:root {
  color-scheme: dark;
  --bg: #000000;
  --bg-panel: #0B0B0C;
  --bg-panel-2: #151517;
  --bg-panel-3: #1D1D20;
  --border: #232326;
  --border-strong: #303035;
  --accent: #12A8FF;
  --accent-hi: #3DB8FF;
  --accent-dark: #0A6FC2;
  --accent-rgb: 18, 168, 255;
  --text: #F2F2F3;
  --text-muted: #8D8D93;
  --text-faint: #5B5B61;
  --white: #FFFFFF;
  --on-accent: #00121E;
  --success: #33C47A;
  --warn: #E2A631;
  --error: #EF524E;
  --canvas: #02060D;
  --panel-rgb: 11, 11, 12;
  --shade-rgb: 0, 0, 0;
  --hair-rgb: 255, 255, 255;
  --clear: transparent;
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-strong: 600;
  --size-body: 15px;
  --size-small: 13px;
  --size-micro: 12px;
  --size-h1: clamp(34px, 2.2vw + 16px, 48px);
  --size-h2: clamp(26px, 3vw, 38px);
  --size-h3: 22px;
  --r-window: 28px;
  --r-panel: 26px;
  --r-card: 16px;
  --r-canvas: 14px;
  --r-ctl: 12px;
  --r-tag: 6px;
  --r-soft: 18px;
  --r-mobile: 22px;
  --r-circle: 50%;
  --r-pill: 999px;
  --gutter: 24px;
  --content-width: 1200px;
  --reading-width: 800px;
  --header-width: 1280px;
  --nav-h: 64px;
  --dev-h: clamp(450px, 50svh, 600px);
  --section-space: clamp(56px, 7vw, 104px);
  --ease: cubic-bezier(.2, .7, .2, 1);
  --duration: .2s;
  --feature-duration: 8s;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; scroll-padding-top: 24px; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
img, svg, video { max-width: 100%; vertical-align: middle; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, input, select, textarea { max-width: 100%; }
button svg, a svg, .facts-dot { flex-shrink: 0; }
button { color: var(--text); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--r-tag); }
::selection { background: var(--accent); color: var(--on-accent); }

.wrap, .reading-wrap {
  width: 100%;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  padding-inline: var(--gutter);
  margin-inline: auto;
  min-width: 0;
}
.reading-wrap { max-width: calc(var(--reading-width) + var(--gutter) * 2); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section-head { margin-bottom: 32px; max-width: 760px; }
.section-head p { color: var(--text-muted); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  line-height: 1.2;
  letter-spacing: -.015em;
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: var(--size-h1); }
h2 { font-size: var(--size-h2); }
h3 { font-size: var(--size-h3); }
h4 { font-size: 18px; }
p { margin-top: 0; margin-bottom: 1.2em; }
h1, h2, h3, h4 { margin-top: 0; margin-bottom: .6em; }
strong { font-weight: var(--weight-strong); }
.nowrap { white-space: nowrap; }
.muted, .meta { color: var(--text-muted); }
.meta { font-family: var(--font-mono); font-size: var(--size-micro); }
.accent, .text-link { color: var(--accent); }
.text-link { text-underline-offset: 5px; }
.text-link:hover { text-decoration: underline; }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; }
:not(pre) > code { font-size: .9em; color: var(--text); }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--r-canvas);
  background: var(--bg-panel);
  color: var(--text);
  font-size: var(--size-small);
  line-height: 1.8;
  tab-size: 2;
}
pre code { white-space: pre; overflow-wrap: normal; word-break: normal; }
.prose, .article-body { min-width: 0; }
.prose p, .article-body p { line-height: 1.9; }
.prose h2, .article-body h2 { margin-top: 2.5em; }
.prose h3, .article-body h3 { margin-top: 1.8em; }
.prose a:not(.btn), .article-body a:not(.btn) { color: var(--accent); }
.prose li, .article-body li { margin-bottom: .5em; }
.prose :is(section, div, article), .article-body :is(section, div, article) { min-width: 0; max-width: 100%; }
[id] { scroll-margin-top: 24px; }
.grid { display: grid; gap: 24px; }
.grid > *, .flex-row > *, .pane > *, .footer-grid > *, .feature-deck > * { min-width: 0; }
.grid-two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.flex-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.panel, .card {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--r-panel);
  background: var(--bg-panel);
  color: var(--text);
}
.card p:last-child, .panel p:last-child { margin-bottom: 0; }
.panel-inset {
  padding: 24px;
  border-radius: var(--r-card);
  background: var(--bg-panel-2);
  color: var(--text);
}
.card-link { display: block; transition: border-color var(--duration) var(--ease); }
.card-link:hover { border-color: var(--accent); }
.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;
  z-index: 100;
  top: 8px;
  left: var(--gutter);
  padding: 10px 16px;
  transform: translateY(-160%);
  background: var(--accent);
  color: var(--on-accent);
  border-radius: var(--r-ctl);
}
.skip-link:focus { transform: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 10px 20px;
  border: 1px solid var(--clear);
  border-radius: var(--r-ctl);
  font-size: var(--size-body);
  font-weight: var(--weight-medium);
  letter-spacing: -.005em;
  line-height: 1.4;
  text-align: center;
  transition: background-color var(--duration) var(--ease), border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}
.btn svg { width: 16px; height: 16px; }
.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: 0 0 0 1px rgba(var(--accent-rgb), .6), 0 10px 28px -12px rgba(var(--accent-rgb), .75);
}
.btn-primary:hover, .btn-primary.is-hover { background: var(--accent-hi); color: var(--on-accent); }
.btn-ghost { background: var(--bg-panel-2); color: var(--text); border-color: var(--border); }
.btn-ghost:hover, .btn-ghost.is-hover { border-color: var(--border-strong); background: var(--bg-panel-3); color: var(--text); }
.btn:active, .btn.is-active { transform: translateY(1px); }
.btn.is-focus { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--bg-panel-2); color: var(--text-muted); box-shadow: none; border-color: var(--border); cursor: not-allowed; }
.btn-arrow { color: var(--text-muted); }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 28px; }

