* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        }

        body {
            background-color: #d3d3d3;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px;
        }

        .container {
            background-color: #ffffff;
            width: 100%;
            max-width: 500px;
            padding: 40px 20px;
            border-radius: 12px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .form-container {
            width: 100%;
            max-width: 400px;
            margin: 0 auto;
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
        }

        .service-logo {
            width: 70px;
            margin-bottom: 10px;
        }

        .store-logo {
            text-align: center;
            margin: 30px 0;
        }

        .store-logo img {
            width: 280px;
        }

        .description {
            text-align: center;
            margin-bottom: 30px;
            line-height: 1.6;
            color: #333;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #333;
        }

        .required {
            color: #ff4444;
            margin-left: 4px;
        }

        .form-control {
           width: 100%;
           padding: 12px;
           border: 2px solid #aaa; /* 枠線を追加 */
           border-radius: 8px;
           background-color: white;
           margin-bottom: 15px;
           transition: border-color 0.3s ease;
        }

        .form-control.error {
            border: 2px solid #ff4444;
        }

        textarea.form-control {
            height: 120px;
            resize: none;
        }

        .payment-button {
            width: 100%;
            padding: 20px;
            background: linear-gradient(to bottom, #ffffff, #f0f0f0);
            border: 2px solid #ddd;
            border-radius: 12px;
            font-size: 20px;
            font-weight: bold;
            color: #333;
            cursor: pointer;
            transition: all 0.2s ease;
            margin-top: 30px;
            box-shadow: 
                0 4px 6px rgba(0, 0, 0, 0.1),
                inset 0 1px 0 rgba(255, 255, 255, 0.7);
            letter-spacing: 2px;
            position: relative;
            text-shadow: 0 1px 0 #fff;
        }

        .payment-button:hover {
            background: linear-gradient(to bottom, #f8f8f8, #e8e8e8);
            border-color: #ccc;
            transform: translateY(-2px);
            box-shadow: 
                0 6px 12px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.7);
        }

        .payment-button:active {
            transform: translateY(1px);
            box-shadow: 
                0 2px 4px rgba(0, 0, 0, 0.1),
                inset 0 1px 0 rgba(255, 255, 255, 0.7);
            background: linear-gradient(to top, #ffffff, #f0f0f0);
        }