body {
       --c-glass: #bbbbbc;
       --c-light: #fff;
       --c-dark: #000;

       --c-content: #224;
       --c-action: #0052f5;

       --c-bg: #E8E8E9;

       --glass-reflex-dark: 1;
       --glass-reflex-light: 1;

       --saturation: 150%;

       font-optical-sizing: auto;
       background: var(--c-bg);
       color: var(--c-content);

       transition: background 400ms cubic-bezier(1, 0.0, 0.4, 1), color 400ms cubic-bezier(1, 0.0, 0.4, 1);

       overscroll-behavior: contain;
       /* جلوگیری از Pull-to-Refresh */
       touch-action: none;
       /* غیرفعال کردن رفتار پیش‌فرض تا خودمان کنترل کنیم */

   }

   .switcher {
       direction: ltr;
       position: fixed;
       z-index: 5;
       left: 50%;
       translate: -50%;
       display: flex;
       align-items: center;
       gap: 8px;
       height: 70px;
       box-sizing: border-box;
       padding: 8px 12px 10px;
       margin: 0 auto;
       border: none;
       border-radius: 99em;
       font-size: var(--fz);
       background-color: color-mix(in srgb, var(--c-glass) 12%, transparent);
       backdrop-filter: blur(8px) url(#switcher) saturate(var(--saturation));
       -webkit-backdrop-filter: blur(8px) saturate(var(--saturation));
       box-shadow:
           inset 0 0 0 1px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 10%), transparent),
           inset 1.8px 3px 0px -2px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 20%), transparent),
           inset -2px -2px 0px -2px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 0%), transparent),
           inset -3px -8px 1px -6px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 0%), transparent),
           inset -0.3px -1px 4px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 12%), transparent),
           inset -1.5px 2.5px 0px -2px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 20%), transparent),
           inset 0px 3px 4px -2px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 20%), transparent),
           inset 2px -6.5px 1px -4px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 10%), transparent),
           0px 1px 5px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 10%), transparent),
           0px 6px 16px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 8%), transparent);
       transition:
           background-color 400ms cubic-bezier(1, 0.0, 0.4, 1),
           box-shadow 400ms cubic-bezier(1, 0.0, 0.4, 1);
   }

   .switcher__legend {
       position: absolute;
       width: 1px;
       height: 1px;
       margin: -1px;
       border: 0;
       padding: 0;
       white-space: nowrap;
       clip-path: inset(100%);
       clip: rect(0 0 0 0);
       overflow: hidden;
   }

   .switcher__input {
       clip: rect(0 0 0 0);
       clip-path: inset(100%);
       height: 1px;
       width: 1px;
       overflow: hidden;
       position: absolute;
       white-space: nowrap;
   }

   .switcher__icon {
       display: block;
       width: 100%;
       transition: scale 200ms cubic-bezier(0.5, 0, 0, 1);
   }

   .switcher__filter {
       position: absolute;
       width: 0;
       height: 0;
       z-index: -1;
   }

   .switcher__option {
       --c: var(--c-content);
       display: flex;
       justify-content: center;
       align-items: center;
       padding: 0 16px;
       width: 68px;
       height: 100%;
       box-sizing: border-box;
       border-radius: 99em;
       opacity: 1;
       transition: all 160ms;
   }

   .switcher__option:hover {
       --c: var(--c-action);
       cursor: pointer;
   }

   .switcher__option:hover .switcher__icon {
       scale: 1.2;
   }

   .switcher__option:has(input:checked) {
       --c: var(--c-content);
       cursor: auto;
   }

   .switcher__option:has(input:checked) .switcher__icon {
       scale: 1;
   }

   .switcher::after {
       content: '';
       position: absolute;
       left: 4px;
       top: 4px;
       display: block;
       width: 84px;
       height: calc(100% - 10px);
       border-radius: 99em;
       background-color: color-mix(in srgb, var(--c-glass) 36%, transparent);
       z-index: -1;
       box-shadow:
           inset 0 0 0 1px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 10%), transparent),
           inset 2px 1px 0px -1px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 90%), transparent),
           inset -1.5px -1px 0px -1px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 80%), transparent),
           inset -2px -6px 1px -5px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 60%), transparent),
           inset -1px 2px 3px -1px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 20%), transparent),
           inset 0px -4px 1px -2px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 10%), transparent),
           0px 3px 6px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 8%), transparent);
   }

