:root{
  --bg:#FAF3E5;
  --hero-top:#FDF8EE;
  --hero-bottom:#F3E9D6;
  --panel:#FFFBF3;
  --panel-2:#F1E7D4;
  --ped-back:#F6EDDC;
  --line:#E3D6BE;
  --line-soft:rgba(227,214,190,.72);
  --line-strong:#CDBC9F;
  --accent:#2350D8;
  --accent-dark:#17359A;
  --violet:#7A4CF0;
  --coral:#F0782A;
  --cyan:#6FDCE8;
  --ink:#241C14;
  --ink-strong:#16110B;
  --ink-hover:#2F261C;
  --ink-muted:#6E6152;
  --ink-quiet:#9C8D78;
  --success:#2F8F55;
  --warn:#C9821B;
  --error:#C23B2E;
  --chip:#EBE1CF;
  --chip-hover:#E1D4BD;
  --white:#FFFFFF;
  --glass-tint:#C9D4FF;
  --arc-top-a:#7D99F4;
  --arc-top-b:#B29AFA;
  --candy-blue:#DCE5FB;
  --candy-violet:#ECE3FC;
  --candy-coral:#FCE3D3;
  --flag-red:var(--error);
  --flag-blue:var(--accent-dark);
  --flag-white:var(--panel);
  --grid-line:rgba(36,28,20,.04);
  --glow:rgba(35,80,216,.085);
  --ring-dot:rgba(35,80,216,.14);
  --veil:rgba(36,28,20,.36);
  --shadow-blue:rgba(35,80,216,.12);
  --mask-solid:#000000;
  --clear:transparent;
  --sh-panel:inset 0 1px 0 rgba(255,255,255,.92),0 1px 2px rgba(36,28,20,.04),0 18px 42px -20px rgba(35,80,216,.20);
  --sh-float:inset 0 1px 0 rgba(255,255,255,.95),0 2px 4px rgba(36,28,20,.04),0 20px 44px -16px rgba(35,80,216,.24);
  --sh-rig:0 20px 36px var(--shadow-blue);
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','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,'Noto Sans SC',monospace;
  --r-btn:2px;
  --r-sm:4px;
  --r-md:6px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:56px;
  --content-max:1440px;
  --reading-max:820px;
  --head-height:92px;
  --anchor-space:108px;
  --toc-space:92px;
  --ease:ease;
  --fast:.2s;
  --reveal-time:.35s;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-space)}
body{background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary{touch-action:manipulation}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);font-weight:800;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.45vw,64px);line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);line-height:1.25;letter-spacing:-.02em}
h3{font-size:22px;line-height:1.4}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--line);border-radius:var(--r-sm);font-size:13px}
pre code{white-space:pre;overflow-wrap:normal}
input,select,textarea{max-width:100%;padding:12px;border:1px solid var(--line-strong);border-radius:var(--r-sm);background:var(--panel)}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{margin-bottom:32px;max-width:780px}
.section-head p{margin-top:16px;color:var(--ink-muted)}
.grid-2,.grid-3,.grid-5{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid-2>*,.grid-3>*,.grid-5>*,.hero-grid>*{min-width:0}
.stack>*+*{margin-top:20px}
.mono-label{font-family:var(--font-mono);font-size:12px;line-height:1.5;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-muted)}
.muted{color:var(--ink-muted)}
.panel,.card{min-width:0;padding:28px;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--r-md);box-shadow:var(--sh-panel)}
.prose{min-width:0;overflow-wrap:break-word;line-height:1.85}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:14px}
.prose p,.prose ul,.prose ol,.prose pre,.prose table{margin-bottom:20px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{list-style:decimal;padding-left:24px}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose li+li{margin-top:8px}
.prose code:not(pre code){padding:2px 5px;background:var(--panel-2);border-radius:var(--r-btn)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:54px;padding:12px 30px;font-family:var(--font-mono);font-size:15px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;border:1px solid var(--clear);border-radius:var(--r-btn);transition:background-color var(--fast) var(--ease),transform var(--fast) var(--ease);white-space:nowrap;flex-shrink:0;text-align:center}
.btn:hover{transform:translateY(-1px)}
.btn-solid,.btn-primary{background:var(--ink-strong);color:var(--panel)}
.btn-solid:hover,.btn-primary:hover{background:var(--ink-hover)}
.btn-soft,.btn-secondary{background:var(--chip);color:var(--ink)}
.btn-soft:hover,.btn-secondary:hover{background:var(--chip-hover)}
.btn-outline{border-color:var(--line-strong);background:var(--panel);color:var(--ink)}
.btn-outline:hover{background:var(--panel-2)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--ink-muted);border-color:var(--line);transform:none}
.btn[aria-disabled="true"]{pointer-events:none}
.btn-small{min-height:44px;padding:10px 18px;font-size:13px;letter-spacing:.06em}
.cta-row{display:flex;gap:12px;margin-top:36px}
.stage{position:relative;background:linear-gradient(180deg,var(--hero-top) 0%,var(--hero-bottom) 100%);overflow-x:clip;max-width:100%}
