:root {
  color-scheme: dark;
  --color-background: #050505;
  --color-surface: #0d0d0d;
  --color-surface-muted: #151515;
  --color-border-subtle: #1c1c1e;
  --color-border: #303033;
  --color-text-primary: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-text-muted: #6e6e73;
  --color-accent: #f5f5f7;
  --color-signal: #45c486;
  --header-background: rgba(0, 0, 0, 0.96);
  --layout-max: 1180px;
  --radius-small: 8px;
  --radius-medium: 18px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --color-background: #f7f7f5;
  --color-surface: #ffffff;
  --color-surface-muted: #eeeeeb;
  --color-border-subtle: #ddddda;
  --color-border: #c6c6c2;
  --color-text-primary: #111113;
  --color-text-secondary: #4d4d52;
  --color-text-muted: #69696f;
  --color-accent: #111113;
  --color-signal: #147a4f;
  --header-background: rgba(247, 247, 245, 0.96);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text-primary);
  background: var(--color-background);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-signal);
  outline-offset: 4px;
}

p,
h1,
h2,
h3,
ul,
ol {
  margin: 0;
}

.shell {
  width: min(calc(100% - 64px), var(--layout-max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--color-border-subtle);
  background: var(--header-background);
}

.header-inner {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand img {
  display: block;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: 7px;
  object-fit: cover;
}

.desktop-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.desktop-nav a,
.language {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 12px;
  font-weight: 560;
  transition: color 160ms ease-out;
}

.header-actions,
.display-controls {
  display: flex;
  align-items: center;
}

.header-actions {
  justify-self: end;
  gap: 12px;
}

.display-controls {
  gap: 6px;
}

.control {
  min-height: 34px;
  padding: 0 11px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-primary);
  background: transparent;
  font: inherit;
  font-size: 11px;
  font-weight: 650;
  cursor: pointer;
}

.control:hover {
  border-color: var(--color-text-secondary);
}

.control:active {
  transform: translateY(1px);
}

.theme-control {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.theme-icon {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.language {
  justify-self: end;
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-primary);
}

.mobile-nav {
  display: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  align-items: center;
  gap: 72px;
  min-height: calc(100svh - 72px);
  padding: 104px 0;
}

.hero > div:first-child {
  max-width: 740px;
  margin-inline: 0;
  text-align: left;
}

.page-hero {
  min-height: 680px;
}

.eyebrow {
  color: var(--color-text-secondary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin: 24px 0 0;
  font-size: clamp(56px, 5.6vw, 82px);
  font-weight: 680;
  letter-spacing: -0.064em;
  line-height: 0.98;
  text-wrap: balance;
}

.page-hero h1 {
  max-width: 760px;
  font-size: clamp(52px, 5vw, 72px);
}

.lead {
  max-width: 780px;
  margin: 32px 0 0;
  color: var(--color-text-secondary);
  font-size: 20px;
  line-height: 1.7;
  text-wrap: pretty;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.hero .actions {
  justify-content: flex-start;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-primary);
  font-size: 14px;
  font-weight: 620;
  transition: border-color 160ms ease-out, color 160ms ease-out,
    background 160ms ease-out;
}

.button:hover {
  border-color: var(--color-text-secondary);
}

.button.primary {
  border-color: var(--color-text-primary);
  color: var(--color-background);
  background: var(--color-text-primary);
}

.button.primary:hover {
  border-color: var(--color-text-primary);
  background: var(--color-text-primary);
  color: var(--color-background);
}

.product-status {
  display: inline-flex;
  max-width: 100%;
  margin-top: 24px;
}

.trust-line {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  margin-top: 28px;
  color: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 560;
}

.trust-line::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-signal);
}

.hero-panel {
  width: 100%;
  margin: 0;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  background: var(--color-surface);
}

.panel-kicker {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  color: var(--color-text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
}

.status {
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 0 9px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-secondary);
  background: transparent;
  font-size: 11px;
  font-weight: 600;
}

.status.warning {
  border-color: var(--color-border);
  color: var(--color-text-secondary);
  background: transparent;
}

.status.success {
  border-color: rgba(69, 196, 134, 0.38);
  color: var(--color-signal);
  background: rgba(69, 196, 134, 0.07);
}

.workflow {
  display: grid;
  grid-template-columns: 1fr;
}

.workflow-row {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  min-height: 72px;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--color-border-subtle);
  text-align: left;
}

.workflow-row:first-child {
  border-top: 0;
}

.workflow-row span:first-child {
  color: var(--color-text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
}

.workflow-row strong {
  font-size: 15px;
  font-weight: 600;
}

.workflow-row .status {
  justify-self: end;
}

.section {
  padding: 136px 0;
  border-top: 1px solid var(--color-border-subtle);
}

.section-heading {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 96px;
  align-items: end;
  margin-bottom: 64px;
}

.section-heading h2,
.split h2,
.cta-panel h2 {
  max-width: 760px;
  margin-top: 18px;
  font-size: clamp(42px, 5vw, 70px);
  font-weight: 640;
  letter-spacing: -0.052em;
  line-height: 1.04;
  text-wrap: balance;
}

