/* Reset and base – no margin/padding so fullscreen canvas has no black frame (Perplexity) */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* Hide SVG filters element */
.svg-filters {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}
html {
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
}
body {
  width: 100%;
  height: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  color: rgba(255, 255, 255, 0.9);
  background: #050810;  /* matches reference image deep water */
}

/* Fullscreen water-colored backdrop – matches reference image dark ocean */
.water-backdrop {
  position: fixed !important;
  left: 0 !important;
  top: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  height: 100dvh !important;
  z-index: 1;
  margin: 0;
  padding: 0;
  pointer-events: none;
  background: #050810;
  background: linear-gradient(
    180deg,
    #151e28 0%,      /* sky - dark blue-gray */
    #1a2530 20%,     /* horizon */
    #0c1018 45%,     /* water surface */
    #080c10 65%,     /* deep water */
    #050810 100%     /* abyss */
  );
}

/* Dream container: no padding so intro can be full viewport */
.dream {
  display: block;
  margin: 0;
  padding: 0;
}

/* Each chapter = full viewport */
.chapter {
  position: relative;
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 2rem;
  scroll-snap-align: start;
  overflow: hidden;
}

/* Intro (first slide): fullscreen fixed; z-index 3 so text/play sit above water bg, below overlay */
.chapter--intro {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  padding: 0;
  margin: 0;
  overflow: hidden;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  z-index: 3;
}

/* A) Water canvases: direct on body, forced fullscreen (no wrapper so no centering) */
.intro-ripples,
.intro-ripples-overlay {
  position: fixed !important;
  left: 0 !important;
  top: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  height: 100dvh !important;
  margin: 0 !important;
  padding: 0 !important;
  border: none;
  outline: none;
  display: block !important;
  pointer-events: none;
  z-index: 2;
  transition: opacity 1.8s ease;
}

.intro-ripples-overlay {
  z-index: 4;
  /* overlay blend creates visible water caustics on text */
  mix-blend-mode: overlay;
  opacity: 0.9;
}

/* (Wrappers removed from HTML – canvases are direct on body) */

/* Gentlerain-style surface: soft gradient + floating blobs */
.intro-surface {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.intro-gradient {
  position: absolute;
  inset: -50%;
  background:
    radial-gradient(ellipse 90% 70% at 20% 30%, rgba(20, 45, 85, 0.5) 0%, transparent 55%),
    radial-gradient(ellipse 80% 60% at 85% 60%, rgba(15, 40, 75, 0.4) 0%, transparent 50%),
    radial-gradient(ellipse 70% 80% at 50% 90%, rgba(10, 30, 60, 0.35) 0%, transparent 45%);
  animation: intro-gradient-shift 18s ease-in-out infinite;
}

@keyframes intro-gradient-shift {
  0%, 100% { transform: scale(1) translate(0, 0) rotate(0deg); opacity: 1; }
  33% { transform: scale(1.05) translate(2%, -1%) rotate(1deg); opacity: 0.95; }
  66% { transform: scale(0.98) translate(-1%, 2%) rotate(-0.5deg); opacity: 1; }
}

.intro-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.2;
  pointer-events: none;
}

.intro-blob--1 {
  width: min(70vw, 420px);
  height: min(70vw, 420px);
  left: -10%;
  top: -15%;
  background: rgba(30, 70, 120, 0.5);
  animation: intro-blob-float 22s ease-in-out infinite;
}

.intro-blob--2 {
  width: min(50vw, 320px);
  height: min(50vw, 320px);
  right: -15%;
  bottom: 10%;
  background: rgba(25, 55, 100, 0.45);
  animation: intro-blob-float 26s ease-in-out infinite 3s;
}

.intro-blob--3 {
  width: min(40vw, 260px);
  height: min(40vw, 260px);
  left: 30%;
  bottom: -10%;
  background: rgba(20, 50, 90, 0.4);
  animation: intro-blob-float 20s ease-in-out infinite 1.5s;
}

