.flat-recommend-card {
    margin: 20px auto;
    max-width: 600px;
    background: #ffffff;
    border: 1px solid #e2e8f0; /* 薄いグレーの線 */
    border-radius: 8px;
    overflow: hidden;
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    transition: transform 0.2s ease;
}

.flat-recommend-card:hover {
    transform: translateY(-2px);
    border-color: #cbd5e1; /* ホバー時に少しだけ線を濃く */
}

.flat-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    text-decoration: none !important;
}

.flat-content {
    flex: 1;
    padding-right: 15px;
}

/* 小さなラベル */
.flat-label {
    display: inline-block;
    font-size: 10px;
    font-weight: bold;
    color: #64748b;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

/* メイン文章 */
.flat-main-copy {
    margin: 0 0 6px 0;
    color: #1e293b;
    font-size: 18px;
    font-weight: bold;
    line-height: 1.4;
}

/* サブ文章 */
.flat-sub-copy {
    margin: 0;
    color: #64748b;
    font-size: 14px;
    line-height: 1.5;
}

/* 右側の矢印・アクション部分 */
.flat-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 100px;
    border-left: 1px solid #f1f5f9;
    padding-left: 15px;
}

.flat-arrow span {
    font-size: 13px;
    color: #3b82f6; /* 落ち着いたブルー */
    font-weight: bold;
}

/* レスポンシブ：スマホでは縦並びに近く調整 */
@media (max-width: 480px) {
    .flat-inner {
        flex-direction: column;
        text-align: center;
    }
    .flat-content {
        padding-right: 0;
        margin-bottom: 15px;
    }
    .flat-arrow {
        border-left: none;
        border-top: 1px solid #f1f5f9;
        padding-left: 0;
        padding-top: 15px;
        width: 100%;
    }
    .flat-main-copy {
        font-size: 17px;
    }
}