:root {
  color-scheme: light;
  --background: #f5f5f7;
  --surface: #ffffff;
  --surface-muted: #f0f1f2;
  --surface-strong: #1d1d1f;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --border: #dedee3;
  --border-strong: #b8b8bd;
  --accent: #167858;
  --accent-hover: #0f6247;
  --accent-soft: #dcefe7;
  --accent-text: #f4fff9;
  --contrast-surface: #1d1d1f;
  --contrast-text: #f5f5f7;
  --contrast-muted: #b8b8bd;
  --header: rgba(255, 255, 255, 0.88);
  --shadow: 0 20px 60px rgba(29, 29, 31, 0.1);
  --focus: #159269;
}

[data-theme='dark'] {
  color-scheme: dark;
  --background: #000000;
  --surface: #1c1c1e;
  --surface-muted: #2c2c2e;
  --surface-strong: #f5f5f7;
  --text: #f5f5f7;
  --text-muted: #a1a1a6;
  --border: #38383a;
  --border-strong: #545458;
  --accent: #62c69b;
  --accent-hover: #7bd5ad;
  --accent-soft: #1b3c2e;
  --accent-text: #0d1b14;
  --contrast-surface: #000000;
  --contrast-text: #f5f5f7;
  --contrast-muted: #a1a1a6;
  --header: rgba(0, 0, 0, 0.88);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  --focus: #7bd5ad;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

button {
  color: inherit;
  font: inherit;
}

img,
svg {
  display: block;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 6px;
  background: var(--surface-strong);
  color: var(--background);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

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

.section-shell,
.nav-shell {
  width: min(1200px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: var(--header);
  backdrop-filter: blur(18px);
}

.nav-shell {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 70px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 11px;
  min-width: 0;
}

.brand-mark {
  flex: 0 0 auto;
  border-radius: 8px;
}

.brand-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  line-height: 1.2;
}

.brand-copy strong {
  font-size: 15px;
  font-weight: 720;
}

.brand-copy small {
  margin-top: 3px;
  color: var(--text-muted);
  font-size: 11px;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.desktop-nav a,
.footer-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  transition: color 160ms ease, background-color 160ms ease;
}

.desktop-nav a {
  padding: 7px 12px;
  border-radius: 6px;
}

.desktop-nav a:hover,
.footer-links a:hover {
  color: var(--text);
}

.desktop-nav a:hover {
  background: var(--surface-muted);
}

.nav-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 8px;
}

.button,
.icon-button,
.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 7px;
  cursor: pointer;
  font-weight: 680;
  white-space: nowrap;
  transition:
    transform 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

.button {
  min-height: 38px;
  padding: 0 15px;
  font-size: 14px;
}

.button svg,
.icon-button svg,
.copy-button svg,
.hero-note svg,
.strip-inner svg,
.capability-item > svg {
  width: 18px;
  height: 18px;
  stroke-width: 1.8;
}

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

.button-primary:hover {
  background: var(--accent-hover);
}

.button-quiet {
  color: var(--text);
}

.button-quiet:hover {
  background: var(--surface-muted);
}

.button-outline {
  border-color: var(--border-strong);
  background: var(--surface);
  color: var(--text);
}

.button-outline:hover {
  border-color: var(--text-muted);
  background: var(--surface-muted);
}

.button-large {
  min-height: 48px;
  gap: 9px;
  padding-inline: 20px;
  font-size: 15px;
}

.button:active,
.icon-button:active,
.copy-button:active {
  transform: translateY(1px);
}

.icon-button {
  width: 38px;
  height: 38px;
  padding: 0;
  border-color: var(--border);
  background: transparent;
}

.icon-button:hover {
  background: var(--surface-muted);
}

.mobile-menu-button,
.mobile-menu {
  display: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(480px, 1.1fr);
  align-items: center;
  min-height: calc(100svh - 142px);
  padding-block: 56px 52px;
  gap: 56px;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 20px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 650;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px var(--accent-soft);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 680px;
  margin-bottom: 24px;
  font-size: 64px;
  font-weight: 780;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 520px;
  margin-bottom: 30px;
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-note {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 0;
  color: var(--text-muted);
  font-size: 13px;
}

.hero-note svg {
  color: var(--accent);
}

.relay-visual {
  min-width: 0;
  margin: 0;
}

.relay-visual figcaption {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.relay-canvas {
  position: relative;
  width: 100%;
  aspect-ratio: 600 / 460;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background-color: var(--surface);
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 44px 44px;
  box-shadow: var(--shadow);
}

.relay-canvas::after {
  position: absolute;
  inset: 0;
  background: var(--surface);
  content: '';
  opacity: 0.68;
  pointer-events: none;
}

.route-lines {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
}

.route-base,
.route-flow {
  fill: none;
  stroke-linecap: round;
  stroke-width: 2;
}

