/** empty-state.php */
.aidunite-empty-state {
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 280px;
            padding: 3rem 2rem;
            border-radius: 12px;
            border: 1px solid;
            margin: 2rem 0;
            text-align: center;
            transition: all 0.3s ease;
            animation: fadeInUp 0.4s ease-out;
            position: relative;
            overflow: hidden;
        }

        /* 背景の装飾的な要素（控えめ） */
        .aidunite-empty-state::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: transparent;
            pointer-events: none;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(15px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .aidunite-empty-state:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
        }

        .aidunite-empty-state__content {
            max-width: 480px;
            width: 100%;
            position: relative;
            z-index: 1;
        }

        .aidunite-empty-state__icon {
            font-size: 2.5rem;
            line-height: 1;
            margin-bottom: 1.25rem;
            opacity: 0.7;
        }

        .aidunite-empty-state__title {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0 0 0.75rem 0;
            line-height: 1.4;
            letter-spacing: -0.02em;
        }

        .aidunite-empty-state__message {
            font-size: 1rem;
            color: #6c757d;
            margin: 0 0 0.5rem 0;
            line-height: 1.7;
        }

        .aidunite-empty-state__description {
            font-size: 0.95rem;
            color: #868e96;
            margin: 0 0 1.75rem 0;
            line-height: 1.7;
        }

        .aidunite-empty-state__action {
            margin-top: 1.75rem;
        }

        .aidunite-empty-state__button {
            display: inline-block;
            padding: 0.75rem 2rem;
            border-radius: 8px;
            color: #fff;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all 0.3s ease;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
            border: 1px solid transparent;
        }

        .aidunite-empty-state__button:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
            color: #fff;
            text-decoration: none;
        }

        .aidunite-empty-state__button:active {
            transform: translateY(0);
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
        }

        .aidunite-empty-state__help {
            margin-top: 1.75rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(0, 0, 0, 0.08);
            font-size: 0.875rem;
        }

        .aidunite-empty-state__help-link {
            color: #6c757d;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .aidunite-empty-state__help-link:hover {
            color: var(--info-color);
            text-decoration: underline;
        }

        .aidunite-empty-state__help-separator {
            margin: 0 0.75rem;
            color: #adb5bd;
        }

        /* レスポンシブ対応 */
        @media (max-width: 768px) {
            .aidunite-empty-state {
                min-height: 240px;
                padding: 2rem 1.5rem;
            }

            .aidunite-empty-state__icon {
                font-size: 2rem;
                margin-bottom: 1rem;
            }

            .aidunite-empty-state__title {
                font-size: 1.25rem;
            }

            .aidunite-empty-state__message {
                font-size: 0.95rem;
            }

            .aidunite-empty-state__description {
                font-size: 0.875rem;
            }

            .aidunite-empty-state__button {
                padding: 0.65rem 1.75rem;
                font-size: 0.9rem;
            }
        }

        /* タイプ別のスタイル調整 */
        .aidunite-empty-state--info {
            border-style: solid;
        }

        .aidunite-empty-state--warning {
            border-style: solid;
        }

        .aidunite-empty-state--success {
            border-style: solid;
        }