:root {
  --ui-check-size: 16px;
  --ui-check-radius: 5px;
  --ui-check-border: rgba(160, 171, 186, 0.62);
  --ui-check-bg: linear-gradient(180deg, rgba(26, 34, 49, 0.95) 0%, rgba(14, 20, 30, 0.95) 100%);
  --ui-check-glow: rgba(96, 178, 255, 0.42);
  --ui-check-active-border: rgba(118, 198, 255, 0.95);
  --ui-check-active-bg: linear-gradient(180deg, rgba(70, 157, 237, 0.86) 0%, rgba(34, 109, 176, 0.9) 100%);
  --ui-check-active-shadow: rgba(52, 154, 238, 0.46);
}

/* Базовый чекбокс-шаблон для новых UI-элементов. */
.ui-check {
  appearance: none;
  -webkit-appearance: none;
  width: var(--ui-check-size);
  height: var(--ui-check-size);
  margin: 0;
  display: inline-block;
  vertical-align: middle;
  border-radius: var(--ui-check-radius);
  border: 1px solid var(--ui-check-border);
  background: var(--ui-check-bg);
  box-shadow: inset 0 0 0 1px rgba(12, 16, 24, 0.55);
  cursor: pointer;
  transition:
    border-color 0.16s ease,
    box-shadow 0.16s ease,
    transform 0.12s ease,
    background 0.16s ease;
}

.ui-check:hover {
  border-color: rgba(176, 202, 227, 0.9);
}

.ui-check:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 2px var(--ui-check-glow),
    inset 0 0 0 1px rgba(12, 16, 24, 0.55);
}

.ui-check:checked {
  border-color: var(--ui-check-active-border);
  background: var(--ui-check-active-bg);
  box-shadow:
    0 0 0 1px var(--ui-check-active-shadow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.16);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath fill='%23ffffff' d='M4.7 9.35 1.75 6.4l1.1-1.1L4.7 7.15 9.15 2.7l1.1 1.1z'/%3E%3C/svg%3E");
  background-size: 10px 10px;
  background-repeat: no-repeat;
  background-position: center;
}

.ui-check:active {
  transform: scale(0.96);
}

.ui-check:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  filter: saturate(0.35);
}