:root{
--bg:#E8EBF7;--bg-panel:#F7F8FD;--bg-panel2:#DCE1F2;--border:#CDD3EA;--accent:#4B32C3;--accent-dark:#3622A0;--accent-2:#7A6BFF;--text:#12142A;--text-muted:#565C78;--success:#1E9E6A;--warn:#C98A12;--error:#D23A4A;--white:#FFFFFF;--clear:transparent;
--atmo-top:#F1F3FB;--atmo-bottom:#E3E7F5;--accent-tint:#E4E0FB;--tray-a:rgba(75,50,195,.11);--tray-b:rgba(75,50,195,.06);--accent-wash:rgba(75,50,195,.07);--accent-soft:rgba(75,50,195,.16);--hl:rgba(255,255,255,.92);--hl-soft:rgba(255,255,255,.58);--hl-onaccent:rgba(255,255,255,.26);--on-accent-fill:rgba(255,255,255,.14);--on-accent-ring:rgba(255,255,255,.36);--success-soft:rgba(30,158,106,.18);--warn-soft:rgba(201,138,18,.20);--muted-soft:rgba(86,92,120,.18);--ink-shadow:rgba(18,20,42,.14);--veil-fill:rgba(18,20,42,.28);
--shadow-xs:0 1px 2px rgba(75,50,195,.08);--shadow-card:0 18px 40px -16px rgba(75,50,195,.12),0 2px 6px rgba(75,50,195,.06);--shadow-window:0 40px 80px -24px rgba(75,50,195,.14),0 14px 30px -14px rgba(75,50,195,.12);--shadow-float:0 26px 50px -14px rgba(75,50,195,.14),0 4px 10px rgba(75,50,195,.08);--shadow-btn:0 14px 26px -12px rgba(75,50,195,.55);--shadow-picked:0 12px 24px -12px rgba(75,50,195,.40);--shadow-board:0 40px 90px -30px rgba(75,50,195,.10),0 2px 8px rgba(75,50,195,.04);--groove-inset:inset 0 1px 3px rgba(18,20,42,.07);--hand-shadow:drop-shadow(0 2px 3px rgba(18,20,42,.22));
--flag-red:#D3293B;--flag-navy:#26357F;--flag-black:#1C1C22;--flag-gold:#F1BD1B;--flag-edge:rgba(18,20,42,.16);
--radius-xxs:4px;--radius-xs:6px;--radius-sm:8px;--radius-rule:10px;--radius-md:12px;--radius-lg:20px;--radius-pill:999px;--radius-round:50%;
--font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;--font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;--font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
--gutter:clamp(20px,5vw,72px);--wrap-max:1440px;--header-height:76px;--anchor-offset:96px;--toc-offset:156px;--ease: ease;--fast:.2s;--reveal-time:.35s;
}
*,*::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(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
html.nav-open{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,summary{touch-action:manipulation}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--radius-xs)}
[hidden]{display:none!important}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:clamp(52px,4.72vw,68px);font-weight:900;line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);font-weight:900;line-height:1.2;letter-spacing:-.02em}
h3{font-size:20px;line-height:1.35}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel2);border-radius:var(--radius-sm)}
pre code{overflow-wrap:normal}
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.reading-wrap{max-width:880px;margin-inline:auto}
:where(.hero-grid,.grid,.plans-grid,.platform-grid,.article-grid,.footer-grid)>*{min-width:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.panel,.card{background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-card),inset 0 1px 0 var(--hl);padding:28px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 26px;border:1px solid var(--clear);border-radius:var(--radius-sm);font-family:var(--font-body);font-size:16px;font-weight:650;letter-spacing:.01em;line-height:1.4;white-space:nowrap;flex-shrink:0;transition:transform var(--fast) var(--ease),background var(--fast) var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:16px;height:16px}
.btn-primary{color:var(--white);background:linear-gradient(135deg,var(--accent) 0%,var(--accent) 58%,var(--accent-2) 150%);box-shadow:inset 0 1px 0 var(--hl-onaccent),var(--shadow-btn)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--white);border-color:var(--text)}
.btn:active,.btn.is-active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.shell{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,var(--atmo-top) 0%,var(--atmo-bottom) 100%)}
#site-header{position:relative;z-index:30;min-height:var(--header-height)}
.topbar{position:relative;z-index:35}