.route-base {
  stroke: var(--border-strong);
}

.route-flow {
  stroke: var(--accent);
  stroke-dasharray: 2 18;
  stroke-width: 4;
  animation: route-flow 2.8s linear infinite;
}

.route-delay-1 {
  animation-delay: -0.4s;
}

.route-delay-2 {
  animation-delay: -1.1s;
}

.route-delay-3 {
  animation-delay: -1.8s;
}

.relay-node,
.gateway-node,
.route-badge {
  position: absolute;
  z-index: 3;
}

.relay-node {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 132px;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(26, 48, 39, 0.08);
}

.relay-node small,
.relay-node strong {
  display: block;
  white-space: nowrap;
}

.relay-node small {
  color: var(--text-muted);
  font-size: 9px;
}

.relay-node strong {
  margin-top: 1px;
  font-size: 12px;
}

.node-icon,
.model-glyph {
  display: grid;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 6px;
  background: var(--surface-muted);
  color: var(--accent);
}

.node-icon svg {
  width: 17px;
  height: 17px;
}

.model-glyph {
  font-size: 12px;
  font-weight: 800;
}

.client-node {
  top: 43%;
  left: 3.5%;
}

.gateway-node {
  top: 50%;
  left: 50%;
  display: flex;
  width: 126px;
  min-height: 148px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 18px 50px rgba(22, 120, 88, 0.16);
  transform: translate(-50%, -50%);
}

.gateway-node img {
  margin-bottom: 10px;
  border-radius: 8px;
}

.gateway-node strong {
  font-size: 14px;
}

.gateway-node span {
  color: var(--text-muted);
  font-size: 11px;
}

.gateway-node em {
  margin-top: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 9px;
  font-style: normal;
  font-weight: 750;
}

.model-node {
  right: 3.5%;
}

.model-one {
  top: 10%;
}

.model-two {
  top: 43%;
}

.model-three {
  bottom: 10%;
}

.route-badge {
  bottom: 7%;
  left: 30%;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 700;
}

.route-badge svg {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

.capability-strip {
  border-block: 1px solid var(--border);
  background: var(--surface);
}

.strip-inner {
  display: grid;
  width: min(1200px, calc(100% - 48px));
  min-height: 72px;
  margin-inline: auto;
  grid-template-columns: repeat(4, 1fr);
  align-items: center;
}

.strip-inner span {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-width: 0;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 650;
  white-space: nowrap;
}

.strip-inner span + span {
  border-left: 1px solid var(--border);
}

.strip-inner svg {
  color: var(--accent);
}

.connection-section {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(480px, 1.2fr);
  align-items: center;
  padding-block: 120px;
  gap: 88px;
}

h2 {
  margin-bottom: 18px;
  font-size: 40px;
  font-weight: 760;
  line-height: 1.2;
  letter-spacing: 0;
}

.connection-copy > p,
.control-heading p,
.final-cta p {
  max-width: 620px;
  color: var(--text-muted);
  line-height: 1.75;
}

.steps {
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
}

.steps li {
  display: grid;
  grid-template-columns: 42px 1fr;
  padding: 17px 0;
  border-top: 1px solid var(--border);
  gap: 12px;
}

.steps li:last-child {
  border-bottom: 1px solid var(--border);
}

.steps li > span {
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  font-weight: 750;
}

.steps strong {
  font-size: 15px;
}

.steps p {
  margin: 2px 0 0;
  color: var(--text-muted);
  font-size: 13px;
}

.code-panel {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--contrast-surface);
  color: var(--contrast-text);
  box-shadow: var(--shadow);
}

.code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
  padding-inline: 18px;
  border-bottom: 1px solid color-mix(in srgb, var(--contrast-text) 14%, transparent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

.copy-button {
  gap: 6px;
  min-height: 32px;
  padding: 0 9px;
  border-color: color-mix(in srgb, var(--contrast-text) 18%, transparent);
  background: transparent;
  color: inherit;
  font-size: 11px;
}

.copy-button:hover {
  background: color-mix(in srgb, var(--contrast-text) 10%, transparent);
}

.copy-button svg {
  width: 14px;
  height: 14px;
}

pre {
  margin: 0;
  padding: 26px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.85;
}

.code-muted {
  color: color-mix(in srgb, var(--accent) 80%, var(--contrast-text));
}

.code-value {
  color: color-mix(in srgb, var(--contrast-text) 78%, var(--accent));
}

.control-section {
  padding-block: 112px;
  border-block: 1px solid var(--border);
  background: var(--surface-muted);
}

.control-inner {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.25fr);
  align-items: start;
  gap: 72px;
}

.control-heading {
  position: sticky;
  top: 112px;
}

.capability-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 14px;
}

.capability-item {
  min-height: 210px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.capability-item:nth-child(2),
.capability-item:nth-child(3) {
  min-height: 185px;
}

.capability-item > svg {
  width: 24px;
  height: 24px;
  margin-bottom: 46px;
  color: var(--accent);
}

