@font-face{font-family:Inter;src:url(/fonts/site/Inter-var.woff2)format("woff2");font-weight:400 700;font-style:normal;font-display:swap}@font-face{font-family:Outfit;src:url(/fonts/site/Outfit-var.woff2)format("woff2");font-weight:500 800;font-style:normal;font-display:swap}@property --tint{syntax:"<color>";inherits:true;initial-value:#6366f1}@property --tint-hi{syntax:"<color>";inherits:true;initial-value:#a5b4fc}:root{--bg0:#0b0a1f;--bg1:#151238;--bg2:#1e1b4b;--indigo:#6366f1;--indigo-hi:#818cf8;--violet:#8b5cf6;--ok:#34d399;--warn:#fbbf24;--danger:#f87171;--text:#f1f0ff;--text2:#b4b2d8;--text3:#7b79a8;--glass:#ffffff0e;--glass-2:#ffffff16;--line:#ffffff1f;--line-hi:#ffffff3b;--shadow:0 24px 60px -20px #050314b3, 0 2px 8px #05031459;--r-sm:10px;--r:16px;--r-lg:24px;--r-xl:32px;--font:"Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;--display:"Outfit", "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", system-ui, sans-serif;--wrap:1200px;--pad:clamp(20px, 5vw, 40px);--ease:cubic-bezier(.22,.61,.36,1);--ease-out:cubic-bezier(.16,1,.3,1);--hdr-h:64px;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:calc(var(--hdr-h) + 16px);background:var(--bg0)}body{background:var(--bg0);min-height:100vh;color:var(--text);font:400 16px/1.6 var(--font);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;overflow-x:clip}html,.main{overflow-x:clip}html[lang^=zh] body{line-height:1.75}body:before{content:"";z-index:-1;pointer-events:none;background:radial-gradient(40vw 32vw at 12% 4%, #6366f138, transparent 70%), radial-gradient(36vw 30vw at 92% 12%, #8b5cf629, transparent 70%), radial-gradient(50vw 40vw at 70% 96%, #4f46e524, transparent 70%), linear-gradient(160deg, #141137 0%, var(--bg0) 45%, #0d0b26 100%);position:fixed;top:-10vh;bottom:-10vh;left:-10vw;right:-10vw}img{max-width:100%;height:auto;display:block}a{color:var(--indigo-hi);text-decoration:none}a:hover{color:#a5b4fc}:focus-visible{outline:2px solid var(--indigo-hi);outline-offset:3px;border-radius:6px}h1,h2,h3,h4{font-family:var(--display);letter-spacing:-.025em;color:var(--text);text-wrap:balance;margin:0;font-weight:700;line-height:1.08}html[lang^=zh] h1,html[lang^=zh] h2,html[lang^=zh] h3{letter-spacing:0;line-height:1.25}p{margin:0}button{font:inherit;color:inherit}input,select,textarea{font:inherit;color:var(--text);font-size:16px}::selection{background:#6366f173}.skip{z-index:100;background:var(--indigo);color:#fff;border-radius:10px;padding:10px 16px;transition:top .2s;position:absolute;top:-60px;left:12px}.skip:focus{color:#fff;top:12px}.wrap{width:100%;max-width:var(--wrap);padding-inline:max(var(--pad), env(safe-area-inset-left)) max(var(--pad), env(safe-area-inset-right));margin-inline-start:auto;margin-inline-end:auto}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;overflow:hidden;position:absolute!important}.eyebrow{font:600 12.5px/1 var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--indigo-hi);align-items:center;gap:10px;margin-bottom:18px;display:inline-flex}.eyebrow:before{content:"";background:currentColor;border-radius:50%;width:6px;height:6px;box-shadow:0 0 12px}html[lang^=zh] .eyebrow{letter-spacing:.06em}.lead{color:var(--text2);max-width:680px;font-size:clamp(16.5px,1.6vw,19px);line-height:1.6}.muted{color:var(--text2)}.dim{color:var(--text3)}.grad{background:linear-gradient(100deg,#fff 10%,#c7d2fe 45%,#a5b4fc 70%,#c4b5fd);color:#0000;-webkit-background-clip:text;background-clip:text}.btn{--b:#ffffff24;border:1px solid var(--b);background:var(--glass);min-height:44px;color:var(--text);font:600 15px/1 var(--font);letter-spacing:-.005em;cursor:pointer;white-space:nowrap;transition:transform .25s var(--ease-out), background .25s, border-color .25s, box-shadow .25s;-webkit-tap-highlight-color:transparent;border-radius:999px;justify-content:center;align-items:center;gap:9px;padding:0 20px;display:inline-flex;position:relative}.btn:hover{color:var(--text);background:var(--glass-2);border-color:var(--line-hi);transform:translateY(-1px)}.btn:active{transform:translateY(0)scale(.98)}.