/* === Reader Settings UI - Modern + Sleek Version === */

/* Toggle Button (⚙️) */
#settings-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    color: var(--fg);
    font-size: 1.2rem;
    padding: 0.4rem;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    z-index: 1001;
    transition: background 0.2s ease, transform 0.2s ease;
  }
  
  #settings-toggle:hover {
    transform: rotate(45deg);
  }
  
  /* Settings Panel Container */
  #reader-settings {
    position: fixed;
    top: 4rem;
    right: 1rem;
    width: 240px;
    padding: 1rem;
    background: var(--bg);
    color: var(--fg);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    font-size: 0.85rem;
    z-index: 1000;
    display: none;
    flex-direction: column;
    gap: 1.25rem;
    max-height: 90vh;
    overflow-y: auto;
    transition: opacity 0.3s ease, transform 0.3s ease;
  }
  
  /* Labels */
  #reader-settings label {
    font-weight: 500;
    margin-bottom: 0.25rem;
    display: block;
    color: var(--muted);
    font-size: 0.8rem;
  }
  
  /* Slider Style */
  #reader-settings input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: var(--hr);
    border-radius: 2px;
    outline: none;
    margin: 0.25rem 0;
    transition: background 0.2s;
  }
  
  #reader-settings input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s;
  }
  #reader-settings input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
  }
  #reader-settings input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    cursor: pointer;
  }
  
  /* Preset Buttons */
  #presets {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.25rem;
    flex-direction: column;
  }
  
  #presets button {
    flex: 1;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.45rem 0.5rem;
    border: none;
    border-radius: 24px;
    background: var(--accent);
    color: var(--bg);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    transition: background 0.2s ease;
  }
  #presets button:hover {
    background: var(--accent) /* a deeper version of accent */
  }
  
  /* Mobile Optimization */
  @media (max-width: 600px) {
    #settings-toggle {
      top: auto;
      bottom: 1rem;
      right: 1rem;
    }
    #reader-settings {
      top: auto;
      bottom: 4rem;
      right: 1rem;
      width: calc(100vw - 2rem);
      padding: 1rem 1.25rem;
    }
  }

  #sliders {
    display: none;
  }