:root {
  --primary-color: #6affdc;
  --primary-hover: #242625;
  --secondary-color: #6b7280;
  --secondary-hover: #4b5563;
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --success-color: #8FDFBA;
  --warning-color: #f59e0b;
  --background: #141615;
  --surface: #1f2937;
  --border: #374151;
  --text-primary: white;
  --text-secondary: #c9c9c9;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius: 0.5rem;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.header-logo {
  height: 2rem;
  width: auto;
}

.header-separator {
  width: 1px;
  height: 2rem;
  background-color: var(--border);
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.header-actions {
  display: flex;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s ease-out;
  text-decoration: none;
  contain: layout style;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #111827;
  transition: opacity 0.2s ease-out;
}

.btn-primary:hover {
  opacity: 0.8;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
  transition: background-color 0.2s ease-out;
}

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

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

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

.btn-small {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.icon {
  width: 1.25rem;
  height: 1.25rem;
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: var(--background);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.modal-large {
  max-width: 900px;
}

.modal-small {
  max-width: 460px;
}

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

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

.close-btn {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0;
  transition: background-color 0.2s ease-out, color 0.2s ease-out;
}

.close-btn:hover {
  background-color: var(--surface);
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 1rem 1.5rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
  z-index: 2000;
  will-change: transform, opacity;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  border-color: var(--success-color);
  color: var(--success-color);
}

.toast.error {
  border-color: var(--danger-color);
  color: var(--danger-color);
}

.toast.warning {
  border-color: var(--warning-color);
  color: var(--warning-color);
}

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

.text-danger {
  color: var(--danger-color);
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: var(--background);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius);
  z-index: 9999;
  font-weight: 600;
}

.skip-link:focus {
  top: 6px;
}

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

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--surface);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.2s ease-out, box-shadow 0.2s ease-out;
  contain: layout;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-help {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

/* Responsive adjustments */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .header-left {
    flex-direction: column;
    gap: 0.75rem;
  }

  .header-separator {
    width: 2rem;
    height: 1px;
  }

  .modal-content {
    width: 95%;
    margin: 1rem;
  }
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border: #ffffff;
    --text-secondary: #ffffff;
  }
}