/* ===============================
   SIDEBAR NAVIGATION
   Lateral — expands on hover
   =============================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width-collapsed);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  transition: width 0.35s var(--ease-out-expo);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.sidebar:hover,
.sidebar.sidebar--open {
  width: var(--sidebar-width-expanded);
}

/* Brand */
.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  min-height: 64px;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar__brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.sidebar__brand-text {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-primary-dark);
  opacity: 0;
  transform: translateX(-8px);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease;
  white-space: nowrap;
}

.sidebar:hover .sidebar__brand-text,
.sidebar.sidebar--open .sidebar__brand-text {
  opacity: 1;
  transform: translateX(0);
}

/* Nav links */
.sidebar__nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xs);
  padding: var(--spacing-md) var(--spacing-xs);
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-sm);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition:
    background 0.2s ease,
    color 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
  cursor: pointer;
  min-height: 48px;
  text-decoration: none;
}

.sidebar__link:hover {
  background: var(--color-background-alt);
  color: var(--color-primary-dark);
}

.sidebar__link--active {
  background: var(--color-background-alt);
  color: var(--color-primary-dark);
  font-weight: var(--font-weight-semibold);
}

.sidebar__link-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 18px;
  pointer-events: none;
}

.sidebar__link-text {
  pointer-events: none;
}

.sidebar__link-text {
  opacity: 0;
  transform: translateX(-8px);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease;
  white-space: nowrap;
}

.sidebar:hover .sidebar__link-text,
.sidebar.sidebar--open .sidebar__link-text {
  opacity: 1;
  transform: translateX(0);
}

/* Footer / branding at bottom */
.sidebar__footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

.sidebar__footer-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity 0.25s ease;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar:hover .sidebar__footer-text,
.sidebar.sidebar--open .sidebar__footer-text {
  opacity: 1;
}

/* ── Mobile: bottom toggle button ── */
.sidebar__mobile-toggle {
  display: none;
  position: fixed;
  bottom: var(--spacing-lg);
  left: var(--spacing-lg);
  z-index: 1001;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--gradient-accent);
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  font-size: 20px;
  transition: transform 0.3s var(--ease-spring);
}

.sidebar__mobile-toggle:hover {
  transform: scale(1.1);
}

/* ── Mobile overlay ── */
.sidebar__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 999;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar__overlay--visible {
  opacity: 1;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width-expanded);
    transition: transform 0.35s var(--ease-out-expo);
  }

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

  .sidebar:hover {
    width: var(--sidebar-width-expanded);
    transform: translateX(-100%);
  }

  .sidebar.sidebar--open:hover {
    transform: translateX(0);
  }

  .sidebar.sidebar--open .sidebar__link-text,
  .sidebar.sidebar--open .sidebar__brand-text,
  .sidebar.sidebar--open .sidebar__footer-text {
    opacity: 1;
    transform: translateX(0);
  }

  .sidebar__mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .sidebar__overlay {
    display: block;
    pointer-events: none;
  }

  .sidebar__overlay--visible {
    pointer-events: auto;
  }

  /* Bigger touch targets on mobile */
  .sidebar__link {
    min-height: 56px;
    padding: var(--spacing-md) var(--spacing-md);
    font-size: var(--font-size-md);
    gap: var(--spacing-md);
  }

  .sidebar__link-icon {
    width: 44px;
    height: 44px;
    font-size: 22px;
  }

  .sidebar__nav {
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
  }
}