:root {
  --bg: #0d0f0a;
  --surface: #151810;
  --surface-2: #1b1f14;
  --ink: #f3f0e6;
  --muted: #a39e92;
  --line: rgba(243, 240, 230, 0.14);
  --accent: #d6f25c;
  --paper: #e7e1d2;
  --paper-ink: #1a1b16;
  --paper-muted: #5c584e;
  --stamp: #e07a5f;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 14px;
  --wrap: min(1180px, calc(100% - 2.4rem));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
html[lang="zh-Hans"] body { font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif; }
html[lang="ja"] body { font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", Meiryo, "Noto Sans JP", sans-serif; }
html[lang="hi"] body { font-family: system-ui, -apple-system, "Nirmala UI", "Kohinoor Devanagari", "Noto Sans Devanagari", sans-serif; }
a { color: inherit; }
button, input { font: inherit; }
::selection { background: var(--accent); color: #16170f; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--accent);
  color: #16170f;
  padding: 0.4rem 0.7rem;
  z-index: 40;
}
.skip:focus { top: 0.6rem; }

.wrap { width: var(--wrap); margin-inline: auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(13, 15, 10, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}
.bar {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  min-height: 3.6rem;
}
.logo {
  text-decoration: none;
  font-family: var(--mono);
  letter-spacing: 0.08em;
  font-weight: 500;
  font-size: 1.05rem;
}
.logo span { color: var(--accent); }
.site-header nav {
  display: flex;
  gap: 1rem;
  margin-left: 0.4rem;
}
.site-header nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  transition: color 160ms ease;
}
.site-header nav a:hover { color: var(--ink); }
.langs {
  margin-left: auto;
  display: flex;
  gap: 0.15rem;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.langs a {
  color: var(--muted);
  padding: 0.35rem 0.52rem;
  line-height: 1;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  border-radius: 999px;
  transition: color 160ms ease, background 160ms ease;
}
.langs a:hover { color: var(--paper); }
.langs a[aria-current="page"] {
  background: var(--accent);
  color: #16170f;
}
.bar-wa,
.bar-tg {
  text-decoration: none;
  font-weight: 700;
  padding: 0.55rem 0.8rem;
  line-height: 1;
  flex: none;
  border-radius: 7px;
  transition: transform 160ms ease, filter 160ms ease;
}
.bar-wa:hover,
.bar-tg:hover { transform: translateY(-1px); filter: brightness(1.06); }
.bar-wa { background: var(--accent); color: #16170f; }
.bar-tg { background: #2aabee; color: #04131c; }

.screen {
  position: relative;
  overflow: hidden;
  padding: 1.6rem 0 1.65rem;
  background:
    radial-gradient(circle at 80% 10%, rgba(214, 242, 92, 0.08), transparent 30rem),
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: auto, 48px 48px, 48px 48px;
}
.screen-stack { position: relative; display: grid; gap: 0.9rem; }
.screen-top {
  position: relative;
  padding-left: 1.1rem;
  border-left: 3px solid var(--accent);
}
.eyebrow {
  margin: 0 0 0.35rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
}
h1 {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.4rem 1.2rem;
  margin: 0;
}
.price {
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(3rem, 6vw, 4.6rem);
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--accent);
  text-shadow: 0 0 36px rgba(214, 242, 92, 0.12);
}
.unit {
  font-size: 0.34em;
  letter-spacing: 0.08em;
  margin-left: 0.35rem;
}
.headline {
  max-width: 14em;
  font-size: clamp(1.45rem, 2.5vw, 2.15rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  padding-bottom: 0.28rem;
  text-wrap: balance;
}
html[lang="zh-Hans"] .headline,
html[lang="ja"] .headline {
  word-break: keep-all;
  line-break: strict;
}
.tagline {
  margin: 0.6rem 0 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
}
.steps li {
  position: relative;
  overflow: hidden;
  margin: 0;
  padding: 0.9rem 1rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--surface-2), var(--surface));
  min-height: 100%;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.steps li::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 2px;
  background: var(--accent);
  opacity: 0;
}
.steps li:hover { transform: translateY(-2px); border-color: rgba(214, 242, 92, 0.45); }
.steps li:first-child {
  border-color: rgba(214, 242, 92, 0.7);
  background: linear-gradient(145deg, rgba(214, 242, 92, 0.08), var(--surface));
}
.steps li:first-child::after { opacity: 1; }
.steps span {
  display: block;
  font-family: var(--mono);
  color: var(--accent);
  font-size: 1rem;
  line-height: 1;
  letter-spacing: 0.08em;
}
.steps h2 {
  margin: 0.45rem 0 0.25rem;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}
.steps p { margin: 0; color: var(--muted); }

