:root{
  --color-page:#F6FBF8;
  --color-surface:#FFFFFF;
  --color-forest:#0D231C;
  --color-border:#D9E7DF;
  --color-accent:#00B884;
  --color-accent-deep:#007A58;
  --color-ink:#12241C;
  --color-muted:#5A7265;
  --color-success:#1E9E5A;
  --color-warning:#D99A2B;
  --color-error:#D6544A;
  --color-mark:#C7F0DF;
  --color-dark-text:#EAF5EF;
  --color-dark-muted:#93B3A4;
  --color-focus:#00B884;
  --color-overlay:rgba(13,35,28,.46);
  --color-shadow:rgba(13,35,28,.22);
  --color-shadow-strong:rgba(13,35,28,.4);
  --color-accent-shadow:rgba(0,184,132,.55);
  --color-dark-line:rgba(217,231,223,.12);
  --color-grid:rgba(217,231,223,.045);
  --color-accent-line:rgba(0,184,132,.32);
  --color-flag-line:rgba(18,36,28,.14);
  --color-switch-shadow:rgba(0,0,0,.28);
  --color-switch-knob:rgba(0,0,0,.35);
  --font-display:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SF Mono',Consolas,'Courier New',monospace;
  --radius-small:8px;
  --radius-medium:14px;
  --radius-large:20px;
  --radius-pill:999px;
  --shadow-card:0 30px 60px -24px var(--color-shadow-strong),0 8px 22px -8px var(--color-shadow);
  --shadow-chip:0 10px 24px -10px var(--color-shadow),0 2px 6px var(--color-shadow);
  --content-width:1240px;
  --reading-width:780px;
  --header-height:64px;
  --gutter:40px;
  --section-space:96px;
  --toc-offset:82px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;background:var(--color-page)}
html.nav-open{overflow:hidden}
body{margin:0;min-width:320px;background:var(--color-page);color:var(--color-ink);font-family:var(--font-body);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:clip}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit}
button{color:inherit}
a{color:inherit;text-decoration:none}
p,h1,h2,h3,h4,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0}
li{min-width:0}
table{border-collapse:collapse}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
::selection{background:var(--color-mark);color:var(--color-ink)}
:focus-visible{outline:2px solid var(--color-focus);outline-offset:3px}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space);overflow-x:clip}
.section-head{display:grid;gap:14px;max-width:760px;margin-bottom:38px}
.eyebrow{font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--color-accent-deep)}
h1,h2,h3{font-family:var(--font-display);font-weight:900;line-height:1.14;text-wrap:balance}
h1,.hero-title{font-size:clamp(52px,5.3vw,72px);letter-spacing:-.02em}
h2{font-size:clamp(34px,4vw,52px);letter-spacing:-.018em}
h3{font-size:clamp(22px,2.4vw,30px);letter-spacing:-.01em}
.lead{font-size:clamp(18px,2vw,22px);line-height:1.55;color:var(--color-muted)}
.muted{color:var(--color-muted)}
.mono{font-family:var(--font-mono)}
.mark{padding-inline:.04em;background:linear-gradient(0deg,var(--color-mark),var(--color-mark)) no-repeat 0 82%/100% 44%}
.stack{display:grid;gap:20px}
.cluster{display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.card,.panel{min-width:0;border:1px solid var(--color-border);border-radius:var(--radius-medium);background:var(--color-surface)}
.card{padding:26px}
.panel{padding:32px}
.dark-panel{color:var(--color-dark-text);background-color:var(--color-forest);background-image:linear-gradient(var(--color-grid) 1px,transparent 1px),linear-gradient(90deg,var(--color-grid) 1px,transparent 1px);background-size:26px 26px}
.badge,.tag,.fact-pill{display:inline-flex;align-items:center;gap:8px;min-height:28px;max-width:100%;padding:4px 11px;border:1px solid var(--color-border);border-radius:var(--radius-pill);background:var(--color-surface);font-size:13px;font-weight:700;overflow:hidden}
.badge-dot{width:7px;height:7px;border-radius:50%;background:var(--color-accent);flex-shrink:0}
.btn{display:inline-flex;align-items:center;justify-content:center;min-width:24px;min-height:44px;padding:0 24px;border:1.5px solid transparent;border-radius:var(--radius-small);font-weight:700;line-height:1;cursor:pointer;transition:background-color .2s,color .2s,border-color .2s,transform .2s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{height:50px;padding-inline:34px;color:var(--color-surface);background:var(--color-accent);box-shadow:0 10px 22px -10px var(--color-accent-shadow)}
.btn-primary:hover{background:var(--color-accent-deep)}
.btn-secondary{height:50px;padding-inline:30px;color:var(--color-ink);background:var(--color-surface);border-color:var(--color-border)}
.btn-secondary:hover{color:var(--color-accent-deep);border-color:var(--color-accent-deep)}
.btn-dark{color:var(--color-dark-text);background:var(--color-forest);border-color:var(--color-forest)}
.btn-small{min-height:38px;padding-inline:18px;font-size:14px}
.reveal{transition:opacity .65s ease,transform .65s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}

