:root{
  --ground:#fbfbfe;
  --panel:#ffffff;
  --inset:#f3f3f9;
  --ink:#33343e;
  --text:#555663;
  --ink-2:#5e5f6d;
  --ink-3:#8d8e9e;
  --rule:#e6e6f0;
  --rule-2:#d2d2e2;

  --accent:#4338ca;
  --accent-ink:#3b31b4;
  --accent-soft:#7c73ea;
  --accent-wash:rgba(67,56,202,0.075);
  --accent-line:rgba(67,56,202,0.22);

  --shadow-1:0 1px 2px rgba(24,20,60,.05), 0 6px 20px -12px rgba(24,20,60,.22);
  --shadow-2:0 2px 6px rgba(24,20,60,.06), 0 24px 48px -28px rgba(24,20,60,.35);

  --sans:"Geist",-apple-system,BlinkMacSystemFont,"Segoe UI",
         "Apple SD Gothic Neo","Pretendard",sans-serif;
  --display:"Garamond","EB Garamond",Georgia,serif;
  --display-text:var(--sans);
  --mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;

  --code:"SF Mono",Monaco,Consolas,monospace;

  --text-w:690px;
  --wide-w:1040px;
  --rail-w:262px;
  --head-h:56px;
  --gutter:28px;

  --fig-max:880px;
  --fig-w:max(100%, min(var(--fig-max),
    calc(100vw - 2 * var(--gutter) - 120px)));

  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-io:cubic-bezier(.65,.02,.28,1);
}

:root[data-theme="dark"]{
  --ground:#0a0a11;
  --panel:#111119;
  --inset:#171722;
  --ink:#e9e9f4;
  --text:#c6c6d8;
  --ink-2:#a3a3bd;
  --ink-3:#6e6e8b;
  --rule:#212130;
  --rule-2:#323245;

  --accent:#8b83f7;
  --accent-ink:#a49df9;
  --accent-soft:#6f66e0;
  --accent-wash:rgba(139,131,247,0.10);
  --accent-line:rgba(139,131,247,0.28);

  --shadow-1:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -14px rgba(0,0,0,.7);
  --shadow-2:0 2px 8px rgba(0,0,0,.45), 0 28px 56px -30px rgba(0,0,0,.85);
}

*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scrollbar-color:var(--rule-2) transparent;
}
body{
  margin:0;
  background:var(--ground);
  color:var(--text);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.72;
  letter-spacing:-0.009em;
  font-feature-settings:"liga" 1,"calt" 1;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  transition:background .5s var(--ease), color .5s var(--ease);
}
::selection{background:var(--accent-wash); color:var(--ink);}
:where(a,button,summary):focus-visible{
  outline:2px solid var(--accent); outline-offset:3px; border-radius:3px;
}

body::before{
  content:""; position:fixed; inset:0 0 auto; height:520px; z-index:0;
  pointer-events:none; opacity:.75;
  background:
    radial-gradient(760px 320px at 22% -12%, var(--accent-wash), transparent 70%),
    radial-gradient(620px 280px at 88% -18%, rgba(124,115,234,.09), transparent 70%);
}

.progress{
  position:fixed; top:0; left:0; right:0; height:2px; z-index:60;
  background:transparent;
}
.progress span{
  display:block; height:100%; width:0;
  background:linear-gradient(90deg,var(--accent),var(--accent-soft));
  transform-origin:0 50%;
  transition:width .12s linear;
}

