@font-face { font-family: "Open Sans"; src: url("/guides/air-to-air/fonts/OpenSans-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Open Sans"; src: url("/guides/air-to-air/fonts/OpenSans-SemiBold.ttf") format("truetype"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Open Sans"; src: url("/guides/air-to-air/fonts/OpenSans-Bold.ttf") format("truetype"); font-weight: 700; font-display: swap; }

:root {
  --green: #204020;
  --green-hover: #2d5a2d;
  --ink: #1a1a1a;
  --muted: rgba(26, 26, 26, 0.64);
  --soft: rgba(26, 26, 26, 0.48);
  --line: rgba(26, 26, 26, 0.1);
  --tint: rgba(32, 64, 32, 0.05);
  --tint-strong: rgba(32, 64, 32, 0.1);
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Open Sans", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--green); }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; }
p { margin: 0; }
ul, ol { margin: 12px 0 0; padding-left: 1.2em; }
li + li { margin-top: 6px; }

.wrap { width: min(1120px, 100% - 48px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--green); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 20; }
.skip:focus { left: 12px; }

.icon { width: 22px; height: 22px; flex: none; }
.icon-sm { width: 16px; height: 16px; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; gap: 16px; min-height: 68px; padding: 10px 0; }
.topbar .btn { padding: 8px 14px; font-size: 14px; white-space: nowrap; }
.logo-link img { height: 38px; width: auto; }
.back-link {
  color: var(--ink); font-size: 14px; font-weight: 600;
  text-decoration: none; white-space: nowrap;
}
.back-link:hover { color: var(--green); }
.topbar nav { display: flex; flex-wrap: wrap; gap: 4px; margin-left: auto; }
.topbar nav a {
  color: var(--ink); text-decoration: none; font-size: 14px; font-weight: 600;
  padding: 8px 12px; border-radius: 999px;
}
.topbar nav a:hover, .topbar nav a[aria-current="page"] { background: var(--tint); color: var(--green); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 999px;
  font-size: 15px; font-weight: 600; text-decoration: none;
  border: 1px solid transparent;
}
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-hover); }
.btn-light { background: #fff; color: var(--green); }
.btn:focus-visible, .group-card:focus-visible, .topbar nav a:focus-visible, summary:focus-visible {
  outline: 2px solid var(--green); outline-offset: 2px;
}

.hero { padding: 64px 0 48px; max-width: 46em; }
.kicker, .eyebrow {
  color: var(--green); font-size: 12px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 14px;
}
h1 { font-size: clamp(34px, 4.4vw, 52px); font-weight: 700; letter-spacing: -0.02em; }
.lead { margin-top: 18px; font-size: 18px; }
.lead-muted { margin-top: 12px; color: var(--muted); }
.checked {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 22px;
  font-size: 13px; color: var(--green); background: var(--tint);
  padding: 8px 14px; border-radius: 999px;
}

.section { padding: 56px 0; border-top: 1px solid var(--line); }
h2 { font-size: clamp(26px, 3vw, 34px); font-weight: 700; }
.section-lead { margin-top: 12px; color: var(--muted); max-width: 42em; }

.group-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 28px; }
.group-card {
  display: flex; flex-direction: column; gap: 10px;
  padding: 24px; border: 1px solid var(--line); border-radius: var(--radius);
  color: var(--ink); text-decoration: none;
}
.group-card:hover { border-color: var(--green); box-shadow: 0 10px 30px rgba(32, 64, 32, 0.08); }
.group-icon {
  display: inline-grid; place-items: center; width: 44px; height: 44px;
  border-radius: 12px; background: var(--tint); color: var(--green);
}
.group-card h3 { font-size: 20px; }
.tagline { font-weight: 600; color: var(--green); }
.choose { font-size: 15px; color: var(--muted); }
.next-step { margin-top: auto; padding-top: 12px; font-size: 14px; font-weight: 600; color: var(--green); }

.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.tile { padding: 24px; border-radius: var(--radius); background: var(--tint); }
.tile h3 { font-size: 18px; }
.tile p { margin-top: 8px; color: var(--muted); }

table { width: 100%; border-collapse: collapse; margin-top: 24px; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 14px 12px; border-bottom: 1px solid var(--line); }
th { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--soft); }
.table-wrap { overflow-x: auto; }

details.topic { border-top: 1px solid var(--line); }
details.topic:last-of-type { border-bottom: 1px solid var(--line); }
details.topic summary {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  cursor: pointer; font-weight: 700; font-size: 18px;
  padding: 18px 0; list-style: none;
}
details.topic summary::-webkit-details-marker { display: none; }
details.topic summary::after { content: "+"; color: var(--green); font-weight: 700; line-height: 1; }
details.topic[open] summary::after { content: "–"; }
.topic-body { padding: 0 0 22px; }
.topic-body h3 { margin-top: 18px; font-size: 18px; }
.topic-body p + p, .topic-body h3 + p { margin-top: 10px; }

