:root {
  --blink: #4285f4;
  --gecko: #ff9400;
  --webkit: #1b9e77;
  --bg: #ffffff;
  --card: #f5eefd;
  --text: #1a1a1a;
  --muted: #666666;
  --border: #e0e0e0;
  --accent: #4285f4;

  font-size: clamp(1em, 3vw, 1.3em);
  --margin: 2em;
  --margin-xs: calc(var(--margin) / 2);
}

* { box-sizing: border-box; }

body {
  margin: var(--margin) auto;
  padding: 0 var(--margin);
  max-width: 50rem;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  display: grid;
  gap: var(--margin);
}

body > * {
  padding: var(--margin-xs);
  border-radius: 1rem;
  background: linear-gradient(to bottom, var(--card), var(--bg));
  box-shadow: 0 3rem 2rem 0 #0002;
}

.site-header h1 {
  margin-block-start: 0;
}

.channel-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.channel-btn {
  background: transparent;
  color: var(--muted);
  border: none;
  padding: 0.45rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
}

.channel-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.card h2 {
  margin: 0 0 var(--margin-xs);
  font-size: 1.3rem;
}

a { color: var(--accent); }

.chart-wrap {
  position: relative;
  height: 360px;
}

.status {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.5rem 0;
  text-align: center;
}

.status.error { color: #ff6b6b; }

.engine-tabs {
  display: inline-flex;
  gap: 0.5rem;
  margin-block-end: var(--margin-xs);
}

.engine-tab {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 100vw;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-family: inherit;
  font-size: .8em;
}

.engine-tab.is-active[data-engine="blink"] { border-color: var(--blink); color: var(--blink); }
.engine-tab.is-active[data-engine="gecko"] { border-color: var(--gecko); color: var(--gecko); }
.engine-tab.is-active[data-engine="webkit"] { border-color: var(--webkit); color: var(--webkit); }

.test-filter {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  margin-block-end: var(--margin-xs);
}

.failures-tree {
  max-height: 75vh;
  overflow-y: auto;
  font-family: "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 0.9rem;
  border: 1px solid var(--border);
}

.tree-children {
  margin-inline-start: 1rem;
  border-inline-start: 1px solid var(--border);
  padding-inline-start: 0.5rem;
}

.tree-dir > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.25rem;
  border-block-end: 1px solid var(--border);
}

.tree-dir > summary::-webkit-details-marker { display: none; }

.tree-dir > summary::before {
  content: "\25B6";
  color: var(--muted);
  font-size: 0.7em;
  transition: transform 0.15s ease;
}

.tree-dir[open] > summary::before { transform: rotate(90deg); }

.tree-dir > summary:hover { color: var(--accent); }

.tree-name { font-weight: 600; }

.tree-count {
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 100vw;
  padding: 0 0.5rem;
  font-size: 0.75em;
}

.tree-file {
  padding: 0.35rem 0.25rem;
  border-block-end: 1px solid var(--border);
  word-break: break-all;
}

.tree-file a {
  color: var(--text);
  text-decoration: none;
}

.site-footer {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}