body {
  background-color: var(--background);
  background-image:
    linear-gradient(to right, color-mix(in oklch, var(--border) 45%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklch, var(--border) 45%, transparent) 1px, transparent 1px);
  background-size: 96px 96px;
  color: var(--foreground);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1; }

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  text-transform: var(--case-heading);
  line-height: 1.05;
  color: var(--foreground);
}

h1 { font-family: var(--font-display); font-weight: 400; font-size: var(--text-display); letter-spacing: -0.02em; }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }

p { max-width: 65ch; }

a { color: var(--primary); text-underline-offset: 0.2em; transition: color var(--duration) var(--ease); }
a:hover { color: var(--secondary); }

:focus-visible { outline: 3px solid var(--ring); outline-offset: 3px; }

.site-entete {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in oklch, var(--background) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-entete .conteneur {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.5rem;
}

.site-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: var(--tracking-heading);
  color: var(--foreground);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.site-menu-bouton {
  display: none;
  min-height: 44px;
  min-width: 44px;
  padding: 0.6rem 1rem;
  font-family: var(--font-heading);
  font-size: var(--text-small);
  color: var(--foreground);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: border-color var(--duration) var(--ease);
}

.site-menu-bouton:hover { border-color: var(--foreground); }

#menu-principal { display: flex; gap: 2.25rem; counter-reset: nav; }

#menu-principal a {
  counter-increment: nav;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  font-family: var(--font-heading);
  font-size: var(--text-small);
  color: var(--foreground);
  text-decoration: none;
  background: linear-gradient(currentColor, currentColor) left calc(100% - 0.6rem) / 0 1px no-repeat;
  transition: background-size var(--duration) var(--ease);
}

#menu-principal a::before {
  content: counter(nav, decimal-leading-zero);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: var(--text-caption);
  color: var(--muted-foreground);
}

#menu-principal a:hover { background-size: 100% 1px; }

.message {
  max-width: var(--space-container);
  margin: 1.5rem auto 0;
  padding: 1rem var(--space-gutter);
  border-left: 3px solid var(--success);
  background: var(--surface);
  font-size: var(--text-small);
}

.message-erreur { border-left-color: var(--error); }

.ouverture {
  padding-block: var(--space-section) calc(var(--space-section) * 0.6);
  border-bottom: 1px solid var(--border);
}

.ouverture-repere,
.contact-repere {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: var(--text-caption);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-foreground);
  margin-bottom: 1.5rem;
}

.ouverture h1 { max-width: 12ch; margin-bottom: 2rem; }

.ouverture-texte {
  font-size: var(--text-body-lg);
  color: var(--muted-foreground);
  max-width: 42ch;
  margin-bottom: 2.5rem;
}

.lien-fleche {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 44px;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.125rem;
  color: var(--primary);
  text-decoration: none;
  background: linear-gradient(currentColor, currentColor) left bottom 0.45rem / 100% 1px no-repeat;
  transition: color var(--duration) var(--ease), gap var(--duration) var(--ease);
}

.lien-fleche:hover { color: var(--foreground); gap: 1rem; }

.contact { padding-block: var(--space-section); }

.contact .conteneur {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 2rem var(--space-gutter);
}

.contact h2 { grid-column: 1 / span 5; }

.contact form {
  grid-column: 7 / span 6;
  display: grid;
  gap: 0.5rem;
}

.contact label {
  font-family: var(--font-heading);
  font-size: var(--text-small);
  font-weight: 500;
  margin-top: 1rem;
}

.contact label:first-of-type { margin-top: 0; }

.contact input:not([type="hidden"]),
.contact textarea {
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 1rem;
  font: inherit;
  color: var(--foreground);
  background: var(--surface);
  border: 1px solid var(--input);
  border-radius: var(--radius-md);
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.contact textarea { min-height: 10rem; resize: vertical; }

.contact input:hover,
.contact textarea:hover { border-color: var(--muted-foreground); }

.contact input:focus,
.contact textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--ring) 35%, transparent);
}

.contact button[type="submit"] {
  justify-self: start;
  margin-top: 1.5rem;
  min-height: 48px;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1rem;
  color: var(--primary-foreground);
  background: var(--primary);
  border: 1px solid var(--primary);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: background-color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.contact button[type="submit"]:hover { background: var(--secondary); border-color: var(--secondary); }

.contact form p {
  margin-top: 1rem;
  font-size: var(--text-small);
  color: var(--muted-foreground);
}

.contact form p a { display: inline-block; padding-block: 0.6rem; }

.site-pied {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
  font-size: var(--text-small);
  color: var(--muted-foreground);
}

.site-pied .conteneur {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.site-pied nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }

.site-pied a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--muted-foreground);
}

.site-pied a:hover { color: var(--foreground); }

@media (max-width: 820px) {
  .contact h2,
  .contact form { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .site-entete .conteneur { flex-wrap: wrap; }
  .site-menu-bouton { display: inline-flex; align-items: center; }
  #menu-principal { display: none; width: 100%; flex-direction: column; gap: 0; padding-bottom: 1rem; }
  .menu-ouvert #menu-principal { display: flex; }
  #menu-principal a { border-top: 1px solid var(--border); padding-block: 0.5rem; }
  .contact button[type="submit"] { justify-self: stretch; }
}

@media (prefers-reduced-motion: reduce) {
  .lien-fleche, #menu-principal a, a { transition: none; }
}