:root{
  --bg:#E7ECF8;
  --bg-panel:#F7F9FE;
  --bg-panel-2:#D9E1F2;
  --border:#C9D3EA;
  --accent:#12C2B8;
  --accent-hover:#10B1A8;
  --accent-dark:#0B7E78;
  --accent-soft:rgba(18,194,184,.26);
  --accent-soft-2:rgba(18,194,184,.12);
  --accent-tint:#E3F7F4;
  --accent-line:rgba(18,194,184,.45);
  --lime:#CFEF5A;
  --text:#13203A;
  --text-muted:#56617A;
  --success:#1FA971;
  --warn:#D9961E;
  --error:#D6453D;
  --white:#FFFFFF;
  --ink:#0E1729;
  --ink-hover:#1B2742;
  --navy-1:#16264A;
  --navy-2:#0F1B38;
  --hero-top:#F1F4FC;
  --hero-bottom:#E2E8F6;
  --line:rgba(201,211,234,.8);
  --on-dark:#E7ECF8;
  --on-dark-muted:rgba(231,236,248,.46);
  --on-dark-line:rgba(255,255,255,.14);
  --wash-teal:rgba(18,194,184,.08);
  --wash-blue:rgba(111,132,184,.07);
  --glow-blue:rgba(111,132,184,.34);
  --glow-teal:rgba(18,194,184,.12);
  --lug-front-1:#9FB1DA;
  --lug-front-2:#6F84B8;
  --lug-side-1:#4C5F93;
  --lug-side-2:#394A7B;
  --lug-top-1:#D6DFF4;
  --lug-top-2:#AEBDE3;
  --lug-rib-1:#BAC8E9;
  --lug-rib-2:#7C90C2;
  --lug-rod-1:#DCE3F4;
  --lug-rod-2:#8193C2;
  --lug-grip-1:#7387BC;
  --lug-grip-2:#3E5086;
  --lug-wheel:#0A1328;
  --lug-rim:#8597C6;
  --lug-floor:#040A1A;
  --flag-red:#D8343F;
  --flag-navy:#1B2E7A;
  --flag-blue:#2152B4;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(19,32,58,.16);
  --shadow-chip:0 0 0 1px rgba(201,211,234,.95),0 8px 18px -12px rgba(15,27,56,.12);
  --shadow-cta:0 14px 26px -14px rgba(11,126,120,.75);
  --shadow-card:inset 0 0 0 1px rgba(255,255,255,.07),inset 0 1px 0 rgba(255,255,255,.16),0 52px 96px -36px rgba(15,27,56,.5),0 18px 44px -18px rgba(15,27,56,.12);
  --shadow-window:inset 0 1px 0 rgba(255,255,255,.95),0 30px 60px -6px rgba(18,194,184,.10),0 26px 50px -22px rgba(4,10,26,.6);
  --shadow-float:inset 0 1px 0 rgba(255,255,255,.95),0 18px 36px -14px rgba(4,10,26,.6);
  --shadow-dark:0 0 0 1px rgba(255,255,255,.14),0 16px 30px -12px rgba(4,10,26,.7);
  --shadow-deep:rgba(4,10,26,.5);
  --shadow-fab:0 18px 36px -14px rgba(15,27,56,.45),0 0 0 1px rgba(255,255,255,.06);
  --shadow-panel:inset 0 1px 0 rgba(255,255,255,.95),0 24px 64px -24px rgba(15,27,56,.12);
  --veil:rgba(15,27,56,.38);
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:20px;
  --radius-xl:32px;
  --radius-pill:999px;
  --radius-circle:50%;
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --size-body:16px;
  --size-small:14px;
  --size-caption:12px;
  --size-display:clamp(52px,4.6vw,66px);
  --size-h2:36px;
  --size-h3:24px;
  --weight-body:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --gutter:64px;
  --content-max:1280px;
  --nav-height:72px;
  --anchor-offset:88px;
  --toc-offset:88px;
  --toc-anchor:160px;
  --ease-ui:cubic-bezier(.2,.7,.2,1);
  --duration-ui:180ms;
  --duration-reveal:600ms;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;position:relative;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);font-weight:var(--weight-body);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:clip}
html.nav-open{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
a,button,summary,input,select,textarea,[tabindex]{-webkit-tap-highlight-color:var(--accent-soft-2)}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:4px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
p,h1,h2,h3,h4,ul,ol,figure,blockquote{margin:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-display);line-height:1.2;text-wrap:balance}
h1{font-size:var(--size-display);line-height:1.1;letter-spacing:var(--tracking-cjk)}
h2{font-size:var(--size-h2);letter-spacing:var(--tracking-cjk)}
h3{font-size:var(--size-h3)}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0;max-width:100%}
svg.icon{width:24px;height:24px}
[hidden]{display:none!important}
