:root{
  color-scheme:light;
  --bg:#F7EFE2;
  --bg-panel:#FCF8F1;
  --bg-panel-2:#EFE5D4;
  --border:#E2D5C0;
  --accent:#B33A4A;
  --accent-dark:#8A2836;
  --amber:#D9822B;
  --text:#2A1E17;
  --text-muted:#6E5E50;
  --success:#3F7A4E;
  --warn:#B7791F;
  --error:#C4361C;
  --hero-top:#FBF6EC;
  --hero-bottom:#F1E6D3;
  --paper-hi:#FFFCF7;
  --cocoa:#1C140F;
  --cocoa-2:#2A1F18;
  --on-dark:#F7EFE2;
  --on-dark-muted:rgba(247,239,226,.66);
  --on-dark-faint:rgba(247,239,226,.24);
  --accent-on-dark:#E8808D;
  --success-on-dark:#86BC93;
  --accent-a06:rgba(179,58,74,.06);
  --accent-a10:rgba(179,58,74,.10);
  --accent-a16:rgba(179,58,74,.16);
  --accent-a40:rgba(179,58,74,.40);
  --amber-a30:rgba(217,130,43,.30);
  --amber-a40:rgba(217,130,43,.42);
  --success-a12:rgba(63,122,78,.12);
  --text-a14:rgba(42,30,23,.14);
  --text-a22:rgba(42,30,23,.22);
  --white-a16:rgba(255,255,255,.18);
  --sky-top:#F3D9B8;
  --sky-mid:#E2B48C;
  --sky-bottom:#C98F6A;
  --city-far:#B7865F;
  --city-mid:#8C5E43;
  --city-near:#4A3226;
  --lamp:#F5C873;
  --sun-core:rgba(255,242,216,.95);
  --sun-mid:rgba(255,230,190,.55);
  --sun-halo:rgba(255,226,180,0);
  --glare:rgba(255,255,255,.16);
  --rim:rgba(255,255,255,.62);
  --rim-soft:rgba(255,255,255,.7);
  --glass-cocoa:rgba(28,20,15,.74);
  --glass-edge:rgba(255,242,224,.18);
  --chip-glass:rgba(252,248,241,.84);
  --flag-red:var(--accent);
  --flag-white:#FFFDF8;
  --flag-navy:#26305C;
  --flag-edge:rgba(42,30,23,.16);
  --shadow-panel:inset 0 1px 0 rgba(255,255,255,.75),0 30px 60px -24px rgba(179,58,74,.28),0 8px 18px -8px rgba(42,30,23,.12);
  --shadow-pill:0 22px 48px -18px rgba(179,58,74,.30),0 3px 10px -2px rgba(42,30,23,.06);
  --shadow-frame:0 46px 90px -36px rgba(179,58,74,.34),0 16px 34px -18px rgba(74,50,38,.30);
  --shadow-glass:0 26px 50px -20px rgba(28,20,15,.55),inset 0 1px 0 rgba(255,242,224,.14);
  --shadow-btn:0 10px 22px -10px rgba(138,40,54,.62),inset 0 1px 0 rgba(255,255,255,.18);
  --shadow-chip:0 14px 30px -14px rgba(179,58,74,.34),0 2px 6px -2px rgba(42,30,23,.08);
  --shadow-badge:0 6px 16px -10px rgba(179,58,74,.30);
  --shadow-dot:inset 0 -1px 0 rgba(0,0,0,.18);
  --shadow-card:0 24px 60px -28px rgba(179,58,74,.10),inset 0 1px 0 rgba(255,255,255,.75);
  --font-display:"Iowan Old Style","Palatino Linotype",Georgia,"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC","Hiragino Mincho ProN","Nanum Myeongjo",serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR",-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-regular:400;
  --weight-medium:500;
  --weight-strong:600;
  --weight-brand:650;
  --r-xs:3px;
  --r-sm:8px;
  --r-line:10px;
  --r-md:12px;
  --r-inset:14px;
  --r-lg:18px;
  --r-stamp:20px;
  --r-xl:22px;
  --r-mobile-frame:24px;
  --r-frame:32px;
  --r-pill:999px;
  --r-circle:50%;
  --container:1328px;
  --reading-width:820px;
  --gutter:24px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-5:48px;
  --space-6:64px;
  --section-space:80px;
  --header-height:68px;
  --anchor-offset:84px;
  --toc-top:12px;
  --toc-offset:88px;
  --font-small:13px;
  --font-body-size:16px;
  --font-lede:18px;
  --font-h1:clamp(52px,4.45vw,64px);
  --font-h2:clamp(30px,3.2vw,44px);
  --font-h3:24px;
  --ease-out:cubic-bezier(.2,.7,.2,1);
  --transition-fast:.2s;
  --transition-reveal:.55s;
  --grain-opacity:.03;
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
*,*::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(--font-body-size);line-height:1.6;-webkit-font-smoothing:antialiased}
body::after{content:"";position:fixed;inset:0;pointer-events:none;background-image:var(--grain);background-size:180px 180px;opacity:var(--grain-opacity);mix-blend-mode:multiply;z-index:60}
h1,h2,h3,h4,p,ul,ol,dl,dd,blockquote,figure{margin:0}
h1,h2,h3{font-weight:var(--weight-regular);overflow-wrap:break-word;text-wrap:balance}
h1{font-family:var(--font-display);font-size:var(--font-h1);line-height:1.12;letter-spacing:-.02em}
h2{font-family:var(--font-display);font-size:var(--font-h2);line-height:1.22;letter-spacing:-.02em}
h3{font-size:var(--font-h3);line-height:1.35}
ul,ol{padding-left:1.5em}
a{color:var(--accent-dark);text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,summary,a{-webkit-tap-highlight-color:var(--accent-a16)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled{cursor:not-allowed}
img,svg{vertical-align:middle;max-width:100%}
img{height:auto}
[hidden]{display:none!important}
