/* ZPair — paper, ink, cobalt, signal lime. Space Grotesk + Space Mono. Square corners, hard rules, a grid you can feel. */
:root {
  --paper: #f3f1ec; --paper2: #e7e4dc; --card: #ffffff; --ink: #0e0e10; --ink2: #34343b; --muted: #74727b;
  --line: rgba(14, 14, 16, 0.14); --line2: rgba(14, 14, 16, 0.3); --grid: rgba(14, 14, 16, 0.055);
  --cobalt: #2340ff; --cobalt-soft: #bfc8ff; --lime: #d4ff3a; --green: #12b76a; --red: #e5484d;
  --sans: "Space Grotesk", system-ui, -apple-system, sans-serif; --mono: "Space Mono", ui-monospace, Menlo, monospace;
  color-scheme: light;
}
[hidden] { display: none !important; }
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.55 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: clip; }
a { color: var(--cobalt); }
code, .mono { font-family: var(--mono); font-size: .9em; }
.muted { color: var(--muted); }
.fine { margin: 0; font-size: 13px; color: var(--muted); }
.skip { position: absolute; left: -999px; top: 8px; z-index: 50; background: var(--ink); color: #fff; padding: 8px 12px; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--cobalt); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } .pipe .pp { display: none; } }

/* ---------------------------------------------------------------- buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 18px; border: 2px solid var(--ink); background: var(--card); color: var(--ink); font: 700 15px/1 var(--sans); cursor: pointer; text-decoration: none; white-space: nowrap; transition: transform .12s, box-shadow .12s, background .15s; }
.btn:hover { box-shadow: 3px 3px 0 var(--ink); transform: translate(-1px, -1px); }
.btn:active { box-shadow: none; transform: none; }
.btn[disabled] { opacity: .45; cursor: not-allowed; box-shadow: none; transform: none; }
.btn.solid { background: var(--ink); color: #fff; }
.btn.solid:hover { box-shadow: 3px 3px 0 var(--cobalt); }
.btn.danger { border-color: var(--red); color: var(--red); }
.btn.ghost { border-color: var(--line2); }
.btn.small { min-height: 36px; padding: 0 12px; font-size: 13.5px; }

/* ---------------------------------------------------------------- header */
.top { position: sticky; top: 0; z-index: 30; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 8px 20px; padding: 10px clamp(14px, 3vw, 32px); background: rgba(243, 241, 236, .9); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 2px solid var(--ink); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.logo { width: 34px; height: 34px; }
.logo .l1 { fill: var(--card); stroke: var(--ink); stroke-width: 2.4; }
.logo .l2 { fill: var(--lime); stroke: var(--ink); stroke-width: 2.4; }
.logo .l3 { stroke: var(--cobalt); stroke-width: 3; }
.word { font: 700 21px/1 var(--sans); letter-spacing: -.03em; }
.nav { display: flex; gap: 2px; justify-content: center; overflow-x: auto; scrollbar-width: none; min-width: 0; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--ink); text-decoration: none; font: 700 12.5px var(--mono); text-transform: uppercase; letter-spacing: .04em; padding: 7px 10px; white-space: nowrap; }
.nav a:hover, .nav a.on { background: var(--ink); color: #fff; }
.ca { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 6px 10px; border: 2px solid var(--ink); background: var(--lime); min-width: 0; }
.ca code, .foot-ca code { overflow-wrap: anywhere; word-break: break-all; min-width: 0; flex: 1 1 200px; }
.ca-k { font: 700 12px var(--mono); }

/* ---------------------------------------------------------------- hero */
.hero { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(20px, 3vw, 44px); padding: clamp(22px, 3.2vw, 44px) clamp(14px, 3vw, 32px) 34px; min-height: calc(100svh - 62px); border-bottom: 2px solid var(--ink); overflow: clip; }
.hero-left { display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.tag { margin: 0; display: flex; align-items: center; gap: 10px; font: 700 12.5px var(--mono); text-transform: uppercase; letter-spacing: .05em; }
