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


body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #252b39 0, #05060a 55%, #020308 100%);
  color: #f3f5ff;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  gap: 10px;
}

.ui {
  width: 900px;
  max-width: 100%;
  padding: 10px 14px 14px;
  background: linear-gradient(145deg, #181c25, #10131b);
  border-radius: 16px;
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.85),
    0 0 0 1px rgba(255, 255, 255, 0.03);
}


.ui h1 {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}


.stats span,
#densityValue {
  font-family: "IBM Plex Mono", ui-monospace, SFMonoRegular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Controls and stats text */
.controls label,
.mode-button,
.stats,
.phase-button {
  font-family: "Inter", system-ui, sans-serif;
}



.controls {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 10px;
}

.controls label {
  font-size: 13px;
  color: #d5dbff;
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 6px;
}


#densityValue {
  font-size: 13px;
}

/* -------- Slider -------- */

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 24px;
  cursor: pointer;
  background: transparent;
}



input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(79, 156, 255, 0.7), rgba(61, 214, 255, 0.8)) 0 0 / var(--fill, 0%) 100% no-repeat,
    linear-gradient(90deg, #202634, #171b24);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.04),
    0 3px 8px rgba(0, 0, 0, 0.6);
}

input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(79, 156, 255, 0.7), rgba(61, 214, 255, 0.8)) 0 0 / var(--fill, 0%) 100% no-repeat,
    linear-gradient(90deg, #202634, #171b24);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.04),
    0 3px 8px rgba(0, 0, 0, 0.6);
}



input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -6px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 25%, #ffffff, #e5f0ff 32%, #4f9cff 80%);
  box-shadow:
    0 0 0 2px #10131b,
    0 0 0 1px rgba(255, 255, 255, 0.4),
    0 0 18px rgba(79, 156, 255, 0.9);
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 25%, #ffffff, #e5f0ff 32%, #4f9cff 80%);
  box-shadow:
    0 0 0 2px #10131b,
    0 0 0 1px rgba(255, 255, 255, 0.4),
    0 0 18px rgba(79, 156, 255, 0.9);
  border: none;
}



input[type="range"]:focus-visible {
  outline: none;
}

input[type="range"]:active::-webkit-slider-thumb,
input[type="range"]:active::-moz-range-thumb {
  box-shadow:
    0 0 0 2px #05070c,
    0 0 0 1px rgba(255, 255, 255, 0.5),
    0 0 26px rgba(61, 214, 255, 1);
  transform: scale(1.02);
}



.light-controls {
  margin-bottom: 8px;
  margin-top: 4px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  justify-content: space-between;
}

.light-controls-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  opacity: 0.9;
}

.mode-toggle {
  display: inline-flex;
  padding: 2px;
  border-radius: 999px;
  background: radial-gradient(circle at top left, #2e3645, #141820);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.04),
    0 8px 18px rgba(0, 0, 0, 0.7);
}

.mode-button {
  border: none;
  padding: 5px 12px;
  font-size: 12px;
  color: #c3c7d9;
  background: transparent;
  border-radius: 999px;
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    transform 0.08s ease,
    box-shadow 0.15s ease;
}

.mode-button.active {
  background: linear-gradient(135deg, #4f9cff, #3dd6ff);
  color: #05060b;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.6);
  transform: translateY(-1px);
}

.phase-buttons {
  display: flex;
  gap: 6px;
}

.phase-button {
  border: none;
  padding: 5px 10px;
  font-size: 11px;
  border-radius: 7px;
  cursor: pointer;
  background: #242a39;
  color: #d7dbed;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.7);
  transition:
    background 0.15s ease,
    transform 0.05s ease,
    box-shadow 0.15s ease;
}

.phase-button:hover {
  background: #2f3648;
  transform: translateY(-1px);
}

.phase-button:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.7);
}

/* Stats */

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  opacity: 0.9;
  margin-top: 4px;
}

#simCanvas {
  border-radius: 16px;
  background: radial-gradient(circle at top, #191d28 0, #05070c 60%, #020308 100%);
  box-shadow:
    0 20px 42px rgba(0, 0, 0, 0.95),
    0 0 0 1px rgba(255, 255, 255, 0.03);
}

.credits {
  margin-top: 6px;
  font-size: 11px;
  opacity: 0.75;
  text-align: right;
  color: #c5cae9;
}