:root {
  color-scheme: dark;
  --bg: #0a111d;
  --surface: #101a2a;
  --line: #27384c;
  --text: #eff5fc;
  --muted: #a8b8cd;
  --cyan: #96dff7;
  --red: #ff566f;
  --mono: ui-monospace, SFMono-Regular, Consolas, monospace;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
h1, h2, h3, p, figure { margin: 0; }
.shell { width: min(100% - 48px, 1216px); margin-inline: auto; }
.skip { position: absolute; z-index: 5; top: -5rem; left: 1rem; padding: .5rem 1rem; background: var(--text); color: var(--bg); }
.skip:focus { top: 1rem; }
.site-header { background: #0c1421; border-bottom: 1px solid var(--line); }
.header-inner, .footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 22px; }
.header-inner { min-height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 23px; font-weight: 800; letter-spacing: -.055em; white-space: nowrap; }
.brand img { display: block; }
.brand span span { color: var(--cyan); }
.main-nav, .header-tools, .languages, .footer-inner nav { display: flex; gap: 22px; align-items: center; }
.main-nav, .footer-inner nav { color: var(--muted); font-size: 14px; white-space: nowrap; }
.main-nav a:hover, .main-nav [aria-current], .footer-inner a:hover { color: var(--text); }
.languages { gap: 0; padding: 3px; border: 1px solid var(--line); border-radius: 8px; white-space: nowrap; }
.languages a { border-radius: 5px; padding: 4px 7px; color: var(--muted); font-size: 12px; }
.languages [aria-current], .languages a:hover { background: #223249; color: var(--text); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; min-height: 46px; padding: 9px 16px; border: 1px solid transparent; border-radius: 8px; font-weight: 720; white-space: nowrap; }
.button:hover { filter: brightness(1.15); }
.header-button { min-height: 38px; color: var(--cyan); background: #142337; border-color: #2b415a; padding: 5px 11px; font-size: 13px; }
.primary { background: var(--red); color: #140c15; }
.outline { color: var(--text); border-color: #39516b; background: #111c2c; }
.hero { display: grid; grid-template-columns: .94fr 1fr; align-items: center; gap: clamp(24px, 5vw, 70px); padding: clamp(45px, 7vw, 100px) 0 clamp(38px, 6vw, 74px); }
.hero-copy { min-width: 0; }
.eyebrow, .relay-head { font: 650 12px/1.5 var(--mono); letter-spacing: .10em; color: var(--cyan); }
.eyebrow { text-transform: uppercase; }
.eyebrow i, .relay-head i, .tier-label i { display: inline-block; width: 7px; height: 7px; background: var(--red); margin-right: 10px; border-radius: 50%; box-shadow: 0 0 12px #ff566f85; vertical-align: 1px; }
.hero h1 { margin: 18px 0; font-size: clamp(42px, 5.45vw, 80px); line-height: 1.08; letter-spacing: -.055em; }
.hero h1 em { color: var(--red); font-style: normal; }
.intro { max-width: 57ch; color: var(--muted); font-size: clamp(15px, 1.55vw, 18px); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 25px; }
.relay { border: 1px solid #34465b; border-radius: 17px; background: #0d1726; overflow: hidden; box-shadow: 0 22px 58px #0004; }
.relay-head, .relay figcaption { display: flex; justify-content: space-between; gap: 10px; padding: 13px 17px; }
.relay-head { font-size: 10px; }
.relay-head i { background: var(--cyan); box-shadow: 0 0 12px #96dff785; width: 5px; height: 5px; }
.relay-art { display: block; width: 100%; height: auto; border-block: 1px solid var(--line); }
.relay figcaption { color: var(--muted); font-size: 12px; }
.relay figcaption b { margin-left: 8px; color: var(--text); }
.relay figcaption { flex-wrap: wrap; }
.relay-demo {
