/* ── Buttons ── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--text-sm);
  font-weight: 500;
  font-family: var(--font);
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

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

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

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

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

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

.btn-success {
  background: var(--success);
  color: white;
}

.btn-sm {
  padding: 2px var(--sp-3);
  font-size: var(--text-xs);
}

/* ── Badges ── */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: 100px;
}

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

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

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

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

/* ── Hint System ── */

.hint-box {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-6);
  margin: 0 var(--sp-3);
  background: var(--warning-light);
  border-left: 3px solid var(--warning);
  font-size: var(--text-sm);
  color: #92400e;
  line-height: 1.4;
  flex-shrink: 0;
}

.hint-box.visible {
  display: flex;
}

.hint-icon {
  color: var(--warning);
  font-size: 13px;
  flex-shrink: 0;
}

/* ── Output Comparison ── */

.output-compare {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--vscode-border);
  border-top: 1px solid var(--vscode-border);
}

.output-compare.visible {
  display: grid;
}

.output-col {
  background: var(--vscode-bg);
  padding: var(--sp-2) var(--sp-3);
  min-height: 48px;
}

.output-col-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--sp-1);
  font-family: var(--font);
}

.output-col-label.expected {
  color: var(--text-muted);
}

.output-col-label.actual {
  color: var(--info);
}

.output-col pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--vscode-text);
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}

/* ── Result Banner ── */

.result-banner {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-6);
  margin: 0 var(--sp-3);
  font-size: var(--text-sm);
  font-weight: 600;
  flex-shrink: 0;
}

.result-banner.visible {
  display: flex;
}

.result-banner.correct {
  background: var(--success-light);
  color: #065f46;
}

.result-banner.incorrect {
  background: var(--error-light);
  color: #991b1b;
}

.result-icon {
  font-size: var(--text-lg);
}

/* ── Loading Overlay ── */

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-6);
  transition: opacity var(--transition-slow);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-brand h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: white;
  text-align: center;
}

.loading-brand p {
  font-size: var(--text-md);
  color: var(--sidebar-text);
  text-align: center;
  margin-top: var(--sp-1);
}

.loading-steps {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  min-width: 280px;
}

.loading-step {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--text-sm);
  color: var(--sidebar-text);
  transition: color var(--transition);
}

.loading-step.active {
  color: var(--sidebar-text-active);
}

.loading-step.done {
  color: var(--success);
}

.loading-step-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  flex-shrink: 0;
  background: var(--sidebar-hover);
  color: var(--sidebar-text);
  transition: all var(--transition);
}

.loading-step.active .loading-step-icon {
  background: var(--primary);
  color: white;
}

.loading-step.done .loading-step-icon {
  background: var(--success);
  color: white;
}

.loading-spinner-small {
  width: 14px;
  height: 14px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ── Tooltip ── */

[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 3px 8px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: white;
  background: var(--sidebar-bg);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

[data-tooltip]:hover::after {
  opacity: 1;
}