.topbar { position: relative; z-index: 40; height: var(--nav-h); background: var(--bg); color: var(--text); }
.topbar-in {
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  padding-inline: var(--gutter);
  margin-inline: auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: var(--size-body);
  font-weight: var(--weight-medium);
  letter-spacing: -.01em;
  color: var(--text);
  flex-shrink: 0;
}
.brand-mark { width: 28px; height: 28px; display: block; flex-shrink: 0; }
.mainnav { margin-left: auto; min-width: 0; }
.mainnav ul {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}
.mainnav li { display: flex; align-items: center; }
.mainnav li + li::before { content: "·"; color: var(--text-muted); margin: 0 12px; }
.mainnav a { font-size: 14px; color: var(--text-muted); padding: 4px 1px; transition: color var(--duration) var(--ease); }
.mainnav a:hover { color: var(--text); }
.mainnav a[aria-current="page"] {
  color: var(--text);
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
}
.header-tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.language-box { position: relative; }
.lang {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 32px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-size: var(--size-small);
  white-space: nowrap;
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}
.lang:hover { color: var(--text); border-color: var(--border-strong); }
.lang svg { width: 14px; height: 14px; }
.lang-caret { font-size: 10px; color: var(--text-muted); }
.language-menu {
  position: absolute;
  z-index: 4;
  top: calc(100% + 10px);
  right: 0;
  width: 180px;
  padding: 6px;
  margin: 0;
  list-style: none;
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--r-ctl);
}
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; border-radius: var(--r-tag); }
.language-menu a:hover, .language-menu a[aria-current] { background: var(--bg-panel-2); color: var(--accent); }
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--r-ctl);
  background: var(--bg-panel);
  color: var(--text);
}
.menu-toggle svg { width: 20px; height: 20px; }
.mobile-drawer { display: none; }
.nav-veil {
  position: fixed;
  inset: var(--nav-h) 0 0;
  z-index: 30;
  border: 0;
  background: rgba(var(--shade-rgb), .75);
  color: var(--text);
}
.preview-languages { display: flex; flex-wrap: wrap; gap: 12px; margin: 0; padding: 0; list-style: none; }