@keyframes intro-blob-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(5%, -8%) scale(1.08); }
  50% { transform: translate(-4%, 4%) scale(0.95); }
  75% { transform: translate(3%, 6%) scale(1.02); }
}

.intro-black {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(0, 0, 0, 0.75);
  pointer-events: none;
  transition: opacity 1.8s ease;
}

/* When play is hit: effect and darkness fade so video emerges; no side padding so video fills width */
.chapter--intro.intro--playing {
  padding-left: 0;
  padding-right: 0;
}
/* When video is playing: hide water canvases and backdrop */
body.dream--video-playing .water-backdrop,
body.dream--video-playing .intro-ripples,
body.dream--video-playing .intro-ripples-overlay {
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.8s ease;
}

.chapter--intro.intro--playing .intro-black {
  opacity: 0;
  pointer-events: none;
}

.chapter--intro.intro--playing .intro-content {
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.8s ease;
}

/* Text + play button as cohesive centered unit (best practice: 24-40px gap) */
.intro-content {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;  /* 24px - recommended spacing between text and CTA */
  transition: opacity 1.8s ease;
}

/* Logo link – no underline, inherits logo look */
.intro-logo-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.intro-logo-link:hover,
.intro-logo-link:focus {
  text-decoration: none;
  color: inherit;
}

.intro-logo-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 0.25rem;
}

/* Logo with water distortion effect */
.intro-logo {
  margin: 0;
  font-family: 'EB Garamond', Georgia, serif;
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 500;
  letter-spacing: 0.15em;
  color: rgba(255, 255, 255, 0.95);
  text-transform: uppercase;
  /* Same water distortion as tagline */
  filter: url(#water-distort);
  text-shadow:
    0 2px 0 rgba(0, 0, 0, 0.3),
    0 4px 16px rgba(0, 0, 0, 0.4),
    0 0 20px rgba(255, 255, 255, 0.35),
    0 0 40px rgba(255, 255, 255, 0.2);
}

.intro-text-wrapper {
  visibility: visible;
  padding: 0.4em;
  overflow: visible;
}

/* Text with water distortion filter and glow */
.intro-text {
  margin: 0;
  font-family: 'EB Garamond', Georgia, serif;
  font-size: clamp(1rem, 3vw, 1.4rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.95);
  text-align: center;
  max-width: 90vw;
  opacity: 1;
  transition: opacity 2.8s ease;
  /* Water distortion effect - text ripples like underwater */
  filter: url(#water-distort);
  /* Multi-layer text-shadow for glow on dark background */
  text-shadow:
    0 2px 0 rgba(0, 0, 0, 0.3),
    0 4px 12px rgba(0, 0, 0, 0.4),
    0 0 12px rgba(255, 255, 255, 0.4),
    0 0 24px rgba(255, 255, 255, 0.25),
    0 0 40px rgba(255, 255, 255, 0.15);
}

.intro-text::first-line {
  font-size: 1.18em;
}

.intro-text.intro-text--hidden {
  opacity: 0;
  pointer-events: none;
}

.intro-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  min-width: 100%;
  min-height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 1;
  opacity: 0;
  transition: opacity 1.8s ease;
  pointer-events: none;
}

.intro-video.intro-video--visible {
  opacity: 1;
  z-index: 2;
}

.intro-audio {
  display: none;
}

/* Controls on video screen: pause/play and audio toggle */
.intro-controls {
  position: absolute;
  bottom: max(1.5rem, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  max-width: min(96vw, 36rem);
  padding: 0 0.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.chapter--intro.intro--playing .intro-controls {
  opacity: 1;
  pointer-events: auto;
}

.intro-controls[hidden] {
  display: none !important;
}

.intro-control-btn {
  padding: 0.65rem 1rem;
  min-height: 44px;
  font-family: inherit;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.95);
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
  touch-action: manipulation;
}

.intro-control-btn:hover {
  background: rgba(0, 0, 0, 0.55);
  border-color: rgba(255, 255, 255, 0.5);
}
.intro-control-btn:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 2px;
}

