:root{
--bg:#E9E8FA;--bg-panel:#F8F7FF;--bg-panel2:#DCD9F4;--border:#CFCBEA;--accent:#5E25EB;--accent-dark:#3E12A8;--accent-2:#7B4BFF;--violet:#8B5CF6;--coral:#FF7A4D;--pink:#FF8FC8;--peach:#FFD2BC;--text:#1E1243;--text-muted:#5A527A;--success:#14A36B;--warn:#D9822B;--error:#D63A4F;--hero-top:#F3F2FE;--hero-bottom:#E4E2F7;--white:#FFFFFF;--device:#2B2142;--flag-red:#D8263B;--flag-white:#FFFFFF;--flag-blue:#27357E;
--accent-a08:color-mix(in srgb,var(--accent) 8%,transparent);--accent-a12:color-mix(in srgb,var(--accent) 12%,transparent);--accent-a18:color-mix(in srgb,var(--accent) 18%,transparent);--accent-a28:color-mix(in srgb,var(--accent) 28%,transparent);--accent-a45:color-mix(in srgb,var(--accent) 45%,transparent);--accent-a60:color-mix(in srgb,var(--accent) 60%,transparent);--accent-dark-a50:color-mix(in srgb,var(--accent-dark) 50%,transparent);
--violet-a16:color-mix(in srgb,var(--violet) 16%,transparent);--violet-a45:color-mix(in srgb,var(--violet) 45%,transparent);--violet-a78:color-mix(in srgb,var(--violet) 78%,transparent);--accent-a88:color-mix(in srgb,var(--accent) 88%,transparent);--accent-dark-a92:color-mix(in srgb,var(--accent-dark) 92%,transparent);
--coral-a09:color-mix(in srgb,var(--coral) 9%,transparent);--coral-a18:color-mix(in srgb,var(--coral) 18%,transparent);--coral-a55:color-mix(in srgb,var(--coral) 55%,transparent);--peach-a08:color-mix(in srgb,var(--peach) 8%,transparent);--pink-a07:color-mix(in srgb,var(--pink) 7%,transparent);
--white-a20:color-mix(in srgb,var(--white) 20%,transparent);--white-a40:color-mix(in srgb,var(--white) 40%,transparent);--white-a55:color-mix(in srgb,var(--white) 55%,transparent);--white-a75:color-mix(in srgb,var(--white) 75%,transparent);--white-a92:color-mix(in srgb,var(--white) 92%,transparent);
--text-a06:color-mix(in srgb,var(--text) 6%,transparent);--text-a16:color-mix(in srgb,var(--text) 16%,transparent);--text-a40:color-mix(in srgb,var(--text) 40%,transparent);--success-a14:color-mix(in srgb,var(--success) 14%,transparent);--success-a22:color-mix(in srgb,var(--success) 22%,transparent);--panel-a72:color-mix(in srgb,var(--bg-panel) 72%,transparent);--panel-a86:color-mix(in srgb,var(--bg-panel) 86%,transparent);--well:color-mix(in srgb,var(--bg-panel2) 42%,var(--bg-panel));--device-hi:color-mix(in srgb,var(--device) 82%,var(--accent));
--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,-apple-system,sans-serif;
--font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
--r-pill:999px;--r-round:50%;--r-porcelain:48px;--r-xl:32px;--r-lg:24px;--r-md:20px;--r-sm:14px;--r-xs:10px;--r-tiny:3px;--r-logo:11px;--r-screen:25px;
--shadow-card:0 32px 70px -22px var(--accent-a28),0 10px 24px -14px var(--accent-a18);--shadow-soft:0 18px 44px -24px var(--accent-a45);--edge-hi:inset 0 1px 0 var(--white),inset 0 0 0 1px var(--accent-a08);
--gutter:40px;--content-width:1280px;--header-height:72px;--notice-height:40px;--header-stack:112px;--anchor-offset:136px;--toc-offset:208px;
--size-body:17px;--size-h1:66px;--weight-display:900;--section-space:80px;
}
*,*::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:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:0}
button,summary,a{-webkit-tap-highlight-color:var(--accent-a12)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:4px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.5;transform:none}
[hidden]{display:none!important}
img{max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
ul{margin:0;padding:0;list-style:none}
p{margin:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-display);text-wrap:balance}
h1{font-size:var(--size-h1);line-height:1.1;letter-spacing:-.02em;margin:0}
h2{font-size:36px;line-height:1.25;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:24px;line-height:1.35;margin:0 0 16px}
p+p{margin-top:20px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--well);border:1px solid var(--border);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*,:where(.grid,.hero-in,.feature-detail,.footer-grid)>*{min-width:0}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.panel,.card{background:var(--bg-panel);border-radius:var(--r-lg);box-shadow:var(--shadow-soft),var(--edge-hi);padding:32px;min-width:0}
.panel-well{background:var(--bg-panel2)}
.grid{display:grid;gap:24px;grid-template-columns:repeat(3,minmax(0,1fr))}
.stack{display:grid;grid-template-columns:minmax(0,1fr);gap:24px}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.sr{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.ln{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.icon{width:24px;height:24px}
