/* リセットとベース設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.8;
    color: #4a5568;
    background: linear-gradient(135deg, #fef5e7 0%, #fdebd0 50%, #fadbd8 100%);
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* ヘッダーセクション */
.header {
    text-align: center;
    margin-bottom: 60px;
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(244, 164, 96, 0.1);
}

.header-image {
    max-width: 100%;
    height: auto;
    margin-bottom: 30px;
    border-radius: 15px;
}

.main-title {
    font-family: 'Quicksand', 'Noto Sans JP', sans-serif;
    font-size: 2.5rem;
    color: #e74c3c;
    margin-bottom: 20px;
    font-weight: 600;
}

.subtitle {
    font-size: 1.2rem;
    color: #7f8c8d;
    line-height: 1.6;
}

/* 特典カード */
.benefits-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-bottom: 60px;
}

.benefit-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    display: flex;
    gap: 30px;
    align-items: flex-start;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.benefit-number {
    font-family: 'Quicksand', sans-serif;
    font-size: 3rem;
    font-weight: 600;
    color: #f39c12;
    opacity: 0.8;
    min-width: 80px;
}

.benefit-content {
    flex: 1;
}

.benefit-content h2 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
    font-weight: 500;
}

.benefit-description {
    color: #7f8c8d;
    margin-bottom: 20px;
    font-size: 1rem;
}

/* プロンプトテンプレート */
.prompt-template {
    background: #fef9f3;
    border-radius: 15px;
    padding: 25px;
    margin: 20px 0;
    border: 2px solid #fde2c8;
}

.prompt-template h3 {
    color: #e67e22;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.template-section {
    margin-bottom: 20px;
    padding-left: 20px;
    border-left: 3px solid #f39c12;
}

.template-section h4 {
    color: #d68910;
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.template-section p {
    color: #7f8c8d;
    font-size: 0.95rem;
}

/* 特典リンク */
.benefit-links {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: stretch;
}

/* 動画埋め込み */
.video-embed {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.benefit-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 25px;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 500;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.video-button {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
}

.video-button:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
    transform: translateY(-2px);
}

.document-button {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
}

.document-button:hover {
    background: linear-gradient(135deg, #2980b9, #21618c);
    transform: translateY(-2px);
}

.gpt-button {
    background: linear-gradient(135deg, #27ae60, #229954);
    color: white;
}

.gpt-button:hover {
    background: linear-gradient(135deg, #229954, #1e8449);
    transform: translateY(-2px);
}

.button-icon {
    font-size: 1.2rem;
}

.gpt-image {
    max-width: 200px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

/* フッター */
.footer {
    text-align: center;
    padding: 40px 20px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.footer-text {
    color: #7f8c8d;
    font-size: 1rem;
    margin-bottom: 10px;
}

.footer-message {
    color: #e74c3c;
    font-size: 1.1rem;
    font-weight: 500;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .benefit-card {
        flex-direction: column;
        padding: 30px 20px;
    }
    
    .benefit-number {
        font-size: 2.5rem;
        min-width: auto;
    }
    
    .benefit-content h2 {
        font-size: 1.3rem;
    }
    
    .benefit-links {
        flex-direction: column;
        width: 100%;
    }
    
    .video-embed {
        width: 100%;
    }
    
    .benefit-button {
        width: 100%;
        justify-content: center;
    }
    
    .gpt-image {
        max-width: 100%;
        margin-bottom: 15px;
    }
    
    .prompt-template {
        padding: 20px 15px;
    }
    
    .template-section {
        padding-left: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .header {
        padding: 30px 20px;
    }
    
    .main-title {
        font-size: 1.7rem;
    }
    
    .benefit-card {
        padding: 25px 15px;
    }
    
    .benefit-content h2 {
        font-size: 1.2rem;
    }
    
    .benefit-button {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}