.contact-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}
.wa-band,
.tg-band {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 5rem;
  padding: 0.65rem 0.8rem;
  text-decoration: none;
  min-width: 0;
  border-radius: var(--radius);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.wa-band { background: linear-gradient(135deg, #e3fb72, var(--accent)); color: #16170f; }
.tg-band { background: linear-gradient(135deg, #50c6ff, #2aabee); color: #04131c; }
.wa-band:hover,
.tg-band:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(0, 0, 0, 0.22); }
.wa-band svg,
.tg-band svg { width: 1.7rem; height: 1.7rem; flex: none; }
.contact-qr {
  width: 4.4rem;
  height: 4.4rem;
  background: #fff;
  flex: none;
  padding: 0.2rem;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.12);
}
.contact-qr svg { width: 100%; height: 100%; display: block; }
.contact-qr[hidden] { display: none; }
.wa-copy { display: grid; min-width: 0; }
.wa-copy strong {
  font-size: clamp(1.2rem, 2vw, 1.65rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
  text-wrap: balance;
}
.wa-copy small {
  font-family: var(--mono);
  font-size: 0.85rem;
}
.wa-copy small:empty { display: none; }
.wa-go {
  margin-left: auto;
  border: 1px solid currentColor;
  border-radius: 8px;
  padding: 0.55rem 0.75rem;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}
.wa-band:hover .wa-go { background: #16170f; color: var(--accent); }
.tg-band:hover .wa-go { background: #04131c; color: #2aabee; }

.pay {
  display: grid;
  grid-template-columns: minmax(12rem, 0.7fr) 1fr 1fr;
  gap: 0.65rem;
  align-items: stretch;
}
.pay-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.025);
}
.pay-copy p:first-child {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.pay-copy h2 {
  margin: 0.2rem 0 0.35rem;
  font-size: 1.7rem;
  letter-spacing: -0.03em;
}
.pay-copy p:last-child { margin: 0; color: var(--muted); font-size: 0.92rem; }

.coin {
  display: grid;
  grid-template-columns: 6.6rem 1fr;
  gap: 0.75rem;
  align-items: center;
  position: relative;
  background: linear-gradient(145deg, #f4efe3, var(--paper));
  color: var(--paper-ink);
  padding: 0.7rem;
  min-width: 0;
  border-radius: var(--radius);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.14);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.coin > div { min-width: 0; }
.coin:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(0,0,0,0.2); }
.coin::after {
  content: "USDT";
  position: absolute;
  right: 0.75rem;
  top: 0.55rem;
  font: 500 0.62rem/1 var(--mono);
  letter-spacing: 0.1em;
  color: rgba(26, 27, 22, 0.35);
}
.qr {
  width: 6.6rem;
  height: 6.6rem;
  background: #fff;
  padding: 0.2rem;
  border-radius: 8px;
}
.qr svg { width: 100%; height: 100%; display: block; }
.qr.is-empty { background: #f4f1e8; }
.chain {
  margin: 0;
  font-weight: 700;
  font-size: 1.05rem;
}
.chain em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  margin-left: 0.35rem;
  color: var(--paper-muted);
  border: 1px solid rgba(26,27,22,0.18);
  border-radius: 999px;
  padding: 0.18rem 0.35rem;
}
.addr {
  margin: 0.25rem 0 0.45rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
}
.coin button {
  border: 1px solid #1a1b16;
  background: transparent;
  padding: 0.28rem 0.5rem;
  cursor: pointer;
  line-height: 1;
  border-radius: 5px;
  font-size: 0.78rem;
}
.coin button:hover { background: #1a1b16; color: var(--paper); }

.band {
  background:
    radial-gradient(circle at 10% 20%, rgba(214, 242, 92, 0.13), transparent 26rem),
    var(--paper);
  color: var(--paper-ink);
  padding: 3.5rem 0;
}
.panel { padding: 3.5rem 0; }
.section-head h2 {
  margin: 0.3rem 0 0;
  max-width: 16em;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.index, .band .index {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.panel .index { color: var(--accent); }
.band .index { color: #3f4d16; }
.sub { max-width: 38rem; margin: 0.7rem 0 0; }
.panel .sub { color: var(--muted); }
.band .sub, .band .faqs p { color: var(--paper-muted); }