.cta {
  margin: 8px 0 72px; padding: 40px; border-radius: 24px;
  background: var(--green); color: #fff;
}
.cta h2, .cta a { color: #fff; }
.cta ol { max-width: 40em; }
.cta .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }

.team-banner {
  background: #f6f3ea; color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.team-banner p { width: min(1120px, 100% - 48px); margin: 0 auto; padding: 12px 0; font-size: 14px; }

.note {
  margin-top: 16px; padding: 16px 18px; border-radius: 12px;
  background: var(--tint); font-size: 15px;
}

footer.site {
  border-top: 1px solid var(--line); padding: 28px 0 48px;
  color: var(--muted); font-size: 14px;
}
footer.site nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 10px; }

.entry {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 32px;
}
.entry a {
  display: flex; flex-direction: column; gap: 8px; min-height: 100%;
  padding: 22px; border: 1px solid var(--line); border-radius: var(--radius);
  color: var(--ink); text-decoration: none; background: #fff;
}
.entry a:hover { border-color: var(--green); box-shadow: 0 10px 30px rgba(32, 64, 32, 0.08); }
.entry .step {
  color: var(--green); font-size: 12px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
}
.entry strong { font-size: 20px; line-height: 1.25; }
.entry span { color: var(--muted); font-size: 15px; }

.short { margin-top: 36px; max-width: 42em; }
.short h2 { font-size: 22px; }
.callout, .note { max-width: 46em; }

.fact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
.fact {
  padding: 18px 18px 16px; border: 1px solid var(--line); border-radius: 12px; background: #fff;
}
.fact h3 { font-size: 16px; }
.fact p { margin-top: 6px; color: var(--muted); font-size: 15px; }
.fact-label {
  display: block; margin-bottom: 6px; color: var(--soft);
  font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
}

.checklist { list-style: none; padding: 0; margin-top: 8px; max-width: 46em; }
.checklist li { margin: 0; border-bottom: 1px solid var(--line); }
.checklist label {
  display: flex; gap: 12px; align-items: flex-start; padding: 12px 0; cursor: pointer;
}
.checklist input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--green); flex: none; }

.stop {
  margin-top: 28px; padding: 24px;
  border: 2px solid var(--green); border-radius: var(--radius);
}
.stop h3 { font-size: 22px; }
.stop p, .stop ul { margin-top: 12px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.btn-line { background: #fff; color: var(--green); border-color: var(--line); }
.btn-line:hover { border-color: var(--green); }
h3.topic-heading { margin-top: 32px; font-size: 20px; }
.section > h3.topic-heading:first-of-type { margin-top: 22px; }
details.topic { margin-top: 8px; }
.fallback { margin-top: 12px; color: var(--muted); font-size: 14px; max-width: 46em; }

.guide-page .hero { padding: 36px 0 4px; max-width: none; }
.guide-page .section { padding: 36px 0; }
.guide-page h1 { max-width: 18ch; }
.lede { margin-top: 12px; max-width: 34em; font-size: 18px; color: var(--muted); }

.glance, .icon-grid, .mini { display: grid; gap: 12px; margin-top: 16px; }
.glance { grid-template-columns: repeat(4, 1fr); margin-top: 28px; }
.icon-grid { grid-template-columns: repeat(3, 1fr); }
.icon-grid.wide { grid-template-columns: repeat(4, 1fr); }
.mini { grid-template-columns: repeat(3, 1fr); }
.glance article, .icon-grid article, .mini article {
  display: flex; flex-direction: column; gap: 8px;
  padding: 16px; border-radius: 14px; background: var(--tint);
}
.glyph {
  display: inline-grid; place-items: center; width: 40px; height: 40px;
  border-radius: 12px; background: #fff; color: var(--green);
}
.glance strong, .icon-grid strong, .mini strong { font-size: 15px; line-height: 1.3; }
.glance span, .icon-grid span, .mini span, .caption { color: var(--muted); font-size: 14px; }
.caption { display: block; margin-top: 10px; max-width: 46em; }

.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; max-width: 640px; }
.stats article { padding: 20px 22px; border-radius: 16px; background: var(--green); color: #fff; }
.stats .num { font-size: clamp(40px, 5vw, 56px); font-weight: 700; line-height: 0.95; letter-spacing: -0.03em; }
.stats p { margin-top: 8px; color: rgba(255,255,255,0.88); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chips li {
  list-style: none; margin: 0; padding: 8px 12px; border-radius: 999px;
  background: var(--tint); font-size: 14px; font-weight: 600;
}
.chips { padding: 0; }

.rail { list-style: none; padding: 0; margin: 8px 0 0; display: grid; gap: 8px; max-width: 40em; }
.rail li { display: flex; gap: 12px; align-items: center; margin: 0; }
.rail b {
  display: inline-grid; place-items: center; width: 32px; height: 32px; flex: none;
  border-radius: 999px; background: var(--green); color: #fff; font-size: 14px;
}

