:root {
  --bg: #FBFBFB;
  --panel: #FFFFFF;
  --panel-2: #F3F3F3;
  --border: #E2E2E2;
  --border-strong: #CFCFD4;
  --rail: #E4E4E4;
  --accent: #0B36F4;
  --accent-dark: #0726B8;
  --on-accent: #FFFFFF;
  --text: #141414;
  --muted: #5F5F63;
  --particle: #C4C4C9;
  --dot: #D8D8DC;
  --success: #1C8A4A;
  --warn: #B7791F;
  --error: #C62828;
  --warn-ink: #795015;
  --clear: transparent;
  --glow-start: rgb(11 54 244 / .30);
  --glow-end: rgb(11 54 244 / 0);
  --veil: rgb(20 20 20 / .20);
  --code-shadow: rgb(20 20 20 / .04);

  --font-display: "Inter","Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  --font-body: "Inter","Noto Sans SC",-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono: "JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --weight-body: 400;
  --weight-medium: 500;
  --weight-bold: 600;
  --weight-heavy: 800;
  --radius: 0;
  --radius-circle: 50%;
  --wrap: 1200px;
  --header-width: 1280px;
  --reading-width: 780px;
  --gutter: 48px;
  --bar-h: 72px;
  --band-h: 48px;
  --tick: 8px;
  --tick-gap: -5px;
  --dev-scale: 1;
  --dev-h: 680px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 72px;
  --space-7: 120px;
  --speed: .18s;
  --reveal-speed: .5s;
  --tab-cycle: 6s;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: var(--weight-body) 16px/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
img, svg { vertical-align: middle; }
img { max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; border-radius: var(--radius); }
button, summary { cursor: pointer; }
button { color: var(--text); }
a { color: var(--accent); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--radius); }
::selection { background: var(--accent); color: var(--on-accent); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-heavy);
  line-height: 1.2;
  letter-spacing: -.02em;
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: clamp(34px,3.35vw,48px); line-height: 1.14; }
h2 { font-size: clamp(26px,2.4vw,32px); }
h3 { font-size: 22px; }
p { margin-block: 0 1.2em; }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; font-size: .9em; }
pre {
  max-width: 100%;
  overflow-x: auto;
  padding: var(--space-3);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
  line-height: 1.75;
  tab-size: 2;
}
pre code { font-size: inherit; overflow-wrap: normal; white-space: pre; }
svg, .icon, .status-dot { flex-shrink: 0; }
:where(main, section, article, aside, nav, div) { min-width: 0; }
:where(h2, h3, section[id], article[id]) { scroll-margin-top: var(--space-3); }
.keep { white-space: nowrap; }
.hl { color: var(--accent); }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; left: var(--space-2); top: var(--space-2); z-index: 100;
  padding: var(--space-2);
  background: var(--panel); color: var(--accent);
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }
.page { position: relative; overflow-x: clip; min-height: 100vh; }
.rails { position: absolute; inset: 0; z-index: 1; pointer-events: none; }
.rails::before, .rails::after {
  content: ""; position: absolute; top: 0; bottom: 0;
  border-left: 1px solid var(--rail);
}
.rails::before { left: max(16px,calc(50% - var(--wrap) / 2)); }
.rails::after { right: max(16px,calc(50% - var(--wrap) / 2)); }
.wrap {
  width: min(var(--wrap),calc(100% - 32px));
  margin-inline: auto; padding-inline: var(--gutter);
}
.section { position: relative; padding-top: var(--space-6); padding-bottom: var(--space-6); }
.section > .wrap { position: relative; z-index: 2; }
.section + .section { border-top: 1px solid var(--border); }
.reading { max-width: var(--reading-width); margin-inline: auto; }
.prose { overflow-wrap: break-word; }
.prose h2 { margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }
.prose li + li { margin-top: var(--space-1); }
.prose :where(ul, ol) { padding-left: 1.5em; }
.prose blockquote { margin-inline: 0; }
.grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: var(--space-3); }
.grid > *, .hero-grid > *, .footer-grid > * { min-width: 0; }
.panel, .card {
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel); color: var(--text);
}
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.eyebrow {
  margin: 0 0 24px;
  font: var(--weight-medium) 12px/1.6 var(--font-mono);
  letter-spacing: .18em; text-transform: uppercase; color: var(--accent);
}
.eyebrow--muted { color: var(--muted); }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; margin-top: 34px; }
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center;