  flex: 0 0 100%; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px;
  border-top: 1px solid var(--line); padding-top: 10px;
}
.relay-demo[hidden] { display: none; }
.relay-demo button {
  border: 1px solid #39516b; border-radius: 6px; background: #142337; color: var(--cyan);
  padding: 5px 9px; font: inherit; font-weight: 700; cursor: pointer; flex: none;
}
.relay-demo button:hover { border-color: var(--cyan); background: #1b3047; }
.relay-demo button:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
.relay-demo button[aria-disabled="true"] { cursor: wait; }
.relay-status { color: var(--muted); }
.relay-steps {
  flex: 0 0 100%; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px; margin: 2px 0 0; padding: 0; list-style: none; counter-reset: relay-step;
}
.relay-steps[hidden] { display: none; }
.relay-steps li {
  counter-increment: relay-step; border: 1px solid var(--line); border-radius: 8px;
  padding: 9px 11px; background: #101b2b;
}
.relay-steps strong { color: var(--text); font-size: 13px; }
.relay-steps strong::before { content: counter(relay-step, decimal-leading-zero) " "; color: var(--cyan); font-family: var(--mono); }
.relay-steps p { margin-top: 3px; }
.relay-steps [aria-current="step"] { border-color: #74b9d2; background: #172c42; }
.relay-usdt { visibility: hidden; }
.relay[data-step="4"] .relay-usdt { visibility: visible; }
.relay-diagram, .diagram-frame { visibility: hidden; }
.relay[data-step] .relay-diagram,
.relay[data-step="1"] .diagram-tiers,
.relay[data-step="2"] :is(.diagram-payment, .diagram-agent),
.relay[data-step="3"] :is(.diagram-energy, .diagram-agent),
.relay[data-step="4"] .diagram-transfer { visibility: visible; }
.relay-diagram text { fill: var(--text); text-anchor: middle; font: 650 16px system-ui, sans-serif; }
.relay-diagram .diagram-unit { fill: var(--muted); font-size: 12px; }
.relay-diagram .diagram-token { fill: var(--cyan); font: 700 18px var(--mono); }
.diagram-chip { fill: #17253a; stroke: #3c5871; stroke-width: 1.5px; }
.diagram-choice, .relay[data-step="3"] .diagram-wallet rect { fill: #183344; stroke: #91def3; stroke-width: 2px; }
.diagram-route { fill: none; stroke: #57748b; stroke-width: 2px; }
@media (prefers-reduced-motion: no-preference) {
  .relay[data-step="1"] .diagram-choice { animation: diagram-select 1.4s ease-out; }
  .relay[data-step="2"] .diagram-payment .diagram-pulse,
  .relay[data-step="3"] .diagram-energy .diagram-pulse,
  .relay[data-step="4"] .diagram-transfer .diagram-pulse { animation: signal-travel 1.35s ease-out; }
}
@keyframes diagram-select {
  0% { fill: #17253a; stroke: #3c5871; }
  55% { fill: #244a63; stroke: #b6eeff; }
}
.relay-orbit { transform-box: view-box; transform-origin: center; }
.relay-bolt, .relay-halo, .relay-orbit { transition: filter .28s, opacity .28s; }
.relay:is(:focus-within, [data-step="3"]) .relay-bolt { filter: drop-shadow(0 0 12px #ff566f); }
.relay-signal {
  fill: none; stroke: #a8eaff; stroke-width: 3; stroke-linecap: round;
  stroke-dasharray: 18 100; stroke-dashoffset: 18; opacity: 0;
}
@media (hover: hover) {
  .relay:hover .relay-bolt { filter: drop-shadow(0 0 12px #ff566f); }
}
@media (prefers-reduced-motion: no-preference) {
  .relay[data-loop]:not([data-step]) .relay-orbit { animation: orbit-shift 6s ease-in-out infinite; }
  .relay[data-loop]:not([data-step]) .signal-in { animation: signal-loop 6s .4s linear infinite; }
  .relay[data-loop]:not([data-step]) .signal-out { animation: signal-loop 6s 2.2s linear infinite; }
