:root {
  /* Colors - Premium SaaS Aesthetic */
  --bg-color: #f4f7fb; 
  --surface-color: #ffffff;
  --text-primary: #1e293b; 
  --text-secondary: #64748b; 
  --text-muted: #94a3b8;
  
  --primary-color: #6366f1; 
  --primary-hover: #4f46e5; 
  --primary-light: #e0e7ff; 
  
  --success-color: #10b981;
  --success-light: #d1fae5;
  --warning-color: #f59e0b;
  --warning-light: #fef3c7;
  --danger-color: #ef4444;
  --danger-light: #fee2e2;
  --border-color: #e2e8f0; 

  /* Soft Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 15px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  
  /* Borders & Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
}

/* Layouts */
.auth-bg {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background-color: var(--bg-color);
}

.dashboard-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--surface-color);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  z-index: 50;
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.sidebar-header {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--primary-color);
  letter-spacing: -0.025em;
}

.sidebar-close {
  display: none;
  color: var(--text-secondary);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.25rem;
}

.sidebar-nav {
  padding: 1.5rem 1rem;
  flex: 1;
  overflow-y: auto;
}

.nav-section {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  margin-top: 1.5rem;
  padding-left: 0.75rem;
}

.nav-section:first-child {
  margin-top: 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  margin-bottom: 0.25rem;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

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

.nav-item.active {
  background-color: var(--primary-light);
  color: var(--primary-color);
  font-weight: 600;
}

/* Sidebar Overlay */
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(2px);
  z-index: 40;
  display: none;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.sidebar-overlay.show {
  display: block;
  opacity: 1;
}

/* Main Content Wrapper */
.main-wrapper {
  flex: 1;
  margin-left: 260px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--transition-normal);
}

/* Topbar */
.topbar {
  height: 70px;
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 30;
  box-shadow: 0 1px 2px 0 rgba(0,0,0,0.02);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hamburger-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.hamburger-btn:hover {
  background-color: var(--bg-color);
  color: var(--text-primary);
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
}

.search-input {
  padding: 0.5rem 1rem 0.5rem 2.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background-color: var(--bg-color);
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--text-primary);
  width: 250px;
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  background-color: var(--surface-color);
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
  width: 300px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.notification-btn {
  position: relative;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.notification-btn:hover {
  background-color: var(--bg-color);
  color: var(--text-primary);
}

.notification-badge {
  position: absolute;
  top: 0;
  right: 0;
  width: 8px;
  height: 8px;
  background-color: var(--danger-color);
  border-radius: 50%;
  border: 2px solid var(--surface-color);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.user-avatar {
  width: 36px;
  height: 36px;
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
}

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

.user-name {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.2;
}

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

/* Content Area */
.content-area {
  padding: 2rem;
  flex: 1;
}

/* Page Header */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

/* Components */
.card {
  background-color: var(--surface-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(226, 232, 240, 0.8);
  padding: 1.5rem;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.metric-card {
  display: flex;
  flex-direction: column;
}

.metric-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.metric-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.metric-icon {
  padding: 0.5rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.metric-icon.primary { background-color: var(--primary-light); color: var(--primary-color); }
.metric-icon.success { background-color: var(--success-light); color: var(--success-color); }
.metric-icon.warning { background-color: var(--warning-light); color: var(--warning-color); }
.metric-icon.danger { background-color: var(--danger-light); color: var(--danger-color); }

.metric-value {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.metric-trend {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.metric-trend.up { color: var(--success-color); }
.metric-trend.down { color: var(--danger-color); }
.metric-trend.neutral { color: var(--text-secondary); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  font-family: inherit;
  font-size: 0.875rem;
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
  box-shadow: none;
}

.btn-outline:hover {
  background-color: var(--bg-color);
  border-color: var(--text-secondary);
}

.btn-block {
  width: 100%;
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  background-color: var(--surface-color);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Utilities */
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.text-center { text-align: center; }
.text-danger { color: var(--danger-color); }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* Responsive Grid */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

/* Mobile Adjustments */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .sidebar-close {
    display: block;
  }
  .main-wrapper {
    margin-left: 0;
  }
  .topbar {
    padding: 0 1rem;
  }
  .hamburger-btn {
    display: block;
  }
  .search-input {
    display: none;
  }
  .search-icon {
    display: none;
  }
  .content-area {
    padding: 1.5rem 1rem;
  }
  .user-info {
    display: none;
  }
}