/* envend site — one stylesheet, no framework.
   Palette, fonts and dark ground are the same ones /topology uses, so the
   documentation and the living diagram look like one thing. Geist for prose;
   Roboto Mono for values only — a path, a command, a number — never a label. */

:root{
  --bg:      oklch(0.165 0.021 264);
  --ink:     oklch(0.965 0.006 264);
  --ink2:    oklch(0.80 0.014 264);
  --muted:   oklch(0.635 0.02 264);
  --faint:   oklch(0.46 0.02 264);
  --line:    oklch(0.34 0.028 264);
  --panel:   oklch(0.205 0.025 264);
  --panel2:  oklch(0.195 0.023 264);
  --vending: oklch(0.80 0.135 78);
  --control: oklch(0.685 0.185 296);
  --data:    oklch(0.775 0.115 205);
  --trust:   oklch(0.775 0.145 158);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{margin:0}
body{
  background:
    radial-gradient(120% 90% at 50% -10%, oklch(0.235 0.05 296 / .5), transparent 60%),
    radial-gradient(90% 70% at 70% 120%, oklch(0.20 0.03 205 / .35), transparent 72%),
    var(--bg);
  background-attachment:fixed;
  color:var(--ink);
  font-family:"Geist",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  min-height:100vh;
}

.wrap{max-width:1160px;margin:0 auto;padding:0 clamp(18px,4vw,40px)}

/* ---------- header ---------- */
header.top{border-bottom:1px solid var(--line);background:oklch(0.165 0.021 264 / .72);backdrop-filter:blur(8px);position:sticky;top:0;z-index:5}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:58px;flex-wrap:wrap}
.wordmark{font-size:18px;font-weight:600;letter-spacing:-.02em;color:var(--ink);text-decoration:none;border-bottom:none}
.wordmark b{color:var(--control);font-weight:600}
header.top nav{display:flex;gap:18px;flex-wrap:wrap}
header.top nav a{font-size:14px;color:var(--ink2);text-decoration:none;border-bottom:none}
header.top nav a:hover,header.top nav a[aria-current]{color:var(--ink)}

/* ---------- prose ---------- */
main{padding:34px 0 12px}
h1{font-size:clamp(28px,4.4vw,42px);line-height:1.08;font-weight:600;letter-spacing:-.028em;margin:0 0 18px}
h1 b{font-weight:600;color:var(--control)}
h2{font-size:clamp(19px,2.4vw,23px);font-weight:600;letter-spacing:-.018em;margin:44px 0 12px;padding-top:14px;border-top:1px solid var(--line)}
h2:first-of-type{border-top:none;padding-top:0}
h3{font-size:16.5px;font-weight:600;letter-spacing:-.01em;margin:28px 0 8px;color:var(--ink)}
p{margin:0 0 14px;max-width:70ch;color:var(--ink2)}
p.lede{font-size:clamp(16.5px,2vw,19px);color:var(--ink);max-width:64ch;line-height:1.55}
strong{color:var(--ink);font-weight:600}
em{color:var(--ink);font-style:italic}
a{color:var(--data);text-decoration:none;border-bottom:1px solid oklch(0.775 0.115 205 / .32)}
a:hover{border-bottom-color:var(--data)}
ul,ol{margin:0 0 16px;padding-left:22px;max-width:70ch;color:var(--ink2)}
li{margin:0 0 7px}
li::marker{color:var(--faint)}
hr{border:none;border-top:1px solid var(--line);margin:34px 0}
.kicker{display:block;font-family:"Roboto Mono",ui-monospace,monospace;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}

/* ---------- data type: values only ---------- */
code,kbd,samp{font-family:"Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.87em}
:not(pre)>code{background:oklch(0.245 0.028 264);border:1px solid var(--line);border-radius:5px;padding:1px 5px;color:var(--ink);white-space:nowrap}
pre{background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:14px 16px;overflow-x:auto;margin:0 0 18px;line-height:1.55}
pre code{background:none;border:none;padding:0;font-size:13px;color:var(--ink2);white-space:pre}
pre code .c{color:var(--muted)}

/* ---------- tables ---------- */
.tablewrap{overflow-x:auto;max-width:100%;margin:0 0 20px;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:14px;min-width:520px}
th,td{text-align:left;padding:9px 14px;border-bottom:1px solid var(--line);vertical-align:top;color:var(--ink2)}
th{color:var(--ink);font-weight:600}
/* Uppercasing belongs to the heading row only. A row label is often a value —
   `sizes/0`, `GET /healthz` — and shouting it changes what it says. */
thead th{font-size:12.5px;letter-spacing:.03em;text-transform:uppercase;background:oklch(0.22 0.026 264)}
tbody th{font-size:14px;white-space:nowrap}
tr:last-child td{border-bottom:none}
td code{white-space:nowrap}
.yes{color:var(--trust);font-family:"Roboto Mono",monospace;font-size:12.5px}
.no{color:var(--vending);font-family:"Roboto Mono",monospace;font-size:12.5px}

/* ---------- definition rows (never a card grid) ---------- */
dl.rows{margin:0 0 22px;border-top:1px solid var(--line);max-width:78ch}
dl.rows>div{display:grid;grid-template-columns:190px 1fr;gap:4px 24px;padding:13px 0;border-bottom:1px solid var(--line)}
dl.rows dt{font-weight:600;color:var(--ink);font-size:15px}
dl.rows dd{margin:0;color:var(--ink2);font-size:14.5px;line-height:1.6}
dl.rows dd p{margin:0 0 8px;font-size:inherit}
dl.rows dd p:last-child{margin:0}
@media (max-width:720px){dl.rows>div{grid-template-columns:1fr;gap:2px}}

