:root {
  --sidebar-width: 260px;
  --header-height: 70px;
  --primary-color: #6366f1; /* Indigo */
  --primary-hover: #4f46e5;
  --bg-dark: #111827; /* Rich dark */
  --bg-card: #1f2937;
  --bg-hover: #374151;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --border-color: #374151;
  --status-online: #10b981;
  --accent-purple: #8b5cf6;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  display: flex;
  min-h-screen: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--bg-dark);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 100;
  transition: all 0.3s ease;
}

.sidebar-header {
  height: var(--header-height);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.logo-box {
  width: 32px;
  height: 32px;
  background-color: var(--primary-color);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.user-profile {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--primary-color);
  background: var(--bg-hover);
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.user-role {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem 0.75rem;
}

.nav-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin: 1.5rem 0.75rem 0.75rem;
  letter-spacing: 1px;
}

.nav-group {
  margin-bottom: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0.625rem 0.75rem;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s;
  cursor: pointer;
}

.nav-link i {
  width: 20px;
  margin-right: 0.75rem;
  font-size: 1.1rem;
}

.nav-link:hover, .nav-link.active {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.nav-link.has-child {
  justify-content: space-between;
}

.chevron {
  font-size: 0.75rem;
  transition: transform 0.2s;
}

.group-children {
  display: none;
  padding-left: 1.5rem;
  margin-top: 0.25rem;
}

.group-children.open {
  display: block;
}

.nav-link.group-active .chevron {
  transform: rotate(90deg);
}

/* Main Content */
.main-layout {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.header {
  height: var(--header-height);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-dark);
  border-bottom: 1px solid var(--border-color);
}

.search-bar {
  flex: 1;
  max-width: 400px;
  position: relative;
}

.search-bar input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem 0.5rem 2.5rem;
  border-radius: 20px;
  color: var(--text-primary);
  outline: none;
}

.header-icons {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: var(--text-secondary);
}

.content-area {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.card {
  background-color: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: transform 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-color);
}

.card-title {
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-value {
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: 0.5rem;
}

.card-subtext {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}