:root {
  --bg:#E9EEF9;
  --bg-hero-top:#F2F5FC;
  --bg-hero-bottom:#E3E9F6;
  --panel:#F7F9FE;
  --panel-2:#DCE4F4;
  --tint:#FDE9E4;
  --border:#C9D3EA;
  --accent:#EC5B45;
  --accent-dark:#C4402C;
  --peach:#F4926A;
  --text:#141A2E;
  --muted:#55607A;
  --success:#1F9D6B;
  --warn:#B9800F;
  --error:#D2384B;
  --white:#FFFFFF;
  --clear:transparent;
  --hl:rgba(255,255,255,.95);
  --hl-soft:rgba(255,255,255,.45);
  --edge-panel:#D3DBEE;
  --edge-panel-deep:#B8C4E0;
  --edge-panel-2:#C3CEE7;
  --edge-panel-2-deep:#A8B6D7;
  --edge-tint:#F3CBBF;
  --edge-tint-deep:#E6AA99;
  --shadow-coral:rgba(236,91,69,.10);
  --shadow-coral-strong:rgba(236,91,69,.16);
  --shadow-ink:rgba(20,26,46,.08);
  --grid-line:rgba(20,26,46,.04);
  --glow-peach:rgba(244,146,106,.22);
  --nav-bg:rgba(247,249,254,.86);
  --veil:rgba(20,26,46,.24);
  --flag-red:#D7283B;
  --flag-white:#FFFFFF;
  --flag-blue:#253A75;
  --flag-black:#1B1D24;
  --flag-gold:#F1C232;
  --flag-green:#1F8A4D;
  --flag-edge:rgba(20,26,46,.14);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --text-xs:12px;
  --text-detail:12.5px;
  --text-sm:13px;
  --text-table:13.5px;
  --text-nav:14px;
  --text-button:15px;
  --text-base:16px;
  --text-lede:17px;
  --text-brand:18px;
  --text-card:20px;
  --text-number:22px;
  --text-stat:28px;
  --text-h2:32px;
  --text-hero:64px;
  --text-hero-tablet:56px;
  --text-hero-mobile:40px;
  --text-micro:11.5px;
  --r-lg:10px;
  --r-md:8px;
  --r-sm:6px;
  --r-flag:3px;
  --r-line:2px;
  --r-window:9px;
  --r-pill:999px;
  --r-circle:50%;
  --edge:6px;
  --card-edge:4px;
  --container:1200px;
  --reading:800px;
  --gutter:32px;
  --header-height:64px;
  --toc-height:60px;
  --anchor-space:calc(var(--header-height) + var(--toc-height) + 16px);
  --ease: cubic-bezier(.2,.7,.3,1);
  --time-fast:.2s;
  --time-reveal:.35s;
}

