:root{
  color-scheme:light;
  --bg:#F4EDE0;
  --bg-lift:#F9F4EA;
  --bg-sink:#EDE3D1;
  --panel:#FFFBF3;
  --panel-2:#EBE2D1;
  --border:#DCD0BB;
  --accent:#3E6FD6;
  --accent-dark:#2B53A6;
  --accent-glow:#7A9BEA;
  --cream:#F6EBC8;
  --cream-hi:#FBF4DE;
  --cream-deep:#E6D6A9;
  --apricot:#E9B48C;
  --text:#2A2117;
  --text-hi:#46382A;
  --text-muted:#6E6252;
  --success:#2F8A5B;
  --warn:#C4851A;
  --error:#BE3F2E;
  --clear:transparent;
  --accent-a04:rgba(62,111,214,.04);
  --accent-a06:rgba(62,111,214,.06);
  --accent-a07:rgba(62,111,214,.07);
  --accent-a08:rgba(62,111,214,.08);
  --accent-a10:rgba(62,111,214,.10);
  --accent-a12:rgba(62,111,214,.12);
  --accent-a14:rgba(62,111,214,.14);
  --accent-a45:rgba(62,111,214,.45);
  --apricot-a06:rgba(233,180,140,.06);
  --apricot-a07:rgba(233,180,140,.07);
  --paper-a16:rgba(255,251,243,.16);
  --paper-a24:rgba(255,251,243,.24);
  --paper-a72:rgba(255,251,243,.72);
  --paper-a90:rgba(255,251,243,.90);
  --cream-a64:rgba(246,235,200,.64);
  --text-a08:rgba(42,33,23,.08);
  --text-a14:rgba(42,33,23,.14);
  --text-a22:rgba(42,33,23,.22);
  --text-a86:rgba(42,33,23,.86);
  --border-a70:rgba(220,208,187,.70);
  --success-a20:rgba(47,138,91,.20);
  --ink-mask:#000;
  --flag-red:#C9353E;
  --flag-white:#FFFDF7;
  --flag-navy:#2F3E78;
  --flag-black:#231D18;
  --flag-gold:#E3B23C;
  --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;
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --size-body:16px;
  --size-small:14px;
  --size-micro:12px;
  --size-h1:clamp(52px,4.5vw,64px);
  --size-h2:clamp(32px,3.4vw,48px);
  --size-h3:24px;
  --size-mobile-h1:36px;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --line-body:1.6;
  --line-display:1.1;
  --r-canvas:28px;
  --r-card:20px;
  --r-md:12px;
  --r-sm:10px;
  --r-xs:7px;
  --r-key:6px;
  --r-flag:3px;
  --r-hair:1px;
  --r-capsule-mobile:22px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:32px;
  --width-content:1280px;
  --width-reading:820px;
  --header-height:68px;
  --anchor-offset:84px;
  --toc-offset:16px;
  --toc-landing:96px;
  --space-section:80px;
  --ease-ui:.2s ease;
  --ease-reveal:.65s ease;
  --shadow-panel:inset 0 1px 0 var(--paper-a90),0 24px 56px -28px var(--accent-a10);
  --shadow-card:0 0 0 1px var(--cream-deep),0 0 0 6px var(--paper-a72),0 0 0 7px var(--border-a70),0 36px 64px -26px var(--accent-a12),0 14px 30px -16px var(--accent-a10);
  --shadow-float:0 12px 26px -10px var(--accent-a08),0 2px 6px var(--accent-a06);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:var(--line-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a{-webkit-tap-highlight-color:var(--clear)}
button{border:0}
a{color:var(--accent);text-underline-offset:4px}
a:hover{color:var(--accent-dark)}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-xs)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);font-weight:var(--weight-regular);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:var(--line-display);letter-spacing:var(--tracking-display);margin:0 0 24px}
h2{font-size:var(--size-h2);line-height:1.18;letter-spacing:var(--tracking-display);margin:0 0 24px}
h3{font-size:var(--size-h3);line-height:1.35;margin:0 0 16px}
:lang(zh-CN) h1,:lang(zh-CN) h2,:lang(zh-TW) h1,:lang(zh-TW) h2{letter-spacing:var(--tracking-cjk)}
p{margin:0 0 20px}
strong{font-weight:var(--weight-semibold)}
ul,ol{padding-left:24px}
li+li{margin-top:6px}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
p code,li code{background:var(--panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md);font-family:var(--font-mono)}
pre code{white-space:pre;overflow-wrap:normal}
.wrap{width:100%;max-width:var(--width-content);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--width-reading);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.flex-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.flex-row>*{min-width:0}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.kicker{font-family:var(--font-mono);font-size:var(--size-micro);letter-spacing:.08em;color:var(--text-muted);margin-bottom:12px}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.icon{display:block;width:24px;height:24px;flex-shrink:0}
.panel,.card{min-width:0;padding:28px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-panel)}
.panel-inset{padding:20px;background:var(--panel-2);border-radius:var(--r-md)}
.decor-region{position:relative;isolation:isolate;overflow-x:clip}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:10px 22px;border-radius:var(--r-pill);font-size:var(--size-body);font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap;flex-shrink:0;max-width:100%;border:1px solid var(--border);transition:background var(--ease-ui),color var(--ease-ui)}
.btn-primary{background:var(--cream);color:var(--text);border-color:var(--cream-deep);box-shadow:inset 0 1px 0 var(--paper-a90),0 10px 24px -16px var(--accent-a14)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--cream-hi);color:var(--text)}
.btn-secondary{background:var(--clear);border-color:var(--text);color:var(--text)}
.btn-secondary:hover,.btn-secondary.is-hover{background:var(--text-a08);color:var(--text)}
.btn-dark{background:var(--text);border-color:var(--text);color:var(--cream)}
.btn-dark:hover{background:var(--text-hi);color:var(--cream)}
.btn:active,.btn.is-pressed{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--text-muted);border-color:var(--border);cursor:not-allowed;box-shadow:none}
