#age-verification-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            display: flex;
            justify-content: center;
            align-items: flex-start;
            padding-top: 30vh;
            z-index: 9999;
            box-sizing: border-box;
        }

        .age-modal {
            background: #fff;
            padding: 2.5rem;
            border-radius: 15px;
            text-align: center;
            width: 100%;
            max-width: 500px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
            animation: modalFadeIn 0.3s ease-out;
        }

        @keyframes modalFadeIn {
            from {
                opacity: 0;
                transform: scale(0.9);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        .age-modal p {
            font-size: 1.2rem;
            color: #000000;
            margin-bottom: 2rem;
            line-height: 1.5;
        }

        .button-container {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }

        .age-modal button {
            flex: 1;
            min-width: 120px;
            max-width: 180px;
            padding: 1rem 2rem;
            font-size: 1.1rem;
            font-weight: 600;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: none;
        }

        #yes-btn {
            background: linear-gradient(135deg, #007bff, #0056b3);
            color: white;
        }

        #yes-btn:hover {
            background: linear-gradient(135deg, #0056b3, #004085);
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
        }

        #no-btn {
            background: linear-gradient(135deg, #6c757d, #5a6268);
            color: white;
        }

        #no-btn:hover {
            background: linear-gradient(135deg, #5a6268, #495057);
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(108, 117, 125, 0.3);
        }


        /* レスポンシブ対応 */
        @media (max-width: 768px) {
            .age-modal {
                padding: 2.2rem 1.1rem;
                margin: 1rem;
            }

            .age-modal p {
                font-size: 1.1rem;
            }

            .button-container {
                flex-direction: column;
                align-items: center;
            }

            .age-modal button {
                width: 100%;
                max-width: 300px;
                padding: 1.2rem;
                font-size: 1.1rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .hero p {
                font-size: 1rem;
            }
        }

        @media (max-width: 480px) {
            #age-verification-overlay {
            padding-top: 50vh;
            }
            .age-modal {
                padding: 3.8rem 1.8rem;
            }

            .age-modal p {
                font-size: 1.8rem;
            }

            .age-modal button {
                padding: 1.5rem;
                font-size: 1.8rem;
            }
        }

        /* 隠しクラス */
        .hidden {
            display: none !important;
        }