:root {
  --bg:#F6F7F2; --panel:#FDFDFB; --panel-2:#EEEFE8; --panel-2-hover:#E7E8E0;
  --panel-3:#F4F5EF; --border:#E1E2D9; --border-strong:#D2D3C9;
  --accent:#C9762E; --accent-2:#E3A15A; --accent-dark:#9C5A1F;
  --text:#1E1D1A; --text-2:#3E3D38; --muted:#6A6962; --faint:#95948B;
  --success:#2F8A5A; --warn:#B9860F; --error:#BE3F37;
  --ink:#1E1D1A; --ink-line:#3A3934; --on-ink:#FDFDFB;
  --hi-edge:rgba(255,255,255,.9); --hi-soft:rgba(255,255,255,.26);
  --veil-06:rgba(30,29,26,.06); --veil-10:rgba(30,29,26,.10);
  --veil-16:rgba(30,29,26,.16); --veil-24:rgba(30,29,26,.24);
  --accent-a10:rgba(201,118,46,.10); --accent-a12:rgba(201,118,46,.12);
  --accent-a14:rgba(201,118,46,.14); --accent-a22:rgba(201,118,46,.22);
  --accent-a40:rgba(201,118,46,.40);
  --amber-a04:rgba(227,161,90,.04); --amber-a07:rgba(227,161,90,.07);
  --success-a16:rgba(47,138,90,.16);
  --dot-r:#DFA69D; --dot-y:#E4C98C; --dot-g:#A9C8AD;
  --sky-1:#D8D6CE; --sky-2:#E7DFD1; --sky-3:#F1DCC2; --cloud:#F8F3EA;
  --mtn-far-1:#BAC2C1; --mtn-far-2:#D5D5CC;
  --mtn-mid-1:#9CACA7; --mtn-mid-2:#B7BFB6;
  --mtn-near-1:#7A9087; --mtn-near-2:#5F756C; --mtn-shade:#50655D;
  --sea-1:#B8C1BD; --sea-2:#92A1A6; --sea-3:#71838B; --glint:#F0E9DB;
  --flag-white:#FFFFFF; --flag-red-jp:#BC002D; --flag-red-hk:#DE2910;
  --flag-red-us:#B22234; --flag-blue-us:#3C3B6E; --flag-red-sg:#E5333F;
  --flag-green-it:#009246; --flag-red-it:#CE2B37; --flag-red-ch:#D52B1E;
  --flag-edge:rgba(30,29,26,.16);
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-pill:999px; --r-scroll:12px; --r-win:11px; --r-card:10px;
  --r-ui:7px; --r-chip:6px; --gutter:24px;
  --shadow-win:0 36px 72px -12px var(--accent-a10),0 16px 32px -16px var(--veil-16);
  --shadow-sub:0 40px 80px -10px var(--accent-a12),0 18px 36px -18px var(--veil-24);
  --shadow-float:0 16px 36px -10px var(--accent-a12),0 4px 12px -6px var(--veil-16);
  --shadow-btn:0 10px 24px -10px var(--accent-a40),inset 0 1px 0 var(--hi-soft);
  --shadow-knob:0 1px 3px var(--veil-24);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:78px;scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font:400 15px/1.6 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:clip}
a{color:inherit}
a:hover,.text-link{color:var(--accent-dark)}
button{font:inherit;cursor:pointer}
img,svg{max-width:100%}
img{height:auto}
svg{flex-shrink:0}
code{overflow-wrap:anywhere;font-family:var(--font-mono)}
pre{max-width:100%;overflow-x:auto;padding:18px;background:var(--panel-2);border-radius:var(--r-card)}
pre code{overflow-wrap:normal}
h1,h2,h3{font-family:var(--font-display);line-height:1.2;letter-spacing:-.02em;text-wrap:balance}
h1{font-size:clamp(52px,5.2vw,72px);font-weight:500}
h2{font-size:clamp(28px,3.2vw,42px);font-weight:500}
h3{font-size:21px;font-weight:600}
p{margin:0 0 1em}
ul,ol{padding-left:1.5em}
:where(a,button,summary,[role="tab"],[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono)}
.wrap{width:100%;max-width:1248px;margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:80px;padding-bottom:80px}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:inset 0 1px 0 var(--hi-edge)}
.card{padding:24px}
.muted{color:var(--muted)}
.eyebrow{font:500 12px/1.5 var(--font-mono);letter-spacing:.05em;color:var(--muted)}
.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;max-width:100%;overflow:hidden;margin-bottom:24px}
#server-status + *{margin-top:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 24px;border:1px solid transparent;border-radius:var(--r-pill);font-size:15.5px;font-weight:500;text-decoration:none;line-height:1;white-space:nowrap;transition:background-color .18s,border-color .18s,box-shadow .18s;flex-shrink:0}
.btn svg{width:16px;height:16px}
.btn-primary{color:var(--on-ink);background-color:var(--accent);background-image:linear-gradient(180deg,var(--accent),var(--accent-dark));box-shadow:var(--shadow-btn)}
.btn-primary:hover{color:var(--on-ink);background-image:none;background-color:var(--accent-dark)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--panel-2);border-color:var(--border)}
.btn-ghost:hover,.btn-secondary:hover{color:var(--text);background:var(--panel-2-hover);border-color:var(--border-strong)}
.btn-dark{background:var(--ink);color:var(--on-ink)}
.btn-dark:hover{background:var(--ink-line);color:var(--on-ink)}
/* Header: the brand, desktop navigation, tools and drawer are siblings. */
.site-head{position:relative;z-index:50}
.head-in{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;min-height:60px;gap:12px}
.brand{display:inline-flex;align-items:center;gap:10px;justify-self:start;text-decoration:none;color:var(--text);white-space:nowrap}
.brand:hover{color:var(--text)}
.brand-mark{display:block;width:28px;height:28px;flex:none}
.brand-en{font-size:17px;font-weight:600;letter-spacing:-.01em}
.brand-zh{font-size:14px;font-weight:400;color:var(--muted)}
.primary-nav ul{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.primary-nav a,.more-btn{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:34px;padding:0 14px;border:0;border-radius:var(--r-pill);background:none;color:var(--text-2);font:400 14.5px/1 var(--font-body);text-decoration:none;white-space:nowrap}
