:root{
--bg:#E8EDF6;--hero-top:#F1F4FB;--hero-bottom:#E1E7F3;--panel:#F6F8FD;--panel-2:#DCE3F0;--panel-3:#EEF2F9;--seg-bg:#D0D8E9;--window:#FBFCFF;--white:#FFFFFF;
--nav-bg:rgba(246,248,253,.88);--border:#CBD4E6;--border-soft:rgba(203,212,230,.72);
--accent:#7A2E8C;--accent-2:#A2479E;--accent-dark:#5A1F69;--accent-tint:#F0E6F4;--accent-tint-2:#E6D5EE;--accent-tint-3:#DCC6E6;--accent-line:rgba(122,46,140,.26);--tab-on:#ECE7F2;--tab-fade:rgba(236,231,242,.35);--hl-band-a:rgba(122,46,140,.14);--hl-band-b:rgba(162,71,158,.22);
--text:#161B2E;--text-muted:#5A6280;--text-faint:#8A92AD;--success:#1E8A5A;--warn:#B7791F;--error:#C0392B;--ink-plum:#2A1631;
--board-a:#CFE3EE;--board-b:#D9DDF4;--board-c:#E9D9EE;--glow-cyan:rgba(150,208,228,.42);--glow-plum:rgba(190,128,204,.26);--dot:rgba(22,27,46,.04);--hi:rgba(255,255,255,.96);--hi-soft:rgba(255,255,255,.6);--frost:rgba(246,248,253,.62);--veil:rgba(22,27,46,.28);--clear:transparent;
--flag-red:#C8283A;--flag-blue:#24418F;--flag-white:#FFFFFF;--flag-edge:rgba(22,27,46,.14);
--sh-win:0 56px 110px -40px rgba(122,46,140,.12),0 26px 52px -30px rgba(90,31,105,.12),0 2px 6px -2px rgba(122,46,140,.12);
--sh-tip:0 32px 70px -22px rgba(122,46,140,.12),0 12px 26px -14px rgba(90,31,105,.14);
--sh-chip:0 14px 30px -16px rgba(122,46,140,.12),0 2px 6px -3px rgba(90,31,105,.10);
--sh-btn:0 10px 22px -14px rgba(122,46,140,.32);--sh-board:0 40px 80px -50px rgba(90,31,105,.20);--sh-groove:inset 0 1px 2px rgba(22,27,46,.06);--sh-login:0 1px 2px rgba(90,31,105,.06);--sh-track:inset 0 1px 2px rgba(22,27,46,.18);--sh-knob:0 1px 3px rgba(90,31,105,.3);
--font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
--font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
--font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
--r-xs:6px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-board:20px;--r-pill:999px;--r-round:50%;--r-line:2px;
--weight-regular:400;--weight-medium:500;--weight-strong:600;
--gutter:40px;--content-width:1360px;--header-height:64px;--anchor-offset:80px;--toc-offset:144px;
--text-size:16px;--small-size:14px;--display-size:64px;--heading-size:36px;--subheading-size:22px;--body-leading:1.6;--title-leading:1.1;--display-tracking:-.03em;--cjk-tracking:-.02em;
--space-section:72px;--ease-out:cubic-bezier(.2,.7,.3,1);--fast:.15s;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-size);line-height:var(--body-leading);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-regular);overflow-wrap:break-word;text-wrap:balance}
h1,.h1{margin:0 0 28px;font-size:var(--display-size);line-height:var(--title-leading);letter-spacing:var(--display-tracking)}
:lang(zh-CN) h1,:lang(zh-TW) h1,:lang(ja) h1,:lang(ko) h1{letter-spacing:var(--cjk-tracking)}
h2{font-size:var(--heading-size);line-height:1.25;margin:0 0 24px}
h3{font-size:var(--subheading-size);line-height:1.4;margin:0 0 16px}
p{margin:0 0 20px}
strong,b{font-weight:var(--weight-medium)}
code{font-family:var(--font-mono);overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-sm);background:var(--panel-2)}
pre code{white-space:pre;overflow-wrap:normal}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--text-muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.panel,.card{min-width:0;padding:28px;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-lg);box-shadow:var(--sh-chip),inset 0 1px 0 var(--hi)}
.panel-groove{background:var(--panel-2);box-shadow:var(--sh-groove)}
.prose{max-width:78ch;min-width:0}
.prose p,.prose li{overflow-wrap:anywhere}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose ul{padding-left:1.4em;list-style:disc;margin-bottom:24px}
.prose ol{padding-left:1.5em;margin-bottom:24px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.btn,.btn-secondary,.btn-login,.btn-main,.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border-radius:var(--r-sm);font-size:var(--small-size);font-weight:var(--weight-medium);white-space:nowrap;flex-shrink:0}
