.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 200;
  transition: width 0.3s, transform 0.3s;
  display: flex;
  flex-direction: column;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 16px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-card);
  z-index: 1;
}

.logo { width: 32px; height: 32px; object-fit: contain; }

.brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
  flex: 1;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
}

.sidebar-nav { padding: 12px 0; flex: 1; }

.nav-section { margin-bottom: 8px; }

.nav-section-title {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  padding: 12px 16px 4px;
  font-weight: 600;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
  border-left: 3px solid transparent;
  white-space: nowrap;
  overflow: hidden;
}

.nav-item:hover {
  background: var(--bg-card2);
  color: var(--text-main);
  border-left-color: var(--primary);
}

.nav-item.active {
  background: rgba(255,230,0,0.08);
  color: var(--primary);
  border-left-color: var(--primary);
}

.nav-item i {
  font-size: 15px;
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

/* Collapsed sidebar */
.sidebar.collapsed {
  width: 60px;
}
.sidebar.collapsed .brand-name,
.sidebar.collapsed .nav-section-title,
.sidebar.collapsed .nav-item span {
  display: none;
}
.sidebar.collapsed .nav-item {
  justify-content: center;
  padding: 12px;
}
.sidebar.collapsed ~ .main-content {
  margin-left: 60px;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0 !important;
  }
  .overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 150;
  }
  .overlay.active { display: block; }
}