/* ═══════════════════════════════════════════════════════════
   TARA Institut — Header premium (topbar + navbar)
   ═══════════════════════════════════════════════════════════ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.site-header.header--hidden {
  transform: translateY(-100%);
}

/* ─────────────────────────────────────────────
   TOPBAR — bande institutionnelle
───────────────────────────────────────────── */
.topbar {
  background: var(--color-navy);
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.78rem;
  height: var(--topbar-height);
  overflow: hidden;
  transition: height var(--duration-base) var(--ease-smooth),
              opacity var(--duration-base) var(--ease-smooth);
}

.site-header.header--scrolled .topbar {
  height: 0;
  opacity: 0;
}

.topbar__inner {
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.topbar__group {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.topbar__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  white-space: nowrap;
  color: rgba(255, 255, 255, 0.82);
  transition: color var(--duration-fast);
}

a.topbar__item:hover { color: #fff; }

.topbar__item svg {
  width: 13px;
  height: 13px;
  color: var(--color-red-light);
  flex-shrink: 0;
}

.topbar__divider {
  width: 1px;
  height: 14px;
  background: rgba(255, 255, 255, 0.16);
}

.topbar__socials {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar__social {
  display: inline-flex;
  width: 24px;
  height: 24px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--duration-fast), background var(--duration-fast);
}

.topbar__social:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.topbar__social svg { width: 14px; height: 14px; }

/* ─────────────────────────────────────────────
   NAVBAR principale
───────────────────────────────────────────── */
.navbar {
  height: var(--navbar-height);
  background: var(--navbar-bg);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: height var(--duration-base) var(--ease-smooth),
              border-color var(--duration-base) var(--ease-smooth),
              box-shadow var(--duration-base) var(--ease-smooth),
              background var(--duration-base) var(--ease-smooth);
}

.site-header.header--scrolled .navbar {
  height: var(--navbar-height-small);
  border-bottom-color: var(--navbar-border);
  box-shadow: 0 4px 30px rgba(13, 18, 50, 0.08);
}

[data-theme="dark"] .site-header.header--scrolled .navbar {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  gap: var(--space-6);
}

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

.navbar__logo-img {
  width: 46px;
  height: 46px;
  object-fit: contain;
  flex-shrink: 0;
  transition: transform var(--duration-base) var(--ease-bounce);
}

.site-header.header--scrolled .navbar__logo-img {
  width: 40px;
  height: 40px;
}

.navbar__logo:hover .navbar__logo-img {
  transform: scale(1.06) rotate(-4deg);
}

.navbar__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.navbar__logo-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-extrabold, 800);
  font-size: 1.18rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.navbar__logo-name b { color: var(--color-red); font-weight: inherit; }

.navbar__logo-sub {
  font-size: 0.58rem;
  font-weight: var(--weight-semibold);
  color: var(--text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 2px;
}

/* ── Navigation ── */
.navbar__nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.navbar__link {
  position: relative;
  padding: 9px 15px;
  font-size: 0.9rem;
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: 5px;
  left: 50%;
  width: 5px;
  height: 5px;
  background: var(--color-red);
  border-radius: 50%;
  transform: translateX(-50%) scale(0);
  transition: transform var(--duration-base) var(--ease-bounce);
}

.navbar__link:hover {
  color: var(--text-primary);
  background: var(--bg-overlay);
}

.navbar__link.active {
  color: var(--color-red);
  font-weight: var(--weight-semibold);
}

.navbar__link.active::after {
  transform: translateX(-50%) scale(1);
}

/* ── Actions ── */
.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* Dark mode toggle */
.theme-toggle {
  position: relative;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  transition: background var(--duration-fast), color var(--duration-fast),
              border-color var(--duration-fast);
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--bg-overlay);
  color: var(--text-primary);
  border-color: var(--border-mid);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  position: absolute;
  transition: opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-base) var(--ease-bounce);
}

[data-theme="light"] .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }
[data-theme="light"] .icon-sun  { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="dark"]  .icon-sun  { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="dark"]  .icon-moon { opacity: 1; transform: rotate(0) scale(1); }

/* Lang switcher */
.lang-switcher { position: relative; }

.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 40px;
  padding-inline: 12px;
  font-size: 0.78rem;
  font-weight: var(--weight-bold);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: transparent;
  cursor: pointer;
  transition: var(--transition-base);
  letter-spacing: 0.06em;
}

