:root{
  --bg:#F8F0E2;--bg-top:#FCF7EE;--bg-bottom:#F3E8D5;--panel:#FFFBF4;--panel-2:#F0E5D2;--border:#E3D5BE;
  --accent:#0B8F72;--accent-dark:#06654F;--accent-hi:#17A787;--text:#2A2018;--muted:#6E5F4E;
  --success:#1E9E5A;--warn:#C98A12;--error:#D2453E;--coral:#F0708E;--violet:#8A4FE0;--violet-ink:#6A3AC2;--lavender:#CDB8F5;
  --coral-tint:#FAD9DF;--lav-tint:#E6DAFA;--white:#FFFFFF;--clear:transparent;
  --panel-a82:rgba(255,251,244,.82);--panel-a70:rgba(255,251,244,.7);--glass:rgba(255,251,244,.58);
  --panel2-a55:rgba(240,229,210,.55);--panel2-a85:rgba(240,229,210,.85);
  --white-a30:rgba(255,255,255,.3);--white-a70:rgba(255,255,255,.7);--white-a90:rgba(255,255,255,.9);
  --accent-a08:rgba(11,143,114,.08);--accent-a10:rgba(11,143,114,.10);--accent-a12:rgba(11,143,114,.12);
  --accent-a18:rgba(11,143,114,.18);--accent-a30:rgba(11,143,114,.30);--accent-a45:rgba(11,143,114,.45);
  --coral-a35:rgba(240,112,142,.35);--violet-a06:rgba(138,79,224,.06);--violet-a12:rgba(138,79,224,.12);
  --lav-a30:rgba(205,184,245,.30);--lav-a45:rgba(205,184,245,.45);
  --ink-a06:rgba(42,32,24,.06);--ink-a10:rgba(42,32,24,.10);--ink-a16:rgba(42,32,24,.16);--veil:rgba(42,32,24,.35);
  --flag-red:#D8343C;--flag-white:#FFFFFF;--flag-navy:#22306B;--flag-blue:#2D3D80;
  --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-xl:28px;--r-lg:24px;--r-md:16px;--r-sm:12px;--r-xs:8px;--r-pill:999px;--r-round:50%;--r-logo:10px;
  --sh-win:inset 0 1px 0 var(--white-a90),0 52px 96px -34px var(--accent-a12),0 20px 40px -20px var(--accent-a12),0 2px 6px var(--ink-a06);
  --sh-sheet:0 24px 48px -26px var(--accent-a12);
  --sh-float:inset 0 1px 0 var(--white-a90),0 30px 60px -22px var(--accent-a12),0 10px 22px -12px var(--ink-a10);
  --sh-btn:inset 0 1px 0 var(--white-a30),0 16px 30px -14px var(--accent-a45);
  --sh-soft:0 10px 24px -14px var(--accent-a18);
  --sh-card:inset 0 1px 0 var(--white-a90),0 28px 60px -28px var(--accent-a10);
  --gutter:48px;--page-width:1280px;--header-height:72px;--anchor-gap:88px;--toc-offset:16px;--toc-landing:104px;
  --size-h1:clamp(52px,4.6vw,66px);--size-h2:clamp(28px,3.3vw,44px);--size-h3:24px;
  --weight-display:800;--weight-strong:700;--weight-medium:600;--weight-body:400;
  --tracking-display:-.03em;--tracking-cjk:-.02em;--tracking-label:.04em;
  --ease:180ms ease;--reveal-time:350ms;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;min-height:100vh;font-family:var(--font-body);font-size:16px;line-height:1.6;color:var(--text);background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 46%,var(--bg-bottom) 100%);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.035;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.86' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath filter='url(%23n)' d='M0 0h160v160H0z'/%3E%3C/svg%3E");mix-blend-mode:multiply}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,select,input,textarea{max-width:100%}
button{border:0}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
p{margin:0 0 20px}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:1.12;letter-spacing:var(--tracking-display);margin:0 0 24px}
:lang(zh-CN) h1,:lang(zh-CN) h2,:lang(zh-TW) h1,:lang(zh-TW) h2,:lang(ja) h1,:lang(ja) h2,:lang(ko) h1,:lang(ko) h2{letter-spacing:var(--tracking-cjk)}
h2{font-size:var(--size-h2);line-height:1.2;margin:0 0 24px}
h3{font-size:var(--size-h3);line-height:1.35;margin:0 0 16px}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
.shell,.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{max-width:760px;margin-bottom:40px}
.section-head p,.muted{color:var(--muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.two-up{grid-template-columns:repeat(2,minmax(0,1fr))}
.three-up{grid-template-columns:repeat(3,minmax(0,1fr))}
.four-up{grid-template-columns:repeat(4,minmax(0,1fr))}
