/* ===================================
   Global Styles & CSS Variables
   =================================== */
:root {
  --primary-color: #E4002B;
  --primary-hover: #C41E3A;
  --secondary-color: #454545;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
  --danger-color: #F44336;
  --info-color: #2196F3;
  
  --text-primary: #212121;
  --text-secondary: #757575;
  --text-muted: #9E9E9E;
  
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --bg-tertiary: #FAFAFA;
  
  --border-color: #E0E0E0;
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --border-radius-lg: 12px;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;
  
  --transition: all 0.2s ease;
}

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

html {
  font-size: 16px;
  height: 100%;
}

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

/* ===================================
   Screen Management
   =================================== */
.screen {
  display: none;
  min-height: 100vh;
}

.screen.active {
  display: block;
}

/* ===================================
   Login Screen
   =================================== */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
}

.login-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-xl);
  width: 100%;
  max-width: 400px;
  animation: slideUp 0.3s ease;
}

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

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.login-card h2 {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.login-footer {
  margin-top: var(--spacing-lg);
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===================================
   Dashboard Layout
   =================================== */
.dashboard-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-xl);
  max-width: 1400px;
  margin: 0 auto;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-small {
  display: flex;
  align-items: center;
}

.header-left h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-weight: 500;
}

.user-icon {
  font-size: 1.2rem;
}

.dashboard-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

/* ===================================
   Stats Section
   =================================== */
.stats-section {
  margin-bottom: var(--spacing-xl);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.stat-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  transition: var(--transition);
}

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

.stat-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-content {
  flex: 1;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===================================
   Actions Bar
   =================================== */
.actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.actions-right {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.search-box {
  position: relative;
  width: 300px;
}

.search-box input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  padding-right: 40px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  transition: var(--transition);
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(228, 0, 43, 0.1);
}

.search-box svg {
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  background: var(--bg-primary);
  cursor: pointer;
  transition: var(--transition);
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(228, 0, 43, 0.1);
}

/* ===================================
   Table Styles
   =================================== */
.licenses-section {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.table-container {
  overflow-x: auto;
}

.licenses-table {
  width: 100%;
  border-collapse: collapse;
}

.licenses-table thead {
  background: var(--bg-secondary);
}

.licenses-table th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.licenses-table td {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.licenses-table tbody tr {
  transition: var(--transition);
}

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

.table-empty {
  text-align: center;
  padding: var(--spacing-xl) !important;
  color: var(--text-muted);
}

.license-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  display: inline-block;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-badge.active {
  background: rgba(76, 175, 80, 0.1);
  color: var(--success-color);
}

.status-badge.pending {
  background: rgba(255, 152, 0, 0.1);
  color: var(--warning-color);
}

.status-badge.revoked {
  background: rgba(244, 67, 54, 0.1);
  color: var(--danger-color);
}

.status-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.table-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-primary:focus {
  box-shadow: 0 0 0 3px rgba(228, 0, 43, 0.2);
}

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

.btn-secondary:hover:not(:disabled) {
  background: #333333;
}

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

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

.btn-danger:hover:not(:disabled) {
  background: #D32F2F;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8125rem;
}

.btn-block {
  width: 100%;
}

.btn-loading [class^="btn-"] {
  display: none;
}

.btn.loading .btn-text {
  display: none;
}

.btn.loading .btn-loading {
  display: inline;
}

/* ===================================
   Forms
   =================================== */
.form-group {
  margin-bottom: var(--spacing-md);
}

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

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-family: var(--font-family);
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(228, 0, 43, 0.1);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.error-message {
  display: none;
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(244, 67, 54, 0.1);
  border: 1px solid var(--danger-color);
  border-radius: var(--border-radius);
  color: var(--danger-color);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.error-message.show {
  display: block;
}

/* ===================================
   Modal
   =================================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  position: relative;
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
  z-index: 1;
}

.modal-large {
  max-width: 800px;
}

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

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal form {
  padding: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
}

/* ===================================
   Loading Spinner
   =================================== */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

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

/* ===================================
   Toast Notifications
   =================================== */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-width: 400px;
}

.toast {
  padding: var(--spacing-md);
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.success {
  border-left: 4px solid var(--success-color);
}

.toast.error {
  border-left: 4px solid var(--danger-color);
}

.toast.info {
  border-left: 4px solid var(--info-color);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  font-size: 0.875rem;
}

.toast-message {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

/* ===================================
   License Details
   =================================== */
.detail-grid {
  display: grid;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

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

.detail-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.detail-value {
  font-size: 0.875rem;
  color: var(--text-primary);
}

.detail-value.mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  display: inline-block;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .dashboard-main {
    padding: var(--spacing-md);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .actions-bar {
    flex-direction: column;
    align-items: stretch;
  }
  
  .actions-right {
    flex-direction: column;
  }
  
  .search-box {
    width: 100%;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .header-content {
    padding: var(--spacing-md);
  }
  
  .header-left h1 {
    font-size: 1rem;
  }
  
  .user-info {
    display: none;
  }
}

/* ===================================
   Accessibility
   =================================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}