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}.btn svg{flex:none;width:18px;height:18px}.btn-primary{background:linear-gradient(#7c7ff6 0%,#6366f1 55%,#5b54e8 100%);border-color:#a5b4fc73;box-shadow:0 10px 30px -10px #6366f1cc,inset 0 1px #ffffff59}.btn-primary:hover{background:linear-gradient(#8b8ef8 0%,#6e71f3 55%,#6159ec 100%);border-color:#c7d2fe99;box-shadow:0 14px 36px -10px #6366f1f2,inset 0 1px #fff6}.btn-white{color:#14112f;background:#f1f0ff;border-color:#fff}.btn-white:hover{color:#14112f;background:#fff}.btn-ghost{background:0 0}.btn-danger{color:#fecaca;background:#f871711f;border-color:#f8717173}.btn-danger:hover{color:#fff;background:#f8717133;border-color:#f87171b3}.btn-lg{min-height:52px;padding:0 26px;font-size:16px}.btn-sm{min-height:36px;padding:0 14px;font-size:14px}.btn-block{width:100%}.glass{border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(24px)saturate(140%);backdrop-filter:blur(24px)saturate(140%);background:linear-gradient(145deg,#ffffff13,#ffffff06);position:relative}.glass:before{content:"";border-radius:inherit;pointer-events:none;background:linear-gradient(#ffffff14,#0000 40%);position:absolute;top:0;bottom:0;left:0;right:0;-webkit-mask:linear-gradient(#000,#0000 60%);mask:linear-gradient(#000,#0000 60%)}.hdr{z-index:50;padding-top:env(safe-area-inset-top);border-bottom:1px solid #0000;transition:background .3s,border-color .3s,-webkit-backdrop-filter .3s,backdrop-filter .3s;position:sticky;top:0}.hdr.scrolled,.main-account~.hdr,.hdr.solid{-webkit-backdrop-filter:blur(20px)saturate(150%);backdrop-filter:blur(20px)saturate(150%);background:#0b0a1f9e;border-bottom-color:#ffffff12}.hdr-in{height:var(--hdr-h);max-width:var(--wrap);padding-inline:max(var(--pad), env(safe-area-inset-left)) max(var(--pad), env(safe-area-inset-right));align-items:center;gap:24px;margin:0 auto;display:flex}.brand{color:var(--text);font:700 19px/1 var(--display);letter-spacing:-.02em;flex:none;align-items:center;gap:10px;display:inline-flex}.brand:hover{color:#fff}.brand img{filter:drop-shadow(0 4px 12px #6366f173);border-radius:9px;width:32px;height:32px}.hdr-nav{align-items:center;gap:4px;margin-left:12px;display:flex}.hdr-nav a{color:var(--text2);border-radius:999px;padding:8px 12px;font-size:15px;font-weight:500;transition:color .2s,background .2s}.hdr-nav a:hover,.hdr-nav a.router-link-active{color:var(--text);background:#ffffff0f}.hdr-act{align-items:center;gap:10px;margin-left:auto;display:flex}.hdr-link{color:var(--text2);border-radius:999px;padding:8px 10px;font-size:15px;font-weight:500}.hdr-link:hover{color:var(--text)}.lang-btn{border:1px solid var(--line);height:36px;color:var(--text2);font:600 13px/1 var(--font);letter-spacing:.04em;cursor:pointer;background:#ffffff0a;border-radius:999px;align-items:center;gap:6px;padding:0 12px;display:inline-flex}.hdr-burger{display:none}@media (max-width:980px){.hdr-nav{display:none}}@media (max-width:640px){.hdr-in{gap:10px}.hdr-link,.hdr-cta{display:none}.hdr-burger{border:1px solid var(--line);cursor:pointer;background:#ffffff0a;border-radius:12px;justify-content:center;align-items:center;width:40px;height:40px;display:inline-flex}}.crumbs{padding-top:22px}.crumbs ol{color:var(--text3);flex-wrap:wrap;gap:6px;margin:0;padding:0;font-size:13.5px;list-style:none;display:flex}.crumbs li{align-items:center;gap:6px;min-width:0;display:inline-flex}.crumbs li+li:before{content:"";opacity:.7;border-top:1.5px solid;border-right:1.5px solid;width:5px;height:5px;margin-right:2px;transform:rotate(45deg)}.crumbs a{color:var(--text2)}.crumbs a:hover{color:var(--text)}.crumbs span{color:var(--text3);text-overflow:ellipsis;white-space:nowrap;max-width:60vw;overflow:hidden}.main{min-height:60vh}.sec{padding-block-start:clamp(72px,10vw,128px);padding-block-end:clamp(72px,10vw,128px)}.sec-head{max-width:760px;margin-bottom:clamp(36px,5vw,56px)}.sec-head.center{text-align:center;margin-inline-start:auto;margin-inline-end:auto}.sec-head.center .lead{margin-inline-start:auto;margin-inline-end:auto}.sec-head h2,.page-head h1{margin-bottom:18px;font-size:clamp(34px,5vw,56px)}.page-head{padding-top:clamp(36px,6vw,72px);padding-bottom:clamp(24px,4vw,40px)}.page-head h1{font-size:clamp(38px,6vw,68px)}.page-head .lead{margin-top:4px}.ssr-list{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin:24px 0 0;padding:0;list-style:none;display:grid}.ssr-list h3,.ssr-list h2{margin-bottom:6px;font-size:20px}.ssr-list p{color:var(--text2)}.ssr-mod{margin-top:28px}.ssr-mod h3{margin-bottom:6px;font-size:22px}.ssr-mod p,.ssr-mod li{color:var(--text2)}.ssr-table{border-collapse:collapse;width:100%;margin-top:20px;font-size:14px}.ssr-table th,.ssr-table td{border-bottom:1px solid var(--line);text-align:left;padding:8px}details summary{cursor:pointer}.hero{text-align:center;padding-top:clamp(48px,8vw,96px)}.hero-in{flex-direction:column;align-items:center;display:flex}.hero-title{letter-spacing:-.045em;max-width:13ch;margin-bottom:26px;font-size:clamp(44px,8.2vw,96px);line-height:.98}html[lang^=zh] .hero-title{letter-spacing:0;max-width:14em;line-height:1.15}.hero-lead{color:var(--text2);max-width:640px;margin-bottom:34px;font-size:clamp(17px,1.9vw,20px)}.hero-cta{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.hero-note{color:var(--text3);flex-wrap:wrap;justify-content:center;gap:6px 18px;margin:22px 0 0;padding:0;font-size:13.5px;list-style:none;display:flex}.hero-note li{align-items:center;gap:7px;display:inline-flex}.hero-note li:before{content:"";background:var(--ok);width:5px;height:5px;box-shadow:0 0 8px var(--ok);border-radius:50%}.article{max-width:820px;padding-top:clamp(28px,4vw,48px);padding-bottom:clamp(64px,8vw,110px)}.article-head h1{margin-bottom:16px;font-size:clamp(34px,5.4vw,56px)}.article-meta{color:var(--text3);margin-bottom:26px;font-size:14px}.prose{color:#d9d8f2;font-size:17px;line-height:1.75}.prose>*+*,.prose section>*+*{margin-top:1.05em}.prose h2{margin-top:2.1em;margin-bottom:.2em;scroll-margin-top:90px;font-size:clamp(25px,3vw,32px)}.prose h3{margin-top:1.6em;font-size:20px}.prose a{color:#a5b4fc;text-underline-offset:3px;-webkit-text-decoration:underline #a5b4fc66;text-decoration:underline #a5b4fc66}.prose a:hover{text-decoration-color:currentColor}.prose strong{color:var(--text);font-weight:650}.prose ul,.prose ol{padding-left:1.3em}.prose li+li{margin-top:.45em}.prose li::marker{color:var(--indigo-hi)}.prose code,.prose kbd{border:1px solid var(--line);background:#ffffff12;border-radius:6px;padding:.1em .4em;font:500 .88em ui-monospace,SF Mono,Menlo,monospace}.prose kbd{box-shadow:inset 0 -1px #ffffff1f}.prose blockquote{border-left:3px solid var(--indigo);color:var(--text);background:#6366f114;border-radius:0 12px 12px 0;margin:1.4em 0;padding:14px 20px}.prose table{border-collapse:collapse;width:100%;font-size:15px;display:block;overflow-x:auto}.prose th,.prose td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:10px 12px}.prose th{color:var(--text);background:#ffffff0a;font-weight:600}.prose mark{color:#fde68a;background:#fbbf242e;border-radius:4px;padding:0 .2em}.intro{color:var(--text2);font-size:19px}.toc{border:1px solid var(--line);border-radius:var(--r);background:#ffffff09;margin:28px 0 8px;padding:20px 24px}.toc p{font:600 12.5px/1 var(--font);letter-spacing:.12em;text-transform:uppercase;color:var(--text3);margin-bottom:12px}.toc ol{columns:2 280px;column-gap:32px;margin:0;padding-left:1.2em}.toc li{break-inside:avoid;margin:0 0 6px}.toc a{color:var(--text2)}.toc a:hover{color:var(--text)}.article-faq{margin-top:56px}.article-faq h2{margin-bottom:16px;font-size:28px}.article-cta{border-radius:var(--r-lg);background:radial-gradient(120% 140% at 0 0,#6366f147,#8b5cf614 60%,#0000);border:1px solid #a5b4fc40;margin-top:56px;padding:32px}.article-cta h2{margin-bottom:8px;font-size:26px}.article-cta 