stylus/global.css

:root {
  --white: hsl(0, 0%, 100%);
  --white-alpha-75: hsla(0, 0%, 100%, 0.75);
  --gray-lightness-10: hsl(0, 0%, 10%);
  --gray-lightness-20: hsl(0, 0%, 20%);
  --gray-lightness-24: hsl(0, 0%, 24%);
  --gray-lightness-25: hsl(0, 0%, 25%);
  --gray-lightness-27: hsl(0, 0%, 27%);
  --gray-lightness-30: hsl(0, 0%, 30%);
  --gray-lightness-33: hsl(0, 0%, 33%);
  --gray-lightness-38: hsl(0, 0%, 38%);
  --gray-lightness-40: hsl(0, 0%, 40%);
  --gray-lightness-45: hsl(0, 0%, 45%);
  --gray-lightness-46: hsl(0, 0%, 46%);
  --truegray: hsl(0, 0%, 50%);
  --gray-lightness-60: hsl(0, 0%, 60%);
  --gray-lightness-65: hsl(0, 0%, 65%);
  --gray-lightness-66: hsl(0, 0%, 66%);
  --gray-lightness-73: hsl(0, 0%, 73%);
  --gray-lightness-76: hsl(0, 0%, 76%);
  --gray-lightness-80: hsl(0, 0%, 80%);
  --gray-lightness-84: hsl(0, 0%, 84%);
  --gray-lightness-85: hsl(0, 0%, 85%);
  --gray-lightness-86: hsl(0, 0%, 86%);
  --gray-lightness-87: hsl(0, 0%, 87%);
  --gray-lightness-88: hsl(0, 0%, 88%);
  --gray-lightness-90: hsl(0, 0%, 90%);
  --main-bg: hsl(0, 0%, 90%);
  --gray-lightness-92: hsl(0, 0%, 92%);
  --gray-lightness-93: hsl(0, 0%, 93%);
  --gray-lightness-95: hsl(0, 0%, 95%);
  --truegray-alpha-05: hsla(0, 0%, 50%, .05);
  --truegray-alpha-06: hsla(0, 0%, 50%, .06);
  --truegray-alpha-07: hsla(0, 0%, 50%, .07);
  --truegray-alpha-1: hsla(0, 0%, 50%, .1);
  --truegray-alpha-15: hsla(0, 0%, 50%, .15);
  --truegray-alpha-2: hsla(0, 0%, 50%, .2);
  --truegray-alpha-25: hsla(0, 0%, 50%, .25);
  --truegray-alpha-3: hsla(0, 0%, 50%, .3);
  --truegray-alpha-4: hsla(0, 0%, 50%, .4);
  --truegray-alpha-5: hsla(0, 0%, 50%, .5);
  --truegray-alpha-6: hsla(0, 0%, 50%, .6);
  --truegray-alpha-7: hsla(0, 0%, 50%, .7);
  --black: hsl(0, 0%, 0%);
  --black-alpha-05: hsla(0, 0%, 0%, .05);
  --black-alpha-1: hsla(0, 0%, 0%, .1);
  --black-alpha-15: hsla(0, 0%, 0%, .15);
  --black-alpha-25: hsla(0, 0%, 0%, .25);
  --black-alpha-3: hsla(0, 0%, 0%, .3);
  --black-alpha-4: hsla(0, 0%, 0%, .4);
  --black-alpha-45: hsla(0, 0%, 0%, .45);
  --black-alpha-5: hsla(0, 0%, 0%, .5);
  --black-alpha-7: hsla(0, 0%, 0%, .7);
  --black-alpha-75: hsla(0, 0%, 0%, .75);
  --darker-red: hsl(0, 100%, 42%);
  --darkred: hsl(0, 100%, 27%);
  --maroon: hsl(0, 100%, 25%);
  --darker-maroon: hsl(0, 100%, 20%);
  --red-alpha-05: hsla(0, 100%, 50%, .05);
  --red-alpha-1: hsla(0, 100%, 50%, .1);
  --darkgreen: hsl(120, 100%, 20%);
  --darkcyan: hsl(180, 100%, 27%);
  --darkcyan-alpha-5: hsla(180, 100%, 27%, .5);
  --darkcyan-alpha-75: hsla(180, 100%, 27%, .75);
  --focus-outline: hsl(180, 100%, 34%);
  --selection: hsl(180, 50%, 34%);
}

