:root {
  --bg:#E7ECF3;
  --bg-hero-top:#EEF2F8;
  --bg-hero-bottom:#E2E8F0;
  --panel:#F6F8FC;
  --panel-shade:#ECF0F6;
  --groove:#DAE2EC;
  --border:#CBD5E2;
  --border-soft:#DFE5EE;
  --accent:#C9453B;
  --accent-2:#D9604F;
  --accent-dark:#9F3129;
  --text:#1A2230;
  --muted:#5B6678;
  --faint:#7C889B;
  --cobalt:#3F6FD8;
  --pine:#2E8B62;
  --success:var(--pine);
  --warn:#B7791F;
  --error:#B83232;
  --on-accent:#FFFFFF;
  --ink-bar:#1C2533;
  --on-dark:#E7ECF3;
  --on-dark-muted:#A9B4C6;
  --device:#1E2430;
  --device-hi:#2A3241;
  --device-cam:#3A4354;
  --device-base-top:#2C3443;
  --device-base-bot:#151A23;
  --wall-a:#2B3A55;
  --wall-b:#1E2738;
  --flag-red:var(--accent);
  --flag-white:var(--panel);
  --flag-navy:var(--wall-a);
  --flag-edge:rgba(26,34,48,.16);
  --accent-a04:rgba(201,69,59,.045);
  --accent-a10:rgba(201,69,59,.10);
  --accent-a12:rgba(201,69,59,.12);
  --accent-a14:rgba(201,69,59,.14);
  --cobalt-a12:rgba(63,111,216,.12);
  --pine-a12:rgba(46,139,98,.14);
  --cool-white-a:rgba(246,248,252,.38);
  --chip-bg:rgba(246,248,252,.66);
  --chip-ring:rgba(203,213,226,.62);
  --hl-edge:rgba(255,255,255,.92);
  --hl-dark:rgba(255,255,255,.14);
  --hl-dark-soft:rgba(255,255,255,.05);
  --wall-light:rgba(246,248,252,.13);
  --dock-glass:rgba(246,248,252,.8);
  --notch:rgba(6,9,14,.42);
  --shade-ink:rgba(26,34,48,.09);
  --underline-dark:rgba(26,34,48,.34);
  --underline-light:rgba(231,236,243,.5);
  --veil:rgba(26,34,48,.45);
  --shadow-panel:0 24px 60px -20px var(--accent-a10),0 2px 6px rgba(26,34,48,.06);
  --shadow-rig:0 34px 110px -12px var(--accent-a12),0 26px 50px -26px rgba(16,22,34,.5);
  --shadow-app:0 30px 60px -18px rgba(5,10,20,.58),0 0 0 1px rgba(255,255,255,.5);
  --shadow-float:0 32px 64px -16px rgba(22,30,44,.38),0 12px 28px -10px var(--accent-a14),0 0 0 1px rgba(203,213,226,.55);
  --shadow-dock:0 18px 32px -10px rgba(5,10,20,.55),inset 0 1px 0 var(--hl-edge);
  --shadow-cta:0 14px 30px -8px var(--accent-a14),0 4px 10px var(--accent-a14),inset 0 1px 0 rgba(255,255,255,.24);
  --shadow-login:0 6px 14px -6px rgba(26,34,48,.45),inset 0 1px 0 var(--hl-dark);
  --shadow-base:inset 0 1px 0 var(--hl-dark),0 18px 30px -14px rgba(16,22,34,.45);
  --shadow-switch:inset 0 1px 2px rgba(0,0,0,.18);
  --shadow-knob:0 1px 2px rgba(0,0,0,.25);
  --shadow-tile:inset 0 0 0 1px var(--chip-ring),0 2px 4px rgba(26,34,48,.08);
  --r-xs:5px;
  --r-sm:6px;
  --r-md:8px;
  --r-lg:12px;
  --r-xl:18px;
  --r-screen:9px;
  --r-window:10px;
  --r-pill:999px;
  --r-point:1.5px;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --size-body:16px;
  --size-small:14px;
  --size-display:64px;
  --size-h2:36px;
  --size-h3:22px;
  --weight-body:400;
  --weight-medium:500;
  --weight-semi:650;
  --weight-bold:700;
  --weight-display:800;
  --gutter:32px;
  --content-width:1264px;
  --reading-width:820px;
  --section-space:80px;
  --header-height:96px;
  --anchor-offset:112px;
  --toc-offset:16px;
  --toc-landing:92px;
  --ease-ui:cubic-bezier(.2,.65,.3,1);
  --time-ui:.15s;
  --time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled,.btn-primary[aria-disabled="true"]{cursor:not-allowed;filter:grayscale(1);opacity:.6}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:clamp(52px,5vw,68px);font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--size-h2);font-weight:var(--weight-display);line-height:1.25;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:var(--size-h3);line-height:1.35;margin:0 0 16px}
p{margin:0 0 20px}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--ink-bar);color:var(--on-dark);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--border);word-break:keep-all}
th{color:var(--text);font-weight:var(--weight-semi)}
.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(--section-space);padding-bottom:var(--section-space)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-lg);box-shadow:var(--shadow-panel),inset 0 1px 0 var(--hl-edge);padding:32px}
