/* planeurspaysadour.net — Aviation/precision aesthetic
   Drafting paper, chart blue, signal amber. Engineered legibility. */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@400;500;600;700;800;900&family=Atkinson+Hyperlegible:ital,wght@0,400;0,700;1,400;1,700&family=Space+Mono:wght@400;700&display=swap');

:root {
  --paper: #f2f0ea;
  --paper-2: #eae7dd;
  --paper-3: #dfdcd0;
  --ink: #10161e;
  --ink-soft: #2f3844;
  --chart: #1a3f63;
  --chart-2: #2a5a85;
  --chart-line: #c8ccc5;
  --amber: #de7818;
  --amber-soft: #eea258;
  --steel: #6b6e6f;
  --danger: #b23a2b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Atkinson Hyperlegible', system-ui, sans-serif;
  font-size: 16.5px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

/* Subtle grid backdrop like drafting paper */
body {
  background-image:
    linear-gradient(to right, rgba(26,63,99,0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(26,63,99,0.03) 1px, transparent 1px);
  background-size: 32px 32px;
}

a { color: var(--chart); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--amber); }

/* Masthead — like a technical document header */
.masthead {
  background: var(--paper);
  border-bottom: 2px solid var(--ink);
  padding: 20px 0 16px;
  position: relative;
}
.masthead::before {
  content: '';
  position: absolute;
  bottom: -6px; left: 0; right: 0;
  height: 1px;
  background: var(--ink);
}
.masthead-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
}
.logo {
  font-family: 'Archivo', sans-serif;
  font-weight: 900;
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  line-height: 1;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo .marker {
  display: inline-block;
  width: 24px;
  height: 24px;
  background: var(--amber);
  color: var(--paper);
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0;
}
.logo em { font-style: normal; color: var(--chart); font-weight: 700; }
.masthead-doctype {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--steel);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  text-align: center;
  white-space: nowrap;
}
.masthead-doctype strong { color: var(--ink); }
.masthead-rev {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 4px 8px;
  border: 1px solid var(--amber);
}

/* Nav */
nav.primary {
  background: var(--ink);
  padding: 12px 0;
}
nav.primary ul {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
  list-style: none;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
}
nav.primary li { display: flex; align-items: center; }
nav.primary a {
  color: var(--paper);
  font-family: 'Archivo', sans-serif;
  font-size: 12.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  padding: 6px 14px;
  transition: background 120ms;
}
nav.primary a:hover, nav.primary a.current {
  background: var(--amber);
  color: var(--ink);
}
nav.primary li:not(:last-child)::after {
  content: '·';
  color: rgba(255,255,255,0.25);
  margin: 0 2px;
}

/* Container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 32px 96px;
}

/* Breadcrumbs — like a document trail */
.breadcrumbs {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--steel);
  margin-bottom: 32px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}
.breadcrumbs a { color: var(--steel); text-decoration: none; }
.breadcrumbs a:hover { color: var(--amber); text-decoration: underline; }
.breadcrumbs .arrow { color: var(--amber); margin: 0 8px; }

/* Article */
article.doc .eyebrow {
  display: inline-block;
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--paper);
  background: var(--chart);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 4px 10px;
  margin-bottom: 20px;
}

article.doc h1 {
  font-family: 'Archivo', sans-serif;
  font-weight: 800;
  font-size: 42px;
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 20px;
  color: var(--ink);
  max-width: 22ch;
}

/* Data plate — like an aircraft nameplate */
.dataplate {
  margin: 24px 0 40px;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
}
.dataplate .cell {
  padding: 10px 14px;
  border-right: 1px solid var(--chart-line);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.dataplate .cell:last-child { border-right: none; }
.dataplate .cell .lbl {
  display: block;
  color: var(--amber);
  font-weight: 700;
  margin-bottom: 3px;
  font-size: 10px;
}
.dataplate .cell .val {
  color: var(--ink);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* Section headings — checklist-manual style */
article.doc h2 {
  font-family: 'Archivo', sans-serif;
  font-weight: 700;
  font-size: 28px;
  line-height: 1.15;
  color: var(--ink);
  margin: 64px 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--ink);
  display: flex;
  align-items: baseline;
  gap: 14px;
}
article.doc h2 .sec {
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  color: var(--amber);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  flex-shrink: 0;
}
article.doc h2 .divider {
  color: var(--chart-line);
  font-weight: 400;
}

article.doc h3 {
  font-family: 'Archivo', sans-serif;
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--chart);
  margin: 36px 0 10px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
article.doc h3::before {
  content: '▸';
  color: var(--amber);
  font-size: 14px;
  flex-shrink: 0;
}

article.doc p {
  margin: 0 0 18px;
}

article.doc ul, article.doc ol {
  margin: 0 0 24px 22px;
}
article.doc li { margin-bottom: 8px; }

