:root {
  color-scheme: light;
  --bg: #F5F6F1;
  --panel: #FFFFFF;
  --panel-2: #EDEEE8;
  --panel-soft: #F8F8F4;
  --line: #DEDFD8;
  --accent: #CC6A24;
  --accent-hi: #D97C3A;
  --accent-dark: #9A4C17;
  --ink: #22231F;
  --ink-2: #3A3B36;
  --muted: #6B6D66;
  --muted-2: #93958D;
  --ok: #2F8A4E;
  --warn: #B9861A;
  --err: #C2412F;
  --on-accent: #FFFFFF;
  --transparent: transparent;
  --accent-a00: rgba(204,106,36,0);
  --accent-a04: rgba(204,106,36,.04);
  --accent-a06: rgba(204,106,36,.06);
  --accent-a10: rgba(204,106,36,.10);
  --accent-a12: rgba(204,106,36,.12);
  --accent-a28: rgba(204,106,36,.28);
  --accent-a35: rgba(204,106,36,.35);
  --accent-dark-a30: rgba(154,76,23,.30);
  --ink-a04: rgba(34,35,31,.04);
  --ink-a06: rgba(34,35,31,.06);
  --ink-a10: rgba(34,35,31,.10);
  --ink-a14: rgba(34,35,31,.14);
  --ink-a22: rgba(34,35,31,.22);
  --veil: rgba(34,35,31,.35);
  --hi-a28: rgba(255,255,255,.28);
  --hi-a50: rgba(255,255,255,.5);
  --hi-a80: rgba(255,255,255,.8);
  --ok-a12: rgba(47,138,78,.12);
  --warn-a12: rgba(185,134,26,.12);
  --err-a12: rgba(194,65,47,.12);
  --dot-1: #DADBD4;
  --dot-2: #C6C7BF;
  --land-sky-1: #DED5C7;
  --land-sky-2: #D5CBBE;
  --land-mist-1: #C1B8BD;
  --land-mist-2: #ACA3AE;
  --land-mist-3: #9A93A0;
  --land-sea-1: #B3BCBA;
  --land-sea-2: #9BA8A8;
  --land-sea-3: #8B9898;
  --land-shore-1: #8E8869;
  --land-shore-2: #6E6A51;
  --land-glow: rgba(204,106,36,.10);
  --land-glow-0: rgba(204,106,36,0);
  --land-foam: rgba(245,246,241,.38);
  --flag-red: #C8463B;
  --flag-white: #FBFBF8;
  --flag-blue: #33476F;
  --flag-black: #22231F;
  --flag-gold: #DFB140;
  --flag-frame: rgba(34,35,31,.16);
  --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;
  --weight-normal: 400;
  --weight-display: 500;
  --weight-strong: 600;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-body: 16px;
  --text-lede: 17px;
  --text-h3: 22px;
  --text-h2: 32px;
  --text-display: clamp(52px,4.45vw,64px);
  --tracking-display: -.02em;
  --r-xs: 4px;
  --r-sm: 6px;
  --r: 8px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-pill: 999px;
  --r-circle: 50%;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --space-10: 80px;
  --gutter: 32px;
  --content-width: 1344px;
  --reading-width: 820px;
  --head-height: 64px;
  --anchor-offset: 88px;
  --toc-offset: 96px;
  --duration-fast: .2s;
  --duration-reveal: .35s;
  --shadow-win: inset 0 1px 0 var(--hi-a80),0 1px 2px var(--ink-a06),0 30px 80px -14px var(--accent-a12);
  --shadow-cli: inset 0 1px 0 var(--hi-a80),0 2px 6px var(--ink-a10),-22px 20px 44px -14px var(--ink-a22),0 36px 90px -18px var(--accent-a12);
  --shadow-float: 0 1px 2px var(--ink-a10),0 14px 34px -10px var(--accent-a12);
  --shadow-cta: inset 0 1px 0 var(--hi-a28),0 1px 2px var(--accent-dark-a30),0 12px 26px -10px var(--accent-a35);
  --shadow-login: inset 0 1px 0 var(--hi-a28),0 1px 2px var(--ink-a22);
}
*,*::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(--ink);font-family:var(--font-body);font-size:var(--text-body);line-height:1.6;font-weight:var(--weight-normal);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility }
::selection { background:var(--accent-a28) }
[hidden] { display:none !important }
a { color:var(--accent-dark);text-underline-offset:4px }
button,input,select,textarea { font:inherit;color:inherit }
button { cursor:pointer }
button:disabled { cursor:not-allowed }
img,video { display:block;max-width:100%;height:auto }
svg { flex-shrink:0;max-width:100% }
h1,h2,h3,h4 { font-family:var(--font-display);font-weight:var(--weight-display);overflow-wrap:break-word;text-wrap:balance }
h1 { margin:0 0 var(--space-3);font-size:var(--text-display);line-height:1.1;letter-spacing:var(--tracking-display) }
h2 { margin:0 0 var(--space-3);font-size:var(--text-h2);line-height:1.25;letter-spacing:var(--tracking-display) }
h3 { margin:0 0 var(--space-2);font-size:var(--text-h3);line-height:1.4 }
p { margin:0 0 var(--space-2) }
strong,b { font-weight:var(--weight-strong) }
code,kbd,pre { font-family:var(--font-mono) }
code { overflow-wrap:anywhere;font-size:.9em }
pre { max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--panel-2);border:1px solid var(--line);border-radius:var(--r);line-height:1.7 }
pre code { overflow-wrap:normal;white-space:pre }
hr { border:0;border-top:1px solid var(--line);margin-block:var(--space-4) }
:focus-visible { outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--r-sm) }
