:root{
  --bg:#E6EEFA;--bg-top:#F1F5FD;--bg-bottom:#DFE7F6;--panel:#F7FAFF;--panel-2:#D9E3F4;--border:#C9D5EA;
  --accent:#D9387E;--accent-dark:#A3225C;--amber:#F2994A;--violet:#7B4DE0;--ink:#15182B;--text:#141A2E;--muted:#55607A;--faint:#8791AB;
  --success:#1F9D63;--warn:#C97A12;--error:#D23A3A;--side:#1B2140;--side-text:#A6B0CF;--white:#FFFFFF;--clear:transparent;
  --hi:rgba(255,255,255,.95);--white-12:rgba(255,255,255,.12);--white-20:rgba(255,255,255,.2);--white-70:rgba(255,255,255,.7);
  --nav-glass:rgba(241,245,253,.82);--rose-06:rgba(217,56,126,.06);--rose-10:rgba(217,56,126,.10);--rose-12:rgba(217,56,126,.12);--rose-22:rgba(217,56,126,.22);
  --violet-10:rgba(123,77,224,.10);--violet-08:rgba(123,77,224,.08);--success-12:rgba(31,157,99,.12);
  --ink-06:rgba(21,24,43,.06);--ink-10:rgba(21,24,43,.10);--ink-35:rgba(21,24,43,.35);
  --wash-ice:#DCE7FB;--wash-violet:#E9E2FA;--grid-blue:rgba(70,104,210,.13);--grid-rose:rgba(217,56,126,.11);
  --flag-red:#D7263D;--flag-white:#FFFFFF;--flag-navy:#0B2A6B;--flag-blue:#263B7C;
  --grad-tri:linear-gradient(90deg,var(--amber) 0%,var(--accent) 50%,var(--violet) 100%);
  --grad-a:linear-gradient(90deg,var(--amber),var(--accent));--grad-b:linear-gradient(90deg,var(--accent),var(--violet));
  --grad-notice:linear-gradient(90deg,var(--amber) 0%,var(--accent) 36%,var(--violet) 100%);
  --grad-hero:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 48%,var(--bg-bottom) 100%);
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,monospace;
  --fs-tiny:11px;--fs-xs:12px;--fs-small:13px;--fs-ui:14px;--fs-nav:14.5px;--fs-body:16px;--fs-lead:18px;--fs-sub:17px;--fs-h3:24px;
  --fs-h2:clamp(28px,3vw,40px);--fs-h1:clamp(52px,4.6vw,66px);--fs-brand:20px;
  --r-xs:8px;--r-sm:10px;--r-md:14px;--r-lg:20px;--r-xl:28px;--r-2xl:36px;--r-stage:56px;--r-pill:999px;--r-round:50%;--r-flag:3px;--r-pixel:1px;
  --shadow-win:inset 0 1px 0 var(--hi),0 48px 90px -28px var(--rose-12),0 22px 40px -24px var(--ink-10);
  --shadow-back:inset 0 1px 0 var(--hi),0 36px 70px -26px var(--rose-12),0 16px 30px -20px var(--ink-10);
  --shadow-badge:inset 0 1px 0 var(--hi),0 18px 34px -14px var(--rose-12),0 8px 16px -10px var(--ink-10);
  --shadow-cap:0 18px 32px -12px var(--ink-35),0 0 0 3px var(--white-70);
  --shadow-button:inset 0 1px 0 var(--white-12),0 16px 30px -14px var(--ink-35),0 10px 26px -12px var(--rose-22);
  --gutter:24px;--content-width:1248px;--reading-width:800px;--nav-height:64px;--notice-height:40px;--header-height:104px;--anchor-offset:84px;--toc-offset:156px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-5:40px;--space-6:48px;--space-8:64px;--space-10:80px;
  --ease-out:cubic-bezier(.2,.7,.3,1);--duration-fast:.2s;--duration-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html,body{margin:0;padding:0}
body{font-family:var(--font-body);font-size:var(--fs-body);line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.04;background-image:linear-gradient(var(--accent) 1px,var(--clear) 1px),linear-gradient(90deg,var(--flag-blue) 1px,var(--clear) 1px);background-size:80px 80px}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
button:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed}
a,button,summary,input,select,textarea,[tabindex]{-webkit-tap-highlight-color:var(--rose-12)}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:4px}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
ul{padding-left:1.4em}
p,ul,ol,blockquote,pre{margin:0 0 var(--space-3)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--ink);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:900;line-height:1.12;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h2{font-size:var(--fs-h2);font-weight:800;line-height:1.22;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h3{font-size:var(--fs-h3);font-weight:750;line-height:1.35;margin:0 0 var(--space-2)}
h4{font-size:var(--fs-lead);margin:0 0 var(--space-2)}
code,kbd,pre{font-family:var(--font-mono)}
code{font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-flag);padding:.12em .35em}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);border:1px solid var(--border);border-radius:var(--r-md);background:var(--side);color:var(--panel);line-height:1.7}
pre code{background:none;color:inherit;padding:0;overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{word-break:keep-all}
hr{border:0;border-top:1px solid var(--border);margin:var(--space-5) 0}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--space-10);padding-bottom:var(--space-10)}
.sec-compact{padding-top:var(--space-6);padding-bottom:var(--space-6)}
:where(.grid,.card-grid,.footer-grid,.feature-browser)>*{min-width:0}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.lead{font-size:var(--fs-lead);color:var(--muted);line-height:1.7}