.section-heading > p,
.split > p {
  color: var(--color-text-secondary);
  font-size: 18px;
  line-height: 1.78;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
}

.grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  min-height: 230px;
  padding: 30px 0 20px;
  border-top: 1px solid var(--color-border);
  background: transparent;
}

.card-number {
  color: var(--color-text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.card h3 {
  margin-top: 46px;
  font-size: 22px;
  font-weight: 620;
  line-height: 1.3;
}

.card p {
  margin-top: 14px;
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.75;
}

.card .status {
  margin-top: 20px;
}

.card .actions {
  margin-top: 22px;
}

.progress-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 48px;
}

.progress-item {
  display: grid;
  gap: 12px;
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
}

.progress-item strong {
  font-size: 18px;
}

.progress-item p {
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.split {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 112px;
  align-items: start;
}

.split .lead {
  margin-inline: 0;
}

.list {
  display: grid;
  gap: 0;
  list-style: none;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.list li {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.list strong {
  color: var(--color-text-primary);
}

.sequence {
  display: grid;
  gap: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
  counter-reset: steps;
}

.sequence li {
  display: grid;
  grid-template-columns: 64px 1fr;
  align-items: center;
  min-height: 82px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
  list-style: none;
  counter-increment: steps;
}

.sequence li::before {
  content: "0" counter(steps);
  color: var(--color-text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
}

.proof {
  max-width: 980px;
  margin-inline: auto;
  padding: 0;
  color: var(--color-text-secondary);
  font-size: clamp(24px, 3.4vw, 44px);
  line-height: 1.35;
  text-align: center;
  text-wrap: balance;
}

.proof strong {
  color: var(--color-text-primary);
}

.cta-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 56px;
  padding: 72px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
}

.cta-panel p {
  max-width: 720px;
  margin-top: 20px;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.contact-section {
  scroll-margin-top: 92px;
}

.contact-panel {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 72px;
  padding: 64px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
}

.contact-panel h2 {
  margin-top: 18px;
  font-size: clamp(38px, 4.4vw, 60px);
  font-weight: 640;
  letter-spacing: -0.045em;
  line-height: 1.05;
}

.contact-panel > div > p:not(.eyebrow) {
  margin-top: 20px;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.contact-details {
  padding-top: 4px;
}

.contact-account {
  color: var(--color-text-primary) !important;
  font-size: 18px;
  font-weight: 620;
}

.copy-account-button {
  min-height: 48px;
  margin-top: 18px;
  color: var(--color-text-primary);
  background: transparent;
  font-family: inherit;
  cursor: pointer;
}

.copy-feedback {
  min-height: 24px;
  margin-top: 12px !important;
  color: var(--color-text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.copy-feedback[data-state="success"] {
  color: var(--color-signal);
}

.contact-steps {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  counter-reset: contact-steps;
  list-style: none;
}

.contact-steps li {
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: start;
  color: var(--color-text-secondary);
  line-height: 1.65;
  counter-increment: contact-steps;
}

.contact-steps li::before {
  content: counter(contact-steps, decimal-leading-zero);
  color: var(--color-text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  line-height: 1.8;
}

.contact-note {
  margin-top: 24px !important;
  padding-top: 20px;
  border-top: 1px solid var(--color-border-subtle);
  font-size: 13px;
}

.site-footer {
  padding: 40px 0 52px;
  border-top: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  font-size: 12px;
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 36px;
}

.footer-legal,
.footer-contact {
  display: grid;
  gap: 10px;
}

.footer-contact {
  justify-items: end;
  text-align: right;
}

.site-footer a:hover {
  color: var(--color-text-primary);
}

.mobile-home {
  display: none;
}

@media (min-width: 761px) {
  .mobile-home {
    display: none;
  }
}

@media (max-width: 1080px) {
  .header-inner {
    grid-template-columns: 1fr auto;
  }

  .desktop-nav,
  .language {
    display: none;
  }

  .mobile-nav {
    position: relative;
    display: block;
    justify-self: end;
  }

  .header-actions {
    gap: 8px;
  }

  .control {
    min-width: 44px;
    min-height: 44px;
  }

  .mobile-nav summary {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    padding: 0 13px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    color: var(--color-text-primary);
    cursor: pointer;
    list-style: none;
  }

  .mobile-nav summary::-webkit-details-marker {
    display: none;
  }

  .mobile-links {
    position: absolute;
    top: 48px;
    right: 0;
    display: grid;
    width: min(300px, calc(100vw - 36px));
    max-height: calc(100vh - 68px - env(safe-area-inset-bottom));
    max-height: calc(100svh - 68px - env(safe-area-inset-bottom));
    max-height: calc(100dvh - 68px - env(safe-area-inset-bottom));
    padding: 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    background: var(--color-surface-muted);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .mobile-links a {
    display: grid;
    min-height: 48px;
    align-content: center;
    gap: 2px;
    padding: 6px 12px;
    color: var(--color-text-secondary);
  }

  .mobile-links a[aria-current="page"] .nav-label {
    color: var(--color-text-primary);
  }

  .mobile-links a[href="https://os.xmlab.fun/"] .nav-label {
    color: var(--color-text-primary);
  }

