/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  width: 320px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: #2d3748;
  background-color: #f7f8fa;
}

/* ===== Screen-reader only ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ===== Popup Container ===== */
.popup-container {
  padding: 20px;
}

/* ===== Header ===== */
.popup-header {
  text-align: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid #e2e8f0;
}

.popup-header h1 {
  font-size: 20px;
  font-weight: 700;
  color: #1a202c;
  letter-spacing: -0.01em;
}

.popup-header .subtitle {
  font-size: 12px;
  color: #718096;
  margin-top: 4px;
}

/* ===== Feature Group ===== */
.feature-group {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===== Feature Toggle Row ===== */
.feature-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  transition: border-color 0.15s ease;
}

.feature-toggle:hover {
  border-color: #a0aec0;
}

.feature-info {
  flex: 1;
  min-width: 0;
}

.feature-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #1a202c;
  cursor: pointer;
}

.feature-desc {
  font-size: 11px;
  color: #718096;
  margin-top: 2px;
  line-height: 1.4;
}

/* ===== Toggle Switch ===== */
.toggle-switch {
  position: relative;
  flex-shrink: 0;
  width: 44px;
  height: 24px;
}

.toggle-switch input[type="checkbox"] {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
  margin: 0;
}

.toggle-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 24px;
  background-color: #cbd5e0;
  border-radius: 12px;
  transition: background-color 0.2s ease;
  pointer-events: none;
}

.toggle-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background-color: #ffffff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease;
}

/* Checked state */
.toggle-switch input[type="checkbox"]:checked + .toggle-track {
  background-color: #6b8aad;
}

.toggle-switch input[type="checkbox"]:checked + .toggle-track::after {
  transform: translateX(20px);
}

/* Focus state */
.toggle-switch input[type="checkbox"]:focus-visible + .toggle-track {
  outline: 2px solid #4a7ab5;
  outline-offset: 2px;
}

/* ===== Color intensity slider (Mute Colors) ===== */
.slider-group {
  padding: 12px 14px 14px;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
}

.slider-group .feature-desc {
  margin-bottom: 8px;
}

.slider-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 6px;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-row input[type="range"] {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: #e2e8f0;
  border-radius: 3px;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #6b8aad;
  cursor: pointer;
  border: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.slider-row input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #6b8aad;
  cursor: pointer;
  border: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.slider-value {
  font-size: 14px;
  font-weight: 600;
  color: #4a5568;
  min-width: 28px;
  text-align: right;
}

/* ===== Footer ===== */
.popup-footer {
  margin-top: 20px;
  padding-top: 12px;
  border-top: 1px solid #e2e8f0;
  text-align: center;
}

.popup-footer p {
  font-size: 11px;
  color: #a0aec0;
  font-style: italic;
}