/* Payzilla d10: one system for the site and for the buyer view, seller dashboard and operator console.
   Order: fonts, tokens, theme, base, type, header, band, state words, buttons, notice, page heads, then components,
   then responsive, motion, print. COMPONENTS.md says what each class is for.
   Every colour is a token (plain light values, then light-dark() pairs). The theme only sets color-scheme.
   Other products (dashboards) copy this file and only ADD rules in their own file; they never override these. */

/* ---------- Fonts (self-hosted, OFL) ----------
   IBM's own files, byte-identical (fonts/README.md): the Latin1 split of IBM Plex Sans Var (one variable file) and of IBM Plex Mono 400 and 500.
   unicode-range is IBM's own range for the Latin1 split; a character outside it falls back to the system font. */
@font-face{font-family:"Plex Sans";src:url(fonts/IBMPlexSansVar-Roman-Latin1.woff2) format("woff2");font-weight:100 700;font-style:normal;font-display:swap;unicode-range:U+0000,U+000D,U+0020-007E,U+00A0-00FF,U+0131,U+0152-0153,U+02C6,U+02DA,U+02DC,U+2013-2014,U+2018-201A,U+201C-201E,U+2020-2022,U+2026,U+2030,U+2039-203A,U+2044,U+20AC,U+2122,U+2212,U+FB01-FB02}
@font-face{font-family:"Plex Mono";src:url(fonts/IBMPlexMono-Regular-Latin1.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap;unicode-range:U+0020-007E,U+00A0-00FF,U+0131,U+0152-0153,U+02C6,U+02DA,U+02DC,U+2013-2014,U+2018-201A,U+201C-201E,U+2020-2022,U+2026,U+2030,U+2039-203A,U+2044,U+20AC,U+2122,U+2212,U+FB01-FB02}
@font-face{font-family:"Plex Mono";src:url(fonts/IBMPlexMono-Medium-Latin1.woff2) format("woff2");font-weight:500;font-style:normal;font-display:swap;unicode-range:U+0020-007E,U+00A0-00FF,U+0131,U+0152-0153,U+02C6,U+02DA,U+02DC,U+2013-2014,U+2018-201A,U+201C-201E,U+2020-2022,U+2026,U+2030,U+2039-203A,U+2044,U+20AC,U+2122,U+2212,U+FB01-FB02}

/* ---------- Tokens ----------
   Plain light values first (fallback for browsers without light-dark()); dark fallback needs JS (data-theme). */
:root{
  --sans:"Plex Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --wrap:1184px;--gut:24px;--gutter:64px;--r:6px;
  --bg:#FFFFFF;--bg-2:#F4F5F7;--bg-3:#E9ECF0;--soft:#EEF1FD;--ink:#0C1117;--ink-2:#39424E;--muted:#5A6472;--rule:#DADEE4;--rule-2:#0C1117;--accent:#1F45D6;--live:#0A6B43;--warn:#8A4B00;--fail:#A3261F;--plan:#39424E;--btn:#0C1117;--btn-ink:#FFFFFF;--btn-hover:#262E39;--notice:#FFF7EA
}
:root[data-theme="dark"]{--bg:#0B0E12;--bg-2:#12161C;--bg-3:#1A2029;--soft:#151B2E;--ink:#EEF1F4;--ink-2:#C2C9D2;--muted:#9AA4B1;--rule:#2A313B;--rule-2:#EEF1F4;--accent:#8AA6FF;--live:#52C891;--warn:#E5AE55;--fail:#FF8B80;--plan:#C2C9D2;--btn:#EEF1F4;--btn-ink:#0B0E12;--btn-hover:#C9D0D8;--notice:#1E1709}
/* Every current browser: one token table, light-dark(light, dark); the theme only sets color-scheme. */
@supports (color:light-dark(#000,#fff)){:root{
  --bg:light-dark(#FFFFFF,#0B0E12);
  --bg-2:light-dark(#F4F5F7,#12161C);
  --bg-3:light-dark(#E9ECF0,#1A2029);
  --soft:light-dark(#EEF1FD,#151B2E);
  --ink:light-dark(#0C1117,#EEF1F4);
  --ink-2:light-dark(#39424E,#C2C9D2);
  --muted:light-dark(#5A6472,#9AA4B1);
  --rule:light-dark(#DADEE4,#2A313B);
  --rule-2:light-dark(#0C1117,#EEF1F4);
  --accent:light-dark(#1F45D6,#8AA6FF);
  --live:light-dark(#0A6B43,#52C891);
  --warn:light-dark(#8A4B00,#E5AE55);
  --fail:light-dark(#A3261F,#FF8B80);
  --plan:light-dark(#39424E,#C2C9D2);
  --btn:light-dark(#0C1117,#EEF1F4);
  --btn-ink:light-dark(#FFFFFF,#0B0E12);
  --btn-hover:light-dark(#262E39,#C9D0D8);
  --notice:light-dark(#FFF7EA,#1E1709);
}}

