:root {
  --bg:#3A57FB;
  --panel:#FFFFFF;
  --panel-2:#F4F6FC;
  --border:#E3E6F2;
  --border-soft:#EEF0F7;
  --accent:#FF7A1A;
  --accent-dark:#D95E00;
  --accent-ink:#A74400;
  --accent-soft:#FFF2E8;
  --accent-line:#FFC9A1;
  --cyan:#22C7E8;
  --cyan-soft:#9BE9F7;
  --text:#12163A;
  --muted:#5A6080;
  --muted-2:#8A90AD;
  --success:#17B26A;
  --success-soft:rgba(23,178,106,.18);
  --warn:#F5B70A;
  --warn-soft:rgba(245,183,10,.20);
  --error:#E5484D;
  --error-soft:rgba(229,72,77,.16);
  --on-field:#FFFFFF;
  --on-field-2:rgba(255,255,255,.82);
  --on-field-3:rgba(255,255,255,.72);
  --on-field-line:rgba(255,255,255,.30);
  --on-field-fill:rgba(255,255,255,.08);
  --on-field-hover:rgba(255,255,255,.14);
  --frame-a:#8FA2FF;
  --peach-wash:rgba(255,224,204,.94);
  --clear:rgba(255,255,255,0);
  --toggle-off:#D5D9E8;
  --code-key:#3451F2;
  --code-str:#A74400;
  --glow:rgba(52,81,242,.30);
  --glow-0:rgba(52,81,242,0);
  --veil:rgba(18,22,58,.42);
  --sh-device:inset 0 1px 0 rgba(255,255,255,.45),0 2px 4px rgba(18,22,58,.06),0 18px 40px -10px rgba(18,22,58,.20),0 48px 96px -28px rgba(26,44,190,.50);
  --sh-win:0 0 0 1px rgba(18,22,58,.06),0 2px 8px rgba(18,22,58,.08);
  --sh-card:0 1px 2px rgba(18,22,58,.04);
  --sh-btn:inset 0 1px 0 rgba(255,255,255,.28),0 8px 18px -8px rgba(217,94,0,.60);
  --sh-knob:0 1px 2px rgba(18,22,58,.28);
  --sh-dl:0 1px 2px rgba(18,22,58,.04),0 10px 24px -16px rgba(18,22,58,.18);
  --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,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-ctl:4px;
  --r-card:8px;
  --r-frame:12px;
  --r-knob:3px;
  --r-round:50%;
  --gutter:24px;
  --w-frame:1120px;
  --w-inner:1080px;
  --w-reading:780px;
  --w-head:1280px;
  --dev-h:418px;
  --head-h:68px;
  --size-body:16px;
  --size-small:14px;
  --size-h1:clamp(34px,3.4vw,48px);
  --size-h2:32px;
  --size-h3:22px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-bold:600;
  --space-section:104px;
  --motion-fast:150ms;
  --motion-reveal:500ms;
}
*,*::before,*::after { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:24px; }
html.nav-open { overflow:hidden; }
body {
  margin:0;
  background:var(--bg);
  color:var(--on-field);
  font-family:var(--font-body);
  font-size:var(--size-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a { color:inherit; text-decoration:none; }
button,input,select,textarea { font:inherit; }
button { cursor:pointer; }
button,a,summary { -webkit-tap-highlight-color:var(--clear); }
button { color:inherit; }
:focus-visible { outline:2px solid var(--cyan); outline-offset:3px; border-radius:var(--r-ctl); }
[hidden] { display:none !important; }
img,svg { display:block; max-width:100%; }
img { height:auto; }
svg { flex-shrink:0; }
p { margin:0 0 1em; }
h1,h2,h3,h4 { font-family:var(--font-display); text-wrap:balance; overflow-wrap:break-word; }
h1 { margin:0 0 24px; font-size:var(--size-h1); font-weight:var(--weight-normal); line-height:1.18; letter-spacing:-.005em; }
h2 { margin:0 0 20px; font-size:var(--size-h2); font-weight:var(--weight-normal); line-height:1.25; }
h3 { margin:0 0 14px; font-size:var(--size-h3); font-weight:var(--weight-medium); line-height:1.4; }
h4 { font-size:var(--size-body); }
strong,b { font-weight:var(--weight-bold); }
ul,ol { padding-inline-start:1.4em; }
code,kbd,pre,samp { font-family:var(--font-mono); }
code { overflow-wrap:anywhere; }
pre {
  max-width:100%; min-width:0; margin:20px 0; padding:20px;
  overflow-x:auto; overscroll-behavior-inline:contain;
  background:var(--panel-2); color:var(--text);
  border:1px solid var(--border); border-radius:var(--r-ctl);
  font-size:var(--size-small); line-height:1.7; tab-size:2;
}
pre code { overflow-wrap:normal; word-break:normal; white-space:pre; }
blockquote { margin-inline:0; }
hr { margin-block:32px; border:0; border-top:1px solid var(--border); }
.wrap,.wrap-inner,.reading,.head-wrap {
  width:100%; margin-inline:auto; padding-inline:var(--gutter); min-width:0;
}
.wrap { max-width:calc(var(--w-frame) + var(--gutter) * 2); }
.wrap-inner { max-width:calc(var(--w-inner) + var(--gutter) * 2); }
.reading { max-width:calc(var(--w-reading) + var(--gutter) * 2); }
.head-wrap { max-width:min(100%,calc(var(--w-head) + var(--gutter) * 2)); }
.section { padding-top:var(--space-section); padding-bottom:var(--space-section); }
