:root {
  --bg: #f4f5f2;
  --surface: #ffffff;
  --text: #16191d;
  --muted: #5b626b;
  --line: #d9ddd6;
  --accent: #1f5f8b;
  --code-bg: #eef0ec;
  --warn: #a4430b;
  --vfr: #1d7a3a;
  --mvfr: #1f5fbf;
  --ifr: #c0282d;
  --lifr: #a21caf;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111416;
    --surface: #1a1e21;
    --text: #e6e8e4;
    --muted: #9aa2a9;
    --line: #2d3338;
    --accent: #7ab8e6;
    --code-bg: #0c0f11;
    --warn: #f0a068;
    --vfr: #4fbf72;
    --mvfr: #6fa6f2;
    --ifr: #f06a6e;
    --lifr: #e07bf0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--sans);
}

a { color: var(--accent); }
code, pre { font-family: var(--mono); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.brand {
  font: 700 1.15rem var(--mono);
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.search {
  display: flex;
  flex: 1 1 320px;
  gap: 8px;
  max-width: 560px;
}

.search input {
  flex: 1;
  min-width: 0;
  padding: 9px 12px;
  font: 1rem var(--mono);
  text-transform: uppercase;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.search input::placeholder { text-transform: none; color: var(--muted); }
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.search button {
  padding: 9px 16px;
  font: 600 0.95rem var(--sans);
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

@media (prefers-color-scheme: dark) {
  .search button { color: #0c0f11; }
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 16px 8px;
}

.meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 16px; }

.intro h1 { font-size: 1.4rem; margin: 8px 0 12px; }
.links { padding-left: 1.2em; }
.links a { font-family: var(--mono); }

.error {
  padding: 12px 14px;
  border-left: 4px solid var(--warn);
  background: var(--surface);
}

.station {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.station > header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  margin-bottom: 8px;
}

.station h2 { margin: 0; font: 700 1.35rem var(--mono); }
.station .name { margin: 0; color: var(--muted); flex: 1 1 auto; }

.cat {
  font: 700 0.8rem var(--mono);
  padding: 2px 8px;
  border-radius: 4px;
  color: #fff;
}
.cat-vfr { background: var(--vfr); }
.cat-mvfr { background: var(--mvfr); }
.cat-ifr { background: var(--ifr); }
.cat-lifr { background: var(--lifr); }
@media (prefers-color-scheme: dark) {
  .cat { color: #0c0f11; }
}

.station h3 {
  margin: 14px 0 4px;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.when { margin: 0 0 6px; font-size: 0.92rem; }
.when.stale { color: var(--warn); font-weight: 600; }
.note { margin: 0; color: var(--muted); }

pre {
  margin: 0 0 10px;
  padding: 10px 12px;
  background: var(--code-bg);
  border-radius: 6px;
  font-size: 0.9rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

dl {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px 16px;
  margin: 0;
}
dl div { min-width: 0; }
dt { font-size: 0.78rem; color: var(--muted); }
dd { margin: 0; }

footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 8px 16px 32px;
  color: var(--muted);
  font-size: 0.85rem;
}
footer p { margin: 4px 0; }

.agents, .directory { margin-top: 28px; }
.agents h2, .directory h2 { font-size: 1.1rem; margin: 0 0 8px; }
.directory h1 { font-size: 1.3rem; margin: 8px 0; }

.prefixes {
  display: block;
  font-family: var(--mono);
}
.prefixes div {
  display: flex;
  gap: 12px;
  padding: 4px 0;
  border-top: 1px solid var(--line);
}
.prefixes dt { width: 1.2em; font-size: 1rem; color: var(--muted); font-weight: 700; }
.prefixes dd { display: flex; flex-wrap: wrap; gap: 4px 12px; }

.stations { list-style: none; padding: 0; margin: 0; }
.stations li { padding: 5px 0; border-top: 1px solid var(--line); }
.stations strong { font-family: var(--mono); }