.stage::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(var(--grid-line) 1px,var(--clear) 1px),linear-gradient(90deg,var(--grid-line) 1px,var(--clear) 1px);background-size:48px 48px;background-position:center top;-webkit-mask-image:radial-gradient(ellipse 74% 66% at 50% 46%,var(--mask-solid) 38%,var(--clear) 84%);mask-image:radial-gradient(ellipse 74% 66% at 50% 46%,var(--mask-solid) 38%,var(--clear) 84%)}
.stage::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse 36% 44% at 79% 22%,var(--glow),var(--clear) 72%)}
#site-header{position:relative;z-index:50}
.site-head{position:relative;z-index:53;display:flex;align-items:center;gap:12px;padding-top:16px;padding-bottom:16px}
.head-bar{flex:1;min-width:0;display:flex;align-items:center;justify-content:space-between;gap:24px;height:60px;padding:0 22px 0 16px;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--r-md);box-shadow:var(--sh-panel)}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--ink-strong);flex-shrink:0}
.brand img{width:32px;height:32px;flex-shrink:0}
.brand-zh{font-size:14px;font-weight:500;color:var(--ink-muted)}
.nav{flex:1;min-width:0}
.nav-list{display:flex;align-items:center;justify-content:flex-end;list-style:none;margin:0;padding:0}
.nav-list li{display:flex;align-items:center}
.nav-list li+li::before{content:"·";margin:0 11px;color:var(--ink-quiet);font-weight:700}
.nav-list a{display:inline-flex;align-items:center;min-height:32px;padding:6px 0;font-size:14.5px;font-weight:500;color:var(--ink-muted);white-space:nowrap;transition:color var(--fast) var(--ease)}
.nav-list a:hover{color:var(--ink-strong)}
.nav-list a[aria-current="page"]{color:var(--ink-strong);font-weight:700;box-shadow:inset 0 -2px 0 var(--accent)}
.head-side{position:relative;display:flex;align-items:center;gap:4px;height:60px;padding:0 10px 0 6px;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--r-md);box-shadow:var(--sh-panel);flex-shrink:0}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:40px;padding:0 14px;font-size:13.5px;font-weight:500;color:var(--ink-muted);border-radius:var(--r-sm);white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--ink)}
.lang span{font-size:10px;color:var(--ink-quiet);white-space:nowrap}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:60;min-width:180px;padding:6px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--sh-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 14px;font-size:14px;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent-dark)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 20px;background:var(--ink-strong);color:var(--panel);font-family:var(--font-mono);font-size:13.5px;font-weight:600;letter-spacing:.14em;border-radius:var(--r-btn);white-space:nowrap}
.btn-login:hover{background:var(--ink-hover)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(6px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] .menu-line:last-child{transform:translateY(-6px) rotate(-45deg)}
.mobile-drawer{position:fixed;top:var(--head-height);right:0;left:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));z-index:52;background:var(--panel);padding:16px var(--gutter) 32px;overflow-y:auto;overscroll-behavior:contain;border-top:1px solid var(--line)}
.mobile-drawer a{display:flex;align-items:center;min-height:44px;width:100%;padding:12px 16px;border-bottom:1px solid var(--line-soft)}
.mobile-drawer a[aria-current]{color:var(--accent-dark);background:var(--panel-2)}
.drawer-languages{margin-top:20px}
.menu-veil{position:fixed;inset:var(--head-height) 0 0;z-index:51;background:var(--veil)}
html.nav-open{overflow:hidden}
.header-live>.brand{height:60px;padding-left:16px;padding-right:16px;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--r-md);box-shadow:var(--sh-panel)}
.header-live>.nav{height:60px;display:flex;align-items:center;justify-content:flex-end;padding:0 16px;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--r-md);box-shadow:var(--sh-panel)}
.hero{position:relative;z-index:1;padding-top:64px;padding-bottom:56px}
.hero-grid{display:grid;grid-template-columns:minmax(0,46fr) minmax(0,54fr);gap:32px;align-items:center}
.hero-copy{position:relative;z-index:2}
.eyebrow{display:inline-flex;align-items:center;gap:10px;min-height:32px;padding:4px 14px 4px 12px;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--r-sm);box-shadow:var(--sh-panel);font-size:13.5px;font-weight:600;color:var(--ink)}
.eyebrow-dot{width:8px;height:8px;border-radius:var(--r-round);background:var(--accent);box-shadow:0 0 0 4px var(--ring-dot);flex-shrink:0}