  .relay[data-motion-paused]:not([data-step]) :is(.relay-orbit, .relay-signal) { animation-play-state: paused; }
  .relay[data-step="2"] .signal-in, .relay[data-step="3"] .signal-out, .relay[data-step="4"] .signal-usdt {
    animation: signal-travel 1.3s ease-out;
  }
  .relay[data-step="1"] .relay-orbit { animation: orbit-shift 1.4s ease-in-out; }
}
@media (prefers-reduced-motion: reduce) {
  .relay-bolt, .relay-halo, .relay-orbit { transition: none; }
  .relay-demo [data-motion-toggle] { display: none; }
}
@keyframes orbit-shift {
  0%, 100% { transform: rotate(0); }
  50% { transform: rotate(23deg); }
}
@keyframes signal-travel {
  0% { stroke-dashoffset: 18; opacity: 0; }
  15%, 85% { opacity: 1; }
  100% { stroke-dashoffset: -100; opacity: 0; }
}
@keyframes signal-loop {
  0% { stroke-dashoffset: 18; opacity: 0; }
  3%, 16% { opacity: 1; }
  19%, 100% { stroke-dashoffset: -100; opacity: 0; }
}
.section { border-top: 1px solid var(--line); padding: 35px 0 46px; }
.section h2, .partner h2 { margin: 6px 0 21px; font-size: clamp(25px, 3.5vw, 41px); line-height: 1.2; letter-spacing: -.035em; }
.tier-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.tier { padding: clamp(17px, 3vw, 28px); background: linear-gradient(130deg,#15243a,#111a29); border: 1px solid #32475e; border-radius: 12px; }
.tier-label { font-size: 14px; color: var(--cyan); font-weight: 650; }
.tier-label i { background: var(--cyan); box-shadow: none; }
.tier:nth-child(2) .tier-label { color: #ff9aab; }
.tier:nth-child(2) .tier-label i { background: var(--red); }
.tier strong { display: block; margin: 7px 0; font: 700 clamp(25px, 4.1vw, 49px)/1.2 var(--mono); letter-spacing: -.055em; }
.tier small { color: var(--muted); font-size: 12px; letter-spacing: .04em; }
.tier p, .note, .steps p, .partner p:not(.eyebrow), .guide p, .faq p, .footer-inner p { color: var(--muted); }
.note { font-size: 13px; margin-top: 13px; }
.steps, .guide { list-style: none; margin: 0; padding: 0; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-bottom: 16px; }
.steps li { padding: 16px; border: 1px solid var(--line); border-radius: 10px; background: #101a2a; }
.steps li > span, .guide li > span { color: var(--red); font: 650 13px var(--mono); }
.steps h3 { margin: 6px 0; }
.text-link { color: var(--cyan); display: inline-flex; gap: 7px; }
.text-link:hover { text-decoration: underline; }
.partner { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin: 5px 0 55px; padding: clamp(22px, 4vw, 39px); background: linear-gradient(110deg,#1b2031,#171a2b 72%,#321c2a); border: 1px solid #513348; border-radius: 12px; }
.partner h2 { margin-bottom: 8px; }
.partner p { max-width: 64ch; }
.site-footer { padding: 26px 0 37px; border-top: 1px solid var(--line); }
.footer-inner p { margin-top: 5px; font-size: 13px; }
.page-title { padding: 60px 0 35px; }
.page-title h1 { font-size: clamp(34px, 6vw, 67px); line-height: 1.15; letter-spacing: -.045em; margin: 12px 0; }
.guide { margin-bottom: 38px; }
.guide li { display: grid; grid-template-columns: 34px 1fr; gap: 14px; padding: 19px 0; border-top: 1px solid var(--line); }
.guide li > span { padding-top: 8px; }
.guide h2 { font-size: clamp(20px, 2.6vw, 27px); margin-bottom: 4px; }
.faq { max-width: 920px; display: grid; gap: 8px; }
.faq details { padding: 14px 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  cursor: pointer; font-weight: 700; list-style: none;
}
.faq p { padding-top: 7px; }
.page-actions { margin-bottom: 55px; }

.tier, .steps li, .partner, .guide li, .faq details {
  --card-accent: #75c7e0;
