:root {
  color-scheme: light;
  --bg: #fbfbfa;
  --panel: #ffffff;
  --text: #1d1d1f;
  --muted: #5f6368;
  --line: #e2e2e0;
  --accent: #0b6bcb;
  --code: #f2f2f0;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #161617;
  --panel: #1f1f21;
  --text: #ececec;
  --muted: #a3a3a8;
  --line: #333336;
  --accent: #6cb6ff;
  --code: #29292c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a[href] {
  color: var(--accent);
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 16px;
  top: 8px;
  background: var(--panel);
  padding: 4px 8px;
  z-index: 1;
}

header {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding-top: 12px;
  padding-bottom: 12px;
}

h1 {
  margin: 0;
  font-size: 22px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.theme {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

select,
button {
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 10px;
}

button {
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

.lead {
  font-size: 18px;
  margin: 24px 0;
}

h2 {
  font-size: 17px;
  margin: 0 0 8px;
}

section {
  margin-bottom: 32px;
}

.demo {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 16px;
}

@media (max-width: 720px) {
  .demo {
    grid-template-columns: minmax(0, 1fr);
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  min-width: 0;
}

.hint {
  color: var(--muted);
  margin: 0 0 12px;
  font-size: 14px;
}

#tree {
  min-height: 260px;
  overflow-x: auto;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

#log {
  margin: 0;
  padding-left: 32px;
  max-height: 340px;
  overflow-y: auto;
  font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--muted);
}

#log li:first-child {
  color: var(--text);
}

.keys {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 16px;
  margin: 0;
}

.keys dd {
  margin: 0;
}

@media (max-width: 520px) {
  .keys {
    grid-template-columns: minmax(0, 1fr);
  }

  .keys dd {
    margin-bottom: 8px;
  }
}

kbd {
  font: 12px ui-monospace, SFMono-Regular, Menlo, monospace;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 5px;
  background: var(--code);
}

pre {
  background: var(--code);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
}

code {
  font: 13px ui-monospace, SFMono-Regular, Menlo, monospace;
}

p code {
  overflow-wrap: anywhere;
}

footer {
  color: var(--muted);
  padding-bottom: 32px;
}

#log:empty::before {
  content: "Click, or use the keyboard, in the tree.";
  margin-left: -32px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}