:root {
  --bg: #06070b;
  --surface: rgba(12, 15, 20, 0.82);
  --surface-strong: rgba(17, 21, 28, 0.92);
  --border: rgba(225, 235, 247, 0.18);
  --text: #f7fbff;
  --muted: #aab5c2;
  --cyan: #5ce1ff;
  --green: #73f2a6;
  --amber: #ffd166;
  --rose: #ff6b9d;
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.42);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 38%),
    radial-gradient(circle at 18% 16%, rgba(92, 225, 255, 0.18), transparent 31%),
    radial-gradient(circle at 82% 24%, rgba(255, 209, 102, 0.13), transparent 30%),
    radial-gradient(circle at 50% 100%, rgba(115, 242, 166, 0.13), transparent 40%),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.experiment {
  position: fixed;
  inset: 0;
  min-width: 320px;
  isolation: isolate;
}

canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.controls {
  position: fixed;
  z-index: 2;
  top: 16px;
  left: 16px;
  width: min(336px, calc(100vw - 32px));
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
  text-transform: uppercase;
}

.back-link:hover {
  color: var(--green);
}

.control {
  display: grid;
  gap: 8px;
  margin-top: 13px;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 18px;
  font-size: 13px;
  font-weight: 750;
}

output {
  min-width: 58px;
  color: var(--amber);
  font-family: var(--mono);
  font-size: 12px;
  text-align: right;
}

input[type="range"] {
  width: 100%;
  margin: 0;
  accent-color: var(--rose);
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 15px;
}

button {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.075);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  font-weight: 750;
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, transform 140ms ease;
}

button:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.28);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

button.primary {
  color: #061018;
  border-color: rgba(92, 225, 255, 0.72);
  background: linear-gradient(135deg, var(--cyan), var(--green));
}

.readout {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 36px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
  color: var(--muted);
  box-shadow: var(--shadow);
  font-size: 12px;
  backdrop-filter: blur(14px);
}

.readout strong {
  color: var(--green);
  font-family: var(--mono);
  font-size: 13px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(92, 225, 255, 0.35);
  outline-offset: 2px;
}

@media (max-width: 760px) {
  .controls {
    top: 10px;
    left: 10px;
    width: min(314px, calc(100vw - 20px));
    padding: 12px;
  }

  .control {
    margin-top: 10px;
  }

  .button-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  button {
    height: 36px;
    padding: 0 6px;
    font-size: 12px;
  }

  .readout {
    right: 10px;
    bottom: 10px;
  }
}

@media (max-height: 640px) {
  .controls {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .control,
  .button-grid {
    margin-top: 0;
    margin-bottom: 0;
  }
}