:root{
  --bg:#FBFAF8;--panel:#FFFFFF;--sunk:#F4F1EC;--soft:#F9F7F4;
  --border:#E8E3DC;--border-strong:#D8CFC4;
  --accent:#D7432F;--accent-2:#E8704F;--accent-dark:#A9301F;--accent-ink:#B5361F;
  --accent-tint:#FCE7E1;--accent-wash:#FDF1ED;--accent-line:rgba(215,67,47,.26);
  --text:#1F1B18;--muted:#6B635C;--success:#2F8F5B;--warn:#C98A12;--error:#B42318;
  --board-a:#FDE9E2;--board-b:#F8C9B8;--apricot:rgba(250,214,190,.62);
  --wash-06:rgba(215,67,47,.06);--clear:rgba(251,250,248,0);
  --glow-white:rgba(255,255,255,.58);--glow-white-soft:rgba(255,255,255,.32);--glow-white-0:rgba(255,255,255,0);
  --track:rgba(255,255,255,.66);--ring:rgba(31,27,24,.12);--veil:rgba(31,27,24,.28);
  --gold:#ECC05B;--gold-soft:#F5DB98;--dot-a:#E8704F;--dot-b:#F0A58C;
  --flag-red:#D0342A;--flag-navy:#1F2D66;--flag-white:#FFFFFF;
  --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;
  --r-xs:5px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-xl:20px;--r-phone:34px;--r-screen:26px;--r-pill:999px;--r-circle:50%;
  --shadow-chip:0 1px 2px rgba(31,27,24,.04);
  --shadow-board:0 40px 90px -46px rgba(215,67,47,.34);
  --shadow-win:inset 0 1px 0 #FFFFFF,0 30px 70px -26px rgba(215,67,47,.14),0 12px 28px -16px rgba(215,67,47,.10),0 1px 3px rgba(31,27,24,.05);
  --shadow-phone:0 38px 64px -20px rgba(169,48,31,.30),0 12px 24px -12px rgba(31,27,24,.20),inset 0 1px 0 #FFFFFF;
  --shadow-float:0 16px 32px -12px rgba(215,67,47,.24),0 2px 6px rgba(31,27,24,.06),inset 0 1px 0 #FFFFFF;
  --shadow-card:0 10px 22px -14px rgba(215,67,47,.22),0 1px 2px rgba(31,27,24,.05);
  --shadow-cta:inset 0 1px 0 rgba(255,255,255,.26),inset 0 -2px 0 rgba(169,48,31,.28),0 14px 28px rgba(215,67,47,.12),0 5px 12px -3px rgba(215,67,47,.30);
  --shadow-tick:0 3px 8px rgba(215,67,47,.28);
  --shadow-go:0 12px 22px -6px rgba(215,67,47,.42),inset 0 1px 0 rgba(255,255,255,.3);
  --shadow-login:0 8px 18px -10px var(--ring);
  --grad-accent:linear-gradient(135deg,var(--accent) 0%,var(--accent-2) 100%);
  --gutter:48px;--content-width:1280px;--head-height:76px;--anchor-offset:92px;--toc-offset:88px;--toc-landing:164px;
  --text-base:16px;--text-small:14px;--text-display:66px;--text-section:36px;
  --weight-normal:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-heavy:800;
  --ease-ui:.2s ease;--ease-reveal:.35s ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);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}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,summary,a{-webkit-tap-highlight-color:var(--clear)}
button{color:inherit}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
p{margin:0}
ul,dl,dd{margin:0;padding:0}
ul{list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-heavy);text-wrap:balance}
h1{font-size:clamp(52px,4.6vw,68px);line-height:1.12;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:clamp(30px,3vw,40px);line-height:1.25;letter-spacing:-.02em;margin:0 0 20px}
h3{font-size:22px;line-height:1.35;margin:0 0 12px}
:focus-visible{outline:2px solid var(--accent-ink);outline-offset:3px;border-radius:var(--r-sm)}
[hidden]{display:none!important}
.wrap{width:100%;max-width:calc(var(--content-width) + var(--gutter)*2);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:80px;padding-bottom:80px}
.section-head{max-width:720px;margin-bottom:32px}
.section-head p,.muted{color:var(--muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.stack{display:grid;gap:20px;min-width:0}
.card,.panel{min-width:0;padding:28px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-card)}
.panel-sunk{background:var(--sunk)}
.no-break{white-space:nowrap}
.skip-link{position:absolute;left:16px;top:-64px;z-index:100;padding:8px 14px;border-radius:var(--r-sm);background:var(--text);color:var(--panel);text-decoration:none;font-size:var(--text-small)}
.skip-link:focus{top:12px}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--sunk);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
.prose{min-width:0;max-width:80ch}
.prose p,.prose ul,.prose ol,.prose blockquote{margin-bottom:20px}
.prose ul{list-style:disc;padding-left:1.4em}
.prose ol{padding-left:1.5em}
.prose li+li{margin-top:8px}
.prose h2{margin-top:48px}
.prose h3{margin-top:28px}
.prose a{color:var(--accent-ink)}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.reveal{transition:opacity var(--ease-reveal),transform var(--ease-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:grid;min-width:0;min-height:64px;width:100%;max-width:100%;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
.counter-value,[data-stat]{display:inline-block;min-width:3ch;font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:12px 30px;border:1px solid var(--clear);border-radius:var(--r-md);text-decoration:none;font-family:var(--font-display);white-space:nowrap;flex-shrink:0;transition:transform var(--ease-ui),box-shadow var(--ease-ui),background-color var(--ease-ui)}
.btn-primary{background:var(--grad-accent);color:var(--panel);font-size:19px;font-weight:var(--weight-heavy);letter-spacing:.02em;box-shadow:var(--shadow-cta)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-primary:active{transform:translateY(1px);box-shadow:var(--shadow-chip)}
.btn svg{width:18px;height:18px}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--text);border-color:var(--border-strong);font-size:17px;font-weight:var(--weight-semibold);box-shadow:var(--shadow-chip)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--muted)}
