:root {
  color-scheme: dark;
  --bg: #07111a;
  --bg-accent: #102739;
  --panel: rgba(7, 17, 26, 0.82);
  --panel-edge: rgba(131, 227, 255, 0.18);
  --grid-line: rgba(131, 227, 255, 0.08);
  --text: #ecf8ff;
  --muted: rgba(236, 248, 255, 0.72);
  --neutral-stroke: #d6f3ff;
  --neutral-glow: rgba(214, 243, 255, 0.3);
  --cw-stroke: #ff5b6e;
  --cw-glow: rgba(255, 91, 110, 0.38);
  --ccw-stroke: #5bbcff;
  --ccw-glow: rgba(91, 188, 255, 0.38);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(96, 212, 255, 0.18), transparent 30%),
    linear-gradient(180deg, #0d2231 0%, var(--bg) 50%, #02070b 100%);
}

.page {
  min-height: 100vh;
  display: grid;
  gap: 2rem;
  align-content: center;
  padding: clamp(1.25rem, 3vw, 3rem);
}

.hero {
  width: min(68rem, 100%);
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.8rem);
  line-height: 0.94;
}

.lede {
  width: min(46rem, 100%);
  margin: 1rem auto 0;
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.5;
  color: var(--muted);
}

.display-shell {
  width: min(84rem, 100%);
  margin: 0 auto;
  padding: clamp(0.85rem, 2vw, 1.25rem);
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--panel-edge);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(131, 227, 255, 0.06), transparent 30%),
    var(--panel);
  box-shadow:
    0 20px 48px rgba(0, 0, 0, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.display {
  display: block;
  width: 100%;
  height: auto;
}

.display-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: end;
  margin-top: 1rem;
  padding: 1rem 0.35rem 0.15rem;
}

.control-group {
  display: grid;
  gap: 0.65rem;
}

.control-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
}

#resolution-slider,
#speed-slider {
  width: 100%;
  margin: 0;
}

#resolution-slider {
  accent-color: var(--ccw-stroke);
}

#speed-slider {
  accent-color: var(--cw-stroke);
}

.control-note {
  font-size: 0.9rem;
  color: var(--muted);
}

.control-toggle {
  justify-items: start;
}

.control-actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-end;
  padding-top: 0.25rem;
}

.control-button {
  min-height: 2.7rem;
  padding: 0.72rem 1rem;
  border: 1px solid rgba(214, 243, 255, 0.12);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03)),
    rgba(6, 14, 22, 0.8);
  color: var(--text);
  font: inherit;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    border-color 160ms ease,
    transform 160ms ease,
    background 160ms ease;
}

.control-button:hover {
  border-color: rgba(214, 243, 255, 0.28);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.04)),
    rgba(6, 14, 22, 0.86);
}

.control-button:active {
  transform: translateY(1px);
}

#color-hints-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-pill {
  position: relative;
  display: inline-flex;
  width: 4rem;
  height: 2.1rem;
  padding: 0.2rem;
  border: 1px solid rgba(214, 243, 255, 0.14);
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(91, 188, 255, 0.22), rgba(255, 91, 110, 0.18)),
    rgba(255, 255, 255, 0.04);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transition: background 160ms ease, border-color 160ms ease;
}

.toggle-knob {
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  background: #f4fbff;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.28);
  transition: transform 160ms ease;
}

#color-hints-toggle:checked + .toggle-pill .toggle-knob {
  transform: translateX(1.8rem);
}

#color-hints-toggle:not(:checked) + .toggle-pill {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(214, 243, 255, 0.1);
}

@media (max-width: 720px) {
  .page {
    align-content: start;
    padding-top: 1.5rem;
  }

  .display-shell {
    border-radius: 20px;
  }

  .display-controls {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .control-label {
    gap: 0.75rem;
  }

  .control-actions {
    justify-content: stretch;
  }

  .control-button {
    width: 100%;
  }
}