:root{
  color-scheme:light;
  --bg:#E9EEF8;--bg-panel:#F7F9FE;--bg-panel-2:#DDE4F3;
  --border:#C9D3E8;--border-soft:rgba(201,211,232,.65);
  --accent:#1E8C6E;--accent-dark:#136650;--on-accent:#FFFFFF;
  --text:#1C2134;--text-muted:#596179;--success:#2E9E5B;--warn:#C4870F;--error:#D2434F;
  --mist-pink:#F6D9E8;--mist-sky:#D3E3FB;--mist-cream:#FBEFC8;
  --hero-top:#EEF2FB;--hero-bottom:#F0DDEA;
  --rib-pink:#EE9DC1;--rib-pink-2:#F5C3DA;--rib-sky:#85ACEE;--rib-sky-2:#B9D1F7;--rib-mint:#7CD2BA;--rib-mint-2:#BDEADC;
  --rt-top:#C9CFF5;--rt-top-hi:#E0E3FA;--rt-front-a:#A9C6F2;--rt-front-b:#8FB0EC;--rt-side-a:#7E9BDB;--rt-side-b:#6C88CF;--rt-ink:#4F67B3;--rt-vent:#5B70B4;
  --lt-mint:#B4F2DD;--lt-sky:#EEF4FF;--lt-pink:#FFD6E8;--lt-cream:#FFF1C6;
  --plane:#FFFFFF;--plane-fold:#D5DAF7;--plane-edge:#A3AEE3;
  --flag-red:#D2434F;--flag-navy:#2C3A78;--flag-white:#FFFFFF;--flag-edge:rgba(28,33,52,.14);
  --glass:rgba(247,249,254,.62);--glass-head:rgba(247,249,254,.88);--glass-edge:rgba(255,255,255,.85);
  --hi:rgba(255,255,255,.92);--hi-soft:rgba(255,255,255,.22);--emboss:rgba(255,255,255,.5);
  --card-edge:rgba(201,211,232,.72);--seg-trough:rgba(201,207,245,.6);--mint-ring:rgba(124,210,186,.3);
  --shadow-sky:rgba(79,124,214,.12);--shadow-sky-soft:rgba(79,124,214,.08);--shadow-jade:rgba(30,140,110,.12);--shadow-jade-tight:rgba(19,102,80,.22);--shadow-ink:rgba(28,33,52,.06);--shadow-router:rgba(98,140,226,.34);
  --glow-white:rgba(247,249,254,.85);--glow-cream:rgba(251,231,174,.5);--glow-pink:rgba(246,196,220,.55);--glow-sky:rgba(190,212,250,.55);--dot:rgba(28,33,52,.06);
  --font-display:"Iowan Old Style",Georgia,"Songti SC","STSongti-SC-Bold","Source Han Serif SC","Noto Serif CJK SC","Noto Sans SC",serif;
  --font-body:Inter,"Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-sm:6px;--r-md:8px;--r-card:10px;--r-lg:12px;--r-pill:999px;--r-round:50%;
  --gutter:48px;--page-max:1408px;--header-height:72px;--anchor-offset:96px;--toc-offset:152px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-5:40px;--space-6:48px;--space-8:64px;--space-9:72px;--space-10:80px;--space-12:96px;
  --size-body:16px;--size-small:14px;--size-h1:clamp(52px,calc(4.2vw + 4px),64px);--size-h2:36px;--size-h3:22px;
  --ease-out:cubic-bezier(.2,.7,.2,1);--time-ui:.2s;--time-reveal:.6s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
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;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(--mint-ring)}
button{color:inherit}
img,svg{display:block;max-width:100%;flex-shrink:0}
img{height:auto}
svg{overflow:visible}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
::selection{background:var(--rib-mint-2);color:var(--text)}
.wrap{width:100%;max-width:var(--page-max);margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*{min-width:0}
.section{padding-top:var(--space-8);padding-bottom:var(--space-8)}
.section-tight{padding-top:var(--space-4);padding-bottom:var(--space-4)}
h1,h2,h3{font-family:var(--font-display);font-weight:700;line-height:1.25;letter-spacing:-.02em;text-wrap:balance;overflow-wrap:break-word}
h1,.h1{font-size:var(--size-h1);line-height:1.14}
h2{font-size:var(--size-h2)}
h3{font-size:var(--size-h3)}
h1,h2,h3,p{margin-top:0}
p{margin-bottom:var(--space-3)}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono,code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em;background:var(--bg-panel-2);border-radius:var(--r-sm);padding:.12em .3em}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--bg-panel-2);border-radius:var(--r-md)}
pre code{padding:0;white-space:pre;overflow-wrap:normal;background:transparent}
.prose{max-width:78ch;min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:var(--space-8)}
.prose h3{margin-top:var(--space-5)}
.prose p,.prose li{line-height:1.85}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:.2em}
.prose section{min-width:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.panel,.card{background:var(--bg-panel);border:1px solid var(--card-edge);border-radius:var(--r-card);padding:var(--space-4);box-shadow:0 16px 40px var(--shadow-sky),inset 0 1px 0 var(--hi);min-width:0}
.panel-inset{background:var(--bg-panel-2);border-radius:var(--r-md);padding:var(--space-3)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.card-grid>*{min-width:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:14px 26px;border:1px solid transparent;border-radius:var(--r-md);font-family:var(--font-body);font-size:16px;font-weight:600;line-height:1.35;white-space:nowrap;flex-shrink:0;transition:transform var(--time-ui) var(--ease-out),background var(--time-ui)}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:18px;height:18px}
.btn-main,.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:0 12px 40px var(--shadow-jade),0 2px 6px var(--shadow-jade-tight),inset 0 1px 0 var(--hi-soft)}
.btn-main:hover,.btn-primary:hover,.btn-demo-hover{background:var(--accent-dark)}
.btn-sub,.btn-secondary{background:var(--glass);color:var(--text);border-color:var(--border);box-shadow:inset 0 1px 0 var(--hi)}
.btn-sub:hover,.btn-secondary:hover{border-color:var(--text-muted)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.btn-small{min-height:44px;font-size:var(--size-small);padding:10px 18px}