.scene {
  margin: 8px 0 0; padding: 8px 8px 12px; border: 1px solid var(--line);
  border-radius: 16px; background: #f7f8f7;
}
.scene svg { width: 100%; height: auto; display: block; }
.scene figcaption { margin: 4px 12px 0; color: var(--muted); font-size: 14px; }

@media (max-width: 800px) {
  .group-grid, .pair, .entry, .fact-grid, .glance, .icon-grid, .icon-grid.wide, .mini, .stats { grid-template-columns: 1fr; }
  .wrap { width: min(1120px, 100% - 32px); }
  .topbar nav { display: none; }
  .topbar nav.section-nav { display: flex; }
  .cta { padding: 28px 22px; }
}

@page {
  size: A4;
  margin: 14mm 14mm 18mm;
}
@media print {
  .topbar, .skip, .entry, footer.site, .no-print, .paths { display: none !important; }
  .pdf-logo { display: block !important; width: 128px; height: auto; margin: 0 0 18px; }
  details.topic > .topic-body, details.sources > ul { display: block !important; }
  details.topic summary::after,
  details.topic[open] summary::after,
  details.sources summary::after { content: none !important; }
  .intro, .fact, .stop, .callout, details.topic, .checklist li, .safety li, .chain article, .steps li, .home-photo {
    break-inside: avoid;
  }
  .choices, .fact-grid { grid-template-columns: 1fr 1fr; }
  .chain, .safety, .steps { grid-template-columns: 1fr; }
  .section { padding: 18px 0; }
  .close { break-inside: avoid; }
  .product-example { max-height: 78mm; }
}

.guide-page { scroll-padding-top: 84px; }
.intro {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 28px; align-items: center; padding: 28px 0 8px;
}
.intro h1 { font-size: clamp(32px, 4vw, 46px); max-width: 12em; }
.intro .lede { margin-top: 12px; }
.plate {
  border-radius: 18px; background: #f4f6f4; border: 1px solid var(--line); overflow: hidden;
}
.plate svg { width: 100%; height: auto; display: block; }
.home-photo img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.home-photo figcaption {
  padding: 8px 12px 10px; color: var(--muted); font-size: 12px; line-height: 1.45;
}
.cable-choice { background: #fbfaf7; }
.product-example {
  width: 100%; height: auto; aspect-ratio: 792 / 572; margin: 0 0 10px;
  object-fit: cover; border-radius: 12px; background: #f4f1ea;
}
.paths {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 22px 0 8px;
}
.paths a {
  display: flex; flex-direction: column; gap: 8px; min-height: 100%;
  padding: 20px; border: 1px solid var(--line); border-radius: 16px;
  background: #fff; color: var(--ink); text-decoration: none;
}
.paths a:hover { border-color: var(--green); }
.paths strong { font-size: 18px; line-height: 1.3; }
.paths span { color: var(--muted); font-size: 15px; }
.paths .go { margin-top: auto; padding-top: 8px; color: var(--green); font-weight: 700; font-size: 15px; }
.band { background: #f7f8f7; }
.guide-page .section { padding: 48px 0; }
.narrow { max-width: 42em; }
.chain { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 10px; align-items: stretch; margin-top: 18px; padding: 0; list-style: none; }
.chain li { margin: 0; }
.chain article { height: 100%; padding: 16px; border-radius: 14px; background: #fff; border: 1px solid var(--line); }
.chain article strong { display: block; margin-bottom: 6px; }
.chain article span { color: var(--muted); font-size: 14px; }
.chain .arrow { align-self: center; color: var(--green); font-weight: 700; }
.safety { list-style: none; padding: 0; margin: 16px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
.safety li { display: block; margin: 0; }
.safety li > div { display: block; }
.safety strong { display: block; font-size: 15px; }
.safety span { display: block; color: var(--muted); font-size: 14px; }
.pdf-logo { display: none; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 16px; padding: 0; list-style: none; }
.steps li { margin: 0; padding: 16px; border-radius: 14px; background: var(--tint); }
.steps b { display: block; color: var(--green); font-size: 13px; letter-spacing: 0.08em; }
.steps strong { display: block; margin: 6px 0; }
.steps span { color: var(--muted); font-size: 14px; }
.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.choices .fact h3 { font-size: 20px; }
.stats-single { grid-template-columns: minmax(0, 640px); }
.close {
  margin: 8px 0 56px; padding: 28px; border: 1px solid var(--line); border-radius: 18px; background: #fff;
}
.close h2 { font-size: 26px; }
.sources { margin-top: 22px; color: var(--muted); font-size: 14px; }
.sources summary { cursor: pointer; font-weight: 700; color: var(--ink); }
.topbar nav a[aria-current="true"] { background: var(--tint); color: var(--green); }

@media (max-width: 800px) {
  .intro, .paths, .chain, .safety, .steps, .choices, .stats { grid-template-columns: 1fr; }
  .chain .arrow { display: none; }
  .intro { padding-top: 20px; }
  .topbar nav.section-nav a { padding: 8px 8px; font-size: 13px; }
}