:root{--ink:#1a211e;--text:#1a211e;--muted:#5f6563;--line:#cbcfcd;--paper:#fbfdfc;--soft:#eef1f0;--accent:#5f6563;--accent-soft:#e6e9e8;--selection-line:#7c8481;--max:1100px;--sidebar:240px;--content:720px;--shadow:0 12px 28px #1519231a}:root[data-theme=dark]{--ink:#eceeed;--text:#adb5b2;--muted:#adb5b2;--line:#444947;--paper:#101211;--soft:#202221;--accent:#adb5b2;--accent-soft:#272a29;--selection-line:#717d79;--shadow:0 12px 28px #00000042;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--paper);word-break:keep-all;margin:0;font-family:Noto Sans KR,system-ui,sans-serif;line-height:1.68}a{color:inherit;text-decoration:none}button,input{font:inherit}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--selection-line);outline-offset:3px}[hidden]{display:none!important}.wrap{width:min(100% - 40px,1080px);margin:0 auto}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}h1,h2,h3,p{margin-top:0}.site-header{z-index:30;background:color-mix(in srgb, var(--paper) 94%, transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(14px);position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:24px;width:100%;min-height:64px;padding:0 40px 0 20px;display:flex}.name{letter-spacing:-.01em;font-size:.9rem;font-weight:750}.nav{color:var(--muted);align-items:center;gap:12px;font-size:.84rem;display:flex}.projects-link{color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:7px 12px;font-weight:650;transition:transform .2s,background .2s,border-color .2s}.projects-link:hover{border-color:var(--selection-line);background:var(--soft);transform:translateY(-1px)}.header-socials{align-items:center;gap:3px;margin-left:2px;display:flex}.header-social-icon{background:0 0;border:1px solid #0000;border-radius:50%;place-items:center;width:34px;height:34px;transition:transform .2s,background .2s;display:grid}.header-social-icon:hover{background:var(--soft);transform:translateY(-2px)}.header-social-icon svg{fill:currentColor;stroke:none;width:17px;height:17px}.header-social-icon[aria-label=Email]{color:#ea4335}.header-social-icon[aria-label=Email] svg{fill:none;stroke:currentColor;stroke-width:1.7px}.header-social-icon[aria-label=GitHub]{color:#181717}.header-social-icon[aria-label=LinkedIn]{color:#0a66c2}.header-social-icon[aria-label=YouTube]{color:red}.header-social-icon .play{fill:#fff}:root[data-theme=dark] .header-social-icon[aria-label=GitHub]{color:#f2f4f7}.theme-toggle{width:34px;height:34px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:50%;place-items:center;padding:0;display:grid}.theme-toggle:hover{color:var(--ink);background:var(--soft)}.theme-toggle svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;width:17px;height:17px}.moon-icon,:root[data-theme=dark] .sun-icon{display:none}:root[data-theme=dark] .moon-icon{display:block}.notes-page-shell{grid-template-columns:var(--sidebar) minmax(0, 1fr);background:linear-gradient(to right, var(--soft) 0 calc(var(--sidebar) - 1px), var(--line) calc(var(--sidebar) - 1px) var(--sidebar), var(--paper) var(--sidebar));gap:0;width:100%;min-height:calc(100vh - 64px);margin:0;display:grid}.notes-sidebar{align-self:start;min-height:calc(100vh - 64px);padding:54px 20px 32px;position:sticky;top:64px}.sidebar-search{height:40px;color:var(--muted);border:1px solid var(--line);background:var(--paper);align-items:center;gap:9px;margin-bottom:31px;padding:0 11px;display:flex}.sidebar-search:focus-within{border-color:var(--accent);background:var(--paper)}.sidebar-search svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;flex:none;width:16px;height:16px}.sidebar-search input{width:100%;min-width:0;color:var(--ink);background:0 0;border:0;outline:0;padding:0;font-size:.75rem}.sidebar-search input::placeholder{color:var(--muted)}.sidebar-label{color:var(--muted);letter-spacing:.13em;text-transform:uppercase;margin-bottom:10px;font-size:.63rem;font-weight:700}.sidebar-nav{gap:6px;display:grid}.sidebar-nav a{color:var(--text);font-size:.75rem;transition:color .15s,background .15s,border-color .15s}.all-notes-link{border-left:2px solid #0000;justify-content:space-between;align-items:center;gap:10px;padding:9px 10px;display:flex}.sidebar-nav a:hover{color:var(--ink);background:color-mix(in srgb, var(--accent-soft) 65%, var(--paper))}.sidebar-nav a.active{color:var(--ink);border-left-color:var(--selection-line);background:var(--accent-soft);font-weight:650}.sidebar-nav small{color:var(--muted);font-size:.64rem;font-weight:500}.category-tree{gap:2px;display:grid}.category-folder{border-bottom:1px solid