:root {
  --bg:#F6F6F2;
  --bg-panel:#FDFDFA;
  --bg-panel-2:#ECEDE6;
  --border:#DCDDD3;
  --accent:#4A6B22;
  --accent-dark:#33491A;
  --accent-2:#5E8430;
  --khaki:#8FA83E;
  --khaki-soft:#C9D78E;
  --text:#1C1E17;
  --text-muted:#62665A;
  --success:#2E8B57;
  --warn:#B7791F;
  --error:#C23B2A;
  --ink:#1A1D14;
  --ink-panel:#23271B;
  --white:#FFFFFF;
  --hero-top:#FBFBF8;
  --hero-bot:#EFF0E8;
  --sky-top:#EEF0E2;
  --sky-bot:#CDD4A6;
  --city-back-a:#BCC495;
  --city-back-b:#ADB684;
  --city-mid-a:#9AA475;
  --city-mid-b:#858F62;
  --city-front-a:#76815A;
  --city-front-b:#5F6A46;
  --city-win:#EEF1DC;
  --ground-top:#E6DFB9;
  --ground-top-2:#D8D0A2;
  --ground-face:#C5BB86;
  --ground-face-2:#AFA571;
  --ground-hl:#F7F4E1;
  --flag-red:#D1283A;
  --flag-white:#FFFFFF;
  --flag-navy:#23357A;
  --flag-black:#1D1D1B;
  --flag-gold:#F1C232;
  --font-display:'Iowan Old Style','Charter','Georgia','Songti SC','STSong','Noto Serif SC','Source Han Serif SC','Noto Serif CJK SC',serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Hiragino Kaku Gothic ProN','Apple SD Gothic Neo','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular','Menlo','Consolas','Liberation Mono',monospace;
  --r-xs:8px;
  --r-sm:12px;
  --r-md:14px;
  --r-lg:18px;
  --r-xl:24px;
  --r-pill:999px;
  --gutter:40px;
  --hl-inset:inset 0 1px 0 color-mix(in srgb,var(--white) 85%,transparent);
  --lift-1:0 1px 2px color-mix(in srgb,var(--accent) 8%,transparent),0 14px 32px -16px color-mix(in srgb,var(--accent) 22%,transparent);
  --lift-2:0 2px 6px color-mix(in srgb,var(--accent) 6%,transparent),0 24px 48px -20px color-mix(in srgb,var(--accent) 28%,transparent);
  --lift-panel:0 56px 96px -44px color-mix(in srgb,var(--accent) 34%,transparent),0 18px 40px -26px color-mix(in srgb,var(--accent) 20%,transparent);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:100px;-webkit-text-size-adjust:100%}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%}
img{display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
button,summary{font-family:inherit}
ul{list-style:none;margin:0;padding:0}
p{margin:0}
h1,h2,h3{font-family:var(--font-display);font-weight:400;line-height:1.18;letter-spacing:-.01em;text-wrap:balance}
h1{font-size:clamp(52px,5vw,72px)}
h2{font-size:clamp(34px,4vw,52px)}
h3{font-size:clamp(23px,2.6vw,32px)}
:where(a,button,summary,[role="tab"]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-sm);background:var(--ink-panel);color:var(--white)}
table{border-collapse:collapse}
th,td{word-break:keep-all}
th{white-space:nowrap}
.wrap{width:100%;max-width:1360px;margin-inline:auto;padding-inline:var(--gutter)}
.num{font-family:var(--font-mono);font-weight:500;font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sec{padding-top:88px;padding-bottom:88px}
.section-head{max-width:720px;margin-bottom:36px}
.section-head p{color:var(--text-muted)}
.panel-card{min-width:0;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--hl-inset),var(--lift-1)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;min-height:32px;padding:4px 14px 4px 12px;border:1px solid color-mix(in srgb,var(--accent) 18%,transparent);border-radius:var(--r-pill);background:color-mix(in srgb,var(--accent) 6%,var(--bg-panel));color:var(--accent-dark);font-size:13px;font-weight:500;letter-spacing:.03em}
.eyebrow-dot{width:8px;height:8px;flex-shrink:0;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 16%,transparent)}
.badge{display:inline-flex;align-items:center;max-width:100%;min-height:28px;padding:3px 10px;overflow:hidden;border-radius:var(--r-pill);background:var(--bg-panel-2);color:var(--accent-dark);font-size:12px;font-weight:600}
