:root {
  --bg:#FCFCF9;
  --panel:#FFFFFF;
  --panel-2:#F2F4EE;
  --panel-shade:#F4F6F0;
  --stub:#F7F8F3;
  --border:#E3E6DE;
  --dash:#C7CEC2;
  --accent:#9FE58A;
  --accent-hi:#BDF0AC;
  --accent-soft:#DCF4D2;
  --accent-dark:#1F5C37;
  --text:#1C2621;
  --muted:#5E6A63;
  --faint:#97A19A;
  --success:#2E9E5B;
  --warn:#D9961A;
  --error:#D3473F;
  --candy-pink:#F3C6F1;
  --candy-honey:#FFD98A;
  --candy-sky:#AED8FF;
  --flag-red:#D7262E;
  --flag-blue:#1E3A8A;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(28,38,33,.14);
  --grid-line:rgba(31,92,55,.04);
  --wash:rgba(159,229,138,.07);
  --wash-clear:rgba(159,229,138,0);
  --glow-honey:rgba(255,217,138,.55);
  --glow-clear:rgba(255,217,138,0);
  --shadow-tint:rgba(31,92,55,.10);
  --shadow-tint-2:rgba(31,92,55,.07);
  --shadow-soft:rgba(31,92,55,.05);
  --edge:rgba(31,92,55,.08);
  --hi-line:rgba(255,255,255,.65);
  --hi-soft:rgba(255,255,255,.55);
  --sheen:rgba(255,255,255,.95);
  --sheen-clear:rgba(255,255,255,0);
  --mask-on:#000;
  --mask-off:transparent;
  --veil:rgba(28,38,33,.24);
  --r-small:6px;
  --r-control:8px;
  --r-well:12px;
  --r-bubble:14px;
  --r-tile:18px;
  --r-panel:24px;
  --r-mobile:28px;
  --r-pill:999px;
  --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","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --size-body:17px;
  --size-small:13px;
  --size-label:15px;
  --size-sub:19px;
  --size-h1:clamp(52px,4.6vw,68px);
  --size-h2:clamp(28px,3vw,40px);
  --size-h3:24px;
  --gutter:16px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-5:48px;
  --space-6:64px;
  --space-7:80px;
  --page-width:1312px;
  --reading-width:832px;
  --head-height:72px;
  --anchor-offset:88px;
  --toc-offset:96px;
  --panel-shadow:0 12px 32px var(--shadow-tint),inset 0 1px 0 var(--hi-line);
  --ease: .2s ease;
  --tear:62px;
  --notch:6px;
}
*,*::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;font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;color:var(--text);background-color:var(--bg);background-image:linear-gradient(var(--grid-line) 1px,var(--mask-off) 1px),linear-gradient(90deg,var(--grid-line) 1px,var(--mask-off) 1px);background-size:64px 64px;background-position:center top}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul{margin:0;padding:0;list-style:none}
p{margin:0 0 var(--space-3)}
h1,h2,h3{font-family:var(--font-display);font-weight:800;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:1.1;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h2{font-size:var(--size-h2);line-height:1.2;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h3{font-size:var(--size-h3);line-height:1.3;margin:0 0 var(--space-2)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.sec{padding-top:var(--space-7);padding-bottom:var(--space-7)}
.grid-two,.grid-three{display:grid;gap:var(--space-3)}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
:where(.grid-two,.grid-three)>*{min-width:0}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-panel);padding:var(--space-4);box-shadow:var(--panel-shadow);min-width:0}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.prose{min-width:0;overflow-wrap:break-word}
.prose p{line-height:1.85}
.prose h2,.prose h3{margin-top:var(--space-5)}
.prose ul,.prose ol{padding-left:var(--space-3);margin-bottom:var(--space-3)}
.prose ul{list-style:disc}
.prose a{text-decoration:underline;text-underline-offset:4px;color:var(--accent-dark)}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-small);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-tile)}
pre code{padding:0;background:none;white-space:pre;overflow-wrap:normal}
.btn,.btn-primary,.btn-secondary,.btn-ghost,.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:10px;flex-shrink:0;white-space:nowrap;border-radius:var(--r-pill);font-weight:600;min-height:44px;transition:transform var(--ease),background-color var(--ease),box-shadow var(--ease)}
.btn,.btn-secondary{padding:10px 24px;border:1px solid var(--text);background:var(--panel);font-size:var(--size-label)}
.btn-primary{height:52px;padding:0 26px 0 30px;border:0;background:linear-gradient(180deg,var(--accent-hi),var(--accent));box-shadow:inset 0 1px 0 var(--hi-line),0 6px 14px var(--shadow-tint-2);font-size:var(--size-body);font-weight:700;color:var(--accent-dark)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hi-line),0 10px 20px var(--shadow-tint)}
.btn-primary:active,.btn-secondary:active{transform:translateY(1px)}
.btn-primary:disabled{background:var(--panel-2);color:var(--muted);box-shadow:none}
.btn-secondary:hover,.btn-login:hover{background:var(--panel-2);transform:translateY(-1px)}
.btn-ghost{height:44px;margin-top:14px;padding:0 24px;border:1px solid var(--border);background:var(--panel);font-size:var(--size-label);box-shadow:0 4px 12px var(--shadow-soft)}
.btn-ghost:hover{border-color:var(--text);transform:translateY(-1px)}
.btn-login{height:42px;min-height:42px;padding:0 22px;border:1px solid var(--text);font-size:var(--size-label);background:var(--panel)}
.text-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent-dark);text-decoration:underline;text-underline-offset:5px;font-weight:600}
.ico-s{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.site-head{background:var(--panel);border-bottom:1px solid var(--border);position:relative;z-index:50}