.masthead{
  position:sticky; top:0; z-index:50;
  height:var(--head-h);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  background:color-mix(in srgb, var(--ground) 78%, transparent);
  border-bottom:1px solid transparent;
  transition:border-color .35s var(--ease), background .35s var(--ease);
}
.masthead.is-stuck{border-bottom-color:var(--rule);}
.masthead-in{
  height:100%; max-width:calc(var(--wide-w) + 2 * var(--gutter) + 80px);
  margin:0 auto; padding:0 var(--gutter);
  display:flex; align-items:center; justify-content:space-between; gap:16px;
}
.brand{
  display:inline-flex; align-items:center; gap:10px;
  text-decoration:none; color:var(--ink);
}
.brand-mark{
  display:grid; grid-template-columns:1fr 1fr; gap:2px;
  width:17px; height:17px; flex:none;
}
.brand-mark i{
  display:block; border-radius:1.5px; background:var(--accent);
  transition:opacity .5s var(--ease), transform .5s var(--ease);
}
.brand-mark i:nth-child(1){opacity:1;}
.brand-mark i:nth-child(2){opacity:.55;}
.brand-mark i:nth-child(3){opacity:.55;}
.brand-mark i:nth-child(4){opacity:.3;}
.brand:hover .brand-mark i:nth-child(2){opacity:1; transform:translateY(-1px);}
.brand:hover .brand-mark i:nth-child(3){opacity:1; transform:translateY(1px);}
.brand:hover .brand-mark i:nth-child(4){opacity:.7;}
.brand-name{
  font-family:var(--sans); font-size:14.5px; font-weight:600; letter-spacing:-0.021em;
}
.masthead-right{display:flex; align-items:center; gap:14px; min-width:0;}
.page-nav{
  display:flex; align-items:center; gap:2px; flex:none;
  padding:2px; border:1px solid var(--rule); border-radius:8px;
  background:color-mix(in srgb, var(--panel) 64%, transparent);
}
.page-nav a{
  min-height:26px; display:inline-flex; align-items:center;
  padding:0 8px; border-radius:5px;
  font-family:var(--mono); font-size:10.5px; letter-spacing:.04em;
  color:var(--ink-3); text-decoration:none;
  transition:color .2s var(--ease), background .2s var(--ease);
}
.page-nav a:hover{color:var(--ink);}
.page-nav a[aria-current="page"]{color:var(--accent-ink); background:var(--accent-wash);}
.toggle{
  width:32px; height:32px; flex:none; display:grid; place-items:center;
  position:relative; cursor:pointer; color:var(--ink-2);
  background:transparent; border:1px solid var(--rule); border-radius:8px;
  transition:color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.toggle:hover{color:var(--accent-ink); border-color:var(--accent-line); background:var(--accent-wash);}
.toggle svg{
  position:absolute; width:16px; height:16px; fill:none;
  stroke:currentColor; stroke-width:1.6; stroke-linecap:round;
  transition:opacity .35s var(--ease), transform .45s var(--ease);
}
.toggle .i-sun{opacity:0; transform:rotate(-70deg) scale(.6);}
.toggle .i-moon{opacity:1; transform:none;}
[data-theme="dark"] .toggle .i-sun{opacity:1; transform:none;}
[data-theme="dark"] .toggle .i-moon{opacity:0; transform:rotate(70deg) scale(.6);}

.shell{
  position:relative; z-index:1;
  max-width:calc(var(--wide-w) + 2 * var(--gutter) + 80px);
  margin:0 auto; padding:0 var(--gutter);
}

.rail{
  position:fixed; top:var(--head-h); right:0; bottom:0; z-index:44;
  width:190px; display:flex; align-items:center; justify-content:flex-end;
  pointer-events:none;
}
.rail-ticks{
  pointer-events:auto;
  display:flex; flex-direction:column; align-items:flex-end; gap:6px;
  padding:18px 14px 18px 40px;
  border:0; background:transparent; cursor:pointer;
}
.tick{
  display:block; height:2px; border-radius:2px;
  background:var(--rule-2);
  transition:width .3s var(--ease), background .3s var(--ease), opacity .3s var(--ease);
  opacity:.85;
}
.tick--h1{width:16px;}
.tick--h2{width:11px;}
.tick--h3{width:7px;}
.tick.on{background:var(--accent); opacity:1;}
.tick--h1.on{width:22px;}
.tick--h2.on{width:17px;}
.tick--h3.on{width:13px;}
.rail.on .tick{opacity:.35;}
.rail.on .tick.on{opacity:.8;}

