/* ==========================================================================
   Component Styles — I4G Integration Tracker
   Buttons, cards, tables, tooltips, badges, modals, progress bars,
   spinners, empty/error states, filter controls.
   Validates: Requirements 17.1, 17.4, 17.7, 10.2
   ========================================================================== */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

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

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.btn--primary:hover:not(:disabled) {
  background-color: #0D47A1;
}

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

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-bg-hover);
}

.btn--danger {
  background-color: var(--color-error);
  color: var(--color-text-inverse);
  border-color: var(--color-error);
}

.btn--danger:hover:not(:disabled) {
  background-color: #B71C1C;
}

.btn--sm {
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-small);
}

/* --- Cards --- */
.card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.card__title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-medium);
}

.card__body {
  font-size: var(--font-size-body);
}

/* --- Tables --- */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-body);
}

.table th,
.table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.table th {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  position: sticky;
  top: 0;
  z-index: 1;
}

.table tr:hover td {
  background-color: var(--color-bg-hover);
}

/* --- Tooltips --- */
.tooltip {
  position: absolute;
  z-index: var(--z-tooltip);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-text-primary);
  color: var(--color-text-inverse);
  font-size: var(--font-size-small);
  line-height: var(--line-height-normal);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  white-space: pre-line;
  pointer-events: none;
  max-width: 250px;
}

/* --- Badges (severity + status) --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge__icon {
  font-size: 0.625rem;
}

/* Severity badges */
.badge--severity-critical {
  background-color: var(--color-severity-critical);
  color: var(--color-text-inverse);
}

.badge--severity-high {
  background-color: var(--color-severity-high);
  color: var(--color-text-inverse);
}

.badge--severity-medium {
  background-color: var(--color-severity-medium);
  color: var(--color-text-primary);
}

.badge--severity-low {
  background-color: var(--color-severity-low);
  color: var(--color-text-inverse);
}

/* Status badges */
.badge--status-not-started {
  background-color: var(--color-status-not-started);
  color: var(--color-text-inverse);
}

.badge--status-in-progress {
  background-color: var(--color-status-in-progress);
  color: var(--color-text-inverse);
}

.badge--status-completed {
  background-color: var(--color-status-completed);
  color: var(--color-text-inverse);
}

.badge--status-blocked {
  background-color: var(--color-status-blocked);
  color: var(--color-text-inverse);
}

.badge--status-rejected {
  background-color: var(--color-status-rejected);
  color: var(--color-text-inverse);
}


/* --- Modals --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal {
  background-color: var(--color-bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-5);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

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

.modal__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
}

.modal__close {
  background: none;
  border: none;
  font-size: var(--font-size-h3);
  cursor: pointer;
  color: var(--color-text-secondary);
  padding: var(--space-1);
}

.modal__close:hover {
  color: var(--color-text-primary);
}

/* --- Progress Bars --- */
.progress-bar {
  position: relative;
  width: 100%;
  height: 8px;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.progress-bar__fill--severity-critical {
  background-color: var(--color-severity-critical);
}

.progress-bar__fill--severity-high {
  background-color: var(--color-severity-high);
}

.progress-bar__fill--severity-medium {
  background-color: var(--color-severity-medium);
}

.progress-bar__fill--severity-low {
  background-color: var(--color-severity-low);
}

.progress-bar__label {
  position: absolute;
  right: 0;
  top: -1.25rem;
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
}

/* --- Spinners --- */
.spinner {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.spinner__circle {
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner--sm .spinner__circle {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.spinner--md .spinner__circle {
  width: 32px;
  height: 32px;
}

.spinner--lg .spinner__circle {
  width: 48px;
  height: 48px;
  border-width: 4px;
}

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

/* --- Empty State --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  text-align: center;
  color: var(--color-text-secondary);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.empty-state__message {
  font-size: var(--font-size-h4);
  max-width: 400px;
}

/* --- Error State --- */
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  text-align: center;
}

.error-state__icon {
  font-size: 3rem;
  color: var(--color-error);
  margin-bottom: var(--space-4);
}

.error-state__message {
  font-size: var(--font-size-h4);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  max-width: 400px;
}

.error-state__retry {
  margin-top: var(--space-2);
}

/* --- Filter Controls --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.filter-group__label {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.filter-group__select {
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-body);
  font-family: var(--font-family);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-surface);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.filter-group__select:focus {
  border-color: var(--color-border-focus);
}

/* ------------------------------------------------------------------ */
/*  Multi-select dropdown                                              */
/* ------------------------------------------------------------------ */

.ms-dropdown {
  position: relative;
}

.ms-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-body);
  font-family: var(--font-family);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-surface);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: border-color var(--transition-fast);
  white-space: nowrap;
  min-width: 100px;
}

.ms-btn:hover,
.ms-dropdown--open .ms-btn {
  border-color: var(--color-border-focus);
}

.ms-btn__label {
  flex: 1;
  text-align: left;
}

.ms-btn__arrow {
  font-size: 10px;
  color: var(--color-text-secondary);
  transition: transform var(--transition-fast);
}

.ms-dropdown--open .ms-btn__arrow {
  transform: rotate(180deg);
}

.ms-panel {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  z-index: 200;
  min-width: 160px;
  max-height: 240px;
  overflow-y: auto;
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  padding: var(--space-1) 0;
}

.ms-dropdown--open .ms-panel {
  display: block;
}

.ms-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-body);
  color: var(--color-text-primary);
  cursor: pointer;
  user-select: none;
}

.ms-option:hover {
  background-color: var(--color-bg-secondary);
}

.ms-option--all {
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-1);
  padding-bottom: var(--space-2);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.ms-option__check {
  flex-shrink: 0;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* ------------------------------------------------------------------ */
/*  Loading overlay                                                    */
/* ------------------------------------------------------------------ */

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  backdrop-filter: blur(2px);
}

.loading-overlay[hidden] {
  display: none;
}

.loading-overlay__card {
  background: var(--color-bg-surface, #1c1f26);
  border: 1px solid var(--color-border, rgba(255,255,255,0.1));
  border-radius: var(--radius-lg, 12px);
  padding: 2rem 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.loading-overlay__spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(255,255,255,0.15);
  border-top-color: #3FB950;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.loading-overlay__message {
  font-size: var(--font-size-small, 0.875rem);
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

/* --- DC Access Error Toast --- */
.dc-access-error {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  background: #c0392b;
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-size: 0.875rem;
  max-width: 480px;
  text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  animation: fadeInDown 0.2s ease;
}

.dc-access-error[hidden] {
  display: none;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

}