/* ================================================
   Sidebar Navigation
   ================================================ */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sticky);
  transition: width var(--transition-panel), transform var(--transition-panel);
  overflow: hidden;
}

/* Logo Area */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  height: var(--topbar-height);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.sidebar-logo .logo-text {
  font-size: var(--text-md);
  font-weight: var(--weight-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

/* Nav Items */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3) var(--space-3);
}

.nav-section {
  margin-bottom: var(--space-4);
}

.nav-section-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
  white-space: nowrap;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
}

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

.nav-item.active {
  background: var(--accent-primary-light);
  color: var(--accent-primary);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent-primary);
  border-radius: 0 2px 2px 0;
}

.nav-item .nav-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.nav-item .nav-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-item .nav-badge {
  margin-left: auto;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--space-3);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
}

.sidebar-user:hover {
  background: var(--bg-tertiary);
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.sidebar-user-name {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-plan {
  font-size: var(--text-xs);
  color: var(--accent-gold);
}

/* Collapse Toggle */
.sidebar-toggle {
  position: absolute;
  top: 50%;
  right: -12px;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-muted);
  transition: all var(--transition-base);
  z-index: 10;
  opacity: 0;
}

.sidebar:hover .sidebar-toggle {
  opacity: 1;
}

.sidebar-toggle:hover {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

/* Collapsed State */
.sidebar-collapsed .sidebar {
  width: var(--sidebar-collapsed);
}

.sidebar-collapsed .logo-text,
.sidebar-collapsed .nav-section-label,
.sidebar-collapsed .nav-label,
.sidebar-collapsed .nav-badge,
.sidebar-collapsed .sidebar-user-info {
  display: none;
}

.sidebar-collapsed .sidebar-logo {
  justify-content: center;
  padding: var(--space-4);
}

.sidebar-collapsed .nav-item {
  justify-content: center;
  padding: var(--space-3);
}

.sidebar-collapsed .sidebar-user {
  justify-content: center;
}

/* Mobile Overlay */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: calc(var(--z-sticky) - 1);
  backdrop-filter: blur(4px);
}

/* Mobile hamburger */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
  padding: var(--space-2);
}