.intro-control-volume-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.intro-volume-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
}

.intro-control-volume {
  width: 5rem;
  height: 0.5rem;
  accent-color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
}

.intro-fullscreen-btn {
  flex-shrink: 0;
}

/* Play button: cohesive with text, gentle visual cue (calm aesthetic) */
/* Best practice: button feels like gentle nudge, not aggressive CTA */
.intro-play-btn {
  width: 3.5rem;
  height: 3.5rem;
  min-width: 3.5rem;
  min-height: 3.5rem;
  margin: 0;  /* spacing handled by parent gap */
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(4px);
  cursor: pointer;
  position: relative;
  z-index: 4;
  color: rgba(255, 255, 255, 0.9);
  /* Flexbox to center the triangle */
  display: flex;
  align-items: center;
  justify-content: center;
  /* Breathing animation - slow like calm breathing */
  animation: play-btn-breathe 4s ease-in-out infinite;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3))
          drop-shadow(0 0 16px rgba(255, 255, 255, 0.15));
}

/* Breathing/pulsating animation */
@keyframes play-btn-breathe {
  0%, 100% {
    transform: scale(1);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
  }
  50% {
    transform: scale(1.08);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 20px 4px rgba(255, 255, 255, 0.1);
  }
}

.intro-play-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.35);
  /* Pause breathing on hover, scale up slightly */
  animation-play-state: paused;
  transform: scale(1.12);
}

.intro-play-btn::before {
  content: "";
  display: block;
  width: 0;
  height: 0;
  /* Optical centering: triangle points right, so shift slightly right */
  margin-left: 0.2rem;
  border-style: solid;
  border-width: 0.5rem 0 0.5rem 0.8rem;
  border-color: transparent transparent transparent currentColor;
}
.intro-play-btn:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 4px;
}
.intro-play-btn:disabled,
.intro-play-btn.intro-play-btn--played {
  cursor: default;
}

/* Debug panel: press D to toggle */
.debug-panel {
  position: fixed;
  bottom: 0.5rem;
  left: 0.5rem;
  right: 0.5rem;
  max-height: 40vh;
  overflow: auto;
  z-index: 9999;
  font-family: ui-monospace, monospace;
  font-size: 11px;
  line-height: 1.35;
  color: #e0e0e0;
  background: rgba(0, 0, 0, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  padding: 0.5rem 0.75rem;
  white-space: pre-wrap;
  word-break: break-all;
  pointer-events: auto;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.debug-panel--hidden {
  opacity: 0;
  transform: translateY(0.5rem);
  pointer-events: none;
}
.debug-panel .debug-section {
  margin-bottom: 0.5rem;
}
.debug-panel .debug-section:last-child {
  margin-bottom: 0;
}
.debug-panel .debug-label {
  color: #8af;
  font-weight: 600;
}
.debug-panel .debug-warn {
  color: #fa8;
}
.debug-panel .debug-ok {
  color: #8f8;
}

.dream-back-link {
  position: fixed;
  top: max(12px, env(safe-area-inset-top));
  left: max(12px, env(safe-area-inset-left));
  z-index: 30;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(6px);
  touch-action: manipulation;
}

.dream-back-link:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}

@media (max-width: 640px) {
  .intro-play-btn {
    width: 3.75rem;
    height: 3.75rem;
    min-width: 3.75rem;
    min-height: 3.75rem;
  }

  .intro-control-volume-wrap {
    flex: 1 1 100%;
    justify-content: center;
  }

  .intro-control-volume {
    width: min(10rem, 50vw);
  }

  .intro-fullscreen-btn {
    /* Fullscreen is unreliable on many phones — keep available but not primary. */
    order: 4;
  }

  .intro-blob {
    filter: blur(48px);
    opacity: 0.16;
  }

  .intro-logo,
  .intro-text {
    /* Cheaper than animated SVG displacement on mobile GPUs */
    filter: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .intro-gradient,
  .intro-blob,
  .intro-play-btn {
    animation: none !important;
  }
}