:root {
  --bg: #f4f6f8;
  --panel-bg: #ffffff;
  --primary: #0052cc;
  --hover: #e6f0ff;
  --border: #dde2e6;
  --dot-size: 12px;
  --dot-gap: 6px;
}
* {
  box-sizing: border-box;
}
#matrix-body {
  margin: 0;
  height: 100vh;
  display: flex;
  font-family: "Inter", sans-serif;
  background: var(--bg);
  color: #333;
}
#matrix-container {
  display: grid;
  grid-template-columns: 1fr 2fr 3fr;
  gap: 0.1em;
  height: 100vh;
  overflow: auto;
}
#features,
#files,
#project-viewer {
  background: var(--panel-bg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  padding: 16px;
  margin: 0.5em;
  overflow: auto;
}
#features {
  flex: 0 0 300px;
}
#files {
  flex: 1;
}
#project-viewer {
  font-family: monospace;
  white-space: pre;
  height: 100%;
}
details {
  margin-bottom: 12px;
}
summary {
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  padding-left: 24px;
}
summary::before {
  content: "▸";
  position: absolute;
  left: 0;
  transition: transform 0.2s ease;
}
details[open] summary::before {
  transform: rotate(90deg);
}
label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px;
  border-radius: 4px;
  transition: background 0.2s;
}
label:hover,
label.hovered {
  background: var(--hover);
}
input[type="checkbox"] {
  margin-right: 8px;
}
.dots-container {
  display: grid;
  grid-auto-flow: column;
  grid-gap: var(--dot-gap);
  min-width: 60px;
}
.dot {
  width: var(--dot-size);
  height: var(--dot-size);
  border-radius: 50%;
}
.file-item {
  padding: 12px;
  margin-bottom: 8px;
  border: 2px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition:
    background 0.2s,
    border-color 0.2s;
  display: flex;
  gap: 1em;
  align-items: center;
}
.file-item.selected {
  border-color: var(--file-color);
  background: rgba(0, 82, 204, 0.05);
}
.file-item:hover,
.file-item.hovered {
  background: var(--hover);
}
.file-count,
.file-coverage {
  width: 2em;
  text-align: right;
  margin-right: 8px;
  font-weight: 500;
  color: #555;
  font-variant-numeric: tabular-nums;
}
.file-pre {
  margin: 0;
  background: #f8f8fa;
  font-family: monospace;
}
/* Override Prism/other defaults */
.file-pre,
.file-pre code,
.file-pre pre {
  overflow: visible !important;
  max-height: none !important;
  padding: 0 !important;
}
.file-line {
  position: relative;
  display: flex;
  align-items: stretch;
  white-space: pre;
  line-height: 1.15; /* or 1 */
  padding: 0;
}
.green-bar {
  width: 6px;
  min-width: 6px;
  margin-right: 8px;
  background: #2ecc40;
  border-radius: 0; /* no rounding */
  align-self: stretch;
  display: inline-block;
  height: 1.15em;
  margin: 0;
}
.project-filename {
  font-weight: bold;
  font-size: 16px;
  margin-bottom: 0.5em;
  background: var(--hover);
  padding: 0.25em;
  /*border-bottom: 1px solid #ccc;*/
}
summary,
label,
.file-item {
  user-select: none;
}