html{font-size:16px}body{margin:0;font-size:1.1rem;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;line-height:1.7;color:#333;background-color:#f9f9f9}body.is-nav-active{overflow:hidden}img{max-width:100%;height:auto}ul,ol{padding-left:20px}a{color:#007bff;text-decoration:none}a:hover{text-decoration:underline}.container{display:flex;flex-direction:column;max-width:1200px;margin:0 auto;padding:0}.site-header{width:100%;padding:15px 0;background-color:#fff;border-bottom:1px solid #eee;position:relative;z-index:50}.header-inner{display:flex;justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;padding:0 15px}.site-logo a{font-size:1.5rem;font-weight:bold;color:#333;text-decoration:none}.global-nav{display:none}.global-nav ul{display:flex;margin:0;padding:0;list-style:none}.global-nav li{margin-left:20px}.hamburger-btn{display:flex;flex-direction:column;justify-content:space-around;width:40px;height:30px;padding:0;background:transparent;border:none;cursor:pointer;z-index:150}.hamburger-line{width:100%;height:3px;background-color:#333;transition:all .3s}.hamburger-btn.is-active{position:fixed;top:25px;right:15px}.hamburger-btn.is-active .hamburger-line:nth-child(1) {transform:translateY(13.5px) rotate(45deg)}.hamburger-btn.is-active .hamburger-line:nth-child(2) {opacity:0}.hamburger-btn.is-active .hamburger-line:nth-child(3) {transform:translateY(-13.5px) rotate(-45deg)}.mobile-nav{display:none;position:fixed;top:0;left:0;width:100%;height:100vh;background-color:rgba(255,255,255,.98);z-index:100;align-items:center;justify-content:center}.mobile-nav ul{display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0;padding:0;list-style:none}.mobile-nav li{margin:20px 0}.mobile-nav a{font-size:1.3rem;font-weight:bold;color:#333;padding:10px}.close-btn{position:fixed;top:20px;right:20px;z-index:110;background:#555;color:#fff;border:none;border-radius:50%;width:40px;height:40px;font-size:26px;line-height:40px;text-align:center;cursor:pointer;padding:0;transition:background-color .3s}.close-btn:hover{background-color:#888}.main-content{flex:1;order:1;padding:1rem;margin:1rem 0;background-color:#fff}.sidebar{width:100%;padding:20px 15px;background-color:#f4f4f4;order:2;box-sizing:border-box;margin:1rem 0;background-color:#fff}.breadcrumb-nav ol{display:flex;flex-wrap:wrap;list-style:none;padding:0;margin:0 0 20px 0;font-size:.9rem}.breadcrumb-nav li:not(:last-child)::after {content:">";margin:0 .5em;color:#888}.breadcrumb-nav span{color:#777}.post-title{font-size:2rem;margin-top:0;margin-bottom:10px;line-height:1.3}.post-meta{font-size:.9rem;color:#888;margin-bottom:25px}.post-meta time{margin-right:15px}.table-of-contents{font-size:.95rem;background:#fff;border:1px solid #e0e0e0;padding:15px 20px;margin-bottom:30px;border-radius:5px}.table-of-contents h2{font-size:1.2rem;margin-top:0;border-bottom:1px solid #ccc;padding-bottom:5px}.table-of-contents ul{padding-left:20px;margin-bottom:0}.table-of-contents li{margin:5px 0}.toc-item.level-h2{list-style-type:disc}.toc-item.level-h3{list-style-type:circle;margin-left:1em;font-size:.95em}.toc-item.level-h4{list-style-type:square;margin-left:1.5em;font-size:.9em}.post-body h2{font-size:1.5rem;margin:3rem 0 2rem 0;padding:1rem;background-color:#f5f6f7;text-align:center}.post-body h3{font-size:1.2rem;margin:2rem 0 0 0;border-bottom:2px solid;text-align:center}.post-body h4{font-size:1.1rem;margin:2rem 0 0 0;padding:.5rem 1rem;border-left:5px solid #a9a9a9;text-align:left}.post-body table{width:100%;border-collapse:collapse;margin:20px 0;font-size:.9rem;overflow-x:auto;display:block}.post-body th,.post-body td{border:1px solid #ccc;padding:10px;text-align:left;min-width:100px}.post-body th{background-color:#f0f0f0;font-weight:bold}.related-posts{margin-top:40px}.sidebar-widget{margin-bottom:30px}.sidebar-widget h3{font-size:1.1rem;border-bottom:2px solid #ccc;padding-bottom:5px}.sidebar-widget ul{list-style:none;padding:0;margin:0}.sidebar-widget li{border-bottom:1px dashed #ddd}.sidebar-widget a{display:block;padding:8px 5px;color:#333}.sidebar-widget a:hover{background-color:#e9e9e9;text-decoration:none}.site-footer{text-align:center;padding:.5rem 0;background-color:#333;color:#fff;margin-top:1.5rem;font-size:1rem}.footer-nav ul{display:flex;justify-content:center;flex-wrap:wrap;list-style:none;padding:0;margin:0}.footer-nav li{margin:5px 15px}.footer-nav a{color:#fff}.copyright{margin:0;font-size:.9rem}@media (min-width:768px){.container{flex-direction:row;padding:0}.hamburger-btn{display:none}.mobile-nav{display:none!important}.close-btn{display:none!important}.global-nav{display:block}.main-content{width:75%;order:1;padding:30px}.sidebar{width:25%;order:2;padding:30px;margin-left:1rem}.post-body table{display:table;width:100%}}.back-btn{position:fixed;right:15px;bottom:15px;width:42px;height:42px;border:none;border-radius:50%;background:#333;color:#fff;font-size:.7rem;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .3s ease , transform .2s ease;z-index:1000;text-align:center}.back-btn.show{opacity:.85;pointer-events:auto}.back-btn:hover{opacity:1;transform:scale(1.05)}#toTocBtn{bottom:70px}