/* ---------- Theme ----------
   1. No choice: follow the system (color-scheme: light dark).
   2. JS on: theme.js always sets data-theme (stored choice, else the system value).
   3. JS off: the header switch is a real checkbox; ticking it flips the system theme for this page. */
:root{color-scheme:light dark}
:root[data-theme="light"]{color-scheme:light}
:root[data-theme="dark"]{color-scheme:dark}
@media (prefers-color-scheme:dark){:root:not([data-theme]):has(#tt:checked){color-scheme:light}}
@media (prefers-color-scheme:light){:root:not([data-theme]):has(#tt:checked){color-scheme:dark}}
/* Things that must swap, not recolour (badge files, sun/moon): the same three conditions. */
.only-dark,.ic-sun{display:none}
:root[data-theme="dark"] :is(.only-dark,.ic-sun){display:block}
:root[data-theme="dark"] :is(.only-light,.ic-moon){display:none}
@media (prefers-color-scheme:dark){
  :root:not([data-theme]):not(:has(#tt:checked)) :is(.only-dark,.ic-sun){display:block}
  :root:not([data-theme]):not(:has(#tt:checked)) :is(.only-light,.ic-moon){display:none}
}
@media (prefers-color-scheme:light){
  :root:not([data-theme]):has(#tt:checked) :is(.only-dark,.ic-sun){display:block}
  :root:not([data-theme]):has(#tt:checked) :is(.only-light,.ic-moon){display:none}
}

/* ---------- Base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.55 var(--sans);overflow-wrap:break-word}
img,svg{display:block}
a{color:var(--accent);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
h1,h2,h3{margin:0;font-weight:600;letter-spacing:-0.015em;line-height:1.2;color:var(--ink)}
p,figure,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
[hidden]{display:none!important}
main:focus{outline:none}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}
.skip{position:absolute;left:16px;top:-60px;background:var(--btn);color:var(--btn-ink);padding:13px 16px;z-index:30}
.skip:focus{top:8px}
.wrap{max-width:calc(var(--wrap) + 2*var(--gut));margin:0 auto;padding:0 var(--gut)}
.mono{font-family:var(--mono)}

/* ---------- Type scale (one scale for every page) ---------- */
.eyebrow{font:500 13px/1.4 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.lead{font-size:19px;line-height:1.5;color:var(--ink-2);max-width:40em}
.small{font-size:14px;color:var(--muted);max-width:72ch}
.after{margin-top:22px}

/* ---------- Header ---------- */
.top{border-bottom:1px solid var(--rule);background:var(--bg)}
.bar{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:inline-flex;align-items:center;min-height:44px;flex:none}
.brand img{height:30px;width:auto}
.primary ul{display:flex;gap:2px}
.primary a{display:flex;align-items:center;min-height:44px;padding:0 10px;color:var(--ink-2);text-decoration:none;font-size:15px}
.primary a:hover{color:var(--ink);text-decoration:underline}
.primary a[aria-current="page"]{color:var(--ink);font-weight:600;box-shadow:inset 0 -2px 0 var(--ink)}
.bar-end{margin-left:auto;display:flex;align-items:center;gap:8px;position:relative}
.signin{display:inline-flex;align-items:center;min-height:44px;padding:0 10px;color:var(--ink-2);font-size:15px;text-decoration:underline;text-underline-offset:3px}
.signin:hover{color:var(--ink);text-decoration-thickness:2px}

/* Control: the one bordered 44 px control (theme switch, menu, stepper) */
.ctl,.iconbtn,.m-menu summary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-width:44px;min-height:44px;padding:0 13px;border:1px solid var(--muted);border-radius:var(--r);background:transparent;color:var(--ink);font:500 14px var(--sans);cursor:pointer}
.ctl:hover,.iconbtn:hover,.m-menu summary:hover{border-color:var(--ink)}
.ctl[aria-disabled="true"]{opacity:.45;cursor:default}
.iconbtn{padding:0;width:44px}
.iconbtn svg,.m-menu summary svg{width:20px;height:20px}
.tt-in:focus-visible+.iconbtn{outline:2px solid var(--accent);outline-offset:3px}

/* Small-screen menu: <details>, works without JS */
.m-menu{display:none;position:relative}
.m-menu summary{list-style:none}
.m-menu summary::-webkit-details-marker{display:none}
.m-menu[open] summary{background:var(--bg-2)}
.m-panel{position:absolute;right:0;top:52px;width:min(320px,calc(100vw - 32px));background:var(--bg);border:1px solid var(--rule-2);padding:8px 0;z-index:20}
.m-panel ul+ul{border-top:1px solid var(--rule);margin-top:8px;padding-top:8px}
.m-panel a{display:flex;align-items:center;min-height:44px;padding:0 18px;color:var(--ink);text-decoration:none}
.m-panel a:hover{background:var(--bg-2)}
.m-panel a[aria-current="page"]{font-weight:600;box-shadow:inset 3px 0 0 var(--ink)}

