:root {
  --bg: #EEF0EF;
  --bg-panel: #FFFFFF;
  --bg-panel-2: #E4E7E6;
  --bg-hero: #F4F5F5;
  --border: #D9DDDB;
  --border-soft: rgba(22,25,26,.07);
  --accent: #1A4DF2;
  --accent-dark: #0E34B8;
  --wine: #6E1A35;
  --text: #16191A;
  --text-muted: #5C6462;
  --success: #1E8E5A;
  --success-text: #176A43;
  --warn: #B7791F;
  --warn-text: #785013;
  --error: #C2333A;
  --clear: transparent;
  --halo-blue: rgba(26,77,242,.14);
  --halo-wine: rgba(110,26,53,.10);
  --accent-ring: rgba(26,77,242,.16);
  --success-ring: rgba(30,142,90,.18);
  --grid-line: rgba(22,25,26,.055);
  --hero-gloss: rgba(255,255,255,.65);
  --veil: rgba(22,25,26,.24);
  --shadow-xs: 0 1px 2px rgba(22,25,26,.06);
  --shadow-far: 0 1px 2px rgba(22,25,26,.05),0 10px 26px -12px rgba(22,25,26,.16);
  --shadow-near: 0 1px 3px rgba(22,25,26,.07),0 22px 44px -16px rgba(22,25,26,.26);
  --shadow-panel: 0 1px 2px rgba(22,25,26,.04),0 30px 60px -40px rgba(22,25,26,.22);
  --shadow-btn: 0 1px 2px rgba(14,52,184,.25),0 8px 20px -8px rgba(26,77,242,.55);
  --node-shadow: drop-shadow(0 10px 18px rgba(14,52,184,.20));
  --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;
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-pill: 999px;
  --r-round: 50%;
  --nav-h: 64px;
  --wrap: 1376px;
  --reading: 820px;
  --header-wrap: 1376px;
  --gutter: 32px;
  --space-section: 88px;
  --ease: cubic-bezier(.2,.7,.2,1);
  --duration: .25s;
  --h1-size: clamp(36px,3.4vw,48px);
  --h2-size: clamp(26px,3vw,38px);
  --h3-size: 22px;
  --body-size: 16px;
  --small-size: 13px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 24px); }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: var(--weight-regular) var(--body-size)/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
img, svg, video { max-width: 100%; vertical-align: middle; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button, a, input, summary { -webkit-tap-highlight-color: var(--clear); }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
::selection { background: var(--accent-ring); color: var(--text); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  line-height: 1.2;
  letter-spacing: -.02em;
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: var(--h1-size); line-height: 1.12; }
h2 { font-size: var(--h2-size); }
h3 { font-size: var(--h3-size); }
p { margin: 0 0 1.25em; }
strong, b { font-weight: var(--weight-medium); }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-hero);
  color: var(--text);
  font-size: 13px;
  line-height: 1.8;
  tab-size: 2;
}
pre code { white-space: pre; overflow-wrap: normal; word-break: normal; }
hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: calc(var(--reading) + var(--gutter) * 2); }
.section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.section-head { max-width: 760px; margin-bottom: 36px; }
.section-head h2 { margin: 10px 0 18px; }
.eyebrow { color: var(--wine); font-size: 12px; letter-spacing: .09em; text-transform: uppercase; }
.muted { color: var(--text-muted); }
.mono { font-family: var(--font-mono); }
.keep { white-space: nowrap; }
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2,minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3,minmax(0,1fr)); }
.grid > *, .hero-panel > *, .footer-grid > *, .feature-layout > *, .prose, .card { min-width: 0; }
.stack > * + * { margin-top: 24px; }
.panel, .card {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  color: var(--text);
  box-shadow: var(--shadow-far);
}
.panel { padding: 36px; }
.card { padding: 28px; }
.card h3 { margin: 0 0 16px; }
.card p:last-child { margin-bottom: 0; }
.prose { line-height: 1.85; }
.prose h2 { margin: 2.2em 0 .8em; }
.prose h3 { margin: 1.6em 0 .7em; }
.prose a:not(.btn) { color: var(--accent-dark); text-decoration: underline; text-underline-offset: .2em; }
.prose li + li { margin-top: .6em; }
.prose :not(pre) > code { background: var(--bg-panel-2); color: var(--text); padding: .1em .3em; border-radius: var(--r-xs); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 10px 24px;
  border: 1px solid var(--clear);
  border-radius: var(--r-pill);
  font-size: 15.5px;
  font-weight: var(--weight-medium);
  line-height: 1.4;
  letter-spacing: -.005em;
  text-align: center;
  transition: background-color var(--duration),color var(--duration),border-color var(--duration),transform var(--duration);
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary { background: var(--accent); color: var(--bg-panel); box-shadow: var(--shadow-btn); }
.btn-primary:hover, .btn-primary.is-hover { background: var(--accent-dark); color: var(--bg-panel); transform: translateY(-1px); }
.btn-ghost { border-color: var(--accent); background: var(--clear); color: var(--accent-dark); }
.btn-ghost:hover { background: var(--bg-panel); color: var(--accent-dark); }
.btn:active { transform: translateY(1px); }
.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-small { min-height: 40px; padding: 8px 18px; font-size: 14px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.topbar, #site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
}
.header-shell {
  width: 100%;
  max-width: min(100%,calc(var(--header-wrap) + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.topbar-in { display: flex; align-items: center; height: var(--nav-h); gap: 40px; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; font-family: var(--font-display); font-size: 16px; font-weight: var(--weight-medium); letter-spacing: -.01em; }
