header nav {
  position: fixed;
  inset: 0 0 auto 0;
  width: 100%;
  min-height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;

  /* Verre teinté sombre — fonctionne sur fond clair et sombre */
  background: rgba(8, 20, 38, 0.52);
  backdrop-filter: blur(24px) saturate(1.8);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  border-bottom: .5px solid rgba(255, 255, 255, .13);
  box-shadow:
    0 .125rem 2.5rem rgba(0, 0, 0, .18),
    inset 0 1px 0 rgba(255, 255, 255, .09);
}

.nav-logo {
  display: flex;
  align-items: center;
  min-height: var(--nav-height);
  margin-left: 0;
  position: relative;
}

.nav-logo p {
  margin: 0 0 0 4.5rem;
  color: var(--theme-on-dark-color);
  opacity: 0.9;
  transition: opacity .3s ease, text-shadow .3s ease;
}

.nav-logo img {
  position: absolute;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: var(--nav-height);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.navlink {
  color: color-mix(in srgb, var(--theme-on-dark-color) 80%, transparent);
  transition: 0.3s ease;
  margin-right: 0;
}

.navlink:hover {
  color: var(--theme-on-dark-color);
}

@keyframes nav-underline-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.navlink--active {
  color: var(--theme-on-dark-color);
  position: relative;
}

.navlink--active::after {
  content: '';
  position: absolute;
  bottom: -.2rem;
  left: 0;
  width: 100%;
  height: .1rem;
  background: currentColor;
  animation: nav-underline-in .25s ease forwards;
}

.nav-logo-active {
  display: inline-block;
  position: relative;
}

.nav-logo-active::after {
  content: '';
  position: absolute;
  bottom: -.1rem;
  left: 0;
  width: 100%;
  height: .1rem;
  background: currentColor;
  animation: nav-underline-in .25s ease forwards;
}

.nav-theme-form {
  display: flex;
  align-items: center;
  margin: 0;
}

.nav-theme-form input[type="hidden"] {
  display: none;
}

.nav-theme-toggle {
  width: 2.8rem;
  height: 2.8rem;
  margin: 0;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 999rem;
  background: transparent;
  color: var(--theme-on-dark-color);
  font-size: 2.8rem;
  line-height: 1;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    text-shadow 0.2s ease,
    filter 0.2s ease;
  text-shadow:
    0 0 0.18rem rgba(255, 255, 255, 0.45),
    0 0 0.45rem rgba(255, 255, 255, 0.28),
    0 0 0.8rem rgba(120, 220, 255, 0.16);
}

.nav-theme-toggle:hover {
  transform: scale(1.12);
  filter: brightness(1.18);
  text-shadow:
    0 0 0.3rem rgba(255, 255, 255, 0.95),
    0 0 0.7rem rgba(255, 255, 255, 0.65),
    0 0 1.4rem rgba(120, 220, 255, 0.55);
}

.logo {
  height: 4rem;
  padding: 0.2rem 0;
  transition: opacity .3s ease, filter .3s ease, transform .3s ease;
}

.logo-c {
  opacity: 0.88;
}

.logo-nb {
  opacity: 0;
}

.nav-logo:hover .logo-c {
  opacity: 1;
  filter: brightness(1.1) saturate(1.15) drop-shadow(0 0 .45rem rgba(100, 200, 160, .40));
  transform: scale(1.05);
}

/* ── Bouton Cerfa dans la nav (superuser) ── */
.nav-cerfa-btn {
  width: auto;
  padding: 0;
  margin: 0;
  background: none;
  border: none;
  font: inherit;
  cursor: pointer;
  color: color-mix(in srgb, var(--theme-on-dark-color) 80%, transparent);
  transition: color 0.3s ease;
  border-radius: 0;
}

.nav-cerfa-btn:hover {
  color: var(--theme-on-dark-color);
  background: none;
}

/* ── Modale de navigation CERFA (superuser) ── */
.nav-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.68);
  backdrop-filter: blur(10px) saturate(0.75);
  -webkit-backdrop-filter: blur(10px) saturate(0.75);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.nav-modal-backdrop[hidden] {
  display: none;
}

.nav-modal-card {
  background: #0f1e32;
  color: rgba(255, 255, 255, 0.92);
  border-radius: 1.25rem;
  padding: 1.75rem;
  width: min(90vw, 34rem);
  border: 0.0625rem solid rgba(255, 255, 255, 0.12);
  box-shadow:
    0 2rem 5rem rgba(0, 0, 0, 0.55),
    0 0.5rem 1.5rem rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  text-align: left;
}

.nav-modal-card h2 {
  margin: 0 0 1.25rem;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.nav-modal-links {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-modal-links a {
  display: flex;
  align-items: center;
  padding: 0.9rem 1.25rem;
  background: rgba(255, 255, 255, 0.06);
  border: 0.0625rem solid rgba(255, 255, 255, 0.1);
  border-radius: 0.875rem;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.5rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.nav-modal-links a:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.22);
  transform: translateX(0.2rem);
}

.nav-modal-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: auto;
  padding: 0.45rem 1.25rem;
  margin: 0;
  border: 0.0625rem solid rgba(255, 255, 255, 0.16);
  border-radius: 999rem;
  background: transparent;
  color: rgba(255, 255, 255, 0.5);
  font-size: 1.3rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
}