.kicker{font-family:var(--font-mono);font-size:var(--fs-small);font-weight:600;color:var(--accent-dark);margin-bottom:var(--space-2)}
.mono{font-family:var(--font-mono)}
.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}
.ico{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-xl);padding:var(--space-4);box-shadow:var(--shadow-back);min-width:0}
.panel-inset{background:var(--panel-2);border-radius:var(--r-lg);padding:var(--space-3)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.btn,.btn-primary,.btn-ghost,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:14px;min-height:52px;padding:12px 26px;border-radius:var(--r-pill);font-size:var(--fs-body);font-weight:700;line-height:1.3;white-space:nowrap;border:1px solid var(--clear)}
.btn-primary{position:relative;overflow:hidden;background:var(--ink);color:var(--white);box-shadow:var(--shadow-button)}
.btn-primary::before{content:"";position:absolute;inset:0;border-radius:inherit;box-shadow:inset 0 0 0 1.5px var(--rose-22),0 0 0 4px var(--rose-12);opacity:0;transition:opacity .25s ease}
.btn-primary::after{content:"";position:absolute;top:0;bottom:0;left:0;width:40%;background:linear-gradient(100deg,var(--clear),var(--white-20),var(--clear));transform:translateX(-160%);transition:transform .6s ease;pointer-events:none}
.btn-primary:hover::before{opacity:1}
.btn-primary:hover::after{transform:translateX(320%)}
.btn-arrow{width:32px;height:32px;border-radius:var(--r-round);display:inline-flex;align-items:center;justify-content:center;border:1.6px solid var(--white);flex:none}
.btn-arrow svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.btn-ghost{border:1.5px solid var(--clear);background:linear-gradient(var(--panel),var(--panel)) padding-box,var(--grad-tri) border-box;color:var(--ink);box-shadow:0 14px 28px -16px var(--rose-22);transition:opacity var(--duration-fast)}
.btn-ghost:hover{opacity:.86}
.btn-secondary{background:var(--panel);color:var(--ink);border-color:var(--border);box-shadow:var(--shadow-badge)}
.btn-secondary:hover{border-color:var(--accent)}
.btn-small{min-height:44px;padding:10px 18px;font-size:var(--fs-ui)}
.btn.is-hover{box-shadow:var(--shadow-button),0 0 0 4px var(--rose-12)}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:4px}
.text-link{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.cta-row{display:flex;justify-content:center;align-items:center;gap:16px;margin-bottom:22px}
.announce{position:relative;height:var(--notice-height);background:var(--grad-notice);color:var(--white);font-size:var(--fs-ui);font-weight:500;display:flex;align-items:center;justify-content:center;line-height:1.4;padding-inline:var(--gutter)}
.announce-text{letter-spacing:.01em;margin:0}
.announce-text a{font-weight:700;text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1.5px}
.announce-ctrl{position:absolute;right:24px;top:50%;transform:translateY(-50%);display:flex;align-items:center;gap:8px}
.ac-btn,.ac-close{width:26px;height:26px;border-radius:var(--r-pill);display:inline-flex;align-items:center;justify-content:center;color:var(--white)}
.ac-btn{background:var(--white-20)}
.ac-close{margin-left:10px}
.ac-btn svg,.ac-close svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
#site-header{position:relative;z-index:50}
.nav{position:relative;z-index:53;height:var(--nav-height);background:var(--nav-glass);backdrop-filter:saturate(1.2) blur(14px);-webkit-backdrop-filter:saturate(1.2) blur(14px)}
.nav-in{max-width:var(--content-width);height:100%;margin:0 auto;padding:0 var(--gutter);display:flex;align-items:center;gap:20px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{width:34px;height:34px;border-radius:var(--r-sm);box-shadow:inset 0 1px 0 var(--white-20),0 8px 18px -8px var(--rose-22);flex:none}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:var(--fs-brand);letter-spacing:-.02em;color:var(--ink);white-space:nowrap}
.desktop-nav{flex:1;min-width:0;display:flex;justify-content:center}
.menu{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:4px}
.menu li{min-width:0}
.menu a{display:inline-flex;align-items:center;gap:7px;min-height:38px;padding:0 13px;border-radius:var(--r-pill);font-size:var(--fs-nav);font-weight:500;color:var(--muted);border:1px solid var(--clear);white-space:nowrap;transition:background var(--duration-fast)}
.menu a:hover{color:var(--ink);background:var(--white-70)}
.menu a[aria-current="page"]{color:var(--ink);background:var(--panel);border-color:var(--border);font-weight:600}