*,*::before,*::after { box-sizing:border-box }
html { -webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-height) + 16px);scroll-behavior:smooth }
body { margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-base);line-height:1.6;-webkit-font-smoothing:antialiased }
[hidden] { display:none !important }
img { display:block;max-width:100%;height:auto }
svg { flex-shrink:0;vertical-align:middle }
button,input,select,textarea { font:inherit;color:inherit }
button { cursor:pointer }
a { color:inherit;text-decoration:none }
a,button,summary { -webkit-tap-highlight-color:var(--clear) }
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible { outline:2px solid var(--text);outline-offset:3px;border-radius:var(--r-sm) }
p { margin:0 }
h1,h2,h3,h4 { margin:0;font-family:var(--font-display);font-weight:var(--weight-display);line-height:1.25;overflow-wrap:break-word }
h1 { font-size:clamp(52px,5vw,72px);letter-spacing:-.02em;line-height:1.1 }
h2 { font-size:var(--text-h2);letter-spacing:-.02em }
h3 { font-size:var(--text-card) }
ul,ol { padding-left:1.5em }
li::marker { color:var(--muted) }
hr { border:0;border-top:1px solid var(--border);margin:32px 0 }
code,kbd,pre { font-family:var(--font-mono);font-size:var(--text-sm) }
code { overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-sm);padding:2px 5px }
pre { max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md);white-space:pre;overscroll-behavior-inline:contain }
pre code { padding:0;background:var(--clear);overflow-wrap:normal }
table { border-collapse:collapse }
th,td { text-align:left }
:where(.wrap,.reading-wrap) { width:100%;margin-inline:auto;padding-inline:var(--gutter);min-width:0 }
.wrap { max-width:calc(var(--container) + var(--gutter) * 2) }
.reading-wrap { max-width:calc(var(--reading) + var(--gutter) * 2) }
:where(main,section,article,aside,nav,div,li) { min-width:0 }
.no-break { white-space:nowrap }
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0 }
.section { padding-top:72px;padding-bottom:72px }
.section__head { margin-bottom:32px;max-width:52em }
.section__head p { margin-top:14px;color:var(--muted) }
.stack { display:grid;gap:24px }
.inline-row { display:flex;align-items:center;flex-wrap:wrap;gap:12px }
.muted { color:var(--muted) }
.mono { font-family:var(--font-mono);font-variant-numeric:tabular-nums }
.panel,.card { background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hl),0 var(--card-edge) 0 var(--edge-panel),0 18px 38px var(--shadow-coral);padding:24px }
.panel--recess { background:var(--panel-2) }
.prose { overflow-wrap:break-word }
.prose > * + * { margin-top:20px }
.prose h2 { margin-top:48px }
.prose h3 { margin-top:32px }
.prose p,.prose li { line-height:1.85 }
.prose a:not(.btn) { text-decoration:underline;text-underline-offset:4px }
.prose section + section { margin-top:48px }
.decor-section { position:relative;isolation:isolate;overflow-x:clip }
[data-parallax-decor] { pointer-events:none;max-width:100% }
#server-status { position:static;display:block;min-height:96px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px }
#server-status + * { margin-top:32px }
.reveal { transition:opacity var(--time-reveal) var(--ease),transform var(--time-reveal) var(--ease) }
.reveal.pending { opacity:0;transform:translateY(16px) }
.reveal.shown { opacity:1;transform:none }

.cta-row { display:flex;gap:12px;margin-top:28px }
.btn { display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:8px;min-height:46px;padding:10px 22px;border:1px solid var(--clear);border-radius:var(--r-md);font-size:var(--text-button);font-weight:var(--weight-bold);line-height:1.4;white-space:nowrap;transition:transform var(--time-fast) var(--ease),box-shadow var(--time-fast) var(--ease) }
.btn svg { width:16px;height:16px }
.btn--primary { color:var(--text);background:linear-gradient(135deg,var(--accent),var(--peach));box-shadow:inset 0 1px 0 var(--hl-soft),0 3px 0 var(--accent-dark),0 14px 30px var(--shadow-coral-strong) }
.btn--ghost { color:var(--text);background:var(--panel);border-color:var(--text);box-shadow:inset 0 1px 0 var(--hl),0 3px 0 var(--edge-panel) }
.btn:hover { transform:translateY(-1px) }
.btn:active,.btn.is-pressed { transform:translateY(2px) }
.btn:disabled,.btn[aria-disabled="true"] { opacity:.55;cursor:not-allowed;transform:none;box-shadow:none }
.btn--small { min-height:36px;padding:7px 14px;font-size:var(--text-sm) }