.tag .sq { width: 10px; height: 10px; background: var(--cobalt); }
.h1 { margin: 0; font: 700 clamp(38px, 4.6vw, 68px)/.98 var(--sans); letter-spacing: -.045em; }
.h1 .hl { background: var(--lime); padding: 0 .08em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.h2 { margin: 0; font: 700 22px/1.15 var(--sans); letter-spacing: -.02em; }
.card { position: relative; background: var(--card); border: 2px solid var(--ink); box-shadow: 8px 8px 0 var(--ink); padding: 20px; min-width: 0; }
.card:focus { outline: none; }
.st { display: flex; flex-direction: column; gap: 14px; }
.big-msg { margin: 0; display: flex; gap: 12px; align-items: center; font: 600 17px var(--sans); }
.spin { width: 18px; height: 18px; border: 3px solid var(--paper2); border-top-color: var(--cobalt); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.qr-wrap { display: grid; grid-template-columns: minmax(0, 230px) minmax(0, 1fr); gap: 20px; align-items: start; }
.qr { aspect-ratio: 1; border: 2px solid var(--ink); background: #fff; display: grid; place-items: center; position: relative; }
.qr svg { width: 100%; height: 100%; display: block; }
.qr.used::after { content: "Scanned"; position: absolute; inset: 0; display: grid; place-items: center; background: rgba(255, 255, 255, .88); font: 700 18px var(--mono); }
.qr-side { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.step-k { margin: 0; font: 700 12px var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--cobalt); }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.row.end { justify-content: flex-end; }
.sas { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; }
.sas span { display: grid; place-items: center; aspect-ratio: 1; font-size: clamp(30px, 4vw, 44px); border: 2px solid var(--ink); background: var(--paper); }
.sas-names { margin: 0; font-size: 13px; color: var(--ink2); }
.live-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ok-dot { width: 10px; height: 10px; background: var(--green); border-radius: 50%; box-shadow: 0 0 0 4px rgba(18, 183, 106, .18); }
.sas-mini { font-size: 16px; letter-spacing: 2px; }
.spacer { flex: 1; }
.tabs { display: flex; border: 2px solid var(--ink); }
.tab { flex: 1; min-height: 40px; border: 0; border-right: 2px solid var(--ink); background: var(--card); font: 700 13px var(--mono); text-transform: uppercase; cursor: pointer; color: var(--ink); }
.tab:last-child { border-right: 0; }
.tab.on { background: var(--ink); color: #fff; }
#sendForm { display: flex; flex-direction: column; gap: 10px; }
textarea, input { width: 100%; min-width: 0; border: 2px solid var(--ink); background: var(--paper); color: var(--ink); padding: 11px 12px; font: 500 15px/1.45 var(--sans); border-radius: 0; resize: vertical; }
input.mono { font: 400 14px var(--mono); }
textarea:focus, input:focus { outline: none; background: #fff; box-shadow: 4px 4px 0 var(--cobalt); }
.drop { display: grid; gap: 4px; place-items: center; text-align: center; min-height: 110px; padding: 16px; border: 2px dashed var(--ink); background: var(--paper); cursor: pointer; font-weight: 700; }
.drop.over { background: var(--lime); }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.send-row { justify-content: space-between; }
.feed { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; max-height: 300px; overflow-y: auto; }
.feed li { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: start; padding: 10px 12px; border: 2px solid var(--ink); background: var(--paper); }
.feed li.in { background: #fff; border-color: var(--cobalt); }
.feed .dir { justify-self: start; align-self: start; font: 700 11px var(--mono); padding: 3px 6px; background: var(--ink); color: #fff; }
.feed li.in .dir { background: var(--cobalt); }
.feed .body { min-width: 0; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 14.5px; }
