:root {
  --bg: #061018;
  --ink: #f7fbff;
  --cyan: #6ee7ff;
  --blue: #2986ff;
  --progress: 0;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
}

body {
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 58% 42%, rgba(110, 231, 255, 0.12), transparent 34rem),
    linear-gradient(180deg, #061018 0%, #071821 48%, #03070a 100%);
  font-family: "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

.site {
  min-height: 720svh;
}

#scene {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
}

.sky-glow {
  position: fixed;
  inset: -18%;
  z-index: 2;
  pointer-events: none;
  opacity: 0.34;
  background:
    radial-gradient(circle at calc(62% - var(--progress) * 24%) calc(28% + var(--progress) * 20%), rgba(125, 231, 255, 0.22), transparent 26rem),
    radial-gradient(circle at 30% 78%, rgba(23, 125, 174, 0.12), transparent 22rem);
  filter: blur(44px);
  mix-blend-mode: screen;
}

.grain {
  display: none;
}

.brand {
  position: fixed;
  left: clamp(1.1rem, 5vw, 4.5rem);
  top: clamp(1.2rem, 5.5svh, 4.2rem);
  z-index: 6;
  margin: 0;
  color: var(--ink);
  font-size: 7.8rem;
  font-weight: 650;
  letter-spacing: 0;
  line-height: 0.82;
  pointer-events: none;
  text-shadow:
    0 0 40px rgba(110, 231, 255, 0.18),
    0 0 88px rgba(41, 134, 255, 0.12);
  transform: translateY(calc(var(--progress) * -1.4rem));
}

.progress {
  position: fixed;
  right: clamp(0.8rem, 2vw, 1.35rem);
  top: 50%;
  z-index: 6;
  width: 1px;
  height: min(34svh, 16rem);
  transform: translateY(-50%);
  background: rgba(247, 251, 255, 0.14);
  pointer-events: none;
}

.progress span {
  position: absolute;
  inset: 0 0 auto;
  height: calc(var(--progress) * 100%);
  background: linear-gradient(180deg, #7df2ff, #2986ff);
  box-shadow: 0 0 24px rgba(110, 231, 255, 0.5);
}

.scroll-space {
  height: 720svh;
}

.fallback-scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 55% 58%, rgba(27, 146, 180, 0.55), transparent 28rem),
    linear-gradient(180deg, #0b2331, #041018);
}

.fallback-island {
  position: absolute;
  left: 50%;
  top: 58%;
  width: min(86vw, 58rem);
  aspect-ratio: 1.2;
  border-radius: 48% 44% 42% 52%;
  transform:
    translate(-50%, -50%)
    perspective(900px)
    rotateX(62deg)
    rotateZ(calc(-22deg + var(--progress) * 54deg))
    scale(calc(0.86 + var(--progress) * 0.45));
  background:
    radial-gradient(circle at 62% 64%, rgba(245, 235, 170, 0.92), transparent 16%),
    radial-gradient(circle at 48% 46%, rgba(30, 108, 52, 0.95), rgba(32, 86, 48, 0.85) 44%, rgba(238, 210, 138, 0.92) 58%, transparent 63%),
    radial-gradient(circle at 50% 50%, rgba(49, 205, 210, 0.75), transparent 68%);
  box-shadow: 0 42px 130px rgba(0, 0, 0, 0.62), 0 0 80px rgba(110, 231, 255, 0.18);
}

.fallback-route {
  position: absolute;
  left: 27%;
  top: 55%;
  width: 44%;
  height: 18%;
  border-top: 0.28rem solid rgba(110, 231, 255, 0.9);
  border-right: 0.28rem solid rgba(110, 231, 255, 0.7);
  border-radius: 50%;
  transform: rotate(-17deg) scale(calc(0.75 + var(--progress) * 0.42));
  filter: drop-shadow(0 0 18px rgba(110, 231, 255, 0.8));
}

.fallback-dot {
  position: absolute;
  left: 60%;
  top: 57%;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: var(--blue);
  border: 3px solid rgba(245, 251, 255, 0.9);
  box-shadow: 0 0 28px rgba(41, 134, 255, 0.9);
  transform: translate(-50%, -50%) scale(calc(0.9 + var(--progress) * 1.8));
}

body.has-webgl .fallback-scene {
  display: none;
}

@media (max-width: 720px) {
  .site,
  .scroll-space {
    min-height: 680svh;
    height: 680svh;
  }

  .brand {
    left: 1.1rem;
    top: max(2.15rem, calc(env(safe-area-inset-top) + 1.2rem));
    font-size: 4.5rem;
  }

  .progress {
    right: 0.65rem;
    height: 24svh;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site,
  .scroll-space {
    min-height: 100svh;
    height: 100svh;
  }

  .progress {
    display: none;
  }
}