:root{
--bg:#E6EEF5;--bg-top:#EEF4F9;--bg-bottom:#E0E9F2;--panel:#F7FAFD;--panel-2:#D8E4EF;--border:#C9D7E5;
--accent:#0D9E95;--accent-dark:#087068;--text:#13212F;--muted:#556779;--success:#1F9D5C;--warn:#C9800F;--error:#CF4339;
--navy:#0F2A44;--navy-2:#16405F;--lagoon-ink:#0B3B3C;--lime:#D4EE7A;--ink:#13212F;--white:#FFFFFF;--flag-red:#D52B3A;--flag-blue:#24407E;--flag-white:#FFFFFF;
--clear:transparent;--mask-solid:#000;--mask-soft:rgba(0,0,0,.35);
--accent-a08:rgba(13,158,149,.08);--accent-a12:rgba(13,158,149,.12);--accent-a16:rgba(13,158,149,.16);--accent-a28:rgba(13,158,149,.28);--accent-glow:rgba(13,158,149,.26);
--navy-a10:rgba(15,42,68,.10);--navy-a16:rgba(15,42,68,.16);--navy-a30:rgba(15,42,68,.30);--deep-a50:rgba(4,16,28,.50);
--white-a08:rgba(255,255,255,.08);--white-a16:rgba(255,255,255,.16);--white-a60:rgba(255,255,255,.60);--dot-page:rgba(15,42,68,.075);--dot-card:rgba(255,255,255,.085);--success-a40:rgba(31,157,92,.40);
--font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
--font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
--font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
--r-xs:6px;--r-btn:8px;--r-sm:10px;--r-md:12px;--r-status:14px;--r-lg:18px;--r-window:20px;--r-panel:32px;--r-card:36px;--r-pill:999px;--r-circle:50%;--r-line:3px;--r-seg:7px;--r-highlight:9px;--r-flag:4px;--r-pointer:2px;
--shadow-panel:0 22px 48px -26px var(--accent-a28),0 2px 6px -3px var(--navy-a16);
--shadow-card:0 44px 90px -36px var(--accent-a28),0 26px 50px -30px var(--navy-a30);
--shadow-float:0 18px 36px -18px var(--deep-a50),0 0 0 1px var(--white-a60);
--shadow-window:0 0 0 1px var(--white-a60),inset 0 1px 0 var(--white),0 34px 60px -24px var(--deep-a50),0 26px 80px -18px var(--accent-a12);
--gutter:40px;--wrap-width:1360px;--section-space:80px;--heading-size:40px;--display-size:68px;--body-size:16px;--header-edge:116px;--toc-offset:16px;--anchor-offset:100px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:88px;scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--body-size);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,input,select,textarea,summary{touch-action:manipulation}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,var(--display-size));line-height:1.1;letter-spacing:-.02em;font-weight:800}
h2{font-size:var(--heading-size);line-height:1.15;letter-spacing:-.02em;font-weight:800}
h3{font-size:24px;line-height:1.3}
p{margin:0 0 20px}
ul{padding-left:24px}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-md);background:var(--navy);color:var(--panel)}
pre code{overflow-wrap:normal}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space);overflow-x:clip}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.panel{padding:32px;border-radius:var(--r-panel);background:var(--panel);box-shadow:var(--shadow-panel),inset 0 0 0 1px var(--border),inset 0 1px 0 var(--white)}
.grid-two,.grid-three{display:grid;gap:24px}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
:where(.grid-two,.grid-three,.hero-grid)>*{min-width:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 26px;border:0;border-radius:var(--r-btn);font-family:var(--font-body);font-size:16px;font-weight:700;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease;flex-shrink:0;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--accent);color:var(--white);box-shadow:inset 0 1px 0 var(--white-a16),0 14px 28px -14px var(--accent-a28)}
.btn-primary:hover{box-shadow:inset 0 1px 0 var(--white-a16),0 18px 32px -14px var(--accent-a28)}
.btn-dark,.btn-secondary{background:var(--ink);color:var(--white);box-shadow:0 14px 28px -16px var(--navy-a30)}
.btn-light{background:var(--white);color:var(--ink)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.ic{fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.notice{background:var(--navy);color:var(--lime)}
.notice-in{display:flex;align-items:center;justify-content:center;gap:20px;min-height:44px;padding-block:6px}
.notice-text{margin:0;font-size:14px;font-weight:500;letter-spacing:.01em}
.notice-text strong{font-weight:700}
.notice-sep{margin:0 10px;opacity:.55}
.notice-btns{display:flex;gap:8px;flex-shrink:0}
.nbtn{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:0 14px;border-radius:var(--r-xs);font-size:13px;font-weight:700;text-decoration:none;transition:transform .2s}
.nbtn:hover{transform:translateY(-1px)}
.nbtn-accent{background:var(--accent);color:var(--white)}
.nbtn-light{background:var(--white);color:var(--ink)}
#site-header{position:relative;z-index:60}
.mast{background:var(--bg-top);border-bottom:1px solid var(--border);position:relative;z-index:63}
.mast-in{display:flex;align-items:stretch;flex-wrap:nowrap;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:none}
