/* ================= NAVBAR ================= */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 255px;
  height: 100vh;
  padding: var(--spacing-xxl) var(--spacing-md) var(--spacing-md);
  background: var(--color-bg-secondary);
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-right: var(--border);
  transition:
    width 0.3s ease,
    padding 0.3s ease;
  z-index: 1000;
  overflow-x: hidden;
  overflow-y: auto;
}

.main-nav.collapsed {
  width: 60px;
  padding: var(--spacing-xxl) 0 var(--spacing-md);
}

.main-nav.collapsed .nav-content {
  opacity: 0;
  transition: opacity 0.2s ease;
}

/* ================= BOUTON DE REPLI ================= */
.nav-collapse-btn {
  position: absolute;
  top: 10px;
  right: 0;
  width: 20px;
  height: 40px;
  background: var(--color-bg-secondary);
  color: var(--color-text-tertiary);
  border: none;
  border-right: var(--border);
  border-top-left-radius: var(--border-radius);
  border-bottom-left-radius: var(--border-radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9em;
  transition:
    background 0.3s ease,
    color 0.3s ease;
  z-index: 1001;
}

.main-nav.collapsed .nav-collapse-btn {
  background: var(--color-bg-tertiary);
  color: var(--color-accent);
}

.nav-collapse-btn:hover {
  background: var(--color-border);
  color: var(--color-text-primary);
}

/* ================= CONTENU ================= */
.nav-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: opacity 0.3s ease;
}

.main-nav a,
.main-nav span {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition:
    background 0.2s ease,
    color 0.2s ease,
    transform 0.2s ease;
  letter-spacing: 0.02em;
}

.main-nav a:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  transform: translateX(3px);
}

.main-nav span {
  color: var(--color-text-quaternary);
  cursor: default;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding-top: var(--spacing-md);
}

/* ================= MENU DÉROULANT ================= */
.nav-dropdown-toggle {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text-tertiary);
  text-align: left;
  font-size: var(--font-size-sm);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: var(--border-radius);
  transition:
    background 0.2s ease,
    color 0.2s ease;
  font-family: var(--font-family-base);
  letter-spacing: 0.02em;
}

.nav-dropdown-toggle:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.dropdown-icon {
  transition: transform 0.2s ease;
  font-size: 0.75em;
  color: var(--color-text-quaternary);
}

.nav-dropdown-toggle[aria-expanded="true"] .dropdown-icon {
  transform: rotate(180deg);
}

.nav-dropdown-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: var(--color-bg-primary);
  border-radius: var(--border-radius);
  margin: 2px var(--spacing-sm);
  border: var(--border);
}

.nav-dropdown-content a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.nav-dropdown-content a:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.nav-dropdown-toggle[aria-expanded="true"] + .nav-dropdown-content {
  max-height: 300px;
}

/* ================= SÉPARATEURS ================= */
.nav-separator {
  border: none;
  border-top: var(--border);
  margin: var(--spacing-sm) 0;
  opacity: 0.4;
}

/* ================= MOBILE ================= */
@media (max-width: 900px) {
  .main-nav {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: var(--border);
    padding: var(--spacing-sm);
    overflow-x: visible;
    overflow-y: visible;
  }

  .main-nav.collapsed {
    width: 100%;
    height: auto;
    padding: var(--spacing-sm);
  }
  .main-nav.collapsed .nav-content {
    display: none;
  }

  .nav-collapse-btn {
    position: relative;
    right: auto;
    top: auto;
    margin: 0 auto var(--spacing-sm);
    border-radius: var(--border-radius);
    border: var(--border);
    width: 100%;
    height: auto;
    padding: var(--spacing-sm);
    justify-content: center;
  }

  .nav-collapse-btn::before {
    content: "☰ Menu";
    margin-right: var(--spacing-sm);
  }
}