.topbar-in{display:flex;align-items:center;gap:28px;height:var(--header-height);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand img{width:34px;height:34px;flex:none}
.brand-word{font-family:var(--font-display);font-size:20px;font-weight:800;letter-spacing:-.02em;color:var(--text)}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav-track{display:flex;align-items:center;gap:2px;margin:0;padding:4px;list-style:none;background:var(--bg-panel2);border-radius:var(--radius-pill);box-shadow:var(--groove-inset)}
.nav-track a{display:flex;align-items:center;justify-content:center;padding:7px 15px;min-height:36px;border-radius:var(--radius-pill);font-size:14.5px;font-weight:550;color:var(--text-muted);white-space:nowrap}
.nav-track a:hover{color:var(--text)}
.nav-track a[aria-current="page"]{background:var(--white);color:var(--text);font-weight:650;box-shadow:var(--shadow-xs),inset 0 1px 0 var(--hl)}
.top-right{display:flex;align-items:center;gap:10px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:38px;padding:0 12px;border:0;background:var(--clear);font-size:14px;font-weight:550;color:var(--text-muted);border-radius:var(--radius-sm)}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:50;min-width:176px;padding:8px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--radius-xs)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--bg-panel2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--radius-sm);background:var(--accent);color:var(--white);font-size:14.5px;font-weight:650;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl-onaccent),var(--shadow-xs)}
.login:hover{background:var(--accent-dark)}
.burger{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(--radius-sm);background:var(--white);color:var(--text)}
.burger-line{display:block;width:20px;height:2px;background:currentColor}
.drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:33;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:20px var(--gutter)}
.drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--radius-sm)}
.drawer a[aria-current="page"]{background:var(--accent-tint);color:var(--accent)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.veil{position:fixed;inset:var(--header-height) 0 0;z-index:31;border:0;background:var(--veil-fill)}
.site-footer{padding-top:56px;padding-bottom:24px;background:var(--bg-panel2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.footer-intro{max-width:30em;color:var(--text-muted);font-size:14px}
.footer-title{margin:0 0 12px;font-size:15px;font-weight:750}
.footer-links{display:grid;align-content:start;gap:4px}
.footer-links a{display:flex;align-items:center;min-height:32px;font-size:14px;color:var(--text-muted)}
.footer-links a:hover,.footer-legal a:hover{color:var(--accent)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:36px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;width:100%;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.prose{line-height:1.85;min-width:0}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
@media(max-width:1240px){.nav-track a{padding-inline:12px}.topbar-in{gap:20px}}
@media(max-width:1120px){
.nav{display:none}.top-right{margin-left:auto}.burger{display:flex}
}
@media(min-width:1121px){.drawer,.veil{display:none!important}}
@media(max-width:768px){
h1{font-size:clamp(28px,7vw,40px)}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.section{padding-top:40px;padding-bottom:40px}
}
@media(max-width:640px){
.no-break{white-space:normal}.tilt,.decor-tilt{transform:none}
:where(.shell,.stage,.decoration){max-width:100%;overflow-x:clip}
.topbar-in{gap:8px}.top-right{gap:4px;margin-left:auto}.brand{gap:6px}.brand-word{font-size:17px}.brand img{width:28px;height:28px}.login{padding-inline:12px;font-size:13px}.lang{padding-inline:8px}.lang span{display:none}
.footer-grid{grid-template-columns:minmax(0,1fr)}.panel,.card{padding:20px}
}
@media(prefers-reduced-motion:reduce){
html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.reveal,.reveal.pending{opacity:1;transform:none}
}