/* BitrateCraft — engineering documentation theme (hand-written, no frameworks) */
:root{
  --bg:#F5F5F2; --panel:#FFFFFF; --ink:#202422; --muted:#5C6360;
  --rule:#D7D8D2; --rust:#C2410C; --olive:#3F6212; --code:#EFEEE7; --maxw:1080px;
  --head:"Tahoma","Verdana","Geneva",sans-serif;
  --body:"Calibri","Segoe UI","Helvetica Neue",Arial,sans-serif;
  --mono:"Consolas","DejaVu Sans Mono","Courier New",monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--body)}
a{color:#8A2B08;text-decoration:none;border-bottom:1px solid rgba(194,65,12,.35)}
a:hover{border-bottom-color:var(--rust)}
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:50}
.skip:focus{left:8px;top:8px}

/* ---------- masthead + barcode nav ---------- */
.masthead{position:sticky;top:0;z-index:40;background:var(--panel);border-bottom:1px solid var(--rule);box-shadow:0 1px 0 rgba(0,0,0,.02)}
.bar{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:1rem;padding:.7rem 1rem}
.brand{display:flex;align-items:center;gap:.6rem;font:700 1.06rem/1 var(--head);letter-spacing:.06em;text-transform:uppercase;color:var(--ink);border:0}
.brand:hover{border:0}
.brand-bars{display:inline-block;width:30px;height:22px;border-radius:3px;
  background:repeating-linear-gradient(90deg,var(--ink) 0 2px,transparent 2px 5px,var(--ink) 5px 6px,transparent 6px 9px,var(--ink) 9px 13px,transparent 13px 15px)}
.brand small{display:block;font:400 .58rem/1.2 var(--mono);letter-spacing:.22em;color:var(--muted);text-transform:uppercase}
.burger{margin-left:auto;display:none;align-items:center;gap:.45rem;font:700 .72rem/1 var(--head);letter-spacing:.14em;text-transform:uppercase;
  background:var(--ink);color:#fff;border:0;border-radius:4px;padding:.6rem .8rem;cursor:pointer}
.burger .bg{display:inline-block;width:16px;height:12px;
  background:repeating-linear-gradient(90deg,#fff 0 1px,transparent 1px 3px);}
.nav{max-width:var(--maxw);margin:0 auto;display:flex;gap:.25rem;padding:0 1rem .55rem;overflow:visible}
.nav-group{position:relative;flex:1 1 auto}
.nav-group>summary{list-style:none;cursor:pointer;display:flex;flex-direction:column;gap:.35rem;align-items:flex-start;
  padding:.55rem .6rem .5rem;border:1px solid var(--rule);border-radius:5px;background:#FBFBF8}
.nav-group>summary::-webkit-details-marker{display:none}
.nav-group>summary:hover{border-color:var(--muted)}
.bc{display:block;width:100%;height:16px;opacity:.72;
  background:repeating-linear-gradient(90deg,var(--ink) 0 1px,transparent 1px 3px,var(--ink) 3px 4px,transparent 4px 7px)}
.bc-label{font:700 .66rem/1 var(--head);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.nav-group.is-current>summary{background:var(--ink);border-color:var(--ink)}
.nav-group.is-current .bc{background:repeating-linear-gradient(90deg,var(--rust) 0 1px,transparent 1px 3px,var(--rust) 3px 4px,transparent 4px 7px);opacity:1}
.nav-group.is-current .bc-label{color:#fff}
.nav-panel{position:absolute;top:calc(100% + 4px);left:0;min-width:250px;background:var(--panel);border:1px solid var(--rule);
  border-radius:6px;box-shadow:0 14px 30px rgba(20,25,22,.16);padding:.5rem;z-index:45}
.nav-panel a{display:block;padding:.5rem .6rem;border:0;border-radius:4px;color:var(--ink);font-size:.95rem}
.nav-panel a:hover{background:var(--code)}
.nav-panel a[aria-current="page"]{background:var(--code);box-shadow:inset 3px 0 0 var(--rust);font-weight:700}
.nav-panel .np-note{display:block;font:400 .68rem/1.4 var(--mono);color:var(--muted);letter-spacing:.06em;padding:.2rem .6rem .4rem}
.nav-extra{display:flex;gap:1rem;align-items:center;margin-left:auto;padding:0 0 0 .13rem}
.nav-extra a{font:700 .7rem/1 var(--head);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);border:0}
.nav-extra a:hover{color:var(--rust)}

@media (max-width:760px){
  .burger{display:inline-flex}
  .nav{display:none;flex-direction:column;gap:.4rem;padding:.4rem .8rem .9rem}
  .nav.open{display:flex}
  .nav-group{flex:none}
  .nav-panel{position:static;box-shadow:none;border:0;border-left:3px solid var(--rust);border-radius:0;margin:.2rem 0 .3rem .2rem}
  .nav-extra{padding:.3rem .2rem 0;flex-wrap:wrap;margin-left:0}
}

/* ---------- shell ---------- */
main{max-width:var(--maxw);margin:0 auto;padding:1.2rem 1rem 2.4rem}
.doc{background:var(--panel);border:1px solid var(--rule);border-radius:8px;padding:1.6rem 1.6rem 2rem}
.crumb{font:400 .72rem/1.4 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 .5rem}
h1{font:700 1.62rem/1.22 var(--head);letter-spacing:.01em;margin:.1rem 0 .7rem}
h2{font:700 1.14rem/1.3 var(--head);margin:1.9rem 0 .7rem;padding-bottom:.35rem;border-bottom:2px solid var(--rule)}
h3{font:700 1rem/1.3 var(--head);margin:1.3rem 0 .45rem}
p,li{color:#2C3230}
.lead{font-size:1.06rem;color:#39403D}
ul,ol{padding-left:1.25rem}
li{margin:.3rem 0}
code,kbd,pre{font-family:var(--mono)}
code{background:var(--code);padding:.08rem .35rem;border-radius:3px;font-size:.9em}
pre{background:#1E2421;color:#E8EBE6;padding:.85rem 1rem;border-radius:6px;overflow:auto;font-size:.86rem;line-height:1.5}
kbd{background:var(--panel);border:1px solid var(--muted);border-bottom-width:2px;border-radius:4px;padding:.05rem .4rem;font-size:.82rem}
blockquote{margin:1rem 0;padding:.2rem 0 .2rem 1rem;border-left:3px solid var(--olive);color:#3B4540}