.rail-panel{
  position:absolute; right:34px; top:50%;
  transform:translate(10px,-50%) scale(.985);
  transform-origin:100% 50%;
  width:var(--rail-w); max-height:calc(100vh - var(--head-h) - 64px);
  background:color-mix(in srgb, var(--panel) 90%, transparent);
  backdrop-filter:saturate(180%) blur(16px);
  -webkit-backdrop-filter:saturate(180%) blur(16px);
  border:1px solid var(--rule); border-radius:12px;
  box-shadow:var(--shadow-2);
  opacity:0; pointer-events:none;
  transition:opacity .28s var(--ease), transform .38s var(--ease);
}
.rail.on .rail-panel{
  opacity:1; pointer-events:auto; transform:translate(0,-50%) scale(1);
}
.rail-in{
  position:relative;
  max-height:calc(100vh - var(--head-h) - 66px);
  overflow-y:auto; overscroll-behavior:contain;
  padding:18px 16px 20px 20px;
  scrollbar-width:thin;
}
.rail-in::-webkit-scrollbar{width:6px;}
.rail-in::-webkit-scrollbar-thumb{background:var(--rule); border-radius:3px;}
.rail-in::-webkit-scrollbar-thumb:hover{background:var(--rule-2);}
.rail-label{
  font-family:var(--mono); font-size:10px; font-weight:500;
  letter-spacing:0.18em; text-transform:uppercase; color:var(--ink-3);
  margin:0 0 14px;
}
.toc-list{list-style:none; margin:0; padding:0;}
.toc-item a{
  display:block; text-decoration:none;
  color:var(--ink-3); font-size:13px; line-height:1.45;
  padding:5px 0 5px 2px;
  transition:color .25s var(--ease), transform .25s var(--ease);
}
.toc-item a:hover{color:var(--ink); transform:translateX(2px);}
.toc-item--h1 a{
  color:var(--ink-2); font-weight:600; font-size:13.5px;
  letter-spacing:-0.01em; margin-top:14px;
}
.toc-item--h1:first-child a{margin-top:0;}
.toc-item--h3 a{padding-left:14px; font-size:12.5px; color:var(--ink-3);}
.toc-item a.on{color:var(--accent-ink); font-weight:560;}
.toc-item--h1 a.on{color:var(--accent-ink);}

.rail-marker{
  position:absolute; left:0; top:0; width:2px; height:0;
  background:var(--accent); border-radius:2px;
  opacity:0;
  transition:transform .42s var(--ease-io), height .42s var(--ease-io), opacity .3s var(--ease);
}
.rail-rule{
  position:absolute; left:0; top:34px; bottom:4px; width:1px;
  background:var(--rule);
}

.main{padding:0 0 96px; min-width:0;}
.post,.foot{max-width:var(--text-w); margin-left:auto; margin-right:auto;}

.post-head{padding:86px 0 44px; border-bottom:1px solid var(--rule); margin-bottom:44px;}
.post-title{
  margin:0; text-align:center;
  font-size:clamp(2.9rem,1.85rem + 3vw,4.1rem);
  font-family:"Instrument Serif",Georgia,serif;
  font-style:italic;
  line-height:1.06; font-weight:400; letter-spacing:-0.02em;
  text-wrap:balance;
}

.post > h1,.post > h2,.post > h3,.post > h4,.post > h5{
  position:relative; scroll-margin-top:calc(var(--head-h) + 26px);
  font-family:var(--display-text);
  letter-spacing:-0.026em; text-wrap:balance; color:var(--ink);
}
.post > h1{
  font-size:2.38rem; line-height:1.16; font-weight:700;
  margin:68px 0 22px;
}
.post > h2{font-size:1.82rem; line-height:1.24; font-weight:680; margin:50px 0 19px;}
.post > h3{font-size:1.4rem; line-height:1.31; font-weight:670; margin:38px 0 15px; letter-spacing:-0.018em;}
.post > h4{font-size:1.18rem; line-height:1.37; font-weight:750; margin:30px 0 12px; letter-spacing:-0.012em;}
.post > h5{font-size:1.05rem; line-height:1.42; font-weight:750; margin:26px 0 10px; letter-spacing:-0.008em;}
.post > :is(h1,h2,h3,h4,h5) + :is(h1,h2,h3,h4,h5){margin-top:20px;}
.post > *:first-child{margin-top:0;}