/* Shared header */
.site-head{position:relative;z-index:50;border-bottom:1px solid var(--color-border);background:var(--color-page)}
.head-inner{display:flex;align-items:center;min-height:var(--header-height);gap:28px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-height:44px}
.brand-logo{width:30px;height:30px;flex-shrink:0}
.brand-name{font-family:var(--font-display);font-size:19px;font-weight:900;letter-spacing:-.01em}
.brand-local{font-size:13px;font-weight:600;color:var(--color-muted)}
.main-nav{display:flex;align-self:stretch;gap:2px}
.main-nav a{position:relative;display:flex;align-items:center;padding-inline:12px;color:var(--color-muted);font-size:14px;font-weight:600;white-space:nowrap}
.main-nav a:hover,.main-nav a[aria-current="page"]{color:var(--color-ink)}
.main-nav a[aria-current="page"]{font-weight:800}
.main-nav a[aria-current="page"]::after{content:"";position:absolute;right:11px;bottom:-1px;left:11px;height:3px;border-radius:2px 2px 0 0;background:var(--color-accent)}
.head-tools{display:flex;align-items:center;gap:10px;margin-left:auto}
.lang-wrap{position:relative}
.lang-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 8px;border:0;background:transparent;color:var(--color-muted);cursor:pointer}
.lang-menu{position:absolute;top:calc(100% + 8px);right:0;z-index:60;display:none;width:166px;padding:7px;border:1px solid var(--color-border);border-radius:var(--radius-small);background:var(--color-surface);box-shadow:var(--shadow-chip)}
.lang-wrap.open .lang-menu{display:grid}
.lang-menu a{display:flex;align-items:center;min-height:42px;padding:8px 10px;border-radius:var(--radius-small);font-size:14px}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--color-page);color:var(--color-accent-deep)}
.login-button{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding-inline:20px;border:1.5px solid var(--color-ink);border-radius:var(--radius-small);background:var(--color-surface);font-size:14px;font-weight:800}
.login-button:hover{color:var(--color-surface);background:var(--color-ink)}
.menu-button{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0;border:0;background:transparent;cursor:pointer}
.menu-lines,.menu-lines::before,.menu-lines::after{display:block;width:22px;height:2px;background:var(--color-ink)}
.menu-lines{position:relative}
.menu-lines::before,.menu-lines::after{content:"";position:absolute;left:0}
.menu-lines::before{top:-7px}.menu-lines::after{top:7px}
.mobile-nav{display:none}
.nav-veil{display:none}