/* ---------- State band (every page, under the header) ---------- */
.band{border-bottom:1px solid var(--rule);background:var(--bg-2);font-size:14px}
.band .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:0 20px;min-height:44px}
.band .st{font:500 14px var(--sans);white-space:normal}
.band a{display:inline-flex;align-items:center;min-height:44px;color:var(--ink-2)}
.band a:hover{color:var(--ink)}
.band a.st-live{color:var(--live);text-decoration:underline;text-underline-offset:3px}
.band .when{margin-left:auto;color:var(--muted);font:13px var(--mono)}

/* ---------- State word plus shape (never colour alone) ---------- */
.st{display:inline-flex;align-items:center;gap:8px;font:500 13px var(--mono);letter-spacing:.01em;white-space:nowrap}
.st svg{width:13px;height:13px;flex:none}
.st-live,.st-part{color:var(--live)}
.st-built,.st-dev{color:var(--ink-2)}
.st-plan,.st-sub{color:var(--plan)}
.st-res{color:var(--muted)}
.st-no,.st-rev{color:var(--warn)}
.st-fail{color:var(--fail)}
.st-ink{color:var(--ink)}
.legend{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:13px}
.legend .st{font-size:13px}
.tag{font:500 13px var(--mono);letter-spacing:.06em;text-transform:uppercase;border:1px solid var(--rule);padding:1px 6px;border-radius:3px;color:var(--muted)}
.badge-sample{font:500 13px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--warn);background:var(--bg);border:1px solid currentColor;padding:2px 7px;border-radius:3px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 22px;background:var(--btn);color:var(--btn-ink);text-decoration:none;font:600 16px/1.2 var(--sans);border-radius:var(--r);border:1px solid var(--btn)}
.btn:hover{background:var(--btn-hover);border-color:var(--btn-hover);text-decoration:none}
.btn .arr{width:14px;height:14px;flex:none}
.btn-2{background:transparent;color:var(--ink);border-color:var(--rule-2)}
.btn-2:hover{background:var(--bg-2);border-color:var(--rule-2)}
.btn.inert{cursor:default;opacity:.7}
.btn.inert:hover{background:var(--btn);border-color:var(--btn)}
.btn-row{display:flex;flex-wrap:wrap;gap:13px}
.links{display:flex;flex-wrap:wrap;gap:4px 22px;font-size:15px}
.links a{display:inline-flex;align-items:center;min-height:44px}

/* ---------- Notice (real money; later: errors, stale data) and the Terms pointer ---------- */
.notice{border-left:3px solid var(--warn);background:var(--notice);padding:13px 14px;font-size:15px;color:var(--ink);max-width:72ch}
.notice strong{font-weight:600}
.notice a{color:inherit}
.notice-fail{border-left-color:var(--fail)}
.legal-line{font-size:14px;color:var(--ink-2);margin-top:12px}
/* Links in running text get a 44 px tall hit area; vertical padding on an inline link does not move the text. */
main a:not([class]):not(:is(.links,.proof-links,.sec-head .aside,.reg th) a){padding-block:12px}

/* ---------- Page heads ---------- */
.hero{padding:48px 0 36px}
.home{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);grid-template-areas:"t f" "d d";gap:40px 64px;align-items:start}
.home .h-t{grid-area:t}.home .h-f{grid-area:f}.home .h-d{grid-area:d}
.hero h1{font-size:56px;line-height:1.06;letter-spacing:-0.025em;max-width:12em}
.hero .lead{margin-top:20px}
.phead{padding:44px 0 40px}
.phead h1{font-size:44px;line-height:1.1;letter-spacing:-0.025em;margin-top:13px}
.phead .lead{margin-top:16px}
.phead .btn-row{margin-top:26px}
.phead .note{margin-top:14px}
.note{font-size:14px;color:var(--ink-2);max-width:72ch}
.note .st{margin-right:8px;vertical-align:-1px}

/* ---------- Facts: label and value rows (dl) ---------- */
.facts{border-top:2px solid var(--rule-2)}
.facts>div{display:grid;grid-template-columns:7.5em minmax(0,1fr);gap:13px;padding:13px 0;border-bottom:1px solid var(--rule);font-size:15px}
.facts dt{color:var(--muted);font:500 13px var(--mono);letter-spacing:.05em;text-transform:uppercase;padding-top:3px}
.facts dd{color:var(--ink);min-width:0}
.facts dd small{display:block;color:var(--muted);font-size:13px}
.facts .amt{font:500 16px var(--mono)}
.facts .mono{font-size:14px;overflow-wrap:anywhere}
.facts-cap{padding:0 0 10px}

/* ---------- Doors: Pay and Sell, equal ---------- */
.doors{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--rule-2)}
.door{padding:24px 32px 26px;display:flex;flex-direction:column;gap:14px}
.door+.door{border-left:1px solid var(--rule-2)}
.door h2{font-size:22px}
.door p{color:var(--ink-2);font-size:15.5px}
.doors>.notice{grid-column:1/-1;margin:24px 32px 0}
.doors>.legal-line{grid-column:1/-1;margin:0;padding:12px 32px;border-top:1px solid var(--rule)}
.door .btn{align-self:flex-start;margin-top:auto}
.door .door-foot{font-size:13.5px;color:var(--muted)}

