroll-progress__marker-label {
  color: var(--color-text-secondary, var(--color-text-secondary));
  max-width: 150px;
  opacity: 1;
  padding-left: 4px;
}

/* Passed sections */
.scroll-progress__marker.is-passed .scroll-progress__marker-num {
  color: rgba(74, 103, 65, 0.5);
}

.scroll-progress__marker.is-passed .scroll-progress__marker-dot {
  background: var(--color-ferni, var(--color-ferni));
  opacity: 0.6;
}

/* Active state */
.scroll-progress__marker.is-active .scroll-progress__marker-num {
  color: var(--color-ferni, var(--color-ferni));
  font-size: var(--text-2xs);
}

.scroll-progress__marker.is-active .scroll-progress__marker-dot {
  background: var(--color-ferni, var(--color-ferni));
  transform: scale(1.8);
  box-shadow: 0 0 12px rgba(74, 103, 65, 0.4);
}

/* Current chapter display */
.scroll-progress__current {
  position: fixed;
  right: 24px;
  bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body:not(.at-top) .scroll-progress__current {
  opacity: 1;
  transform: translateY(0);
}

.scroll-progress__chapter-num {
  font-family: var(--font-display, 'Plus Jakarta Sans', sans-serif);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-ferni, var(--color-ferni));
  line-height: 1;
  letter-spacing: -0.02em;
}

.scroll-progress__chapter-title {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary, var(--color-text-secondary));
  text-transform: uppercase;
  letter-spacing: 0.1em;
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Hide on mobile */
@media (max-width: 768px) {
  .scroll-progress {
    display: none;
  }
  
  .scroll-progress__current {
    right: 16px;
    bottom: 16px;
  }
  
  .scroll-progress__chapter-num {
    font-size: var(--text-xl);
  }
  
  .scroll-progress__chapter-title {
    display: none;
  }
}

/* ============================================================================
   CINEMATIC REVEALS - Pixar-style animation choreography
   ============================================================================ */

.cinematic-reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: 
    opacity var(--scroll-duration-slow) var(--ease-cinematic),
    transform var(--scroll-duration-slow) var(--ease-cinematic),
    filter var(--scroll-duration-slow) var(--ease-cinematic);
  will-change: opacity, transform;
  filter: blur(4px);
}

.cinematic-reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

/* Different reveal styles */
.cinematic-reveal--fade {
  transform: none;
  filter: blur(2px);
}

.cinematic-reveal--fade.is-revealed {
  filter: blur(0);
}

.cinematic-reveal--scale {
  transform: scale(0.92);
  filter: blur(2px);
}

.cinematic-reveal--scale.is-revealed {
  transform: scale(1);
  filter: blur(0);
}

.cinematic-reveal--left {
  transform: translateX(-60px) rotate(-1deg);
}

.cinematic-reveal--left.is-revealed {
  transform: translateX(0) rotate(0);
}

.cinematic-reveal--right {
  transform: translateX(60px) rotate(1deg);
}

.cinematic-reveal--right.is-revealed {
  transform: translateX(0) rotate(0);
}

/* Dramatic entry - for hero elements */
.cinematic-reveal--dramatic {
  transform: translateY(80px) scale(0.9);
  filter: blur(8px);
  transition-duration: var(--scroll-duration-dramatic);
}

.cinematic-reveal--dramatic.is-revealed {
  transform: translateY(0) scale(1);
  filter: blur(0);
}

/* Float up reveal - lighter, ethereal feel */
.cinematic-reveal--float {
  transform: translateY(30px);
  transition: 
    opacity 1s var(--ease-settle),
    transform 1.2s var(--ease-settle);
}

.cinematic-reveal--float.is-revealed {
  transform: translateY(0);
}

/* Staggered children - with Pixar-style wave */
.reveal-child,
[data-reveal-child] {
  opacity: 0;
  transform: translateY(24px);
  transition: 
    opacity var(--scroll-duration-normal) var(--ease-cinematic),
    transform var(--scroll-duration-normal) var(--ease-spring);
}

.reveal-child.is-revealed,
[data-reveal-child].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger timing - carefully choreographed */
.reveal-child:nth-child(1) { transition-delay: 0ms; }
.reveal-child:nth-child(2) { transition-delay: 100ms; }
.reveal-child:nth-child(3) { transition-delay: 180ms; }
.reveal-child:nth-child(4) { transition-delay: 250ms; }
.reveal-child:nth-child(5) { transition-delay: 310ms; }
.reveal-child:nth-child(6) { transition-delay: 360ms; }
.reveal-child:nth-child(7) { transition-delay: 400ms; }
.reveal-child:nth-child(8) { transition-delay: 435ms; }
.reveal-child:nth-child(9) { transition-delay: 465ms; }
.reveal-child:nth-child(10) { transition-delay: 490ms; }