.no-break{white-space:nowrap}
.mono,code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em;background:var(--panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;min-width:0;overflow-x:auto;padding:24px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel-2)}
pre code{padding:0;background:var(--clear);overflow-wrap:normal;white-space:pre}
.panel,.card{min-width:0;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--panel);box-shadow:var(--sh-card);padding:28px}
.panel-sunken{background:var(--panel-2);box-shadow:inset 0 1px 3px var(--ink-a06)}
.prose{max-width:860px;min-width:0}
.prose p,.prose li{overflow-wrap:break-word}
.prose ul{list-style:disc;padding-left:24px;margin-bottom:24px}
.prose ol{padding-left:28px}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose li+li{margin-top:8px}
.prose img{border-radius:var(--r-md)}
.decor-zone{position:relative;overflow-x:clip}
.decor-layer{position:absolute;inset:0;pointer-events:none;max-width:100%}
.tilt{transform:rotate(-2deg)}
.btn,.btn-primary,.btn-secondary,.btn-go,.btn-plan{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:12px 24px;border:1px solid var(--border);border-radius:var(--r-md);font-weight:var(--weight-strong);text-decoration:none;line-height:1.3;white-space:nowrap;flex-shrink:0;transition:background-color var(--ease),border-color var(--ease),transform var(--ease)}
.btn-primary,.btn-go{border-color:var(--clear);background:linear-gradient(180deg,var(--accent),var(--accent-dark));color:var(--white);box-shadow:var(--sh-btn)}
.btn-secondary,.btn-plan,.btn{background:var(--panel);color:var(--text)}
.btn-primary:hover,.btn-go:hover{transform:translateY(-1px)}
.btn-secondary:hover,.btn-plan:hover,.btn:hover{border-color:var(--accent);background:var(--accent-a08)}
.btn-primary:active,.btn-go:active{transform:translateY(1px)}
.btn:disabled,.btn-primary:disabled,.btn-secondary:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-go{height:56px;padding:0 24px 0 28px;font-size:17px}
.btn-plan{height:56px;padding:0 26px;font-size:17px;font-weight:var(--weight-medium);box-shadow:inset 0 1px 0 var(--white-a90)}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:28px;color:var(--accent-dark);font-weight:var(--weight-strong);text-decoration:none}
.text-link:hover{text-decoration:underline}
.skip{position:absolute;left:16px;top:12px;opacity:0;pointer-events:none;z-index:100;padding:10px 16px;border-radius:var(--r-xs);background:var(--accent-dark);color:var(--panel);text-decoration:none;font-weight:var(--weight-strong)}
.skip:focus{opacity:1;pointer-events:auto}
.topbar{position:relative;z-index:50;background:var(--panel-a82);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.topbar-in{display:flex;align-items:center;gap:28px;min-height:var(--header-height);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:none}
.brand img{display:block;width:36px;height:36px;border-radius:var(--r-logo);box-shadow:var(--sh-soft)}
.brand-word{font-family:var(--font-display);font-weight:var(--weight-display);font-size:21px;letter-spacing:var(--tracking-display);color:var(--text);white-space:nowrap}
.brand-go{color:var(--accent)}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav a{display:block;padding:8px 14px;border-radius:var(--r-pill);font-size:15px;font-weight:500;color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--ease),background-color var(--ease)}
.mainnav a:hover{color:var(--text);background:var(--panel2-a55)}
.mainnav a[aria-current="page"]{color:var(--accent-dark);font-weight:var(--weight-strong);background:var(--accent-a12)}
