.guide-header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 20px;
}

.guide-header h2 {
    font-size: 2.5em;
    color: #2C3E50;
    margin-bottom: 10px;
}

/* タブナビゲーション */
.guide-nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.guide-tab {
    padding: 12px 30px;
    font-size: 1.2em;
    font-weight: bold;
    border: 2px solid #ddd;
    background: #fff;
    border-radius: 30px;
    cursor: pointer;
    color: #666;
    transition: all 0.3s ease;
}

.guide-tab.active {
    border-color: #2C3E50;
    background: #2C3E50;
    color: #fff;
    box-shadow: 0 4px 10px rgba(106, 5, 113, 0.3);
}

/* コンテンツ表示エリア */
.guide-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.guide-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ステップごとのセクション */
.step-section {
    display: flex;
    align-items: center;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
}

.step-number {
    font-size: 3em;
    font-weight: 900;
    color: #e0e0e0;
    margin-right: 30px;
    font-family: 'Arial', sans-serif;
    line-height: 1;
}

.step-details {
    flex: 1;
    text-align: left;
}

.step-details h3 {
    color: #333;
    font-size: 1.5em;
    margin-top: 0;
    margin-bottom: 10px;
}

.step-image {
    width: 300px;
    height: auto;
    margin-left: 30px;
    flex-shrink: 0;
    justify-content: center;
}

.placeholder-img {
    width: 100%;
    height: 100%;
    background-color: #f0f2f5;
    border: 2px dashed #ccc;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
    font-weight: bold;
}

/* スマホ対応 */
@media (max-width: 768px) {
    .step-section {
        flex-direction: column;
        text-align: center;
        padding: 20px;
    }
    
    .step-number {
        margin-right: 0;
        margin-bottom: 10px;
    }
    
    .step-details {
        text-align: center;
        margin-bottom: 20px;
    }
    
    .step-image {
        margin-left: 0;
        width: 100%;
        max-width: 300px;
    }

    .main-nav {
        margin-left: 0;
        margin-top: 10px;
        width: 100%;
        justify-content: center;
    }
}