.muted{color:var(--muted)}
.kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.no-break{white-space:nowrap}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.prose{min-width:0;line-height:1.85}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose ul{list-style:disc;padding-left:24px;margin-bottom:24px}
.prose ol{padding-left:24px;margin-bottom:24px}
.prose li{margin-bottom:8px}
.prose a{overflow-wrap:anywhere}
.prose section{min-width:0}
.btn-primary,.btn-secondary,.login{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;flex-shrink:0;white-space:nowrap}
.btn-primary{gap:9px;min-height:48px;padding:10px 24px;border:0;border-radius:var(--r-md);background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--on-accent);font-size:16px;font-weight:var(--weight-semi);letter-spacing:.01em;box-shadow:var(--shadow-cta);transition:transform var(--time-ui)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-primary:active{transform:translateY(1px)}
.btn-primary svg{width:16px;height:16px}
.btn-secondary{min-height:44px;padding:10px 20px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);font-weight:var(--weight-semi)}
.btn-secondary:hover{background:var(--groove)}
.btn-text{display:inline-flex;align-items:center;gap:6px;min-height:24px;font-size:16px;font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:6px;text-decoration-color:var(--underline-dark)}
.btn-text:hover{color:var(--accent-dark);text-decoration-color:currentColor}
.cta-row{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:26px;margin-top:24px}
.notice{background:var(--ink-bar);color:var(--on-dark);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase}
.notice .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:34px}
.notice-msg{display:flex;align-items:center;gap:10px;margin:0}
.notice-star{width:14px;height:14px;color:var(--accent-2);flex:none}
.notice-link{display:inline-flex;align-items:center;min-height:24px;color:var(--on-dark);text-decoration:underline;text-decoration-color:var(--underline-light);white-space:nowrap}
.notice-link:hover{text-decoration-color:var(--on-dark)}
#site-header{position:relative;z-index:60}
.masthead{background:var(--panel);border-bottom:1px solid var(--border-soft);position:relative;z-index:43}
.masthead>.wrap{display:flex;align-items:center;flex-wrap:nowrap;gap:24px;height:62px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:none}
.brand-mark{width:28px;height:28px;display:block;filter:drop-shadow(0 4px 8px var(--accent-a14))}
.brand-name{font-family:var(--font-display);font-weight:var(--weight-display);font-size:18px;letter-spacing:-.02em}
.nav-main{flex:1;min-width:0}
.nav-main>ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-link{position:relative;display:inline-flex;align-items:center;gap:5px;padding:8px 13px;min-height:38px;border:0;background:none;cursor:pointer;border-radius:var(--r-sm);font-size:14.5px;font-weight:var(--weight-medium);color:var(--text);text-decoration:none;white-space:nowrap;transition:background-color var(--time-ui)}
.nav-link:hover,.nav-link:focus-visible{background:var(--panel-shade)}
.nav-link[aria-current="page"]{font-weight:var(--weight-semi)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:13px;right:13px;bottom:3px;height:2px;border-radius:var(--r-point);background:var(--text)}
.nav-link svg{width:12px;height:12px;color:var(--faint)}
.nav-more{position:relative}
.nav-more>summary{list-style:none}
.nav-more>summary::-webkit-details-marker{display:none}
.nav-more:not([open])>.nav-menu{display:none}
.nav-menu{position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);width:384px;padding:14px;display:grid;grid-template-columns:1fr 1fr;gap:6px 14px;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-lg);box-shadow:var(--shadow-panel);z-index:45}
