/* ============================================
   Buttons
   .btn — solid filled buttons (primary, secondary, success, danger)
   .action-btn — ghost/text buttons used in navigation islands
   ============================================ */

/* Base button */
.btn {
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-family);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  box-shadow: var(--shadow-button);
}

.btn:active {
  transform: translateY(1px);
}

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

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

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-gray-30);
}

.btn-secondary:hover {
  background-color: var(--color-gray-10);
  border-color: var(--color-gray-40);
}

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

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

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

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

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

/* Button groups */
.btn-group {
  display: inline-flex;
  align-items: stretch;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-button);
}

.btn-group form {
  display: flex;
  margin: 0;
}

.btn-group .btn {
  border-radius: 0;
  box-shadow: none;
}

.btn-group .btn + .btn,
.btn-group form + form .btn {
  border-left: 1px solid rgba(255, 255, 255, 0.2);
}

/* Action buttons (ghost / text style) */
.action-btn {
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: transparent;
  color: var(--color-text-secondary);
}

.action-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-gray-10);
}

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

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

.action-btn.danger {
  color: var(--color-danger);
}

.action-btn.danger:hover {
  background: var(--color-danger-light);
}