@layer base {
  html { scroll-behavior: smooth; }
  details > summary::-webkit-details-marker { display: none; }
  details > summary { list-style: none; }
  input[type="range"] {
    height: 22px;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    cursor: pointer;
  }
  input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    background: linear-gradient(to right, #4F46E5 0%, #4F46E5 var(--val,85%), #E2E8F0 var(--val,85%), #E2E8F0 100%);
    border-radius: 9999px;
  }
  input[type="range"]::-moz-range-track {
    height: 6px;
    background: #E2E8F0;
    border-radius: 9999px;
  }
  input[type="range"]::-moz-range-progress {
    height: 6px;
    background: #4F46E5;
    border-radius: 9999px;
  }
  input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: 18px;
    width: 18px;
    border-radius: 9999px;
    background: #fff;
    border: 3px solid #4F46E5;
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.35);
    margin-top: -6px;
    transition: transform 0.12s ease;
  }
  input[type="range"]:hover::-webkit-slider-thumb {
    transform: scale(1.08);
  }
  input[type="range"]::-moz-range-thumb {
    height: 18px;
    width: 18px;
    border-radius: 9999px;
    background: #fff;
    border: 3px solid #4F46E5;
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.35);
  }
}
.progress-bar {
  height: 8px;
  background: #E2E8F0;
  border-radius: 9999px;
  overflow: hidden;
}
.progress-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #4F46E5, #6366F1);
  border-radius: 9999px;
  transition: width 0.2s ease;
}
.fade-in { animation: fadeIn 0.25s ease both; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.45);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }