:root{
  --bg:#FCF5E8;--bg-top:#FFF9EF;--bg-bottom:#F4EAD8;--panel:#FFFDF8;--panel-2:#F3E9D7;
  --panel-70:rgba(255,253,248,.72);--panel-glass:rgba(255,253,248,.88);
  --border:#E6D9C2;--border-strong:#CDBB9C;
  --accent:#2541D4;--accent-dark:#1A2E9E;--accent-soft:#E9EDFC;
  --accent-06:rgba(37,65,212,.06);--accent-10:rgba(37,65,212,.10);--accent-14:rgba(37,65,212,.14);--accent-18:rgba(37,65,212,.18);--accent-30:rgba(37,65,212,.30);--accent-40:rgba(37,65,212,.40);
  --text:#2A2017;--text-2:#4A3D30;--muted:#6E6152;--placeholder:#A99A84;--on-accent:#FFFFFF;
  --success:#2F8A5B;--warn:#C27A12;--error:#C2402E;
  --apricot:#F2A25C;--mint:#9AD6C2;--peri:#B9C4F2;
  --apricot-14:rgba(242,162,92,.14);--apricot-22:rgba(242,162,92,.22);
  --blob-apricot:rgba(242,162,92,.42);--blob-mint:rgba(154,214,194,.52);--blob-peri:rgba(185,196,242,.56);--blob-clear:rgba(252,245,232,0);
  --halo-a:rgba(242,162,92,.62);--halo-b:rgba(247,205,165,.55);--halo-c:rgba(154,214,194,.74);--halo-edge:rgba(255,255,255,.7);
  --mint-bg:#E4F4EC;--mint-line:#BFE4D6;--mint-ink:#24704F;--mint-ring:rgba(154,214,194,.7);
  --white:#FFFFFF;--white-30:rgba(255,255,255,.3);
  --ink:#17151F;--ink-2:#1F1D28;--ink-3:#2A2734;--ink-side:#1B1923;--ink-line:rgba(255,255,255,.08);--ink-hi:rgba(255,255,255,.12);--ink-text:#F3EEE6;--ink-muted:#A39B8F;--veil:rgba(23,21,31,.4);
  --flag-white:#FFFFFF;--flag-us-red:#B22234;--flag-us-blue:#3C3B6E;--flag-sg-red:#E8112D;--flag-jp-red:#BC002D;--flag-hk-red:#DE2910;--flag-ch-red:#D52B1E;--flag-nl-red:#AE1C28;--flag-nl-blue:#21468B;--flag-edge:rgba(42,32,23,.14);
  --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;
  --r-btn:6px;--r-card:10px;--r-halo:24px;--r-halo-mobile:16px;--r-window:14px;--r-row:8px;--r-small:4px;--r-flag:3px;--r-pill:999px;--r-circle:50%;
  --shadow-card:0 22px 48px -16px var(--accent-14),0 2px 8px var(--accent-06);
  --shadow-window:0 48px 96px -32px var(--accent-10),0 16px 40px -16px var(--accent-10);
  --gutter:40px;--content-width:1280px;--section-space:88px;--head-height:68px;--drawer-top:107px;--toc-offset:16px;--anchor-offset:100px;
  --size-body:17px;--size-small:14px;--size-h1:clamp(52px,5vw,68px);--size-h2:clamp(30px,3.2vw,44px);--size-h3:28px;
  --weight-display:900;--weight-body:400;--weight-bold:700;--tracking-display:-.03em;--tracking-cjk:-.02em;
  --ease-out:cubic-bezier(.2,.7,.3,1);--duration-fast:.2s;--duration-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img,video{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
a{color:var(--accent);text-underline-offset:4px}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-btn)}
button:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{margin:0 0 28px;font-size:var(--size-h1);font-weight:var(--weight-display);line-height:1.12;letter-spacing:var(--tracking-display)}
:lang(zh-CN) h1,:lang(zh-TW) h1,:lang(ja) h1,:lang(ko) h1{letter-spacing:var(--tracking-cjk)}
h2{margin:0 0 24px;font-size:var(--size-h2);line-height:1.2;font-weight:var(--weight-display);letter-spacing:var(--tracking-cjk)}
h3{margin:0 0 16px;font-size:var(--size-h3);line-height:1.3;font-weight:var(--weight-display);letter-spacing:var(--tracking-cjk)}
p{margin:0 0 20px}
ul,ol{padding-left:1.5em}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);font-size:14px}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin-inline:0}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.reading-wrap{max-width:880px;margin-inline:auto;padding-inline:var(--gutter)}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li+li{margin-top:8px}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*,:where(.wrap,.reading-wrap,.prose) :where(article,section,div){min-width:0}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shadow-card)}