.brand img { display: block; width: 30px; height: 30px; flex-shrink: 0; }
.tabs-nav { min-width: 0; height: 100%; margin-left: auto; }
.tabs {
  position: relative;
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
  gap: 2px;
}
.tabs li { display: flex; height: 100%; flex-shrink: 0; }
.tab { position: relative; display: flex; align-items: center; padding: 0 14px; color: var(--text-muted); font-size: 14.5px; white-space: nowrap; transition: color var(--duration); }
.tab:hover, .tab[aria-current="page"] { color: var(--text); }
.tab::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: -1px; height: 2px; border-radius: var(--r-xs); background: var(--accent); color: var(--bg-panel); transform: scaleX(0); transition: transform .3s var(--ease); }
.tab[aria-current="page"]::after { transform: scaleX(1); }
.nav-slider { position: absolute; width: 1px; height: 2px; left: 0; bottom: -1px; background: var(--accent); color: var(--bg-panel); transform-origin: left center; pointer-events: none; }
.slider-ready .tab::after { visibility: hidden; }
.header-tools { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.lang-wrap { position: relative; }
.lang { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 36px; padding: 7px 14px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--bg-panel); color: var(--text); font-size: 13.5px; }
.lang:hover { border-color: var(--accent); }
.lang svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.4; flex-shrink: 0; }
.lang-caret { font-size: 10px; color: var(--text-muted); }
.lang-short { display: none; }
.lang-menu { position: absolute; top: calc(100% + 12px); right: 0; width: 180px; padding: 8px; border: 1px solid var(--border); border-radius: var(--r-md); background: var(--bg-panel); color: var(--text); box-shadow: var(--shadow-near); }
.lang-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; border-radius: var(--r-sm); }
.lang-menu a:hover, .lang-menu a[aria-current] { background: var(--bg); color: var(--accent-dark); }
.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-sm); background: var(--bg-panel); color: var(--text); }
.menu-toggle svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.mobile-drawer { position: absolute; inset: var(--nav-h) 0 auto; z-index: 3; max-height: calc(100dvh - var(--nav-h)); overflow-y: auto; overscroll-behavior: contain; padding: 16px var(--gutter) 24px; border-bottom: 1px solid var(--border); background: var(--bg-panel); color: var(--text); }
.mobile-drawer ul { padding: 0; margin: 0; list-style: none; }
.mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 46px; padding: 10px 12px; border-bottom: 1px solid var(--border-soft); }
.mobile-drawer a[aria-current] { color: var(--accent-dark); }
.mobile-languages { margin-top: 20px; }
.nav-veil { position: fixed; inset: var(--nav-h) 0 0; z-index: 1; border: 0; background: var(--veil); color: var(--text); cursor: default; }
.footer { padding-top: 64px; padding-bottom: 24px; border-top: 1px solid var(--border); background: var(--bg-panel); color: var(--text); }
.footer-grid { display: grid; grid-template-columns: 1.35fr 1fr 1.2fr .8fr; gap: 48px; }
.footer p { color: var(--text-muted); margin-top: 20px; max-width: 28em; font-size: 14px; }
.footer h2 { font-size: 14px; margin: 0 0 18px; letter-spacing: 0; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li + li { margin-top: 9px; }
.footer li a { font-size: 13px; color: var(--text-muted); overflow-wrap: anywhere; }
.footer li a:hover { color: var(--accent-dark); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-muted); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 20px; }
.reveal { opacity: 1; transform: none; }
.reveal-pending .reveal:not(.shown) { opacity: 0; transform: translateY(18px); }
.reveal-pending .reveal { transition: opacity .65s var(--ease),transform .65s var(--ease); }
.reveal.shown { opacity: 1; transform: none; }
.decor-region, .hero, .grid-canvas { overflow-x: clip; }
.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(--gutter); top: -100px; z-index: 100; padding: 12px 20px; border-radius: var(--r-sm); background: var(--accent); color: var(--bg-panel); }
.skip-link:focus { top: 8px; color: var(--bg-panel); }
@media (max-width: 1280px) {
  .topbar-in { gap: 20px; }
  .footer-grid { gap: 28px; }
}
@media (max-width: 1100px) {
  .tabs-nav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
}
@media (min-width: 1101px) {
  .mobile-drawer, .nav-veil { display: none !important; }
}
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .footer-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 768px) {
  :root { --h1-size: clamp(24px,7vw,30px); --space-section: 56px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .grid-2, .grid-3 { grid-template-columns: minmax(0,1fr); }
  .panel, .card { padding: 22px; }
  .tilt, [class*="tilt-"] { transform: none !important; }
  .brand { gap: 7px; font-size: 14px; }
  .brand img { width: 28px; height: 28px; }
  .topbar-in { gap: 8px; }
  .header-tools { gap: 6px; margin-left: auto; }
  .lang { padding-inline: 10px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .lang svg { display: none; }
  .footer-grid { gap: 32px 20px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { margin-top: 32px; }
  pre { padding: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal-pending .reveal:not(.shown) { opacity: 1; transform: none; }
}