/* ===== Extended Use Cases Section (Improved) ===== */
.extuse {
    padding: clamp(40px, 5vw, 70px) 0;
    background: #F5F8FC; /* LP標準背景色に統一 */
}

.extuse__inner {
    width: min(1100px, calc(100% - 40px));
    margin: 0 auto;
}

.extuse__title {
    text-align: center;
    margin: 0 0 32px;
    font-size: clamp(22px, 2.8vw, 34px);
    font-weight: 700;
    color: #1e3a8a; /* ネイビーブルー（LP見出しトーン） */
    letter-spacing: 0.02em;
}

/* ===== 拡張ユースケース共通ブロック（カード型） ===== */
.extension-usecase-summary {
    margin-top: 32px;
    padding: 24px;
    background: transparent; /* 背景を透明に */
    border-radius: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

/* 各カード（横並びレイアウト：左アイコン、右テキスト） */
.extension-card {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    text-align: left;
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%); /* 淡いブルーグラデーション */
    border-radius: 16px;
    padding: 28px 32px;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.08); /* 青みがかった影 */
    border: 1px solid rgba(59, 130, 246, 0.1);
    transition: all 0.3s ease;
}

.extension-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.2);
}

/* アイコンエリア（左側配置） */
.extension-icon-area {
    flex-shrink: 0;
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 24px;
}

.extension-svg-icon {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 2px 4px rgba(59, 130, 246, 0.15));
}

/* SVGアイコンの線幅を太く */
.extension-svg-icon rect,
.extension-svg-icon path,
.extension-svg-icon line {
    stroke-width: 2.5;
}

/* コンテンツエリア */
.extension-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* タイトル（サイズ拡大） */
.extension-title {
    margin: 0 0 12px;
    font-size: 18px;
    font-weight: 700;
    color: #1e40af; /* ブルー（主張しすぎない） */
    line-height: 1.5;
    letter-spacing: 0.02em;
}

/* 説明文（サイズ拡大＆行間調整） */
.extension-desc {
    margin: 0;
    font-size: 14px;
    color: #64748b; /* ブルーグレー（背景になじむ） */
    line-height: 1.75;
    letter-spacing: 0.01em;
}

/* ===== Use-case grid ===== */
.extuse-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 24px;
}

.extuse-card {
    display: block;
    text-decoration: none;
    border-radius: 18px;
    border: 2px solid #e5e7eb;
    background: #fff;
    box-shadow: 0 12px 30px rgba(17,24,39,0.08);
    overflow: hidden;
    transform: translateY(0);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    cursor: default;
}

.extuse-card:hover {
    transform: translateY(-4px);
    border-color: #c7d2fe;
    box-shadow: 0 18px 44px rgba(37,99,235,0.16);
}

.extuse-card__imgWrap {
    padding: 16px;
    background: #f8fafc;
    display: flex;
    align-items: center;
    justify-content: center;
}

.extuse-card__img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: 12px;
    display: block;
}

.extuse-card__body {
    padding: 16px 18px 18px;
}

.extuse-card__name {
    margin: 0;
    font-weight: 700;
    font-size: clamp(14px, 1.5vw, 16px);
    color: #1a1a1a; /* 黒色 */
    letter-spacing: 0.01em;
}

.extuse-card__desc {
    margin: 8px 0 0;
    color: #64748b; /* ブルーグレー */
    font-weight: 500;
    font-size: clamp(12px, 1.3vw, 14px);
    line-height: 1.5;
}

.extuse__footnote {
    margin: 24px 0 0;
    text-align: center;
    color: #64748b; /* ブルーグレー */
    font-weight: 500;
    font-size: clamp(12px, 1.3vw, 14px);
}

/* ===== Responsive ===== */
@media (max-width: 980px) {
    .extension-usecase-summary {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 20px 0;
    }
    
    .extension-card {
        padding: 24px 28px;
    }
    
    .extension-icon-area {
        width: 64px;
        height: 64px;
        margin-right: 20px;
    }
    
    .extuse-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .extuse-card__img {
        height: 150px;
    }
}

@media (max-width: 768px) {
    .extuse {
        padding: clamp(32px, 4vw, 50px) 0;
    }
    
    .extuse__title {
        font-size: clamp(20px, 4.5vw, 28px);
        margin-bottom: 24px;
    }
    
    .extension-usecase-summary {
        margin-top: 24px;
        padding: 16px 0;
        gap: 16px;
    }
    
    .extension-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 24px 20px;
    }
    
    .extension-icon-area {
        width: 72px;
        height: 72px;
        margin-right: 0;
        margin-bottom: 16px;
    }
    
    .extension-title {
        font-size: 17px;
        margin-bottom: 10px;
    }
    
    .extension-desc {
        font-size: 14px;
    }
}

@media (max-width: 520px) {
    .extuse__inner {
        width: min(1100px, calc(100% - 28px));
    }
    
    .extension-usecase-summary {
        gap: 14px;
    }
    
    .extension-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 20px 16px;
    }
    
    .extension-icon-area {
        width: 64px;
        height: 64px;
        margin-right: 0;
        margin-bottom: 14px;
    }
    
    .extension-title {
        font-size: 16px;
    }
    
    .extension-desc {
        font-size: 13px;
    }
    
    .extuse-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .extuse-card__imgWrap {
        padding: 12px;
    }
    
    .extuse-card__img {
        height: 140px;
    }
    
    .extuse-card__body {
        padding: 14px 16px 16px;
    }
    
    .extuse-card__name {
        font-size: 14px;
    }
    
    .extuse-card__desc {
        font-size: 12px;
    }
}