.panel--quiet{background:var(--panel-2);box-shadow:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;flex-shrink:0;height:50px;padding:0 26px;border:0;border-radius:var(--r-btn);font-family:var(--font-body);font-size:17px;font-weight:700;line-height:1;text-decoration:none;white-space:nowrap;transition:background-color var(--duration-fast),box-shadow var(--duration-fast),color var(--duration-fast)}
.btn svg{width:18px;height:18px}
.btn--primary,.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--white-30),0 12px 26px -10px var(--accent-40)}
.btn--primary:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn--outline,.btn-secondary{border:1.5px solid var(--text);background:var(--panel-70);color:var(--text)}
.btn--outline:hover,.btn-secondary:hover{background:var(--panel)}
.btn--small{height:40px;padding-inline:18px;font-size:14px}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:28px;font-weight:700}
.notice{background:var(--panel-2);border-bottom:1px solid var(--border);font-size:14px;line-height:20px;color:var(--muted)}
.notice__row{display:flex;align-items:center;justify-content:center;gap:12px;padding-top:9px;padding-bottom:9px}
.notice__dot{flex:none;width:10px;height:10px;border-radius:var(--r-circle);background:var(--accent);box-shadow:0 0 0 4px var(--accent-18)}
.notice__link{color:var(--text);font-weight:600;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:1.5px;text-underline-offset:4px}
.notice__more{display:inline-flex;align-items:center;gap:6px;min-width:24px;min-height:24px;color:var(--accent);font-weight:600;text-decoration:none}
.notice__more svg{width:16px;height:16px}
#site-header{position:relative;z-index:50}
.site-head{position:relative;z-index:53;background:var(--panel-glass);border-bottom:1px solid var(--border);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.site-head__row{display:flex;align-items:center;gap:32px;height:var(--head-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:30px;color:var(--text);text-decoration:none;font-family:var(--font-display);font-weight:900;font-size:22px;letter-spacing:-.02em;line-height:1}
.brand__mark{width:30px;height:30px;flex:none}
.nav{flex:1;min-width:0}
.nav__list{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0}
.nav__list li{display:flex;align-items:center}
.nav__list li+li::before{content:"·";padding:0 14px;color:var(--border-strong);font-weight:800}
.nav__list a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);text-decoration:none;font-size:15px;font-weight:600;line-height:24px;white-space:nowrap}
.nav__list a:hover{color:var(--text)}
.nav__list a[aria-current="page"]{color:var(--text);font-weight:800;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:8px}
.head-tools{display:flex;align-items:center;gap:16px;flex-shrink:0;margin-left:auto}
.language{position:relative}
.lang{appearance:none;display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;width:auto;min-width:44px;padding:6px 4px;border:0;background:none;color:var(--muted);font:inherit;font-size:14px;line-height:20px;cursor:pointer;white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang__caret{font-size:11px}
.lang-panel{position:absolute;z-index:56;right:0;top:calc(100% + 12px);width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;color:var(--text);text-decoration:none;border-radius:var(--r-btn)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-soft)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;flex:none;height:38px;padding:0 18px;border:1.5px solid var(--text);border-radius:var(--r-btn);background:var(--panel);color:var(--text);text-decoration:none;font-size:15px;font-weight:700;line-height:1;white-space:nowrap;transition:background-color var(--duration-fast),color var(--duration-fast)}