.anchor{
  position:absolute; left:-24px; top:50%; transform:translateY(-50%);
  width:22px; text-align:left; color:var(--rule-2); text-decoration:none;
  font-family:var(--mono); font-weight:400; font-size:0.78em;
  opacity:0; transition:opacity .22s var(--ease), color .22s var(--ease);
}
.post > h1 .anchor{top:auto; bottom:0; transform:translateY(-14%);}
.anchored:hover .anchor{opacity:1;}
.anchor:hover{color:var(--accent);}

.post p{margin:0 0 22px; text-wrap:pretty;}
.post p + p{margin-top:-2px;}

.post a{
  color:var(--ink); text-decoration:none;
  background-image:linear-gradient(var(--accent-line),var(--accent-line));
  background-size:100% 1px; background-repeat:no-repeat; background-position:0 100%;
  padding-bottom:1px;
  transition:color .2s var(--ease), background-size .28s var(--ease);
}
.post a:hover{color:var(--accent-ink); background-size:100% 2px;}

.post strong{font-weight:645; color:var(--ink);}
.post em{font-style:italic;}

.post ul,.post ol{margin:0 0 22px; padding-left:1.35em;}
.post li{margin:6px 0; padding-left:4px;}
.post li::marker{color:var(--ink-3); font-size:.92em;}
.post ol{counter-reset:none;}
.post li > ul,.post li > ol{margin:6px 0 6px;}

.post :not(pre) > code{
  font-family:var(--code); font-size:0.855em; letter-spacing:-0.005em;
  padding:0.13em 0.32em; border-radius:4px;
  background:var(--inset); border:1px solid var(--rule);
  color:var(--accent-ink);
  word-break:break-word;
}

hr{border:0; height:1px; background:var(--rule); margin:56px 0;}

.code{

  --tn-bg:#f4f4f9;
  --tn-bar:#ebebf3;
  --tn-edge:#e0e0ec;
  --tn-fg:#3b3f52;
  --tn-dim:#6f7591;
  --tn-gut:#8b91ad;
  --tn-hover:rgba(24,20,60,.055);
  --tn-thumb:#d2d2e2;

  --t-comment:#616785;
  --t-string:#3f7d20;
  --t-key:#7c3aed;
  --t-class:#a05a00;
  --t-builtin:#0b7285;
  --t-num:#b1500a;
  --t-fn:#2559c9;

  margin:26px 0 30px;
  background:var(--tn-bg);
  border:1px solid var(--tn-edge);
  border-radius:10px;
  overflow:hidden;
  box-shadow:var(--shadow-1);
}
:root[data-theme="dark"] .code{
  --tn-bg:#0a0a0a;
  --tn-bar:#141419;
  --tn-edge:#22222c;
  --tn-fg:#e8ebe8;
  --tn-dim:#9da39f;
  --tn-gut:#565f89;
  --tn-hover:rgba(255,255,255,.06);
  --tn-thumb:#2b2b36;

  --t-comment:#565f89;
  --t-string:#9ece6a;
  --t-key:#bb9af7;
  --t-class:#e0af68;
  --t-builtin:#2ac3de;
  --t-num:#ff9e64;
  --t-fn:#7aa2f7;
}
.code figcaption{
  display:flex; align-items:center; gap:12px;
  padding:0 8px 0 14px; height:40px;
  border-bottom:1px solid var(--tn-edge);
  background:var(--tn-bar);
}
.code .lights{display:flex; gap:7px; flex:none;}
.code .lights i{display:block; width:11px; height:11px; border-radius:50%;}
.code .lights i:nth-child(1){background:#ec6a5e;}
.code .lights i:nth-child(2){background:#f4bf4f;}
.code .lights i:nth-child(3){background:#61c454;}
.code .lang{
  flex:1; min-width:0;
  font-family:var(--sans); font-size:12.5px; font-weight:500;
  letter-spacing:-0.006em; color:var(--tn-dim);
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}
.code .copy{
  flex:none;
  font-family:var(--sans); font-size:12px;
  color:var(--tn-dim); background:transparent; border:1px solid transparent;
  border-radius:5px; padding:4px 9px; cursor:pointer;
  opacity:0; transition:opacity .22s var(--ease), color .22s var(--ease),
    border-color .22s var(--ease), background .22s var(--ease);
}
.code:hover .copy,.code .copy:focus-visible{opacity:1;}
.code .copy:hover{color:var(--tn-fg); border-color:var(--tn-edge); background:var(--tn-hover);}
.code .copy.done{opacity:1; color:var(--t-string);}