/* ---------- note ---------- */
.note{border-left:2px solid var(--control);background:oklch(0.22 0.03 296 / .35);padding:12px 16px;border-radius:0 10px 10px 0;margin:0 0 20px;max-width:74ch}
.note p:last-child{margin:0}
.note.warn{border-left-color:var(--vending);background:oklch(0.24 0.04 78 / .28)}

/* ---------- landing diagram: CSS, not SVG, so it reflows ---------- */
.diagram{border:1px solid var(--line);border-radius:16px;background:linear-gradient(180deg,oklch(0.20 0.025 264 / .6),oklch(0.172 0.022 264 / .6));padding:18px;margin:0 0 14px}
.parties{display:flex;gap:14px;align-items:stretch}
.party{flex:1 1 0;min-width:0;border:1px solid var(--line);border-radius:12px;padding:12px}
.party>h4{margin:0 0 3px;font-size:11px;letter-spacing:.16em;text-transform:uppercase;font-family:"Roboto Mono",monospace;color:var(--muted);font-weight:500}
.party>.sub{margin:0 0 12px;font-size:12.5px;color:var(--faint)}
.box{border:1px solid var(--faint);border-radius:9px;padding:9px 11px;margin:0 0 8px;background:var(--panel2)}
.box:last-child{margin-bottom:0}
.box.ours{border-color:var(--ink);background:oklch(0.235 0.028 264)}
.box.door{border-color:var(--data);background:oklch(0.775 0.115 205 / .07)}
.box .t{font-size:13.5px;font-weight:600;color:var(--ink);display:block}
.box .s{font-size:12px;color:var(--muted);display:block;margin-top:2px}
.tunnel{margin:12px 0 0;border:1px dashed var(--data);border-radius:9px;padding:8px 12px;text-align:center;font-size:12.5px;color:var(--data);font-family:"Roboto Mono",monospace}
.wires{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:11px 0 0}
.wires span{font-size:11.5px;color:var(--muted);font-family:"Roboto Mono",monospace}
@media (max-width:760px){.parties{flex-direction:column}.wires{display:none}}
.figcap{font-size:13px;color:var(--muted);margin:0 0 22px;max-width:70ch}

/* ---------- docs layout ---------- */
.docs{display:grid;grid-template-columns:210px minmax(0,1fr);gap:44px;align-items:start;padding:30px 0 12px}
.docs>main,.docs>.side{min-width:0}
.side{position:sticky;top:74px}
.side .grp{font-family:"Roboto Mono",monospace;font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:20px 0 7px}
.side .grp:first-child{margin-top:0}
.side a{display:block;font-size:14px;padding:3px 0;color:var(--ink2);border:none;line-height:1.45}
.side a:hover{color:var(--ink)}
.side a[aria-current]{color:var(--control);font-weight:600}
@media (max-width:900px){
  .docs{grid-template-columns:minmax(0,1fr);gap:22px;padding-top:20px}
  .side{position:static;border-bottom:1px solid var(--line);padding-bottom:14px}
  .side .grp{display:inline;margin:0 8px 0 0}
  .side nav{display:flex;flex-wrap:wrap;gap:4px 14px}
  .side a{padding:0}
}

/* ---------- footer ---------- */
footer.bot{border-top:1px solid var(--line);margin-top:52px;padding:22px 0 40px;font-size:13px;color:var(--muted)}
footer.bot .wrap{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;align-items:baseline}
footer.bot a{color:var(--muted);border-bottom-color:oklch(0.635 0.02 264 / .3)}
footer.bot a:hover{color:var(--ink2)}
footer.bot .mono{font-family:"Roboto Mono",monospace;font-size:12px}

/* A two-column reference table on a phone is a column of labels beside a
   column you cannot see, so those stack instead. The genuinely wide
   comparison tables — the capability matrix and the per-connector facts —
   are marked `wide` and keep scrolling sideways, because stacking a row of
   five yes/no answers loses the headings that give them meaning. */
@media (max-width:620px){
  .tablewrap:not(.wide) table{min-width:0}
  .tablewrap:not(.wide) thead{display:none}
  .tablewrap:not(.wide) tr{display:block;padding:11px 14px;border-bottom:1px solid var(--line)}
  .tablewrap:not(.wide) tr:last-child{border-bottom:none}
  .tablewrap:not(.wide) th,.tablewrap:not(.wide) td{display:block;border:none;padding:0;max-width:100%;overflow-x:auto}
  .tablewrap:not(.wide) th{background:none;color:var(--ink);font-size:14.5px;text-transform:none;letter-spacing:0;margin-bottom:4px}
  .tablewrap:not(.wide) td:first-child{color:var(--ink);font-weight:600;margin-bottom:4px}
  .tablewrap.wide::after{content:"";display:block}
}

/* A wide table's columns should not be squeezed into 130px on a phone: give
   it room and let the reader swipe, rather than eleven-line cells beside a
   blank first column. `.matrix` is the exception — yes/no answers are narrow
   enough to fit any screen without scrolling at all. */
.tablewrap.wide table{min-width:720px}
.tablewrap.matrix table{min-width:0}
.tablewrap.matrix td:not(:first-child),.tablewrap.matrix th:not(:first-child){text-align:center}