:root{--bg:#08101f;--bg2:#0c1728;--panel:rgba(126,164,224,.06);--border:rgba(150,180,220,.14);--ink:#eef3f8;--soft:#a3b3c6;--faint:#66768f;--lime:#86cc42;--lime2:#a9e35f;--code:#0a1424;--font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--disp:"Space Grotesk","Inter",-apple-system,"Segoe UI",sans-serif;--mono:ui-monospace,"SF Mono","Cascadia Code",Consolas,monospace}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:4.5rem}
body{background:linear-gradient(180deg,#0a1424,#08101f 40%,#070d1a);background-attachment:fixed;color:var(--ink);font:16px/1.65 var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--lime2);text-decoration:none}a:hover{text-decoration:underline}
::selection{background:var(--lime);color:#0a1420}
.top{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:1.2rem;padding:.7rem 1.25rem;background:rgba(8,16,31,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:.5rem;font:600 1.1rem var(--disp);color:var(--ink)}.brand span{color:var(--faint);font-weight:500;font-size:.9rem}.brand:hover{text-decoration:none}
.topnav{display:flex;gap:1rem;flex:1;overflow-x:auto;white-space:nowrap}.topnav a{color:var(--soft);font-size:.92rem}.topnav a:hover{color:var(--ink);text-decoration:none}
.search{position:relative}.search input{background:var(--panel);border:1px solid var(--border);color:var(--ink);border-radius:8px;padding:.45rem .7rem;width:200px;font:inherit;font-size:.9rem}
.search input:focus{outline:2px solid var(--lime);border-color:transparent}
#results{position:absolute;right:0;top:110%;width:min(420px,90vw);max-height:60vh;overflow:auto;background:var(--bg2);border:1px solid var(--border);border-radius:10px;list-style:none;box-shadow:0 12px 40px rgba(0,0,0,.5)}
#results li a{display:block;padding:.6rem .8rem;color:var(--ink);border-bottom:1px solid var(--border)}#results li a small{display:block;color:var(--faint)}#results li a:hover,#results li a.sel{background:var(--panel);text-decoration:none}
.burger{display:none;background:none;border:1px solid var(--border);color:var(--ink);border-radius:8px;padding:.3rem .6rem;font-size:1.1rem}
.layout{display:grid;grid-template-columns:270px minmax(0,1fr) 220px;max-width:1440px;margin:0 auto}
.side{position:sticky;top:57px;align-self:start;height:calc(100vh - 57px);overflow:auto;padding:1.2rem 1rem 3rem 1.25rem;border-right:1px solid var(--border);font-size:.9rem}
.side details{margin-bottom:.35rem}.side summary{cursor:pointer;padding:.35rem .4rem;font-weight:600;color:var(--ink);border-radius:6px;display:flex;justify-content:space-between;align-items:center;list-style:none}
.side summary::-webkit-details-marker{display:none}.side summary:hover{background:var(--panel)}
.side ul{list-style:none;margin:.15rem 0 .5rem .5rem;border-left:1px solid var(--border)}.side li a{display:block;padding:.28rem .7rem;color:var(--soft)}.side li a:hover{color:var(--ink);text-decoration:none}
.side li a.cur{color:var(--lime2);font-weight:600;border-left:2px solid var(--lime);margin-left:-1px}
.mode{font:600 .62rem var(--font);letter-spacing:.06em;text-transform:uppercase;padding:.12rem .45rem;border-radius:99px;border:1px solid}
.m-learn{color:#9db7ff;border-color:#9db7ff55}.m-build{color:var(--lime2);border-color:#86cc4255}.m-operate{color:#ffc46b;border-color:#ffc46b55}
main{min-width:0;padding:2rem clamp(1.25rem,4vw,3.25rem) 4rem}
article{max-width:800px}
.crumb{color:var(--faint);font-size:.85rem;margin-bottom:.8rem;display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}
h1,h2,h3,h4{font-family:var(--disp);line-height:1.18;letter-spacing:-.015em}
h1{font-size:clamp(1.9rem,4vw,2.6rem);font-weight:700;margin-bottom:.6rem}
.lead{color:var(--soft);font-size:1.12rem;margin-bottom:1.6rem}
article h2{font-size:1.5rem;margin:2.4rem 0 .8rem;padding-top:.4rem;border-top:1px solid var(--border)}article h3{font-size:1.15rem;margin:1.6rem 0 .5rem}
article p,article ul,article ol{margin-bottom:1rem}article ul,article ol{padding-left:1.4rem}article li{margin:.25rem 0}
article strong{color:#fff}
code{font:.87em var(--mono);background:rgba(126,164,224,.12);padding:.1em .38em;border-radius:5px}