.code-body{display:flex; align-items:stretch;}
.code .gutter{
  flex:none; padding:14px 12px 16px 16px;
  text-align:right; color:var(--tn-gut);
  border-right:1px solid var(--tn-edge);
  user-select:none; -webkit-user-select:none;
}
.code .gutter span{display:block;}
.code-scroll{flex:1; min-width:0; overflow-x:auto; scrollbar-width:thin;}
.code .gutter,.code pre{
  font-family:var(--code); font-size:12.8px; line-height:1.5;
  font-variant-ligatures:none;
}
.code pre{margin:0; padding:14px 18px 16px;}
.code code{
  font-family:inherit; font-size:inherit; line-height:inherit;
  color:var(--tn-fg); tab-size:4;
}
.code-scroll::-webkit-scrollbar{height:8px;}
.code-scroll::-webkit-scrollbar-thumb{background:var(--tn-thumb); border-radius:4px;}
.code-scroll::-webkit-scrollbar-track{background:transparent;}

.code--sketch{box-shadow:none; border-color:transparent;}
.code--sketch .code-scroll{padding:2px 0;}
.code--sketch code{color:var(--tn-dim);}

.t-c{color:var(--t-comment); font-style:italic;}
.t-s{color:var(--t-string);}
.t-k{color:var(--t-key);}
.t-nc{color:var(--t-class);}
.t-b{color:var(--t-builtin);}
.t-d{color:var(--t-class);}
.t-n{color:var(--t-num);}
.t-f{color:var(--t-fn);}

.callout{
  margin:28px 0; padding:18px 22px 6px;
  background:var(--accent-wash);
  border:1px solid var(--accent-line);
  border-radius:10px;
}
.callout .callout-title{
  margin:0 0 10px; font-size:12.5px; font-weight:640;
  letter-spacing:0.02em; color:var(--accent-ink);
  text-wrap:pretty;
}
.callout > *:last-child{margin-bottom:16px;}
.callout p{font-size:0.955em; color:var(--ink-2);}
.callout strong{color:var(--ink);}
.callout .code{margin:16px 0; box-shadow:none;}
.callout .shot{margin:16px 0;}

blockquote{
  margin:28px 0; padding:2px 0 2px 22px;
  border-left:2px solid var(--rule-2); color:var(--ink-2);
}
blockquote p:last-child{margin-bottom:0;}

.article-logo{margin:4px 0 32px;}
.article-logo img{
  display:block; width:112px; height:auto; margin:0 auto;
}
.article-logo + h2{margin-top:32px;}

.shot{margin:30px 0; }
.shot a{display:block; background:none; padding:0;}
.shot img{
  display:block; margin:0 auto;
  max-width:100%; max-height:560px; width:auto; height:auto;
  border:1px solid var(--rule); border-radius:16px;
  background:var(--panel);
  box-shadow:var(--shadow-1);
  transition:box-shadow .4s var(--ease), transform .4s var(--ease);
}
.shot a:hover img{box-shadow:var(--shadow-2); transform:translateY(-2px);}

.figure{
  margin:28px calc((100% - var(--fig-w)) / 2) 32px;
  opacity:0; transform:translateY(10px);
  transition:opacity .7s var(--ease), transform .7s var(--ease);
}
.figure.in{opacity:1; transform:none;}

.figure{overflow:hidden;}

.figure iframe{
  display:block; width:100%; margin:0 auto; border:0; background:transparent;
  transition:height .35s var(--ease-io), width .35s var(--ease-io);
}

