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

/* --- Default: mobile-first flow layout --- */
body {
  background: #0a0a0a;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

canvas {
  display: block;
  flex: 1;
  width: 100%;
  height: auto;
  min-height: 0;
  touch-action: none;
}

/* --- Controls: stacked panel by default --- */
#controls {
  position: static;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 10px;
  padding: 14px 20px 18px;
  background: rgba(10, 10, 10, 0.92);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.75);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  user-select: none;
}

/* --- Desktop: restore floating pill --- */
@media (min-width: 600px) {
  body {
    display: block;
  }

  canvas {
    width: 100vw;
    height: 100vh;
    flex: none;
  }

  #controls {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: rgba(10, 10, 10, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    white-space: nowrap;
    animation: controlsEnter 300ms cubic-bezier(0.23, 1, 0.32, 1) both;
  }
}

@keyframes controlsEnter {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* --- Shape row --- */
.shape-row {
  display: flex;
  gap: 4px;
  justify-content: center;
}

@media (min-width: 600px) {
  .shape-row {
    justify-content: flex-start;
  }
}

.shape-card {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0 2px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid transparent;
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  cursor: pointer;
  transition: background 150ms ease-out, border-color 150ms ease-out, color 150ms ease-out, transform 100ms ease-out;
}

@media (hover: hover) and (pointer: fine) {
  .shape-card:hover {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.85);
  }
}

.shape-card:active {
  transform: scale(0.95);
}

.shape-card.active {
  border-color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

/* --- Divider --- */
.ctrl-divider {
  width: 100%;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}

@media (min-width: 600px) {
  .ctrl-divider {
    width: 1px;
    height: 32px;
  }
}

/* --- Sliders --- */
.control-group {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
}

@media (min-width: 600px) {
  .control-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }
}

.control-group label {
  color: rgba(255, 255, 255, 0.35);
  font-size: 9px;
  letter-spacing: 0.1em;
  min-width: 56px;
}

@media (min-width: 600px) {
  .control-group label {
    min-width: unset;
  }
}

.control-group-inner {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  width: auto;
  height: 3px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  outline: none;
  display: block;
}

@media (min-width: 600px) {
  input[type="range"] {
    flex: none;
    width: 80px;
  }
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.3);
  transition: transform 100ms ease-out;
}

@media (hover: hover) and (pointer: fine) {
  input[type="range"]::-webkit-slider-thumb {
    width: 13px;
    height: 13px;
  }

  input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
  }
}

input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.1);
}

.value-display {
  color: rgba(255, 255, 255, 0.45);
  font-size: 10px;
  min-width: 18px;
  text-align: right;
  display: inline-block;
}