/* Lead paragraph */
.lead {
  font-family: 'Atkinson Hyperlegible', system-ui, sans-serif;
  font-weight: 400;
  font-size: 20px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin-bottom: 40px;
  padding: 20px 24px;
  background: var(--paper-2);
  border-left: 4px solid var(--amber);
}
.lead strong { color: var(--ink); font-weight: 700; }

/* Hero image — technical figure */
.figure-block {
  margin: 0 0 44px;
  border: 1px solid var(--ink);
  background: var(--paper);
}
.figure-block img {
  width: 100%;
  height: auto;
  display: block;
}
.figure-block .figure-caption {
  padding: 12px 18px;
  border-top: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex;
  gap: 16px;
  align-items: baseline;
  flex-wrap: wrap;
}
.figure-block .figure-caption .fig-num {
  color: var(--amber);
  font-weight: 700;
  white-space: nowrap;
}
.figure-block .figure-caption .fig-body {
  color: var(--paper);
  flex: 1;
  min-width: 220px;
}
.figure-block .figure-caption .fig-meta {
  color: var(--chart-line);
  font-size: 10px;
  white-space: nowrap;
}

.figure-inline {
  margin: 36px 0;
  border: 1px solid var(--ink);
}
.figure-inline img { width: 100%; height: auto; display: block; }
.figure-inline .figure-caption {
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.figure-inline .figure-caption .fig-num { color: var(--amber); font-weight: 700; margin-right: 12px; }

/* Instrument-panel numeric callouts */
.instrument-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 40px 0;
  border: 1px solid var(--ink);
  background: var(--ink);
}
.instrument-row .gauge {
  padding: 22px 20px;
  background: var(--paper);
  border-right: 1px solid var(--ink);
  text-align: center;
}
.instrument-row .gauge:last-child { border-right: none; }
.instrument-row .gauge .val {
  font-family: 'Archivo', sans-serif;
  font-weight: 900;
  font-size: 44px;
  color: var(--chart);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  display: block;
}
.instrument-row .gauge .val .u {
  font-size: 20px;
  color: var(--amber);
  margin-left: 4px;
  font-weight: 700;
}
.instrument-row .gauge .lbl {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  color: var(--steel);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-top: 8px;
  display: block;
  line-height: 1.3;
}

/* Checklist */
.checklist {
  margin: 32px 0;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: 22px 28px;
}
.checklist .checklist-title {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--chart-line);
}
.checklist ul { list-style: none; margin: 0; padding: 0; }
.checklist li {
  padding: 8px 0 8px 32px;
  position: relative;
  font-size: 15px;
  border-bottom: 1px dashed var(--chart-line);
  line-height: 1.5;
}
.checklist li:last-child { border-bottom: none; }
.checklist li::before {
  content: '☐';
  position: absolute;
  left: 0;
  top: 6px;
  color: var(--chart);
  font-size: 16px;
  font-family: 'Space Mono', monospace;
}
.checklist li strong {
  display: block;
  color: var(--ink);
  font-weight: 700;
  margin-bottom: 3px;
}

/* TOC — like a document index */
.toc {
  margin: 40px 0 48px;
  padding: 24px 0;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}
.toc-heading {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  margin-bottom: 16px;
  font-weight: 700;
}
.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 2;
  column-gap: 40px;
  counter-reset: toc;
}
.toc li {
  counter-increment: toc;
  padding: 5px 0;
  font-family: 'Atkinson Hyperlegible', sans-serif;
  font-size: 14.5px;
  break-inside: avoid;
  display: flex;
  gap: 10px;
  align-items: baseline;
}
.toc li::before {
  content: '§ ' counter(toc, decimal-leading-zero);
  color: var(--amber);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  min-width: 44px;
  flex-shrink: 0;
}
.toc a { color: var(--ink); text-decoration: none; }
.toc a:hover { color: var(--amber); }

/* Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 14px;
  font-family: 'Atkinson Hyperlegible', sans-serif;
  border: 1px solid var(--ink);
}
.data-table caption {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  text-align: left;
  margin-bottom: 8px;
  caption-side: top;
  font-weight: 700;
}
.data-table th {
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper);
  font-family: 'Space Mono', monospace;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  text-align: left;
  border-right: 1px solid var(--steel);
}
.data-table th:last-child { border-right: none; }
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--chart-line);
  border-right: 1px solid var(--chart-line);
  vertical-align: top;
}
.data-table td:last-child { border-right: none; }
.data-table tbody tr:nth-child(even) td { background: var(--paper-2); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table td.num {
  font-family: 'Space Mono', monospace;
  font-variant-numeric: tabular-nums;
  color: var(--chart);
  font-weight: 700;
}

/* Callout — warning / note styled like an aviation NOTAM */
.notam {
  margin: 32px 0;
  padding: 0;
  border: 1px solid var(--ink);
  background: var(--paper-2);
}
.notam .notam-header {
  padding: 8px 16px;
  background: var(--amber);
  color: var(--ink);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  display: flex;
  gap: 10px;
  align-items: center;
}
.notam .notam-header::before {
  content: '⚠';
  font-size: 14px;
}
.notam .notam-body { padding: 18px 24px; }
.notam .notam-body p { margin-bottom: 10px; }
.notam .notam-body p:last-child { margin-bottom: 0; }

.notam.info .notam-header { background: var(--chart); color: var(--paper); }
.notam.info .notam-header::before { content: 'ⓘ'; }

/* Pullquote — technical epigraph */
blockquote.quote {
  margin: 40px 0;
  padding: 24px 28px;
  border: 1px solid var(--ink);
  border-left: 6px solid var(--amber);
  background: var(--paper);
  font-family: 'Atkinson Hyperlegible', sans-serif;
  font-size: 19px;
  line-height: 1.45;
  font-style: italic;
  color: var(--ink);
}
blockquote.quote cite {
  display: block;
  margin-top: 14px;
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--steel);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-style: normal;
  font-weight: 700;
}

/* FAQ */
.faq { margin: 56px 0 40px; }
details {
  border: 1px solid var(--ink);
  margin-bottom: 8px;
  background: var(--paper);
}
details summary {
  font-family: 'Archivo', sans-serif;
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  padding: 14px 18px 14px 52px;
  position: relative;
  transition: background 120ms;
}
details summary:hover { background: var(--paper-2); }
details summary::-webkit-details-marker { display: none; }
details summary::before {
  content: '+';
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--paper);
  background: var(--amber);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Mono', monospace;
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}
details[open] summary::before { content: '−'; background: var(--chart); }
details[open] summary { background: var(--paper-2); border-bottom: 1px solid var(--chart-line); }
details .answer {
  padding: 14px 22px 18px 52px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.6;
}
details .answer p { margin-bottom: 10px; }
details .answer p:last-child { margin-bottom: 0; }

/* Related */
.related {
  margin: 64px 0 0;
  padding: 32px 0 0;
  border-top: 2px solid var(--ink);
}
.related-heading {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  margin-bottom: 20px;
  font-weight: 700;
}
.related-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.related-list li {
  padding: 18px 20px;
  border: 1px solid var(--ink);
  background: var(--paper);
  transition: transform 150ms;
}
.related-list li:hover { transform: translateY(-2px); background: var(--paper-2); }
.related-list .sec-tag {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  color: var(--amber);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}
.related-list a {
  font-family: 'Archivo', sans-serif;
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  display: block;
  line-height: 1.3;
}
.related-list a:hover { color: var(--chart); }

/* Author bio */
.author-bio {
  margin: 56px 0 32px;
  padding: 24px;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  align-items: start;
}
.author-bio img {
  width: 130px;
  height: 130px;
  object-fit: cover;
  border: 1px solid var(--ink);
}
.author-bio .signature {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 6px;
  font-weight: 700;
}
.author-bio h3 {
  font-family: 'Archivo', sans-serif;
  font-weight: 800;
  font-size: 22px;
  color: var(--ink);
  margin-bottom: 4px;
  border: none;
  padding: 0;
  display: block;
}
.author-bio h3::before { display: none; }
.author-bio .role {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--chart);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  font-weight: 700;
}
.author-bio p {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 8px;
  line-height: 1.55;
}

