/* Drone Pilot ADS-B manual — website edition.
   Shared style for the pilotADSB manuals: Barlow Condensed for titles (the
   app's own dialog titles), Source Serif 4 for reading, Source Sans 3 for
   labels and tables. Navy and gold are the app's own colors. */

:root {
  --navy: #1A3364;
  --navy-soft: #E8EDF6;
  --gold: #FEDA34;
  --ink: #1D1D1F;
  --gray: #5F6673;
  --rule: #D9DEE6;
  --plate: #E9ECF1;
  --page: #FFFFFF;
  --caution: #B45309;
  --warning: #B91C1C;
  --link: #1F4FA3;
  --head: 'Barlow Condensed', 'Arial Narrow', sans-serif;
  --serif: 'Source Serif 4', Georgia, serif;
  --sans: 'Source Sans 3', 'Segoe UI', Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 18px/1.6 var(--serif);
  -webkit-text-size-adjust: 100%;
}
a { color: var(--link); text-underline-offset: 2px; }
strong { font-family: var(--sans); font-weight: 700; font-size: 0.95em; }

/* ── Top bar ── */
.top {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 16px;
  height: 60px; padding: 0 24px;
  background: var(--navy); color: #fff;
}
.brand {
  font: 700 23px/1 var(--head); letter-spacing: .3px;
  color: #fff; text-decoration: none; white-space: nowrap;
}
.brand span { color: var(--gold); margin-left: 6px; font-weight: 600; }
.search { position: relative; margin-left: auto; width: min(340px, 40vw); }
.search input {
  width: 100%; height: 36px; padding: 0 12px;
  border: 0; border-radius: 6px;
  font: 16px var(--sans); background: #fff; color: var(--ink);
}
#hits {
  position: absolute; top: 42px; right: 0; width: min(440px, 92vw);
  margin: 0; padding: 0; list-style: none;
  background: #fff; border: 1px solid var(--rule); border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,.12); max-height: 70vh; overflow: auto;
}
#hits:empty { display: none; }
#hits a { display: block; padding: 10px 14px; color: var(--ink); text-decoration: none; font: 15px/1.35 var(--sans); }
#hits a:hover, #hits a:focus { background: var(--navy-soft); }
#hits b { color: var(--navy); }
#hits small { display: block; color: var(--gray); }
.menu {
  display: none; height: 36px; padding: 0 12px;
  border: 1px solid rgba(255,255,255,.5); border-radius: 6px;
  background: transparent; color: #fff; font: 600 15px var(--sans);
}

/* ── Layout ── */
.wrap { display: flex; max-width: 1180px; margin: 0 auto; }
.toc {
  position: sticky; top: 60px; align-self: flex-start;
  width: 280px; flex: none; height: calc(100vh - 60px); overflow: auto;
  padding: 24px 16px 40px 24px; border-right: 1px solid var(--rule);
  font: 15px/1.35 var(--sans);
}
.toc .ed { color: var(--gray); font-size: 13px; margin: 0 0 16px; }
.toc details { margin-bottom: 6px; }
.toc summary { cursor: pointer; list-style: none; padding: 4px 0; font-weight: 700; }
.toc summary::-webkit-details-marker { display: none; }
.toc summary a { color: var(--navy); text-decoration: none; }
.toc .n { display: inline-block; min-width: 24px; color: var(--gray); font-weight: 600; }
.toc ul { list-style: none; margin: 2px 0 10px; padding-left: 24px; }
.toc li a { display: block; padding: 3px 0; color: var(--ink); text-decoration: none; }
.toc li a:hover { color: var(--link); text-decoration: underline; }

main { flex: 1; min-width: 0; max-width: 780px; padding: 32px 48px 80px; }

/* ── Headings ── */
.kicker { margin: 0; font: 700 15px var(--sans); letter-spacing: 1.5px; text-transform: uppercase; color: var(--gray); }
h1 { margin: 2px 0 20px; font: 700 46px/1.05 var(--head); color: var(--navy); }
h2 { margin: 0 0 12px; font: 700 30px/1.15 var(--head); color: var(--navy); }
h3 { margin: 28px 0 8px; font: 700 21px/1.25 var(--head); color: var(--navy); letter-spacing: .2px; }
h2 .n, .contents .n { color: var(--gray); font-weight: 600; margin-right: 12px; }
h2 .ri { width: 26px; height: 26px; margin-left: 12px; vertical-align: -3px; }

.topic { padding-top: 36px; margin-top: 36px; border-top: 1px solid var(--rule); }
main > .topic:first-of-type { border-top: 0; margin-top: 8px; }
p, ul, ol { margin: 0 0 14px; }
li { margin-bottom: 6px; }
ol li::marker { font-family: var(--sans); font-weight: 700; color: var(--navy); }