  gap: 10px; min-height: 52px; padding: 12px 28px;
  font: var(--weight-bold) 16px/1.3 var(--font-body);
  letter-spacing: .01em; text-align: center; text-decoration: none;
  border-radius: var(--radius);
  transition: background-color var(--speed),border-color var(--speed),color var(--speed);
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--accent); color: var(--on-accent); border: 1px solid var(--accent); }
.btn-primary:hover, .btn-primary.is-hover { background: var(--accent-dark); color: var(--on-accent); border-color: var(--accent-dark); }
.btn-primary::before, .btn-primary::after, .btn-ticks::before, .btn-ticks::after {
  content: ""; position: absolute; width: var(--tick); height: var(--tick);
  border: 0 solid var(--accent); pointer-events: none; transition: transform .2s ease;
}
.btn-ticks { position: absolute; inset: 0; pointer-events: none; }
.btn-primary::before { top: var(--tick-gap); left: var(--tick-gap); border-top-width: 1px; border-left-width: 1px; }
.btn-primary::after { bottom: var(--tick-gap); right: var(--tick-gap); border-bottom-width: 1px; border-right-width: 1px; }
.btn-ticks::before { top: var(--tick-gap); right: var(--tick-gap); border-top-width: 1px; border-right-width: 1px; }
.btn-ticks::after { bottom: var(--tick-gap); left: var(--tick-gap); border-bottom-width: 1px; border-left-width: 1px; }
.btn-primary:hover::before { transform: translate(-2px,-2px); }
.btn-primary:hover::after { transform: translate(2px,2px); }
.btn-primary:hover .btn-ticks::before { transform: translate(2px,-2px); }
.btn-primary:hover .btn-ticks::after { transform: translate(-2px,2px); }
.btn-ghost { background: var(--panel); color: var(--text); border: 1px solid var(--border-strong); }
.btn-ghost:hover, .btn-ghost.is-hover { border-color: var(--text); }
.btn-ghost .arrow { color: var(--accent); }
.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--panel-2); color: var(--muted); border: 1px solid var(--border);
  cursor: not-allowed;
}
.btn:disabled::before, .btn:disabled::after { content: none; }
.is-focus { outline: 2px solid var(--accent); outline-offset: 3px; }
#site-header { position: relative; z-index: 60; }
.topbar { background: var(--panel); color: var(--text); border-bottom: 1px solid var(--border); }
.topbar-in {
  position: relative; z-index: 2; height: var(--bar-h);
  display: flex; align-items: center; gap: 52px;
}
.header-shell {
  width: 100%; max-width: min(100%,calc(var(--header-width) + var(--gutter) * 2));
  margin-inline: auto; padding-inline: var(--gutter);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0;
  text-decoration: none; color: var(--text);
  font: var(--weight-heavy) 18px/1.6 var(--font-display);
  letter-spacing: -.01em; white-space: nowrap;
}
.brand-mark { width: 26px; height: 26px; display: block; flex-shrink: 0; }
.desktop-nav { min-width: 0; }
.nav {
  display: flex; align-items: center; list-style: none;
  margin: 0; padding: 0; gap: 34px;
}
.nav a {
  text-decoration: none; color: var(--muted); font-size: 15px;
  font-weight: var(--weight-medium); letter-spacing: .005em; white-space: nowrap;
  transition: color var(--speed);
}
.nav a:hover { color: var(--text); }
.nav a[aria-current="page"] { color: var(--text); font-weight: 700; }
.tools { margin-left: auto; display: flex; align-items: center; gap: var(--space-1); flex-shrink: 0; }
.language { position: relative; }
.lang {
  appearance: none; border: 1px solid var(--border); background: var(--panel); color: var(--text);
  height: 40px; padding-inline: 16px;
  font: var(--weight-medium) 14px/1 var(--font-body);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  cursor: pointer; border-radius: var(--radius); white-space: nowrap;
}
.lang:hover { border-color: var(--border-strong); }
.lang-caret { color: var(--muted); font-size: 11px; }
.lang-short { display: none; }
.language-menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 180px;
  margin: 0; padding: 8px; list-style: none;
  border: 1px solid var(--border); background: var(--panel); color: var(--text); z-index: 5;
}
.language-menu a, .mobile-drawer a {
  display: flex; align-items: center; width: 100%; min-height: 44px;
  padding: 10px 16px; color: var(--text); text-decoration: none;
}
.language-menu a:hover, .mobile-drawer a:hover { background: var(--panel-2); color: var(--accent); }
.language-menu a[aria-current="true"], .mobile-drawer a[aria-current] { color: var(--accent); }
.menu-toggle {