.head-inner{width:min(1280px,100% - 32px);margin:0 auto;height:var(--head-height);display:flex;align-items:center;gap:32px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand img{width:36px;height:36px;display:block}
.brand-word{font-family:var(--font-display);font-weight:800;font-size:21px;letter-spacing:-.02em;color:var(--text)}
.brand-word em{font-style:normal;color:var(--accent-dark)}
.nav-dots{flex:1;display:flex;justify-content:center;min-width:0}
.nav-dots ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;white-space:nowrap}
.nav-dots li{display:flex;align-items:center}
.nav-dots li+li::before{content:"·";color:var(--dash);font-weight:700;padding:0 12px}
.nav-dots a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--size-label);font-weight:500;padding:6px 2px;border-radius:var(--r-control);transition:color var(--ease)}
.nav-dots a:hover,.nav-dots a[aria-current="page"]{color:var(--accent-dark)}
.nav-dots a[aria-current="page"]{font-weight:700}
.head-tools{display:flex;align-items:center;gap:18px;flex:none}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:14px;font-weight:500;color:var(--muted);padding:8px 4px;min-height:44px;min-width:44px;width:auto;border:0;background:var(--mask-off)}
.lang span{white-space:nowrap}
.language-menu{position:absolute;right:0;top:100%;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-tile);box-shadow:var(--panel-shadow);z-index:55}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-control);font-size:14px}
.language-menu a:hover,.language-menu a[aria-current]{background:var(--panel-2);color:var(--accent-dark)}
.menu-toggle{display:none;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-well);background:var(--panel)}
.nav-drawer{display:none}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;z-index:40;border:0;background:var(--veil)}
.notice{background:var(--accent-soft);border-bottom:1px solid var(--edge)}
.notice-inner{width:min(1280px,100% - 32px);margin:0 auto;min-height:44px;display:flex;align-items:center;justify-content:center;gap:12px;font-size:var(--size-label);color:var(--accent-dark)}
.badge-new{display:inline-grid;place-items:center;flex-shrink:0;min-width:30px;height:24px;padding:0 7px;border-radius:var(--r-small);background:var(--accent-dark);color:var(--bg);font-size:var(--size-small);font-weight:700}
.notice-text b{font-weight:700}
.notice-more{display:inline-flex;align-items:center;min-height:24px;font-weight:600;border-bottom:1px solid var(--mask-off)}
.notice-more:hover{border-bottom-color:var(--accent-dark)}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:var(--space-6);padding-bottom:var(--space-4);margin-top:var(--space-6)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:var(--space-4)}
.footer-grid>*{min-width:0}
.footer-brand p{color:var(--muted);font-size:var(--size-label);margin-top:var(--space-2);max-width:32ch}
.footer-heading{font-size:var(--size-label);font-weight:700;margin:0 0 var(--space-2)}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--muted);padding-block:4px}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:var(--space-2);border-top:1px dashed var(--dash);margin-top:var(--space-4);padding-top:var(--space-3);font-size:var(--size-small);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:var(--space-3)}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.reveal{transition:opacity .6s ease,transform .6s 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-top:var(--space-3);margin-bottom:var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
.decor-section,.stripe-halo-container{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1180px){.head-inner{gap:20px}.nav-dots li+li::before{padding:0 7px}.head-tools{gap:12px}}
@media(max-width:980px){
  .head-inner{height:var(--head-height);gap:12px}
  .nav-dots{display:none}
  .head-tools{margin-left:auto;gap:8px}
  .menu-toggle{display:inline-flex;align-items:center;justify-content:center}
  .nav-drawer{position:absolute;left:0;right:0;top:100%;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:0 18px 32px var(--shadow-tint);max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;padding:16px;z-index:51}
  .nav-drawer:not([hidden]){display:block}
  .nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-control)}
  .nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--panel-2);color:var(--accent-dark)}
  .drawer-languages{border-top:1px dashed var(--dash);margin-top:var(--space-2);padding-top:var(--space-2)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .grid-three{grid-template-columns:1fr}
  .sec{padding-top:var(--space-5);padding-bottom:var(--space-5)}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .grid-two,.footer-grid{grid-template-columns:1fr}
  .panel,.card{padding:var(--space-3)}
  .head-tools{margin-left:auto;gap:4px}
  .brand{gap:6px}.brand-word{font-size:18px}.brand img{width:30px;height:30px}
  .btn-login{padding:0 14px}
  .lang span{display:none}
  .tilt{transform:none}
  .decor-section,.stripe-halo-container{max-width:100%;overflow-x:clip}
  .notice-inner{font-size:14px;gap:8px;flex-wrap:wrap;padding-block:8px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.btn-primary,.btn-secondary,.btn-ghost,.btn-login{transition:none}
}