.logo{display:block;width:34px;height:34px}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:21px;letter-spacing:-.025em;line-height:1}
.brand-zh{font-size:14px;font-weight:500;color:var(--muted);padding-left:10px;border-left:1px solid var(--border)}
.tabs{display:flex;align-items:stretch;flex:1;min-width:0}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px;height:100%}
.tabs li{display:flex;height:100%;flex-shrink:0}
.tabs li.lang-box{align-items:center}
.tabs li[hidden]{display:none}
.tabs .lang-panel a{min-height:42px;padding:10px 13px}
.tabs .lang-panel a::after{display:none}
.tabs a{position:relative;display:flex;align-items:center;padding:0 13px;font-size:15px;font-weight:500;color:var(--muted);text-decoration:none;white-space:nowrap;transition:color .2s}
.tabs a::after{content:"";position:absolute;left:13px;right:13px;bottom:-1px;height:3px;border-radius:var(--r-line) var(--r-line) 0 0;background:var(--accent);transform:scaleX(0);transform-origin:center;transition:transform .25s ease}
.tabs a:hover{color:var(--text)}
.tabs a:hover::after{transform:scaleX(.45)}
.tabs a[aria-current="page"]{color:var(--text);font-weight:700}
.tabs a[aria-current="page"]::after{transform:scaleX(1)}
.mast-end{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;width:auto;padding:0 10px;border:0;border-radius:var(--r-btn);background:var(--clear);color:var(--muted);font-size:14px;font-weight:500;white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang-caret{font-size:11px}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:70;min-width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-btn)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 20px;border-radius:var(--r-btn);border:1.5px solid var(--ink);background:var(--panel);color:var(--ink);font-size:14px;font-weight:700;text-decoration:none;white-space:nowrap;transition:background .2s,color .2s}
.btn-login:hover{background:var(--ink);color:var(--white)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;border:0;border-radius:var(--r-btn);color:var(--ink);background:var(--panel-2)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;top:var(--header-edge);right:0;left:0;z-index:62;height:calc(100dvh - var(--header-edge));max-height:calc(100dvh - var(--header-edge));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 40px}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current="page"]{border-left:3px solid var(--accent);background:var(--accent-a08);font-weight:700}
.drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
.menu-veil{position:fixed;inset:var(--header-edge) 0 0;z-index:61;background:var(--deep-a50);border:0}
html.nav-open{overflow:hidden}
.site-footer{padding-top:64px;padding-bottom:32px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{margin-top:20px;max-width:360px;color:var(--muted)}
.footer-heading{margin:0 0 16px;font-size:16px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;text-decoration:none}
.footer-links a:hover,.footer-legal a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:14px;color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.reveal{transition:opacity .35s ease,transform .35s ease}
.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:24px}
#server-status+*{margin-top:24px}
@media(max-width:1360px){
.mast-in{gap:16px}.tabs a{padding-inline:8px;font-size:14px}.tabs a::after{left:8px;right:8px}.mast-end{gap:6px}
}
@media(max-width:1100px){
.tabs{display:none}.menu-toggle{display:inline-flex}.mast-end{margin-left:auto}
.footer-grid{gap:24px}
}
@media(min-width:1101px){.mobile-drawer,.menu-veil{display:none!important}}
@media(max-width:768px){
:root{--gutter:24px;--section-space:56px;--heading-size:32px}
h1{font-size:40px}.grid-three{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
.notice-in{gap:10px;flex-wrap:wrap}.notice-text{font-size:12px}.mast-in{height:64px}
}
@media(max-width:640px){
:root{--gutter:16px;--heading-size:28px}
.no-break{white-space:normal}
h1{font-size:clamp(28px,9vw,40px)}
.grid-two,.footer-grid{grid-template-columns:1fr}
.panel{padding:24px}.brand{gap:7px}.logo{width:28px;height:28px}.brand-en{font-size:18px}
.mast-in{gap:8px}.mast-end{gap:4px;margin-left:auto}.lang{font-size:12px;padding-inline:5px}.btn-login{padding-inline:12px;font-size:13px}
.notice-in{padding-block:8px;gap:6px}.notice-text{width:100%;text-align:center}.notice-sep{margin-inline:5px}
.tilt,[data-tilt]{transform:none}
.footer-grid>*{min-width:0}.footer-links{gap:8px}
}
@media(prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
*,*::before,*::after{animation:none!important;transition:none!important}
.reveal,.reveal.pending{opacity:1;transform:none}
}