:root{color-scheme:only light;
 --ink:#16233B;--paper:#F7F5F0;--card:#FFFFFF;--amber:#E8A013;--green:#1E7A4E;
 --slate:#5B6572;--line:#D8D4CC;--code:#0F1A2E;}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;overflow-x:clip}
img{max-width:100%;height:auto}
body{font:16px/1.65 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);
 background:var(--paper);background-image:linear-gradient(var(--paper),var(--paper));}
h1,h2,h3,.brand{font-family:Archivo,Inter,system-ui,sans-serif;line-height:1.15;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,5.5vw,3rem);font-weight:800}
h2{font-size:clamp(1.35rem,3.6vw,1.7rem);font-weight:700;margin:2.2rem 0 .8rem}
h3{font-size:1.12rem;font-weight:700;margin:1.6rem 0 .5rem}
p{margin:.75rem 0}
a{color:var(--ink);text-decoration-color:var(--amber);text-decoration-thickness:2px;text-underline-offset:3px}
a:hover{color:var(--amber)}
a:focus-visible,button:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
code,pre,.mono{font-family:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace}
code{background:#ECE8E0;background-image:linear-gradient(#ECE8E0,#ECE8E0);padding:.1em .35em;border-radius:4px;font-size:.88em}
pre{background:var(--code);background-image:linear-gradient(var(--code),var(--code));color:#E8ECF4;
 padding:1rem 1.1rem;border-radius:10px;overflow-x:auto;font-size:.82rem;line-height:1.55;margin:1rem 0}
pre code{background:none;background-image:none;padding:0;color:inherit}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
/* header */
header{background:var(--ink);background-image:linear-gradient(var(--ink),var(--ink));color:#fff}
.hbar{display:flex;align-items:center;gap:14px;padding:14px 0;flex-wrap:wrap}
.brand{color:#fff;text-decoration:none;font-weight:800;font-size:1.25rem;display:flex;align-items:center;gap:10px}
.brand small{font-family:"IBM Plex Mono",monospace;font-weight:400;font-size:.68rem;color:#B8C0CE;letter-spacing:.08em}
.brand svg{flex:none}
nav{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
nav a{color:#DDE3EC;text-decoration:none;padding:.45rem .7rem;border-radius:8px;font-size:.92rem}
nav a:hover{background:#223252;background-image:linear-gradient(#223252,#223252);color:#fff}
nav a.on{background:#223252;background-image:linear-gradient(#223252,#223252);color:var(--amber)}
.vpill{font-family:"IBM Plex Mono",monospace;font-size:.7rem;color:var(--amber);border:1px solid #33456B;
 border-radius:99px;padding:.2rem .6rem}
/* hero */
.hero{background:var(--ink);background-image:linear-gradient(var(--ink),var(--ink));color:#fff;padding:2.6rem 0 3rem}
.hero p.lede{color:#C7CEDB;font-size:1.08rem;max-width:60ch;margin-top:1rem}
.hero-doc{background:#EDE9E1;background-image:linear-gradient(#EDE9E1,#EDE9E1);
 border-bottom:1px solid var(--line);padding:2rem 0 1.6rem}
.hero-doc .eyebrow{font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.12em;
 text-transform:uppercase;color:var(--slate);display:flex;gap:1rem;flex-wrap:wrap;margin-bottom:.6rem}
.hero-doc p.lede{color:#3C465A;max-width:64ch;font-size:1.02rem}
/* rail-line signature */
.rail{display:flex;align-items:center;gap:0;margin:1.8rem 0 0;max-width:560px}
.rail .seg{flex:1;height:4px;background:#33456B;background-image:linear-gradient(#33456B,#33456B)}
.rail .stn{flex:none;text-align:center;position:relative}
.rail .dot{width:16px;height:16px;border-radius:50%;border:4px solid var(--amber);
 background:var(--ink);background-image:linear-gradient(var(--ink),var(--ink));margin:0 auto}
.rail .dot.go{background:var(--amber);background-image:linear-gradient(var(--amber),var(--amber))}
.rail .lbl{position:absolute;top:22px;left:50%;transform:translateX(-50%);
 font-family:"IBM Plex Mono",monospace;font-size:.66rem;letter-spacing:.06em;color:#C7CEDB;white-space:nowrap}
