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/* =========================================================================
   scene.css — the 6-layer parallax cloudscape
   .scene is fixed behind content; each .layer translates on scroll + mouse.
   Depths (back → front):
     0  sky          (static gradient, lives on body)
     1  far clouds   (data-speed slow)
     2  moon         (fades in on scroll)
     3  mid clouds   (data-speed medium)
     3  whale        (owned by whale.js — scroll-mapped)
     4  bubbles      (data-speed fast, ambient rise)
     5  content      (normal document flow, z-index 1)
   ========================================================================= */

.scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;                /* never block content clicks    */
  overflow: hidden;
  transform: translateZ(0);
  will-change: transform;
  /* NO gradient here anymore. The sky now lives ONLY on <body> (see
     base.css). Having two gradients — a fixed .scene one AND a scrolling
     body one — caused the strip: they're identical at the top of the
     page but diverge as you scroll (fixed stays locked, body shifts to
     peach), so any momentary gap in .scene revealed a MISMATCHED body
     colour = a visible band. One sky on <body> (which scrolls with the
     content and cannot gap) eliminates the mismatch entirely. .scene is
     now just a transparent holder for the parallax clouds/moon. */
  background: transparent;
}

.layer {
  position: absolute;
  inset: 0;
  will-change: transform;              /* promote to its own GPU layer  */
}

/* Top layers float ABOVE the content. They are children of <body>, not
   .scene, so they escape the scene's stacking context (z-index 0) and
   render above <main> (z-index 1). Whale = 2, bubbles = 3 (above all). */
.layer-top {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  overflow: hidden;
  will-change: transform;
}
.layer-top.layer-bubbles { z-index: 3; }      /* bubbles above the whale    */

/* Each layer seeded taller than the viewport so parallax never reveals
   an empty edge. The JS reads data-speed and data-mouse to translate. */
.layer-far-clouds  { height: 200%; top: -50%; }
.layer-moon        { height: 160%; top: -30%; }
.layer-mid-clouds  { height: 180%; top: -40%; }


/* --- Far clouds (layer 1) --------------------------------------------- */
.cloud-far {
  position: absolute;
  width: 340px;
  opacity: 0.5;
  filter: blur(6px);
  color: var(--cloud);                 /* SVG fill uses currentColor     */
}
.cloud-far.c1 { top: 12%;  left: 8%;  }
.cloud-far.c2 { top: 6%;   left: 62%; transform: scale(1.3); }
.cloud-far.c3 { top: 38%;  left: 78%; transform: scale(0.85); }
.cloud-far.c4 { top: 24%;  left: 40%; transform: scale(1.1); opacity: 0.4; }

/* slow horizontal drift */
@keyframes drift-far {
  0%, 100% { transform: translateX(0) scale(var(--s, 1)); }
  50%      { transform: translateX(40px) scale(var(--s, 1)); }
}
.cloud-far { animation: drift-far 18s var(--ease-gentle) infinite; }
.cloud-far.c2 { --s: 1.3; animation-duration: 24s; }
.cloud-far.c3 { --s: 0.85; animation-duration: 20s; animation-delay: -6s; }
.cloud-far.c4 { --s: 1.1; animation-duration: 22s; animation-delay: -10s; }


/* --- Moon (layer 2) --------------------------------------------------- */
/* A dreamy crescent moon: no glow, a translucent body. The crescent is
   carved with a CSS mask for the clean silhouette. */
.moon {
  position: absolute;
  top: 8%;
  right: 9%;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  opacity: 0;                         /* fades in as user scrolls        */
  transition: opacity 1.2s var(--ease-soft);
}
.moon.is-visible { opacity: 0.9; }

.moon-disc {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  /* warm translucent body — a bit less see-through than before          */
  background: radial-gradient(circle at 34% 30%,
              rgba(255, 251, 234, 0.78) 0%,
              rgba(255, 233, 77, 0.66) 50%,
              rgba(245, 178, 46, 0.58) 100%);
  /* crescent flipped top↔bottom: bite now sits upper-left, opening down   */
  -webkit-mask: radial-gradient(circle 50px at 30% 28%, transparent 96%, #000 100%);
          mask: radial-gradient(circle 50px at 30% 28%, transparent 96%, #000 100%);
}


/* --- Mid clouds (layer 3) --------------------------------------------- */
.cloud-mid {
  position: absolute;
  width: 260px;
  opacity: 0.78;
  filter: blur(2px);
  color: var(--cloud);
}
.cloud-mid.m1 { top: 22%; left: -10%;  animation: drift-mid 38s linear infinite; }
.cloud-mid.m2 { top: 58%; left: 70%;   animation: drift-mid 52s linear infinite; animation-delay: -18s; }
.cloud-mid.m3 { top: 44%; left: 30%;   animation: drift-mid 46s linear infinite; animation-delay: -30s; transform: scale(0.7); }

@keyframes drift-mid {
  from { transform: translateX(-30vw); }
  to   { transform: translateX(130vw); }
}


/* --- Bubbles (layer 4) ------------------------------------------------ */
.bubbles {
  /* container; individual bubbles injected by main.js */
}

.bubble {
  position: absolute;
  bottom: -110px;                        /* start further down (bigger now) */
  border-radius: 50%;
  /* glass body: mostly transparent, faint wash toward the light source    */
  background: radial-gradient(circle at 30% 28%,
              rgba(255, 255, 255, 0.5) 0%,
              rgba(255, 255, 255, 0.12) 42%,
              rgba(255, 143, 171, 0.06) 72%,
              rgba(255, 143, 171, 0.02) 100%);
  /* the bright soap-film rim + inner spherical depth                      */
  border: 1px solid rgba(255, 255, 255, 0.42);
  box-shadow:
    inset -5px -7px 12px rgba(157, 170, 242, 0.22),     /* bottom-inner shade */
    inset 4px 5px 10px rgba(255, 255, 255, 0.45),       /* top-inner glow    */
    0 2px 10px rgba(157, 170, 242, 0.1);                /* soft contact shadow*/
  animation: rise linear infinite;
  will-change: transform, opacity;
}

/* the crisp glassy highlight on each bubble */
.bubble::after {
  content: "";
  position: absolute;
  top: 15%;
  left: 19%;
  width: 32%;
  height: 32%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.25) 55%, transparent 75%);
}

@keyframes rise {
  0%   { transform: translate(0, 0)               rotate(0deg);   opacity: 0; }
  8%   { opacity: 0.75; }
  92%  { opacity: 0.75; }
  100% { transform: translate(var(--sway, 24px), -115vh) rotate(var(--spin, 40deg)); opacity: 0; }
}

/* --- Content sits above the whole scene --- */
main {
  position: relative;
  z-index: 1;
}