:root{
  color-scheme:light;
  --bg:#F6F6F9;
  --panel:#FFFFFF;
  --panel-2:#ECECF2;
  --line:#DEDDE7;
  --accent:#FF6B00;
  --accent-dark:#D44E00;
  --ink:#121320;
  --muted:#5B5D70;
  --ok:#2F8A3A;
  --warn:#B97F00;
  --err:#D6303F;
  --violet:#6A3CF5;
  --pink:#E66BEF;
  --lime:#D8F23A;
  --grass:#3B8C2A;
  --pixel:#6E8BFA;
  --peach:#FFC6A0;
  --apricot:#FFA366;
  --white:#FFFFFF;
  --deep:#16172A;
  --deep-2:#1E2036;
  --deep-line:#2E3150;
  --flag-red:#D52B1E;
  --flag-blue:#1F3A93;
  --flag-navy:#0B2368;
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --text-xs:11px;
  --text-sm:13px;
  --text-label:14px;
  --text-nav:15px;
  --text-body:16px;
  --text-lede:18px;
  --text-brand:20px;
  --text-h3:24px;
  --text-h2:34px;
  --text-h1:clamp(52px,4.72vw,68px);
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --r-xs:4px;
  --r-s:6px;
  --r:8px;
  --r-pill:999px;
  --wrap:1312px;
  --reading:820px;
  --gutter:24px;
  --header-height:104px;
  --toc-offset:16px;
  --anchor-offset:96px;
  --ease:ease;
  --fast:.2s;
  --reveal-time:.35s;
  --grid-line:color-mix(in srgb,var(--violet) 16%,transparent);
  --sh-violet:0 18px 44px -14px color-mix(in srgb,var(--violet) 14%,transparent),0 2px 6px color-mix(in srgb,var(--violet) 6%,transparent);
  --sh-panel:inset 0 1px 0 var(--white),0 20px 48px -20px color-mix(in srgb,var(--pixel) 12%,transparent);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:var(--text-body);line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
a{color:inherit;text-underline-offset:4px}
a,button,summary{ -webkit-tap-highlight-color:var(--clear)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--ink);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed}
h1,h2,h3,h4{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--text-h1);font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--text-h2);font-weight:var(--weight-display);line-height:1.2;letter-spacing:-.02em}
h3{font-size:var(--text-h3);line-height:1.3}
p{margin:0 0 1em}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.section-head{margin-bottom:28px}
.section-head h2{margin:0 0 12px}
.section-head p{color:var(--muted);max-width:680px}
:where(.grid,.plan-grid,.platform-grid,.article-grid,.pixel-strip)>*{min-width:0}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--deep);color:var(--white);border-radius:var(--r);-webkit-overflow-scrolling:touch}
pre code{background:var(--clear);padding:0;color:inherit;white-space:pre;overflow-wrap:normal}
.prose{min-width:0;overflow-wrap:break-word;line-height:1.85}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a,.text-link{text-decoration-color:var(--accent);text-decoration-thickness:2px}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:24px;box-shadow:var(--sh-panel)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 24px;border:1px solid var(--clear);border-radius:var(--r);font-family:var(--font-body);font-size:var(--text-body);font-weight:var(--weight-bold);line-height:1.3;text-decoration:none;flex-shrink:0;white-space:nowrap;transition:background-color var(--fast) var(--ease),color var(--fast) var(--ease),transform var(--fast) var(--ease),box-shadow var(--fast) var(--ease)}
.btn svg{width:16px;height:16px;display:block;flex-shrink:0}
.btn-primary{background:var(--accent);color:var(--ink);box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 45%,transparent),0 12px 26px -10px color-mix(in srgb,var(--accent) 55%,transparent)}
.btn-primary:hover{background:var(--accent-dark);color:var(--white);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{background:var(--clear);color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--ink);color:var(--white)}
.btn-small{min-height:36px;padding:8px 14px;font-size:var(--text-label)}
.cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px}
.rulebar{background:linear-gradient(90deg,var(--violet) 0%,var(--violet) 50%,color-mix(in srgb,var(--violet) 55%,var(--pink)) 76%,var(--accent) 100%);color:var(--white);box-shadow:inset 0 -1px 0 color-mix(in srgb,var(--white) 18%,transparent)}
.rulebar-inner{max-width:var(--wrap);margin:0 auto;height:40px;padding:0 var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:16px}
.rulebar-arrow{width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;border:0;border-radius:var(--r-s);background:var(--clear);color:var(--white);text-decoration:none}
.rulebar-arrow:hover{background:color-mix(in srgb,var(--white) 16%,transparent)}
.rulebar-arrow svg{width:16px;height:16px;display:block}
.rulebar-text{margin:0;display:flex;align-items:center;gap:10px;font-size:var(--text-label);font-weight:var(--weight-medium);letter-spacing:.01em}
.rulebar-chip{font-family:var(--font-mono);font-size:var(--text-xs);font-weight:var(--weight-semibold);padding:2px 7px;border-radius:var(--r-xs);background:color-mix(in srgb,var(--white) 18%,transparent);box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 30%,transparent)}
#site-header{position:relative;z-index:50}
.masthead{position:relative;z-index:30;background:var(--panel);border-bottom:1px solid var(--line)}
.mast-inner{max-width:var(--wrap);margin:0 auto;height:64px;padding:0 var(--gutter);display:flex;align-items:center;flex-wrap:nowrap;gap:36px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);flex-shrink:0}
.brand-mark{width:28px;height:28px;display:block}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--text-brand);line-height:1;letter-spacing:-.02em}
.brand-zh{font-size:var(--text-label);font-weight:var(--weight-medium);color:var(--muted)}
.nav{flex:1;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-link{position:relative;display:inline-flex;align-items:center;gap:4px;min-height:36px;padding:8px 12px;border:0;border-radius:var(--r-s);background:var(--clear);font-family:var(--font-body);font-size:var(--text-nav);font-weight:var(--weight-medium);line-height:1.25;color:var(--ink);text-decoration:none;white-space:nowrap;cursor:pointer}