.feed .body.addr { font-family: var(--mono); font-size: 14px; }
.feed .meta { font: 400 11.5px var(--mono); color: var(--muted); display: block; margin-top: 4px; }
.feed .acts { display: flex; flex-direction: column; gap: 6px; }
.feed img { max-width: 100%; max-height: 220px; display: block; margin-top: 6px; border: 2px solid var(--ink); }
.feed .ok { color: var(--green); font-weight: 700; }
.feed .bad { color: var(--red); font-weight: 700; }
.foot-row { justify-content: flex-end; border-top: 2px solid var(--paper2); padding-top: 12px; }
.remembered { border: 2px solid var(--ink); background: var(--card); padding: 14px 16px; }
.remembered ul { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 8px; }
.remembered li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; justify-content: space-between; }
.hero-right { position: relative; display: flex; flex-direction: column; gap: 14px; min-width: 0; }
#bridge { width: 100%; flex: 1 1 auto; min-height: 420px; max-height: 760px; border: 2px solid var(--ink); background: var(--card); display: block; }
.stats { margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 2px solid var(--ink); background: var(--card); }
.stats div { padding: 10px 14px; border-right: 2px solid var(--ink); min-width: 0; }
.stats div:last-child { border-right: 0; }
.stats dt { font: 700 11px var(--mono); text-transform: uppercase; color: var(--muted); }
.stats dd { margin: 2px 0 0; font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cue { align-self: flex-start; font: 700 13px var(--mono); text-transform: uppercase; color: var(--ink); text-decoration: none; border-bottom: 2px solid var(--ink); }
.cue span { display: inline-block; animation: bob 1.8s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(3px); } }

/* ---------------------------------------------------------------- content */
.content { max-width: 1180px; margin: 0 auto; padding: 0 clamp(16px, 4vw, 40px); }
.sec { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 24px; padding: clamp(56px, 7vw, 92px) 0 0; }
.num { margin: 0; font: 700 64px/1 var(--sans); letter-spacing: -.05em; -webkit-text-stroke: 2px var(--ink); color: transparent; }
.sec h2 { margin: 0 0 18px; font: 700 clamp(28px, 3.6vw, 46px)/1.02 var(--sans); letter-spacing: -.04em; max-width: 20ch; }
.prose { max-width: 66ch; font-size: 17.5px; color: var(--ink2); margin: 0 0 16px; }
.prose.small { font-size: 15px; margin-top: 22px; }
.bul { list-style: none; padding: 0; margin: 24px 0 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border-top: 2px solid var(--ink); border-left: 2px solid var(--ink); }
.bul li { padding: 18px; border-right: 2px solid var(--ink); border-bottom: 2px solid var(--ink); background: var(--card); color: var(--ink2); }
.bul b { color: var(--ink); }
.legend { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.lg { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 14px; padding: 16px; border: 2px solid var(--ink); background: var(--card); }
.lg h3 { margin: 0 0 4px; font: 700 16px var(--sans); }
.lg p { margin: 0; font-size: 14px; color: var(--ink2); }
.sw { width: 40px; height: 40px; border: 2px solid var(--ink); display: grid; place-items: center; font: 700 10px var(--mono); }
.sw-dev { background: var(--cobalt-soft); box-shadow: inset 0 -10px 0 var(--lime); }
.sw-relay { background: var(--ink); }
.sw-pkt { background: var(--cobalt); border-color: var(--cobalt); height: 20px; margin-top: 10px; }
.sw-key { background: var(--lime); height: 20px; margin-top: 10px; }
.sw-arc { border-radius: 50%; border: 4px solid var(--lime); border-left-color: var(--paper2); }
.sw-foot { background: var(--paper); }
.steps { list-style: none; counter-reset: s; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border: 2px solid var(--ink); background: var(--card); }
.steps li { counter-increment: s; padding: 18px 16px 20px; border-right: 2px solid var(--ink); }
