/* ==========================================================================
   PRISM UI - REUSABLE COMPONENT LIBRARY
   Core styles for buttons, inputs, cards, badges, tabs, and modals
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. BUTTONS (.btn)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  padding: 0.625rem 1.125rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Variants */
.btn-primary {
  background-color: var(--color-primary-600);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.25);
}

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

.btn-secondary {
  background-color: var(--bg-surface-subtle);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--color-gray-200);
  border-color: var(--color-gray-300);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

.btn-outline:hover {
  background-color: var(--color-primary-50);
}

[data-theme="dark"] .btn-outline:hover {
  background-color: rgba(37, 99, 235, 0.15);
}

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

.btn-ghost:hover {
  background-color: var(--bg-surface-subtle);
}

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

.btn-danger:hover {
  background-color: #b91c1c;
}

/* Button Sizes */
.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.875rem 1.5rem;
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
}

/* Button Loading Spinner */
.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn-loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin: -8px 0 0 -8px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
  color: #ffffff;
}

.btn-secondary.btn-loading::after,
.btn-ghost.btn-loading::after {
  color: var(--text-main);
}

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

/* --------------------------------------------------------------------------
   2. INPUT FIELDS & FORM GROUPS
   -------------------------------------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
  margin-bottom: var(--space-4);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-main);
}

.form-label .required {
  color: var(--color-danger);
  margin-left: 2px;
}

.input-control {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--text-main);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-control:hover {
  border-color: var(--color-gray-400);
}

.input-control:focus {
  border-color: var(--color-primary-600);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

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

/* Validation States */
.form-group.has-error .input-control {
  border-color: var(--color-danger);
}

.form-group.has-error .input-control:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

.form-group.has-success .input-control {
  border-color: var(--color-success);
}

.form-helper {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.form-error-msg {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  font-weight: var(--font-weight-medium);
  display: none;
}

.form-group.has-error .form-error-msg {
  display: block;
}

/* --------------------------------------------------------------------------
   3. CARDS (.card)
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-300);
}

.card-header {
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-top: 2px;
}

/* Metric / Stat Card */
.stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.stat-change {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.stat-change.positive { color: var(--color-success); }
.stat-change.negative { color: var(--color-danger); }

/* --------------------------------------------------------------------------
   4. BADGES & PILLS (.badge)
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  line-height: 1;
}

.badge-primary {
  background-color: var(--color-primary-50);
  color: var(--color-primary-700);
}

[data-theme="dark"] .badge-primary {
  background-color: rgba(37, 99, 235, 0.2);
  color: var(--color-primary-300);
}

.badge-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.badge-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-danger {
  background-color: var(--color-danger-bg);
  color: var(--color-danger);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

/* --------------------------------------------------------------------------
   5. TABS / SEGMENTED CONTROL (.tabs)
   -------------------------------------------------------------------------- */
.tabs-container {
  display: flex;
  background-color: var(--bg-surface-subtle);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  width: fit-content;
}

.tab-btn {
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  background-color: var(--bg-surface);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  font-weight: var(--font-weight-semibold);
}

/* --------------------------------------------------------------------------
   6. MODAL DIALOG (.modal)
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: var(--space-4);
}

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

.modal-content {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  max-width: 520px;
  width: 100%;
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-main);
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.modal-body {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* --------------------------------------------------------------------------
   7. TOAST NOTIFICATIONS (.toast)
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 2000;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background-color: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  transform: translateY(20px);
  opacity: 0;
  transition: all var(--transition-normal);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}