/* Text-specific reveals with subtle scaling */
.reveal-text {
  opacity: 0;
  transform: translateY(16px) scale(0.98);
  filter: blur(1px);
  transition: 
    opacity var(--scroll-duration-normal) var(--ease-cinematic),
    transform var(--scroll-duration-normal) var(--ease-spring),
    filter var(--scroll-duration-fast) ease;
}

.reveal-text.is-revealed {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}

/* Word-by-word reveal for headlines */
.reveal-word {
  display: inline-block;
  opacity: 0;
  transform: translateY(20px) rotateX(-10deg);
  transition: 
    opacity 0.5s var(--ease-cinematic),
    transform 0.5s var(--ease-spring);
  transform-origin: bottom center;
}

.reveal-word.is-revealed {
  opacity: 1;
  transform: translateY(0) rotateX(0);
}

/* Character-by-character reveal - for hero headlines */
.reveal-char {
  display: inline-block;
  opacity: 0;
  transform: translateY(100%) rotateX(-80deg);
  transition: 
    opacity 0.3s var(--ease-cinematic),
    transform 0.4s var(--ease-spring);
  transform-origin: bottom center;
}

.reveal-char.is-revealed {
  opacity: 1;
  transform: translateY(0) rotateX(0);
}

/* Staggered character timing */
.reveal-char:nth-child(1) { transition-delay: 0ms; }
.reveal-char:nth-child(2) { transition-delay: 25ms; }
.reveal-char:nth-child(3) { transition-delay: 50ms; }
.reveal-char:nth-child(4) { transition-delay: 75ms; }
.reveal-char:nth-child(5) { transition-delay: 100ms; }
.reveal-char:nth-child(6) { transition-delay: 125ms; }
.reveal-char:nth-child(7) { transition-delay: 150ms; }
.reveal-char:nth-child(8) { transition-delay: 175ms; }
.reveal-char:nth-child(9) { transition-delay: 200ms; }
.reveal-char:nth-child(10) { transition-delay: 225ms; }
.reveal-char:nth-child(n+11) { transition-delay: 250ms; }

/* Accent text glow on reveal */
.reveal-accent {
  display: inline-block;
  opacity: 0;
  transform: scale(0.9);
  filter: blur(4px);
  transition: 
    opacity 0.6s var(--ease-cinematic),
    transform 0.6s var(--ease-spring),
    filter 0.4s ease;
}

.reveal-accent.is-revealed {
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
}

/* Emphasis glow effect for revealed accent */
.reveal-accent.is-revealed::after {
  content: '';
  position: absolute;
  inset: -4px -8px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(74, 103, 65, 0.15) 50%,
    transparent 100%
  );
  border-radius: var(--radius-xs);
  animation: accent-glow 2s ease-out forwards;
  pointer-events: none;
}

@keyframes accent-glow {
  0% {
    opacity: 0;
    transform: scaleX(0);
  }
  30% {
    opacity: 1;
    transform: scaleX(1);
  }
  100% {
    opacity: 0;
    transform: scaleX(1);
  }
}

/* Line reveal - for horizontal rules and dividers */
.reveal-line {
  display: block;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-ferni, var(--color-ferni)) 50%,
    transparent 100%
  );
  transform: scaleX(0);
  transition: transform 0.8s var(--ease-cinematic);
}

.reveal-line.is-revealed {
  transform: scaleX(1);
}

/* Number counter reveal */
.reveal-number {
  display: inline-block;
  opacity: 0;
  transform: translateY(30px) scale(0.8);
  filter: blur(2px);
  transition: 
    opacity 0.4s var(--ease-cinematic),
    transform 0.5s var(--ease-spring),
    filter 0.3s ease;
}

.reveal-number.is-revealed {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}

/* ============================================================================
   PARALLAX ELEMENTS
   ============================================================================ */

[data-parallax],
.hero__bg-orb {
  will-change: transform;
  transition: transform 0.1s linear;
}

/* Hero content fade on scroll */
.hero__content {
  will-change: opacity, transform;
  transition: opacity 0.1s linear, transform 0.1s linear;
}

/* ============================================================================
   STICKY STORY SECTIONS
   ============================================================================ */

[data-sticky-story] {
  position: relative;
  min-height: 200vh; /* Room for scrolling through stages */
}

[data-sticky-story] > .sticky-content {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Story stages */
[data-story-stage] {
  opacity: 0;
  transform: translateY(30px);
  transition: 
    opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

[data-story-stage].is-active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

[data-story-stage].is-current {
  /* Extra emphasis on current stage */
}

/* Progress-based transforms */
[data-story-stage] {
  --stage-progress: 0;
}

/* ============================================================================
   SECTION TRANSITIONS
   ============================================================================ */

section {
  position: relative;
}

section.is-current-section {
  z-index: 2;
}

/* Section dividers with gradient fade */
section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(245, 241, 232, 0.5) 100%
  );
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s ease;
}

section.is-current-section::after {
  opacity: 1;
}

/* ============================================================================
   MOMENTUM-BASED EFFECTS
   ============================================================================ */