.wrap{width:100%;max-width:calc(var(--content-max) + 2 * var(--gutter));margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*{min-width:0}
.section{position:relative;padding-top:64px;padding-bottom:64px}
.section-head{margin-bottom:32px;max-width:48em}
.section-head p{margin-top:12px;color:var(--text-muted)}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono)}
.muted{color:var(--text-muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-two>*,.grid-three>*{min-width:0}
.panel,.card{min-width:0;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-panel);padding:28px}
.panel{border-radius:var(--radius-xl)}
.prose{max-width:76ch;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote,.prose .table-scroll{margin-block:20px}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose li+li{margin-top:8px}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--bg-panel-2);border-radius:var(--radius-sm);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;background:var(--navy-2);color:var(--on-dark);border-radius:var(--radius-md);padding:20px;tab-size:2}
pre code{background:transparent;padding:0;white-space:pre;overflow-wrap:normal}
.backdrop{position:absolute;top:0;left:0;right:0;height:980px;max-width:100%;overflow-x:clip;pointer-events:none;z-index:0;background:radial-gradient(ellipse 58% 52% at 0% 0%,var(--wash-teal),transparent 72%),linear-gradient(128deg,var(--wash-teal) 0%,var(--wash-blue) 34%,transparent 58%),linear-gradient(180deg,var(--hero-top) 0%,var(--hero-bottom) 84%,var(--bg) 100%)}
.decorated,.stripe-halo{overflow-x:clip;max-width:100%}
.notice{position:relative;z-index:3;background:var(--navy-2);color:var(--white)}
.notice-inner{display:flex;align-items:center;justify-content:center;gap:20px;min-height:44px;padding-top:7px;padding-bottom:7px}
.notice-text{font-size:var(--size-small);font-weight:var(--weight-medium);line-height:1.4}
.notice-text strong{color:var(--lime);font-weight:var(--weight-bold)}
.notice-actions{display:flex;gap:8px;flex-shrink:0}
.btn-xs{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:0 14px;border-radius:var(--radius-sm);font-size:13px;font-weight:var(--weight-bold);line-height:1;white-space:nowrap}
.btn-xs.is-teal{background:var(--accent);color:var(--ink)}
.btn-xs.is-teal:hover{background:var(--accent-hover)}
.btn-xs.is-light{background:var(--white);color:var(--ink)}
.btn-xs.is-light:hover{background:var(--bg-panel-2)}
.topnav{position:relative;z-index:30;border-bottom:1px solid var(--line)}
.nav-inner{position:relative;display:flex;align-items:center;gap:40px;min-height:var(--nav-height)}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:21px;font-weight:var(--weight-display);letter-spacing:-.02em;color:var(--text);flex-shrink:0;min-height:44px}
.brand img{width:34px;height:34px}
.brand-zh{font-size:var(--size-small);font-weight:var(--weight-medium);color:var(--text-muted)}
.desktop-nav{min-width:0}
.tabs{display:flex;align-items:center;height:var(--nav-height);list-style:none;margin:0;padding:0}
.tabs li{height:100%;flex-shrink:0}
.tabs a{position:relative;display:flex;align-items:center;height:100%;padding:0 13px;font-size:15px;font-weight:var(--weight-medium);color:var(--text-muted);white-space:nowrap}
.tabs a:hover{color:var(--text)}
.tabs a[aria-current="page"]{color:var(--text);font-weight:var(--weight-bold)}
.tabs a[aria-current="page"]::after{content:"";position:absolute;left:13px;right:13px;bottom:-1px;height:3px;border-radius:var(--radius-sm) var(--radius-sm) 0 0;background:var(--text)}
.nav-tools{display:flex;align-items:center;gap:12px;margin-left:auto;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-width:44px;width:auto;min-height:40px;padding:0 12px;border:0;border-radius:var(--radius-sm);background:transparent;color:var(--text);font-size:var(--size-small);font-weight:var(--weight-semibold);line-height:1;cursor:pointer}