.btn.is-focus{outline:2px solid var(--accent-dark);outline-offset:3px}
.reveal{transition:opacity var(--ease-reveal),transform var(--ease-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:180px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
.topbar,#site-header{position:relative;z-index:100}
.topbar-inner{display:flex;align-items:center;height:var(--header-height);padding:0 56px;gap:0;position:relative}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand:hover{color:var(--text)}
.brand-mark{display:block;width:30px;height:30px;flex-shrink:0}
.brand-en{font-size:19px;font-weight:var(--weight-semibold);letter-spacing:-.02em}
.brand-zh{font-size:13px;font-weight:var(--weight-regular);color:var(--text-muted);padding-left:10px;box-shadow:inset 1px 0 0 var(--border)}
.mainnav{margin-left:48px}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:30px}
.mainnav li{margin:0}
.mainnav a{display:inline-block;padding:6px 0;font-size:15px;font-weight:var(--weight-regular);color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color var(--ease-ui)}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold)}
.topbar-tools{margin-left:auto;display:flex;align-items:center;gap:22px;flex-shrink:0}
.lang-box{position:relative}
.lang-switch{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;min-width:44px;width:auto;background:var(--clear);padding:6px 0;font-size:14px;color:var(--text-muted);white-space:nowrap}
.lang-switch span{white-space:nowrap}
.lang-caret{font-size:11px}
.lang-menu{position:absolute;right:0;top:100%;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float);z-index:4}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;color:var(--text);border-radius:var(--r-xs)}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--cream)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--r-pill);background:var(--text);color:var(--cream);font-size:14px;font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--paper-a16),0 8px 18px -10px var(--accent-a14);transition:background var(--ease-ui)}
.login-btn:hover{background:var(--text-hi);color:var(--cream)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;background:var(--clear);border:1px solid var(--border);border-radius:var(--r-sm)}
.menu-lines{width:18px;height:12px;display:block;border-top:1px solid currentColor;border-bottom:1px solid currentColor;position:relative}
.menu-lines::after{content:"";position:absolute;top:5px;left:0;right:0;border-top:1px solid currentColor}
.mobile-drawer{display:none}
.nav-veil{display:none}
.footer-shell{border-top:1px solid var(--border);background:var(--panel-2);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr .8fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-intro{margin-top:20px;color:var(--text-muted);max-width:320px}
.footer-title{font-size:var(--size-small);font-weight:var(--weight-semibold);margin-bottom:16px}
.footer-links{list-style:none;padding:0;margin:0}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;padding-block:4px;text-decoration:none;color:var(--text-muted);overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent-dark)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:var(--size-small);color:var(--text-muted)}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a{color:var(--text);min-height:24px}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:48px;font-size:32px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.85}
.prose img{display:block;border-radius:var(--r-md)}
@media(max-width:1280px){
  .topbar-inner{padding-inline:32px}
  .mainnav{margin-left:32px}
  .mainnav ul{gap:20px}
  .topbar-tools{gap:16px}
}
@media(max-width:1100px){
  .mainnav{margin-left:24px}
  .mainnav ul{gap:14px}
  .mainnav a{font-size:14px}
}
@media(max-width:960px){
  .topbar-inner{height:var(--header-height);padding-inline:24px}
  .mainnav{display:none}
  .topbar-tools{margin-left:auto;gap:14px}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:fixed;z-index:102;top:var(--header-height);left:0;right:0;padding:16px 24px 24px;background:var(--panel);border-bottom:1px solid var(--border);max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer li{margin:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;text-decoration:none;color:var(--text);border-radius:var(--r-xs)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--cream)}
  .drawer-language-title{padding:16px 12px 8px;color:var(--text-muted);font-size:var(--size-small);border-top:1px solid var(--border);margin-top:12px}
  .nav-veil:not([hidden]){display:block;position:fixed;inset:var(--header-height) 0 0;z-index:101;background:var(--text-a22)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:24px;--space-section:56px}
  h1{font-size:var(--size-mobile-h1)}
  h2{font-size:32px}
  .grid-three,.grid-two{grid-template-columns:minmax(0,1fr)}
  .card,.panel{padding:24px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.note-live,.ticket-wrap{transform:none}
  .decor-region>*{max-width:100%}
  .topbar-inner{padding-inline:16px}
  .topbar-tools{margin-left:auto;gap:8px}
  .brand-zh{display:none}
  .lang-switch{font-size:12px}
  .login-btn{padding-inline:14px}
  .mobile-drawer:not([hidden]){padding-inline:16px;max-width:100%}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-shell{padding-top:40px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}