/* ========================================
   SIDEBAR - Tree Navigation
   ======================================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 260px;
  background-color: var(--color-bg);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  z-index: 200;
  padding-top: calc(3.5rem + env(safe-area-inset-top, 0));
  padding-bottom: 2rem;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
}

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

/* Desktop: always visible */
@media (min-width: 1024px) {
  .sidebar {
    transform: translateX(0);
  }
}

/* Prevent body scroll when sidebar open on mobile */
@media (max-width: 1023px) {
  body.sidebar-open {
    overflow: hidden;
  }

  body.sidebar-open .app-main {
    pointer-events: none;
  }
}

/* Overlay (mobile only) */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  z-index: 199;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

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

@media (min-width: 1024px) {
  .sidebar-overlay {
    display: none;
  }
}

/* Nav structure */
.sidebar-nav {
  padding: var(--spacing-sm);
}

/* Sections */
.sidebar-section {
  margin-bottom: var(--spacing-sm);
}

.sidebar-heading {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Items */
.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.625rem var(--spacing-sm);
  padding-left: 1.5rem;
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease;
  cursor: pointer;
  min-height: 2.75rem; /* touch-friendly minimum */
}

.sidebar-item:hover {
  background-color: var(--color-bg-secondary);
}

.sidebar-item--active {
  background-color: var(--color-primary);
  color: white;
}

.sidebar-item--active:hover {
  background-color: var(--color-primary-hover);
}

.sidebar-item--locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.sidebar-item--dashboard {
  padding-left: var(--spacing-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

/* Icons & Labels */
.sidebar-icon {
  flex-shrink: 0;
  width: 1.25rem;
  text-align: center;
}

.sidebar-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-status {
  flex-shrink: 0;
  font-size: 0.75rem;
}

/* Mobile sidebar enhancements */
@media (max-width: 1023px) {
  .sidebar {
    width: min(280px, 85vw);
    box-shadow: var(--shadow-lg);
    padding-bottom: calc(3rem + env(safe-area-inset-bottom, 0));
  }

  .sidebar-item {
    min-height: 3rem;
    padding: 0.75rem var(--spacing-sm);
    padding-left: 1.5rem;
  }

  .sidebar-heading {
    padding: var(--spacing-sm);
  }
}