.btn-small{min-height:44px;padding:9px 18px;font-size:var(--text-small)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:32px}
#site-header{min-height:var(--head-height);position:relative;z-index:50}
.site-head{position:relative;z-index:50}
.head-row{display:flex;align-items:center;flex-wrap:nowrap;gap:28px;height:var(--head-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;color:var(--text);font-family:var(--font-display);font-size:21px;font-weight:var(--weight-heavy);letter-spacing:-.02em}
.brand-mark{display:block;width:34px;height:34px;flex:none}
.main-nav{margin-left:auto;flex:1;min-width:0}
.nav-list{display:flex;align-items:center;justify-content:center;gap:2px;list-style:none;margin:0;padding:5px;border-radius:var(--r-pill);background:var(--track);border:1px solid var(--border);box-shadow:var(--shadow-chip);width:max-content;max-width:100%;margin-left:auto}
.nav-item{display:block;padding:7px 16px;border-radius:var(--r-pill);color:var(--muted);text-decoration:none;font-size:15px;font-weight:var(--weight-medium);line-height:1.5;white-space:nowrap;transition:color var(--ease-ui),background-color var(--ease-ui)}
.nav-item:hover{color:var(--text)}
.nav-item[aria-current="page"]{background:var(--accent-tint);color:var(--accent-ink);font-weight:var(--weight-bold)}
.head-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-box{position:relative}
.lang-switch{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;height:40px;padding:0 12px;border:1px solid var(--clear);border-radius:var(--r-pill);background:none;color:var(--text);font:var(--weight-medium) 14.5px/1 var(--font-body);white-space:nowrap}
.lang-switch:hover{border-color:var(--border);background:var(--panel)}
.lang-switch svg{width:16px;height:16px;color:var(--muted)}
.lang-label{white-space:nowrap}
.lang-caret{font-size:11px;color:var(--muted)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:80;min-width:176px;padding:6px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm);font-size:var(--text-small)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-wash);color:var(--accent-ink)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:40px;padding:0 20px;border-radius:var(--r-md);background:var(--text);color:var(--panel);text-decoration:none;font-size:15px;font-weight:var(--weight-bold);white-space:nowrap;box-shadow:var(--shadow-login);transition:transform var(--ease-ui)}
.login-btn svg{width:15px;height:15px}
.login-btn: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;padding:10px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-xs)}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.footer{padding-top:56px;padding-bottom:28px;background:var(--soft);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand{min-width:0}
.footer-brand p{margin-top:18px;max-width:30em;color:var(--muted);font-size:var(--text-small)}
.footer-title{font-size:var(--text-small);font-weight:var(--weight-bold);margin-bottom:16px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);font-size:var(--text-small);text-decoration:none}
.footer-links a:hover{color:var(--accent-ink)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-small);text-decoration:none;color:var(--muted)}
.footer-languages a[aria-current="true"]{color:var(--accent-ink);font-weight:var(--weight-bold)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
@media(min-width:1600px){.main-nav{flex:none}.head-tools{margin-left:0}}
@media(max-width:1200px){
  .head-row{gap:16px}.nav-item{padding-inline:10px;font-size:14px}.lang-switch{padding-inline:8px}
}
@media(max-width:1080px){
  :root{--gutter:32px}
  .main-nav{display:none}.head-tools{margin-left:auto}.menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:fixed;inset:var(--head-height) 0 auto;z-index:60;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--panel);border-top:1px solid var(--border)}
  .mobile-drawer ul{display:grid;gap:4px}
  .mobile-drawer a{display:flex;align-items:center;min-height:48px;width:100%;padding:12px 16px;border-radius:var(--r-md);text-decoration:none}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"],.mobile-drawer a[aria-current="true"]{background:var(--accent-wash);color:var(--accent-ink)}
  .drawer-languages{margin-top:20px;padding-top:20px;border-top:1px solid var(--border)}
  .nav-veil:not([hidden]){display:block;position:fixed;inset:var(--head-height) 0 0;z-index:55;background:var(--veil);border:0;width:100%}
  html.nav-open .site-head{position:fixed;inset:0 0 auto;background:var(--bg);z-index:70}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  h2{font-size:30px}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-three,.grid-two{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .tilt,.phone{transform:none}
  .top,.hero-stage,.feature-board{max-width:100%;overflow-x:clip}
  .head-row{gap:8px}.brand{font-size:18px;gap:7px}.brand-mark{width:28px;height:28px}
  .head-tools{gap:4px;margin-left:auto}
  .lang-switch{font-size:12px;padding-inline:6px;gap:4px}
  .lang-switch svg{display:none}
  .login-btn{padding-inline:12px;font-size:14px}
  .card,.panel{padding:20px}
  .btn{padding-inline:22px}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{font-size:16px;gap:5px}.brand-mark{width:25px;height:25px}
  .lang-switch{font-size:11px;padding-inline:4px}
  .login-btn{padding-inline:9px}.head-row{gap:5px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}