/* カスタムスタイル */
        body {
            color: #404040;
            line-height: 1.8;
            background-color: #ffffff;
            -webkit-font-smoothing: antialiased;
        }
        h1, h2, h3, h4, h5, h6 {
            color: #171717;
            font-weight: 700;
            line-height: 1.4;
            letter-spacing: 0.05em;
        }
        html { scroll-behavior: smooth; }
        
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        @media (min-width: 1024px) {
            .section-padding {
                padding-top: 8rem;
                padding-bottom: 8rem;
            }
        }

        /* 追従ヘッダー */
        #sticky-header {
            transform: translateY(-100%);
            transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        }
        #sticky-header.is-visible {
            transform: translateY(0);
        }

        /* アニメーション */
        .fade-in-up {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .fade-in-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* フォームの共通スタイル調整 */
        .form-input {
            width: 100%;
            border: 1px solid #d4d4d4;
            border-radius: 0; /* シャープな印象 */
            padding: 0.75rem 1rem;
            font-size: 0.875rem;
            color: #171717;
            transition: border-color 0.2s, box-shadow 0.2s;
            background-color: #fcfcfc;
        }
        .form-input:focus {
            outline: none;
            border-color: #1a365d;
            box-shadow: 0 0 0 1px #1a365d;
            background-color: #ffffff;
        }
        .form-input.is-error {
            border-color: #dc2626;
            background-color: #fef2f2;
        }
        .form-input.is-error:focus {
            box-shadow: 0 0 0 1px #dc2626;
        }
        
        /* Choices.js のカスタムスタイル（トンマナ合わせ） */
        .choices {
            margin-bottom: 0;
        }
        .choices__inner {
            border-radius: 0;
            background-color: #fcfcfc;
            border: 1px solid #d4d4d4;
            min-height: 46px;
            padding: 4.5px 8px 0.75px;
            font-size: 0.875rem;
            color: #171717;
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        .is-focused .choices__inner, 
        .is-open .choices__inner {
            border-color: #1a365d;
            box-shadow: 0 0 0 1px #1a365d;
            background-color: #ffffff;
        }
        .choices__list--multiple .choices__item {
            background-color: #1a365d;
            border: 1px solid #0f2942;
            border-radius: 2px;
            font-size: 0.75rem;
            font-weight: 700;
        }
        .choices[data-type*="select-multiple"] .choices__button {
            border-left: 1px solid rgba(255,255,255,0.3);
        }
        .is-error .choices__inner {
            border-color: #dc2626;
            background-color: #fef2f2;
        }
        .is-error.is-focused .choices__inner {
            box-shadow: 0 0 0 1px #dc2626;
        }

        /* エラーメッセージ */
        .error-msg {
            display: none;
            color: #dc2626;
            font-size: 0.75rem;
            font-weight: 700;
            margin-top: 0.5rem;
        }
        .is-error + .error-msg,
        .is-error-container .error-msg {
            display: block;
            animation: fadeIn 0.3s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-5px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* 画面切り替え用の非表示クラス */
        .hidden-screen {
            display: none !important;
        }