main,section,article,nav,header,footer,div{min-width:0}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--cocoa);color:var(--on-dark);border-radius:var(--r-md);font-family:var(--font-mono);font-size:14px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin-block:var(--space-4)}
.wrap{max-width:var(--container);width:100%;margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{max-width:var(--reading-width);width:100%;margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-head{max-width:var(--reading-width);margin-bottom:var(--space-4)}
.section-head p{margin-top:var(--space-2);color:var(--text-muted)}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.kicker{font-size:var(--font-small);letter-spacing:.08em;color:var(--accent-dark);margin-bottom:var(--space-2)}
.panel,.card{padding:var(--space-4);border:1px solid var(--border);border-radius:var(--r-lg);background:var(--bg-panel);box-shadow:var(--shadow-card)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.card-grid>*{min-width:0}
.prose{overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote,.prose .table-scroll{margin-block:var(--space-3)}
.prose h2{margin-top:var(--space-6);margin-bottom:var(--space-3)}
.prose h3{margin-top:var(--space-4);margin-bottom:var(--space-2)}
.prose li+li{margin-top:var(--space-1)}
.prose a{overflow-wrap:anywhere}
.decorative-region,.tilt-region{position:relative;overflow-x:clip;max-width:100%}
.tilt{transform:rotate(-2deg)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 22px;border:1px solid transparent;text-decoration:none;font-family:var(--font-body);font-size:15px;font-weight:var(--weight-medium);cursor:pointer;transition:transform var(--transition-fast) var(--ease-out),background var(--transition-fast) var(--ease-out);flex-shrink:0;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn-primary{height:48px;padding:0 10px 0 24px;border-radius:var(--r-pill);background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:var(--paper-hi);font-size:15.5px;font-weight:var(--weight-strong);letter-spacing:.03em;box-shadow:var(--shadow-btn)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn-primary:active,.btn-primary.is-active{transform:translateY(1px)}
.btn-primary .arr{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:var(--r-circle);background:var(--white-a16);font-size:15px;line-height:1}
.btn-secondary{border-color:var(--border);border-radius:var(--r-pill);background:var(--bg-panel);color:var(--text)}
.btn-secondary:hover{border-color:var(--accent);background:var(--accent-a06)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;pointer-events:none;box-shadow:none}
.btn-text{min-height:24px;margin:14px 0 0 22px;padding:0 0 2px;border:0;border-bottom:1px solid var(--border);border-radius:0;font-size:14px;color:var(--text);background:none}
.btn-text:hover{border-bottom-color:var(--accent);color:var(--accent-dark)}
.btn-text svg{width:14px;height:14px;display:block;color:var(--accent);flex-shrink:0}
.button-row{display:flex;align-items:center;flex-wrap:wrap;gap:var(--space-2)}
.badge{display:inline-flex;align-items:center;gap:9px;min-height:30px;padding:4px 14px 4px 11px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--bg-panel);font-size:13px;color:var(--text-muted);box-shadow:var(--shadow-badge);max-width:100%;overflow-wrap:anywhere}
.badge-dot{width:8px;height:8px;border-radius:var(--r-circle);background:var(--accent);box-shadow:0 0 0 3px var(--accent-a16);flex-shrink:0}
.tag{display:inline-block;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:4px 10px;border-radius:var(--r-sm);background:var(--accent-a10);color:var(--accent-dark);font-size:12px}
.announce{background:var(--cocoa);color:var(--on-dark-muted);font-size:13px;letter-spacing:.02em}
.announce .wrap{min-height:36px;display:flex;align-items:center;justify-content:center;gap:14px;padding-block:4px}
.announce b{color:var(--on-dark);font-weight:var(--weight-strong)}
.announce-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent-on-dark);font-weight:var(--weight-strong);text-decoration:none;border-bottom:1px solid var(--accent-a40);white-space:nowrap}
.announce-link:hover{border-bottom-color:var(--accent-on-dark)}
.site-header{position:relative;z-index:30;border-bottom:1px solid var(--border);background:var(--hero-top)}
.nav-inner{min-height:var(--header-height);display:flex;align-items:center;gap:32px;position:relative}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0;min-height:32px}
.logo{width:32px;height:32px;display:block;flex-shrink:0}
.brand-en{font-size:19px;font-weight:var(--weight-brand);letter-spacing:.04em}
