:root {
  color-scheme: light dark;
  --page: #f4f4f6;
  --panel: #ffffff;
  --bar: #2b2b31;
  --bar-text: #f1f1f4;
  --text: #1b1b1f;
  --muted: #55555f;
  --link: #1d4ed8;
  --border: #d8d8de;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #1b1b1f;
    --panel: #26262c;
    --bar: #33333b;
    --bar-text: #f1f1f4;
    --text: #ececf1;
    --muted: #a9a9b5;
    --link: #93b4ff;
    --border: #3a3a44;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px;
  background: var(--page);
  color: var(--text);
  font:
    14px/1.45 system-ui,
    sans-serif;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 8px 12px;
}

h1 {
  margin: 0 0 2px;
  font-size: 20px;
}

.intro p {
  margin: 0;
  max-width: 78ch;
  color: var(--muted);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

nav a {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--link);
  text-decoration: none;
  font-weight: 600;
}

nav a:hover,
nav a:focus-visible {
  border-color: var(--link);
}

main {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

section {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}

h2 {
  margin: 0;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  background: var(--bar);
  color: var(--bar-text);
}

iframe {
  flex: 1;
  width: 100%;
  border: 0;
  background: #ffffff;
}

footer p {
  margin: 0;
  padding: 0 12px;
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 900px) {
  body {
    height: auto;
  }

  main {
    grid-template-columns: 1fr;
  }

  section {
    height: 85vh;
  }
}