:root {
            --primary-color: #2c3e50;
            --accent-color: #3498db;
            --border-color: #dcdde1;
            --bg-color: #f5f7fa;
            --card-bg: #ffffff;
            --text-color: #2f3640;
            --sub-text-color: #7f8c8d;
            --success-color: #27ae60;
        }

        body {
            font-family: 'Inter', 'Noto Sans JP', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            margin: 0;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            min-height: 100vh;
        }

        .form-container {
            width: 100%;
            max-width: 800px;
            background: var(--card-bg);
            padding: 40px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
        }

        header {
            text-align: center;
            margin-bottom: 30px;
            border-bottom: 2px solid #eee;
            padding-bottom: 12px;
        }

        .brand-mark {
            display: flex;
            justify-content: center;
            margin-bottom: 6px;
        }

        .brand-mark img {
            height: 40px;
            width: auto;
        }

        .form-description {
            margin-top: 10px;
            font-size: 14px;
            color: var(--sub-text-color);
            line-height: 1.6;
        }

        h1 {
            margin: 0;
            font-size: 28px;
            color: var(--primary-color);
            font-weight: 700;
        }

        .section {
            margin-bottom: 35px;
            animation: fadeIn 0.5s ease-out forwards;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .section-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .section-title::before {
            content: '';
            width: 4px;
            height: 20px;
            background: var(--accent-color);
            border-radius: 2px;
        }

        .grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .field-group > .form-group,
        .field-group > .grid {
            margin-bottom: 12px;
        }
        .field-group > .form-group:last-child,
        .field-group > .grid:last-child {
            margin-bottom: 0;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        label {
            font-size: 14px;
            font-weight: 600;
            color: var(--sub-text-color);
        }

        .required-label {
            color: #ef4444;
            font-weight: 700;
            font-size: 0.85rem;
            margin-left: 6px;
        }

        input[type="text"],
        input[type="email"],
        input[type="tel"],
        textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.2s;
            box-sizing: border-box;
            background: #fdfdfd;
        }

        input:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
            background: #fff;
        }

        .form-group.has-error input,
        .form-group.has-error textarea {
            border-color: #ef4444;
        }

        .error-message {
            color: #ef4444;
            font-size: 12px;
            min-height: 16px;
        }

        .checkbox-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 12px;
        }

        .checkbox-card {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s;
            user-select: none;
        }

        .checkbox-card:hover {
            border-color: var(--accent-color);
            background-color: rgba(52, 152, 219, 0.02);
        }

        .checkbox-card input[type="checkbox"] {
            width: 16px;
            height: 16px;
            cursor: pointer;
        }

        .checkbox-card.active {
            border-color: var(--accent-color);
            background-color: rgba(52, 152, 219, 0.05);
        }

        input[type="text"].other-input {
            margin-top: 8px;
            padding: 8px 12px;
            font-size: 13px;
            display: none;
            width: 100%;
            border: 1px solid var(--border-color);
            border-radius: 4px;
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-5px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .checkbox-card.has-other {
            grid-column: 1 / -1;
            flex-direction: column;
            align-items: flex-start;
        }

        .checkbox-card.has-other .label-wrapper {
            display: flex;
            align-items: center;
            gap: 10px;
            width: 100%;
        }

        .section-header {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 8px;
            margin-bottom: 20px;
        }

        .select-all-wrapper {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 4px;
        }

        .section-header .section-title {
            margin-bottom: 8px;
        }

        .section-note {
            font-size: 12px;
            color: var(--text-muted);
            text-align: left;
            margin-top: 6px;
        }

        .section-note strong {
            font-weight: 600;
        }