:root {
  --canvas: #12151a;
  --surface: #1a1f27;
  --surface-2: #222833;
  --ink: #e8ecef;
  --muted: #8b949e;
  --faint: #6b7380;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --signal: #3ecf8e;
  --signal-ink: #0b1410;
  --busy: #e2a23a;
  --fault: #ef6a6a;
  --glow: rgba(62, 207, 142, 0.18);
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Sarasa Mono SC",
    Menlo, Consolas, monospace;
  --max: 1120px;
  --ease: 180ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  overflow-wrap: anywhere;
  background-color: var(--canvas);
  background-image: radial-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 22px 22px;
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: var(--signal);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: #6ee0aa;
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--signal);
  color: var(--signal-ink);
  border-radius: 6px;
}

.skip:focus {
  top: 12px;
}

.wrap {
  box-sizing: border-box;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: 20px;
}

.mono {
  font-family: var(--mono);
  font-size: 0.86em;
}

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.top-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  color: var(--ink);
  text-decoration: none;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.brand:hover {
  color: var(--ink);
}

.mark {
  width: 28px;
  height: 28px;
  color: var(--signal);
  flex: none;
}

.top nav {
  display: flex;
  align-items: center;
  gap: 8px 18px;
  margin-left: auto;
}

.top-download {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 8px;
  background: var(--signal);
  color: var(--signal-ink);
  font-weight: 600;
  text-decoration: none;
}

.top-download:hover {
  background: #4bd99a;
  color: var(--signal-ink);
}

.top nav a {
  color: var(--muted);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.top nav a:hover,
.top nav a[aria-current="page"] {
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.btn-solid {
  background: var(--signal);
  color: var(--signal-ink);
}

.btn-solid:hover {
  background: #4bd99a;
  color: var(--signal-ink);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}

.btn-ghost:hover {
  background: var(--surface);
  color: var(--ink);
}

.btn-sm {
  min-height: 40px;
  padding: 0 14px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px;
  align-items: center;
  padding: 56px 0 36px;
}

.hero > * {
  min-width: 0;
}

.kicker {
  margin: 0 0 12px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(1.55rem, 1.15rem + 1.5vw, 2.35rem);
}

.h1-line {
  display: block;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.45rem, 3vw, 1.9rem);
}

.lede {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 38rem;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.fine {
  margin: 0;
  color: var(--faint);
  font-size: 0.92rem;
  overflow-wrap: anywhere;
}

.board {
  position: relative;
  max-width: 100%;
  background: linear-gradient(180deg, #171c24 0%, #12161c 100%);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 16px 16px 14px;
  box-shadow:
    0 24px 50px rgba(0, 0, 0, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  overflow: hidden;
}

.board::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(62, 207, 142, 0.05) 46%,
    transparent 52%
  );
  animation: scan 8s linear infinite;
}

.board-cols,
.lane,
.board-note {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1.1fr) minmax(0, 1fr) 4.6rem;
  gap: 8px;
  align-items: center;
}

.board-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 12px;
}

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 10px var(--signal);
}

.board-cols {
  margin: 0 0 6px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.board-lanes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.lane {
  padding: 10px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  min-height: 52px;
}

.track {
  font-family: var(--mono);
  color: var(--faint);
}

.who,
.what {
  min-width: 0;
}

.who {
  font-weight: 600;
}

.what,
.st {
  color: var(--muted);
  font-size: 0.92rem;
}

.st {
  text-align: right;
  font-family: var(--mono);
  font-size: 12px;
}

.lane:nth-child(1) {
  animation: lane-busy 8s ease-in-out infinite;
}

.lane:nth-child(2) {
  animation: lane-busy 8s ease-in-out infinite 2.1s;
}

.lane:nth-child(3) {
  animation: lane-live 8s ease-in-out infinite 4.2s;
}

.board-note {
  grid-template-columns: auto 1fr;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.token {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--signal);
  color: var(--signal-ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  animation: token-on 8s ease-in-out infinite;
}

section {
  padding: 28px 0 12px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.bounds {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.bound {
  padding: 18px 18px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.bound strong {
  display: block;
  margin-bottom: 6px;
}

.bound p {
  margin: 0;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
}

.steps li {
  counter-increment: step;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.steps li::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: 8px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.steps h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.steps p {
  margin: 0;
  color: var(--muted);
}

.how-more {
  margin: 16px 0 0;
  color: var(--muted);
}

.how-more a {
  color: var(--ink);
}

.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.feature {
  background: var(--surface);
  padding: 22px 22px 20px;
}

.feature h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.cta-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 36px 0 12px;
  padding: 22px 24px;
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.cta-band p {
  margin: 4px 0 0;
  color: var(--muted);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.foot {
  margin-top: 48px;
  padding: 22px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.foot-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: space-between;
}

.foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
}

.foot a {
  color: var(--muted);
  text-decoration: none;
}

.foot a:hover {
  color: var(--ink);
}

/* download */
.dl-hero {
  padding: 48px 0 12px;
  max-width: 40rem;
}

.dl-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.primary-box {
  margin: 8px 0 28px;
}

.primary-box .btn {
  min-width: min(100%, 280px);
}

#primary-hint {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.callout {
  padding: 14px 16px;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--busy) 45%, var(--line));
  background: color-mix(in srgb, var(--busy) 12%, var(--surface));
  color: var(--ink);
  margin: 0 0 20px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.os-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.os-card {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.os-card.is-preferred {
  border-color: color-mix(in srgb, var(--signal) 55%, var(--line));
  box-shadow: 0 0 0 1px var(--glow);
}