.primary-nav a:hover,.more-btn:hover{color:var(--accent)}
.primary-nav .is-current{font-weight:500;color:var(--text)}
.nav-more{position:relative}
.more-caret{font-size:11px;color:var(--faint)}
.more-panel{position:absolute;top:calc(100% + 8px);left:50%;width:400px;display:grid;grid-template-columns:1fr 1fr;gap:4px 12px;padding:12px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-scroll);box-shadow:var(--shadow-float);opacity:0;visibility:hidden;transform:translate(-50%,6px);transition:opacity .18s,transform .18s,visibility .18s}
.nav-more:hover .more-panel,.nav-more:focus-within .more-panel,.nav-more.is-open .more-panel{opacity:1;visibility:visible;transform:translate(-50%,0)}
.more-group{min-width:0}
.more-h{margin:4px 10px 6px;font-size:11.5px;color:var(--faint);letter-spacing:.04em}
.more-panel a{display:block;min-height:44px;padding:7px 10px;border-radius:8px;font-size:14px;line-height:1.4;white-space:normal}
.more-panel a small{display:block;margin-top:2px;font-size:12px;color:var(--muted)}
.more-panel a:hover{background:var(--panel-3)}
.head-tools{justify-self:end;display:flex;align-items:center;gap:8px}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:34px;width:auto;padding:0 12px;border:1px solid transparent;border-radius:var(--r-pill);background:none;color:var(--text-2);font-size:14px;white-space:nowrap}
.lang svg{width:15px;height:15px;color:var(--muted)}
.lang:hover{border-color:var(--border);color:var(--accent)}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);width:150px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-float)}
.lang-menu[hidden],.mobile-drawer[hidden],.nav-veil[hidden]{display:none}
.lang-menu a{display:flex;align-items:center;min-height:40px;padding:6px 10px;text-decoration:none;border-radius:var(--r-ui);white-space:nowrap}
.lang-menu a:hover{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:34px;padding:0 18px;border-radius:var(--r-pill);background:var(--ink);color:var(--on-ink);font-size:14px;font-weight:500;text-decoration:none;white-space:nowrap}
.login:hover{background:var(--ink-line);color:var(--on-ink)}
.hamburger{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(--panel);color:var(--text);font-size:19px}
.mobile-drawer{position:absolute;top:100%;right:var(--gutter);left:var(--gutter);z-index:52;max-height:calc(100dvh - 60px);overflow-y:auto;overscroll-behavior:contain;padding:12px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-scroll);box-shadow:var(--shadow-float)}
.mobile-drawer a{display:flex;width:100%;align-items:center;min-height:44px;padding:10px 12px;border-radius:var(--r-ui);text-decoration:none}
.mobile-drawer a:hover,.mobile-drawer a.is-current{background:var(--panel-2);color:var(--accent-dark)}
.drawer-label{margin:12px 12px 4px;color:var(--muted);font-size:12px}
.nav-veil{position:fixed;inset:60px 0 0;z-index:40;background:var(--veil-24)}
/* Shared footer */
.site-footer{padding-top:62px;padding-bottom:28px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.4fr 1fr;gap:36px}
.footer-grid > *{min-width:0}
.footer-brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:600;font-size:18px}
.footer-brand img{width:30px;height:30px}
.footer-intro{max-width:280px;margin-top:16px;color:var(--muted);font-size:14px}
.footer-heading{margin:0 0 12px;font-size:13px;font-weight:600}
.footer-links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;text-decoration:none;color:var(--text-2);font-size:13px}
.footer-links a:hover{color:var(--accent-dark)}
.footer-keywords{display:flex;flex-wrap:wrap;gap:6px}
.footer-keywords a{display:inline-flex;align-items:center;min-height:30px;padding:3px 10px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-pill);font-size:12px;text-decoration:none}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:46px;padding-top:20px;border-top:1px solid var(--border);font-size:12px;color:var(--muted)}
.footer-bottom a{margin-left:16px}
@media(max-width:1100px){.primary-nav a,.more-btn{padding-inline:10px}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:900px){.head-in{grid-template-columns:1fr auto}.primary-nav{display:none}.head-tools{margin-left:auto}.hamburger{display:inline-flex}}
@media(max-width:768px){h1{font-size:clamp(28px,7vw,40px)}.sec{padding-top:56px;padding-bottom:56px}}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .brand-zh{display:none}
  .head-in{gap:4px}
  .head-tools{gap:3px;margin-left:auto}
  .lang{padding-inline:7px}
  .login{padding-inline:12px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}
  .footer-bottom a{margin-left:0;margin-right:12px}
  .tilt,[class*="tilt-"]{transform:none}
  .wrap,main,section,article{max-width:100%;min-width:0}
  .card,.panel{min-width:0}
}
@media(max-width:380px){.lang span{display:none}.brand-en{font-size:15px}.login{padding-inline:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal,.reveal.pending{opacity:1;transform:none;transition:none}}