color-mix(in srgb, var(--line) 72%, transparent)}.category-folder summary{color:var(--text);cursor:pointer;grid-template-columns:15px minmax(0,1fr) auto 14px;align-items:center;gap:7px;padding:9px 8px;list-style:none;display:grid}.category-folder summary::-webkit-details-marker{display:none}.category-folder summary:hover{color:var(--ink);background:color-mix(in srgb, var(--accent-soft) 65%, var(--paper))}.category-folder summary strong{text-overflow:ellipsis;white-space:nowrap;font-size:.75rem;font-weight:600;overflow:hidden}.category-folder summary svg{fill:none;stroke:currentColor;stroke-width:1.7px;width:14px;height:14px;transition:transform .18s}.category-folder[open] summary svg{transform:rotate(180deg)}.folder-icon{border:1px solid var(--selection-line);border-radius:1px;width:14px;height:10px;position:relative}.folder-icon:before{content:"";border:1px solid var(--selection-line);border-bottom:0;border-radius:1px 1px 0 0;width:6px;height:3px;position:absolute;top:-4px;left:1px}.category-children{gap:1px;padding:0 0 8px 21px;display:grid}.category-children a{border-left:1px solid var(--line);justify-content:space-between;align-items:center;gap:8px;padding:6px 8px 6px 14px;display:flex;position:relative}.category-children a:before{content:"";border-top:1px solid var(--line);width:8px;position:absolute;top:50%;left:0}.category-children a.active{border-left-color:var(--selection-line)}.mobile-notes-nav{display:none}.notes-listing{width:100%;min-width:0;max-width:none;padding:42px 40px 64px}.listing-header{border-bottom:2px solid var(--ink);justify-content:space-between;align-items:end;gap:28px;min-height:98px;margin-bottom:31px;padding-bottom:22px;display:flex}.listing-header p{color:var(--accent);letter-spacing:.12em;text-transform:uppercase;margin-bottom:7px;font-size:.68rem;font-weight:750}.listing-header h1{letter-spacing:-.055em;margin:0;font-size:clamp(2rem,4vw,3rem);line-height:1.1}.listing-header>span{color:var(--muted);padding-bottom:3px;font-size:.72rem}.category-listing-header{align-items:end;min-height:76px;margin-bottom:24px}.note-card-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px 18px;display:grid}.note-card{border:1px solid var(--line);background:var(--paper);flex-direction:column;min-width:0;transition:transform .2s,box-shadow .2s,border-color .2s;display:flex}.note-card:hover{border-color:color-mix(in srgb, var(--accent) 42%, var(--line));box-shadow:var(--shadow);transform:translateY(-3px)}.card-cover{aspect-ratio:16/8.7;color:#fff;background:#172033;display:block;position:relative;overflow:hidden}.cover-localization-slam{background:#123d46}.cover-planning-control{background:#312a48}.cover-ros2-systems{background:#3d3028}.cover-grid{opacity:.18;background-image:linear-gradient(#ffffff59 1px,#0000 1px),linear-gradient(90deg,#ffffff59 1px,#0000 1px);background-size:28px 28px;position:absolute;inset:0;mask-image:linear-gradient(90deg,#000,#0000 88%)}.card-cover svg{fill:none;stroke:#ffffffad;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;vector-effect:non-scaling-stroke;width:100%;height:100%;position:absolute;inset:0}.card-cover svg circle{fill:var(--accent);stroke:#fff}.card-cover>span:last-child{color:#fff;backdrop-filter:blur(6px);background:#0000003d;border:1px solid #ffffff73;padding:4px 7px;font-size:.61rem;font-weight:650;position:absolute;bottom:12px;left:13px}.card-body{flex-direction:column;flex:1;min-height:194px;padding:15px 15px 13px;display:flex}.card-meta{color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-bottom:9px;font-size:.59rem;display:flex}.card-meta span{color:var(--accent);font-weight:650}.card-body h2{letter-spacing:-.03em;margin-bottom:8px;font-size:.98rem;line-height:1.42}.card-body h2 a:hover{color:var(--accent)}.card-body>p{color:var(--text);-webkit-line-clamp:3;-webkit-box-orient:vertical;margin-bottom:16px;font-size:.71rem;display:-webkit-box;overflow:hidden}.card-foot{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-top:auto;padding-top:10px;font-size:.59rem;display:flex}.card-foot>span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.card-foot a{color:var(--ink);flex:none;font-weight:650}.card-foot a:hover{color:var(--accent)}.search-empty,.empty-category{color:var(--muted);border:1px solid var(--line);background:var(--soft);text-align:center;padding:48px 24px;font-size:.8rem}.empty-category strong{color:var(--ink);margin-bottom:6px;font-size:.95rem;display:block}.empty-category p{margin:0}.article-shell{grid-template-columns:var(--sidebar) minmax(0, 