body {
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    font-family: 'Noto Sans JP', sans-serif;
}

body .content-container {
    position: relative;
    margin-top: 30px;
    padding: 20px;
    width: calc(100% - 400px);
    box-sizing: border-box;
}

.article-container {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    padding: 30px;
    margin: 45px auto;
    max-width: 900px;
}

.article-header {
    margin-bottom: 30px;
}

.article-title {
    font-size: 1.5em;
    color: #333;
    margin-bottom: 15px;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.article-category {
    background: none;
    padding: 0;
    border-radius: 0;
    font-size: 0.8em;
    color: #495057;
    display: inline;
}

.article-category::before {
    content: "#";
    margin-right: 4px;
}

.article-date {
    color: #000;
    font-size: 0.9em;
    display: flex;
    align-items: center;
    gap: 5px;
}

.article-image {
    width: 60%;
    display: block;
    margin-left: auto;
    margin-right: auto;
    aspect-ratio: 3 / 2;
    height: auto;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 30px;
}

.article-content {
    line-height: 1.8;
    color: #333;
    overflow-wrap: break-word;
    white-space: normal;  
}

.article-content pre {
    background-color: #f6f8fa;
    border-radius: 6px;
    padding: 16px;
    overflow: auto;
    font-family: monospace;
    white-space: pre;  
    tab-size: 4;
    -moz-tab-size: 4;
    -o-tab-size: 4;
    margin: 1em 0;
}

.article-content code {
    background-color: rgba(175, 184, 193, 0.2);
    border-radius: 6px;
    padding: 0.2em 0.4em;
    font-family: monospace;
    font-size: 85%;
}

.article-content ul,
.article-content ol {
    padding-left: 2em;
    margin: 1em 0;
}

.article-content li {
    margin: 0.5em 0;
}

.article-content p {
    margin: 1em 0;
    white-space: pre-line;  
}

.article-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5em 0;
    display: block;
    overflow-x: auto;  
}

.article-content th,
.article-content td {
    border: 1px solid #d0d7de;
    padding: 8px 16px;
}

.article-content th {
    background-color: #f6f8fa;
    font-weight: 600;
}

.article-content tr:nth-child(even) {
    background-color: #f6f8fa;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    line-height: 1.25;
    font-weight: 600;
    padding-bottom: 0.3em;
}

.article-content h2 {
    font-size: 1.3em;
    border-bottom: 1px solid #d0d7de;
}

.article-content h3 {
    font-size: 1.2em;
}

.article-content blockquote {
    padding: 0 1em;
    color: #57606a;
    border-left: 0.25em solid #d0d7de;
    margin: 1em 0;
}

.article-content hr {
    height: 0.25em;
    padding: 0;
    margin: 24px 0;
    background-color: #d0d7de;
    border: 0;
}

.back-link {
    display: inline-block;
    color: #333333;
    font-weight: bold;
    text-decoration: none;
    margin-top: 30px;
    margin-left: 30px;
    transition: transform 0.2s ease;
}

.back-link:hover {
    transform: translateX(-3px);
}

.success-message {
    color: #28a745;
    padding: 10px;
    border-radius: 4px;
    background-color: #d4edda;
    margin-bottom: 20px;
    text-align: center;
}

.error-message {
    color: #dc3545;
    padding: 10px;
    border-radius: 4px;
    background-color: #f8d7da;
    margin-bottom: 20px;
    text-align: center;
}

.article-container > * {
    max-width: 700px; 
    margin-left: auto;
    margin-right: auto;
}

@media (max-width: 600px) {
    #contact-form-section {
        margin-top: -80px !important;
    }
    
    body .content-container {
        width: 100%;
        padding: 10px;
        margin-bottom: 80px !important;  
    }
    
    .article-container {
        background: white;
        border-radius: 15px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        padding: 30px;
        margin: 30px auto;
        max-width: 900px;
    }
    
    .article-image {
         aspect-ratio: 3 / 2 !important;
         max-height: none !important;
         height: auto !important;
         object-fit: cover;
    }
    
    .floating-contact-btn {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 56px;
        background-color: #F15A22;
        color: white;
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 18px;
        text-decoration: none;
        box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.3);
        z-index: 1000;
    }
    .floating-contact-btn i {
        margin-left: 8px;
    }
}

.markdown-content {
    white-space: pre-wrap;  
    tab-size: 4;           
    word-wrap: break-word; 
}

.markdown-content h2 {
    font-size: 1.5em;
    margin: 0.5em 0;
    padding-bottom: 0.3em;
    border-bottom: 1px solid #eee;
}

.markdown-content p {
    margin: 1em 0;
}

.markdown-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5em 0;
}

.markdown-content th,
.markdown-content td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

.markdown-content th {
    background-color: #f5f5f5;
}

.markdown-content strong {
    font-weight: bold;
}

.markdown-content ul,
.markdown-content ol {
    padding-left: 2em;
    margin: 1em 0;
}

.article-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5em 0;
    font-size: 0.9em;
}

.article-content th,
.article-content td {
    border: 1px solid #ddd;
    padding: 12px 8px;
    text-align: left;
}

.article-content th {
    background-color: #f5f5f5;
    font-weight: bold;
}

.article-content tr:nth-child(even) {
    background-color: #f9f9f9;
}

.article-content tr:hover {
    background-color: #f5f5f5;
}

@media (max-width: 600px) {
    .article-content {
        overflow-x: auto;
    }
    
    .article-content table {
        min-width: 100%;
    }
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin-top: 0.8em;  
    margin-bottom: 0.4em;  
    color: #333;
}

@media (min-width: 601px) {
    .floating-contact-btn {
        display: none;
    }
}