:root{--bg:#F7F7F4;--bg-blur:rgba(247,247,244,.92);--surface:#FFFFFF;--ink:#131A2E;--line:#E4E3DC;--line-strong:#DCDBD2;--muted:#5A5F70;--soft:#8A8A83;--accent:#2F4FD6;--accent-soft:#EAEEFB;--btn-bg:#131A2E;--btn-fg:#FFFFFF;--btn-weight:500;--ph:repeating-linear-gradient(135deg,#EDEDE6 0 10px,#F5F5F0 10px 20px);--invert-muted:#AEB7CC;--invert-line:#2A3454;--invert-accent:#5B8CFF;--footer-bg:#F7F7F4;--prose:#2C3345}

*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Instrument Sans',system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased;text-wrap:pretty}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--ink)}
img,svg{display:block}
.wrap{max-width:1160px;margin:0 auto;padding:0 32px}
.mono{font-family:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace}
.eyebrow{font-family:'IBM Plex Mono',ui-monospace,monospace;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--soft);margin:0 0 24px}
h1{font-size:clamp(38px,5.6vw,80px);line-height:1;letter-spacing:-.035em;font-weight:600;margin:0}
h2{font-size:clamp(28px,3.6vw,46px);line-height:1.05;letter-spacing:-.03em;font-weight:600;margin:0}
h3{font-size:21px;font-weight:600;letter-spacing:-.02em;margin:0}
p{line-height:1.6}
.lead{font-size:20px;line-height:1.55;color:var(--muted)}
.small{font-size:16px;line-height:1.6;color:var(--muted)}
header.site{position:sticky;top:0;z-index:40;border-bottom:1px solid var(--line);background:var(--bg-blur);backdrop-filter:blur(8px)}
header.site .bar{display:flex;align-items:center;justify-content:space-between;gap:28px;height:74px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink);white-space:nowrap;flex-shrink:0}
.brand:hover{color:var(--ink)}
.brand b{font-weight:600;font-size:19px;letter-spacing:-.02em}
.brand span{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--soft);letter-spacing:.06em}
nav.main{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
nav.main a{font-size:15px;font-weight:500;color:var(--ink);opacity:.62;padding-bottom:2px;border-bottom:1px solid transparent;white-space:nowrap}
nav.main a:hover{opacity:1}
nav.main a.on{opacity:1;border-bottom-color:currentColor}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;background:var(--btn-bg);color:var(--btn-fg);padding:15px 26px;font-size:16px;font-weight:var(--btn-weight);border:0;cursor:pointer;white-space:nowrap}
.btn:hover{color:var(--btn-fg);opacity:.9}
.btn.sm{padding:11px 20px;font-size:15px}
.btn-ghost{display:inline-flex;align-items:center;gap:10px;border:1px solid var(--line-strong);color:var(--ink);padding:14px 25px;font-size:16px;font-weight:500;background:transparent;cursor:pointer}
.btn-ghost:hover{color:var(--ink);border-color:var(--accent)}
section{padding:80px 0}
section.tight{padding:48px 0}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:64px}
.rule-grid{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.rule-grid.c3{grid-template-columns:repeat(3,minmax(0,1fr))}
.rule-grid.c4{grid-template-columns:repeat(4,minmax(0,1fr))}
.rule-grid>div{background:var(--bg);padding:30px 28px}
.panel{border:1px solid var(--line);background:var(--surface);padding:36px}
.panel.pad{padding:44px}
.card{border:1px solid var(--line-strong);background:var(--surface);padding:34px 30px;display:flex;flex-direction:column;gap:13px;color:var(--ink)}
.card:hover{border-color:var(--accent);color:var(--ink)}
.tag{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.1em;color:var(--accent)}
.ph{background:var(--ph);border:1px solid var(--line);display:grid;place-items:center}
.ph span{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.1em;color:var(--soft);text-transform:uppercase;text-align:center;padding:8px}
.invert{background:var(--ink);color:var(--bg)}
.invert h2,.invert h3{color:var(--bg)}
.invert p{color:var(--invert-muted)}
.invert .card{border-color:var(--invert-line);background:transparent;color:var(--bg)}
.invert .tag{color:var(--invert-accent)}
form label{display:grid;gap:8px;margin-bottom:22px}
form label>span{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--soft);letter-spacing:.08em}
input[type=text],input[type=email],textarea{border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:13px 14px;font-size:17px;font-family:inherit;outline:none;width:100%}
input:focus,textarea:focus{border-color:var(--accent)}
input[type=range]{width:100%;accent-color:var(--accent)}
.opt{font-size:14px;padding:9px 13px;border:1px solid var(--line-strong);color:var(--muted);background:transparent;cursor:pointer;font-family:inherit}
.opt.on{background:var(--accent);border-color:var(--accent);color:var(--btn-fg);font-weight:600}
.chk{font-size:16px;line-height:1.4;padding:13px 16px;border:1px solid var(--line-strong);color:var(--muted);background:transparent;cursor:pointer;text-align:left;font-family:inherit;width:100%}
.chk.on{border-color:var(--accent);background:var(--accent-soft);color:var(--ink)}
.bar-track{height:5px;background:var(--line)}
.bar-fill{height:100%;width:0;background:var(--accent);transition:width .25s ease}
footer.site{border-top:1px solid var(--line);background:var(--footer-bg)}
footer.site .cols{display:grid;grid-template-columns:minmax(0,1.4fr) repeat(2,minmax(0,1fr));gap:48px;padding:56px 0}
footer.site .cols a{display:block;font-size:16px;color:var(--muted);margin-bottom:10px}
footer.site .legal{border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:22px 0;font-size:14px;color:var(--soft)}
article.post{max-width:760px;margin:0 auto;padding:0 32px}
article.post .body{font-family:'Newsreader',Georgia,serif;font-size:20px;line-height:1.72;color:var(--prose)}
article.post .body h2{font-family:'Instrument Sans',sans-serif;font-size:27px;margin:44px 0 14px}
article.post blockquote{margin:36px 0;padding:24px 28px;border-left:2px solid var(--accent);background:var(--surface);font-size:21px;line-height:1.55;color:var(--ink)}
.meta{display:flex;gap:20px;flex-wrap:wrap;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--soft);letter-spacing:.06em}
.kcard{background:var(--bg);padding:30px 28px;display:flex;flex-direction:column;gap:12px;min-height:220px;color:var(--ink)}
.kcard:hover{background:var(--surface);color:var(--ink)}
.hide{display:none!important}
@media(max-width:1000px){.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}.rule-grid.c4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:900px){.split{grid-template-columns:1fr;gap:40px}.grid2,.grid3{grid-template-columns:1fr}.rule-grid.c3{grid-template-columns:1fr}section{padding:56px 0}.wrap{padding:0 22px}header.site .bar{height:auto;padding:14px 0;flex-wrap:wrap;gap:14px}}
@media(max-width:640px){.grid4{grid-template-columns:1fr}.rule-grid.c4{grid-template-columns:1fr}}