:root {
  color-scheme: light;
  --bg:#F8F1E4;
  --bg-panel:#FFFBF3;
  --bg-panel-2:#EFE5D2;
  --border:#E2D5BD;
  --accent:#1E50F0;
  --accent-dark:#1638B4;
  --text:#2A1F16;
  --text-muted:#6E5E4D;
  --success:#2F8A4E;
  --warn:#C97A12;
  --error:#C2362B;
  --peach:#F6C7A8;
  --lilac:#E8CDEE;
  --sky:#C5DBF6;
  --lilac-deep:#A672C2;
  --persimmon:#D5612A;
  --char:#1E1812;
  --char-2:#251E17;
  --char-3:#2F271F;
  --char-4:#3B3128;
  --char-text:#F4EADA;
  --char-muted:#A9987F;
  --flag-red:#C8312B;
  --flag-white:#FFFDF7;
  --flag-navy:#22306A;
  --clear:transparent;
  --char-line:color-mix(in srgb,var(--char-text) 9%,transparent);
  --char-hi:color-mix(in srgb,var(--char-text) 14%,transparent);
  --accent-tint:color-mix(in srgb,var(--accent) 10%,var(--bg-panel));
  --sh-cobalt-10:color-mix(in srgb,var(--accent) 10%,transparent);
  --sh-cobalt-12:color-mix(in srgb,var(--accent) 12%,transparent);
  --sh-brown:color-mix(in srgb,var(--text) 9%,transparent);
  --sh-char:color-mix(in srgb,var(--char) 38%,transparent);
  --hi:color-mix(in srgb,var(--bg-panel) 78%,transparent);
  --hairline:color-mix(in srgb,var(--text) 9%,transparent);
  --veil:color-mix(in srgb,var(--char) 35%,transparent);
  --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,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-body:400;
  --weight-medium:500;
  --weight-bold:700;
  --weight-display:900;
  --text-xs:12px;
  --text-sm:13.5px;
  --text-base:15px;
  --text-lg:20px;
  --text-h1:clamp(52px,5.3vw,68px);
  --text-h2:clamp(28px,3.3vw,42px);
  --text-h3:24px;
  --tracking-display:-.03em;
  --r-btn:6px;
  --r-card:12px;
  --r-halo:28px;
  --r-pill:999px;
  --r-small:4px;
  --r-row:8px;
  --wrap:1200px;
  --gutter:24px;
  --section-space:80px;
  --feature-space:120px;
  --notice-height:32px;
  --head-height:56px;
  --header-edge:88px;
  --anchor-space:104px;
  --toc-offset:16px;
  --toc-landing:96px;
  --grain:.03;
  --shadow-panel:0 26px 50px -18px var(--sh-cobalt-12),0 2px 6px var(--sh-brown);
  --shadow-halo:inset 0 0 0 1px var(--hi),inset 0 2px 0 var(--hi),0 40px 80px -30px var(--sh-cobalt-10),0 10px 30px -16px var(--sh-brown);
  --time-fast:.18s;
  --time-reveal:.35s;
  --grain-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .165 0 0 0 0 .122 0 0 0 0 .086 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-space)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-body);line-height:1.6;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:90;pointer-events:none;opacity:var(--grain);mix-blend-mode:multiply;background-image:var(--grain-image)}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button,summary{cursor:pointer}
button{border:0}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
p,ul,ol,blockquote{margin-top:0}
p{margin-bottom:1em}
ul,ol{padding-left:1.5em}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-display);line-height:1.2;letter-spacing:var(--tracking-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--text-h1);margin:0 0 20px}
h2{font-size:var(--text-h2);margin:0 0 24px}
h3{font-size:var(--text-h3);margin:0 0 16px}
h4{font-size:var(--text-lg)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed}
[hidden]{display:none!important}
.wrap{width:100%;max-width:calc(var(--wrap) + 2 * var(--gutter));margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.reading{max-width:860px;margin-inline:auto}
:where(.grid,.card-grid,.feature-row,.footer-grid)>*{min-width:0}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.text-link{color:var(--accent);text-decoration:underline;text-underline-offset:4px;display:inline-block;min-height:24px}
.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}
.icon{width:20px;height:20px}
.ln{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
code{font-family:var(--font-mono);overflow-wrap:anywhere;background:var(--bg-panel-2);border-radius:var(--r-small);padding:.12em .3em}