.lang span{white-space:nowrap}
.lang:hover{background:var(--bg-panel-2)}
.lang svg{width:16px;height:16px}
.lang-caret{font-size:11px;color:var(--text-muted)}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:180px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-panel);padding:8px;list-style:none;z-index:35}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--radius-sm)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--bg-panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 22px;border-radius:var(--radius-sm);background:var(--ink);color:var(--white);font-size:var(--size-small);font-weight:var(--weight-bold);line-height:1;white-space:nowrap}
.btn-login:hover{background:var(--ink-hover)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text)}
.menu-toggle svg{width:22px;height:22px}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:0;background:var(--veil);z-index:20;border:0}
#site-header{position:relative;z-index:30}
.hero{position:relative;z-index:1;padding-top:40px;padding-bottom:48px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 48%;column-gap:56px;align-items:center}
.copy{position:relative;z-index:2;min-width:0}
.eyebrow{display:inline-flex;align-items:center;gap:10px;min-height:32px;max-width:100%;padding:5px 14px 5px 11px;border-radius:var(--radius-pill);background:var(--bg-panel);box-shadow:var(--shadow-chip);font-size:13px;font-weight:var(--weight-semibold);color:var(--text)}
.eyebrow-dot{width:8px;height:8px;border-radius:var(--radius-circle);background:var(--accent-dark);box-shadow:0 0 0 4px var(--accent-soft-2);flex-shrink:0}
.display{margin-top:24px;font-family:var(--font-display);font-size:var(--size-display);font-weight:var(--weight-display);line-height:1.1;letter-spacing:var(--tracking-display);color:var(--text)}
:lang(zh-CN) .display,:lang(zh-TW) .display,:lang(ja) .display,:lang(ko) .display{letter-spacing:var(--tracking-cjk)}
.kw{padding:0 .1em;margin:0 .02em;border-radius:var(--radius-md);background:linear-gradient(115deg,var(--accent-soft),var(--accent-soft-2));-webkit-box-decoration-break:clone;box-decoration-break:clone}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 26px;border:0;border-radius:var(--radius-sm);font-family:var(--font-body);font-size:var(--size-body);font-weight:var(--weight-bold);line-height:1;white-space:nowrap;flex-shrink:0;transition:background var(--duration-ui),color var(--duration-ui)}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--accent);color:var(--ink);box-shadow:var(--shadow-cta)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-hover)}
.btn-outline{border:1.5px solid var(--ink);background:transparent;color:var(--ink)}
.btn-outline:hover,.btn-outline.is-hover{background:var(--ink);color:var(--white)}
.btn-secondary{background:var(--ink);color:var(--white)}
.btn-secondary:hover{background:var(--ink-hover)}
.btn-light{background:var(--white);color:var(--ink)}
.btn-light:hover{background:var(--bg-panel-2)}
.btn.is-focus{outline:2px solid var(--accent-dark);outline-offset:4px}
.lede{max-width:34em;margin-top:24px;font-size:17px;line-height:1.72;color:var(--text-muted)}
.lede strong{color:var(--text);font-weight:var(--weight-bold)}
.facts{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px;padding:0;list-style:none}
.fact{display:inline-flex;align-items:center;gap:6px;min-height:30px;max-width:100%;padding:5px 12px;border-radius:var(--radius-pill);background:var(--bg-panel);box-shadow:var(--shadow-chip);font-size:13px;font-weight:var(--weight-semibold);color:var(--text)}
.fact svg{width:14px;height:14px;color:var(--accent-dark)}
.rails{margin-top:32px;padding-top:24px;border-top:1px solid var(--bg-panel-2)}
.rail+.rail{margin-top:16px}
