/* IVlWVlWI — ink on paper, and paper on ink.
   The marks are pure black-on-white JPEGs, so dark mode inverts the page and
   inverts them back. No webfonts: nothing is loaded from anywhere else. */

:root {
  --ink: #000;
  --paper: #fff;
  --mute: #666;
  --hair: #ddd;
  --invert: 0;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e8e8e8;
    --paper: #000;
    --mute: #8a8a8a;
    --hair: #333;
    --invert: 1;
  }
}

:root[data-theme="dark"] {
  --ink: #e8e8e8;
  --paper: #000;
  --mute: #8a8a8a;
  --hair: #333;
  --invert: 1;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  -webkit-font-smoothing: antialiased;
}

img.mark { filter: invert(var(--invert)); }

a { color: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.wrap { max-width: 900px; margin: 0 auto; padding: 0 20px; }
.rule { border: 0; border-top: 2px solid var(--ink); margin: 0; }

/* ── masthead ── */
.hero { width: 100%; height: auto; display: block; filter: invert(var(--invert)); }

.top {
  display: flex; align-items: baseline; justify-content: space-between;
  flex-wrap: wrap; gap: 10px 28px; padding: 18px 0;
}
.top .brand { letter-spacing: .34em; font-size: 15px; text-decoration: none; white-space: nowrap; }
.top nav { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13px; letter-spacing: .18em; }
.top nav a { text-decoration: none; padding-bottom: 2px; border-bottom: 2px solid transparent; }
.top nav a:hover { border-bottom-color: var(--hair); }
.top nav a[aria-current="page"] { border-bottom-color: var(--ink); }

/* ── sections and type ── */
section { padding: 42px 0; border-top: 2px solid var(--ink); }
section:first-of-type { border-top: 0; }

h1 { font-size: clamp(24px, 4.2vw, 40px); line-height: 1.15; margin: 0 0 14px; font-weight: 400; letter-spacing: -.01em; }
h2 { font-size: 13px; letter-spacing: .34em; font-weight: 400; margin: 0 0 22px; }
h3 { font-size: 13px; letter-spacing: .28em; font-weight: 400; margin: 34px 0 12px; }
h3:first-child { margin-top: 0; }

p { margin: 0 0 14px; max-width: 74ch; }
.lede { font-size: clamp(18px, 2.6vw, 22px); line-height: 1.4; max-width: 60ch; }
.motto { font-size: clamp(19px, 3.2vw, 30px); line-height: 1.28; margin: 0; max-width: 24ch; }
.mute { color: var(--mute); font-size: 14px; }
.mute a { color: var(--mute); }

ul, ol { margin: 0 0 14px; padding-left: 22px; max-width: 74ch; }
li { margin: 9px 0; }
li > b, li > strong { font-weight: 400; text-decoration: underline; text-underline-offset: 3px; }

/* ── grid of cells ── */
.grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2px; background: var(--ink); border: 2px solid var(--ink);
}
.cell { background: var(--paper); padding: 18px; }
.cell b { display: block; font-weight: 400; letter-spacing: .2em; margin-bottom: 9px; font-size: 13px; }

/* ── steps ── */
.steps { list-style: none; padding: 0; counter-reset: s; max-width: none; }
.steps > li {
  counter-increment: s; position: relative; padding: 0 0 0 46px; margin: 0 0 22px;
}
.steps > li::before {
  content: counter(s); position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; line-height: 28px; text-align: center;
  border: 2px solid var(--ink); font-size: 14px;
}
.steps b { display: block; font-weight: 400; letter-spacing: .12em; margin-bottom: 5px; }

/* ── tables ── */
.scroll { overflow-x: auto; margin: 0 0 14px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 10px 10px 10px 0; border-bottom: 1px solid var(--hair); font-weight: 400; vertical-align: top; }
th { letter-spacing: .2em; font-size: 12px; border-bottom: 2px solid var(--ink); white-space: nowrap; }

/* ── code ── */
pre {
  background: var(--ink); color: var(--paper); padding: 16px; overflow-x: auto;
  margin: 0 0 14px; font-size: 13.5px; line-height: 1.5;
}
pre b { font-weight: 400; text-decoration: underline; text-underline-offset: 3px; }
code { overflow-wrap: anywhere; }
p > code, li > code, td > code { border-bottom: 1px solid var(--hair); }