.section-soft { background:var(--panel-2); color:var(--text); }
.section-white { background:var(--panel); color:var(--text); }
.section-field { background:var(--bg); color:var(--on-field); }
.section-lead { max-width:42em; color:var(--muted); }
.eyebrow { margin:0; font-size:13px; letter-spacing:.08em; color:var(--accent-ink); font-weight:var(--weight-bold); }
.section-field .eyebrow { color:var(--on-field); }
.keep { white-space:nowrap; }
.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; }
.grid-two { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:24px; }
.grid-two > *, .wrap > *, .wrap-inner > *, .reading > * { min-width:0; }
.stack > * + * { margin-top:24px; }
.prose { min-width:0; }
.tutorial-document,.manual-body { background:var(--panel); color:var(--text); }
.prose h2 { margin-top:64px; }
.prose h3 { margin-top:36px; }
.prose p,.prose li { line-height:1.85; }
.prose a:not(.btn) { color:var(--bg); text-decoration:underline; text-underline-offset:3px; }
.prose :not(pre) > code { padding:2px 4px; background:var(--panel-2); color:var(--text); border-radius:var(--r-ctl); }
.prose img { margin-block:24px; }
.prose section { scroll-margin-top:24px; }
.btn {
  display:inline-flex; justify-content:center; align-items:center; gap:10px;
  min-height:50px; max-width:100%; padding:10px 26px;
  border:1px solid var(--clear); border-radius:var(--r-ctl);
  background:var(--panel); color:var(--text);
  font-size:var(--size-body); font-weight:var(--weight-bold); line-height:1.4; letter-spacing:.01em;
  text-align:center; transition:background-color var(--motion-fast),border-color var(--motion-fast);
}
.btn svg { width:18px; height:18px; }
.btn-primary { background:var(--accent); color:var(--text); box-shadow:var(--sh-btn); }
.btn-primary:hover,.btn-primary.is-hover { background:var(--accent-line); color:var(--text); }
.btn-primary:active,.btn-primary.is-active { background:var(--accent-dark); color:var(--on-field); }
.hero .btn-primary { color:var(--on-field); }
.hero .btn-primary:hover { background:var(--accent-dark); color:var(--on-field); }
.btn-secondary { border-color:var(--border); background:var(--panel); color:var(--text); }
.btn-secondary:hover { border-color:var(--bg); }
.btn-ghost { border:1.5px solid var(--on-field-2); background:var(--clear); color:var(--on-field); }
.btn-ghost:hover { background:var(--on-field-hover); color:var(--on-field); border-color:var(--on-field); }
.btn:disabled,.btn[aria-disabled="true"] { background:var(--panel-2); color:var(--muted); border-color:var(--border); box-shadow:none; cursor:not-allowed; }
.btn.is-focus { outline:2px solid var(--cyan); outline-offset:3px; }
.btn-small { min-height:44px; padding:8px 16px; font-size:var(--size-small); }
.cta,.button-samples { display:flex; flex-wrap:wrap; align-items:center; gap:14px; }
.cta { margin-top:26px; }
.btn-arrow { font-weight:var(--weight-normal); }
.card,.panel {
  min-width:0; padding:28px;
  background:var(--panel); color:var(--text);
  border:1px solid var(--border); border-radius:var(--r-card);
}
.card { box-shadow:var(--sh-card); }
.card p:last-child,.panel p:last-child { margin-bottom:0; }
.site-head,#site-header { position:relative; z-index:50; background:var(--bg); color:var(--on-field); }
.head-wrap { display:flex; align-items:center; gap:28px; min-height:var(--head-h); }
.brand {
  display:inline-flex; align-items:center; flex-shrink:0; gap:11px;
  color:var(--on-field); font-size:17px; font-weight:var(--weight-bold); letter-spacing:.005em;
}
.brand img { width:30px; height:30px; flex-shrink:0; }
.nav { display:flex; align-items:center; min-width:0; margin-left:auto; }
.nav ul { display:flex; align-items:center; gap:38px; list-style:none; margin:0; padding:0; }
.nav a { display:block; padding-block:6px; color:var(--on-field-2); font-size:15px; white-space:nowrap; }
.nav a:hover,.nav a[aria-current="page"] { color:var(--on-field); }
.nav a[aria-current="page"] { font-weight:var(--weight-bold); }
.head-tools { display:flex; align-items:center; flex-shrink:0; gap:10px; }
.language-picker { position:relative; }
.lang {
  display:flex; align-items:center; gap:6px; min-height:44px; padding:6px 0 6px 28px;
  border:0; border-left:1px solid var(--on-field-line);
  background:var(--clear); color:var(--on-field-2); font-size:14px; white-space:nowrap;
}
.lang:hover { color:var(--on-field); }
