:root{
  --color-bg:#F7F4F1;
  --color-panel:#FFFFFF;
  --color-panel-muted:#EFEBE6;
  --color-border:#E3DED8;
  --color-border-strong:#CFC8C0;
  --color-accent:#8F6BD8;
  --color-accent-dark:#6A48B0;
  --color-accent-soft:#EFE9F9;
  --color-text:#211D26;
  --color-text-muted:#6E6876;
  --color-success:#3E9B6C;
  --color-success-soft:#E5F1EA;
  --color-warning:#C98A2E;
  --color-error:#C4504A;
  --color-gradient-blue:#B7CBE9;
  --color-gradient-lilac:#CDB9EC;
  --color-gradient-cream:#F2E4BC;
  --color-gradient-blossom:#F1C6D2;
  --color-flag-red:#D6453D;
  --color-flag-crimson:#C8362E;
  --color-flag-white:#FFFFFF;
  --color-flag-blue:#2E4A8F;
  --color-flag-navy:#25407E;
  --font-display:Georgia,'Times New Roman','Songti SC','Noto Serif SC',SimSun,serif;
  --font-body:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR',-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --radius-small:8px;
  --radius-medium:16px;
  --radius-large:26px;
  --radius-xlarge:34px;
  --radius-pill:999px;
  --shadow-window:0 30px 70px rgba(33,29,38,.10),0 6px 18px rgba(33,29,38,.06);
  --shadow-card:0 18px 46px rgba(33,29,38,.08),0 2px 8px rgba(33,29,38,.04);
  --shadow-pill:0 10px 24px rgba(33,29,38,.22);
  --shadow-menu:0 14px 34px rgba(33,29,38,.10);
  --content-width:1180px;
  --wide-width:1280px;
  --reading-width:780px;
  --header-height:68px;
  --gutter:clamp(16px,4vw,32px);
  --section-space:clamp(72px,10vw,132px);
  --focus-ring:2px solid var(--color-accent-dark);
  --ease-standard:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;background:var(--color-bg)}
html.nav-open{overflow:hidden}
body{margin:0;min-width:320px;overflow-x:clip;background:var(--color-bg);color:var(--color-text);font-family:var(--font-body);font-size:16px;line-height:1.68;text-rendering:optimizeLegibility}
main,section,article,aside,header,footer,nav,div{min-width:0}
img,svg,video{display:block;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
p,ul,ol,blockquote,pre,table{margin-top:0}
p{margin-bottom:1.2em}
ul,ol{padding-left:1.35em}
h1,h2,h3,h4{margin-top:0;color:var(--color-text);text-wrap:balance}
h1,h2{font-family:var(--font-display);font-weight:400}
h1{font-size:clamp(52px,5.2vw,72px);line-height:1.12;letter-spacing:0}
h2{font-size:clamp(36px,4vw,54px);line-height:1.18}
h3{font-size:clamp(21px,2vw,28px);line-height:1.3}
small,.text-muted{color:var(--color-text-muted)}
strong{font-weight:600}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow:auto;padding:20px;border:1px solid var(--color-border);border-radius:var(--radius-medium);background:var(--color-panel-muted);line-height:1.6}
table{border-collapse:collapse}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.wrap-wide{width:100%;max-width:var(--wide-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)}
.section-tight{padding-top:clamp(48px,7vw,84px);padding-bottom:clamp(48px,7vw,84px)}
.section-heading{max-width:820px;margin:0 auto 48px;text-align:center}
.section-heading p{max-width:650px;margin:16px auto 0;color:var(--color-text-muted);font-size:18px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;max-width:100%;padding:5px 15px;border:1px solid var(--color-border);border-radius:var(--radius-pill);background:var(--color-panel);color:var(--color-text-muted);font-size:13px;letter-spacing:.04em}
.eyebrow::before{width:6px;height:6px;flex:0 0 6px;border-radius:50%;background:var(--color-success);content:""}
.badge,.tag{display:inline-flex;align-items:center;min-height:26px;max-width:100%;padding:3px 10px;overflow:hidden;border-radius:var(--radius-pill);background:var(--color-panel-muted);color:var(--color-text-muted);font-size:12px;line-height:1.4}
.badge-accent{background:var(--color-accent-soft);color:var(--color-accent-dark)}