pre{background:var(--code);border:1px solid var(--border);border-radius:10px;padding:1rem 1.1rem;overflow-x:auto;margin:0 0 1.2rem;font:.85rem/1.55 var(--mono);color:#dbe7f5}pre code{background:none;padding:0;font-size:inherit}
pre code.language-diagram,.diagram{color:var(--lime2)}
blockquote{border-left:3px solid var(--lime);background:var(--panel);padding:.8rem 1.1rem;margin:0 0 1.2rem;border-radius:0 8px 8px 0;color:var(--soft)}blockquote p{margin:0}
table{border-collapse:collapse;width:100%;margin:0 0 1.3rem;font-size:.92rem;display:block;overflow-x:auto}
th,td{text-align:left;padding:.55rem .8rem;border-bottom:1px solid var(--border);vertical-align:top}th{color:var(--soft);font-weight:600;background:var(--panel);white-space:nowrap}
.rail{position:sticky;top:57px;align-self:start;max-height:calc(100vh - 57px);overflow:auto;padding:2rem 1rem 2rem .5rem;font-size:.82rem}
.toc h4{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--faint);margin-bottom:.6rem}.toc ul{list-style:none;border-left:1px solid var(--border)}.toc ul ul{margin-left:.7rem}.toc a{display:block;padding:.2rem .7rem;color:var(--soft)}.toc a:hover{color:var(--ink);text-decoration:none}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:3rem}.pn a{display:block;border:1px solid var(--border);border-radius:10px;padding:.8rem 1rem;background:var(--panel);color:var(--ink)}.pn a:hover{border-color:var(--lime);text-decoration:none}.pn small{display:block;color:var(--faint);font-size:.74rem;text-transform:uppercase;letter-spacing:.06em}.pn .next{text-align:right}
.foot{margin-top:3rem;padding-top:1.2rem;border-top:1px solid var(--border);color:var(--faint);font-size:.85rem}
.btn{display:inline-block;padding:.6rem 1.05rem;border:1px solid var(--border);border-radius:10px;color:var(--ink);font-weight:500;margin:0 .3rem .5rem 0}.btn:hover{border-color:var(--lime);text-decoration:none}.btn.primary{background:var(--lime);color:#0a1420;border-color:var(--lime);font-weight:600}
/* home */
.homepage{max-width:1100px;margin:0 auto;padding:3rem clamp(1.25rem,5vw,2.75rem) 4rem}
.hero{text-align:center;padding:2rem 0 1rem}.eyebrow{color:var(--lime);font-weight:600;letter-spacing:.08em;text-transform:uppercase;font-size:.8rem;margin-bottom:.8rem}
.hero h1{font-size:clamp(2.2rem,6vw,3.6rem)}.lime{color:var(--lime)}.hero .lead{max-width:680px;margin:1rem auto 1.6rem}
.flow{display:flex;flex-direction:column;align-items:center;gap:.15rem;margin:1.6rem 0}.flow span{border:1px solid var(--border);background:var(--panel);border-radius:10px;padding:.45rem 1.1rem;min-width:240px}.flow i{color:var(--lime);font-style:normal}
.promise{color:var(--faint);font-size:.95rem;margin-top:1rem}
.story{margin:3rem 0}.story h2{font-size:1.6rem;margin-bottom:1rem;text-align:center}.story pre{max-width:560px;margin:0 auto}
.modes{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem;margin:2rem 0}.mode-card{border:1px solid var(--border);background:var(--panel);border-radius:14px;padding:1.2rem 1.3rem}.mode-card ul{list-style:none;margin-top:.6rem}.mode-card li{padding:.15rem 0}
.allsections h2{margin-bottom:1rem}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.8rem}.card{display:flex;flex-direction:column;border:1px solid var(--border);border-radius:12px;padding:.9rem 1rem;background:var(--panel);color:var(--ink)}.card:hover{border-color:var(--lime);text-decoration:none}.card span{color:var(--faint);font-size:.82rem}
@media(max-width:1100px){.layout{grid-template-columns:250px minmax(0,1fr)}.rail{display:none}}
@media(max-width:760px){.burger{display:block}.topnav{display:none}.search input{width:120px}.layout{display:block}.side{display:none;position:fixed;inset:57px 0 0 0;height:auto;background:var(--bg);z-index:40;border:0}.side.open{display:block}}

figure{margin:0 0 1.5rem;text-align:center}
figure a{display:block;border:1px solid var(--border);border-radius:12px;overflow:hidden;background:#0a1424}
figure a:hover{border-color:var(--lime);text-decoration:none}
figure img{display:block;max-width:100%;height:auto;margin:0 auto}
figcaption{color:var(--faint);font-size:.82rem;margin-top:.45rem}
.story figure{max-width:760px;margin:0 auto}