/* ---------- Numbered section ---------- */
.sec{padding:52px 0;border-top:1px solid var(--rule)}
.sec-head{display:grid;grid-template-columns:var(--gutter) minmax(0,1fr) auto;gap:6px 0;align-items:baseline;margin-bottom:28px}
.sec-head .n{font:13px var(--mono);color:var(--muted)}
.sec-head h2{font-size:30px}
.sec-head .aside{font-size:14px;text-align:right}
.sec-head .aside a{display:inline-flex;align-items:center;min-height:44px}
.sec-head .sub{grid-column:2/4;color:var(--ink-2);max-width:44em}
/* The body indents to the number column only when the section shows a number. */
.sec-head:has(.n:not(:empty))+.sec-body{margin-left:var(--gutter)}
.sec-head:has(.n:empty){grid-template-columns:minmax(0,1fr) auto}
.sec-head .n:empty{display:none}
.sec-head:has(.n:empty) .sub{grid-column:1/-1}
.sub-h{font-size:18px;margin:32px 0 13px}

/* ---------- Pair: words left, panel right ---------- */
.pair{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:56px;align-items:start}
.pair-hero{grid-template-columns:minmax(0,6fr) minmax(0,5.2fr);align-items:center}
.pair .words p+p{margin-top:13px}
.pair .words p{color:var(--ink-2)}

/* ---------- Cells: one row of short facts or steps, ruled ---------- */
.cells{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:2px solid var(--rule-2)}
.cells.c2{grid-template-columns:repeat(2,minmax(0,1fr))}
.cells.c3{grid-template-columns:repeat(3,minmax(0,1fr))}
.cells.c3>:nth-child(3n+1){padding-left:0;border-left:0}
.cells .st{margin-top:8px}
.cells p+p{margin-top:8px}
.cells .btn-row,.cells .notice,.cells .links,.cells details{margin-top:14px}
.cells h2{font-size:20px;margin-bottom:6px}
.cells.c5{grid-template-columns:repeat(5,minmax(0,1fr))}
.cells.keyfacts dt{font:500 34px/1.1 var(--mono);letter-spacing:-0.02em;text-transform:none;color:var(--ink);margin-bottom:6px}
.cells>*{padding:16px 20px 18px 0;border-bottom:1px solid var(--rule)}
.cells>*+*{padding-left:20px;border-left:1px solid var(--rule)}
.cells.c2>:nth-child(odd){padding-left:0;border-left:0}
.cells h3{font-size:16px;margin-bottom:4px}
.cells p,.cells dd{color:var(--ink-2);font-size:15.5px}
.cells dt{color:var(--muted);font:500 13px var(--mono);letter-spacing:.05em;text-transform:uppercase;margin-bottom:6px}
.cells .n{display:block;font:13px var(--mono);color:var(--muted);margin-bottom:6px}
.cells li{color:var(--ink-2);font-size:15.5px}
.cells li b{display:block;color:var(--ink);font-weight:600;margin-bottom:2px}

/* ---------- Register: a table of parts and states; stacked rows on phones ---------- */
.reg{width:100%;border-collapse:collapse;border-top:2px solid var(--rule-2)}
.reg th,.reg td{text-align:left;vertical-align:top;padding:10px 16px 10px 0;border-bottom:1px solid var(--rule);font-size:15.5px}
.reg thead th{font:500 13px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.reg tbody th{font-weight:600;width:28%}
.reg td.s{width:16%;padding-top:13px}
.reg td.nt{color:var(--ink-2)}
.reg tbody th a{color:var(--ink);display:inline-block;min-width:44px;padding:13px 0;margin:-13px 0}
.reg code{font:14px var(--mono);overflow-wrap:anywhere}
.reg thead .st{white-space:normal}

/* ---------- Figures (numbers with their date line above) ---------- */
.dateline{color:var(--ink-2);max-width:72ch;margin-bottom:18px}
.figs{display:grid;grid-template-columns:repeat(3,1fr);border-top:2px solid var(--rule-2)}
.fig{padding:18px 20px 18px 0;border-bottom:1px solid var(--rule)}
.fig+.fig{padding-left:20px;border-left:1px solid var(--rule)}
.fig b{display:flex;align-items:center;gap:10px;font:500 40px/1.1 var(--mono);letter-spacing:-0.02em}
.fig b svg{width:14px;height:14px}
.fig span{display:block;margin-top:6px;color:var(--ink-2);font-size:15px}
.fig-live svg{color:var(--live)} .fig-fail svg{color:var(--fail)} .fig-skip svg{color:var(--muted)}
.proof-links{margin-top:8px;display:flex;flex-wrap:wrap;gap:0 28px;font-size:15px}
.proof-links a{display:inline-flex;align-items:center;min-height:44px;gap:10px}