   .switcher:has(input[c-option="1"]:checked)::after {
       translate: 0 0;
       transform-origin: right;
       transition:
           background-color 400ms cubic-bezier(1, 0.0, 0.4, 1),
           box-shadow 400ms cubic-bezier(1, 0.0, 0.4, 1),
           translate 400ms cubic-bezier(1, 0.0, 0.4, 1);
       animation: scaleToggle 440ms ease;
   }

   .switcher:has(input[c-option="2"]:checked)::after {
       translate: 76px 0;
       transition:
           background-color 400ms cubic-bezier(1, 0.0, 0.4, 1),
           box-shadow 400ms cubic-bezier(1, 0.0, 0.4, 1),
           translate 400ms cubic-bezier(1, 0.0, 0.4, 1);
       animation: scaleToggle2 440ms ease;
   }

   .switcher[c-previous="1"]:has(input[c-option="2"]:checked)::after {
       transform-origin: left;
   }

   .switcher[c-previous="3"]:has(input[c-option="2"]:checked)::after {
       transform-origin: right;
   }

   .switcher:has(input[c-option="3"]:checked)::after {
       translate: 152px 0;
       transform-origin: left;
       transition:
           background-color 400ms cubic-bezier(1, 0.0, 0.4, 1),
           box-shadow 400ms cubic-bezier(1, 0.0, 0.4, 1),
           translate 400ms cubic-bezier(1, 0.0, 0.4, 1);
       animation: scaleToggle3 440ms ease;
   }

   .switcher:has(input[c-option="4"]:checked)::after {
       translate: 228px 0;
       /* یا عرض مناسب برای چهارمین گزینه */
       transform-origin: left;
       /* یا right بسته به طراحی */
       transition:
           background-color 400ms cubic-bezier(1, 0.0, 0.4, 1),
           box-shadow 400ms cubic-bezier(1, 0.0, 0.4, 1),
           translate 400ms cubic-bezier(1, 0.0, 0.4, 1);
       animation: scaleToggle4 440ms ease;
   }



   @keyframes scaleToggle {
       0% {
           scale: 1 1;
       }

       50% {
           scale: 1.1 1;
       }

       100% {
           scale: 1 1;
       }
   }

   @keyframes scaleToggle2 {
       0% {
           scale: 1 1;
       }

       50% {
           scale: 1.2 1;
       }

       100% {
           scale: 1 1;
       }
   }

   @keyframes scaleToggle3 {
       0% {
           scale: 1 1;
       }

       50% {
           scale: 1.1 1;
       }

       100% {
           scale: 1 1;
       }
   }

   @keyframes scaleToggle4 {
       0% {
           scale: 1 1;
       }

       50% {
           scale: 1.1 1;
       }

       100% {
           scale: 1 1;
       }
   }

   @media (max-width:450px) {
       .switcher {
           bottom: 10px;
       }
   }

   @media (min-width: 451px) {
       .switcher {
           flex-direction: column;
           width: 70px;
           height: auto;
           padding: 12px 8px;
           top: 50%;
           left: 20px;
           right: auto;
           translate: 0 -50%;
       }

       .switcher__option {
           width: 100%;
           height: 68px;
           padding: 16px 0;
       }

   }

   @media (min-width: 451px) {
       .switcher::after {
           right: 4px;
           top: 4px;
           width: calc(100% - 10px);
           height: 84px;
       }

       .switcher:has(input[c-option="1"]:checked)::after {
           translate: 0 0;
       }

       .switcher:has(input[c-option="2"]:checked)::after {
           translate: 0 76px;
       }

       .switcher:has(input[c-option="3"]:checked)::after {
           translate: 0 152px;
       }

       .switcher:has(input[c-option="4"]:checked)::after {
           translate: 0 228px;
       }
   }