/* rail icons inline with text */
.ri { width: 20px; height: 20px; vertical-align: -4px; margin: 0 2px; }

/* ── Boxes ── */
.badges { margin: -4px 0 14px; }
.badge {
  display: inline-block; margin: 0 6px 6px 0; padding: 2px 9px;
  border-radius: 4px; background: var(--navy-soft); color: var(--navy);
  font: 600 13px/1.6 var(--sans);
}
.ways, .related {
  margin: 0 0 20px; padding: 12px 16px 6px;
  border-left: 3px solid var(--navy); background: #F6F8FB;
  font: 16px/1.45 var(--sans);
}
.related { border-left-color: var(--rule); background: transparent; margin-top: 24px; }
.label { margin: 0 0 6px; font: 700 13px var(--sans); letter-spacing: 1px; text-transform: uppercase; color: var(--navy); }
.ways ul, .related ul { padding-left: 18px; margin-bottom: 6px; }
.callout { margin: 20px 0; padding: 12px 16px 2px; border-left: 3px solid #9AA3B2; background: #F7F8FA; font-size: 17px; }
.callout .label { color: #4B5260; }
.callout.caution { border-color: var(--caution); background: #FFF8EF; }
.callout.caution .label { color: var(--caution); }
.callout.warning { border-color: var(--warning); background: #FDF3F3; }
.callout.warning .label { color: var(--warning); }

/* ── Figures ── */
.fig { margin: 24px 0 28px; }
.plate {
  display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; align-items: flex-start;
  padding: 20px; border-radius: 10px; background: var(--plate);
}
.plate img { max-width: 100%; height: auto; }
figcaption { margin-top: 8px; font: 15px/1.4 var(--sans); color: var(--gray); }
figcaption span { font-weight: 700; color: var(--ink); }

/* ── Tables ── */
table { width: 100%; margin: 12px 0 20px; border-collapse: collapse; font: 16px/1.4 var(--sans); }
th { text-align: left; padding: 8px 10px; border-bottom: 2px solid var(--navy); color: var(--navy); font-weight: 700; }
td { padding: 8px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }

/* ── Contents page ── */
.cover { padding: 12px 0 8px; }
.cover h1 { font-size: 58px; margin-bottom: 6px; }
.cover .ed { color: var(--gray); font: 16px var(--sans); }
.contents { columns: 2; column-gap: 40px; margin-top: 28px; }
.chap { break-inside: avoid; margin-bottom: 24px; }
.chap h2 { font-size: 24px; margin-bottom: 6px; }
.chap h2 a { color: var(--navy); text-decoration: none; }
.chap ul { list-style: none; padding: 0; font: 16px/1.4 var(--sans); }
.chap li a { color: var(--ink); text-decoration: none; }
.chap li a:hover { color: var(--link); text-decoration: underline; }
.chap li .n { display: inline-block; min-width: 36px; color: var(--gray); }

.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--rule); font: 600 16px var(--sans); }
.pager a { text-decoration: none; }

/* ── Phones and small tablets ── */
@media (max-width: 900px) {
  .menu { display: block; }
  .search { width: auto; flex: 1; margin-left: 8px; }
  .brand span { display: none; }
  .toc {
    display: none; position: fixed; top: 60px; left: 0; right: 0; bottom: 0; z-index: 9;
    width: auto; height: auto; background: var(--page); border-right: 0;
  }
  body.nav-open .toc { display: block; }
  main { padding: 24px 16px 64px; }
  h1 { font-size: 38px; }
  .cover h1 { font-size: 44px; }
  .contents { columns: 1; }
  .top { padding: 0 16px; gap: 10px; }
  .plate { padding: 14px; }
}
@media print {
  .top, .toc, .pager { display: none; }
  main { padding: 0; max-width: none; }
  .topic { break-inside: avoid-page; }
}

/* two or three screens side by side */
.fig.row .plate { flex-wrap: nowrap; }
.fig.row .plate img { min-width: 0; flex: 0 1 auto; }
td:first-child { white-space: nowrap; }
@media (max-width: 600px) {
  .fig.row .plate { flex-wrap: wrap; }
  td:first-child { white-space: normal; }
}

/* link back to the store, for visitors who arrive from a search engine */
.store { margin-left: auto; color: #fff; font: 600 15px var(--sans); text-decoration: none; opacity: .85; white-space: nowrap; }
.store:hover { opacity: 1; text-decoration: underline; }
.store + .search { margin-left: 16px; }
@media (max-width: 900px) { .store { display: none; } .store + .search { margin-left: 8px; } }