html.opera {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

html.opera body {
  width: auto;
}

html.firefox .block {
  padding-left: 6px;
}

html.firefox #notes {
  padding-left: calc(6px + 2ex);
}

body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, sans-serif;
  font-size: 12px;
  width: 480px;
  min-width: 400px;
  max-width: 800px;
}

@media (min-width: 401px) {
  .firefox body {
    width: calc(100% - 6px); /* TODO: rework to avoid compensating padding of 'html.firefox .block'  */
  }
}

.firefox .chromium-only {
  display: none;
}

.block {
  display: flex;
  align-items: center;
  margin: 1em 0;
  border-bottom: 1px dotted #ccc;
  padding: 0 16px .75em;
  position: relative;
}

.block:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.collapsed, .collapsible h1 {
  cursor: pointer;
}

.collapsed .items {
  display: none;
}

h1 {
  width: 30%;
  margin: 0;
  font-size: 120%;
  font-weight: bold;
  padding-right: 8px;
  box-sizing: border-box;
  word-wrap: break-word;
}

.items {
  width: 70%;
}

label {
  display: flex;
  margin: .25ex 0;
  align-items: center;
}

label > :first-child {
  margin-right: 8px;
  flex-grow: 1;
}

label:not([disabled]) > :first-child {
  cursor: default;
}

label:not([disabled]):hover > :first-child {
  text-shadow: 0 0 0.01px rgba(0, 0, 0, .25);
  cursor: pointer;
}

button,
input[type=number],
input[type="color"],
.onoffswitch {
  width: 60px;
  box-sizing: border-box;
  flex-shrink: 0;
}

a {
  text-decoration-skip: ink;
}

button {
  text-align: center;
}

input[type=number] {
  text-align: right;
}

input[type=number]:invalid {
  background-color: rgba(255, 0, 0, 0.1);
  color: darkred;
}

input[type="color"] {
  box-sizing: border-box;
  height: 2em;
}

.iconset {
  display: flex;
}

.iconset input {
  display: block;
}

#actions {
  justify-content: space-around;
  align-items: stretch;
  padding-right: 8px;
}

#actions button {
  width: auto;
  margin-right: 8px;
}

[data-cmd="check-updates"] button {
  position: relative;
}

.update-in-progress [data-cmd="check-updates"] {
  opacity: .5;
  pointer-events: none;
}

.update-in-progress #update-progress {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  background-color: currentColor;
  content: "";
  opacity: .35;
}

#updates-installed {
  position: absolute;
  font-size: 85%;
  margin-top: 1px;
}

#updates-installed::after {
  content: attr(data-value);
  margin-left: .5ex;
  font-weight: bold;
}

#updates-installed:not([data-value]),
#updates-installed[data-value=""] {
  display: none;
}

#notes {
  background-color: #f4f4f4;
  padding: 1.5ex 16px 1ex calc(16px + 2ex);
  font-size: 90%;
  color: #999;
}

#notes ol {
  margin: 0;
  padding: 0;
}

#notes li:not(last-child) {
  margin-bottom: 1ex;
}

#notes a {
  color: inherit;
}

#notes a:hover {
  color: black;
}

#notes p {
  line-height: 1.25;
  margin-top: 1ex;
  margin-bottom: 1ex;
}

sup {
  vertical-align: baseline;
  position: relative;
  top: -0.4em;
}

@keyframes fadeinout {
  0%   { opacity: 0 }
  10%  { opacity: 1 }
  25%  { opacity: 1 }
  100% { opacity: 0 }
}