.badge-success{background:var(--color-success-soft);color:var(--color-success)}
.panel,.card{border:1px solid var(--color-border);border-radius:var(--radius-large);background:var(--color-panel)}
.card{padding:clamp(22px,3vw,34px);box-shadow:var(--shadow-card);transition:transform .25s var(--ease-standard),box-shadow .25s var(--ease-standard)}
.card:hover{transform:translateY(-3px)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-width:24px;min-height:48px;padding:11px 28px;border:1px solid transparent;border-radius:var(--radius-pill);font-weight:500;line-height:1.25;text-align:center;transition:background-color .2s var(--ease-standard),border-color .2s var(--ease-standard),color .2s var(--ease-standard),transform .2s var(--ease-standard)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--color-text);color:var(--color-panel)}
.btn-primary:hover{background:var(--color-accent-dark)}
.btn-secondary{border-color:var(--color-border-strong);background:transparent;color:var(--color-text)}
.btn-secondary:hover{border-color:var(--color-text);background:var(--color-panel)}
.btn-soft{background:var(--color-accent-soft);color:var(--color-accent-dark)}
.btn-small{min-height:40px;padding:8px 20px;font-size:14px}
:where(a,button,input,select,textarea,summary,[role="tab"]):focus-visible{outline:var(--focus-ring);outline-offset:3px}
.reveal{transition:opacity .65s var(--ease-standard),transform .65s var(--ease-standard)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.site-head{position:relative;z-index:80}
.head-inner{display:flex;align-items:center;gap:30px;width:100%;max-width:var(--wide-width);height:var(--header-height);margin-inline:auto;padding-inline:var(--gutter)}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-height:44px}
.brand img{width:30px;height:30px}
.brand-name{font-size:19px;font-weight:600;letter-spacing:.02em}
.brand-local{color:var(--color-text-muted);font-size:15px;font-weight:400}
.desktop-nav{display:flex;align-items:center;gap:5px}
.nav-link,.more-trigger{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:7px 13px;border:0;border-radius:var(--radius-pill);background:transparent;color:var(--color-text-muted);font-size:14px}
.nav-link:hover,.more-trigger:hover,.nav-link.is-active,.more-trigger.is-active{background:var(--color-panel-muted);color:var(--color-text)}
.nav-more{position:relative}
.more-menu{position:absolute;top:calc(100% + 8px);left:0;display:none;min-width:174px;padding:8px;border:1px solid var(--color-border);border-radius:var(--radius-medium);background:var(--color-panel);box-shadow:var(--shadow-menu)}
.nav-more:hover .more-menu,.nav-more:focus-within .more-menu{display:block}
.more-menu a{display:flex;align-items:center;min-height:42px;padding:8px 13px;border-radius:var(--radius-small);font-size:14px}
.more-menu a:hover,.more-menu a.is-active{background:var(--color-panel-muted)}
.head-tools{display:flex;align-items:center;gap:10px;margin-left:auto}
.language-picker{position:relative}
.language-trigger{display:flex;align-items:center;min-height:40px;padding:7px 10px;border:0;border-radius:var(--radius-pill);background:transparent;color:var(--color-text-muted);font-size:13px}
.language-menu{position:absolute;top:calc(100% + 8px);right:0;display:none;min-width:156px;padding:8px;border:1px solid var(--color-border);border-radius:var(--radius-medium);background:var(--color-panel);box-shadow:var(--shadow-menu)}
.language-picker.is-open .language-menu{display:block}
.language-menu a{display:flex;align-items:center;min-height:40px;padding:7px 12px;border-radius:var(--radius-small);font-size:13px}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--color-panel-muted)}
