:root {
  --bg: #05070f;
  --ink: #eaf0ff;
  --dim: #7d88a8;
  --accent: #6ad7ff;
  --accent2: #b06bff;
  --hot: #ff5d73;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: auto; }

body {
  background:
    radial-gradient(120% 90% at 50% 0%, #12203f 0%, #0a1024 38%, var(--bg) 75%),
    var(--bg);
  color: var(--ink);
  font-family: "Space Grotesk", system-ui, sans-serif;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ------- dust / depth backdrop ------- */
#dust {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* ------- the zoom stage ------- */
#stage {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  overflow: hidden;
  perspective: 1200px;
}

/* vignette for depth */
#stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 4;
  background: radial-gradient(120% 120% at 50% 50%, transparent 52%, rgba(2,3,8,.55) 100%);
}

#universe {
  position: relative;
  width: 0;
  height: 0;
}

.layer {
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 0;
  display: grid;
  place-items: center;
  will-change: transform, opacity, filter;
  transform-origin: center center;
}

.scene {
  width: 760px;
  height: 760px;
  max-width: 86vmin;
  max-height: 86vmin;
  transform: translate(-50%, -50%);
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
}

.scene svg { width: 100%; height: 100%; overflow: visible; }

/* ------- HUD shared ------- */
.hud {
  position: fixed;
  z-index: 5;
  pointer-events: none;
  font-family: "JetBrains Mono", monospace;
}

.hud-top {
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px;
  mix-blend-mode: difference;
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 22px; animation: spin 12s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
.wordmark { font-family: "Space Grotesk"; font-weight: 500; letter-spacing: .28em; font-size: 15px; }
.wordmark b { color: var(--accent); font-weight: 700; }
.tag { color: var(--dim); font-size: 12px; letter-spacing: .18em; text-transform: uppercase; }

/* ------- readout (left rail) ------- */
.hud-readout {
  left: 28px;
  top: 50%;
  transform: translateY(-50%);
  width: 210px;
}
.scaleline { display: flex; flex-direction: column; gap: 2px; }
.scaleval {
  font-size: 30px;
  font-weight: 700;
  color: var(--ink);
  font-family: "Space Grotesk";
  letter-spacing: .01em;
  text-shadow: 0 0 24px rgba(106,215,255,.35);
}
.scalename {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .22em;
  color: var(--accent);
}
.depthbar {
  margin: 16px 0 8px;
  width: 4px;
  height: 46vh;
  background: rgba(255,255,255,.08);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
.depthfill {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 0%;
  background: linear-gradient(var(--accent), var(--accent2), var(--hot));
  border-radius: 4px;
  box-shadow: 0 0 14px var(--accent);
}
.powers { color: var(--dim); font-size: 12px; letter-spacing: .1em; }

/* ------- caption (right rail) ------- */
.hud-caption {
  right: 28px;
  top: 50%;
  transform: translateY(-50%);
  width: min(360px, 40vw);
  text-align: right;
}
.hud-caption h2 {
  font-size: clamp(22px, 3.4vw, 40px);
  font-weight: 700;
  font-family: "Space Grotesk";
  line-height: 1.02;
  margin-bottom: 12px;
  transition: opacity .4s;
}
.hud-caption p {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--dim);
  font-family: "JetBrains Mono";
}

/* ------- hint ------- */
.hud-hint {
  bottom: 26px; left: 0; right: 0;
  text-align: center;
  color: var(--dim);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  transition: opacity .5s;
}
.arrow { animation: bob 1.6s ease-in-out infinite; display: inline-block; color: var(--accent); }
@keyframes bob { 0%,100%{transform:translateY(0)} 50%{transform:translateY(4px)} }

/* ------- finale ------- */
.hud-bottom {
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 14px;
  padding: 30px;
  opacity: 0;
  pointer-events: none;
  background: radial-gradient(circle at center, rgba(255,93,115,.10), transparent 60%);
  transition: opacity .6s;
}
.hud-bottom.show { opacity: 1; pointer-events: auto; }
.hud-bottom h2 { font-size: clamp(26px, 5vw, 54px); font-weight: 700; }
.hud-bottom p { color: var(--dim); font-family: "JetBrains Mono"; font-size: 14px; max-width: 480px; margin: 0 auto; line-height: 1.6; }
#restart {
  pointer-events: auto;
  margin-top: 14px;
  justify-self: center;
  font-family: "JetBrains Mono";
  font-size: 13px;
  letter-spacing: .15em;
  color: var(--bg);
  background: var(--accent);
  border: none;
  padding: 12px 22px;
  border-radius: 999px;
  cursor: pointer;
  text-transform: uppercase;
  transition: transform .15s, box-shadow .2s;
  box-shadow: 0 0 28px rgba(106,215,255,.5);
}
#restart:hover { transform: translateY(-2px) scale(1.03); box-shadow: 0 0 40px rgba(106,215,255,.8); }

/* ------- scroll track ------- */
#track { position: relative; z-index: -1; }

/* ------- mobile ------- */
@media (max-width: 720px) {
  .hud-readout { width: 120px; left: 14px; }
  .scaleval { font-size: 22px; }
  .depthbar { height: 38vh; }
  .hud-caption { width: 56vw; right: 14px; }
  .hud-caption p { font-size: 11.5px; }
  .tag { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .logo, .arrow { animation: none; }
}