.lang-toggle:hover {
  border-color: var(--border-mid);
  color: var(--text-primary);
  background: var(--bg-overlay);
}

.lang-toggle svg {
  width: 12px;
  height: 12px;
  transition: transform var(--duration-base) var(--ease-smooth);
}

.lang-switcher.open .lang-toggle svg { transform: rotate(180deg); }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 168px;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.98);
  transform-origin: top right;
  transition: opacity var(--duration-base) var(--ease-smooth),
              transform var(--duration-base) var(--ease-smooth),
              visibility var(--duration-base);
  z-index: var(--z-dropdown);
}

.lang-switcher.open .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: 10px 12px;
  font-size: 0.875rem;
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast), color var(--duration-fast);
  background: none;
  border: none;
  text-align: left;
}

.lang-option:hover { background: var(--bg-surface-2); color: var(--text-primary); }

.lang-option.active {
  color: var(--color-red);
  font-weight: var(--weight-semibold);
  background: var(--color-red-pale);
}

.lang-flag { font-size: 1.05rem; line-height: 1; width: 22px; text-align: center; }

/* CTA principal */
.navbar__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 44px;
  padding-inline: 22px;
  font-size: 0.875rem;
  font-weight: var(--weight-semibold);
  background: var(--color-red);
  color: #fff;
  border-radius: var(--radius-full);
  transition: var(--transition-base);
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(212, 35, 35, 0.32);
}

.navbar__cta:hover {
  background: var(--color-red-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(212, 35, 35, 0.42);
}

.navbar__cta:active { transform: translateY(0); }

.navbar__cta svg {
  width: 15px; height: 15px;
  transition: transform var(--duration-base) var(--ease-smooth);
}

.navbar__cta:hover svg { transform: translateX(3px); }

/* Burger */
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  transition: background var(--duration-fast), border-color var(--duration-fast);
  cursor: pointer;
}

.menu-toggle:hover { background: var(--bg-overlay); border-color: var(--border-mid); }
.menu-toggle svg { width: 22px; height: 22px; }

/* Spacer compensant le header fixe */
.header-spacer {
  height: calc(var(--topbar-height) + var(--navbar-height));
}

/* ─────────────────────────────────────────────
   MENU MOBILE
───────────────────────────────────────────── */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 11, 30, 0.55);
  backdrop-filter: blur(3px);
  z-index: calc(var(--z-sticky) + 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-base), visibility var(--duration-base);
}

.menu-overlay.open { opacity: 1; visibility: visible; }

.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(360px, 90vw);
  background: var(--bg-surface);
  z-index: calc(var(--z-sticky) + 2);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-smooth);
  overflow-y: auto;
}

.mobile-menu.open { transform: translateX(0); }

.mobile-menu__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-light);
}

.mobile-menu__close {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: background var(--duration-fast);
}

.mobile-menu__close:hover { background: var(--bg-surface-2); }
.mobile-menu__close svg { width: 20px; height: 20px; }

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  gap: 2px;
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  font-size: 1rem;
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast), color var(--duration-fast);
}

.mobile-menu__link svg { width: 16px; height: 16px; opacity: 0.4; }

.mobile-menu__link:hover,
.mobile-menu__link.active {
  background: var(--color-red-pale);
  color: var(--color-red);
}

.mobile-menu__link.active svg { opacity: 1; }

.mobile-menu__footer {
  margin-top: auto;
  padding: var(--space-6);
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-menu__footer .btn { width: 100%; justify-content: center; }

.mobile-menu__contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.mobile-menu__contact a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.mobile-menu__contact svg { width: 15px; height: 15px; color: var(--color-red); }

/* ─────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────── */
@media (max-width: 1100px) {
  .navbar__nav  { display: none; }
  .navbar__cta  { display: none; }
  .menu-toggle  { display: flex; }
}

@media (max-width: 768px) {
  .topbar__group--secondary { display: none; }
  .topbar__inner { justify-content: center; }
}

@media (max-width: 560px) {
  .navbar__logo-sub { display: none; }
  .topbar { display: none; }
  .header-spacer { height: var(--navbar-height); }
}