✨ first version

src/components/success-modal.tsx

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+import { useEffect, useRef } from 'react'
+
+type Props = {
+  open: boolean
+  title: string
+  message: React.ReactNode
+  onClose: () => void
+}
+
+function CheckIcon() {
+  return (
+    <svg viewBox="0 0 24 24" width="22" height="22" fill="none" aria-hidden="true">
+      <circle cx="12" cy="12" r="9" stroke="currentColor" strokeWidth="1.6" />
+      <path
+        d="m8.2 12.3 2.6 2.6 5-5.4"
+        stroke="currentColor"
+        strokeWidth="1.6"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+      />
+    </svg>
+  )
+}
+
+export function SuccessModal({ open, title, message, onClose }: Props) {
+  const closeRef = useRef<HTMLButtonElement>(null)
+
+  useEffect(() => {
+    if (!open) return
+
+    closeRef.current?.focus()
+
+    function handleKeyDown(event: KeyboardEvent) {
+      if (event.key === 'Escape') onClose()
+    }
+
+    document.addEventListener('keydown', handleKeyDown)
+    return () => document.removeEventListener('keydown', handleKeyDown)
+  }, [open, onClose])
+
+  if (!open) return null
+
+  return (
+    <div className="confirm-dialog-backdrop" onClick={onClose}>
+      <div
+        className="confirm-dialog success-modal"
+        role="alertdialog"
+        aria-modal="true"
+        aria-labelledby="success-modal-title"
+        onClick={(event) => event.stopPropagation()}
+      >
+        <div className="success-modal-icon">
+          <CheckIcon />
+        </div>
+        <h2 id="success-modal-title" className="confirm-dialog-title">
+          {title}
+        </h2>
+        <p className="confirm-dialog-message">{message}</p>
+        <div className="confirm-dialog-actions">
+          <button ref={closeRef} type="button" className="btn btn-primary" onClick={onClose}>
+            OK
+          </button>
+        </div>
+      </div>
+    </div>
+  )
+}