.sr-only { position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0 }
.no-break { white-space:nowrap }
.sprite { position:absolute;width:0;height:0;overflow:hidden }
.wrap { width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter) }
.reading-wrap { width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter) }
.section { padding-top:var(--space-8);padding-bottom:var(--space-8) }
.stack > * + * { margin-top:var(--space-3) }
.grid { display:grid;gap:var(--space-3);grid-template-columns:repeat(3,minmax(0,1fr)) }
.grid > *, .wrap > *, .reading-wrap > * { min-width:0 }
.panel,.card { min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--shadow-win) }
.card { padding:var(--space-3) }
.panel-inset { padding:var(--space-4);background:var(--panel-2);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hi-a80) }
.muted { color:var(--muted) }
.mono { font-family:var(--font-mono) }
.prose { min-width:0;overflow-wrap:break-word }
.prose h2 { margin-top:var(--space-8) }
.prose h3 { margin-top:var(--space-4) }
.prose p,.prose li { line-height:1.85 }
.prose ul,.prose ol { padding-left:var(--space-3) }
.prose a { overflow-wrap:anywhere }
.prose > :first-child { margin-top:0 }
.btn { display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 22px;border:0;border-radius:var(--r-md);font-size:var(--text-body);font-weight:var(--weight-display);line-height:1.2;text-decoration:none;flex-shrink:0;white-space:nowrap;transition:transform var(--duration-fast) ease,box-shadow var(--duration-fast) ease,background-color var(--duration-fast) ease }
.btn svg { width:16px;height:16px }
.btn-primary { color:var(--on-accent);background:linear-gradient(180deg,var(--accent-hi),var(--accent));box-shadow:var(--shadow-cta) }
.btn-primary:hover,.btn-primary.is-hover { background:linear-gradient(180deg,var(--accent),var(--accent-dark));transform:translateY(-1px) }
.btn-ghost,.btn-secondary { color:var(--ink);background:var(--panel-2);box-shadow:inset 0 0 0 1px var(--line) }
.btn-ghost:hover,.btn-secondary:hover { background:var(--panel);transform:translateY(-1px) }
.btn:active,.btn.is-active { transform:translateY(1px) }
.btn:disabled,.btn[aria-disabled="true"] { color:var(--muted);background:var(--panel-2);box-shadow:inset 0 0 0 1px var(--line);transform:none }
.btn.is-focus { outline:2px solid var(--accent);outline-offset:2px }
.ic-stroke { fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round }
.site-head,#site-header { position:relative;z-index:50 }
.head-in { display:flex;align-items:center;gap:24px;height:var(--head-height);flex-wrap:nowrap }
.brand { display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:var(--weight-strong);font-size:17px;letter-spacing:-.01em;flex:none;min-height:36px }
.brand img { width:26px;height:26px;flex-shrink:0 }
.brand-zh { color:var(--muted);font-weight:var(--weight-normal) }
.desktop-nav { flex:1;min-width:0 }
.tabs { display:flex;align-items:center;justify-content:center;gap:0;list-style:none;margin:0;padding:0;height:var(--head-height) }
.tabs li { min-width:0 }
.tab { position:relative;display:flex;align-items:center;justify-content:center;min-height:44px;height:var(--head-height);padding:0 12px;font-size:var(--text-sm);color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--duration-fast) ease }
.tab::after { content:"";position:absolute;left:12px;right:12px;bottom:13px;height:2px;border-radius:var(--r-xs);background:var(--ink);transform:scaleX(0);transition:transform .25s ease }
.tab:hover { color:var(--ink) }
.tab:hover::after { transform:scaleX(.35) }
.tab.is-current { color:var(--ink);font-weight:var(--weight-display) }
.tab.is-current::after { transform:scaleX(1) }
.head-tools { display:flex;align-items:center;gap:8px;flex-shrink:0;margin-left:auto }
.lang-picker { position:relative }
.lang { display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:0 10px;border:0;border-radius:var(--r);background:var(--transparent);color:var(--muted);font-size:var(--text-sm);text-decoration:none;white-space:nowrap }
.lang:hover { background:var(--ink-a06);color:var(--ink) }
.lang svg { width:15px;height:15px }
.lang-text { white-space:nowrap }
.lang-panel { position:absolute;z-index:80;right:0;top:calc(100% + 8px);width:190px;padding:8px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--shadow-float) }
.lang-panel a { display:flex;align-items:center;min-height:40px;padding:8px 12px;color:var(--ink-2);text-decoration:none;border-radius:var(--r-sm) }