/* in case custom browser bg is specified */
html {
  background-color: var(--white);
}

a, .disabled a:hover {
  color: var(--black);
  transition: color .5s;
  text-decoration-skip: ink;
}

a:hover {
  color: var(--gray-lightness-40);
}

.main-bg {
  background-color: var(--main-bg);
}

.truegray-alpha-05 {
  background-color: var(--truegray-alpha-05);
}

.truegray-alpha-06 {
  background-color: var(--truegray-alpha-06);
}

.truegray-alpha-1 {
  background-color: var(--truegray-alpha-1);
}

.truegray-alpha-15 {
  background-color: var(--truegray-alpha-15);
}

.truegray-alpha-2 {
  background-color: var(--truegray-alpha-2);
}

* {
  outline-color: var(--focus-outline);
}

::selection {
  color: var(--white);
  background-color: var(--selection);
}

::-moz-selection {
  color: var(--white);
  background-color: var(--selection);
}

body {
  font: normal 12px Arial, system-ui, sans-serif;
}

body:lang(ja) {
  font-family: Arial, 'Meiryo UI', 'MS Gothic', system-ui, sans-serif;
}

body:lang(zh-CN) {
  font-family: Arial, 'Microsoft YaHei UI', 'Microsoft YaHei', system-ui, sans-serif;
}

body:lang(zh-TW),
body:lang(zh-HK) {
  font-family: Arial, 'Microsoft JhengHei UI', 'Microsoft JhengHei', system-ui, sans-serif;
}

button {
  -webkit-appearance: none;
  -moz-appearance: none;
  user-select: none;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 2px 7px;
  border: 1px solid var(--gray-lightness-60);
  font: inherit;
  font-size: 13px;
  color: var(--gray-lightness-10);
  background-color: var(--gray-lightness-95);
  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAeCAYAAADtlXTHAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4QwGBBwIHvKt6QAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAL0lEQVQI12NoaGgQZ2JgYGBkYmBgYGZiYGBggrMY4VxsYsyoskQQCB2MWAxAMhkADVECDhlW9CoAAAAASUVORK5CYII=');
  background-repeat: repeat-x;
  background-size: auto 100%;
  transition: color .25s, background-color .25s, border-color .25s;
}

button:not(:disabled):hover {
  color: var(--black);
  background-color: var(--gray-lightness-90);
  border-color: var(--truegray);
}

button:active {
  background-color: var(--gray-lightness-90);
  border-color: var(--truegray);
  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAeCAYAAADtlXTHAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4QwJARIWJNZvuQAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAMElEQVQI12NoaGgIZmJgYPjLxMDA8I+JgYHhP5z1Dy7xH5X7jxQCzWQ0A9DEILYBABm5HtJk2jPHAAAAAElFTkSuQmCC');
  background-repeat: repeat-x;
  background-size: 100% 100%;
}

input  {
  font: inherit;
}

input:not([type]),
input[type="text"],
input[type="search"] {
  color: var(--black);
  background: var(--gray-lightness-93);
  height: 22px;
  line-height: 22px;
  padding: 0 3px;
  font: inherit;
  border: 1px solid var(--gray-lightness-66);
  transition: border-color .25s;
}

input[data-focused-via-click]:not([type]):focus,
input[data-focused-via-click][type="number"]:focus,
input[data-focused-via-click][type="search"]:focus,
label[data-focused-via-click] input[type="number"]:focus,
label[data-focused-via-click] + input[type="number"]:focus,
input[data-focused-via-click].config-value:focus,
label[data-focused-via-click] input.config-value:focus {
  outline: none;
  border-color: var(--focus-outline);
}

input[type="number"] {
  height: 22px;
  color: var(--black);
  background: var(--gray-lightness-93);
  border: 1px solid var(--gray-lightness-66);
  padding-top: 2px;
  padding-bottom: 2px;
}

.svg-icon.checked {
  position: absolute;
  height: 8px;
  width: 8px;
  display: none;
  fill: var(--gray-lightness-20);
  margin: 2px 0 0 2px;
}

input[type="checkbox"]:not(.slider):checked + .svg-icon.checked {
  display: inline-flex;
  transition: fill .1s;
}

input[type="checkbox"]:not(.slider) {
  -webkit-appearance: none;
  -moz-appearance: none;
  position: absolute;
  left: 0;
  top: 0;
  border: 1px solid var(--gray-lightness-46);
  height: 12px;
  width: 12px;
  display: inline-flex;
  border-radius: 2px;
  background-color: var(--truegray-alpha-15);
  margin: 0;
  transition: background-color .1s, border-color .1s;
}