pre{max-width:100%;overflow-x:auto;padding:24px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--char);color:var(--char-text)}
pre code{background:var(--clear);padding:0;white-space:pre;overflow-wrap:normal}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:var(--shadow-panel),inset 0 1px 0 var(--hi)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:220px;max-width:100%;min-height:46px;padding:10px 20px;border-radius:var(--r-btn);font-size:16px;font-weight:var(--weight-bold);letter-spacing:.01em;line-height:1.5;flex-shrink:0;white-space:nowrap;transition:transform var(--time-fast) ease,background var(--time-fast) ease}
.btn-main,.btn-primary{color:var(--bg-panel);background:linear-gradient(180deg,var(--accent) 0%,var(--accent) 45%,var(--accent-dark) 100%);box-shadow:inset 0 1px 0 color-mix(in srgb,var(--bg-panel) 32%,transparent),0 14px 26px -12px color-mix(in srgb,var(--accent) 58%,transparent)}
.btn-main:hover,.btn-primary:hover{transform:translateY(-1px)}
.btn-main:active,.btn-primary:active{transform:translateY(1px)}
.btn-line,.btn-secondary{color:var(--text);border:1px solid var(--text);background:color-mix(in srgb,var(--bg-panel) 55%,transparent)}
.btn-line:hover,.btn-secondary:hover{background:var(--bg-panel)}
.btn-small{width:auto;min-height:40px;font-size:14px}
.notice{min-height:var(--notice-height);background:var(--bg-panel-2);border-bottom:1px solid var(--border);font-size:13px}
.notice .wrap{display:flex;align-items:center;justify-content:center;gap:10px;min-height:var(--notice-height)}
.notice-dot{width:11px;height:11px;border-radius:var(--r-pill);flex-shrink:0;background:var(--lilac);box-shadow:inset 0 0 0 3px var(--lilac),inset 0 0 0 6px var(--lilac-deep)}
.notice-sep{color:var(--text-muted)}
.notice-link{display:inline-flex;align-items:center;gap:4px;min-height:24px;margin-left:6px;color:var(--accent);font-weight:600;text-decoration:underline;text-underline-offset:3px;white-space:nowrap}
.notice-link svg{width:14px;height:14px}
#site-header{position:sticky;top:0;z-index:80}
.head{height:var(--head-height);border-bottom:1px solid var(--hairline);position:relative;z-index:52}
.head .wrap{display:flex;align-items:center;flex-wrap:nowrap;gap:34px;height:100%}
.brand{display:inline-flex;align-items:center;gap:9px;flex-shrink:0}
.brand img{width:30px;height:30px;display:block}
.brand-word{font-family:var(--font-display);font-weight:var(--weight-display);font-size:21px;letter-spacing:var(--tracking-display)}
.brand-zh{font-weight:var(--weight-medium);color:var(--text-muted)}
.nav{display:flex;align-items:center;flex:1;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav a,.nav summary{position:relative;display:inline-flex;align-items:center;gap:6px;min-height:34px;padding:0 12px;border-radius:var(--r-btn);font-size:14.5px;font-weight:var(--weight-medium);white-space:nowrap}
.nav a:hover,.nav summary:hover{background:color-mix(in srgb,var(--bg-panel) 60%,transparent)}
.nav a[aria-current="page"]{font-weight:var(--weight-bold)}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;border-radius:var(--r-small);background:var(--text)}
details summary{list-style:none}
details summary::-webkit-details-marker{display:none}
.caret{font-size:10px;color:var(--text-muted)}
.drop{position:relative}
.drop:not([open])>.menu{display:none}
.drop[open]>.menu{display:block}
.menu{position:absolute;left:0;top:calc(100% + 8px);min-width:224px;padding:8px;z-index:60;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-panel)}
.menu-group+.menu-group{margin-top:6px;padding-top:6px;border-top:1px solid var(--border)}
.menu-label{display:block;padding:6px 10px 2px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--text-muted)}
.menu a{display:flex;align-items:center;width:100%;min-height:34px;padding:6px 10px;border-radius:var(--r-btn)}
.menu a:hover{background:var(--bg-panel-2)}
.tools{margin-left:auto;display:flex;align-items:center;gap:12px;flex-shrink:0}
.lang{position:relative}