.foot{
  margin-top:80px; padding-top:26px; border-top:1px solid var(--rule);
  color:var(--ink-3); font-size:14px;
}
.foot p{margin:0 0 6px;}
.foot-meta{font-family:var(--mono); font-size:11.5px;}
.foot-meta code{font-size:11px; color:var(--ink-2);}
.foot a{color:var(--ink-3); text-decoration:none; border-bottom:1px solid var(--rule-2);}
.foot a:hover{color:var(--accent-ink); border-color:var(--accent-line);}

.totop{
  position:fixed; right:26px; bottom:26px; z-index:40;
  width:38px; height:38px; display:grid; place-items:center;
  border-radius:10px; cursor:pointer; color:var(--ink-2);
  background:color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
  border:1px solid var(--rule); box-shadow:var(--shadow-1);
  opacity:0; transform:translateY(10px) scale(.94); pointer-events:none;
  transition:opacity .35s var(--ease), transform .35s var(--ease),
    color .25s var(--ease), border-color .25s var(--ease);
}
.totop.on{opacity:1; transform:none; pointer-events:auto;}
.totop:hover{color:var(--accent-ink); border-color:var(--accent-line);}
.totop svg{width:15px; height:15px; fill:none; stroke:currentColor; stroke-width:1.7; stroke-linecap:round; stroke-linejoin:round;}

.rail-open{
  display:none; align-items:center; gap:7px;
  font-family:var(--mono); font-size:11px; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--ink-2);
  background:transparent; border:1px solid var(--rule); border-radius:8px;
  height:32px; padding:0 10px; cursor:pointer;
  transition:color .25s var(--ease), border-color .25s var(--ease);
}
.rail-open:hover{color:var(--accent-ink); border-color:var(--accent-line);}
.scrim{
  position:fixed; inset:0; z-index:45; background:rgba(10,10,17,.42);
  opacity:0; pointer-events:none; transition:opacity .3s var(--ease);
  backdrop-filter:blur(2px);
}
.scrim.on{opacity:1; pointer-events:auto;}

@media (max-width:1000px){
  :root{--text-w:100%;}
  .shell{padding:0 24px; max-width:760px; --gutter:24px;}

  .rail{
    top:0; width:300px; z-index:46; display:block;
    transform:translateX(101%); transition:transform .38s var(--ease-io);
  }
  .rail.on{transform:none;}
  .rail-ticks{display:none;}
  .rail .rail-panel,
  .rail.on .rail-panel{
    position:absolute; inset:0; right:0; top:0;
    width:100%; max-height:none; height:100%;
    transform:none; opacity:1; pointer-events:auto;
    border-radius:0; border-width:0 0 0 1px;
    background:var(--panel);
  }
  .rail-in{max-height:100vh; height:100%; padding:26px 18px 40px 24px;}
  .rail-open{display:inline-flex;}
  .figure{--fig-w:calc(100% + 44px); margin:26px calc((100% - var(--fig-w)) / 2) 30px;}
  .post-head{padding-top:56px;}
  .anchor{display:none;}
}
@media (max-width:620px){
  body{font-size:16px;}
  .shell{padding:0 18px; --gutter:18px;}
  .masthead-in{padding:0 18px;}
  .brand-name{display:none;}
  .masthead-right{gap:8px;}
  .page-nav a{padding:0 7px;}
  .post > h1{margin-top:52px; font-size:2.05rem;}
  .post > h2{margin-top:40px; font-size:1.58rem;}
  .post > h3{font-size:1.32rem;}
  .post > h4{font-size:1.15rem;}
  .post > h5{font-size:1.02rem;}
  .figure{--fig-w:calc(100% + 30px); margin:22px calc((100% - var(--fig-w)) / 2) 26px;}
  .code pre{padding:14px;}
  .totop{right:16px; bottom:16px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{transition-duration:.01ms !important; animation-duration:.01ms !important;}
  .figure{opacity:1; transform:none;}
}

@media print{
  .masthead,.rail,.progress,.totop,.foot{display:none;}
  .shell{display:block; max-width:none; padding:0;}
  body::before{display:none;}
  .figure{break-inside:avoid;}
}