/* Cash App-level Premium UI Kit */
:root {
  --primary: #00D4AA;
  --primary-dark: #00B894;
  --secondary: #6366F1;
  --background: #000000;
  --surface: #1A1A1A;
  --surface-light: #2A2A2A;
  --text: #FFFFFF;
  --text-secondary: #9CA3AF;
  --border: #374151;
  --error: #EF4444;
  --warning: #F59E0B;
  --success: #10B981;
  --radius: 12px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --background: #FFFFFF;
  --surface: #F9FAFB;
  --surface-light: #F3F4F6;
  --text: #111827;
  --text-secondary: #6B7280;
  --border: #E5E7EB;
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  min-height: 44px;
  position: relative;
  overflow: hidden;
}

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

.btn-primary {
  background: var(--primary);
  color: #000;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--surface-light);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--surface-light);
  color: var(--text);
}

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

.btn-danger:hover:not(:disabled) {
  background: #DC2626;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 12px;
  min-height: 36px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
  min-height: 52px;
}

/* Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(0, 212, 170, 0.1);
}

.card-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.card-body {
  padding: 20px;
}

.card-footer {
  padding: 20px;
  border-top: 1px solid var(--border);
  background: var(--surface-light);
}

/* Inputs */
.input-group {
  margin-bottom: 16px;
}

.input-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 14px;
  color: var(--text);
}

.input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  transition: var(--transition);
  min-height: 44px;
}

.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.1);
}

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

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

.input-error {
  color: var(--error);
  font-size: 12px;
  margin-top: 4px;
}

/* Tabs */
.tabs {
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab-list {
  display: flex;
  gap: 4px;
  overflow-x: auto;
}

.tab-button {
  padding: 12px 20px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  font-weight: 500;
}

.tab-button:hover {
  color: var(--text);
  background: var(--surface-light);
}

.tab-button.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
  transform: scale(0.9);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--surface-light);
  color: var(--text);
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  padding: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* Toasts */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  min-width: 300px;
  max-width: 400px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transform: translateX(100%);
  transition: var(--transition);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.toast.show {
  transform: translateX(0);
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.toast-message {
  font-size: 14px;
  color: var(--text-secondary);
}

.toast-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: var(--transition);
}

.toast-close:hover {
  background: var(--surface-light);
}

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

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

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

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

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

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

/* Utility classes */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-2 {
  gap: 8px;
}

.gap-4 {
  gap: 16px;
}

.mb-4 {
  margin-bottom: 16px;
}

.mt-4 {
  margin-top: 16px;
}

.text-center {
  text-align: center;
}

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

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .modal {
    max-width: 95vw;
    margin: 20px;
  }
  
  .toast-container {
    left: 16px;
    right: 16px;
  }
  
  .toast {
    min-width: auto;
    max-width: none;
  }
}