/* ========================================
   Components — Reusable UI Elements
   ======================================== */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 8px 18px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  font-family: var(--font-family);
  line-height: 1.5;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

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

.btn-outline:hover:not(:disabled) {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
  border-color: var(--color-text-muted);
}

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

.btn-danger:hover:not(:disabled) {
  background: #b91c1c;
}

.btn-sm {
  padding: 4px 12px;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: 12px 28px;
  font-size: var(--font-size-md);
}

.btn-block {
  width: 100%;
}

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

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

/* --- Card --- */
.card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
}

.card-header h2,
.card-header h3 {
  margin: 0;
}

/* --- Form --- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.form-input {
  display: block;
  width: 100%;
  padding: 9px 13px;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

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

.form-input:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input:disabled {
  background: var(--color-bg-disabled);
  cursor: not-allowed;
}

/* --- Checkbox --- */
.checkbox-group {
  display: flex;
  align-items: center;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* --- Toast --- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  border-radius: var(--radius-full);
  background: var(--color-text-primary);
  color: var(--color-text-inverse);
  font-size: var(--font-size-sm);
  z-index: var(--z-toast);
  box-shadow: var(--shadow-lg);
  animation: toast-in var(--transition-fast) ease-out;
  white-space: nowrap;
  pointer-events: none;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translate(-50%, 8px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* --- Spinner --- */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

.empty-state p {
  font-size: var(--font-size-sm);
  margin: 0;
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--color-bg-disabled);
  color: var(--color-text-secondary);
}

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

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

/* --- Link Row (for copy link) --- */
.link-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-page);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  word-break: break-all;
}

.link-row .link-icon {
  flex-shrink: 0;
  color: var(--color-success);
  font-size: var(--font-size-md);
}

.link-row .link-text {
  flex: 1;
  color: var(--color-primary);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Table --- */
.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

th {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  font-weight: 600;
  color: var(--color-text-secondary);
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
}

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