.lang-panel a:hover,.lang-panel a[aria-current] { background:var(--panel-2) }
.login { display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 18px;border-radius:var(--r);background:var(--ink);color:var(--panel);font-size:var(--text-sm);font-weight:var(--weight-display);text-decoration:none;white-space:nowrap;box-shadow:var(--shadow-login) }
.login:hover { background:var(--ink-2) }
.menu-toggle { display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--line);border-radius:var(--r);color:var(--ink);background:var(--panel) }
.menu-line { display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-xs) }
.menu-toggle[aria-expanded="true"] .menu-line:first-child { transform:translateY(6px) rotate(45deg) }
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2) { opacity:0 }
.menu-toggle[aria-expanded="true"] .menu-line:last-child { transform:translateY(-6px) rotate(-45deg) }
.mobile-drawer { position:fixed;z-index:60;top:var(--head-height);right:0;left:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 40px;background:var(--panel);border-top:1px solid var(--line) }
.mobile-drawer a { display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;color:var(--ink-2);text-decoration:none;border-radius:var(--r) }
.mobile-drawer a:hover,.mobile-drawer a.is-current { background:var(--panel-2);color:var(--ink) }
.drawer-languages { margin-top:16px;padding-top:16px;border-top:1px solid var(--line) }
.nav-veil { position:fixed;z-index:55;inset:var(--head-height) 0 0;background:var(--veil);border:0 }
html.nav-open { overflow:hidden }
.site-foot { border-top:1px solid var(--line);background:linear-gradient(180deg,var(--bg),var(--panel-2));padding-top:48px;padding-bottom:24px }
.foot-grid { display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:40px }
.foot-grid > * { min-width:0 }
.foot-intro { margin:16px 0;color:var(--muted);max-width:300px;font-size:var(--text-sm) }
.foot-title { margin:0 0 12px;font-size:var(--text-sm);font-weight:var(--weight-strong) }
.foot-list { list-style:none;margin:0;padding:0 }
.foot-list a { display:inline-flex;align-items:center;min-height:32px;color:var(--ink-2);font-size:var(--text-sm);text-decoration:none }
.foot-list a:hover { color:var(--accent-dark) }
.foot-bottom { display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:40px;padding-top:20px;border-top:1px solid var(--line);font-size:var(--text-xs);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(--ink-2) }
.reveal { transition:opacity var(--duration-reveal) ease,transform var(--duration-reveal) ease }
.reveal.pending { opacity:0;transform:translateY(16px) }
.reveal.shown { opacity:1;transform:none }
#server-status { display:block;position:relative;max-width:100%;min-width:0;overflow:hidden;margin-block:24px }
#server-status > * { min-width:0;max-width:100% }
#server-status + * { margin-top:24px }
.decorative-section { position:relative;overflow-x:clip;max-width:100% }
@media (max-width:1200px) {
  .head-in { gap:16px }
  .tab { padding-inline:9px }
  .tab::after { left:9px;right:9px }
}
@media (min-width:961px) {
  html[lang="en"] .tabs,html[lang="ja"] .tabs,html[lang="ko"] .tabs { justify-content:flex-start;gap:8px;overflow-x:auto;scrollbar-width:thin }
}
@media (max-width:960px) {
  .desktop-nav { display:none }
  .head-tools { margin-left:auto }
  .menu-toggle { display:inline-flex }
}
@media (max-width:768px) {
  :root { --gutter:20px;--text-display:40px;--text-h2:28px }
  h1 { line-height:1.15 }
  .grid { grid-template-columns:minmax(0,1fr) }
  .foot-grid { grid-template-columns:repeat(2,minmax(0,1fr));gap:32px }
  .panel-inset { padding:24px }
}
@media (max-width:640px) {
  .no-break { white-space:normal }
  .tilt,.decorative-tilt { transform:none }
  .decorative-section { max-width:100%;overflow-x:clip }
  .head-in { gap:8px }
  .head-tools { gap:4px;margin-left:auto }
  .lang-text { display:none }
  .lang { padding-inline:8px }
  .brand { font-size:16px;gap:7px }
  .login { padding-inline:12px }
}
@media (max-width:360px) {
  :root { --gutter:16px;--text-display:34px }
  .brand img { width:24px;height:24px }
  .brand { font-size:15px }
  .head-tools { gap:2px }
  .login { padding-inline:10px }
  .foot-grid { grid-template-columns:minmax(0,1fr) }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto }
  *,*::before,*::after { transition:none !important;animation:none !important }
  .reveal,.reveal.pending { opacity:1;transform:none }
}