.section-heading{max-width:760px;margin:0 auto 40px;text-align:center}
.section-heading p{color:var(--text-muted)}
.prose{width:100%;max-width:850px;min-width:0;margin-inline:auto;overflow-wrap:anywhere}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose ul,.prose ol{padding-left:24px;margin-block:20px;list-style:revert}
.prose li+li{margin-top:8px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px;color:var(--accent)}
.prose img{border-radius:var(--r-sm)}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.badge,.tag{display:inline-flex;align-items:center;gap:10px;max-width:100%;padding:6px 14px;border-radius:var(--r-pill);background:var(--panel-a72);box-shadow:inset 0 0 0 1px var(--border),inset 0 1px 0 var(--white),0 8px 20px -14px var(--accent-a45);font-size:13.5px;font-weight:700;color:var(--text-muted);overflow-wrap:anywhere}
.badge-dot{width:8px;height:8px;flex-shrink:0;border-radius:var(--r-round);background:linear-gradient(135deg,var(--coral),var(--pink));box-shadow:0 0 0 4px var(--coral-a18)}
.tag{background:var(--accent-a08);color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent-a18)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{min-height:56px;display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:12px 28px;border-radius:var(--r-pill);font-size:16.5px;font-weight:800;letter-spacing:.01em;white-space:nowrap;flex-shrink:0;transition:transform .2s,box-shadow .2s;background:var(--bg-panel);box-shadow:inset 0 0 0 1px var(--border)}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-primary{padding-right:12px;color:var(--white);background:linear-gradient(120deg,var(--accent),var(--accent-2));box-shadow:0 20px 38px -16px var(--accent-a60),0 6px 14px -8px var(--accent-a45),inset 0 1px 0 var(--white-a40)}
.btn-arrow{width:34px;height:34px;border-radius:var(--r-round);display:grid;place-items:center;background:var(--white-a20);box-shadow:inset 0 0 0 1px var(--white-a40)}
.btn-arrow svg{width:16px;height:16px}
.btn-ink,.btn-secondary{color:var(--bg-panel);background:var(--text);box-shadow:0 16px 30px -18px var(--text-a40),inset 0 1px 0 var(--white-a20)}
.btn-small{min-height:44px;padding:10px 20px;font-size:14px}
.notice{position:relative;min-height:var(--notice-height);display:flex;align-items:center;justify-content:center;gap:16px;padding:6px 64px;background:var(--bg-panel2);border-bottom:1px solid var(--border);font-size:14px;font-weight:700;text-align:center}
.notice-msg{display:inline-flex;align-items:center;gap:10px}
.notice-mark{width:16px;height:16px;color:var(--accent)}
.notice-link{font-weight:800;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:5px}
.notice-link:hover{color:var(--accent)}
.notice-x{position:absolute;right:20px;top:50%;width:26px;height:26px;margin-top:-13px;border-radius:var(--r-round);display:grid;place-items:center;background:var(--text);color:var(--bg-panel);padding:0}
.notice-x svg{width:11px;height:11px}
#site-header{position:sticky;top:0;z-index:50}
.topbar{position:relative;height:var(--header-height);z-index:53;background:var(--panel-a86);backdrop-filter:blur(14px) saturate(1.2);border-bottom:1px solid var(--border)}
.topbar .wrap{height:100%;display:flex;align-items:center;gap:20px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{display:block;width:36px;height:36px;border-radius:var(--r-logo);flex-shrink:0}
.brand-en{font-family:var(--font-display);font-weight:900;font-size:20px;line-height:1;letter-spacing:-.02em}
.brand-zh{font-size:14px;font-weight:500;color:var(--text-muted)}
.nav{flex:1;min-width:0}
.nav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:2px}
.nav li{min-width:0}
.nav a{height:38px;display:inline-flex;align-items:center;padding:0 13px;border-radius:var(--r-pill);font-size:14.5px;font-weight:600;color:var(--text-muted);white-space:nowrap;transition:color .2s,background-color .2s}
.nav a:hover{color:var(--text);background:var(--text-a06)}
.nav a[aria-current="page"]{color:var(--accent);background:var(--accent-a08);box-shadow:inset 0 0 0 1px var(--accent-a18);font-weight:700}
.tools{display:flex;align-items:center;gap:10px;flex-shrink:0;margin-left:auto}
.language{position:relative}
