* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Hiragino Sans', 'Yu Gothic UI', 'Meiryo', sans-serif;
            line-height: 1.6;
            color: #333;
            background: #ffffff;
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 600px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            padding: 40px;
            animation: slideUp 0.8s ease-out;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .form-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .form-header h1 {
            font-size: 2rem;
            color: #4a5568;
            margin-bottom: 10px;
            font-weight: 700;
        }

        .form-header p {
            color: #718096;
            font-size: 1.1rem;
        }

        .form-group {
            margin-bottom: 25px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #4a5568;
            font-size: 1rem;
        }

        .required {
            color: #e53e3e;
            margin-left: 4px;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 15px 20px;
            border: none;
            border-radius: 12px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background-color: #f7fafc;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            background-color: white;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            transform: translateY(-2px);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 120px;
            font-family: inherit;
        }

        .submit-btn {
            width: 100%;
            padding: 18px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 20px;
            position: relative;
            overflow: hidden;
        }

        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
        }

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

        .submit-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s;
        }

        .submit-btn:hover::before {
            left: 100%;
        }

        /* レスポンシブデザイン */
        @media (max-width: 768px) {
            body {
                padding: 10px;
            }
            
            .container {
                padding: 25px;
                margin: 10px;
                border-radius: 15px;
            }
            
            .form-header h1 {
                font-size: 1.6rem;
            }
            
            .form-header p {
                font-size: 1rem;
            }
            
            .form-group input,
            .form-group textarea {
                padding: 12px 15px;
                font-size: 0.95rem;
            }
            
            .submit-btn {
                padding: 15px;
                font-size: 1rem;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 20px;
                margin: 5px;
            }
            
            .form-header h1 {
                font-size: 1.4rem;
            }
            
            .form-header {
                margin-bottom: 30px;
            }
            
            .form-group {
                margin-bottom: 20px;
            }
        }

        /* 送信完了メッセージ */
        .success-message {
            background-color: #f0fff4;
            border: 2px solid #9ae6b4;
            color: #276749;
            padding: 15px;
            border-radius: 8px;
            margin-top: 20px;
            text-align: center;
            display: none;
        }