/* ---------- Panel: head, body, foot. Sample panels are dashed and striped. ---------- */
.panel{border:1px solid var(--rule);background:var(--bg)}
.panel-h{display:flex;justify-content:space-between;align-items:center;gap:13px;padding:13px 16px;border-bottom:1px solid var(--rule);background:var(--bg-2)}
.panel-h b{font-weight:600;font-size:15px}
.panel-b{padding:4px 16px 13px}
.panel-b .facts{border-top:0}
.panel-b .facts>div:last-child{border-bottom:0}
.panel-b .facts>div{grid-template-columns:9.5em minmax(0,1fr)}
.panel-f{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 14px;padding:10px 16px;border-top:1px solid var(--rule);background:var(--bg-2);font:13px/1.5 var(--mono);color:var(--muted)}
.sample{border:1px dashed var(--muted)}
.sample .panel-h{background:repeating-linear-gradient(-45deg,var(--bg-2) 0 10px,var(--bg-3) 10px 20px);border-bottom:1px dashed var(--muted)}
.sample .panel-f{border-top:1px dashed var(--muted)}
.tick{display:flex;align-items:flex-start;gap:10px;padding:8px 0;font-size:15px}
.tick .box{width:18px;height:18px;flex:none;margin-top:2px;border:1.5px solid var(--ink-2);border-radius:3px;display:grid;place-items:center;color:var(--bg)}
.tick .box.on{background:var(--ink-2)}
.tick .box svg{width:14px;height:14px}
.tick small{display:block;color:var(--muted);font-size:13.5px}
/* Code keeps its lines: long lines scroll sideways inside the panel instead of wrapping mid-statement.
   A soft shadow at an edge shows that more code is hidden there (it moves with the scroll). */
.code{--cb:var(--bg-2);--cs:color-mix(in srgb,var(--ink) 22%,transparent);margin:0;padding:16px;font:13.5px/1.75 var(--mono);color:var(--ink);white-space:pre;overflow-x:auto;
  background:linear-gradient(to right,var(--cb) 30%,transparent) left/32px 100% no-repeat local,
    linear-gradient(to left,var(--cb) 30%,transparent) right/32px 100% no-repeat local,
    linear-gradient(to right,var(--cs),transparent) left/12px 100% no-repeat scroll,
    linear-gradient(to left,var(--cs),transparent) right/12px 100% no-repeat scroll,var(--cb)}
.code .c{color:var(--muted)}
.code.out{--cb:var(--bg);color:var(--ink-2);border-left:3px solid var(--rule)}
.sample table{width:100%;border-collapse:collapse;font-size:14px}
.sample th,.sample td{text-align:left;padding:9px 13px 9px 0;border-bottom:1px solid var(--rule);white-space:nowrap}
.sample thead th{font:500 13px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.scroll{overflow-x:auto}
.scroll-hint{display:none}
/* Index of the sections of a long page */
.toc{margin-top:16px;border-top:1px solid var(--rule)}
.toc ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:24px}
.toc a{display:flex;align-items:center;min-height:44px;border-bottom:1px solid var(--rule)}

/* ---------- Sequence: three lifelines, one row per message, a stepper ---------- */
.seq{border:1px solid var(--rule)}
.lanes,.srow{display:grid;grid-template-columns:56px repeat(3,minmax(0,1fr))}
.lanes{border-bottom:1px solid var(--rule);background:var(--bg-2)}
.lanes span{padding:10px 13px;font:500 13px var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted);text-align:center}
.seq-rows{--lw:56px;background:
  linear-gradient(var(--rule),var(--rule)) no-repeat calc(var(--lw) + (100% - var(--lw))/6) 0/1px 100%,
  linear-gradient(var(--rule),var(--rule)) no-repeat calc(var(--lw) + (100% - var(--lw))/2) 0/1px 100%,
  linear-gradient(var(--rule),var(--rule)) no-repeat calc(var(--lw) + (100% - var(--lw))*5/6) 0/1px 100%}
.srow{position:relative;border-bottom:1px solid var(--rule)}
.srow:last-child{border-bottom:0}
.srow .n{font:500 13px var(--mono);color:var(--muted);padding:13px 0 0 16px}
.arrow{grid-row:1;position:relative;padding:10px 10px 13px;min-height:72px}
.arrow::before{content:"";position:absolute;left:25%;right:25%;top:36px;border-top:1.5px solid var(--ink-2)}
.arrow .hd{position:absolute;top:31px;width:0;height:0;border-top:5px solid transparent;border-bottom:5px solid transparent}
.arrow .hd.r{right:calc(25% - 1px);border-left:8px solid var(--ink-2)}
.arrow .hd.l{left:calc(25% - 1px);border-right:8px solid var(--ink-2)}
.arrow .lbl,.arrow .sub{display:block;width:fit-content;margin:0 auto;padding:0 6px;background:var(--bg);text-align:center;position:relative}
.arrow .lbl{font:500 13px/1.3 var(--mono);color:var(--ink)}
.arrow .sub{margin-top:13px;font-size:13px;color:var(--ink-2)}
.arrow.self::before{display:none}
.arrow.self .lbl{border:1.5px solid var(--accent);border-radius:3px;padding:3px 8px;margin-top:6px}
.arrow.self .sub{margin-top:8px}
.c-bs{grid-column:2/4}.c-sp{grid-column:3/5}.c-p{grid-column:4/5}
.srow.is-on{background:var(--soft)}
.srow.is-on::after{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent)}
.srow.is-on .arrow .lbl,.srow.is-on .arrow .sub{background:var(--soft)}
.srow.is-on .arrow::before{border-top:2px solid var(--accent)}
.srow.is-on .hd.r{border-left-color:var(--accent)}
.srow.is-on .hd.l{border-right-color:var(--accent)}
.sdetail{padding:6px 16px;border-top:1px solid var(--rule)}
.sdetail li{display:grid;grid-template-columns:160px minmax(0,1fr);gap:4px 16px;padding:10px 0;border-top:1px solid var(--rule);font-size:15px;color:var(--ink-2)}
.sdetail li:first-child{border-top:0}
.sdetail b{color:var(--ink);font-weight:600}
.sdetail .who{display:block;font:500 13px var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-top:2px}
.js .sdetail li:not(.is-on){display:none}
.seq .panel-f{align-items:center;font:13.5px var(--sans);color:var(--ink-2)}
.stepper{display:none;align-items:center;gap:6px}
.js .stepper{display:flex}
.stepper svg{width:18px;height:18px}
.stepper .pos{font:500 13px var(--mono);color:var(--muted);min-width:76px;text-align:center}