1fr)}.article-main{width:100%;min-width:0;max-width:var(--max);padding:54px 40px 100px}.article-header{border-bottom:1px solid var(--line);max-width:850px;padding:8px 0 41px}.back-link{color:var(--muted);margin-bottom:30px;font-size:.72rem;display:inline-block}.back-link:hover{color:var(--accent)}.article-category{color:var(--accent);letter-spacing:.06em;margin-bottom:12px;font-size:.69rem;font-weight:700}.article-header h1{letter-spacing:-.052em;margin-bottom:19px;font-size:clamp(2rem,4.7vw,3.4rem);line-height:1.18}.article-lead{max-width:760px;color:var(--text);font-size:.98rem}.article-meta{color:var(--muted);flex-wrap:wrap;gap:10px;margin-top:23px;font-size:.68rem;display:flex}.article-meta span+span:before{content:"·";margin-right:10px}.article-layout{grid-template-columns:minmax(0, var(--content)) 180px;gap:48px;display:grid}.article{min-width:0;color:var(--text);padding:18px 0 95px}.article h2{color:var(--ink);letter-spacing:-.035em;margin:52px 0 16px;scroll-margin-top:86px;font-size:1.48rem}.article h3{color:var(--ink);margin:34px 0 12px;scroll-margin-top:86px;font-size:1.1rem}.article p,.article li{font-size:.94rem}.article li+li{margin-top:5px}.article a{color:var(--accent);text-underline-offset:3px;text-decoration:underline}.article code{background:var(--soft);border-radius:3px;padding:2px 5px;font-size:.88em}.article pre{color:#e4e7ec;border:1px solid var(--line);background:#111827;padding:20px;overflow-x:auto}.article pre code{background:0 0;padding:0}.article blockquote{border-left:3px solid var(--accent);background:var(--accent-soft);margin:28px 0;padding:16px 20px}.article img{max-width:100%;height:auto}.article-toc{border-left:1px solid var(--line);align-self:start;margin-top:52px;padding-left:16px;position:sticky;top:96px}.article-toc>p{color:var(--ink);margin-bottom:11px;font-size:.69rem;font-weight:700}.article-toc ol{margin:0;padding:0;list-style:none}.article-toc li{color:var(--muted);margin:7px 0;font-size:.66rem;line-height:1.55}.article-toc li.depth-3{padding-left:10px}.article-toc a:hover{color:var(--accent)}.site-footer{color:var(--muted);border-top:1px solid var(--line);background:var(--soft);padding:13px 0;font-size:.69rem}.footer-inner{justify-content:flex-start;align-items:center;display:flex}@media (width<=1050px){.header-inner{padding-right:32px}.notes-listing,.article-main{padding-left:32px;padding-right:32px}.note-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.article-layout{grid-template-columns:minmax(0,1fr)}.article-toc{display:none}}@media (width<=820px){.header-inner{padding-left:14px;padding-right:14px}.notes-page-shell{background:var(--paper);width:min(100% - 28px,720px);min-height:0;margin:0 auto;padding:28px 0 76px;display:block}.notes-sidebar{display:none}.notes-listing,.article-main{max-width:none;padding:0}.mobile-notes-nav{border:1px solid var(--line);background:var(--paper);margin-bottom:38px;display:block}.mobile-notes-nav summary{cursor:pointer;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:13px 14px;list-style:none;display:grid}.mobile-notes-nav summary::-webkit-details-marker{display:none}.mobile-notes-nav summary>span{color:var(--muted);font-size:.68rem}.mobile-notes-nav summary strong{text-align:right;font-size:.78rem}.mobile-notes-nav summary svg{fill:none;stroke:currentColor;stroke-width:2px;width:16px;height:16px;transition:transform .2s}.mobile-notes-nav[open] summary svg{transform:rotate(180deg)}.mobile-notes-nav>div{border-top:1px solid var(--line);padding:13px}.mobile-notes-nav .sidebar-search{margin-bottom:13px}.listing-header{min-height:0}.article-header{padding-top:0}}@media (width>=1051px) and (width<=1450px){.note-card-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (width<=640px){.wrap{width:min(100% - 28px,1080px)}.header-inner{min-height:58px}.nav{gap:3px;font-size:.7rem}.projects-link{margin-right:2px;padding:6px 9px}.header-socials{gap:0;margin-left:0}.header-social-icon{width:29px;height:29px}.header-social-icon svg{width:15px;height:15px}.theme-toggle{width:30px;height:30px}.listing-header{margin-bottom:24px}.listing-header h1{font-size:2.25rem}.listing-header>span{display:none}.note-card-grid{grid-template-columns:1fr;gap:20px}.card-body{min-height:188px}.article-header h1{font-size:2.15rem}.article-meta{display:block}.article-meta span{display:inline}}@media (width<=440px){.header-inner{gap:6px}.name{white-space:nowrap;font-size:.73rem}.projects-link{padding-left:7px;padding-right:7px}.header-social-icon,.theme-toggle{width:27px;height:27px}}