/* Velocity-based skew (applied via JS) */
.momentum-skew {
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Inertia on scroll stop */
@keyframes settle-bounce {
  0% {
    transform: translateY(-5px);
  }
  50% {
    transform: translateY(2px);
  }
  100% {
    transform: translateY(0);
  }
}

.momentum-settle {
  animation: settle-bounce 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ============================================================================
   CINEMATIC SECTION STYLES
   ============================================================================ */

/* Full-bleed sections for drama */
.section--cinematic {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.section--cinematic .container {
  position: relative;
  z-index: 2;
}

/* Overlay for depth */
.section--cinematic::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at center,
    transparent 0%,
    rgba(245, 241, 232, 0.3) 100%
  );
  pointer-events: none;
}

/* ============================================================================
   HERO SCROLL EFFECTS
   ============================================================================ */

/* Hero parallax layers */
.hero__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero__bg-orb {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(74, 103, 65, 0.1) 0%,
    transparent 70%
  );
  will-change: transform;
}

.hero__bg-orb--1 {
  width: 40vw;
  height: 40vw;
  top: -10%;
  left: -10%;
}

.hero__bg-orb--2 {
  width: 30vw;
  height: 30vw;
  bottom: -5%;
  right: -5%;
}

.hero__bg-orb--3 {
  width: 25vw;
  height: 25vw;
  top: 40%;
  right: 20%;
}

/* ============================================================================
   SCROLL INDICATOR - Refined, minimal, cinematic
   ============================================================================ */

.scroll-indicator {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  opacity: 1;
  transition: 
    opacity 0.6s var(--ease-cinematic),
    transform 0.6s var(--ease-cinematic);
}

/* Hide after scrolling with elegant fade */
body:not(.at-top) .scroll-indicator {
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
  pointer-events: none;
}

.scroll-indicator__mouse {
  width: 26px;
  height: 42px;
  border: 2px solid rgba(92, 84, 74, 0.4);
  border-radius: 14px;
  position: relative;
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(4px);
  box-shadow: 
    0 4px 16px rgba(0, 0, 0, 0.08),
    inset 0 0 10px rgba(255, 255, 255, 0.3);
  animation: mouse-breathe 3s ease-in-out infinite;
}

@keyframes mouse-breathe {
  0%, 100% {
    border-color: rgba(92, 84, 74, 0.4);
    transform: scale(1);
  }
  50% {
    border-color: rgba(92, 84, 74, 0.6);
    transform: scale(1.02);
  }
}

.scroll-indicator__mouse::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 10px;
  background: linear-gradient(
    180deg,
    var(--color-ferni, var(--color-ferni)) 0%,
    rgba(74, 103, 65, 0.3) 100%
  );
  border-radius: var(--radius-xs);
  animation: scroll-wheel 2.5s ease-in-out infinite;
}

@keyframes scroll-wheel {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  40% {
    opacity: 0.6;
    transform: translateX(-50%) translateY(10px);
  }
  80% {
    opacity: 0;
    transform: translateX(-50%) translateY(14px);
  }
  81% {
    opacity: 0;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.scroll-indicator__text {
  font-size: var(--text-2xs);
  font-weight: 500;
  color: var(--color-text-secondary, var(--color-text-secondary));
  text-transform: uppercase;
  letter-spacing: 0.15em;
  opacity: 0.7;
  animation: text-pulse 3s ease-in-out infinite;
}

@keyframes text-pulse {
  0%, 100% {
    opacity: 0.5;
  }
  50% {
    opacity: 0.8;
  }
}

/* Arrow indicator (alternative style) */
.scroll-indicator__arrows {
  display: flex;
  flex-direction: column;
  gap: 4px;
  animation: arrows-float 2s ease-in-out infinite;
}

.scroll-indicator__arrows span {
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--color-ferni, var(--color-ferni));
  border-bottom: 2px solid var(--color-ferni, var(--color-ferni));
  transform: rotate(45deg);
  opacity: 0.3;
}

.scroll-indicator__arrows span:nth-child(1) {
  animation: arrow-fade 2s ease-in-out infinite;
}
.scroll-indicator__arrows span:nth-child(2) {
  animation: arrow-fade 2s ease-in-out infinite 0.15s;
}
.scroll-indicator__arrows span:nth-child(3) {
  animation: arrow-fade 2s ease-in-out infinite 0.3s;
}

@keyframes arrow-fade {
  0%, 50%, 100% {
    opacity: 0.2;
    transform: rotate(45deg) translateY(0);
  }
  25% {
    opacity: 0.8;
    transform: rotate(45deg) translateY(4px);
  }
}

@keyframes arrows-float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(6px);
  }
}

/* ============================================================================
   REDUCED MOTION
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
  .cinematic-reveal,
  .reveal-child,
  [data-reveal-child],
  [data-story-stage],
  .scroll-indicator,
  .scroll-indicator__mouse::before {
    transition: none !important;
    animation: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
  
  [data-parallax],
  .hero__bg-orb,
  .hero__content {
    transform: none !important;
  }
}