/* ---------- Prose: long text (legal pages, guides), 44em measure ---------- */
.prose{max-width:70ch}
.prose h2{font-size:24px;margin:40px 0 12px}
.prose h3{font-size:18px;margin:28px 0 8px}
.prose>:first-child{margin-top:0}
.prose p,.prose ul,.prose ol,.prose .panel,.prose .reg,.prose .notice{margin:0 0 14px}
.prose .panel .code{margin:0}
.prose p,.prose li{color:var(--ink-2)}
.prose ul{list-style:square;padding-left:1.3em}
.prose ol{list-style:decimal;padding-left:1.5em}
.prose li+li{margin-top:6px}
.prose strong{color:var(--ink);font-weight:600}
.prose code{font:14px var(--mono);overflow-wrap:anywhere}
.prose.wide-code{max-width:none}
/* Legal documents (Terms, Privacy): their markup is kept byte for byte, so the few live classes are styled here. */
.doc-wrap{padding:44px var(--gut) 64px}
.doc h1{font-size:44px;line-height:1.1;letter-spacing:-0.025em;margin:0 0 20px}
.doc .pill{border-left:3px solid var(--warn);background:var(--notice);padding:13px 14px;color:var(--ink)}

/* ---------- Disclosure: more detail, closed by default, works without JS ---------- */
.disc{border-top:1px solid var(--rule)}
.disc:last-child{border-bottom:1px solid var(--rule)}
.disc>summary{list-style:none;display:flex;align-items:center;gap:12px;min-height:48px;padding:8px 0;cursor:pointer;font-weight:600}
.disc>summary::-webkit-details-marker{display:none}
.disc>summary::before{content:"";flex:none;width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(-45deg);margin:0 4px}
.disc[open]>summary::before{transform:rotate(45deg)}
.disc>div{padding:4px 0 20px}

/* ---------- Panels side by side (samples) and check lines ---------- */
.panels{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;align-items:start}
.checks li{display:grid;grid-template-columns:6.5em minmax(0,1fr);gap:12px;padding:10px 0;border-bottom:1px solid var(--rule);font-size:15px;color:var(--ink-2)}
.panel-b .chain{border-top:0;padding-top:12px}

/* ---------- Status chain and definitions ---------- */
.chain{display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;padding:18px 0;border-top:2px solid var(--rule-2);border-bottom:1px solid var(--rule)}
.chain ol,.chain ul{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.chain li{display:inline-flex;align-items:center;gap:10px}
.chain .st{font-size:14px;padding:8px 13px;border:1px solid var(--rule);border-radius:4px;color:var(--ink)}
.chain .st svg{color:var(--ink-2)}
.chain .fin svg{color:var(--live)}
.chain .to{width:14px;height:14px;color:var(--muted)}
.chain .off{margin-left:auto;display:flex;gap:10px}
.chain .bad svg{color:var(--fail)}
.chain .rev svg{color:var(--warn)}
.defs>div{display:grid;grid-template-columns:12em minmax(0,1fr);gap:13px;padding:13px 0;border-bottom:1px solid var(--rule);font-size:15.5px}
.defs dt{font-weight:600}
.defs dd{color:var(--ink-2);max-width:72ch}

