* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.8;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2rem;
    color: #666;
}

.back-link {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background: #4299e1;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.back-link:hover {
    background: #3182ce;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(66, 153, 225, 0.3);
}

/* 目次 */
.toc {
    background: white;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 40px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.toc h2 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
}

.toc ul {
    list-style: none;
}

.toc li {
    margin: 8px 0;
}

.toc a {
    color: #4299e1;
    text-decoration: none;
    font-size: 1.1rem;
    display: block;
    padding: 5px 10px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.toc a:hover {
    background: #e6f2ff;
    color: #3182ce;
    padding-left: 15px;
}

/* メインコンテンツ */
main {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.guide-section {
    margin-bottom: 60px;
    scroll-margin-top: 20px;
}

.guide-section:last-child {
    margin-bottom: 0;
}

.guide-section h2 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #4299e1;
}

/* 概要図 */
.concept-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    margin: 40px 0;
    flex-wrap: wrap;
}

.concept-item {
    text-align: center;
    padding: 20px;
    background: #f7fafc;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
    min-width: 150px;
}

.concept-icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.concept-item h3 {
    font-size: 1.2rem;
    color: #2d3748;
    margin-bottom: 5px;
}

.concept-item p {
    font-size: 0.9rem;
    color: #718096;
}

.concept-plus,
.concept-equals {
    font-size: 2rem;
    color: #a0aec0;
    font-weight: bold;
}

/* ステップ */
.step {
    margin: 30px 0;
    padding: 25px;
    background: #f7fafc;
    border-radius: 8px;
    border-left: 4px solid #4299e1;
}

.step h3 {
    font-size: 1.3rem;
    color: #2d3748;
    margin-bottom: 15px;
}

.step ul {
    margin-left: 20px;
    margin-top: 10px;
}

.step li {
    margin: 8px 0;
}

.step ul ul {
    margin-top: 5px;
}

/* スクリーンショットプレースホルダー */
.screenshot-placeholder {
    margin: 20px 0;
    padding: 60px 20px;
    background: #e2e8f0;
    border-radius: 8px;
    text-align: center;
    color: #718096;
    font-style: italic;
}

/* メソッドグリッド */
.method-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.method {
    padding: 20px;
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
}

.method h4 {
    color: #2d3748;
    margin-bottom: 10px;
}

/* ヒント・注意 */
.tip,
.note {
    margin: 20px 0;
    padding: 15px 20px;
    border-radius: 8px;
}

.tip {
    background: #e6f7ff;
    border-left: 4px solid #4299e1;
}

.note {
    background: #fff7e6;
    border-left: 4px solid #ed8936;
}

/* Tipカード */
.tip-card {
    margin: 20px 0;
    padding: 20px;
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.tip-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.tip-card h3 {
    font-size: 1.2rem;
    color: #2d3748;
    margin-bottom: 10px;
}

.tip-card ul {
    margin-left: 20px;
    margin-top: 10px;
}

/* フッター */
footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

footer p {
    color: #718096;
    margin-bottom: 15px;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .guide-container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 20px;
    }
    
    .concept-diagram {
        flex-direction: column;
    }
    
    .concept-plus,
    .concept-equals {
        transform: rotate(90deg);
    }
    
    .method-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        padding: 15px;
    }
}

/* スムーススクロール */
html {
    scroll-behavior: smooth;
}

/* 強調表示 */
strong {
    color: #2d3748;
    font-weight: 600;
}