:root {
  --bg: #f6f4ee; --paper: #ffffff; --ink: #15202b; --muted: #5b6875; --line: #d9d5c8;
  --accent: #0b5cad; --accent-ink: #ffffff; --ok: #156f3d; --ok-bg: #e4f3ea; --bad: #a3231b; --bad-bg: #fbe9e6; --warn: #8a5300;
  --code-bg: #f0eee6; --radius: 6px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10161d; --paper: #18212b; --ink: #e6ebf0; --muted: #9aa7b4; --line: #2c3946;
    --accent: #6cb2ff; --accent-ink: #0b1622; --ok: #6fd39a; --ok-bg: #12301f; --bad: #ff9a8f; --bad-bg: #3a1a17; --warn: #f0b860;
    --code-bg: #111a23;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); }
a { color: var(--accent); text-underline-offset: 2px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.wrapper { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* header: a striped barrier line, the one decorative idea of the site */
.top { background: var(--paper); border-bottom: 1px solid var(--line); }
.top::before { content: ""; display: block; height: 6px; background: repeating-linear-gradient(135deg, var(--ink) 0 12px, #e7b416 12px 24px); }
.top .wrapper { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; padding-top: 12px; padding-bottom: 12px; }
.brand { font: 700 18px/1 var(--mono); color: var(--ink); text-decoration: none; letter-spacing: -0.02em; white-space: nowrap; }
.brand span { color: var(--accent); }
nav.main { display: flex; gap: 4px 16px; flex-wrap: wrap; flex: 1; font-size: 15px; }
nav.main a { color: var(--ink); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
nav.main a:hover, nav.main a[aria-current="page"] { border-bottom-color: var(--accent); }
.lang { font: 14px var(--mono); }

main { padding: 36px 0 56px; }
h1 { font-size: clamp(28px, 4.2vw, 42px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 14px; max-width: 22ch; }
h2 { font-size: 22px; line-height: 1.3; margin: 40px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 24px 0 6px; }
.lead { font-size: 19px; color: var(--muted); max-width: 62ch; margin: 0 0 26px; }
.prose { max-width: 70ch; }
.prose li { margin: 4px 0; }
code, pre, .code { font-family: var(--mono); font-size: 14px; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre.code { background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; overflow: auto; margin: 10px 0 0; white-space: pre-wrap; word-break: break-word; }
pre.code code { background: none; padding: 0; }

/* tool */
.tool { margin: 0 0 12px; }
.panel { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 0 0 14px; }
.panel h2 { margin-top: 0; }
.label { display: block; font: 600 13px/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); margin: 0 0 8px; }
textarea, input[type=text], input[type=number], select { font: 14px/1.5 var(--mono); color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 4px; padding: 7px 9px; }
textarea { width: 100%; resize: vertical; display: block; }
input[type=text] { width: 100%; min-width: 9em; }
#gate-name { max-width: 28em; font-family: var(--sans); font-size: 16px; }
button { font: 600 15px/1.2 var(--sans); cursor: pointer; border-radius: 4px; padding: 9px 16px; border: 1px solid var(--ink); background: var(--paper); color: var(--ink); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
button.ghost { border-color: var(--line); font-weight: 500; }
button.small { padding: 5px 10px; font-size: 14px; }
button.danger { color: var(--bad); border-color: var(--bad); }
button:hover { filter: brightness(0.94); }
button:disabled { opacity: 0.6; cursor: default; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
.row.spread { justify-content: space-between; }
.row.actions { margin: 4px 0 16px; }
.inline { font-size: 14px; color: var(--muted); }
.link { font-size: 15px; }
.two { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; }
.scroll { overflow-x: auto; }
table.grid { border-collapse: collapse; width: 100%; font-size: 14px; }
table.grid th { text-align: left; font: 600 12px var(--mono); text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); padding: 6px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.grid td { padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.grid td.center { text-align: center; }
table.grid td.num { font-family: var(--mono); color: var(--muted); }
.limits { display: flex; gap: 6px; flex-wrap: wrap; }
.limits input[type=text] { min-width: 14em; }

.result { border-left: 4px solid var(--line); border-radius: var(--radius); padding: 12px 16px; margin: 0 0 14px; background: var(--paper); }
.result.ok { border-left-color: var(--ok); background: var(--ok-bg); }
.result.bad { border-left-color: var(--bad); background: var(--bad-bg); }
.result .result { margin-top: 10px; }
.verdict { margin: 0 0 6px; }
.pill { display: inline-block; font: 600 13px var(--mono); padding: 2px 8px; border-radius: 999px; border: 1px solid currentColor; background: none; }
.pill.ok, .result.ok .verdict strong { color: var(--ok); }
.pill.bad, .result.bad .verdict strong, .error { color: var(--bad); }
.impact { color: var(--warn); font-weight: 600; }
.muted { color: var(--muted); font-size: 14px; }
del { color: var(--bad); text-decoration-thickness: 2px; font-family: var(--mono); font-size: 14px; }
ul.changes, ul.plain { list-style: none; padding: 0; margin: 8px 0; }
ul.changes li, ul.plain li { padding: 5px 0; border-bottom: 1px dashed var(--line); }
.tag { font: 600 12px var(--mono); padding: 1px 7px; border-radius: 999px; border: 1px solid currentColor; }
li.breaking .tag { color: var(--bad); } li.safe .tag { color: var(--ok); }
.kv { display: grid; grid-template-columns: minmax(120px, 190px) 1fr auto; gap: 10px; align-items: center; padding: 6px 0; border-bottom: 1px dashed var(--line); }
.kv .label { margin: 0; }
.wrap { word-break: break-all; }
details.exchange { border-top: 1px solid var(--line); padding: 8px 0; }
details.exchange summary { cursor: pointer; font-size: 14px; }
@media (max-width: 640px) { .kv { grid-template-columns: 1fr auto; } .kv .label { grid-column: 1 / -1; } }

/* content */
.steps { counter-reset: step; list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.steps li { counter-increment: step; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.steps li::before { content: counter(step, decimal-leading-zero); display: block; font: 700 13px var(--mono); color: var(--accent); margin-bottom: 4px; }
.cards { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.cards li { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.cards a { font-weight: 600; }
.flow { font: 14px/1.9 var(--mono); background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; overflow-x: auto; white-space: pre; }
dl.faq dt { font-weight: 600; margin-top: 16px; }
dl.faq dd { margin: 4px 0 0; max-width: 70ch; }
footer.site { border-top: 1px solid var(--line); background: var(--paper); padding: 22px 0 60px; font-size: 14px; color: var(--muted); }
footer.site .wrapper { display: flex; gap: 8px 22px; flex-wrap: wrap; }
footer.site a { color: var(--muted); }
.skip { position: absolute; left: -999px; top: 0; background: var(--paper); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; top: 8px; }