TelegramPWA/src/components/ui/Button.scss

@mixin active-styles() {
  &:not(.disabled):not(:disabled) {
    &:hover, &:active, &.active, &:focus {
      @content;
    }
  }
}

@mixin no-ripple-styles() {
  body.animation-level-0 & {
    &:not(.disabled):not(:disabled) {
      &:active {
        @content;
      }
    }
  }
}

.Button {
  outline: none !important;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 3.5rem;
  border: 0;
  border-radius: var(--border-radius-default);
  background: transparent;
  padding: 0.625rem;
  color: white;
  line-height: 1.2;
  cursor: pointer;
  text-transform: uppercase;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
  transition: background-color .15s, color .15s;
  text-decoration: none !important;

  // @optimization
  &:active, &.clicked, body.animation-level-0 & {
    transition: none !important;
  }

  &.disabled {
    opacity: 0.5 !important;
    cursor: default;
    pointer-events: none;
  }

  &.round {
    width: 3.5rem;
    border-radius: 50%;

    i {
      font-size: 1.5rem;
    }
  }

  &.primary {
    background: var(--color-primary);
    color: var(--color-white);
    --ripple-color: rgba(0, 0, 0, .08);

    @include active-styles() {
      background: var(--color-primary-shade);
    }

    @include no-ripple-styles() {
      background: var(--color-primary-shade-darker);
    }
  }

  &.secondary {
    background: var(--color-background);
    color: rgba(var(--color-text-secondary-rgb), 0.75);
    --ripple-color: rgba(0, 0, 0, .08);

    @include active-styles() {
      background: var(--color-primary);
      color: white;
    }

    @include no-ripple-styles() {
      background: var(--color-primary-shade);
    }
  }

  &.gray {
    background: var(--color-background);
    color: var(--color-text-secondary);
    --ripple-color: rgba(0, 0, 0, .08);

    @include active-styles() {
      color: var(--color-primary);
    }

    @include no-ripple-styles() {
      background: var(--color-chat-hover);
    }
  }

  &.danger {
    background: var(--color-background);
    color: var(--color-error);
    --ripple-color: rgba(var(--color-error-rgb), .16);

    @include active-styles() {
      background: var(--color-error);
      color: var(--color-white);
    }

    @include no-ripple-styles() {
      background: var(--color-error-shade);
    }
  }

  &.text {
    background: none;

    &.primary {
      color: var(--color-primary);
      background: none;

      @include active-styles() {
        background: rgba(var(--color-primary-shade-rgb), .08);
      }

      @include no-ripple-styles() {
        background: rgba(var(--color-primary-shade-rgb), .16);
      }
    }

    &.secondary {
      background: none;
      color: var(--color-text-secondary);
    }

    &.danger {
      @include active-styles() {
        background: rgba(var(--color-error-rgb), .08);
        color: var(--color-error);
      }

      @include no-ripple-styles() {
        background: rgba(var(--color-error-rgb), .16);
      }
    }
  }

  &.faded {
    opacity: 0.75;

    @include active-styles() {
      opacity: 1;
    }

    &.activated {
      opacity: 1;
    }
  }

  &.translucent {
    background-color: transparent;
    color: var(--color-text-secondary);

    --ripple-color: rgba(var(--color-text-secondary-rgb), 0.08);

    @include active-styles() {
      background-color: rgba(var(--color-text-secondary-rgb), 0.08);
    }

    @include no-ripple-styles() {
      background-color: rgba(var(--color-text-secondary-rgb), 0.16);
    }

    &.activated {
      color: var(--color-primary);
    }
  }

  &.translucent-white {
    background-color: transparent;
    color: rgba(255, 255, 255, 0.5);
    --ripple-color: rgba(255, 255, 255, 0.08);

    @include active-styles() {
      background-color: rgba(255, 255, 255, 0.08);
      color: white;
    }

    @include no-ripple-styles() {
      background-color: rgba(255, 255, 255, 0.16);
    }
  }

  &.dark {
    background-color: rgba(0, 0, 0, 0.75);
    color: white;
    --ripple-color: rgba(255, 255, 255, 0.08);

    @include active-styles() {
      background-color: rgba(0, 0, 0, 0.85);
      color: white;
    }

    @include no-ripple-styles() {
      background-color: rgba(0, 0, 0, 0.95);
    }
  }

  &.smaller {
    height: 2.75rem;
    padding: 0.3125rem;

    &.round {
      width: 2.75rem;
    }

    &.pill {
      height: 2.5rem;
      border-radius: 1.25rem;
      padding: 0.3125rem 1rem;
    }

    &.with-icon {
      padding-left: 0.75rem;
      padding-right: 1.25rem;

      i {
        font-size: 1.5rem;
        margin-right: 0.5rem;
      }
    }

    @media (max-width: 600px) {
      height: 2.5rem;

      &.round {
        width: 2.5rem;
      }
    }
  }

  &.tiny {
    height: 2.25rem;
    padding: .4375rem;
    border-radius: var(--border-radius-default-small);
    font-size: .875rem;
    font-weight: 500;

    &.round {
      width: 2.25rem;
      height: 2.25rem;
      border-radius: 50%;
    }

    i {
      font-size: 1.25rem;
    }

    &.pill {
      height: 2rem;
      border-radius: 1rem;
      padding: 0.3125rem 1rem;
      font-size: 1rem;
    }
  }

  &.fluid {
    padding-left: 1.75rem;
    padding-right: 1.75rem;
    width: auto;

    &.tiny {
      padding-left: 1.375rem;
      padding-right: 1.375rem;
    }
  }

  &.pill {
    border-radius: 1.75rem;
    padding-left: 1.75rem;
    padding-right: 1.75rem;
    text-transform: none;
  }

  &.loading {
    position: relative;
    pointer-events: none;

    .Spinner {
      position: absolute;
      right: 0.875rem;
      top: 0.875rem;

      --spinner-size: 1.8rem;
    }
  }

  .emoji {
    vertical-align: -3px;
  }
}