.steps li:last-child { border-right: 0; }
.steps li::before { content: "0" counter(s); display: block; font: 700 13px var(--mono); color: var(--cobalt); margin-bottom: 10px; }
.steps h3 { margin: 0 0 6px; font: 700 17px/1.2 var(--sans); }
.steps p { margin: 0; font-size: 14px; color: var(--ink2); }
.pipe { width: 100%; height: auto; margin-top: 24px; }
.pipe .pb { fill: var(--card); stroke: var(--ink); stroke-width: 2; }
.pipe .pb.dark { fill: var(--ink); }
.pipe .pt { font: 700 19px var(--sans); text-anchor: middle; fill: var(--ink); }
.pipe .ps { font: 400 12.5px var(--mono); text-anchor: middle; fill: var(--muted); }
.pipe .w { fill: #fff; }
.pipe .ps.w { fill: var(--lime); }
.pipe .pl { stroke: var(--ink); stroke-width: 2; }
.pipe .pp { fill: var(--cobalt); }
.tech { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border-top: 2px solid var(--ink); }
.tech li { padding: 16px 4px 16px 0; border-bottom: 2px solid var(--ink); color: var(--ink2); margin-right: 22px; }
.tech b { color: var(--ink); }
.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.plan { padding: 22px; border: 2px solid var(--ink); background: var(--card); }
.plan.pro { background: var(--lime); box-shadow: 8px 8px 0 var(--ink); }
.plan h3 { margin: 0 0 8px; font: 700 24px var(--sans); letter-spacing: -.02em; }
.plan ul { margin: 12px 0; padding-left: 20px; display: grid; gap: 6px; }
.price { margin: 0; }
.price b { font: 700 30px var(--sans); letter-spacing: -.03em; }
.burn { display: grid; gap: 10px; margin-top: 14px; padding: 14px; background: var(--card); border: 2px solid var(--ink); }
.burn-st { margin: 0; font-weight: 700; }
.honest, .must { margin: 0; padding: 10px 12px; border-left: 6px solid var(--ink); background: var(--paper); font-size: 14px; }
.must { max-width: 66ch; margin: 6px 0 22px; background: var(--lime); }
.ledger { border: 2px solid var(--ink); background: var(--card); padding: 18px; }
.ledger-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; align-items: baseline; }
.ledger h3 { margin: 0; font: 700 20px var(--sans); }
.ledger-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 0; margin: 14px 0; border: 2px solid var(--ink); }
.ledger-stats > div { padding: 12px; border-right: 2px solid var(--ink); min-width: 0; }
.ledger-stats > div:last-child { border-right: 0; }
.ledger-stats .k { font: 700 11px var(--mono); text-transform: uppercase; color: var(--muted); }
.ledger-stats .v { font: 700 20px var(--sans); overflow-wrap: anywhere; }
.ledger-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; font: 400 13px var(--mono); }
.ledger-list li { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 10px; padding: 6px 0; border-bottom: 1px solid var(--line); }
.see { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border: 2px solid var(--ink); }
.see-c { padding: 20px; background: var(--card); }
.see-c.no { background: var(--ink); color: #fff; }
.see-c h3 { margin: 0 0 10px; font: 700 13px var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.see-c.no h3 { color: var(--lime); }
.see-c ul { margin: 0; padding-left: 18px; display: grid; gap: 8px; font-size: 15px; }
.trust { margin-top: 22px; display: grid; gap: 12px; max-width: 76ch; }
.trust h3 { margin: 0; font: 700 22px var(--sans); }
.trust p { margin: 0; color: var(--ink2); }
.faq { border-top: 2px solid var(--ink); max-width: 860px; }
.faq details { border-bottom: 2px solid var(--ink); }
.faq summary { cursor: pointer; padding: 16px 0; font: 700 18px var(--sans); list-style: none; display: flex; justify-content: space-between; gap: 14px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); }
.faq details[open] summary::after { content: "−"; }
.faq p { margin: 0 0 16px; color: var(--ink2); max-width: 70ch; }
.foot { margin-top: 100px; border-top: 2px solid var(--ink); background: var(--ink); color: #fff; padding: 30px clamp(16px, 4vw, 40px) 36px; }