/* Disclaimer */
.disclaimer {
  margin: 56px 0 0;
  padding: 22px 28px;
  background: var(--ink);
  color: var(--paper);
  border-left: 6px solid var(--amber);
  font-size: 14px;
}
.disclaimer .label {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  display: block;
  margin-bottom: 12px;
  font-weight: 700;
}
.disclaimer p { margin-bottom: 10px; }
.disclaimer p:last-child { margin-bottom: 0; }
.disclaimer a { color: var(--amber-soft); }
.disclaimer strong { color: var(--paper); }

/* Contact form */
.contact-form {
  max-width: 560px;
  margin: 32px 0;
  padding: 28px;
  border: 1px solid var(--ink);
  background: var(--paper);
}
.contact-form label {
  display: block;
  font-family: 'Space Mono', monospace;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--chart);
  margin-bottom: 6px;
  margin-top: 20px;
  font-weight: 700;
}
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--paper-2);
  border: 1px solid var(--steel);
  color: var(--ink);
  font-family: 'Atkinson Hyperlegible', sans-serif;
  font-size: 15px;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none;
  border-color: var(--amber);
  background: var(--paper);
}
.contact-form textarea { min-height: 130px; resize: vertical; }
.contact-form button {
  margin-top: 24px;
  padding: 12px 28px;
  background: var(--amber);
  color: var(--ink);
  border: none;
  font-family: 'Archivo', sans-serif;
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 800;
  cursor: pointer;
  transition: background 120ms;
}
.contact-form button:hover { background: var(--ink); color: var(--amber); }

/* Footer */
footer.site-foot {
  border-top: 2px solid var(--ink);
  padding: 28px 0;
  margin-top: 80px;
  background: var(--paper-2);
}
footer.site-foot .inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer.site-foot .logo { font-size: 16px; }
footer.site-foot .legal {
  font-family: 'Space Mono', monospace;
  font-size: 10.5px;
  color: var(--steel);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* Responsive */
@media (max-width: 768px) {
  body { background-size: 20px 20px; }
  .masthead-inner { grid-template-columns: 1fr; gap: 8px; text-align: left; }
  .masthead-doctype { text-align: left; }
  nav.primary ul { gap: 0; }
  nav.primary li:not(:last-child)::after { display: none; }
  nav.primary a { padding: 6px 10px; font-size: 11.5px; }
  .container { padding: 32px 20px 60px; }
  article.doc h1 { font-size: 30px; }
  article.doc h2 { font-size: 22px; margin-top: 48px; flex-wrap: wrap; }
  article.doc h3 { font-size: 17px; }
  .lead { font-size: 17px; padding: 16px 18px; }
  .dataplate { grid-template-columns: repeat(2, 1fr); }
  .dataplate .cell { border-right: 1px solid var(--chart-line); border-bottom: 1px solid var(--chart-line); }
  .dataplate .cell:nth-child(2n) { border-right: none; }
  .dataplate .cell:nth-last-child(-n+2) { border-bottom: none; }
  .instrument-row { grid-template-columns: 1fr; }
  .instrument-row .gauge { border-right: none; border-bottom: 1px solid var(--ink); }
  .instrument-row .gauge:last-child { border-bottom: none; }
  .related-list { grid-template-columns: 1fr; }
  .author-bio { grid-template-columns: 1fr; }
  .author-bio img { width: 110px; height: 110px; }
  .toc ol { columns: 1; }
}

/* Focus */
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .related-list li:hover { transform: none; } }

/* Print */
@media print {
  body { background: white; color: black; font-size: 11pt; background-image: none; }
  nav.primary, .masthead, footer.site-foot, .contact-form { display: none; }
  a { color: black; }
  .notam, .checklist, .instrument-row, .toc, .dataplate, .author-bio, blockquote.quote, .disclaimer, details, .related-list li, .figure-block, .figure-inline {
    background: white; color: black; border-color: black;
  }
  .instrument-row .gauge .val { color: black; }
  .disclaimer { background: white; color: black; }
}