.hero {
  position: relative;
  overflow-x: clip;
  min-height: calc(100svh - var(--nav-h));
  display: grid;
  align-content: center;
  padding-top: 24px;
  padding-bottom: 24px;
}
.hero-copy { display: flex; flex-direction: column; align-items: center; text-align: center; min-width: 0; }
.facts {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  margin: 0;
  padding: 3px;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
}
.facts li { display: inline-flex; align-items: center; gap: 8px; padding: 5px 13px; font-family: var(--font-mono); font-size: var(--size-micro); line-height: 16px; }
.facts li + li { border-left: 1px solid var(--border); }
.facts-key { color: var(--text); }
.facts-dot { width: 6px; height: 6px; border-radius: var(--r-circle); background: var(--accent); color: var(--on-accent); box-shadow: 0 0 8px rgba(var(--accent-rgb), .85); }
.hero h1 { margin: 22px 0 0; font-size: var(--size-h1); line-height: 1.18; letter-spacing: -.02em; }
.h1-sep { color: var(--text-muted); }
.lede { margin: 14px 0 0; max-width: 660px; font-size: 17px; line-height: 1.6; color: var(--text-muted); }
.lede strong { color: var(--text); font-weight: var(--weight-medium); }
.platforms { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 8px; list-style: none; margin: 20px 0 0; padding: 0; }
.platforms-label { font-family: var(--font-mono); font-size: var(--size-micro); color: var(--text-muted); margin-right: 6px; }
.platforms a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 34px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: rgba(var(--panel-rgb), .8);
  font-size: var(--size-small);
  color: var(--text-muted);
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}
.platforms a:hover { color: var(--text); border-color: rgba(var(--accent-rgb), .5); }
.platforms svg { width: 14px; height: 14px; flex-shrink: 0; }

.site-footer { padding-top: 64px; padding-bottom: 90px; border-top: 1px solid var(--border); background: var(--bg); color: var(--text-muted); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.5fr 1fr; gap: 40px; }
.footer-brand p { margin-top: 18px; max-width: 280px; }
.footer-title { font-size: 14px; font-weight: var(--weight-medium); color: var(--text); margin: 0 0 16px; }
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { display: inline-block; padding-block: 3px; overflow-wrap: anywhere; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 48px; padding-top: 24px; font-size: var(--size-small); }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(14px); }
html.reveal-ready .reveal { transition: opacity .6s var(--ease), transform .6s var(--ease); }

@media (max-width: 1024px) {
  .mainnav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .topbar-in { gap: 16px; }
  .mobile-drawer:not([hidden]) {
    display: block;
    position: absolute;
    z-index: 3;
    top: var(--nav-h);
    left: 0;
    right: 0;
    max-height: calc(100dvh - var(--nav-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 16px var(--gutter) 24px;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg-panel);
    color: var(--text);
  }
  .mobile-drawer ul { list-style: none; padding: 0; margin: 0; }
  .mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 12px; border-radius: var(--r-tag); }
  .mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--bg-panel-2); color: var(--accent); }
  .drawer-label { margin: 20px 12px 8px; color: var(--text-muted); font-size: var(--size-micro); }
}
@media (max-width: 900px) {
  .hero { min-height: auto; padding-top: 40px; padding-bottom: 48px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  :root { --size-h1: clamp(24px, 6.4vw, 30px); --size-h2: clamp(24px, 5.5vw, 30px); }
  .hero h1 { font-size: var(--size-h1); }
  .lede { font-size: var(--size-body); }
  .facts { border-radius: var(--r-soft); }
  .btn { min-height: 44px; }
  .platforms-label { width: 100%; margin: 0 0 2px; text-align: center; }
  .grid-three { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .grid-two { grid-template-columns: 1fr; }
  .panel, .card { padding: 22px; }
  .tilt, [data-tilt] { transform: none !important; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-links { display: flex; flex-wrap: wrap; gap: 4px 18px; }
  .footer-links li { min-width: 0; }
  .footer-links a { padding-block: 8px; }
  .footer-brand p { max-width: none; }
  .brand { font-size: 14px; gap: 8px; }
  .topbar-in { gap: 8px; }
  .lang { padding-inline: 10px; }
  .facts li { padding-inline: 9px; font-size: 11px; }
  pre { padding: 16px; }
}
@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; }
}