$slider-background-color:  rgb(200, 200, 200) !default;
$slider-height:  48px !default;

$slider-track-height:  2px !default;
$slider-thumb-width:  32px !default;
$slider-thumb-height:  $slider-thumb-width !default;

$slider-thumb-default-scale: 0.5 !default;
$slider-thumb-hover-scale: 0.6 !default;
$slider-thumb-focus-scale: 0.85 !default;
$slider-thumb-disabled-scale: 0.35 !default;
$slider-thumb-disabled-border: 6px !default;

$slider-focus-thumb-width:  48px !default;
$slider-focus-thumb-height: $slider-focus-thumb-width !default;
$slider-focus-ring-border-width: 3px !default;

$slider-arrow-height: 16px !default;
$slider-arrow-width: 28px !default;

$slider-sign-height: 28px !default;
$slider-sign-width: 28px !default;
$slider-sign-top: ($slider-height / 2) - ($slider-thumb-default-scale * $slider-thumb-height / 2) - ($slider-sign-height) - ($slider-arrow-height) + 8px !default;

@keyframes sliderFocusThumb {
  0% {
    opacity: 0;
    transform: scale(0.0);
  }
  50% {
    transform: scale(1.0);
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@mixin slider-thumb-position($width: $slider-thumb-width, $height: $slider-thumb-height) {
  position: absolute;
  left: -$width / 2;
  top: ($slider-height / 2) - ($height / 2);
  width: $width;
  height: $height;
  border-radius: max($width, $height);
}

md-slider {

  height: $slider-height;
  position: relative;
  display: block;
  margin-left: 4px;
  margin-right: 4px;

  /**
   * Track
   */
  .md-track-container {
    width: 100%;
    position: absolute;
    top: ($slider-height / 2) - ($slider-track-height) / 2;
    height: $slider-track-height;
  }
  .md-track {
    position: absolute;
    left: 0;
    right: 0;
    height: 100%;
  }
  .md-track-fill {
    transition: width 0.05s linear;
  }
  .md-track-ticks {
    position: absolute;
    left: 0;
    right: 0;
    height: 100%;
  }

  /**
   * Slider thumb
   */
  .md-thumb-container {
    position: absolute;
    left: 0;
    top: 0;
    transform: translate3d(0,0,0);
    transition: transform 0.1s linear;
  }
  .md-thumb {
    z-index: 1;

    // Positioning the outer area of the thumb 6px bigger than it needs to be keeps
    // the :after area being clipped by the background of the focus-thumb animation.
    @include slider-thumb-position($slider-thumb-width + 6, $slider-thumb-height + 6);

    // We render thumb in an :after selector to fix an obscure problem with the
    // thumb being clipped by the focus-ring and focus-thumb while running the focus
    // animation.
    &:after {
      content: '';
      position: absolute;
      left: 3px;
      top: 3px;
      width: $slider-thumb-width;
      height: $slider-thumb-height;
      border-radius: max($slider-thumb-width, $slider-thumb-height);
      border: 3px solid;
    }

    transform: scale($slider-thumb-default-scale);
    transition: all 0.1s linear;
  }

  /* The sign that's focused in discrete mode */
  .md-sign {

    /* Center the children (slider-thumb-text) */
    display: flex;
    align-items: center;
    justify-content: center;

    position: absolute;
    left: -($slider-sign-height / 2);
    top: $slider-sign-top;
    width: $slider-sign-width;
    height: $slider-sign-height;
    border-radius: max($slider-sign-height, $slider-sign-width);

    transform: scale(0.4) translate3d(0,(-$slider-sign-top + 8) / 0.4,0);
    transition: all 0.2s ease-in-out;

    /* The arrow pointing down under the sign */
    &:after {
      position: absolute;
      content: '';
      left: -($slider-sign-width / 2 - $slider-arrow-width / 2);
      border-radius: $slider-arrow-height;
      top: 19px;
      border-left: $slider-arrow-width / 2 solid transparent;
      border-right: $slider-arrow-width / 2 solid transparent;
      border-top: $slider-arrow-height solid;

      opacity: 0;
      transform: translate3d(0,-8px,0);
      transition: all 0.2s ease-in-out;
    }

    .md-thumb-text {
      z-index: 1;
      font-size: 12px;
      font-weight: bold;
    }
  }

  /**
   * The border/background that comes in when focused in non-discrete mode
   */
  .md-focus-thumb {
    @include slider-thumb-position($slider-focus-thumb-width, $slider-focus-thumb-height);
    display: none;
    opacity: 0;
    background-color: #C0C0C0;
    animation: sliderFocusThumb 0.4s linear;
  }
  .md-focus-ring {
    @include slider-thumb-position($slider-focus-thumb-width, $slider-focus-thumb-height);
    border: 2px solid #D6D6D6;
    background-color: transparent;
    transform: scale(0);
    transition: all 0.2s linear;
  }
  .md-disabled-thumb {
    @include slider-thumb-position(
      $slider-thumb-width + $slider-thumb-disabled-border * 2,
      $slider-thumb-height + $slider-thumb-disabled-border * 2
    );
    transform: scale($slider-thumb-disabled-scale);
    border: $slider-thumb-disabled-border solid;
    display: none;
  }

  &.md-min {
    .md-thumb {
      &:after {
        background-color: white;
      }
    }
    .md-sign {
      opacity: 0;
    }
  }

  &:focus {
    outline: none;
  }

  /* Don't animate left/right while panning */
  &.panning {
    .md-thumb-container,
    .md-track-fill {
      transition: none;
    }
  }

  &:not([md-discrete]) {
    /* Hide the sign and ticks in non-discrete mode */
    .md-track-ticks,
    .md-sign {
      display: none;
    }

    &:not([disabled]) {
      &:hover {
        .md-thumb {
          transform: scale($slider-thumb-hover-scale);
        }
      }

      &:focus,
      &.active {
        .md-focus-thumb {
          display: block;
        }
        .md-focus-ring {
          transform: scale(1);
        }
        .md-thumb {
          transform: scale($slider-thumb-focus-scale);
        }
      }
    }
  }

  &[md-discrete] {
    /* Hide the focus thumb in discrete mode */
    .md-focus-thumb,
    .md-focus-ring {
      display: none;
    }

    &:not([disabled]) {
      &:focus,
      &.active {
        .md-sign,
        .md-sign:after {
          opacity: 1;
          transform: translate3d(0,0,0) scale(1.0);
        }
      }
    }
  }

  &[disabled] {
    .md-track-fill {
      display: none;
    }
    .md-sign {
      display: none;
    }
    .md-thumb {
      transform: scale($slider-thumb-disabled-scale);
    }
    .md-disabled-thumb {
      display: block;
    }
  }
}