.os-card h2 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.os-card p,
.os-card .file {
  margin: 0 0 14px;
  color: var(--muted);
}

.file {
  font-family: var(--mono);
  font-size: 12px;
  word-break: break-all;
}

.faq {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

.faq details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 16px 8px;
}

.faq summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  cursor: pointer;
  font-weight: 650;
}

.faq p,
.faq pre {
  color: var(--muted);
}

/* purchase */
.buy-hero {
  max-width: 48rem;
  padding: 52px 0 20px;
}

.buy-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.offer-note {
  margin: 8px 0 24px;
  padding: 14px 16px;
  border: 1px solid color-mix(in srgb, var(--signal) 55%, var(--line));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--signal) 9%, var(--surface));
  color: var(--ink);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
}

.section-head h2,
.section-head .kicker {
  margin-bottom: 0;
}

.section-head > p {
  max-width: 32rem;
  margin: 0;
  color: var(--muted);
}

.price-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.price-card {
  display: flex;
  flex-direction: column;
  min-height: 250px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.price-card.featured {
  border-color: color-mix(in srgb, var(--signal) 68%, var(--line));
  box-shadow: 0 0 0 1px var(--glow);
}

.price-card h3 {
  margin: 18px 0 6px;
  font-size: 1.15rem;
}

.price-card > p:last-child {
  margin: auto 0 0;
  color: var(--muted);
}

.price-tag {
  align-self: flex-start;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--signal);
  color: var(--signal-ink);
  font-size: 12px;
  font-weight: 700;
}

.muted-tag {
  background: var(--surface-2);
  color: var(--muted);
}

.price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 18px;
}

.price strong {
  font-family: var(--mono);
  font-size: 2.2rem;
  line-height: 1;
}

.price span {
  color: var(--muted);
}

.buy-check {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
  gap: 28px;
  margin-top: 30px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.buy-check h2,
.buy-check .kicker {
  margin-bottom: 0;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.check-list strong {
  color: var(--ink);
}

.buy-steps {
  margin-bottom: 18px;
}

.contact-card {
  display: grid;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.contact-card h3,
.contact-card p {
  margin: 0 0 8px;
}

.contact-card > div:first-child > p:not(.fine) {
  color: var(--muted);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.copy-status {
  flex-basis: 100%;
  min-height: 1.5em;
  margin: 0;
  color: var(--signal);
  font-size: 0.92rem;
}

.faq pre {
  padding: 12px;
  overflow-x: auto;
  background: #0e1218;
  border-radius: 8px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
}

.legal-body {
  max-width: 40rem;
  padding: 40px 0 24px;
}

.legal-body p {
  color: var(--muted);
}

@keyframes scan {
  from {
    transform: translateY(-60%);
  }
  to {
    transform: translateY(60%);
  }
}

@keyframes lane-busy {
  0%,
  6% {
    opacity: 0.55;
    border-color: var(--line);
  }
  12%,
  28% {
    opacity: 1;
    border-color: color-mix(in srgb, var(--busy) 70%, var(--line));
    background: color-mix(in srgb, var(--busy) 10%, transparent);
  }
  36%,
  100% {
    opacity: 0.62;
    border-color: var(--line);
  }
}

@keyframes lane-live {
  0%,
  52% {
    opacity: 0.5;
    border-color: var(--line);
  }
  60%,
  100% {
    opacity: 1;
    border-color: color-mix(in srgb, var(--signal) 70%, var(--line));
    background: color-mix(in srgb, var(--signal) 10%, transparent);
  }
}

@keyframes token-on {
  0%,
  58% {
    opacity: 0.25;
    transform: scale(0.85);
  }
  66%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 880px) {
  .hero,
  .bounds,
  .steps,
  .os-grid,
  .price-grid,
  .buy-check {
    grid-template-columns: 1fr;
  }

  .section-head {
    display: block;
  }

  .section-head > p {
    margin-top: 10px;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 28px;
    padding-top: 32px;
  }
}

@media (max-width: 640px) {
  .wrap {
    padding-inline: 22px;
    width: auto;
  }

  .brand {
    margin-right: 0;
  }

  .actions {
    flex-direction: column;
    align-items: stretch;
  }

  .top-bar {
    padding: 12px 0;
  }

  .top-bar nav {
    order: 3;
    flex-basis: 100%;
    margin-left: 0;
    justify-content: flex-start;
    gap: 18px;
  }

  .top-download {
    order: 4;
    flex-basis: 100%;
  }

  .board-cols {
    display: none;
  }

  .lane {
    grid-template-columns: 2.2rem minmax(0, 1fr) auto;
    grid-template-areas:
      "track who st"
      "track what st";
  }

  .track {
    grid-area: track;
  }
  .who {
    grid-area: who;
  }
  .what {
    grid-area: what;
  }
  .st {
    grid-area: st;
  }

  .cta-band {
    align-items: stretch;
  }

  .cta-band .btn {
    width: 100%;
  }

  .cta-actions {
    width: 100%;
  }

  .contact-actions .btn {
    width: 100%;
  }
}

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

  .board::after,
  .lane:nth-child(1),
  .lane:nth-child(2),
  .lane:nth-child(3),
  .token {
    animation: none;
  }

  .lane:nth-child(1),
  .lane:nth-child(2) {
    opacity: 0.7;
    border-color: color-mix(in srgb, var(--busy) 50%, var(--line));
  }

  .lane:nth-child(3) {
    opacity: 1;
    border-color: color-mix(in srgb, var(--signal) 70%, var(--line));
    background: color-mix(in srgb, var(--signal) 10%, transparent);
  }

  .token {
    opacity: 1;
  }
}