:root{
  --bg: #ffffff;
  --ink: #0f172a;      
  --muted: #475569;    
  --border: #e5e7eb;  
  --panel: #ffffff;
  --accent: #2563eb;   
  --accent-2: #10b981; 
}

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.45 Inter, ui-sans-serif, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  appearance: none;
  border: 0;
  padding: 8px 12px;
  border-radius: 10px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
}
button + button { margin-left: 10px; }
button[data-variant="success"] { background: var(--accent-2); }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 260px; background: transparent;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px; background: var(--border); border-radius: 999px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  margin-top: -6px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--ink); border: 2px solid #fff;
  box-shadow: 0 0 0 1px #d1d5db inset; /* gray-300 */
}
input[type="range"]::-moz-range-track {
  height: 6px; background: var(--border); border-radius: 999px;
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--ink); border: 2px solid #fff;
}

span.label {
  display: inline-block;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 6px;
}