#site-header,.preview-header { position:sticky;top:0;z-index:50 }
.topbar { position:relative;background:var(--nav-bg);-webkit-backdrop-filter:saturate(1.2) blur(10px);backdrop-filter:saturate(1.2) blur(10px);border-bottom:1px solid var(--border);z-index:53 }
.topbar__in { display:flex;align-items:center;height:var(--header-height);gap:20px;flex-wrap:nowrap }
.brand { display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--text-brand);letter-spacing:-.02em;white-space:nowrap;flex-shrink:0;min-height:34px }
.brand__mark { width:30px;height:30px;flex-shrink:0 }
.brand__sub { font-weight:var(--weight-medium);font-size:var(--text-sm);color:var(--muted);letter-spacing:0;padding-left:10px;border-left:1px solid var(--border) }
.tabs { display:flex;align-self:stretch;margin-left:8px;flex:1;min-width:0;overflow:visible }
.tabs > ul { display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:0;min-width:0 }
.tabs li { display:flex;align-self:stretch }
.tabs a { position:relative;display:flex;align-items:center;min-height:44px;padding:0 9px;font-size:var(--text-nav);color:var(--muted);white-space:nowrap;transition:color var(--time-fast) }
.tabs a::after { content:"";position:absolute;left:11px;right:11px;bottom:0;height:2px;border-radius:var(--r-line);background:var(--accent);transform:scaleX(0);transform-origin:left center;opacity:.45;transition:transform .25s ease,opacity .25s ease }
.tabs a:hover { color:var(--text) }
.tabs a:hover::after { transform:scaleX(1) }
.tabs a[aria-current="page"] { color:var(--text);font-weight:var(--weight-semibold) }
.tabs a[aria-current="page"]::after { transform:scaleX(1);opacity:1 }
.topbar__end { margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0 }
.lang-picker { position:relative }
.lang { display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:34px;padding:0 10px;border:0;border-radius:var(--r-md);background:var(--clear);font-size:var(--text-sm);color:var(--muted);white-space:nowrap }
.lang svg { width:15px;height:15px }
.lang__text { white-space:nowrap }
.lang:hover { background:var(--panel-2);color:var(--text) }
.lang-menu { position:absolute;right:0;top:calc(100% + 12px);z-index:60;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:0 18px 38px var(--shadow-ink) }
.lang-menu a { display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--text-nav) }
.lang-menu a:hover,.lang-menu a[aria-current="true"] { background:var(--panel-2) }
.login { display:inline-flex;align-items:center;justify-content:center;min-height:34px;padding:0 16px;border:1px solid var(--text);border-radius:var(--r-md);background:var(--panel);font-size:var(--text-nav);font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl),0 2px 0 var(--edge-panel);transition:transform var(--time-fast) ease }
.login:hover { transform:translateY(-1px) }
.menu-toggle { display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel) }
.menu-toggle__line { display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-line) }
.nav-veil { position:fixed;inset:var(--header-height) 0 0;z-index:51;background:var(--veil);border:0;width:100%;padding:0 }
.nav-drawer { position:fixed;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:52;background:var(--panel);padding:16px var(--gutter) 32px }
.nav-drawer a { display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--r-md);border-bottom:1px solid var(--border) }
.nav-drawer a[aria-current="page"],.nav-drawer a:hover { background:var(--panel-2) }
.nav-drawer__languages { display:grid;margin-top:24px;border-top:1px solid var(--border);padding-top:12px }
html.nav-open { overflow:hidden }

.site-footer { border-top:1px solid var(--border);background:var(--panel-2);padding-top:48px;padding-bottom:28px }
.footer-grid { display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px }
.footer-brand p { color:var(--muted);margin-top:16px;max-width:28em }
.footer-heading { font-size:var(--text-nav);font-weight:var(--weight-bold);margin-bottom:12px }
.footer-links { display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 20px;list-style:none;margin:0;padding:0 }
.footer-links a,.footer-languages a,.footer-legal a { display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-nav) }
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover { text-decoration:underline;text-underline-offset:4px }
.footer-languages { display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border) }
.footer-bottom { display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:20px;color:var(--muted);font-size:var(--text-sm) }
.footer-legal { display:flex;gap:24px }

@media (max-width:1180px) {
  .topbar__in { gap:16px }
  .tabs { display:none }
  .menu-toggle { display:flex }
  .topbar__end { margin-left:auto }
}
@media (min-width:1181px) {
  .nav-drawer,.nav-veil { display:none !important }
  html.nav-open { overflow:auto }
}
@media (max-width:768px) {
  h1 { font-size:var(--text-hero-mobile) }
  h2 { font-size:var(--text-stat) }
  .section { padding-top:48px;padding-bottom:48px }
  .footer-grid { grid-template-columns:1fr;gap:28px }
}
@media (max-width:640px) {
  :root { --gutter:20px }
  .no-break { white-space:normal }
  .topbar__in { gap:8px }
  .brand__sub { display:none }
  .brand { font-size:var(--text-base);gap:7px }
  .brand__mark { width:28px;height:28px }
  .topbar__end { margin-left:auto;gap:4px }
  .lang__text { display:none }
  .login { padding:0 12px }
  .cta-row { flex-wrap:wrap }
  .panel,.card { padding:20px }
  .tilt,[data-tilt] { transform:none }
  [data-parallax-decor] { max-width:100% }
}
@media (max-width:360px) {
  :root { --gutter:16px }
  .topbar__in { gap:4px }
  .brand { font-size:var(--text-button) }
  .login { padding:0 10px }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto }
  *,*::before,*::after { transition:none !important;animation:none !important }
  .reveal,.reveal.pending { opacity:1;transform:none }
  .btn:hover,.blk:hover,.login:hover { transform:none }
}