  display: none; align-items: center; justify-content: center;
  min-width: 44px; min-height: 44px; padding: 8px;
  background: var(--panel); color: var(--text); border: 1px solid var(--border);
}
.menu-toggle svg { width: 20px; height: 20px; }
.mobile-drawer { display: none; }
.nav-veil { position: fixed; inset: var(--bar-h) 0 0; background: var(--veil); color: var(--text); z-index: 1; border: 0; }
.hero {
  min-height: calc(100vh - var(--bar-h) - var(--band-h) - 16px);
  min-height: calc(100svh - var(--bar-h) - var(--band-h) - 16px);
  display: grid; align-content: center; padding-block: 32px; overflow-x: clip;
}
.hero-grid {
  position: relative; z-index: 2; display: grid;
  grid-template-columns: minmax(0,45fr) minmax(0,55fr); align-items: center;
}
.hero-copy { padding-block: 8px; }
.hero h1 {
  margin: 0; font-size: clamp(28px,3.35vw,48px);
  line-height: 1.14; letter-spacing: -.02em; color: var(--text);
}
.h1-line { display: block; }
.lede { margin: 34px 0 0; max-width: 28em; font-size: 17px; line-height: 1.75; color: var(--muted); }
.lede strong { color: var(--accent); font-weight: var(--weight-bold); }
.facts { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 0; padding: 0; list-style: none; }
.fact {
  display: inline-flex; align-items: center; gap: 8px; min-height: 30px; padding: 6px 12px;
  background: var(--panel); color: var(--text); border: 1px solid var(--border);
  border-radius: var(--radius); font: 12px/1.3 var(--font-mono); max-width: 100%;
}
.fact-k { color: var(--muted); letter-spacing: .06em; }
.fact-v { color: var(--text); overflow-wrap: anywhere; }
.platforms { margin-top: 36px; }
.platforms-cap { margin: 0 0 10px; font: 11px/1.6 var(--font-mono); letter-spacing: .18em; text-transform: uppercase; color: var(--muted); }
.plat-row { display: flex; flex-wrap: wrap; margin: 0; padding: 0; list-style: none; }
.plat-row li + li { margin-left: -1px; }
.plat {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding-inline: 15px; position: relative;
  background: var(--panel); color: var(--muted); border: 1px solid var(--border);
  border-radius: var(--radius); text-decoration: none; font-size: 14px; font-weight: var(--weight-medium);
  white-space: nowrap; transition: color var(--speed),border-color var(--speed);
}
.plat svg { width: 15px; height: 15px; }
.plat:hover { color: var(--accent); border-color: var(--accent); z-index: 1; }
.device { position: relative; height: var(--dev-h); pointer-events: none; }
.stage {
  position: absolute; left: 50%; top: 50%; width: 700px; height: 680px;
  margin: -340px 0 0 -335px; transform: scale(var(--dev-scale)); transform-origin: 50% 50%;
}
.orbit-svg { position: absolute; inset: 0; width: 700px; height: 680px; overflow: visible; display: block; }
.ring { fill: var(--clear); stroke: var(--accent); stroke-width: 1; }
.ring--outer { stroke-opacity: .22; transform-origin: 350px 340px; animation: orbit-turn 120s linear infinite; }
.ring--mid { stroke-opacity: .3; }
.ring--inner { stroke-opacity: .4; }
.glow-0 { stop-color: var(--accent); stop-opacity: .3; }
.glow-1 { stop-color: var(--accent); stop-opacity: 0; }
.glow { fill: url(#nodeGlow); animation: orbit-breathe 5s ease-in-out infinite alternate; }
.glow--t1 { opacity: .9; }
.glow--t2 { opacity: .6; animation-duration: 6s; animation-delay: -2s; }
.glow--t3 { opacity: .35; animation-duration: 7s; animation-delay: -4s; }
.node { fill: var(--accent); }
.node--t2 { fill-opacity: .8; }
.node--t3 { fill-opacity: .5; }
.pt { fill: var(--particle); }
.pt--dim { fill-opacity: .55; }
.core-ring { fill: var(--panel); stroke: var(--accent); stroke-opacity: .45; stroke-width: 1; }
.tag {
  font: 11px var(--font-mono); letter-spacing: .02em; fill: var(--muted);
  stroke: var(--bg); stroke-width: 4px; stroke-linejoin: round; paint-order: stroke;
}
.tag--note { letter-spacing: .06em; }
.packet {
  position: absolute; left: 550px; top: 340px; width: 40px; height: 40px;
  transform: translate(-50%,-50%);
  background: radial-gradient(circle,var(--glow-start) 0,var(--glow-end) 70%);
  color: var(--accent); pointer-events: none;
}
.packet::after {
  content: ""; position: absolute; left: 50%; top: 50%;
  width: 9px; height: 9px; margin: -4.5px 0 0 -4.5px;
  background: var(--accent); color: var(--on-accent);
  border: 2px solid var(--panel); border-radius: var(--radius-circle);
}
@supports (offset-path: path("M0 0")) {
  .packet {
    left: 0; top: 0; transform: none;
