:root {
  color-scheme: dark light;
  --bg: #0b0d12;
  --fg: #f4f4f5;
  --muted: #9ca3af;
  --accent: #7c3aed;
  --border: #27272a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: radial-gradient(
      1200px 600px at 20% 10%,
      rgba(124, 58, 237, 0.18),
      transparent 60%
    ),
    radial-gradient(
      1000px 500px at 80% 90%,
      rgba(56, 189, 248, 0.12),
      transparent 60%
    ),
    var(--bg);
  color: var(--fg);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.stage {
  width: 100%;
  max-width: 900px;
  text-align: center;
}

.greeting {
  margin: 0 0 32px;
  font-size: 64px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #f4f4f5 0%, #c4b5fd 50%, #7c3aed 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  transition: font-size 120ms ease, font-family 120ms ease, font-weight 120ms ease;
  word-break: break-word;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 20px;
  background: rgba(24, 24, 27, 0.6);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(8px);
}

.control {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
}

.control label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.control select,
.control input[type="range"] {
  font: inherit;
  color: var(--fg);
  background: #18181b;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
  transition: border-color 120ms ease;
}

.control select:focus,
.control input[type="range"]:focus {
  border-color: var(--accent);
}

.size-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.size-row input[type="range"] {
  flex: 1;
  padding: 0;
  height: 36px;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
}

.size-row input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: linear-gradient(90deg, var(--accent), #38bdf8);
  border-radius: 999px;
}

.size-row input[type="range"]::-moz-range-track {
  height: 4px;
  background: linear-gradient(90deg, var(--accent), #38bdf8);
  border-radius: 999px;
}

.size-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -7px;
  background: var(--fg);
  border: 2px solid var(--accent);
  border-radius: 50%;
  cursor: pointer;
}

.size-row input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--fg);
  border: 2px solid var(--accent);
  border-radius: 50%;
  cursor: pointer;
}

#sizeValue {
  min-width: 56px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-size: 14px;
}

.hint {
  margin-top: 20px;
  color: var(--muted);
  font-size: 14px;
}