:root {
  color-scheme: light dark;
  --surface: #fafafa;
  --surface-raised: #ffffff;
  --surface-muted: #f1f5f9;
  --text: #18181b;
  --text-muted: #52525b;
  --border: #d4d4d8;
  /* Identité validée le 5 septembre 2026 : corail #FF735E et bleu nuit #172B4D.
     Le corail ne porte jamais de texte blanc (2,67:1). Sur un aplat corail le
     texte est bleu nuit (5,28:1) ; en texte sur fond clair le corail est
     remplacé par le bleu nuit, qui seul y tient le contraste. */
  --ink: #172B4D;
  --coral: #FF735E;
  --accent: var(--coral);
  --accent-ink: var(--ink);
  --accent-hover: var(--ink);
  --on-accent: var(--ink);
  --on-accent-hover: #ffffff;
  --error: #b91c1c;
  --focus: #18181b;
  --shadow: 0 1rem 3rem rgba(24, 24, 27, 0.08);
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --content-width: 74rem;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--surface);
  color: var(--text);
  font-family: Roboto, Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  font-size: 100%;
  line-height: 1.55;
}

body {
  margin: 0;
  min-width: 20rem;
  min-height: 100dvh;
}

a {
  color: inherit;
}

.skip-link {
  background: var(--text);
  color: var(--surface-raised);
  left: 1rem;
  padding: 0.75rem 1rem;
  position: fixed;
  top: 1rem;
  transform: translateY(-200%);
  z-index: 100;
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 0.1875rem solid var(--focus);
  outline-offset: 0.1875rem;
}

.site-header,
main,
footer {
  margin-inline: auto;
  max-width: var(--content-width);
  padding-inline: clamp(1rem, 4vw, 3rem);
}

.site-header {
  align-items: center;
  display: flex;
  justify-content: space-between;
  min-height: 5rem;
}

.brand {
  align-items: center;
  display: inline-flex;
  gap: 0.75rem;
  min-height: 2.75rem;
  text-decoration: none;
}

.brand-logo {
  display: block;
  height: clamp(1.75rem, 5vw, 2.25rem);
  width: auto;
}

.build-status {
  border: 0.0625rem solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 0.375rem 0.75rem;
}

.hero {
  padding-block: clamp(3rem, 9vw, 8rem) clamp(2.5rem, 7vw, 6rem);
}

.eyebrow {
  color: var(--accent-ink);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 0 0 1rem;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3,
legend {
  font-family: Newsreader, Georgia, "Times New Roman", serif;
  line-height: 1.05;
}

h1 {
  font-size: clamp(2.75rem, 8vw, 6.75rem);
  letter-spacing: -0.055em;
  margin: 0;
  max-width: 13ch;
}

.hero-copy {
  color: var(--text-muted);
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  margin: 2rem 0 0;
  max-width: 48rem;
}

.search-panel {
  background: var(--surface-raised);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 4vw, 3rem);
}

fieldset {
  border: 0;
  margin: 0;
  min-width: 0;
  padding: 0;
}

legend {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  padding: 0;
}

.form-intro,
.profile-note,
.empty-detail {
  color: var(--text-muted);
}

.form-intro {
  margin: 0.75rem 0 2rem;
}

.field-grid {
  display: grid;
  gap: 1.5rem;
}

.field-group label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.field-help {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0 0 0.625rem;
}

.field-control {
  appearance: none;
  background: var(--surface);
  border: 0.125rem solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font: inherit;
  min-height: 3rem;
  padding: 0.625rem 0.875rem;
  transition: border-color 180ms ease, background-color 180ms ease;
  width: 100%;
}

select.field-control {
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%),
    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: calc(100% - 1.25rem) 1.3rem, calc(100% - 0.9rem) 1.3rem;
  background-repeat: no-repeat;
  background-size: 0.375rem 0.375rem, 0.375rem 0.375rem;
  padding-right: 2.75rem;
}

.field-control:hover,
.field-control:focus {
  border-color: var(--text);
}

.field-control[aria-invalid="true"] {
  border-color: var(--error);
}

.field-error,
.error-summary {
  color: var(--error);
  font-weight: 700;
}

.field-error {
  margin: 0.5rem 0 0;
}

.form-footer {
  align-items: flex-start;
  border-top: 0.0625rem solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
}

button {
  background: var(--accent);
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--on-accent);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  min-height: 3rem;
  padding: 0.75rem 1.25rem;
  transition: background-color 180ms ease;
}

button:hover,
button:active {
  background: var(--accent-hover);
  color: var(--on-accent-hover);
}

.form-footer p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0;
  max-width: 34rem;
}

.profile,
.results,
.method {
  padding-block: clamp(4rem, 9vw, 7rem);
}

.profile {
  display: grid;
  gap: 2rem;
}

h2 {
  font-size: clamp(2.25rem, 5vw, 4.25rem);
  letter-spacing: -0.04em;
  margin: 0;
  max-width: 15ch;
}

.profile dl {
  border-block: 0.0625rem solid var(--border);
  margin: 0;
}

.profile dl div {
  align-items: baseline;
  border-bottom: 0.0625rem solid var(--border);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  padding-block: 1rem;
}

.profile dl div:last-child {
  border-bottom: 0;
}

.profile dt {
  color: var(--text-muted);
}

.profile dd {
  font-weight: 700;
  margin: 0;
  text-align: right;
}

.profile-note {
  margin: 0;
}

.results {
  border-top: 0.0625rem solid var(--border);
}

.empty-state {
  background: var(--surface-muted);
  border-left: 0.375rem solid var(--accent);
  margin-top: 2rem;
  max-width: 52rem;
  padding: clamp(1.25rem, 4vw, 2rem);
}