.scope {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 2rem;
  counter-reset: item;
}
.scope li {
  counter-increment: item;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.8rem 0;
  border-top: 1px solid rgba(26, 27, 22, 0.16);
  transition: padding-left 160ms ease;
}
.scope li:hover { padding-left: 0.35rem; }
.scope li::before {
  content: counter(item, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: #3f4d16;
}
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}
.deny { list-style: none; margin: 0; padding: 0; }
.deny li {
  position: relative;
  padding: 0.8rem 0 0.8rem 1.7rem;
  border-top: 1px solid var(--line);
}
.deny li::before {
  content: "×";
  position: absolute;
  left: 0;
  color: var(--stamp);
  font: 500 1.15rem/1 var(--mono);
}
.deny li:last-child { border-bottom: 1px solid var(--line); }

.faq-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 2rem;
}
.faqs details { border-top: 1px solid rgba(26, 27, 22, 0.16); }
.faqs details:last-child { border-bottom: 1px solid rgba(26, 27, 22, 0.16); }
.faqs summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  font-weight: 700;
  transition: color 160ms ease;
}
.faqs summary:hover { color: #445412; }
.faqs summary::-webkit-details-marker { display: none; }
.faqs summary::after { content: "+"; font-family: var(--mono); font-weight: 400; }
.faqs details[open] summary::after { content: "–"; }
.faqs details p { margin: 0 0 0.9rem; }

.close {
  padding: 3.2rem 0 2.6rem;
  background: radial-gradient(circle at 20% 50%, rgba(214,242,92,0.06), transparent 26rem);
}
.close h2 {
  margin: 0;
  max-width: 12em;
  font-size: clamp(1.8rem, 4vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.lede { max-width: 36rem; margin: 0.7rem 0 1rem; color: var(--muted); }
.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}
.site-footer .wrap { padding: 1rem 0 1.2rem; }
.dock { display: none; }
.dock a { color: inherit; text-decoration: none; }

@media (max-width: 900px) {
  .pay, .split, .faq-grid, .scope { grid-template-columns: 1fr; }
  .site-header nav { display: none; }
  .bar { flex-wrap: wrap; padding: 0.45rem 0; }
  .langs { order: 5; width: 100%; margin-left: 0; }
  .pay { grid-template-columns: 1fr 1fr; }
  .pay-copy { grid-column: 1 / -1; padding-top: 0; }
}

@media (max-width: 640px) {
  :root { --wrap: min(100% - 1.15rem, 1180px); --radius: 10px; }
  .site-header { position: relative; }
  .bar { gap: 0.45rem; }
  .logo { margin-right: auto; }
  .langs {
    order: 5;
    overflow-x: auto;
    width: 100%;
    justify-content: space-between;
  }
  .langs a { flex: 1; }
  .bar-wa,
  .bar-tg { padding: 0.48rem 0.55rem; font-size: 0.82rem; }
  .screen { padding: 0.9rem 0 1.1rem; background-size: auto, 32px 32px, 32px 32px; }
  .screen-stack { gap: 0.65rem; }
  .screen-top { padding-left: 0.7rem; }
  .price { font-size: 2.5rem; }
  .headline { font-size: 1.15rem; }
  .tagline { font-size: 0.82rem; line-height: 1.45; }
  .steps { grid-template-columns: repeat(3, 1fr); gap: 0.4rem; }
  .steps li { padding: 0.55rem 0.4rem 0.65rem; }
  .steps p { display: none; }
  .steps h2 { font-size: 0.95rem; margin-top: 0.3rem; }
  .steps span { font-size: 1rem; }
  .contact-row { gap: 0.4rem; }
  .wa-band,
  .tg-band {
    min-height: 0;
    padding: 0.6rem 0.55rem;
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }
  .contact-qr { width: 3.4rem; height: 3.4rem; }
  .wa-copy strong { font-size: 1rem; }
  .wa-go { margin-left: 0; white-space: normal; }
  .pay { grid-template-columns: 1fr 1fr; }
  .pay-copy { grid-column: 1 / -1; }
  .pay-copy { padding: 0.65rem 0.7rem; }
  .pay-copy h2 { font-size: 1.35rem; }
  .pay-copy p:last-child { font-size: 0.78rem; }
  .coin { grid-template-columns: 4.1rem 1fr; gap: 0.4rem; padding: 0.4rem; }
  .qr { width: 4.1rem; height: 4.1rem; }
  .addr { font-size: 0.62rem; margin-bottom: 0.3rem; }
  .dock {
    display: grid;
    grid-template-columns: 1fr 1fr;
    position: fixed;
    left: 0.6rem;
    right: 0.6rem;
    bottom: 0.6rem;
    z-index: 25;
    gap: 0.4rem;
  }
  .dock a {
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    padding: 0.85rem 0.5rem;
  }
  .dock a[data-wa] { background: var(--accent); color: #16170f; }
  .dock a[data-tg] { background: #2aabee; color: #04131c; }
  body { padding-bottom: 4.4rem; }
  .site-footer .wrap { padding-bottom: 0.4rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}