.nav-end{display:flex;align-items:center;gap:10px;flex-shrink:0;margin-left:auto}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;min-width:44px;width:auto;padding:0 12px;font-size:var(--fs-ui);font-weight:500;color:var(--muted);border-radius:var(--r-pill);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--ink)}
.lang-caret{font-size:var(--fs-tiny);color:var(--muted)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:60;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-back);list-style:none;margin:0}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 14px;border-radius:var(--r-sm);font-size:var(--fs-ui)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:38px;padding:0 18px;border-radius:var(--r-pill);background:var(--ink);color:var(--white);font-size:var(--fs-ui);font-weight:600;white-space:nowrap;box-shadow:inset 0 1px 0 var(--white-12),0 8px 18px -10px var(--ink-35)}
.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);color:var(--ink)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pixel)}
.mobile-drawer{display:none;position:fixed;inset-inline:0;top:var(--header-height);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);z-index:52;padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-md)}
.mobile-drawer a[aria-current="page"],.mobile-drawer a:hover{background:var(--panel-2);color:var(--accent-dark)}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.drawer-label{font-size:var(--fs-small);font-weight:600;color:var(--muted);margin:0 16px 8px}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;background:var(--ink-35);z-index:51}
html.nav-open{overflow:hidden}
html.notice-off{--header-height:64px}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:var(--space-8);padding-bottom:var(--space-4)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--space-6)}
.footer-brand p{color:var(--muted);font-size:var(--fs-ui);max-width:34em;margin-top:20px}
.footer-title{font-size:var(--fs-ui);font-weight:800;margin:0 0 16px}
.footer-links{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px;font-size:var(--fs-ui)}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px}
.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:var(--space-5);font-size:var(--fs-ui)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;border-top:1px solid var(--border);padding-top:20px;margin-top:24px;font-size:var(--fs-small);color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:var(--space-8)}
.prose h3{margin-top:var(--space-5)}
.prose a:not(.btn):not(.btn-primary):not(.btn-secondary){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--r-lg)}
.reveal{transition:opacity var(--duration-reveal) var(--ease-out),transform var(--duration-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;width:100%;max-width:100%;min-height:160px;overflow:hidden;margin:var(--space-4) 0}
#server-status+*{margin-top:var(--space-4)}
#server-status>*{min-width:0;max-width:100%}
.decoration-zone{position:relative;overflow-x:clip;max-width:100%}
[data-count]{display:inline-block;min-width:3ch;font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:right}
@media(min-width:1101px) and (max-width:1279px){
  .nav-in{gap:12px}.menu a{padding-inline:9px;font-size:var(--fs-small)}.menu{gap:3px}.nav-end{gap:4px}.lang{padding-inline:8px}
}
@media(max-width:1100px){
  .desktop-nav{display:none}.nav-in{gap:12px}.nav-end{margin-left:auto}.menu-toggle{display:flex}
  html.nav-open .mobile-drawer{display:block}html.nav-open .nav-veil{display:block}
}
@media(max-width:768px){
  :root{--fs-h1:clamp(28px,5.2vw,40px);--fs-h2:clamp(26px,5vw,34px);--space-10:56px}
  .card-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
  .announce{font-size:var(--fs-xs);justify-content:flex-start;padding-right:44px}
  .announce-ctrl{right:10px}.ac-btn{display:none}.ac-close{margin:0}
}
@media(max-width:640px){
  :root{--gutter:16px;--fs-brand:18px;--space-8:48px}
  .no-break{white-space:normal}
  .tilt,.win-main,.win-mobile,.win-pack{transform:none}
  .decoration-zone,.stage,.stage-wash{max-width:100%}
  .panel,.card{padding:24px 20px}
  .nav-in{gap:8px}.brand{gap:7px}.brand-mark{width:28px;height:28px}.nav-end{gap:2px;margin-left:auto}
  .lang{padding-inline:6px;font-size:var(--fs-xs);gap:3px}.lang>.ico{display:none}.login{padding-inline:12px;min-height:36px;font-size:var(--fs-small)}.login .ico{display:none}
  .footer-grid{grid-template-columns:1fr;gap:32px}.footer-brand{grid-column:auto}.footer-links{gap:8px 16px}
  .cta-row{gap:12px;flex-wrap:wrap}.btn,.btn-primary,.btn-ghost,.btn-secondary{font-size:var(--fs-ui);padding-inline:22px}
  pre{padding:16px}
}
@media(max-width:359px){
  .brand-name{font-size:var(--fs-body)}.brand-mark{width:25px;height:25px}.nav-in{gap:4px}.lang{font-size:var(--fs-tiny);padding-inline:4px}.login{padding-inline:10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}