input[type="checkbox"]:not(.slider):hover {
  border-color: var(--black);
  background-color: var(--truegray-alpha-25);
}

input[type="checkbox"]:not(.slider):checked + .svg-icon.checked {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

input[type="checkbox"]:not(.slider):disabled {
  background-color: transparent;
  border-color: var(--truegray);
}

input[type="checkbox"]:not(.slider):disabled + .svg-icon.checked {
  fill: var(--truegray);
}

input[type="checkbox"]:not(.slider):disabled + .svg-icon.checked + span {
  color: var(--truegray);
}

label {
  color: var(--gray-lightness-20);
  transition: color .1s;
}

label:hover {
  color: var(--black)
}

select {
  -moz-appearance: none;
  -webkit-appearance: none;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAeCAMAAADaS4T1AAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAAAMUExURQAAAIGBgYGAgIGBgSS07UcAAAAEdFJOUwAiFQpfOvseAAAAFklEQVQI12NgZGBkwA+YoZAJDhkhEAACSgAd0bXODAAAAABJRU5ErkJggg==);
  background-repeat: repeat-x;
  background-size: 100% 100%;
  height: 22px;
  font: inherit;
  color: var(--gray-lightness-20);
  background-color: var(--gray-lightness-88);
  border: 1px solid var(--gray-lightness-60);
  padding: 0 20px 0 6px;
  transition: color .5s, background-color .5s, border-color .5s;
}

select:hover,
select:focus {
  color: var(--black);
  background-color: var(--main-bg);
  border-color: var(--truegray);
}

.select-resizer {
  display: inline-flex!important;
  cursor: default;
  position: relative;
}

.svg-icon.select-arrow {
  pointer-events: none;
  cursor: default;
  display: inline-flex;
  height: 14px;
  width: 14px;
  fill: var(--gray-lightness-30);
  position: absolute;
  top: 4px;
  right: 4px;
  transition: fill .5s;
}

select:hover + .svg-icon.select-arrow,
select:focus + .svg-icon.select-arrow {
  fill: var(--black);
}

input[type="radio"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  background: var(--gray-lightness-88);
  border-radius: 50%;
  border: 1px solid var(--gray-lightness-60);
  cursor: default;
  height: 13px;
  width: 13px;
  position: relative;
}

input[type="radio"]:after {
  content: '';
  background-color: transparent;
  transform: scale(0);
  transform-origin: 50% 50%;
  transition: background-color .5s, transform .5s;
  border-radius: 50%;
  height: 7px;
  width: 7px;
  left: 2px;
  top: 2px;
  position: absolute;
}

input[type="radio"]:checked:after {
  background-color: var(--gray-lightness-30);
  transform: scale(1);
}

/* restore disabled state dimming */
button:disabled,
select:disabled,
option:disabled,
select[disabled] > option {
  color: graytext;
}

/* global stuff we use everywhere */
.hidden {
  display: none !important;
}

[data-focused-via-click] :focus,
[data-focused-via-click]:focus {
  outline: none;
}

@supports (-moz-appearance: none) {
  .moz-appearance-bug .svg-icon.checked,
  .moz-appearance-bug .onoffswitch input,
  .moz-appearance-bug input[type="radio"]:after {
    display: none !important;
  }

  .moz-appearance-bug input[type="checkbox"] {
    -moz-appearance: checkbox !important;
  }

  .moz-appearance-bug input[type="radio"] {
    -moz-appearance: radio !important;
  }

  .firefox select {
    padding: 0 20px 0 2px;
    line-height: 22px!important;
  }

  svg {
    transform: scale(1); /* de-blur */
  }

/* We can customize everything about number inputs except arrows. They're horrible in Linux FF, so we'll hide them unless hovered or focused. */
  .firefox.non-windows input[type="number"] {
    -moz-appearance: textfield;
  }

  .firefox.non-windows input[type="number"]:not(:disabled):hover,
  .firefox.non-windows input[type="number"]:focus {
    -moz-appearance: number-input;
  }

  .firefox.non-windows input[type="color"] {
    border: 1px solid var(--gray-lightness-66);
    padding: 4px;
  }

/* Firefox cannot handle fractions in font-size */
  .firefox button:not(.install) {
    line-height: 13px;
    padding: 3px 7px;
  }

  .firefox.moz-appearance-bug button:not(.install) {
    padding: 2px 4px;
  }
}