.disc-banner{background:#FFF4EC;border:1px solid #F0C9AE;border-left:4px solid var(--rust);border-radius:6px;padding:.7rem .9rem;margin:0 0 1.2rem;
  font-size:.88rem;color:#5A2D12}
.disc-banner strong{letter-spacing:.02em}

.grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin:1rem 0}
.card{background:#FBFBF8;border:1px solid var(--rule);border-radius:7px;padding:.9rem 1rem}
.card h3{margin:.1rem 0 .35rem;font-size:.98rem}
.card p{margin:.2rem 0 0;font-size:.92rem}
.tile-icon{display:block;width:34px;height:34px;margin:0 0 .5rem}
.fig{margin:1.2rem 0;border:1px solid var(--rule);border-radius:7px;overflow:hidden;background:#FBFBF8}
.fig img{display:block;width:100%;height:auto}
.fig figcaption{padding:.55rem .8rem;font:400 .8rem/1.45 var(--mono);color:var(--muted)}
.pair{display:grid;gap:1rem;grid-template-columns:1fr 1fr;margin:1rem 0}
@media (max-width:700px){.pair{grid-template-columns:1fr}}
table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.92rem}
th,td{border:1px solid var(--rule);padding:.5rem .6rem;text-align:left;vertical-align:top}
thead th{background:var(--ink);color:#fff;font:700 .78rem/1.3 var(--head);letter-spacing:.05em;text-transform:uppercase}
tbody tr:nth-child(even){background:#FAFAF7}
.dt{margin:.6rem 0}
.note{background:#F2F4EF;border:1px solid #CFD6C8;border-radius:6px;padding:.7rem .9rem;font-size:.92rem}
.steps{counter-reset:s;list-style:none;padding-left:0}
.steps>li{counter-increment:s;position:relative;padding-left:2.5rem;margin:.6rem 0}
.steps>li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:.05rem;
  font:700 .78rem/1.6 var(--mono);color:#fff;background:var(--rust);border-radius:4px;padding:.1rem .4rem}
.faq{margin:1rem 0}
.faq details{border:1px solid var(--rule);border-radius:6px;background:#FBFBF8;margin:.5rem 0}
.faq summary{cursor:pointer;padding:.7rem .9rem;font:700 .95rem/1.35 var(--head)}
.faq details[open] summary{border-bottom:1px solid var(--rule)}
.faq .faq-body{padding:.7rem .9rem .9rem}
form{max-width:640px}
.field{margin:.85rem 0}
.field label{display:block;font:700 .78rem/1.4 var(--head);letter-spacing:.06em;text-transform:uppercase;margin-bottom:.3rem}
.field input,.field select,.field textarea{width:100%;padding:.6rem .7rem;border:1px solid var(--muted);border-radius:5px;background:#fff;font:inherit;color:inherit}
.field textarea{min-height:140px;resize:vertical}
.btn{display:inline-block;margin-top:.4rem;background:var(--rust);color:#fff;border:0;border-radius:5px;padding:.75rem 1.4rem;
  font:700 .82rem/1 var(--head);letter-spacing:.1em;text-transform:uppercase;cursor:pointer}
.btn:hover{background:#9E340A}
.pager{display:flex;justify-content:space-between;gap:1rem;margin-top:2rem;border-top:1px solid var(--rule);padding-top:1rem;font-size:.9rem}

/* ---------- footer ---------- */
footer{background:var(--ink);color:#D8DCD8;margin-top:1rem}
.foot-wrap{max-width:var(--maxw);margin:0 auto;padding:2rem 1rem 1.2rem}
.foot-cols{display:grid;gap:1.4rem;grid-template-columns:1.5fr 1fr 1fr 1fr}
@media (max-width:760px){.foot-cols{grid-template-columns:1fr 1fr}}
.foot-cols h4{font:700 .72rem/1.3 var(--head);letter-spacing:.16em;text-transform:uppercase;color:#fff;margin:0 0 .6rem}
.foot-cols a{color:#D8DCD8;border:0;display:block;padding:.18rem 0;font-size:.9rem}
.foot-cols a:hover{color:#F0B58F}
.foot-brand{display:flex;align-items:center;gap:.55rem;font:700 1rem/1 var(--head);letter-spacing:.05em;text-transform:uppercase;color:#fff;margin-bottom:.6rem}
.foot-brand .brand-bars{width:26px;height:19px;background:repeating-linear-gradient(90deg,#F5F5F2 0 2px,transparent 2px 5px,#F5F5F2 5px 6px,transparent 6px 9px,#F5F5F2 9px 13px,transparent 13px 15px)}
.addr{font-style:normal;font-size:.9rem;line-height:1.6;color:#B9BFBA}
.addr a{color:#E9EEE9}
.foot-disc{margin-top:1.6rem;border-top:1px solid #3A423E;padding-top:1rem;font-size:.86rem;color:#AEB5B0}
.legal{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;margin:.8rem 0 0;padding:0;list-style:none}
.legal a{color:#D8DCD8;font-size:.86rem;border:0}
.copyright{margin-top:1rem;font-size:.8rem;color:#8E958F}