.btn-primary,.btn-secondary,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:8px 22px;border-radius:var(--r-pill);font-size:15px;font-weight:600;white-space:nowrap;flex-shrink:0;transition:transform .2s,border-color .2s,background-color .2s}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--white);box-shadow:var(--hl-inset),var(--lift-1)}
.btn-primary:hover,.cta-main:hover{transform:translateY(-1px)}
.btn-secondary,.btn-ghost{border:1px solid color-mix(in srgb,var(--text) 24%,transparent);background:var(--bg-panel);color:var(--text)}
.btn-secondary:hover,.btn-ghost:hover{border-color:var(--accent);color:var(--accent-dark)}
.notice{background:var(--ink);color:color-mix(in srgb,var(--white) 86%,transparent);font-size:13px;letter-spacing:.02em}
.notice-inner{min-height:36px;display:flex;align-items:center;justify-content:center;gap:12px;padding-top:6px;padding-bottom:6px;text-align:center;flex-wrap:wrap}
.notice-link{color:var(--khaki);font-weight:600;border-bottom:1px solid color-mix(in srgb,var(--khaki) 45%,transparent)}
.notice-link:hover{color:var(--khaki-soft)}
.site-head{position:relative;z-index:30;background:color-mix(in srgb,var(--hero-top) 92%,transparent);border-bottom:1px solid color-mix(in srgb,var(--border) 70%,transparent)}
.head-row{height:72px;display:flex;align-items:center;gap:40px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{width:34px;height:34px;flex-shrink:0}
.brand-word{font-size:19px;font-weight:700;letter-spacing:.04em}
.brand-zh{font-size:14px;color:var(--text-muted)}
.nav-main{flex:1;min-width:0}
.nav-list{display:flex;align-items:center;gap:6px;list-style:none;margin:0;padding:0}
.nav-list>li>a,.more-trigger{display:inline-flex;align-items:center;min-height:40px;padding:6px 14px;border-radius:var(--r-pill);font-size:15px;white-space:nowrap}
.nav-list>li>a:hover,.more-trigger:hover{background:color-mix(in srgb,var(--accent) 7%,transparent);color:var(--accent-dark)}
.nav-list a[aria-current="page"],.more-panel a[aria-current="page"]{color:var(--accent-dark);font-weight:700}
.nav-more{position:relative}
.more-trigger{cursor:pointer}
.more-trigger::after{content:"⌄";margin-left:4px}
.more-panel{position:absolute;top:100%;left:-12px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;width:420px;padding:14px;border-radius:var(--r-lg);background:var(--bg-panel);box-shadow:var(--hl-inset),0 0 0 1px var(--border),var(--lift-2);opacity:0;visibility:hidden;transform:translateY(-4px);transition:opacity .2s,transform .2s,visibility .2s}
.nav-more:hover .more-panel,.nav-more:focus-within .more-panel,.nav-more.is-open .more-panel{opacity:1;visibility:visible;transform:none}
.more-label{padding:4px 10px;color:var(--text-muted);font-size:12px}
.more-group a{display:block;padding:9px 10px;border-radius:var(--r-sm);font-size:14px}
.more-group a:hover{background:var(--bg-panel-2)}
.head-tools{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.lang-picker{position:relative}
.lang-trigger{min-height:40px;display:inline-flex;align-items:center;gap:7px;padding:5px 10px;border-radius:var(--r-pill);color:var(--text-muted);font-size:14px}
.lang-trigger span{white-space:nowrap}
.lang-trigger svg{width:16px;height:16px;flex-shrink:0}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);width:164px;padding:6px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--lift-2)}
.lang-menu[hidden]{display:none}
.lang-menu a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-xs)}
.lang-menu a:hover{background:var(--bg-panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:6px 22px;border:1px solid var(--text);border-radius:var(--r-pill);background:var(--bg-panel);font-size:14px;font-weight:600;white-space:nowrap}