.btn,.btn-secondary{background:var(--window);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--hi)}
.btn:hover,.btn-secondary:hover{border-color:var(--accent-line);background:var(--panel-3)}
.btn-main,.btn-primary{position:relative;height:48px;padding:0 26px;border:0;overflow:hidden;background:var(--accent-tint-2);color:var(--accent-dark);font-size:var(--text-size);box-shadow:inset 0 1px 0 var(--hi-soft),var(--sh-btn);transition:background-color var(--fast)}
.btn-main::after,.btn-primary::after{content:"";position:absolute;inset:auto 0 0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.btn-main:hover,.btn-primary:hover{background:var(--accent-tint-3)}
.btn-main:active,.btn-primary:active{background:var(--accent-tint)}
.btn:disabled,.btn-main:disabled,.btn-primary:disabled{background:var(--panel-2);color:var(--text-muted);box-shadow:none}
.link-more{display:inline-flex;align-items:center;gap:6px;min-height:24px;font-size:15px;color:var(--accent-dark);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:6px;text-decoration-color:var(--accent-line)}
.link-more:hover{text-decoration-color:var(--accent)}
#site-header{position:relative;z-index:60}
.topbar{position:relative;z-index:40;background:var(--nav-bg);border-bottom:1px solid var(--border-soft);backdrop-filter:blur(10px)}
.topbar-in{display:flex;align-items:center;flex-wrap:nowrap;height:var(--header-height);gap:0}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand img{width:28px;height:28px;flex-shrink:0}
.brand-en{font-family:var(--font-display);font-size:18px;font-weight:var(--weight-strong);letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.brand-zh{font-size:var(--small-size);font-weight:var(--weight-regular);color:var(--text-muted);padding-left:10px;border-left:1px solid var(--border)}
.nav{display:flex;align-items:center;flex:1;min-width:0;margin-left:48px}
.nav>ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-link{position:relative;display:inline-flex;align-items:center;gap:4px;min-height:36px;padding:0 12px;border:0;background:none;border-radius:var(--r-sm);font-size:15px;color:var(--text-muted);cursor:pointer;white-space:nowrap;transition:color var(--fast),background-color var(--fast)}
.nav-link:hover{color:var(--text);background:var(--panel-3)}
.nav-link[aria-current="page"]{color:var(--text)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;border-radius:var(--r-line);background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.nav-more{position:relative}
.nav-more:not([open]) .nav-menu{display:none}
.nav-more[open] .nav-menu{display:block}
.nav-more>summary{list-style:none}
.nav-more>summary::-webkit-details-marker{display:none}
.nav-menu{position:absolute;top:calc(100% + 8px);left:0;z-index:60;min-width:168px;padding:6px;background:var(--window);border:1px solid var(--border-soft);border-radius:var(--r-md);box-shadow:var(--sh-chip),inset 0 1px 0 var(--hi)}
.nav-menu a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-xs);font-size:var(--small-size);color:var(--text-muted)}
.nav-menu a:hover,.nav-menu a[aria-current="page"]{background:var(--tab-on);color:var(--accent-dark)}
.tools{display:flex;align-items:center;gap:16px;margin-left:auto;flex-shrink:0}
.lang-switch{position:relative}
.lang-button{display:inline-flex;align-items:center;justify-content:center;gap:4px;width:auto;min-width:44px;min-height:36px;padding:0 8px;border:0;border-radius:var(--r-xs);background:none;font-size:var(--small-size);color:var(--text-muted);white-space:nowrap}
.lang-button span{white-space:nowrap}
.lang-button:hover{color:var(--text)}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:176px;padding:6px;background:var(--window);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--sh-tip)}