.topbar-act{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;width:auto;padding:8px 12px;border:0;border-radius:var(--r-pill);background:var(--clear);font-size:14px;color:var(--muted);cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel2-a55);color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:80;min-width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:var(--sh-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-xs);text-decoration:none}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-a12);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 22px;border:1.5px solid var(--accent);border-radius:var(--r-pill);background:var(--panel);color:var(--accent-dark);font-weight:var(--weight-strong);font-size:15px;text-decoration:none;white-space:nowrap;transition:background-color var(--ease)}
.login:hover{background:var(--accent-a08)}
.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);background:var(--panel-2);color:var(--accent-dark)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.nav-drawer{position:fixed;top:var(--header-height);inset-inline:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:40;padding:20px var(--gutter) 32px;background:var(--panel)}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm);text-decoration:none}
.nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--accent-a12);color:var(--accent-dark)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;top:var(--header-height);bottom:0;inset-inline:0;z-index:30;background:var(--veil)}
html.nav-open{overflow:hidden}
.site-footer{margin-top:64px;padding-top:56px;padding-bottom:28px;border-top:1px solid var(--border);background:var(--panel2-a55)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1.2fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-about p{margin-top:20px;max-width:360px;color:var(--muted)}
.footer-title{font-size:16px;font-weight:var(--weight-strong);margin-bottom:16px}
.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:30px;color:var(--muted);font-size:14px;text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:24px;color:var(--muted);font-size:13px}
.footer-bottom p{margin:0}
.footer-legal{display:flex;gap:20px}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;min-width:0;max-width:100%;overflow:hidden;margin-block:28px}
#server-status+*{margin-top:32px}
@media(min-width:1101px) and (max-width:1270px){.topbar-in{gap:18px}.mainnav a{padding-inline:10px}.lang{padding-inline:8px}.topbar-act{gap:6px}}
@media(max-width:1100px){.mainnav{display:none}.menu-toggle{display:flex}.topbar-in{gap:16px}.topbar-act{margin-left:auto}.footer-grid{gap:28px}}
@media(min-width:1101px){.nav-drawer,.nav-veil{display:none}}
@media(max-width:900px){.four-up{grid-template-columns:repeat(2,minmax(0,1fr))}.three-up{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-about{grid-column:1/-1}}
@media(max-width:768px){h1{font-size:clamp(28px,7vw,40px)}.two-up{grid-template-columns:1fr}.section{padding-top:56px;padding-bottom:56px}}
@media(max-width:640px){
  :root{--gutter:20px;--header-height:68px}
  .no-break{white-space:normal}
  .shell,.wrap{padding-inline:var(--gutter)}
  .tilt{transform:none}
  .decor-layer{max-width:100%}
  .four-up,.footer-grid{grid-template-columns:1fr}
  .footer-about{grid-column:auto}
  .topbar-in{gap:8px}
  .topbar-act{margin-left:auto;gap:4px}
  .brand{gap:7px}.brand img{width:30px;height:30px}.brand-word{font-size:18px}
  .lang{padding:8px 6px;font-size:12px;gap:4px}.lang svg{width:14px;height:14px}
  .login{padding-inline:14px;font-size:14px}
  .btn-go,.btn-plan{height:52px;font-size:16px}
  .panel,.card{padding:22px}
  .site-footer{padding-top:40px}.footer-grid{gap:28px}
}
@media(max-width:359px){:root{--gutter:16px}.brand-word{font-size:16px}.brand img{width:26px;height:26px}.login{padding-inline:10px}.lang{font-size:11px}.topbar-act{gap:2px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important}.reveal,.reveal.pending{opacity:1;transform:none}}