.btn-login:hover{background:var(--text);color:var(--bg-panel)}
.menu-trigger{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--bg-panel)}
.menu-trigger svg{width:20px;height:20px}
.mobile-nav{display:none}
.reveal{transition:opacity .65s ease,transform .65s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.site-footer{background:var(--ink);color:var(--white);padding-top:64px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin-top:16px;color:color-mix(in srgb,var(--white) 70%,transparent);font-size:14px}
.footer-brand .brand-word{color:var(--white)}
.footer-title{margin:0 0 14px;color:var(--khaki-soft);font-size:13px;letter-spacing:.08em}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-bottom a,.footer-lang a{display:inline-flex;align-items:center;min-height:28px;color:color-mix(in srgb,var(--white) 78%,transparent);font-size:13px}
.footer-links a:hover,.footer-bottom a:hover,.footer-lang a:hover{color:var(--khaki-soft)}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:48px;padding-top:20px;padding-bottom:28px;border-top:1px solid color-mix(in srgb,var(--white) 15%,transparent);font-size:12px;color:color-mix(in srgb,var(--white) 65%,transparent)}
.footer-lang,.footer-legal{display:flex;gap:10px 18px;flex-wrap:wrap}
#server-status{position:relative;display:block;max-width:100%;overflow:hidden;margin-bottom:32px}
#server-status + *{margin-top:32px}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol{margin:0 0 1.2em}
.prose h2{margin:1.6em 0 .55em}
.prose h3{margin:1.4em 0 .5em}
.prose a:not(.btn-primary):not(.btn-secondary){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose pre{overflow-x:auto}
body:has(.toc-tabs) section[id]{scroll-margin-top:132px}
@media(max-width:1100px){
  .head-row{gap:20px}
  .nav-list>li>a,.more-trigger{padding-inline:9px;font-size:14px}
}
@media(max-width:900px){
  .nav-main{display:none}
  .head-row{justify-content:space-between}
  .head-row .head-tools{position:fixed;right:var(--gutter);top:46px;margin-left:auto}
  .menu-trigger{display:inline-flex}
  .mobile-nav{position:absolute;z-index:32;left:var(--gutter);right:var(--gutter);top:100%;max-height:calc(100dvh - 110px);overflow-y:auto;overscroll-behavior:contain;padding:10px;border:1px solid var(--border);border-radius:0 0 var(--r-lg) var(--r-lg);background:var(--bg-panel);box-shadow:var(--lift-2)}
  .mobile-nav.is-open{display:block}
  .mobile-nav a{display:flex;width:100%;min-height:46px;align-items:center;padding:10px 14px;border-radius:var(--r-xs)}
  .mobile-nav a:hover,.mobile-nav a[aria-current="page"]{background:var(--bg-panel-2);color:var(--accent-dark)}
  .mobile-nav-label{padding:10px 14px 4px;color:var(--text-muted);font-size:12px}
  .mobile-nav .mobile-language{border-top:1px solid var(--border);margin-top:8px}
}
@media(max-width:768px){
  :root{--gutter:24px}
  h1{font-size:clamp(28px,7vw,40px);line-height:1.15}
  .sec{padding-top:64px;padding-bottom:64px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:18px}
  .no-break{white-space:normal}
  .head-row{height:64px;gap:8px}
  .brand-word{font-size:17px}
  .brand-mark{width:30px;height:30px}
  .head-tools{gap:3px;margin-left:auto}
  .btn-login{order:-1}
  .menu-trigger{order:0}
  .lang-picker{order:1}
  .lang-trigger{padding-inline:6px}
  .lang-trigger span{display:none}
  .btn-login{min-height:40px;padding-inline:13px}
  .mobile-nav{max-width:100%}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tilt,.micro-tilt{transform:none}
  .prose,.wrap,main,section,article{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}