/* ============================
   Challenges Section
   「こういうことで、困っていませんか？」
   2カラムレイアウト：左イラスト、右チェックリスト
   ============================ */

.section-challenges {
    background: linear-gradient(135deg, #ffffff 0%, #f5f8fc 100%);
    padding: 100px 0;
    overflow: hidden;
}

/* セクションヘッダー */
.challenges-header {
    text-align: center;
    margin-bottom: 60px;
}

.challenges-headline {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

.challenges-subheadline {
    font-size: 1.0625rem;
    color: #5B6B82;
    font-weight: 400;
    letter-spacing: 0.02em;
    line-height: 1.7;
}

/* 2カラムレイアウト */
.challenges-two-column {
    display: grid;
    grid-template-columns: 55% 45%;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
    align-items: center;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.challenges-two-column.fade-in {
    opacity: 1;
    transform: translateY(0);
}

/* 左カラム: イラスト */
.challenges-visual-column {
    display: flex;
    justify-content: center;
    align-items: center;
}

.challenges-illustration {
    width: 100%;
    max-width: 780px;
    height: auto;
    display: block;
    transition: transform 0.4s ease;
}

.challenges-illustration:hover {
    transform: scale(1.02);
}

/* 右カラム: チェックリスト */
.challenges-checklist-column {
    background: #ffffff;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(31, 79, 216, 0.08);
}

/* チェックリスト */
.challenges-checklist {
    list-style: none;
    padding: 0;
    margin: 0 0 32px;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.checklist-item {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    padding: 0;
    opacity: 0;
    transform: translateX(-15px);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.checklist-item.show {
    opacity: 1;
    transform: translateX(0);
}

/* チェックアイコン */
.check-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    min-width: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3B82F6 0%, #60A5FA 100%);
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    line-height: 1;
    box-shadow: 0 3px 10px rgba(59, 130, 246, 0.25);
}

/* チェックテキスト */
.check-text {
    font-size: 1.125rem;
    font-weight: 500;
    color: #2D3748;
    line-height: 1.75;
    letter-spacing: 0.01em;
}

/* 結論コピー（2カラムの下に独立配置） */
.challenges-conclusion {
    max-width: 800px;
    margin: 48px auto 0;
    padding: 32px 40px;
    background: linear-gradient(135deg, #EFF6FF 0%, #F0F9FF 100%);
    border-left: 4px solid #1F4FD8;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(31, 79, 216, 0.08);
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.3s;
}

.challenges-conclusion.fade-in {
    opacity: 1;
    transform: translateY(0);
}

.challenges-conclusion p {
    font-size: 1.25rem;
    font-weight: 500;
    color: #1F4FD8;
    margin: 0;
    line-height: 1.8;
    letter-spacing: 0.02em;
}

.challenges-conclusion strong {
    font-weight: 700;
    font-size: 1.375rem;
}

/* レスポンシブ対応 */
@media (max-width: 1024px) {
    .challenges-two-column {
        grid-template-columns: 45% 55%;
        gap: 36px;
    }
    
    .challenges-illustration {
        max-width: 520px;
    }
    
    .challenges-checklist-column {
        padding: 36px 32px;
    }
}

@media (max-width: 768px) {
    .section-challenges {
        padding: 60px 0;
    }
    
    .challenges-header {
        margin-bottom: 48px;
    }
    
    .challenges-headline {
        font-size: 1.75rem;
        margin-bottom: 12px;
    }
    
    .challenges-subheadline {
        font-size: 0.9375rem;
    }
    
    .challenges-two-column {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 0 20px;
    }
    
    .challenges-illustration {
        max-width: 100%;
        min-width: 320px;
    }
    
    .challenges-checklist-column {
        padding: 32px 28px;
    }
    
    .challenges-checklist {
        gap: 24px;
    }
    
    .checklist-item {
        gap: 16px;
    }
    
    .check-icon {
        width: 28px;
        height: 28px;
        min-width: 28px;
        font-size: 15px;
    }
    
    .check-text {
        font-size: 1.0625rem;
    }
    
    .challenges-conclusion {
        margin-top: 40px;
        padding: 24px 28px;
    }
    
    .challenges-conclusion p {
        font-size: 1.125rem;
    }
    
    .challenges-conclusion strong {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .section-challenges {
        padding: 50px 0;
    }
    
    .challenges-headline {
        font-size: 1.5rem;
    }
    
    .challenges-subheadline {
        font-size: 0.875rem;
    }
    
    .challenges-two-column {
        gap: 32px;
        padding: 0 16px;
    }
    
    .challenges-illustration {
        min-width: 280px;
    }
    
    .challenges-checklist-column {
        padding: 28px 24px;
    }
    
    .challenges-checklist {
        gap: 20px;
    }
    
    .checklist-item {
        gap: 14px;
    }
    
    .check-icon {
        width: 26px;
        height: 26px;
        min-width: 26px;
        font-size: 14px;
    }
    
    .check-text {
        font-size: 1rem;
    }
    
    .challenges-conclusion {
        margin-top: 32px;
        padding: 20px 24px;
    }
    
    .challenges-conclusion p {
        font-size: 1rem;
    }
    
    .challenges-conclusion strong {
        font-size: 1.125rem;
    }
}