.foot .fine { color: rgba(255, 255, 255, .62); margin-bottom: 6px; max-width: 72ch; }
.foot-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 420px); gap: 22px; }
.foot-name { margin: 0 0 8px; font-weight: 700; }
.foot-ca { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; align-self: start; padding: 12px; border: 2px solid #fff; min-width: 0; }
.foot .btn { background: transparent; color: #fff; border-color: #fff; }
.copy { max-width: 1180px; margin: 22px auto 0; font: 400 12.5px var(--mono); color: rgba(255, 255, 255, .6); }
.admin { max-width: 1180px; margin: 22px auto 0; border: 2px solid var(--lime); padding: 14px; }
.admin h3 { margin: 0 0 8px; }
.admin ol { margin: 0; padding-left: 18px; display: grid; gap: 6px; font: 400 13px var(--mono); }

/* ---------------------------------------------------------------- dialogs etc */
.modal { border: 2px solid var(--ink); padding: 0; background: var(--card); color: var(--ink); width: min(460px, calc(100vw - 32px)); box-shadow: 10px 10px 0 var(--ink); border-radius: 0; }
.modal::backdrop { background: rgba(14, 14, 16, .55); }
.modal-in { display: grid; gap: 14px; padding: 22px; }
.modal h3 { margin: 0; font: 700 22px var(--sans); }
.modal .big { margin: 0; font: 700 30px var(--sans); background: var(--lime); padding: 4px 8px; overflow-wrap: anywhere; }
.kv { margin: 0; display: grid; gap: 8px; }
.kv dt { font: 700 11px var(--mono); text-transform: uppercase; color: var(--muted); }
.kv dd { margin: 0; overflow-wrap: anywhere; word-break: break-all; }
label { display: grid; gap: 6px; font-weight: 700; }
.wallets { position: fixed; right: 16px; top: 70px; z-index: 40; display: grid; gap: 8px; padding: 12px; background: var(--card); border: 2px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); width: min(300px, calc(100vw - 32px)); }
.wallets button { display: flex; gap: 10px; align-items: center; min-height: 44px; padding: 0 12px; border: 2px solid var(--ink); background: var(--paper); font: 700 14px var(--sans); cursor: pointer; }
.wallets img { width: 22px; height: 22px; }
.toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); z-index: 60; max-width: min(520px, calc(100vw - 32px)); padding: 12px 16px; background: var(--ink); color: #fff; font-weight: 600; box-shadow: 5px 5px 0 var(--cobalt); }
.toast.err { box-shadow: 5px 5px 0 var(--red); }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1080px) {
  .hero { grid-template-columns: minmax(0, 1fr); min-height: 0; }
  #bridge { min-height: 280px; height: 300px; flex: 0 0 auto; }
  .legend { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .steps li { border-right: 0; border-bottom: 2px solid var(--ink); }
  .steps li:last-child { border-bottom: 0; }
}
@media (max-width: 760px) {
  .top { grid-template-columns: minmax(0, 1fr) auto; }
  .nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; }
  .sec { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .num { font-size: 40px; }
  .bul, .legend, .tech, .plans, .see, .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .tech li { margin-right: 0; }
  .qr-wrap { grid-template-columns: minmax(0, 1fr); }
  .qr { max-width: 280px; width: 100%; justify-self: center; }
  .stats { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .stats div:nth-child(2) { border-right: 0; }
  .stats div:last-child { grid-column: 1 / -1; border-top: 2px solid var(--ink); }
}
@media (max-width: 480px) {
  body { font-size: 15px; }
  .card { padding: 16px; box-shadow: 5px 5px 0 var(--ink); }
  #bridge { height: 230px; min-height: 230px; }
  .sas span { font-size: 28px; }
  .feed li { grid-template-columns: minmax(0, 1fr); }
  .feed .acts { flex-direction: row; flex-wrap: wrap; }
  .ledger-list li { grid-template-columns: minmax(0, 1fr) auto; }
  .ledger-list .lt { display: none; }
  .plan.pro { box-shadow: 5px 5px 0 var(--ink); }
  #walletBtn { padding: 0 10px; }
}