.empty-state h3 {
  font-size: 1.5rem;
  margin: 0;
}

.empty-state p {
  margin-bottom: 0;
}

.method {
  border-top: 0.0625rem solid var(--border);
}

.method ol {
  counter-reset: none;
  display: grid;
  gap: 0;
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
}

.method li {
  border-top: 0.0625rem solid var(--border);
  display: grid;
  gap: 1rem;
  grid-template-columns: 2.5rem 1fr;
  padding-block: 1.25rem;
}

.method li span {
  color: var(--accent-ink);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

footer {
  border-top: 0.0625rem solid var(--border);
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  font-size: 0.875rem;
  gap: 0.25rem;
  padding-block: 2rem;
}

footer p {
  margin: 0;
}

.airports,
.sources {
  border-top: 0.0625rem solid var(--border);
  padding-block: clamp(4rem, 9vw, 7rem);
}

.disambiguation {
  background: var(--surface-muted);
  border-left: 0.375rem solid var(--accent);
  margin-top: 2rem;
  max-width: 52rem;
  padding: clamp(1.25rem, 4vw, 2rem);
}

.choice-message {
  font-weight: 700;
  margin-top: 0;
}

.choice-list {
  display: grid;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Chaque choix est son propre formulaire : il ne doit pas creuser d'espace
   supplémentaire entre deux villes de la liste. */
.choice-form {
  margin: 0;
}

/* Un choix d'homonyme est une liste de villes, pas un appel à l'action :
   il reste sobre pour que le libellé complet se lise d'un coup d'œil. */
.choice-option {
  background: var(--surface-raised);
  border: 0.0625rem solid var(--border);
  color: var(--text);
  display: grid;
  gap: 0.25rem;
  text-align: left;
  width: 100%;
}

.choice-option:hover,
.choice-option:active {
  background: var(--surface-raised);
  border-color: var(--accent-ink);
  color: var(--text);
}

.choice-name {
  font-weight: 700;
}

.choice-alias,
.choice-count {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 400;
}

.choice-pages {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0;
}

.airports-note {
  color: var(--text-muted);
  margin: 1rem 0 0;
  max-width: 52rem;
}

.airport-block {
  margin-top: 2.5rem;
  max-width: 52rem;
}

.airport-block h3 {
  font-size: 1.25rem;
  margin: 0 0 1rem;
}

.airport-list {
  border-top: 0.0625rem solid var(--border);
  list-style: none;
  margin: 0;
  padding: 0;
}

.airport-list li {
  border-bottom: 0.0625rem solid var(--border);
  display: grid;
  gap: 0.25rem 1rem;
  padding-block: 1rem;
}

.airport-ident {
  font-weight: 700;
}

/* Le code IATA accompagne l'identifiant OACI, il ne le remplace pas : un
   aéroport qui n'en a pas reste lisible sous son seul identifiant. */
.airport-iata {
  color: var(--text-muted);
  font-weight: 400;
}

/* Un repli natif : il s'ouvre au clavier et sans JavaScript, et ce qu'il
   contient reste dans la page même fermé. */
.airport-fold {
  border-top: 0.0625rem solid var(--border);
  margin-top: 1.5rem;
}

.airport-fold > summary {
  cursor: pointer;
  font-weight: 700;
  padding-block: 1rem;
}

.airport-fold > summary:focus-visible {
  outline: 0.1875rem solid var(--accent-ink);
  outline-offset: 0.125rem;
}

.airport-fold .airport-list {
  border-top: 0;
}

.airport-distance {
  color: var(--text-muted);
}

/* L'écart et la desserte à vérifier sont des mentions factuelles : elles
   n'empruntent ni la couleur d'erreur ni celle d'un aéroport fermé. */
.airport-excluded,
.airport-service {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.source-list {
  display: grid;
  gap: 1.25rem;
  list-style: none;
  margin: 2rem 0 0;
  max-width: 52rem;
  padding: 0;
}

.source-list a {
  color: var(--accent-ink);
}

.source-adaptations,
.source-details,
.source-coverage {
  color: var(--text-muted);
  display: block;
  font-size: 0.875rem;
}

.source-details {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.source-coverage {
  margin-top: 2rem;
  max-width: 52rem;
}

@media (min-width: 48rem) {
  .field-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .form-footer {
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
  }

  .profile {
    align-items: start;
    grid-template-columns: minmax(0, 1fr) minmax(20rem, 1fr);
  }

  .profile-note {
    grid-column: 2;
  }

  .airport-list li {
    align-items: baseline;
    grid-template-columns: 5rem minmax(0, 1fr) 6rem;
  }

  .airport-service,
  .airport-excluded {
    grid-column: 2 / -1;
  }

  footer {
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #09090b;
    --surface-raised: #18181b;
    --surface-muted: #27272a;
    --text: #fafafa;
    --text-muted: #d4d4d8;
    --border: #52525b;
    /* Sur fond sombre le corail tient le contraste en texte : il redevient
       la couleur d'accent, et le survol inverse vers du blanc encré de bleu. */
    --accent: var(--coral);
    --accent-ink: var(--coral);
    --accent-hover: #ffffff;
    --on-accent: var(--ink);
    --on-accent-hover: var(--ink);
    --error: #fca5a5;
    --focus: #fafafa;
    --shadow: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}