.capability-item h3 {
  margin-bottom: 8px;
  font-size: 18px;
  line-height: 1.35;
}

.capability-item p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.capability-primary {
  background: var(--accent-soft);
}

.capability-dark {
  background: var(--contrast-surface);
  color: var(--contrast-text);
}

.capability-dark p {
  color: var(--contrast-muted);
}

.capability-dark > svg {
  color: var(--accent);
}

.final-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 104px;
  gap: 40px;
}

.final-cta h2 {
  margin-bottom: 10px;
}

.final-cta p {
  margin-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 112px;
  gap: 32px;
}

.footer-inner > p {
  margin: 0;
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: flex-end;
  gap: 22px;
}

@keyframes route-flow {
  to {
    stroke-dashoffset: -40;
  }
}

@media (max-width: 1020px) {
  .nav-shell {
    grid-template-columns: 1fr auto;
  }

  .desktop-nav {
    display: none;
  }

  .hero {
    grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
    gap: 32px;
  }

  h1 {
    font-size: 52px;
  }

  .connection-section {
    grid-template-columns: 1fr 1.15fr;
    gap: 48px;
  }
}

@media (max-width: 767px) {
  .section-shell,
  .nav-shell,
  .strip-inner {
    width: min(100% - 32px, 600px);
  }

  .site-header {
    backdrop-filter: blur(14px);
  }

  .nav-shell {
    min-height: 64px;
    gap: 12px;
  }

  .brand-copy small {
    display: none;
  }

  .desktop-action {
    display: none;
  }

  .mobile-menu-button {
    display: inline-flex;
  }

  .mobile-menu {
    width: min(100% - 32px, 600px);
    margin: 0 auto;
    padding: 4px 0 18px;
  }

  .mobile-menu[hidden] {
    display: none;
  }

  .mobile-menu:not([hidden]) {
    display: grid;
  }

  .mobile-menu > a {
    padding: 12px 4px;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 650;
  }

  .mobile-auth {
    display: grid;
    grid-template-columns: 1fr 1fr;
    margin-top: 14px;
    gap: 10px;
  }

  .mobile-auth .button-quiet {
    border-color: var(--border);
  }

  .hero {
    display: flex;
    min-height: calc(100svh - 104px);
    flex-direction: column;
    align-items: stretch;
    padding-block: 34px 28px;
    gap: 26px;
  }

  .eyebrow {
    margin-bottom: 14px;
    font-size: 12px;
  }

  h1 {
    margin-bottom: 16px;
    font-size: 43px;
    line-height: 1.12;
  }

  .hero-lead {
    margin-bottom: 22px;
    font-size: 16px;
    line-height: 1.7;
  }

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

  .button-large {
    padding-inline: 14px;
  }

  .hero-note {
    margin-top: 12px;
  }

  .relay-canvas {
    aspect-ratio: 600 / 430;
  }

  .relay-node {
    min-width: 112px;
    padding: 8px;
  }

  .relay-node small {
    display: none;
  }

  .relay-node strong {
    font-size: 10px;
  }

  .node-icon,
  .model-glyph {
    width: 26px;
    height: 26px;
  }

  .gateway-node {
    width: 104px;
    min-height: 118px;
  }

  .gateway-node img {
    width: 42px;
    height: 42px;
    margin-bottom: 6px;
  }

  .gateway-node strong {
    font-size: 12px;
  }

  .gateway-node em,
  .route-badge {
    display: none;
  }

  .strip-inner {
    grid-template-columns: 1fr 1fr;
    padding-block: 10px;
  }

  .strip-inner span {
    min-height: 42px;
    justify-content: flex-start;
    padding-left: 12px;
    font-size: 12px;
  }

  .strip-inner span + span {
    border-left: 0;
  }

  .strip-inner span:nth-child(even) {
    border-left: 1px solid var(--border);
  }

  .strip-inner span:nth-child(n + 3) {
    border-top: 1px solid var(--border);
  }

  .connection-section,
  .control-inner {
    grid-template-columns: 1fr;
  }

  .connection-section {
    padding-block: 80px;
    gap: 46px;
  }

  h2 {
    font-size: 32px;
  }

  .code-panel {
    width: 100%;
  }

  pre {
    padding: 20px;
    font-size: 11px;
  }

  .control-section {
    padding-block: 78px;
  }

  .control-inner {
    gap: 42px;
  }

  .control-heading {
    position: static;
  }

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

  .capability-item,
  .capability-item:nth-child(2),
  .capability-item:nth-child(3) {
    min-height: 174px;
  }

  .capability-item > svg {
    margin-bottom: 32px;
  }

  .final-cta {
    align-items: stretch;
    flex-direction: column;
    padding-block: 78px;
    gap: 26px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    padding-block: 34px;
    gap: 20px;
  }

  .footer-brand {
    justify-self: center;
  }

  .footer-inner > p {
    order: 3;
  }

  .footer-links {
    justify-content: center;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--background);
    backdrop-filter: none;
  }
}