.login-button{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:7px 22px;border:1px solid var(--color-border-strong);border-radius:var(--radius-pill);background:var(--color-panel);font-size:14px;font-weight:500}
.login-button:hover{border-color:var(--color-text)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0;border:0;border-radius:50%;background:var(--color-panel-muted)}
.menu-toggle-lines,.menu-toggle-lines::before,.menu-toggle-lines::after{display:block;width:18px;height:2px;border-radius:var(--radius-pill);background:var(--color-text);content:""}
.menu-toggle-lines{position:relative}
.menu-toggle-lines::before{position:absolute;top:-6px}
.menu-toggle-lines::after{position:absolute;top:6px}
.mobile-nav{position:absolute;top:var(--header-height);right:var(--gutter);left:var(--gutter);z-index:84;display:none;max-height:calc(100dvh - var(--header-height) - 12px);padding:10px;overflow-y:auto;overscroll-behavior:contain;border:1px solid var(--color-border);border-radius:var(--radius-large);background:var(--color-panel);box-shadow:var(--shadow-menu)}
.mobile-nav.is-open{display:block}
.mobile-nav a{display:flex;align-items:center;width:100%;min-height:48px;padding:11px 14px;border-radius:var(--radius-small)}
.mobile-nav a:hover,.mobile-nav a.is-active{background:var(--color-panel-muted)}
.mobile-nav-label{padding:12px 14px 5px;color:var(--color-text-muted);font-size:12px;letter-spacing:.08em}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:70;display:none;background:rgba(33,29,38,.16)}
.nav-veil.is-open{display:block}
.site-footer{margin-top:var(--section-space);border-top:1px solid var(--color-border);background:var(--color-panel)}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1.15fr;gap:56px;padding-top:70px;padding-bottom:54px}
.footer-brand p{max-width:390px;margin-top:18px;color:var(--color-text-muted)}
.footer-title{margin-bottom:14px;font-size:13px;font-weight:600;letter-spacing:.08em}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 18px}
.footer-links a,.footer-hot a,.footer-languages a{display:inline-flex;align-items:center;min-height:32px;color:var(--color-text-muted);font-size:14px}
.footer-links a:hover,.footer-hot a:hover,.footer-languages a:hover{color:var(--color-text)}
.footer-hot,.footer-languages{display:flex;flex-wrap:wrap;gap:5px 14px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:22px;padding-bottom:28px;border-top:1px solid var(--color-border);color:var(--color-text-muted);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.prose{font-size:17px}
.prose h2,.prose h3{scroll-margin-top:110px}
.prose h2{margin-top:2.2em;margin-bottom:.65em}
.prose h3{margin-top:1.8em;margin-bottom:.55em}
.prose a:not(.btn){color:var(--color-accent-dark);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose img{border-radius:var(--radius-medium)}
.prose blockquote{margin:24px 0}
.tilt,.tilt-card{transform:rotate(.35deg)}
body:has(.toc-tabs) section[id]{scroll-margin-top:128px}
@media(max-width:900px){
  .desktop-nav{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:flex}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  h1{font-size:clamp(32px,9vw,40px);line-height:1.14}
  h2{font-size:clamp(29px,7vw,38px)}
  .head-inner{gap:12px}
  .brand-local,.language-trigger .language-label{display:none}
  .login-button{padding-inline:16px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  html,body{overflow-x:hidden}
  body{font-size:15px}
  .section{padding-top:72px;padding-bottom:72px}
  .footer-grid{grid-template-columns:1fr;gap:38px}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .tilt,.tilt-card{transform:none}
}
@media(max-width:390px){
  .brand-name{font-size:17px}
  .head-tools{gap:5px}
  .login-button{padding-inline:13px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}