.btn-login:hover{background:var(--text);color:var(--panel)}
.menu-toggle{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(--border);border-radius:var(--r-btn);background:var(--panel);color:var(--text)}
.menu-toggle__line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"]{background:var(--panel-2)}
.mobile-drawer{position:fixed;z-index:52;top:var(--drawer-top);right:0;left:0;height:calc(100dvh - var(--drawer-top));max-height:calc(100dvh - var(--drawer-top));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--panel);border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:10px 12px;border-bottom:1px solid var(--border);color:var(--text);text-decoration:none;font-weight:600}
.mobile-drawer a[aria-current]{color:var(--accent);background:var(--accent-soft)}
.mobile-drawer__label{margin:24px 12px 8px;color:var(--muted);font-size:14px}
.nav-veil{position:fixed;z-index:51;inset:var(--drawer-top) 0 0;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-foot{border-top:1px solid var(--border);background:var(--panel-2);padding-top:56px;padding-bottom:28px}
.foot-grid{display:grid;grid-template-columns:minmax(0,1.4fr) repeat(3,minmax(0,1fr));gap:40px}
.foot-brand p{max-width:320px;margin-top:20px;color:var(--muted);font-size:15px}
.foot-heading{margin:0 0 14px;font-size:16px;line-height:1.5;font-weight:800}
.foot-links{list-style:none;margin:0;padding:0}
.foot-links a{display:inline-flex;align-items:center;min-height:32px;color:var(--text-2);font-size:14px;text-decoration:none}
.foot-links a:hover{text-decoration:underline;text-decoration-color:var(--accent)}
.foot-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border-strong);font-size:13px;color:var(--muted)}
.foot-legal{display:flex;flex-wrap:wrap;gap:20px}
.foot-legal a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-2)}
.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;min-height:80px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
@media(max-width:1180px){
 .site-head__row{gap:20px}.nav__list li+li::before{padding:0 8px}.head-tools{gap:10px}
}
@media(max-width:960px){
 .nav{display:none}.menu-toggle{display:flex}.head-tools{margin-left:auto}
 .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(min-width:961px){.mobile-drawer,.nav-veil{display:none!important}html.nav-open{overflow:auto}}
@media(max-width:768px){
 :root{--gutter:20px;--section-space:56px;--size-h1:clamp(28px,6vw,40px);--size-h2:30px;--size-h3:24px}
 .grid{grid-template-columns:1fr}.notice__more-text{display:none}
 .site-head__row{gap:12px;flex-wrap:nowrap}.head-tools{gap:10px}
 .brand{font-size:20px;gap:8px}.brand__mark{width:28px;height:28px}
}
@media(max-width:640px){
 .no-break{white-space:normal}
 .tilt,.tee-card,[data-tilt]{transform:none}
 .reading-wrap{padding-inline:var(--gutter)}
 .foot-grid{gap:28px}.foot-brand{grid-column:1/-1}
 .panel,.card{padding:22px}
}
@media(max-width:420px){
 :root{--gutter:16px}
 .brand{font-size:18px;gap:6px}.brand__mark{width:24px;height:24px}
 .site-head__row{gap:6px}.head-tools{gap:6px}
 .btn-login{padding-inline:10px;font-size:14px}
 .lang{font-size:12px;gap:3px;padding-inline:2px}
 .lang svg{display:none}
 .notice{font-size:12px}.notice__row{gap:8px}
 .foot-grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
 html{scroll-behavior:auto}
 *,*::before,*::after{animation:none!important;transition:none!important}
 .reveal,.reveal.pending{opacity:1;transform:none}
}