/* ── buttons and forms ── */
.btn {
  display: inline-block; padding: 12px 18px; border: 2px solid var(--ink);
  background: var(--ink); color: var(--paper); text-decoration: none;
  letter-spacing: .2em; font-size: 13px; text-align: center; line-height: 1.5;
  font-family: inherit; cursor: pointer; max-width: 100%;
}
.btn.ghost { background: transparent; color: var(--ink); }
.btn[disabled] { opacity: .4; cursor: not-allowed; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0 0; }

input[type="text"], input:not([type]), textarea {
  width: 100%; font: inherit; font-size: 15px; padding: 10px;
  border: 2px solid var(--ink); background: var(--paper); color: var(--ink);
}
label { display: block; font-size: 13px; letter-spacing: .18em; margin: 0 0 6px; }
.field { margin: 0 0 12px; }

/* ── callouts ── */
.note { border-left: 4px solid var(--ink); padding: 2px 0 2px 16px; margin: 0 0 16px; }
.note b { font-weight: 400; letter-spacing: .16em; display: block; margin-bottom: 4px; font-size: 13px; }

/* ── the barcode address ── */
.bars { font-size: 19px; letter-spacing: -.02em; user-select: all; word-break: break-all; display: block; }

/* ── gate ── */
#gate {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center; padding: 34px 20px;
}
#gate img { width: min(300px, 64vw); height: auto; margin: -26px 0 -20px; filter: invert(var(--invert)); }
#gate h1 { font-size: clamp(22px, 4vw, 34px); letter-spacing: .34em; margin: 8px 0; }
#gate p { max-width: 520px; margin: 8px auto; }
.keys {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(198px, 1fr));
  gap: 10px; margin: 24px auto 0; max-width: 660px; width: 100%;
}
.key { border: 2px solid var(--ink); padding: 10px 12px; text-align: left; font-size: 14px; }
.key b { display: block; font-weight: 400; letter-spacing: .14em; margin-bottom: 5px; font-size: 12.5px; }
kbd { border: 1px solid var(--ink); padding: 1px 5px; font: inherit; font-size: 13px; }

.test { width: 100%; max-width: 660px; margin: 26px auto 0; border: 2px solid var(--ink); text-align: left; }
.test-head { background: var(--ink); color: var(--paper); padding: 8px 12px; font-size: 12.5px; letter-spacing: .3em; }
#checks { list-style: none; margin: 0; padding: 6px 12px; font-size: 14px; max-width: none; }
#checks li { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-bottom: 1px solid var(--hair); margin: 0; }
#checks li:last-child { border-bottom: 0; }
#checks .v { letter-spacing: .18em; white-space: nowrap; font-size: 13px; }
#checks .v.fail { text-decoration: line-through; }
#checks .v.wait { color: var(--mute); }
.verdict { padding: 10px 12px; border-top: 2px solid var(--ink); letter-spacing: .24em; font-size: 13.5px; }
.verdict.ok { background: var(--ink); color: var(--paper); }
#status { margin-top: 10px; font-size: 13px; color: var(--mute); min-height: 1.4em; }

/* ── one-step payment (buy page) ── */
.paybox { display: flex; flex-wrap: wrap; gap: 20px; align-items: flex-start; border: 2px solid var(--ink); padding: 18px; margin: 0 0 14px; }
.paybox[hidden] { display: none; }
/* The QR keeps a white background and black modules in dark mode too: an
   inverted code scans badly in many wallets. */
.payqr { background: #fff; padding: 0; line-height: 0; flex: 0 0 auto; }
.payqr svg { display: block; max-width: 100%; height: auto; }
.paytext { flex: 1 1 260px; min-width: 0; }
.paytext b { display: block; font-weight: 400; letter-spacing: .2em; margin-bottom: 8px; }
.paytext .actions { margin-top: 12px; }

/* ── live clerk status (every page header) ── */
.livebar { font-size: 12px; letter-spacing: .16em; color: var(--mute); margin: 10px 0 0; width: 100%; }
.livebar .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--mute); margin-right: 8px; vertical-align: 1px; }
.livebar.ok .dot { background: var(--ink); }
.livebar.bad { color: var(--ink); }
.livebar.bad .dot { background: transparent; border: 1px solid var(--ink); }

.copy { margin-top: 10px; padding: 6px 12px; font-size: 12px; }

/* ── page reveal ── */
#page { display: none; }
#page.enter { animation: rise .55s ease-out; }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { #page.enter { animation: none; } }

/* ── footer ── */
footer { border-top: 2px solid var(--ink); padding: 26px 0 50px; font-size: 13px; color: var(--mute); }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 14px; letter-spacing: .16em; }
footer nav a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--hair); }

@media (max-width: 560px) {
  section { padding: 34px 0; }
  .steps > li { padding-left: 40px; }
  .bars { font-size: 16px; }
  .paybox { padding: 12px; }
  .payqr { flex-basis: 100%; }
  .payqr svg { margin: 0 auto; width: min(100%, 300px); }
}