/* ==========================================================================
   LAYOUT — HEADER / NAVIGATION
   Glassmorphism sticky · Navigation fluide · Theme toggle
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding-block: clamp(0.85rem, 1.1vw, 1.15rem);
  border-bottom: var(--glass-border);
  box-shadow: none;
  transition: box-shadow var(--transition-smooth);
}

/* Couche de verre isolée en arrière-plan : protège les textes et logos du flou GPU */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: -1;
  pointer-events: none;
  transition: background var(--transition-smooth);
}

/* Header scrollé — fond plus opaque pour masquer les éléments qui défilent dessous */
.site-header--scrolled {
  box-shadow: var(--shadow-md);
}

.site-header--scrolled::before {
  background: rgba(255, 247, 242, 0.94);
}

[data-theme="dark"] .site-header--scrolled::before {
  background: hsla(335, 30%, 12%, 0.94);
}

/* Container interne du header */
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ---- Logo ---- */
.site-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-img {
  height: 88px;
  width: auto;
  max-height: 88px;
  object-fit: contain;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__logo:hover .logo-img {
  transform: scale(1.04);
}

.logo-img--dark { display: none; }
.logo-img--light { display: block; }

[data-theme="dark"] .logo-img--light { display: none; }
[data-theme="dark"] .logo-img--dark { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-img--light { display: none; }
  :root:not([data-theme="light"]) .logo-img--dark { display: block; }
}

/* ---- Navigation principale ---- */
.nav-main {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-main__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.9rem;
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  white-space: nowrap;
  line-height: 1.2;
  transition: color var(--transition-fast),
              background-color var(--transition-fast);
}

.nav-main__link:hover,
.nav-main__link:focus-visible {
  color: var(--color-text-primary);
  background-color: var(--color-border);
}

/* Lien actif */
.nav-main__link--active {
  color: var(--color-accent-primary);
  font-weight: var(--weight-semibold);
}

.nav-main__link--active::after {
  content: '';
  position: absolute;
  bottom: 0px;
  left: 0.9rem;
  right: 0.9rem;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--color-accent-primary);
}

/* ---- Actions (CTA + Theme Toggle) ---- */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* CTA button dans le header */
.site-header__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.65rem 1.4rem;
  font-size: 0.95rem;
  font-weight: var(--weight-semibold);
  color: var(--color-text-inverse);
  background: var(--gradient-hero);
  border: none;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-skeuo-button);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.site-header__cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.site-header__cta:active {
  transform: translateY(0);
  box-shadow: var(--shadow-skeuo-pressed);
}

/* ---- Theme Toggle ---- */
.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-full);
  background: var(--color-bg-surface-elevated);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
  cursor: pointer;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  transition: background-color var(--transition-fast),
              transform var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-border);
  transform: rotate(15deg);
}

.theme-toggle__icon {
  width: 1.35rem;
  height: 1.35rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.theme-toggle__icon--moon { display: none; }
.theme-toggle__icon--sun { display: block; }

[data-theme="dark"] .theme-toggle__icon--sun { display: none; }
[data-theme="dark"] .theme-toggle__icon--moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle__icon--sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle__icon--moon { display: block; }
}

/* ---- Menu burger mobile ---- */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.75rem;
  height: 2.75rem;
  cursor: pointer;
  background: none;
  border: none;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

.nav-burger__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-smooth),
              opacity var(--transition-fast);
  transform-origin: center;
}

/* Burger actif */
.nav-burger--open .nav-burger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-burger--open .nav-burger__line:nth-child(2) {
  opacity: 0;
}
.nav-burger--open .nav-burger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* CTA mobile masqué par défaut sur desktop */
.nav-main__cta-mobile {
  display: none;
}

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .nav-burger {
    display: flex;
  }

  .nav-main {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 100dvh;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-8) var(--container-pad);
    background: var(--color-bg-primary);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-1rem);
    transition: opacity var(--transition-smooth),
                visibility var(--transition-smooth),
                transform var(--transition-smooth);
  }

  .nav-main--open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-main__link {
    font-size: var(--text-lg);
    padding: var(--space-4);
    width: 100%;
    border-radius: var(--radius-lg);
  }

  .site-header__cta:not(.site-header__cta--back) {
    display: none;
  }

  .site-header__cta--back {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
  }

  /* CTA mobile dans le menu burger */
  .nav-main__cta-mobile {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-4) var(--space-8);
    margin-top: var(--space-4);
    font-size: var(--text-base);
    font-weight: var(--weight-semibold);
    color: var(--color-text-inverse);
    background: var(--gradient-hero);
    border: none;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-skeuo-button);
    text-decoration: none;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast);
  }

  .nav-main__cta-mobile:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
  }
}