/* ---------- Closing band (inner pages): notice, then both doors, equal ---------- */
.close{padding:32px 0 40px;border-top:1px solid var(--rule);background:var(--bg-2)}
.close-grid{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px 40px;align-items:center}
.close h2{font-size:24px}
.close p{color:var(--ink-2);font-size:15px;margin-top:8px;max-width:44em}
.close .notice{margin-top:14px;max-width:44em;background:var(--bg)}
.close .legal-line{grid-column:1/-1;margin-top:0}

/* ---------- Footer ---------- */
.foot{border-top:2px solid var(--rule-2);padding:36px 0 24px;font-size:14.5px;background:var(--bg)}
.f-grid{display:grid;grid-template-columns:minmax(0,2.4fr) minmax(0,3fr) minmax(0,2.3fr) minmax(0,2.1fr) minmax(0,1.2fr);gap:28px}
.f-two ul{display:grid;grid-auto-flow:column;column-gap:16px}
.r4 ul{grid-template-rows:repeat(4,auto)}
.r3 ul{grid-template-rows:repeat(3,auto)}
.f-brand p{color:var(--ink-2);margin-top:13px;max-width:26em}
.foot h2{font:500 13px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.foot ul a{display:inline-flex;align-items:center;min-height:44px;min-width:44px;color:var(--ink);text-decoration:none}
.foot ul a:hover{text-decoration:underline}
.logos{display:flex;flex-wrap:wrap;align-items:center;gap:16px 28px;margin:24px 0 14px;padding-top:18px;border-top:1px solid var(--rule)}
.logos .aws{height:36px;width:auto}
.sol-wrap{background:#000;padding:8px 10px;border-radius:4px}
/* The AWS badge file is drawn for light backgrounds; in dark mode it sits on a white plate. */
.aws-wrap{background:light-dark(transparent,#fff);padding:4px 6px;border-radius:4px}
.logos .sol{height:14px;width:auto}
.logos .usdc{height:24px;width:auto}
.legal{color:var(--muted);font-size:13.5px;max-width:60em}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .primary,.signin{display:none}
  .m-menu{display:block}
}
@media (max-width:920px){
  .home{grid-template-columns:1fr;grid-template-areas:"t" "d" "f";row-gap:24px}
  .pair,.pair-hero{grid-template-columns:minmax(0,1fr);gap:32px}
  .cells,.cells.c3{grid-template-columns:1fr 1fr}
  .cells.c5{grid-template-columns:1fr}
  .cells.c5>*{padding:13px 0 14px;border-left:0}
  .cells>:nth-child(odd),.cells.c3>:nth-child(odd){padding-left:0;border-left:0}
  .cells.c3>:nth-child(even){padding-left:20px;border-left:1px solid var(--rule)}
  .f-grid{grid-template-columns:1fr 1fr}
  .f-brand{grid-column:1/3}
  .f-grid nav ul{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);column-gap:16px}
  .close-grid{grid-template-columns:minmax(0,1fr)}
  .panels{grid-template-columns:minmax(0,1fr)}
  .band .when{display:none}
}
@media (max-width:720px){
  :root{--gut:16px}
  .hero{padding:32px 0 28px}
  .hero h1{font-size:36px;line-height:1.1}
  .phead{padding:30px 0 28px}
  .phead h1,.doc h1{font-size:32px}
  .doc-wrap{padding:30px var(--gut) 48px}
  .lead{font-size:17.5px}
  .band .when{display:none}
  .doors{grid-template-columns:1fr}
  .door{padding:20px}
  .doors>.notice{margin:20px 20px 0}
  .doors>.legal-line{padding:12px 20px}
  .door+.door{border-left:0;border-top:1px solid var(--rule-2)}
  .sec{padding:40px 0}
  .sec-head{grid-template-columns:1fr;margin-bottom:20px}
  .sec-head h2{font-size:25px}
  .sec-head .aside{text-align:left}
  .sec-head .sub{grid-column:1}
  .sec-head:has(.n:not(:empty))+.sec-body{margin-left:0}
  .toc ol{grid-template-columns:minmax(0,1fr)}
  /* Count matrix: one block per row, each count with its label */
  .reg.matrix thead{display:none}
  .reg.matrix,.reg.matrix tbody,.reg.matrix tr{display:block}
  .reg.matrix tbody tr{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:16px;padding:10px 0;border-bottom:1px solid var(--rule)}
  .reg.matrix th,.reg.matrix td{display:flex;justify-content:space-between;border:0;padding:4px 0}
  .reg.matrix th{grid-column:1/-1;display:block;width:auto}
  .reg.matrix td::before{content:attr(data-label);color:var(--ink-2);font-family:var(--sans)}
  .cells,.cells.c2,.cells.c3{grid-template-columns:1fr}
  .scroll-hint{display:block;margin-bottom:8px}
  .cells.keyfacts dt{font-size:26px}
  .close{padding:28px 0 32px}