    offset-path: path("M550,340 C550,524 534,540 350,540 C166,540 150,524 150,340 C150,156 166,140 350,140 C534,140 550,156 550,340 Z");
    offset-anchor: 50% 50%; offset-rotate: 0deg; offset-distance: 0%;
    animation: patrol 18s linear infinite;
  }
}
@keyframes patrol { to { offset-distance: 100%; } }
@keyframes orbit-turn { to { transform: rotate(360deg); } }
@keyframes orbit-breathe { from { opacity: .35; } to { opacity: .9; } }
.band { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.band-in {
  height: var(--band-h);
  background-color: var(--bg); color: var(--text);
  background-image: radial-gradient(circle,var(--dot) .9px,var(--clear) 1.1px);
  background-size: 8px 8px; background-position: 4px 4px;
}
.site-footer { position: relative; z-index: 2; border-top: 1px solid var(--border); background: var(--panel); color: var(--text); }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1.3fr; gap: var(--space-5); }
.footer-brand p { margin-top: var(--space-3); color: var(--muted); max-width: 25em; }
.site-footer h2 { font-size: 15px; margin: 0 0 var(--space-2); }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-links a, .footer-languages a, .footer-legal a { color: var(--muted); text-decoration: none; }
.footer-links a:hover, .footer-languages a:hover, .footer-legal a:hover { color: var(--accent); }
.footer-languages, .footer-legal { display: flex; flex-wrap: wrap; gap: 12px 24px; }
.footer-bottom { margin-top: var(--space-5); padding-top: var(--space-3); border-top: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.footer-bottom p { margin-top: var(--space-3); }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(16px); }
html.reveal-ready .reveal { transition: opacity var(--reveal-speed),transform var(--reveal-speed); }
@media (max-width: 1400px) {
  .header-shell .topbar-in { gap: 28px; }
  .header-shell.topbar-in { gap: 28px; }
  .header-shell .nav { gap: 24px; }
}
@media (max-width: 1279px) {
  .desktop-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .tools { margin-left: auto; }
  .mobile-drawer:not([hidden]) {
    display: block; position: absolute; top: var(--bar-h); left: 0; right: 0; z-index: 3;
    padding: 16px var(--gutter) 24px; border-bottom: 1px solid var(--border);
    background: var(--panel); color: var(--text);
    max-height: calc(100vh - var(--bar-h)); max-height: calc(100dvh - var(--bar-h));
    overflow-y: auto; overscroll-behavior: contain;
  }
  .mobile-drawer ul { list-style: none; padding: 0; margin: 0; }
  .mobile-drawer li + li { border-top: 1px solid var(--border); }
  .drawer-languages { margin-top: var(--space-3); padding-top: var(--space-2); border-top: 1px solid var(--border); }
}
@media (max-width: 1279px) { :root { --dev-scale: .84; --dev-h: 590px; } }
@media (max-width: 1080px) {
  :root { --gutter: 32px; --dev-scale: .72; --dev-h: 510px; }
  .topbar-in { gap: 32px; }
  .nav { gap: 22px; }
}
@media (max-width: 899px) {
  :root { --gutter: 20px; --dev-scale: .52; --dev-h: 370px; }
  .hero { min-height: 0; padding-block: 40px 24px; }
  .hero-grid { grid-template-columns: minmax(0,1fr); }
  .stage { margin-left: -350px; }
  .lede { font-size: 16px; }
  .grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .footer-grid { grid-template-columns: minmax(0,1fr) minmax(0,1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .preview-header .topbar-in { height: auto; flex-wrap: wrap; row-gap: 0; padding-block: 14px 0; }
  .preview-header .nav { order: 3; width: 100%; overflow-x: auto; gap: 24px; padding-block: 14px; scrollbar-width: none; }
}
@media (max-width: 768px) {
  h1, .hero h1 { font-size: clamp(24px,5vw,30px); }
}
@media (max-width: 640px) {
  :root { --space-6: 48px; --space-7: 72px; }
  .tilt, [data-tilt] { transform: none !important; }
  .grid, .footer-grid { grid-template-columns: minmax(0,1fr); }
  .panel, .card { padding: var(--space-3); }
  .header-shell { padding-inline: 16px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .lang { padding-inline: 12px; }
  .brand { font-size: 16px; gap: 8px; }
  .facts { flex-direction: row; flex-wrap: wrap; }
}
@media (max-width: 480px) {
  :root { --dev-scale: .46; --dev-h: 330px; }
  .btn { min-height: 48px; padding: 12px 22px; font-size: 15px; }
  .plat { padding-inline: 11px; font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}
@media print {
  .tools, .mobile-drawer, .nav-veil, .dl-fab, .device { display: none !important; }
  html.reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}