.rail-label{margin-bottom:10px;font-size:var(--size-caption);font-weight:var(--weight-bold);letter-spacing:.08em;line-height:14px;color:var(--text-muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px;padding:0;list-style:none}
.chip{display:inline-flex;align-items:center;gap:7px;min-height:34px;max-width:100%;padding:5px 12px;border-radius:var(--radius-sm);background:var(--bg-panel);box-shadow:var(--shadow-chip);font-size:13px;font-weight:var(--weight-semibold);color:var(--text)}
.chip-ico{width:16px;height:16px;color:var(--text)}
.chip-flag{width:21px;height:14px;border-radius:calc(var(--radius-sm) / 3);overflow:hidden}
.reveal{transition:opacity var(--duration-reveal) var(--ease-ui),transform var(--duration-reveal) var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:160px;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.site-footer{position:relative;background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:48px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:32em;margin-top:16px;color:var(--text-muted)}
.footer-title{font-size:var(--size-body);font-weight:var(--weight-bold);margin-bottom:12px}
.footer-links{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 12px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;padding-block:4px}
.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 20px;margin-top:32px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:var(--size-small)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
@media(max-width:1300px) and (min-width:1101px){
  .nav-inner{gap:20px}
  .tabs a{padding-inline:9px;font-size:var(--size-small)}
  .nav-tools{gap:8px}
  .lang{padding-inline:8px}
}
@media(max-width:1180px){
  .hero-grid{grid-template-columns:minmax(0,1fr);row-gap:48px}
  .showcase{width:min(614px,100%);justify-self:center}
}
@media(max-width:1100px){
  .nav-inner{gap:0 24px;flex-wrap:wrap;padding-top:12px}
  .brand{height:48px}
  .desktop-nav{order:3;width:100%}
  .tabs{height:48px;overflow-x:auto;scrollbar-width:none}
  .tabs a[aria-current="page"]::after{bottom:0}
}
@media(max-width:768px){
  :root{--gutter:20px;--size-display:38px;--size-h2:28px;--size-h3:22px;--nav-height:68px;--toc-offset:12px;--toc-anchor:92px}
  .notice-inner{flex-wrap:wrap;gap:8px 12px;padding-top:8px;padding-bottom:8px;text-align:center}
  .notice-text{font-size:13px}
  .nav-inner{min-height:68px;padding-top:0;flex-wrap:nowrap;gap:12px}
  .desktop-nav{display:none}
  .nav-tools{margin-left:auto;gap:8px}
  .lang-text{display:none}
  .lang{padding-inline:8px;min-height:44px}
  .btn-login{min-height:44px;padding-inline:16px}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;left:0;right:0;top:100%;z-index:34;background:var(--bg-panel);padding:16px var(--gutter) 24px;max-height:calc(100dvh - 68px);overflow-y:auto;overscroll-behavior:contain;border-bottom:1px solid var(--border);box-shadow:var(--shadow-panel)}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px;border-radius:var(--radius-sm)}
  .mobile-drawer a[aria-current="page"],.mobile-drawer a:hover{background:var(--bg-panel-2)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:12px}
  .hero{padding-top:28px;padding-bottom:40px}
  .display{font-size:38px}
  .cta-row .btn{flex:1 1 auto;min-height:48px;padding-inline:18px;font-size:15px}
  .lede{font-size:var(--size-body)}
  .section{padding-top:40px;padding-bottom:40px}
  .grid-two,.grid-three,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{gap:32px}
  .panel,.card{padding:24px}
  .decorated,.stripe-halo{max-width:100%}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.decorative-tilt{transform:none}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{font-size:18px;gap:7px}
  .brand img{width:28px;height:28px}
  .nav-tools{gap:4px}
  .btn-login{padding-inline:12px}
  .display{font-size:34px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn{transition:none}
}