/* ── Modale — thème jour ── */
html[data-theme="day"] .nav-modal-card {
  background: #fff;
  color: var(--theme-text-color);
  border-color: rgba(0, 0, 0, 0.1);
  box-shadow:
    0 2rem 5rem rgba(0, 0, 0, 0.22),
    0 0.5rem 1.5rem rgba(0, 0, 0, 0.1);
}

html[data-theme="day"] .nav-modal-card h2 {
  color: rgba(0, 0, 0, 0.35);
}

html[data-theme="day"] .nav-modal-links a {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.1);
  color: var(--theme-text-color);
}

html[data-theme="day"] .nav-modal-links a:hover {
  background: rgba(0, 0, 0, 0.08);
  border-color: rgba(0, 0, 0, 0.18);
}

html[data-theme="day"] .nav-modal-close {
  border-color: rgba(0, 0, 0, 0.18);
  color: rgba(0, 0, 0, 0.45);
}

html[data-theme="day"] .nav-modal-close:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--theme-text-color);
}

/* ── Mode jour : verre clair avec reflet ── */
html[data-theme="day"] header nav {
  background: rgba(255, 255, 255, .52);
  border-bottom: .5px solid rgba(255, 255, 255, .80);
  box-shadow:
    0 .125rem 2rem rgba(0, 0, 0, .06),
    inset 0 1px 0 rgba(255, 255, 255, .94);
}

html[data-theme="day"] .navlink,
html[data-theme="day"] .nav-cerfa-btn {
  color: color-mix(in srgb, var(--theme-text-color) 72%, transparent);
}

html[data-theme="day"] .navlink:hover,
html[data-theme="day"] .nav-cerfa-btn:hover {
  color: var(--theme-text-color);
  background: none;
}

html[data-theme="day"] .nav-logo p {
  color: color-mix(in srgb, var(--theme-text-color) 82%, transparent);
}

html[data-theme="day"] .nav-theme-toggle {
  background: transparent;
  color: var(--theme-text-color);
  text-shadow: none;
}

html[data-theme="day"] .nav-theme-toggle:hover {
  filter: brightness(0.82);
  text-shadow:
    0 0 .3rem color-mix(in srgb, var(--theme-text-color) 45%, transparent),
    0 0 .7rem color-mix(in srgb, var(--theme-text-color) 25%, transparent);
}

/* ── Hover logo + texte ── */
.nav-logo:hover p {
  opacity: 1;
}

html[data-theme="night"] .nav-logo:hover p {
  text-shadow:
    0 0 .8rem rgba(255, 255, 255, .35),
    0 0 1.5rem rgba(180, 230, 255, .18);
}

html[data-theme="day"] .nav-logo:hover p {
  text-shadow: 0 0 .7rem rgba(0, 90, 140, .22);
}

/* ── Bouton hamburger ── */
.nav-hamburger {
  display: none;
  width: 2.8rem;
  height: 2.8rem;
  margin: 0;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 999rem;
  color: var(--theme-on-dark-color);
  font-size: 1.8rem;
  line-height: 1;
  cursor: pointer;
  transition: transform .2s ease, filter .2s ease;
}

.nav-hamburger:hover {
  background: none;
  filter: brightness(1.2);
  transform: scale(1.1);
}

html[data-theme="day"] .nav-hamburger {
  color: var(--theme-text-color);
}

/* ── Menu mobile ── */
@media (max-width: 48rem) {
  .nav-hamburger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    min-height: 0;
    padding: 0.5rem 0 0.75rem;
    background: rgba(8, 20, 38, 0.97);
    backdrop-filter: blur(24px) saturate(1.8);
    -webkit-backdrop-filter: blur(24px) saturate(1.8);
    border-bottom: .5px solid rgba(255, 255, 255, .13);
    box-shadow: 0 .5rem 2rem rgba(0, 0, 0, .35);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-0.4rem);
    transition: visibility .2s, opacity .2s ease, transform .2s ease;
    pointer-events: none;
  }

  .nav-links.is-open {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links .navlink,
  .nav-links .nav-cerfa-btn {
    width: 100%;
    text-align: left;
    padding: 0.85rem 2rem;
    border-radius: 0;
    font-size: 1.5rem;
  }

  html[data-theme="day"] .nav-links {
    background: rgba(255, 255, 255, .97);
    border-bottom: .5px solid rgba(0, 0, 0, .08);
    box-shadow: 0 .5rem 2rem rgba(0, 0, 0, .12);
  }

  html[data-theme="day"] .nav-links .navlink,
  html[data-theme="day"] .nav-links .nav-cerfa-btn {
    color: color-mix(in srgb, var(--theme-text-color) 80%, transparent);
  }

  html[data-theme="day"] .nav-links .navlink:hover,
  html[data-theme="day"] .nav-links .nav-cerfa-btn:hover {
    color: var(--theme-text-color);
    background: rgba(0, 0, 0, .04);
  }

  .nav-links .navlink:hover,
  .nav-links .nav-cerfa-btn:hover {
    background: rgba(255, 255, 255, .06);
  }
}