/* Shared footer */
.site-footer{padding-top:72px;padding-bottom:28px;color:var(--color-dark-text);background-color:var(--color-forest);background-image:linear-gradient(var(--color-grid) 1px,transparent 1px),linear-gradient(90deg,var(--color-grid) 1px,transparent 1px);background-size:26px 26px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1.2fr;gap:56px}
.footer-brand{display:grid;align-content:start;gap:14px}
.footer-brandline{display:flex;align-items:center;gap:10px}
.footer-brandline img{width:32px;height:32px}
.footer-brandline strong{font-family:var(--font-display);font-size:20px}
.footer-brand p{max-width:390px;color:var(--color-dark-muted)}
.footer-col h2{margin-bottom:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--color-accent)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-lang a{display:inline-flex;align-items:center;min-height:32px;color:var(--color-dark-muted);font-size:14px}
.footer-links a:hover,.footer-lang a:hover{color:var(--color-dark-text)}
.footer-lang{display:flex;flex-wrap:wrap;gap:4px 16px;margin-top:22px}
.footer-bottom{display:flex;justify-content:space-between;gap:24px;margin-top:48px;padding-top:22px;border-top:1px solid var(--color-dark-line);color:var(--color-dark-muted);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}

[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums}
.ticker{max-width:100%;overflow:hidden;border-block:1px solid var(--color-border);background:var(--color-surface)}
.ticker-track{display:flex;width:max-content;will-change:transform}
.ticker-group{display:flex;align-items:center;gap:30px;padding:14px 15px}
.ticker-item{display:flex;align-items:center;gap:10px;white-space:nowrap;color:var(--color-muted);font-family:var(--font-mono);font-size:13px}
.ticker-item::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--color-accent);flex-shrink:0}

body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}

@media (max-width:1100px){
  :root{--gutter:28px}
  .main-nav{display:none}
  .menu-button{display:flex}
  .head-tools{margin-left:auto}
  .mobile-nav{position:absolute;top:100%;right:0;left:0;z-index:70;max-height:calc(100dvh - var(--header-height));padding:10px var(--gutter) 18px;overflow-y:auto;overscroll-behavior:contain;border-bottom:1px solid var(--color-border);background:var(--color-surface)}
  .mobile-nav.open{display:block}
  .mobile-nav ul{display:grid;list-style:none}
  .mobile-nav a{display:flex;align-items:center;width:100%;min-height:48px;padding:10px 8px;border-bottom:1px solid var(--color-border);font-weight:700}
  .mobile-nav a[aria-current="page"]{color:var(--color-accent-deep)}
  .mobile-languages{margin-top:10px}
  .mobile-languages a{font-weight:500;color:var(--color-muted)}
  .nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:40;background:var(--color-overlay)}
  .nav-veil.open{display:block}
}
@media (max-width:768px){
  :root{--gutter:20px;--section-space:72px}
  h1,.hero-title{font-size:clamp(28px,9.8vw,40px);line-height:1.12;letter-spacing:-.018em}
  h2{font-size:clamp(28px,8vw,38px)}
  .footer-grid{grid-template-columns:1fr;gap:36px}
  .footer-bottom{flex-direction:column}
}
@media (max-width:640px){
  :root{--gutter:16px;--header-height:60px}
  body{overflow-x:clip}
  .no-break{white-space:normal}
  .ticker{overflow:visible}
  .ticker-track{width:100%;transform:none!important}
  .ticker-group{width:100%;flex-wrap:wrap;justify-content:center;gap:12px 22px}
  .ticker-group + .ticker-group{display:none}
  .wrap,.reading{padding-inline:var(--gutter)}
  .brand-local,.desktop-language{display:none}
  .head-inner{min-height:var(--header-height);gap:8px}
  .login-button{min-width:60px;padding-inline:12px}
  .card,.panel{padding:20px}
  .tilt,.decorative-tilt{transform:none!important}
  .footer-links{grid-template-columns:1fr 1fr}
  .absolute-decor,.hero-orb,.watermark{display:none!important}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1!important;transform:none!important}
}