.menu-col{display:flex;flex-direction:column;gap:2px;min-width:0}
.menu-group-title{margin:0 0 2px;padding:0 10px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.menu-item{display:block;padding:8px 10px;border-radius:var(--r-md);text-decoration:none}
.menu-item:hover,.menu-item:focus-visible{background:var(--panel-shade)}
.menu-item[aria-current="page"]{background:var(--groove)}
.menu-item b{display:block;font-size:14px;font-weight:600}
.menu-item span{display:block;font-size:12px;color:var(--muted);margin-top:1px}
.mast-tools{display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;min-width:44px;width:auto;padding:7px 10px;border:0;background:none;cursor:pointer;border-radius:var(--r-sm);font-size:13.5px;color:var(--muted)}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel-shade)}
.lang svg{width:15px;height:15px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:46;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 12px;text-decoration:none;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--groove)}
.login{height:38px;padding:0 18px;border-radius:var(--r-md);background:var(--text);color:var(--panel);font-size:14px;font-weight:600;box-shadow:var(--shadow-login);transition:transform var(--time-ui)}
.login:hover{transform:translateY(-1px)}
.nav-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(--border);border-radius:var(--r-md);background:var(--panel)}
.nav-toggle-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-point)}
.nav-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel-shade);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.2fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-intro{margin-top:20px;color:var(--muted);max-width:360px;font-size:14px;line-height:1.8}
.footer-title{font-size:14px;margin:0 0 16px;font-weight:var(--weight-bold)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--muted);text-decoration:none}
.footer-links a:hover{color:var(--text);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--muted)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;color:var(--muted);font-size:13px}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.reveal{transition:opacity var(--time-reveal) var(--ease-ui),transform var(--time-reveal) var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-block:32px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}
@media(max-width:1080px){
  .nav-main .nav-link{padding:8px 9px}
  .masthead>.wrap{gap:16px}
}
@media(max-width:960px){
  .nav-main{display:none}
  .mast-tools{margin-left:auto}
  .nav-toggle{display:flex}
  .nav-drawer{position:fixed;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--panel);z-index:42;border-top:1px solid var(--border)}
  .nav-drawer:not([hidden]){display:block}
  .nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--r-md)}
  .nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--groove)}
  .drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
  .nav-veil:not([hidden]){display:block;position:fixed;inset:var(--header-height) 0 0;border:0;background:var(--veil);z-index:41}
  .footer-grid{gap:24px}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  h2{font-size:28px}
  :root{--section-space:56px;--gutter:24px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  [data-hero-visual],.decoration-host{max-width:100%;overflow-x:clip}
  .masthead>.wrap{gap:8px}
  .mast-tools{gap:4px;margin-left:auto}
  .brand{gap:6px}
  .brand-name{font-size:16px}
  .brand-mark{width:24px;height:24px}
  .lang{padding:7px 4px;font-size:11px;gap:4px}
  .lang svg{display:none}
  .login{padding-inline:12px;font-size:13px}
  .notice .wrap{gap:8px}
  .notice{font-size:10px;letter-spacing:0}
  .notice-star{width:12px;height:12px}
  .notice-msg{gap:6px}
  .panel,.card{padding:24px}
  .cta-row{gap:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}