.lang-switch.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-xs);font-size:var(--small-size)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--tab-on);color:var(--accent-dark)}
.btn-login{height:38px;min-height:38px;padding:0 18px;border:1px solid var(--border);background:var(--window);color:var(--text);box-shadow:inset 0 1px 0 var(--hi),var(--sh-login);transition:border-color var(--fast)}
.btn-login:hover{border-color:var(--accent-line)}
.menu-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-sm);background:var(--window);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-line)}
.mobile-drawer{display:none}
.nav-veil{display:none}
.notice{background:linear-gradient(90deg,var(--accent-tint),var(--accent-tint-2) 50%,var(--accent-tint));border-bottom:1px solid var(--accent-line)}
.notice-in{display:flex;align-items:center;justify-content:center;gap:12px;height:40px;font-size:var(--small-size);color:var(--text)}
.notice-in a{display:inline-flex;align-items:center;gap:4px;min-height:24px;color:var(--accent-dark);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}
.notice-in a:hover{color:var(--accent)}
.site-footer{padding-top:56px;padding-bottom:32px;border-top:1px solid var(--border);background:var(--panel-3)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-intro{max-width:32ch;margin-top:20px;color:var(--text-muted);font-size:var(--small-size)}
.footer-heading{font-size:var(--small-size);font-weight:var(--weight-medium);margin:0 0 14px}
.footer-links{display:grid;gap:6px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--small-size);color:var(--text-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;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:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.reveal{transition:opacity var(--reveal-time) var(--ease-out),transform var(--reveal-time) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;min-height:80px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
@media(max-width:1240px){:root{--display-size:56px}.nav{margin-left:28px}.nav-link{padding-inline:9px}.tools{gap:10px}}
@media(max-width:980px){.nav{margin-left:24px}.brand-zh{display:none}.nav-link{font-size:var(--small-size);padding-inline:7px}.tools{gap:6px}}
@media(max-width:768px){
:root{--gutter:20px;--display-size:40px;--heading-size:28px;--space-section:48px}
h1,.h1{margin-bottom:24px}
.nav{display:none}
.tools{margin-left:auto;gap:6px}
.menu-toggle{display:inline-flex}
.lang-button{max-width:100%;font-size:12px;padding-inline:4px}
.btn-login{padding-inline:12px}
.mobile-drawer{position:fixed;top:var(--header-height);left:0;right:0;z-index:35;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--panel);border-top:1px solid var(--border)}
.mobile-drawer.is-open{display:block}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 14px;border-bottom:1px solid var(--border-soft);font-size:var(--text-size)}
.mobile-drawer a[aria-current]{background:var(--tab-on);color:var(--accent-dark)}
.drawer-languages{padding-top:20px}
.drawer-languages a{font-size:var(--small-size)}
.nav-veil.is-open{display:block;position:fixed;top:var(--header-height);inset-inline:0;bottom:0;z-index:30;background:var(--veil)}
.notice-in{height:auto;min-height:40px;padding-block:10px;flex-wrap:wrap;gap:4px 10px;text-align:center}
.grid-three,.grid-two{grid-template-columns:minmax(0,1fr)}
.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.footer-grid>div:first-child{grid-column:1/-1}
}
@media(max-width:640px){
.no-break{white-space:normal}
.tilt,[data-tilt]{transform:none}
.hero,.rig,.decoration-region{max-width:100%;overflow-x:clip}
}
@media(max-width:380px){
:root{--gutter:16px}
.brand{gap:6px}.brand-en{font-size:16px}.brand img{width:24px;height:24px}
.tools{gap:3px}.lang-button{font-size:11px}.btn-login{padding-inline:9px;font-size:12px}
}
@media(prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
.reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}