/* =============================================================================
   CHIAROSCURO SHARED COMPONENTS
   Reusable component classes for the Frostroad ecosystem.
   Matched to Clockwork reference implementation.
   Zero hardcoded colors/spacing/radii — all via tokens.
   ============================================================================= */

/* -- Buttons (base) --------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 10px 12px;
  min-height: 44px;
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-radius: var(--radius-xs);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  text-decoration: none;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn:active:not(:disabled) {
  filter: brightness(0.9);
}

.btn:focus-visible {
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-blue-glow);
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
  color: var(--color-text-disabled);
}

/* Primary — radial gradient blue */
.btn-primary {
  color: var(--color-text-white);
  background: radial-gradient(ellipse at bottom, var(--color-blue-light) 0%, var(--color-blue) 80%);
  border: 1px solid var(--white-15);
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.2);
  border-color: var(--white-20);
}

.btn-primary:disabled,
.btn-primary[disabled] {
  color: var(--color-text-disabled);
  background: var(--color-surface);
  border-color: var(--color-border);
  filter: none;
}

/* Secondary */
.btn-secondary {
  color: var(--color-text);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover:not(:disabled) {
  filter: brightness(1.3);
  border-color: var(--color-text-placeholder);
}

/* Ghost — subtle radial gradient */
.btn-ghost {
  color: var(--color-text-muted);
  background: radial-gradient(ellipse at bottom, var(--white-8) 0%, transparent 80%);
  border: 1px solid var(--color-border-strong);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--color-text);
  filter: brightness(1.3);
  border-color: var(--color-text-placeholder);
}

/* Danger — radial gradient rose */
.btn-danger {
  color: var(--color-text-white);
  background: radial-gradient(ellipse at bottom, var(--color-rose-light) 0%, var(--color-rose) 80%);
  border: 1px solid var(--white-15);
}

.btn-danger:hover:not(:disabled) {
  filter: brightness(1.2);
  border-color: var(--white-20);
}

.btn-danger:disabled,
.btn-danger[disabled] {
  color: var(--color-text-disabled);
  background: var(--color-surface);
  border-color: var(--color-border);
  filter: none;
}

/* Icon button */
.btn-icon {
  padding: var(--space-1);
  min-height: 32px;
  min-width: 32px;
  border-radius: var(--radius-xs);
  background: transparent;
  color: var(--color-text-placeholder);
  border: none;
}

.btn-icon svg {
  width: 14px;
  height: 14px;
}

.btn-icon:hover:not(:disabled) {
  filter: brightness(1.3);
  color: var(--color-text);
}

.btn-icon:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  color: var(--color-text-disabled);
}

.btn-icon-danger:hover:not(:disabled) {
  color: var(--color-rose);
}

/* Sizes */
.btn-sm {
  padding: var(--space-1) var(--space-3);
  min-height: 32px;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  min-height: 48px;
  font-size: var(--font-size-lg);
}

/* -- Form Controls ---------------------------------------------------------- */

.input,
.textarea,
.select {
  display: block;
  width: 100%;
  padding: 10px 14px;
  min-height: 44px;
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  outline: none;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.input:hover,
.textarea:hover,
.select:hover {
  border-color: var(--color-border-strong);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 2px var(--color-blue-ring);
}

.input:focus-visible,
.textarea:focus-visible,
.select:focus-visible {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 2px var(--color-blue-ring);
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  color: var(--color-text-disabled);
  background: var(--color-bg);
  border-color: var(--color-border);
  cursor: not-allowed;
}

.textarea {
  min-height: 96px;
  resize: vertical;
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239592A4' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
}

/* Form labels (uppercase, spaced) */
.form-label {
  display: block;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

/* -- Cards ------------------------------------------------------------------ */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--transition-fast);
}

.card:hover {
  border-color: var(--color-border-strong);
}

.card-elevated {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  padding: var(--space-5);
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}

/* Section cards — content containers */
.section-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-4);
}

/* -- Badges ----------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  font-size: 10px;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-normal);
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

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

.badge-error {
  color: var(--color-rose);
  background: var(--color-rose-dim);
}

.badge-info {
  color: var(--color-blue);
  background: var(--color-blue-dim);
}

/* -- Tags ------------------------------------------------------------------- */

.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  color: var(--color-text-muted);
  background: radial-gradient(ellipse at bottom, var(--white-8) 0%, var(--color-surface-element) 80%);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.tag-removable {
  cursor: pointer;
}

.tag-removable:hover {
  filter: brightness(1.3);
  border-color: var(--color-text-placeholder);
  color: var(--color-text);
}

.tag-removable:active:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-text-placeholder);
}

.tag-removable:focus-visible {
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-blue-glow);
}

.tag-removable:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.tag.selected {
  color: var(--color-blue);
  background: var(--color-blue-dim);
  border-color: var(--color-blue);
}

.tag.selected::before {
  content: '\2713';
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  margin-right: var(--space-1);
}

/* -- Status Dots ------------------------------------------------------------ */

.status-dot {
  display: inline-block;
  width: var(--space-2);
  height: var(--space-2);
  border-radius: 50%;
  background: var(--color-text-disabled);
}

.status-dot-active {
  background: var(--color-success);
}

.status-dot-warning {
  background: var(--color-warning);
}

.status-dot-error {
  background: var(--color-error);
}

/* -- Skeleton Loading ------------------------------------------------------- */

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.15; }
}

.skeleton-line {
  height: var(--font-size-sm);
  background: var(--color-surface-raised);
  border-radius: var(--radius-sm);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.skeleton-block {
  height: 80px;
  background: var(--color-surface-raised);
  border-radius: var(--radius-md);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.skeleton-circle {
  width: var(--space-10);
  height: var(--space-10);
  background: var(--color-surface-raised);
  border-radius: 50%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* -- Spinner ---------------------------------------------------------------- */

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

.spinner {
  display: inline-block;
  width: var(--space-5);
  height: var(--space-5);
  border: 2px solid var(--color-border-strong);
  border-top-color: var(--color-blue);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* -- View transitions ------------------------------------------------------- */

@keyframes panel-enter {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes modal-enter {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* -- Version pill ----------------------------------------------------------- */

.version-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: radial-gradient(ellipse at bottom, var(--white-5) 0%, transparent 80%);
  color: var(--color-text-placeholder);
  cursor: pointer;
}

.version-pill:hover {
  filter: brightness(1.3);
  color: var(--color-text-muted);
  border-color: var(--color-border-strong);
}

.version-pill:focus-visible {
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-blue-glow);
}

.version-pill:active {
  filter: brightness(0.9);
}

/* -- 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;
}