.brand-zh{font-size:15px;font-weight:var(--weight-medium);color:var(--text-muted)}
.site-nav{margin-right:auto}
.nav-list{display:flex;align-items:center;gap:20px;list-style:none;margin:0;padding:0}
.nav-list a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--text-muted);text-decoration:none;white-space:nowrap}
.nav-list a:hover{color:var(--text)}
.nav-list a[aria-current="page"]{color:var(--text);font-weight:var(--weight-strong)}
.nav-tools{display:flex;align-items:center;gap:16px;flex-shrink:0;margin-left:auto}
.language-picker{position:relative}
.lang-switch{display:inline-flex;align-items:center;justify-content:center;background:none;border:0;padding:8px 0;min-height:32px;min-width:44px;width:auto;font:inherit;font-size:14px;color:var(--text-muted);white-space:nowrap}
.lang-switch span{white-space:nowrap}
.lang-switch:hover{color:var(--text)}
.language-menu{position:absolute;right:0;top:calc(100% + 8px);width:180px;max-width:calc(100vw - 32px);padding:8px;list-style:none;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel);z-index:34}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;color:var(--text);border-radius:var(--r-sm)}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--accent-a10)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:7px 22px;border:1px solid var(--text);border-radius:var(--r-pill);color:var(--text);font-size:14px;font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap}
.btn-login:hover{background:var(--text);color:var(--paper-hi)}
.nav-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel);color:var(--text);font-size:22px}
.mobile-nav{display:none}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr .8fr;gap:var(--space-5)}
.footer-brand p{margin-top:var(--space-2);max-width:300px;color:var(--text-muted);font-size:14px}
.footer-heading{font:var(--weight-strong) 14px/1.5 var(--font-body);margin-bottom:var(--space-2)}
.footer-links{display:grid;gap:4px;list-style:none;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-muted);font-size:14px;text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--space-2);margin-top:var(--space-5);padding-top:var(--space-3);border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:var(--space-3)}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-muted)}
.reveal{transition:opacity var(--transition-reveal) var(--ease-out),transform var(--transition-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:var(--space-3);margin-bottom:var(--space-4)}
#server-status+*{margin-top:var(--space-3)}
#server-status>*{min-width:0;max-width:100%}
@media(max-width:1180px){
  .nav-inner{gap:20px}
  .nav-list{gap:14px}
  .nav-list a{font-size:13px}
  .nav-tools{gap:12px}
  .btn-login{padding-inline:16px}
}
@media(max-width:1080px){
  .site-nav{display:none}
  .nav-tools{margin-left:auto}
  .nav-toggle{display:inline-flex}
  .mobile-nav{position:absolute;top:100%;left:var(--gutter);right:var(--gutter);z-index:35;background:var(--bg-panel);border:1px solid var(--border);border-radius:0 0 var(--r-lg) var(--r-lg);box-shadow:var(--shadow-panel);max-height:calc(100dvh - var(--header-height) - 40px);overflow-y:auto;overscroll-behavior:contain;padding:12px}
  .mobile-nav:not([hidden]){display:block}
  .mobile-nav ul{list-style:none;margin:0;padding:0}
  .mobile-nav a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 16px;color:var(--text);text-decoration:none;border-radius:var(--r-sm)}
  .mobile-nav a:hover,.mobile-nav a[aria-current="page"]{background:var(--accent-a10);color:var(--accent-dark)}
  .mobile-languages{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}
}
@media(max-width:768px){
  :root{--section-space:56px;--font-h1:38px;--font-h2:32px}
  .card-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-4)}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decorative-region,.tilt-region{max-width:100%;overflow-x:clip}
  .nav-inner{gap:12px}
  .nav-tools{margin-left:auto;gap:8px}
  .language-picker{display:none}
  .brand-en{font-size:17px}
  .btn-login{min-height:44px;padding-inline:14px}
  .announce{font-size:12px}
  .announce .wrap{gap:10px}
  .panel,.card{padding:var(--space-3)}
  .btn-primary{height:44px;padding:0 8px 0 16px;font-size:14.5px}
  .btn-primary .arr{width:26px;height:26px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .announce .wrap{gap:8px;font-size:11px}
  .brand{gap:7px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.btn-login{transition:none}
  .btn:hover{transform:none}
}