  transition: border-color .22s ease, background-color .22s ease, box-shadow .22s ease, transform .22s ease;
}
.tier:nth-child(2), .partner { --card-accent: #ff8195; }
.guide li { border-radius: 6px; padding-inline: 10px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; width: 8px; height: 8px; flex: none; margin-right: 3px;
  border-right: 2px solid var(--cyan); border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg); transition: transform .22s ease;
}
.faq details[open] { border-color: #517389; background: #142034; }
.faq details[open] summary::after { transform: rotate(225deg); }
.partner:focus-within, .faq details:focus-within { border-color: var(--card-accent); }
@media (hover: hover) {
  :is(.tier, .steps li, .partner, .guide li, .faq details):hover {
    border-color: var(--card-accent); box-shadow: 0 10px 24px #0004;
  }
  :is(.tier, .steps li, .partner):hover { transform: translateY(-3px); }
  .guide li:hover { background: #101a2a; }
}

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.page-loading {
  position: fixed; z-index: 4; inset: 0; overflow: hidden; pointer-events: none;
  padding-top: clamp(72px, 14vh, 148px); background: #0a111df5;
}
.loading-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: center; }
.skeleton { border-radius: 8px; background-color: #162336; }
.loading-title { width: 66%; height: clamp(30px, 5vw, 58px); margin-bottom: 22px; }
.loading-line { width: 86%; height: 12px; margin-bottom: 12px; }
.loading-line.short { width: 56%; }
.loading-card { height: clamp(130px, 31vw, 340px); border: 1px solid #26374d; border-radius: 16px; }
.loading-tiles { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.loading-tiles .skeleton { height: clamp(72px, 14vw, 145px); }
.loading-rows { display: none; }
.page-loading[data-layout="article"] :is(.loading-card, .loading-tiles) { display: none; }
.page-loading[data-layout="article"] :is(.loading-copy, .loading-rows) { grid-column: 1 / -1; }
.page-loading[data-layout="article"] .loading-rows { display: grid; gap: 12px; }
.loading-rows .skeleton { height: 53px; }
@media (prefers-reduced-motion: no-preference) {
  .faq details[open] p { animation: answer-enter .24s ease-out; }
  .skeleton {
    background-image: linear-gradient(100deg, transparent 22%, #91d4ff26 49%, transparent 74%);
    background-size: 220% 100%; animation: skeleton-sweep 1.25s linear 4;
  }
}
@media (prefers-reduced-motion: reduce) {
  .tier, .steps li, .partner, .guide li, .faq details, .faq summary::after { transition: none; }
  :is(.tier, .steps li, .partner):hover { transform: none; }
}
@keyframes answer-enter {
  from { opacity: .45; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes skeleton-sweep {
  from { background-position: 100% 0; }
  to { background-position: -100% 0; }
}
@media (max-width: 900px) {
  .header-inner { flex-wrap: wrap; gap: 8px 16px; padding: 11px 0; }
  .main-nav { order: 3; flex-basis: 100%; gap: 20px; }
  .hero { gap: 24px; }
}
@media (max-width: 660px) {
  .shell { width: calc(100% - 32px); }
  .header-tools { gap: 9px; }
  .header-button { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 42px; }
  .hero h1 { font-size: clamp(38px, 9.4vw, 57px); }
  .relay-steps { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 11px; }
  .partner, .footer-inner { align-items: flex-start; flex-direction: column; }
  .footer-inner nav { flex-wrap: wrap; gap: 12px; }
  .tier strong small { display: block; margin-top: 5px; }
  .loading-layout { grid-template-columns: 1fr; gap: 16px; }
}