  .mobile-nav-status {
    color: var(--color-text-muted);
    font-size: 12px;
    font-weight: 520;
    line-height: 1.35;
  }

  .mobile-nav-group-label {
    padding: 8px 12px 4px;
    color: var(--color-text-muted);
    font-size: 12px;
    font-weight: 620;
    letter-spacing: 0.08em;
  }

  .mobile-nav-divider {
    height: 1px;
    margin: 4px 8px;
    background: var(--color-border-subtle);
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .hero > div:first-child {
    max-width: 820px;
  }

  .hero-panel {
    max-width: 820px;
  }

  .section-heading,
  .split {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .grid.four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-panel {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 17px;
    line-height: 1.6;
  }

  body.home-page {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    overflow-x: hidden;
  }

  body.home-page .site-header {
    position: relative;
    padding-top: env(safe-area-inset-top);
  }

  body.home-page main {
    min-height: 0;
  }

  .desktop-home {
    display: none;
  }

  .mobile-home {
    display: flex;
    height: 100%;
    min-height: 0;
    align-items: center;
    padding: 8px 0;
  }

  .mobile-home-inner {
    display: grid;
    align-content: center;
    gap: 9px;
    padding: 2px 0;
  }

  .mobile-home h1 {
    max-width: 100%;
    margin-top: 0;
    font-size: clamp(38px, 10.2vw, 42px);
    line-height: 1.02;
    text-wrap: balance;
  }

  .mobile-home .eyebrow {
    font-size: 8.5px;
    letter-spacing: 0.11em;
  }

  .mobile-home-lead {
    color: var(--color-text-secondary);
    font-size: 17px;
    line-height: 1.6;
  }

  .mobile-home .trust-line {
    margin-top: 0;
    font-size: 14px;
  }

  .mobile-product-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .mobile-product-link {
    display: grid;
    min-width: 0;
    min-height: 72px;
    align-content: center;
    gap: 5px;
    padding: 7px 10px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background: var(--color-surface);
  }

  .mobile-product-link > span {
    overflow: hidden;
    font-size: 16px;
    font-weight: 620;
    line-height: 1.25;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .mobile-product-link .status {
    justify-self: start;
    min-height: 24px;
    padding: 0 6px;
    font-size: 14px;
    line-height: 1.2;
  }

  .mobile-home-cta {
    width: 100%;
    min-height: 48px;
    margin-top: 0;
    font-size: 17px;
  }

  body.home-page .site-footer {
    padding: 8px 0 calc(8px + env(safe-area-inset-bottom));
    font-size: 9.5px;
    line-height: 1.25;
  }

  body.home-page .footer-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
  }

  body.home-page .footer-legal,
  body.home-page .footer-contact {
    gap: 2px;
  }

  body.home-page .footer-contact {
    justify-items: end;
    text-align: right;
  }

  .shell {
    width: min(calc(100% - 36px), var(--layout-max));
  }

  .header-inner {
    min-height: 58px;
  }

  .brand {
    font-size: 14px;
  }

  .brand img {
    width: 28px;
    height: 28px;
    flex-basis: 28px;
  }

  .hero,
  .page-hero {
    min-height: auto;
    padding: 80px 0 72px;
  }

  h1,
  .page-hero h1 {
    margin-top: 18px;
    font-size: clamp(42px, 13.2vw, 54px);
    line-height: 1.02;
  }

  .lead {
    margin-top: 26px;
    font-size: 17px;
    line-height: 1.68;
  }

  .section-heading > p,
  .split > p,
  .card p,
  .progress-item p,
  .list li,
  .sequence li,
  .contact-panel > div > p:not(.eyebrow),
  .contact-steps li {
    font-size: 17px;
    line-height: 1.65;
  }

  .status {
    font-size: 14px;
  }

  .copy-account-button {
    font-size: 17px;
  }

  .actions {
    display: grid;
    width: 100%;
    margin-top: 30px;
  }

  .button {
    width: 100%;
    min-height: 50px;
    font-size: 17px;
  }

  .trust-line {
    margin-top: 24px;
  }

  .hero-panel {
    margin-top: 52px;
  }

  .workflow-row {
    grid-template-columns: 32px 1fr auto;
    min-height: 68px;
    align-items: center;
    padding: 14px 0;
    border-top: 1px solid var(--color-border-subtle);
    border-left: 0;
  }

  .workflow-row strong {
    font-size: 14px;
  }

  .section {
    padding: 88px 0;
  }

  .section-heading {
    margin-bottom: 42px;
  }

  .section-heading h2,
  .split h2,
  .cta-panel h2 {
    font-size: 40px;
    line-height: 1.08;
  }

  .section-heading > p,
  .split > p {
    font-size: 17px;
  }

  .grid,
  .grid.two,
  .grid.four,
  .progress-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .card {
    min-height: auto;
    padding: 26px 0 32px;
  }

  .card h3 {
    margin-top: 30px;
  }

  .cta-panel {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 36px 24px;
  }

  .contact-panel {
    padding: 36px 24px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
  }

  .footer-contact {
    justify-items: start;
    text-align: left;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}