.rail .stn:first-child .lbl{left:0;transform:none}
.rail .stn:last-child .lbl{left:auto;right:0;transform:none}
.rail.onlight .seg{background:var(--line);background-image:linear-gradient(var(--line),var(--line))}
.rail.onlight .dot{background:var(--paper);background-image:linear-gradient(var(--paper),var(--paper))}
.rail.onlight .dot.go{background:var(--amber);background-image:linear-gradient(var(--amber),var(--amber))}
.rail.onlight .lbl{color:var(--slate)}
.railpad{padding-bottom:2.2rem}
hr.rl{border:0;height:4px;max-width:120px;margin:2.4rem 0 0;background:var(--line);
 background-image:linear-gradient(var(--line),var(--line));position:relative;overflow:visible}
/* content */
main{padding:2.2rem 0 3rem}
.answer{background:var(--card);background-image:linear-gradient(var(--card),var(--card));
 border-left:5px solid var(--amber);border-radius:0 10px 10px 0;padding:1rem 1.2rem;margin:1.2rem 0;
 box-shadow:0 1px 3px rgba(22,35,59,.07)}
.answer b{font-family:Archivo,sans-serif}
table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.9rem;background:var(--card);
 background-image:linear-gradient(var(--card),var(--card));border-radius:10px;overflow:hidden}
th{background:var(--ink);background-image:linear-gradient(var(--ink),var(--ink));color:#fff;
 text-align:left;padding:.55rem .7rem;font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.06em}
td{padding:.55rem .7rem;border-top:1px solid #EEEAE2;vertical-align:top}
td code{white-space:nowrap}
.req{color:var(--green);font-weight:700;font-family:"IBM Plex Mono",monospace;font-size:.72rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:1.4rem 0}
.card{background:var(--card);background-image:linear-gradient(var(--card),var(--card));
 border:1px solid var(--line);border-radius:12px;padding:1.1rem 1.2rem}
.card h3{margin-top:0}
.card .mono{font-size:.72rem;color:var(--slate)}
.btn{display:inline-block;background:var(--amber);background-image:linear-gradient(var(--amber),var(--amber));
 color:var(--ink);font-weight:700;text-decoration:none;padding:.7rem 1.2rem;border-radius:10px;margin:.4rem .5rem .4rem 0}
.btn.ghost{background:transparent;background-image:linear-gradient(transparent,transparent);
 border:2px solid var(--amber);color:inherit}
.hero .btn.ghost{color:#fff}
.note{border:1px solid var(--line);border-left:5px solid var(--green);background:var(--card);
 background-image:linear-gradient(var(--card),var(--card));border-radius:0 10px 10px 0;padding:.9rem 1.1rem;margin:1.2rem 0;font-size:.95rem}
footer{background:var(--ink);background-image:linear-gradient(var(--ink),var(--ink));
 color:#B8C0CE;padding:2rem 0;font-size:.88rem;margin-top:2rem}
footer a{color:#DDE3EC}
.crumbs{font-size:.82rem;color:var(--slate);margin-bottom:.4rem}
.prose ul,.prose ol{margin:.6rem 0 .9rem 1.3rem}
.prose li{margin:.35rem 0}
blockquote{border-left:4px solid var(--amber);margin:1.2rem 0;padding:.4rem 0 .4rem 1rem;
 font-size:1.02rem;color:#2B3852}
@media (prefers-color-scheme: dark){
 :root{--ink:#16233B;--paper:#F7F5F0;--card:#FFFFFF;--amber:#E8A013;--green:#1E7A4E;--slate:#5B6572;--line:#D8D4CC;--code:#0F1A2E}
 body{background:var(--paper);background-image:linear-gradient(var(--paper),var(--paper));color:var(--ink)}
 header,.hero,footer{background:var(--ink);background-image:linear-gradient(var(--ink),var(--ink))}
 .hero-doc{background:#EDE9E1;background-image:linear-gradient(#EDE9E1,#EDE9E1)}}
@media (max-width:640px){
 .hbar{gap:8px}.brand small{display:none}
 table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
 pre{font-size:.76rem}
 nav{width:100%;margin-left:0}
 nav a{padding:.4rem .55rem;font-size:.86rem}
 .rail .lbl{font-size:.6rem}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}