*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --paper:#F0EFEB;--paper-2:#E7E6E0;--card:#F7F6F2;--card-hi:#FCFBF7;--ink:#1A1A16;--body:#54534C;--muted:#656358;
  --line:rgba(26,26,20,.11);--line-2:rgba(26,26,20,.18);--ember:#E0531E;--ember-ink:#B83E0C;
  --mono:'IBM Plex Mono',ui-monospace,monospace;--display:'Bricolage Grotesque',system-ui,sans-serif;--sans:'Outfit',system-ui,sans-serif;
  --sh-1:0 1px 2px rgba(26,26,20,.04),0 2px 6px rgba(26,26,20,.05);
}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--body);font-family:var(--sans);line-height:1.65;font-weight:400;-webkit-font-smoothing:antialiased;font-size:16px}
a{color:var(--ember-ink);text-decoration:underline;text-underline-offset:2px;text-decoration-color:var(--line-2)}
a:hover{text-decoration-color:currentColor}
.wrap{max-width:760px;margin-inline:auto;padding:0 24px}

/* header */
.nav{position:sticky;top:14px;z-index:80;width:min(calc(100% - 28px),1100px);margin:14px auto 26px;
  display:flex;align-items:center;justify-content:space-between;gap:18px;padding:9px 9px 9px 20px;border-radius:999px;
  background:rgba(244,239,230,.72);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.5),inset 0 1px 0 rgba(255,255,255,.4),0 1px 2px rgba(26,26,20,.04),0 16px 34px -20px rgba(26,26,20,.2);
  -webkit-backdrop-filter:blur(20px) saturate(160%);backdrop-filter:blur(20px) saturate(160%)}
.brand{display:flex;align-items:center;gap:11px;font:600 18px/1 var(--sans);letter-spacing:-.02em;color:var(--ink);text-decoration:none}
.brand .pin{width:26px;height:26px;display:grid;place-items:center;border-radius:8px;background:var(--ember);box-shadow:inset 0 0 0 1px rgba(255,255,255,.22)}
.brand .pin svg{width:17px;height:17px}
.brand .fly{color:var(--ember)}
.btn-back{display:inline-flex;align-items:center;gap:10px;cursor:pointer;text-decoration:none;font:500 14px/1 var(--sans);color:var(--ink);
  background:rgba(252,250,245,.6);box-shadow:inset 0 0 0 1px var(--line-2),0 1px 2px rgba(26,26,20,.05);
  padding:7px 18px 7px 8px;border-radius:999px;transition:background .3s,box-shadow .3s,transform .4s cubic-bezier(.32,.72,0,1)}
.btn-back:hover{background:#FCFBF7;box-shadow:inset 0 0 0 1px var(--line-2),0 5px 14px -5px rgba(26,26,20,.14);transform:translateY(-1px)}
.btn-back .ico{width:30px;height:30px;flex-shrink:0;border-radius:50%;display:grid;place-items:center;background:rgba(33,26,18,.06);color:var(--ink);transition:transform .4s cubic-bezier(.16,1,.3,1),background .3s,color .3s}
.btn-back:hover .ico{background:rgba(224,83,30,.12);color:var(--ember);transform:translateX(-2px)}
.btn-back .ico svg{width:16px;height:16px}

/* document */
.doc{padding:clamp(40px,7vw,72px) 0 80px}
.eyebrow{font:500 11px/1 var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--ember-ink)}
h1{font-family:var(--display);font-weight:400;font-size:clamp(32px,6vw,48px);letter-spacing:-.02em;color:var(--ink);line-height:1.05;margin:16px 0 14px}
.updated{font:500 12.5px var(--mono);color:var(--muted)}
.lede{font-size:18px;color:var(--body);margin:22px 0 0;max-width:60ch}
.lede b{color:var(--ink);font-weight:600}

.toc{margin:34px 0 0;padding:18px 22px;background:var(--card);border:1px solid var(--line);border-radius:14px}
.toc h2{font:500 10px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.toc ol{list-style:none;counter-reset:t;columns:2;column-gap:28px}
.toc li{counter-increment:t;margin-bottom:7px;font-size:14px;break-inside:avoid}
.toc li::before{content:counter(t,decimal-leading-zero);color:var(--ember);font:500 11px var(--mono);margin-right:9px}
.toc a{color:var(--body);text-decoration:none}
.toc a:hover{color:var(--ember-ink)}
@media(max-width:560px){.toc ol{columns:1}}