  .cells>*,.cells>*+*,.cells.c3>:nth-child(n){padding:13px 0 14px;border-left:0}
  .facts>div{grid-template-columns:7em minmax(0,1fr);gap:10px}
  .panel-b .facts>div{grid-template-columns:8.5em minmax(0,1fr);gap:10px}
  .h-f .facts{display:grid;grid-template-columns:1fr 1fr;column-gap:16px}
  .h-f .facts>div{grid-template-columns:1fr;gap:0;padding:8px 0}
  .h-f .facts>div:first-child,.h-f .facts>div:last-child{grid-column:1/3}
  .reg:not(.keep):not(.matrix) thead{display:none}
  .reg:not(.keep):not(.matrix),.reg:not(.keep):not(.matrix) tbody,.reg:not(.keep):not(.matrix) tr,.reg:not(.keep):not(.matrix) th,.reg:not(.keep):not(.matrix) td{display:block;width:auto}
  .reg:not(.keep):not(.matrix) tbody tr{display:grid;grid-template-columns:minmax(6em,1fr) minmax(0,auto);column-gap:13px;border-bottom:1px solid var(--rule);padding:10px 0}
  .reg:not(.keep):not(.matrix) td.s .st{white-space:normal}
  .reg:not(.keep):not(.matrix) th,.reg:not(.keep):not(.matrix) td{border:0;padding:0}
  .reg:not(.keep):not(.matrix) tbody th{width:auto;font-size:16px;grid-column:1}
  .reg:not(.keep):not(.matrix) td.s{width:auto;grid-column:2;grid-row:1;padding:2px 0 0}
  .reg:not(.keep):not(.matrix) td.nt{grid-column:1/3;margin-top:2px;font-size:15px}
  .reg.st-first:not(.keep) td.s{grid-column:1;grid-row:auto;padding:0 0 4px}
  .fig{padding:13px 8px 13px 0}
  .fig+.fig{padding-left:10px}
  .fig b{font-size:26px;gap:6px}
  .fig b svg{width:10px;height:10px}
  .figs.stack{grid-template-columns:1fr}
  .figs.stack .fig,.figs.stack .fig+.fig{padding:12px 0;border-left:0}
  .fig span{font-size:13.5px;line-height:1.35}
  .proof-links{display:grid}
  .lanes,.srow{grid-template-columns:32px repeat(3,minmax(0,1fr))}
  .seq-rows{--lw:32px}
  .lanes span{font-size:13px;padding:8px 2px;letter-spacing:.02em}
  .srow .n{padding-left:10px}
  .arrow{min-height:56px}
  .arrow .lbl{font-size:13px}
  .arrow .sub{display:none}
  .sdetail li{grid-template-columns:minmax(0,1fr)}
  .chain .off{margin-left:0}
  .defs>div{grid-template-columns:1fr;gap:2px}
  .f-grid{grid-template-columns:minmax(0,1fr);gap:20px}
  .f-brand{grid-column:auto}
  /* Phone footer: two equal columns, filled row by row so both columns share row heights; a long item spans the row. */
  .f-grid nav ul{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-template-rows:none;grid-auto-flow:row;column-gap:16px}
  .f-grid nav li.wide{grid-column:1/-1}
  .foot ul a{display:flex;min-height:44px;padding:6px 0;line-height:1.3}
  .band .wrap{flex-wrap:nowrap;gap:0 8px}
  .band .rp{display:none}
  .band .st{font-size:13px;white-space:nowrap}
  .band .st{gap:5px}
  .band .st svg{width:11px;height:11px}
}
@media (max-width:480px){
  .lanes{display:none}
  .seq-rows{background:none}
  .srow{grid-template-columns:32px minmax(0,1fr)}
  .srow .arrow{grid-column:2;min-height:0;padding:10px 12px 10px 0}
  .arrow::before,.arrow .hd{display:none}
  .arrow .lbl,.arrow .sub,.arrow.self .lbl{display:block;margin:0;padding:0;background:none;text-align:left;border:0;width:auto}
  .arrow .lbl{font-size:13.5px}
  .arrow .sub,.arrow.self .sub{display:block;margin-top:2px;font-size:13px}
  .srow.is-on .arrow .lbl,.srow.is-on .arrow .sub{background:none}
}
@media (max-width:419px){
  .band .wrap{flex-wrap:wrap}
  .sample th,.sample td{padding-right:8px;font-size:13px}
}
@media (max-width:360px){
  .bar{gap:8px}
  .brand img{height:26px}
  .stepper .pos{min-width:56px}
}

/* ---------- Motion: one purposeful change (the active step), off when asked ---------- */
.srow,.srow .arrow::before{transition:background-color .2s ease,border-color .2s ease}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}
@media print{
  :root,:root[data-theme]{color-scheme:light}
  .top,.band,.foot,.doors,.close,.stepper{display:none}
}
/* Windows high contrast: keep the active step and ticked boxes visible */
@media (forced-colors:active){
  .srow.is-on{outline:3px solid Highlight;outline-offset:-3px}
  .tick .box.on{forced-color-adjust:none;background:CanvasText;color:Canvas}
  .btn.inert{opacity:1;border-style:dashed}
}