.display{margin-top:28px;font-family:var(--font-display);font-weight:800;font-size:clamp(52px,4.45vw,64px);line-height:1.08;letter-spacing:-.03em;color:var(--ink-strong)}
.display>span{display:block}
.h1-a{color:var(--ink-strong)}
.h1-b{color:var(--ink-quiet)}
.lede{margin-top:32px;max-width:34em;font-size:17px;line-height:1.76;color:var(--ink-muted)}
.lede strong{color:var(--ink);font-weight:700}
.assure{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:24px}
.assure li{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:var(--ink);white-space:nowrap}
.assure svg{width:12px;height:12px;flex-shrink:0;color:var(--accent)}
.assure li::before{content:"✓";color:var(--accent);font-family:var(--font-mono);flex-shrink:0}
.assure li:has(svg)::before{content:none}
.wall{margin-top:56px;border-top:1px solid var(--line)}
.wall-row{display:grid;grid-template-columns:168px minmax(0,1fr);align-items:center;padding-top:16px;padding-bottom:16px}
.wall-row+.wall-row{border-top:1px solid var(--line-soft)}
.wall-tag{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;font-weight:600;letter-spacing:.16em;color:var(--ink)}
.wall-tag::before{content:"";width:6px;height:6px;background:var(--ink);flex-shrink:0}
.pf-row{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));align-items:center}
.pf-row li{display:inline-flex;align-items:center;gap:10px;font-size:15px;font-weight:600;letter-spacing:-.01em;color:var(--ink-muted);min-width:0}
.pf-row svg{width:20px;height:20px;flex-shrink:0}
.flag-row{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));align-items:center}
.flag-row li{display:inline-flex;align-items:center;gap:10px;font-size:14.5px;font-weight:600;color:var(--ink-muted);min-width:0}
.flag{width:27px;height:18px;flex-shrink:0;display:block;overflow:hidden;border-radius:var(--r-btn)}
.site-footer{position:relative;background:var(--panel-2);border-top:1px solid var(--line);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.25fr) repeat(2,minmax(0,1fr));gap:48px}
.footer-brand{min-width:0}
.footer-brand p{max-width:32em;margin-top:20px;color:var(--ink-muted);font-size:14px;line-height:1.85}
.footer-title{font-family:var(--font-mono);font-size:13px;font-weight:600;letter-spacing:.08em;margin-bottom:14px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--ink-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px;padding-top:20px;border-top:1px solid var(--line-strong)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:20px;font-family:var(--font-mono);font-size:12px;color:var(--ink-muted)}
.footer-legal{display:flex;gap:20px}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--ease)}
.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%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
@media(min-width:1360px){.assure{flex-wrap:nowrap}}
@media(max-width:1280px){
  .header-live{gap:8px}
  .header-live>.nav{padding-inline:12px}
  .header-live .nav-list li+li::before{margin-inline:6px}
  .header-live .nav-list a{font-size:13px}
}
@media(max-width:1180px){
  :root{--gutter:32px}
  .nav-list a{font-size:13.5px}
  .nav-list li+li::before{margin-inline:7px}
  .head-bar{gap:16px}
}
@media(max-width:1100px){
  .nav,.header-live>.nav{display:none}
  .menu-toggle{display:inline-flex}
  .head-side{margin-left:auto}
  .header-live>.brand{border:0;box-shadow:none;background:var(--clear);padding-left:0;padding-right:0}
  .site-head{justify-content:space-between}
  .footer-grid{gap:28px}
}
@media(max-width:768px){
  h1,.display{font-size:clamp(28px,5.2vw,40px)}
  .hero{padding-top:40px;padding-bottom:40px}
  .hero-grid{grid-template-columns:minmax(0,1fr);gap:40px}
  .wall{margin-top:40px}
  .wall-row{grid-template-columns:minmax(0,1fr);gap:14px}
  .pf-row,.flag-row{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
  .head-side>.lang{display:none}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-3,.grid-5{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .display{font-size:clamp(30px,9vw,40px)}
  .cta-row{flex-wrap:wrap}
  .cta-row .btn{flex:1 1 auto;padding-inline:20px}
  .lede{font-size:16px}
  .assure li{white-space:normal}
  .pf-row,.flag-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-2,.grid-3,.grid-5{grid-template-columns:minmax(0,1fr)}
  .panel,.card{padding:20px}
  .head-bar{padding-inline:10px;height:60px}
  .brand{font-size:17px;gap:7px}
  .brand img{width:28px;height:28px}
  .btn-login{padding-inline:14px;font-size:12px}
  .head-side{padding-inline:4px;gap:0}
  .site-head{flex-wrap:nowrap;gap:8px}
  .tilt,.tilt-card,[data-tilt]{transform:none}
  .stage,.hero{max-width:100%}
  .reading-wrap{padding-inline:var(--gutter)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.btn:hover{transform:none;transition:none}
}