/* ==================== TOPBAR ==================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 32px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--border-subtle);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.topbar__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.topbar__nav {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface);
  padding: 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* ==================== ZONE DE CONTENU ==================== */
.app-root {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 32px 24px calc(var(--bottom-nav-height) + 40px);
  min-height: calc(100dvh - var(--topbar-height));
}

/* ==================== BOTTOM NAV (mobile) ==================== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: space-around;
  height: var(--bottom-nav-height);
  padding-bottom: env(safe-area-inset-bottom, 0);
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-top: 1px solid var(--border-subtle);
}

.bottom-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex: 1;
  padding: 8px 4px;
  color: var(--text-tertiary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.bottom-nav__icon {
  font-size: 1.3rem;
  transition: transform var(--transition-fast);
}

.bottom-nav__label {
  font-size: 0.68rem;
  font-weight: 600;
}

.bottom-nav__item[aria-current="page"] {
  color: var(--accent-secondary);
}

.bottom-nav__item[aria-current="page"] .bottom-nav__icon {
  transform: translateY(-2px) scale(1.1);
}

.bottom-nav__item:active {
  transform: scale(0.92);
}

/* ==================== MODE AUTHENTIFICATION ==================== */
/* Tant que <body> porte cette classe (aucune session active),
   la topbar et la bottom-nav sont masquées et #app-root affiche
   uniquement l'écran de connexion / inscription, centré. */
body.is-auth .topbar,
body.is-auth .bottom-nav {
  display: none;
}

body.is-auth .app-root {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
