:root {
  --control-height: 46px;
  --control-height-sm: 38px;
  --control-height-lg: 52px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--control-height);
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  box-shadow: var(--shadow-small);
}

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

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

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

.btn-secondary:hover,
.btn-outline:hover {
  border-color: #cbd5e1;
  background: var(--color-background);
}

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

.btn-copy {
  min-width: 76px;
  background: var(--color-primary);
  color: var(--color-primary-text);
}

.btn-sm {
  min-height: var(--control-height-sm);
  padding-inline: 12px;
  font-size: .875rem;
}

.btn-lg {
  min-height: var(--control-height-lg);
  padding-inline: 22px;
}

/* Forms */
.form-group {
  display: grid;
  gap: 7px;
}

.form-label {
  font-size: .82rem;
  font-weight: 700;
  color: var(--color-muted);
}

.form-control {
  width: 100%;
  min-height: var(--control-height);
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-background);
  color: var(--color-text);
}

.form-control:focus {
  border-color: var(--color-primary);
}

.form-control[readonly] {
  background: var(--color-surface-alt);
}

.form-control-error {
  border-color: var(--color-error);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-small);
}

.card-interactive {
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.card-interactive:hover {
  transform: translateY(-3px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-medium);
}

/* Tool patterns */
.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.tool-output {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.tool-output-grid {
  display: grid;
  gap: 16px;
}

.tool-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.tool-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.tool-message {
  min-height: 24px;
  margin: 8px 0 0;
  color: var(--color-error);
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 999px;
  background: #eff6ff;
  color: var(--color-primary);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .05em;
}

@media (max-width: 767px) {
  .tool-grid-2,
  .tool-grid-3 {
    grid-template-columns: 1fr;
  }

  .tool-output {
    grid-template-columns: 1fr;
  }

  .tool-actions .btn {
    flex: 1 1 auto;
  }
}