:root {
  /* Color Palette - Modern & Vibrant */
  --primary-hue: 250;
  --primary-sat: 85%;
  --primary-light: 55%;
  --primary: hsl(var(--primary-hue), var(--primary-sat), var(--primary-light));
  --primary-dark: hsl(var(--primary-hue), var(--primary-sat), 45%);
  --primary-light-bg: hsl(var(--primary-hue), var(--primary-sat), 95%);
  
  --accent-hue: 320;
  --accent: hsl(var(--accent-hue), 75%, 60%);
  --accent-gradient: linear-gradient(135deg, 
    hsl(var(--primary-hue), 80%, 60%), 
    hsl(var(--accent-hue), 75%, 60%)
  );
  
  /* Dark Mode Colors */
  --bg-primary: #0a0b0f;
  --bg-secondary: #141620;
  --bg-tertiary: #1c1e2b;
  --bg-card: rgba(28, 30, 43, 0.8);
  
  --text-primary: #e8eaed;
  --text-secondary: #9aa0b0;
  --text-muted: #6b7280;
  
  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.2);
  
  /* Success/Error Colors */
  --success: hsl(142, 76%, 50%);
  --error: hsl(0, 84%, 60%);
  --warning: hsl(38, 92%, 50%);
  
  /* Shadows & Effects */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --glow-primary: 0 0 20px hsla(var(--primary-hue), 85%, 55%, 0.3);
  
  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Background Gradient Animation */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, 
    hsla(var(--primary-hue), 60%, 40%, 0.15) 0%,
    transparent 70%
  );
  animation: gradientShift 20s ease infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes gradientShift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-20%, -20%) scale(1.2); }
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

/* Login Screen */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-lg);
}

.login-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.4s var(--transition-normal);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-card h1 {
  font-size: 2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
  text-align: center;
}

.login-card p {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Section */
.section {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Form Styles */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

input, select, textarea {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px hsla(var(--primary-hue), 85%, 55%, 0.15);
}

input::placeholder {
  color: var(--text-muted);
}

/* Buttons */
.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  outline: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-primary), var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

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

.btn-danger:hover {
  background: hsl(0, 84%, 50%);
  box-shadow: 0 0 20px hsla(0, 84%, 60%, 0.3);
}

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

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.8125rem;
}

/* Search & Filter */
.search-filter {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.search-filter input {
  flex: 1;
  min-width: 200px;
}

.filter-group {
  display: flex;
  gap: var(--spacing-sm);
}

/* Table */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

thead {
  background: var(--bg-tertiary);
  border-bottom: 2px solid var(--border-color);
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

tbody tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: var(--bg-tertiary);
}

tbody tr:last-child td {
  border-bottom: none;
}

.license-key {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--bg-tertiary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* Badge */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-success {
  background: hsla(142, 76%, 50%, 0.15);
  color: var(--success);
  border: 1px solid var(--success);
}

.badge-danger {
  background: hsla(0, 84%, 60%, 0.15);
  color: var(--error);
  border: 1px solid var(--error);
}

.badge-info {
  background: hsla(var(--primary-hue), 85%, 55%, 0.15);
  color: var(--primary);
  border: 1px solid var(--primary);
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Alert Messages */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  animation: slideIn 0.3s var(--transition-normal);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert-success {
  background: hsla(142, 76%, 50%, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.alert-error {
  background: hsla(0, 84%, 60%, 0.1);
  border-color: var(--error);
  color: var(--error);
}

.alert-info {
  background: hsla(var(--primary-hue), 85%, 55%, 0.1);
  border-color: var(--primary);
  color: var(--primary);
}

/* Hidden */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .header {
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: flex-start;
  }
  
  .header-actions {
    width: 100%;
    flex-direction: column;
  }
  
  .header-actions .btn {
    width: 100%;
  }
  
  .search-filter {
    flex-direction: column;
  }
  
  .search-filter input {
    min-width: 100%;
  }
  
  .table-container {
    font-size: 0.8125rem;
  }
  
  th, td {
    padding: var(--spacing-sm);
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-md); }
.gap-sm { gap: var(--spacing-sm); }