.lang-short { display:none; }
.language-menu {
  position:absolute; right:0; top:calc(100% + 8px); z-index:4;
  min-width:180px; margin:0; padding:8px; list-style:none;
  background:var(--panel); color:var(--text); border:1px solid var(--border); border-radius:var(--r-card); box-shadow:var(--sh-dl);
}
.language-menu a { display:block; min-height:44px; padding:10px 14px; }
.language-menu a:hover,.language-menu [aria-current="true"] { background:var(--accent-soft); color:var(--accent-ink); }
.menu-toggle { display:none; align-items:center; justify-content:center; min-width:44px; min-height:44px; border:1px solid var(--on-field-line); border-radius:var(--r-ctl); background:var(--clear); color:var(--on-field); }
.menu-toggle svg { width:22px; height:22px; }
.mobile-drawer {
  position:absolute; inset:100% 0 auto; z-index:3;
  padding:16px var(--gutter) 24px; max-height:calc(100dvh - var(--head-h)); overflow-y:auto; overscroll-behavior:contain;
  background:var(--panel); color:var(--text); border-bottom:1px solid var(--border);
}
.mobile-drawer ul { list-style:none; margin:0; padding:0; }
.mobile-drawer a { display:block; width:100%; min-height:44px; padding:12px 16px; }
.mobile-drawer a:hover,.mobile-drawer [aria-current] { background:var(--accent-soft); color:var(--accent-ink); }
.drawer-label { margin:16px 16px 8px; color:var(--muted); font-size:13px; }
.nav-veil { position:fixed; inset:var(--head-h) 0 0; z-index:40; border:0; background:var(--veil); color:var(--on-field); }
.site-footer {
  padding-top:64px; padding-bottom:28px;
  background:var(--panel-2); color:var(--text); border-top:1px solid var(--border);
}
.footer-grid { display:grid; grid-template-columns:1.35fr 1fr 1.5fr .9fr; gap:36px; }
.footer-grid > * { min-width:0; }
.site-footer .brand { color:var(--text); }
.footer-intro { margin-top:18px; max-width:25em; color:var(--muted); font-size:14px; }
.footer-title { margin:0 0 16px; font-size:14px; font-weight:var(--weight-bold); }
.footer-links { list-style:none; padding:0; margin:0; }
.footer-links a { display:inline-block; padding-block:5px; color:var(--muted); overflow-wrap:anywhere; font-size:14px; }
.footer-links a:hover { color:var(--bg); text-decoration:underline; text-underline-offset:4px; }
.footer-bottom { display:flex; flex-wrap:wrap; justify-content:space-between; gap:16px; margin-top:40px; padding-top:22px; border-top:1px solid var(--border); color:var(--muted); font-size:13px; }
.footer-legal { display:flex; flex-wrap:wrap; gap:20px; }
.reveal { opacity:1; }
.reveal-enabled .reveal:not(.shown) { opacity:0; transform:translateY(14px); }
.reveal-enabled .reveal { transition:opacity var(--motion-reveal),transform var(--motion-reveal); }
.reveal-enabled .reveal.shown { opacity:1; transform:none; }
.decorated { position:relative; overflow-x:clip; }
@media (max-width:1280px) {
  .head-wrap { gap:20px; }
  .nav ul { gap:24px; }
}
@media (max-width:1100px) {
  .nav { display:none; }
  .head-tools { margin-left:auto; }
  .menu-toggle { display:flex; }
  .footer-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .preview-head .head-wrap { flex-wrap:wrap; padding-top:14px; padding-bottom:14px; }
  .preview-head .nav { display:flex; order:3; width:100%; margin:0; }
  .preview-head .nav ul { flex-wrap:wrap; gap:8px 24px; }
}
@media (min-width:1101px) {
  .mobile-drawer,.nav-veil { display:none !important; }
}
@media (max-width:768px) {
  :root { --size-h1:clamp(24px,4.8vw,30px); --size-h2:26px; --size-h3:20px; --space-section:64px; }
  .grid-two { grid-template-columns:minmax(0,1fr); }
}
@media (max-width:640px) {
  :root { --gutter:20px; }
  .brand { gap:8px; font-size:14px; }
  .brand img { width:28px; height:28px; }
  .head-wrap { gap:10px; }
  .head-tools { margin-left:auto; gap:6px; }
  .lang { padding-left:10px; }
  .lang-full { display:none; }
  .lang-short { display:inline; }
  .card,.panel { padding:20px; }
  .footer-grid { grid-template-columns:minmax(0,1fr); gap:28px; }
  .tilt,[data-tilt] { transform:none !important; }
  .keep { white-space:normal; }
  .keep-word { white-space:nowrap; }
  .btn { padding-inline:20px; }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto; }
  *,*::before,*::after { animation:none !important; transition:none !important; }
  .reveal-enabled .reveal:not(.shown) { opacity:1; transform:none; }
}