.lang{min-height:38px;width:auto;display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:0 14px;border-radius:var(--r-pill);background:var(--bg);box-shadow:inset 0 0 0 1px var(--border);font-size:14px;font-weight:600;white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px;color:var(--text-muted)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:60;min-width:180px;padding:8px;background:var(--bg-panel);border-radius:var(--r-sm);border:1px solid var(--border);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 14px;border-radius:var(--r-xs);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-a08);color:var(--accent)}
.login{min-height:40px;display:inline-flex;align-items:center;justify-content:center;padding:0 22px;border-radius:var(--r-pill);background:linear-gradient(120deg,var(--accent),var(--accent-2));color:var(--white);font-size:14.5px;font-weight:800;box-shadow:0 10px 22px -12px var(--accent-a60),inset 0 1px 0 var(--white-a40);white-space:nowrap}
.login:hover{background:var(--accent-dark)}
.menu-pill{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;padding:8px;border-radius:var(--r-pill);background:var(--bg);box-shadow:inset 0 0 0 1px var(--border)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;transition:transform .2s}
.menu-pill[aria-expanded="true"] .menu-line:first-child{transform:translateY(6px) rotate(45deg)}
.menu-pill[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-pill[aria-expanded="true"] .menu-line:last-child{transform:translateY(-6px) rotate(-45deg)}
.drawer{position:fixed;top:var(--header-stack);right:0;z-index:52;width:min(420px,100%);height:calc(100dvh - var(--header-stack));max-height:calc(100dvh - var(--header-stack));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:20px var(--gutter) 40px;box-shadow:var(--shadow-card)}
.drawer a{display:flex;align-items:center;justify-content:flex-start;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);font-size:16px}
.drawer a:hover,.drawer a[aria-current]{color:var(--accent);background:var(--accent-a08)}
.drawer-languages{margin-top:20px;border-top:1px solid var(--border);padding-top:16px}
.veil{position:fixed;inset:var(--header-stack) 0 0;z-index:51;background:var(--text-a40);width:100%;padding:0}
html.nav-open{overflow:hidden}
html.notice-dismissed{--header-stack:72px;--anchor-offset:96px;--toc-offset:168px}
.site-footer{background:var(--bg-panel2);border-top:1px solid var(--border);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:320px;margin-top:20px;color:var(--text-muted);font-size:15px}
.footer-title{font-size:15px;font-weight:800;margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{margin-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.reveal{transition:opacity .35s,transform .35s}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
[data-count]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono);text-align:right}
#server-status{position:static;display:block;min-height:80px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
.fc-red{fill:var(--flag-red)}.fc-white{fill:var(--flag-white)}.fc-blue{fill:var(--flag-blue)}.fc-edge{fill:none;stroke:var(--text-a16);stroke-width:.7}
@media(min-width:1101px) and (max-width:1320px){.topbar .wrap{gap:14px}.nav a{padding-inline:9px;font-size:13px}.tools{gap:8px}.lang{padding-inline:10px}}
@media(max-width:1100px){.nav{display:none}.menu-pill{display:inline-flex}.tools{margin-left:auto}.footer-grid{gap:28px}}
@media(max-width:768px){
:root{--gutter:24px;--size-h1:40px;--section-space:56px}
h2{font-size:30px}.grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.notice{font-size:12px;padding-inline:24px 48px;gap:10px}.notice-msg{gap:6px}.notice-x{right:12px}.notice-link{white-space:nowrap}.topbar .wrap{gap:10px}.tools{gap:8px;margin-left:auto}.brand-en{font-size:18px}.brand-mark{width:32px;height:32px}.brand{gap:8px}.lang{font-size:12px;padding-inline:10px;min-height:40px}.lang svg{display:none}.login{padding-inline:16px;font-size:13px}.panel,.card{padding:24px}
}
@media(max-width:640px){
:root{--gutter:16px}
.no-break{white-space:normal}
.tilt,[data-tilt]{transform:none}
.decor,.stripe-halo{max-width:100%}
.footer-grid{grid-template-columns:1fr;gap:32px}.footer-brand{grid-column:auto}.footer-bottom{flex-direction:column}
.notice-mark{display:none}.notice-msg{display:block}.notice{font-size:11px}.notice-link{font-size:11px}
}
@media(max-width:359px){.brand-en{font-size:16px}.brand-mark{width:28px;height:28px}.brand{gap:5px}.tools{gap:5px}.lang{font-size:11px;padding-inline:8px}.login{padding-inline:12px}.topbar .wrap{gap:5px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal,.reveal.pending{opacity:1;transform:none;transition:none}*,*::before,*::after{animation:none!important;transition:none!important}}