.nav-link:hover{background:var(--panel-2)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;background:var(--accent)}
.nav-link svg{width:14px;height:14px;display:block;color:var(--muted)}
.nav-more{position:relative}
.nav-more>summary{list-style:none}
.nav-more>summary::-webkit-details-marker{display:none}
.nav-menu{position:absolute;top:calc(100% + 8px);left:0;z-index:70;min-width:210px;margin:0;padding:6px;list-style:none;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh-violet);display:none}
.nav-more.is-open>.nav-menu,.nav-more[open]>.nav-menu{display:block}
.nav-menu a{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:40px;padding:9px 10px;border-radius:var(--r-s);font-size:var(--text-label);color:var(--ink);text-decoration:none}
.nav-menu a:hover,.nav-menu a[aria-current="page"]{background:var(--panel-2)}
.mast-tools{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;width:auto;min-width:44px;min-height:36px;padding:6px 10px;border:0;border-radius:var(--r-s);background:var(--clear);font-family:var(--font-body);font-size:var(--text-label);font-weight:var(--weight-medium);color:var(--muted);text-decoration:none;white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--ink)}
.lang svg{width:16px;height:16px;display:block;flex-shrink:0}
.lang span{white-space:nowrap}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 8px);z-index:80;width:184px;padding:6px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh-violet)}
.lang-picker.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;text-decoration:none;border-radius:var(--r-s);font-size:var(--text-label)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:8px 16px;border:1px solid var(--ink);border-radius:var(--r);background:var(--panel);font-size:var(--text-label);font-weight:var(--weight-semibold);color:var(--ink);text-decoration:none;white-space:nowrap;flex-shrink:0}
.btn-login svg{width:15px;height:15px;display:block;flex-shrink:0}
.btn-login:hover{background:var(--ink);color:var(--white)}
.burger{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--line);border-radius:var(--r-s);background:var(--panel);color:var(--ink)}
.burger-line{display:block;width:20px;height:2px;background:currentColor;transition:transform var(--fast) var(--ease)}
.burger[aria-expanded="true"] .burger-line:first-child{transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] .burger-line:nth-child(2){opacity:0}
.burger[aria-expanded="true"] .burger-line:last-child{transform:translateY(-7px) rotate(-45deg)}
.mobile-drawer{display:none}
.nav-veil{display:none}
.mobile-languages{border-top:1px solid var(--line);padding-top:12px;margin-top:12px}
.footer{background:var(--panel);border-top:1px solid var(--line);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.4fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-intro{max-width:330px;margin:18px 0;color:var(--muted);font-size:var(--text-label);line-height:1.8}
.footer-title{margin:0 0 16px;font-family:var(--font-mono);font-size:var(--text-sm);font-weight:var(--weight-semibold)}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0;padding:0;list-style:none}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-label);text-decoration-color:var(--line)}
.footer-links a:hover{text-decoration-color:var(--accent)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-sm);color:var(--muted)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:20px;font-family:var(--font-mono);font-size:var(--text-xs);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{min-height:24px;display:inline-flex;align-items:center}
.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-block:24px}
#server-status+*{margin-top:24px}
.decoration-zone{position:relative;overflow-x:clip}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
@media(max-width:1100px){
  .mast-inner{gap:20px}
  .nav-link{padding-inline:9px;font-size:var(--text-label)}
  .mast-tools{gap:6px}
}
@media(max-width:900px){
  :root{--header-height:104px}
  .nav{display:none}
  .mast-tools{margin-left:auto}
  .burger{display:flex}
  .mobile-drawer{position:fixed;top:var(--header-height);left:0;right:0;z-index:25;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px var(--gutter) 32px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain}
  .mobile-drawer.is-open{display:block}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 14px;border-radius:var(--r-s);text-decoration:none}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2)}
  .nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:21;border:0;background:color-mix(in srgb,var(--ink) 30%,transparent)}
  .nav-veil.is-open{display:block}
  .footer-grid{gap:28px;grid-template-columns:1fr 1fr}
  .footer-grid>:first-child{grid-column:1/-1}
}
@media(max-width:768px){
  :root{--text-h1:clamp(28px,6vw,40px);--text-h2:28px}
  .section{padding-top:40px;padding-bottom:40px}
  .mast-inner{gap:12px}
}
@media(max-width:640px){
  :root{--gutter:16px;--header-height:112px}
  .no-break{white-space:normal}
  .tilt,.tilted{transform:none}
  .decoration-zone>*{max-width:100%}
  .rulebar-inner{min-height:48px;height:auto;gap:6px;padding-block:6px}
  .rulebar-text{font-size:var(--text-xs);gap:6px;text-align:center}
  .rulebar-chip{display:none}
  .rulebar-arrow{width:24px;height:28px}
  .mast-inner{height:64px;gap:8px}
  .brand{gap:6px}
  .brand-en{font-size:var(--text-lede)}
  .brand-mark{width:24px;height:24px}
  .mast-tools{gap:4px;margin-left:auto}
  .lang{padding-inline:4px;font-size:var(--text-xs);gap:3px}
  .lang svg{width:13px;height:13px}
  .btn-login{padding-inline:10px;font-size:var(--text-sm)}
  .btn-login svg{display:none}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-grid>:first-child{grid-column:auto}
  .panel,.card{padding:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}