section{margin-top:clamp(38px,6vw,52px);scroll-margin-top:80px}
h2.sec{font-family:var(--display);font-weight:400;font-size:clamp(22px,3.4vw,28px);color:var(--ink);letter-spacing:-.01em;display:flex;align-items:baseline;gap:12px;margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--line)}
h2.sec .n{font:500 13px var(--mono);color:var(--ember);flex-shrink:0}
h3{font:600 16px var(--sans);color:var(--ink);margin:22px 0 8px}
p{margin:0 0 14px;max-width:64ch}
ul,ol.list{margin:0 0 14px 0;padding-left:22px;max-width:64ch}
li{margin-bottom:8px}
strong,b{color:var(--ink);font-weight:600}
.note{background:rgba(224,83,30,.06);border:1px solid rgba(224,83,30,.2);border-radius:12px;padding:14px 18px;font-size:14.5px;margin:18px 0;color:var(--body)}
.note b{color:var(--ember-ink)}
.todo{background:#fffbe6;border:1px dashed #d9b400;border-radius:10px;padding:12px 16px;font-size:13.5px;color:#6b5800;margin:14px 0}

/* table */
.tbl{width:100%;border-collapse:collapse;margin:8px 0 18px;font-size:13.5px}
.tbl th,.tbl td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{font:500 11px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);border-bottom:1px solid var(--line-2)}
.tbl td code{font:500 12.5px var(--mono);color:var(--ink);background:var(--card-hi);padding:1px 5px;border-radius:5px;box-shadow:inset 0 0 0 1px var(--line)}
.tag{display:inline-block;font:500 10px var(--mono);letter-spacing:.04em;padding:2px 7px;border-radius:99px;white-space:nowrap}
.tag.nec{background:rgba(63,125,78,.12);color:#2f7d4e}
.tag.opt{background:rgba(224,83,30,.12);color:var(--ember-ink)}
.tbl-wrap{overflow-x:auto}
@media(max-width:560px){.tbl{font-size:12.5px}.tbl th,.tbl td{padding:9px 8px}}

.tm{font-size:.6em;vertical-align:.42em;line-height:0;font-weight:500;letter-spacing:0}
.footer{border-top:1px solid var(--line);padding:56px 0 40px;background:var(--paper-2);margin-top:40px;text-align:center}
.footer .wrap{max-width:1200px}
.footer .brand{display:inline-flex;font-size:21px;text-decoration:none}
.footer .brand .fly{color:var(--ember)}
.footer-tag{color:var(--body);font-size:15px;line-height:1.6;max-width:50ch;margin:16px auto 26px}
.footer-bar{display:flex;justify-content:space-between;align-items:center;gap:14px 28px;flex-wrap:wrap;
  max-width:780px;margin:0 auto;padding:13px 30px;border-radius:999px;background:rgba(244,239,230,.6);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.5),inset 0 1px 0 rgba(255,255,255,.4),0 1px 2px rgba(26,26,20,.05),0 14px 30px -18px rgba(26,26,20,.22);
  -webkit-backdrop-filter:blur(20px) saturate(160%);backdrop-filter:blur(20px) saturate(160%)}
@media(max-width:560px){.footer-bar{border-radius:26px;padding:16px 22px;justify-content:center;gap:10px 18px}}
.fb-copy{font:500 11.5px var(--mono);color:var(--muted)}
.fb-links{font-size:13.5px}
.fb-links a{color:var(--body);text-decoration:none;transition:color .3s}
.fb-links a:hover{color:var(--ember-ink)}
.fb-links .sep{color:var(--muted);padding:0 8px}
.footer-sub{font:500 11.5px var(--mono);color:var(--muted);margin:18px auto 0}
.footer-sub a{color:var(--body);text-decoration:none;transition:color .3s}
.footer-sub a:hover{color:var(--ember-ink)}
.footer-legal{max-width:920px;margin:26px auto 0;padding-top:24px;border-top:1px solid var(--line);text-align:left;color:var(--muted);font:400 11.5px/1.65 var(--sans)}
.footer-legal p{margin-bottom:9px;max-width:none}
.footer-legal p:last-child{margin-bottom:0}
.footer-legal b{color:var(--body);font-weight:600}
.footer-legal a{color:var(--body);text-decoration:underline;text-underline-offset:2px;text-decoration-color:var(--line-2)}
.footer-legal a:hover{color:var(--ember-ink);text-decoration-color:currentColor}
.footer-created{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font:500 11.5px var(--mono)}
.footer-created a{display:inline-flex;align-items:center}
.footer-created img{height:24px;width:auto;filter:brightness(0);opacity:.68;transition:opacity .3s}
.footer-created a:hover img{opacity:1}
.footer-created .si-text{color:var(--body);font:600 12px var(--sans);letter-spacing:-.01em}
.footer-created a:hover .si-text{color:var(--ember-ink)}