:root {
  --margin: 1rem;
  --half-margin: calc(var(--margin) / 2);
  --active-color: #2da3dd;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 9pt;
  color: white;
  background: #000;
  overflow-x: auto;
  overflow-y: hidden;
  padding: var(--margin);
  height: 100vh;
  box-sizing: border-box;
  margin: 0;
  display: grid;
  gap: var(--margin);
  grid-template-rows: min-content 1fr;
}

h1 {
  margin: 0;
  font-weight: 300;
}

#columns-container {
  display: flex;
  overflow-y: hidden;
}

.column {
  margin-inline-end: var(--margin);
  flex: 15rem 0 0;
  border: 1px solid #111;
  border-radius: 8px;
  background: #202020;
  overflow-y: auto;
}

.column:has(.feature-details) {
  flex-basis: 30rem;
}

.column ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.column ul:focus-visible {
	outline-offset: -1px;
	outline: 1px solid var(--active-color);
}

.column-title {
  padding: .5rem;
  font-size: inherit;
  font-weight: normal;
  margin: 0;
  background: #333;
  border-block-end: 1px solid #111;
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 10;
}

button {
  font-size: inherit;
  font-family: inherit;
  color: inherit;
  display: block;
  width: 100%;
  border: none;
  background: none;
  text-align: start;
}

.task-item {
	padding: var(--half-margin);
	cursor: pointer;
	border-block-end: 1px solid #111;
	outline-offset: -1px;
}

.task-item:focus-visible {
  outline: 1px solid var(--active-color);
}

.task-item:hover {
  background: #000;
}

.task-item[aria-selected="true"] {
  background: #000;
  border-inline-start: 3px solid var(--active-color);
}

.column .features {
  padding: var(--half-margin);
  display: grid;
  gap: var(--half-margin);
}

.feature-tag {
	background: #303030;
	padding: var(--half-margin);
	border-radius: 4px;
	font-size: 0.9em;
	border-inline-start: 3px solid #444;
	cursor: pointer;
	transition: background 0.2s;
	color: white;
}

.feature-tag:focus-visible {
  outline: 1px solid var(--active-color);
}

.feature-tag:hover {
  background: #000;
}

.feature-tag[aria-selected="true"] {
  border-color: var(--active-color);
  background: #000;
}

.feature-name {
  font-weight: bold;
  margin-block-end: var(--half-margin);
}

.feature-description {
  font-size: 0.9em;
  line-height: 1.4;
}

.feature-details {
  padding: 12px;
  outline-offset: -1px;
}

.feature-details:focus-visible {
  outline: 1px solid var(--active-color);
}

.feature-section {
  margin-block-end: var(--margin);
}

.section-title {
  font-weight: 600;
  margin-block-end: var(--half-margin);
  color: #aaa;
  font-size: 0.95em;
}

.mdn-link {
  display: block;
  padding: var(--half-margin);
  margin-block-end: var(--half-margin);
  background: #363636;
  border-inline-start: 3px solid #2b8cfb;
  border-radius: 4px;
  text-decoration: none;
  color: #2b8cfb;
  font-size: 0.9em;
}

.mdn-link:hover {
  background: #000;
}

.compat-data {
  padding: 0;
}

.compat-item {
  padding: var(--half-margin);
  margin-block-end: var(--half-margin);
  background: #384b29;
  border-radius: 4px;
  border-inline-start: 3px solid #4caf50;
}

.compat-item.unsupported {
  border-left-color: #f44336;
  background: #5e363c;
}

.browser-name {
  font-weight: 600;
  color: #e0e0e0;
  display: block;
  margin-block-end: var(--half-margin);
}

.browser-version {
  color: #ccc;
  font-size: 0.9em;
}

.browser-position {
  margin-block-start: var(--half-margin);
  padding: var(--half-margin);
  border-radius: 3px;
  font-size: 0.85em;
  font-weight: 500;
  display: inline-block;
}

.position-support,
.position-positive {
  background: #c8e6c9;
  color: #2e7d32;
}

.position-neutral {
  background: #000;
  color: #fff;
}

.position-oppose,
.position-negative {
  background: #ffcdd2;
  color: #c62828;
}

.spinner-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #2196f3;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}