.single-post-wrapper{max-width:900px;margin:50px auto;padding:0 20px;font-family:"Noto Sans JP",sans-serif}.post-card{background:#fff;border-radius:12px;box-shadow:0 4px 12px rgba(0,0,0,.08);padding:30px;margin-bottom:50px}.post-card-header{border-bottom:1px solid #eee;margin-bottom:20px;padding-bottom:15px}.post-card-title{font-size:2rem;margin-bottom:10px;color:#333}.post-card-meta{font-size:.9rem;color:#888}.post-card-meta .post-card-category{margin-left:10px;padding:2px 8px;background:#f0f0f0;border-radius:8px;font-size:.8rem}.post-card-content{line-height:1.8;color:#444}.post-card-footer{margin-top:30px;border-top:1px solid #eee;padding-top:15px;font-size:.85rem;color:#666}.post-card-navigation{display:flex;justify-content:space-between;margin-bottom:50px}.post-card-navigation a{color:#007acc;text-decoration:none;font-weight:bold}.post-card-navigation a:hover{text-decoration:underline}