.btn-demo-focus{outline:2px solid var(--accent-dark);outline-offset:3px}
.ico-line{fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.top{position:relative;z-index:30;background:var(--glass-head);border-bottom:1px solid var(--border-soft);backdrop-filter:blur(12px)}
.top-in{position:relative;display:flex;align-items:center;gap:24px;min-height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-height:44px}
.brand-mark{width:30px;height:30px}
.brand-name{font-size:20px;font-weight:700;letter-spacing:-.01em}
.brand-zh{font-weight:500;color:var(--text-muted)}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav-tray{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0;background:var(--bg);border:1px solid var(--border-soft);border-radius:var(--r-pill);box-shadow:inset 0 1px 2px var(--shadow-ink)}
.nav-tray li:first-child{margin-left:4px}
.nav-tray li:last-child{margin-right:4px}
.nav-tray a{display:flex;align-items:center;justify-content:center;min-height:38px;margin-block:4px;padding:7px 15px;border-radius:var(--r-pill);font-size:14.5px;line-height:1.4;color:var(--text-muted);white-space:nowrap}
.nav-tray a:hover{color:var(--text)}
.nav-tray a[aria-current="page"]{background:var(--bg-panel);color:var(--text);font-weight:600;box-shadow:0 1px 2px var(--shadow-ink),0 6px 18px var(--shadow-sky),inset 0 0 0 1px var(--hi)}
.acts{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:40px;padding:0 12px;border:0;border-radius:var(--r-md);background:transparent;font-size:14px;color:var(--text-muted);white-space:nowrap}
.lang:hover{background:var(--bg)}
.lang svg{width:16px;height:16px}
.lang-caret{font-size:11px}
.lang-menu{position:absolute;right:0;top:calc(100% + 12px);width:max-content;min-width:176px;max-width:calc(100vw - 32px);padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:0 12px 40px var(--shadow-sky)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 16px;border-radius:var(--r-sm)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--bg-panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 20px;border-radius:var(--r-md);background:var(--bg-panel);border:1px solid var(--border);font-size:14.5px;font-weight:600;white-space:nowrap;box-shadow:0 1px 2px var(--shadow-ink),inset 0 1px 0 var(--hi)}
.login:hover{border-color:var(--text-muted)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel)}
.menu-toggle svg{width:20px;height:20px}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:20;border:0;background:var(--shadow-ink)}
.footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:var(--space-8);padding-bottom:var(--space-4)}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr 1fr;gap:var(--space-5)}
.footer-grid>*{min-width:0}
.footer-intro{margin-top:var(--space-2);max-width:28em;color:var(--text-muted);font-size:var(--size-small)}
.footer-title{font-family:var(--font-body);font-size:var(--size-small);margin:0 0 16px}
.footer-links{display:grid;gap:4px;list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--size-small);overflow-wrap:anywhere}
.footer-links a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:var(--space-6);padding-top:var(--space-3);border-top:1px solid var(--border);font-size:var(--size-small);color:var(--text-muted)}
.legal-links{display:flex;flex-wrap:wrap;gap:24px}
.legal-links a{display:inline-flex;align-items:center;min-height:32px}
.reveal{transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.decor-section,.hero,.stripe-halo{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-height:96px;width:100%;max-width:100%;overflow:hidden;margin-block:var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
@media(min-width:1101px) and (max-width:1250px){
  .top-in{gap:12px}.nav-tray a{padding-inline:10px}.acts{gap:4px}.lang{padding-inline:8px}
}
@media(max-width:1100px){
  .nav{display:none}
  .acts{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;z-index:2;left:var(--gutter);right:var(--gutter);top:100%;padding:16px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:0 20px 40px var(--shadow-sky);max-height:calc(100dvh - var(--header-height) - 16px);overflow-y:auto;overscroll-behavior:contain}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-md)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--bg-panel-2)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:8px;padding-top:8px}
}
@media(max-width:768px){
  :root{--gutter:20px;--size-h1:clamp(28px,8.4vw,40px);--size-h2:28px;--space-8:48px}
  .card-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .decor-section,.stripe-halo{max-width:100%}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .brand-name{font-size:18px}
  .top-in{gap:8px}
  .acts{gap:4px;margin-left:auto}
  .login{padding-inline:12px}
  .lang{padding-inline:6px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .cta-row .btn{flex:1 1 140px}
  .panel,.card{padding:24px}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{gap:6px}.brand-mark{width:26px;height:26px}
  .lang-caret{display:none}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn{transition:none}.btn:hover{transform:none}
}