/* ========== DX Helper カラーパレット上書き ========== */
        .logo {
            background: linear-gradient(135deg, #1e3a5f 0%, #059669 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        section.hero {
            background: linear-gradient(135deg, #0f2438 0%, #1e3a5f 50%, #065f46 100%);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        h1 {
            font-size: clamp(28px, 5vw, 42px);
            font-weight: 900;
            margin-bottom: 16px;
            color: white;
        }

        .subtitle {
            font-size: clamp(15px, 3vw, 18px);
            opacity: 0.95;
            color: white;
        }

        .content {
            background: white;
            padding: 60px 20px;
        }

        h2 {
            font-size: clamp(20px, 4vw, 26px);
            font-weight: 700;
            margin-top: 40px;
            margin-bottom: 16px;
            color: #1e3a5f;
        }

        h2:first-child {
            margin-top: 0;
        }

        h3 {
            font-size: clamp(16px, 3vw, 20px);
            font-weight: 700;
            margin-top: 32px;
            margin-bottom: 12px;
            color: #1e293b;
        }

        p {
            margin-bottom: 16px;
            line-height: 1.9;
            color: #495057;
        }

        ul,
        ol {
            margin-left: 24px;
            margin-bottom: 24px;
        }

        li {
            margin-bottom: 12px;
            line-height: 1.8;
            color: #495057;
        }

        .update-date {
            text-align: right;
            color: #6c757d;
            font-size: 14px;
            margin-bottom: 32px;
        }

        .back-link {
            display: inline-block;
            background: linear-gradient(135deg, #1e3a5f 0%, #059669 100%);
            color: white;
            padding: 12px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            margin-top: 40px;
            transition: all 0.3s ease;
        }

        .back-link:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(30, 58, 95, 0.4);
        }

        /* ========== FAQ ========== */
        .faq-item {
            background: #fff;
            border: 1px solid #e2e8f0;
            border-radius: 12px;
            padding: 24px 28px;
            margin-bottom: 16px;
            transition: box-shadow 0.2s;
        }

        .faq-item:hover {
            box-shadow: 0 4px 16px rgba(30, 58, 95, 0.08);
        }

        .faq-question {
            font-size: 16px;
            font-weight: 700;
            color: #1e293b;
            margin-top: 0;
            margin-bottom: 12px;
            padding-left: 0;
            border-left: 4px solid #1e3a5f;
            padding-left: 12px;
        }

        .faq-answer {
            font-size: 15px;
            color: #475569;
            line-height: 1.8;
            margin-bottom: 0;
        }

        /* ========== テーブル ========== */
        table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 24px;
            font-size: 15px;
        }

        th {
            background: linear-gradient(135deg, #1e3a5f 0%, #065f46 100%);
            color: white;
            font-weight: 700;
            padding: 14px 18px;
            text-align: left;
        }

        td {
            padding: 14px 18px;
            border-bottom: 1px solid #e2e8f0;
            color: #495057;
            vertical-align: top;
        }

        tr:last-child td {
            border-bottom: none;
        }

        tr:nth-child(even) td {
            background: #f8fafc;
        }

        /* ========== 情報ボックス ========== */
        .info-box {
            background: linear-gradient(135deg, rgba(30, 58, 95, 0.05) 0%, rgba(5, 150, 105, 0.05) 100%);
            border-left: 4px solid #059669;
            border-radius: 0 12px 12px 0;
            padding: 24px 28px;
            margin: 32px 0;
        }

        .info-box h3 {
            color: #059669;
            margin-top: 0;
            margin-bottom: 10px;
            font-size: 16px;
        }

        .info-box p {
            margin-bottom: 0;
            color: #475569;
        }

        /* ========== 警告ボックス ========== */
        .warning-box {
            background: linear-gradient(135deg, rgba(30, 58, 95, 0.06) 0%, rgba(5, 150, 105, 0.06) 100%);
            border-left: 4px solid #1e3a5f;
            border-radius: 0 12px 12px 0;
            padding: 24px 28px;
            margin: 32px 0;
        }

        .warning-box h3 {
            color: #1e3a5f;
            margin-top: 0;
            margin-bottom: 10px;
            font-size: 16px;
        }

        .warning-box p {
            margin-bottom: 0;
            color: #475569;
        }