.lang-button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:34px;padding:5px 10px;border-radius:var(--r-btn);font-size:14px;color:var(--text-muted);background:var(--clear)}
.lang-button span{white-space:nowrap}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);width:160px;padding:8px;z-index:65;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;width:100%;min-height:40px;padding:6px 10px;border-radius:var(--r-btn)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:36px;padding:6px 18px;border-radius:var(--r-btn);background:var(--text);color:var(--bg-panel);font-size:14.5px;font-weight:var(--weight-bold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--char-hi),0 6px 14px -8px var(--sh-char)}
.btn-login svg{width:15px;height:15px}
.btn-login:hover{background:var(--char-4)}
.nav-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border-radius:var(--r-btn);background:var(--clear);color:var(--text)}
.burger-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-small)}
.nav-drawer{position:fixed;top:var(--header-edge);right:0;left:0;height:calc(100dvh - var(--header-edge));max-height:calc(100dvh - var(--header-edge));padding:8px var(--gutter);background:var(--bg-panel);overflow-y:auto;overscroll-behavior:contain;z-index:100}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 16px;border-bottom:1px solid var(--border);font-size:16px;line-height:1.4}
.nav-drawer a[aria-current="page"]{color:var(--accent);font-weight:var(--weight-bold)}
.nav-veil{position:fixed;inset:var(--header-edge) 0 0;z-index:49;background:var(--veil)}
html.nav-open{overflow:hidden}
html.nav-open #site-header{z-index:200}
html.nav-open .blog-skip-link,html.nav-open .float-cta{visibility:hidden}
.site-footer{padding-top:64px;padding-bottom:28px;background:var(--bg-panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:330px;margin-top:18px;color:var(--text-muted)}
.footer-title{font-size:16px;font-weight:var(--weight-bold);margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-sm)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:3px}
.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:16px;margin-top:20px;font-size:var(--text-sm);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.reveal{transition:opacity var(--time-reveal) ease,transform var(--time-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-height:80px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
#server-status :where(.grid,[class*="grid"]){min-width:0;max-width:100%}
#server-status :where(.grid,[class*="grid"])>*{min-width:0}
.decorated,.stripe-halo{position:relative;overflow-x:clip;max-width:100%}
@media(min-width:901px){.nav-drawer,.nav-veil{display:none!important}}
@media(max-width:1100px){.head .wrap{gap:20px}.nav a,.nav summary{padding-inline:9px}.tools{gap:6px}}
@media(max-width:900px){.nav{display:none}.nav-toggle{display:inline-flex}.tools{margin-left:auto}.head .wrap{gap:12px}.footer-grid{gap:28px;grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:768px){h1{font-size:clamp(28px,6vw,40px)}.card-grid{grid-template-columns:1fr}.section{padding-top:56px;padding-bottom:56px}}
@media(max-width:640px){
  :root{--gutter:16px;--section-space:56px;--feature-space:64px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decorated,.stripe-halo{max-width:100%;overflow-x:clip}
  .head .wrap{gap:8px}
  .brand{gap:6px}.brand-word{font-size:18px}.brand img{width:26px;height:26px}
  .tools{margin-left:auto;gap:2px}
  .btn-login{padding-inline:10px;font-size:13px}
  .btn-login svg{display:none}
  .lang-button{padding-inline:5px;font-size:12px}
  .notice{font-size:11px}
  .notice .wrap{gap:5px}
  .notice-link{margin-left:0}
  .notice-dot{width:8px;height:8px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{grid-column:auto}
  .panel,.card{padding:20px}
}
@media(max-width:359px){.brand-word{font-size:16px}.brand img{width:24px;height:24px}.lang-button{font-size:11px}.notice .notice-sep{display:none}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}