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#ffffff12;margin-top:40px}.ftr-in{max-width:var(--wrap);padding:64px var(--pad) 36px;grid-template-columns:1.4fr repeat(3,1fr);gap:40px;margin:0 auto;display:grid}.ftr-brand p{color:var(--text3);max-width:260px;margin-top:14px}.ftr-col h2{font:600 12.5px/1 var(--font);letter-spacing:.12em;text-transform:uppercase;color:var(--text3);margin-bottom:16px}.ftr-col a{color:var(--text2);padding:5px 0;font-size:15px;display:block}.ftr-col a:hover{color:var(--text)}.ftr-langs{max-width:var(--wrap);padding:0 var(--pad) 22px;flex-wrap:wrap;gap:6px 16px;margin:0 auto;font-size:13.5px;display:flex}.ftr-langs a{color:var(--text3)}.ftr-langs a:hover,.ftr-langs a.on{color:var(--text)}.ftr-base{max-width:var(--wrap);padding:22px var(--pad) 34px;color:var(--text3);border-top:1px solid #ffffff0f;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;margin:0 auto;font-size:13px;display:flex}.ftr-apple{max-width:520px}@media (max-width:820px){.ftr-in{grid-template-columns:1fr 1fr}.ftr-brand{grid-column:1/-1}}.nf,.auth-ssr{text-align:center;padding-block-start:clamp(64px,12vw,140px);padding-block-end:clamp(64px,12vw,140px)}.nf h1{margin-bottom:16px;font-size:clamp(36px,6vw,64px)}.nf .lead{margin:0 auto 28px}.auth-ssr h1{margin-bottom:12px;font-size:34px}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}}.tm-badge{font:600 11px/1 var(--font);letter-spacing:.1em;text-transform:uppercase;color:#fde68a;border:1px dashed #fbbf2473;border-radius:999px;align-self:flex-start;padding:5px 9px}.how-n{border:1px solid var(--line-hi);width:36px;height:36px;font:600 15px/1 var(--display);border-radius:50%;flex:none;place-items:center;display:grid}.mod-link{color:var(--text);z-index:1;align-items:center;gap:6px;margin-top:16px;font-size:14.5px;font-weight:600;display:inline-flex;position:relative}.mod-link svg{transition:transform .3s var(--ease-out)}.mod-link:hover svg{transform:translate(3px)}.mod-link:hover{color:#fff}@keyframes chipf{50%{translate:0 -8px}}.faq-narrow{max-width:860px}.cards3{grid-template-columns:repeat(3,1fr);gap:18px;display:grid}.ccard{color:var(--text);transition:transform .4s var(--ease-out), border-color .3s;flex-direction:column;gap:10px;padding:26px;display:flex}.ccard:hover{border-color:var(--line-hi);color:var(--text);transform:translateY(-4px)}.ccard-k{font:600 12px/1 var(--font);letter-spacing:.1em;text-transform:uppercase;color:var(--indigo-hi);min-height:12px}.ccard h3,.ccard h2{font-size:21px}.ccard p{color:var(--text2);flex:1;font-size:15px}@media (max-width:900px){.cards3{grid-template-columns:1fr}}@media (min-width:640px) and (max-width:900px){.cards3{grid-template-columns:repeat(2,1fr)}}.form{gap:16px;display:grid}.field{gap:7px;display:grid}.field>span{color:var(--text2);font-size:14px;font-weight:500}.input{width:100%;min-height:48px;color:var(--text);-webkit-appearance:none;appearance:none;background:#08071a73;border:1px solid #ffffff24;border-radius:13px;padding:12px 14px;font-size:16px;transition:border-color .2s,box-shadow .2s,background .2s}.input::placeholder{color:var(--text3)}.input:focus{background:#08071a99;border-color:#a5b4fcb3;outline:none;box-shadow:0 0 0 4px #6366f138}.input.err{border-color:#f87171b3}.input.mono{letter-spacing:.06em;text-transform:uppercase;font-family:ui-monospace,SF Mono,Menlo,monospace}.ferr{color:#fca5a5;font-size:13.5px}.hint{color:var(--text3);font-size:13px}.check{color:var(--text2);cursor:pointer;align-items:flex-start;gap:10px;font-size:14px;display:flex}.check input{width:20px;height:20px;accent-color:var(--indigo);flex:none;margin:1px 0 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10px);right:0;box-shadow:0 30px 70px -20px #03020fd9,inset 0 0 0 1px #ffffff0a,inset 0 1px #ffffff2e}.lang.up .lang-menu{transform-origin:100% 100%;top:auto;bottom:calc(100% + 10px)}.lang-title{font:600 11.5px/1 var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--text3);padding:10px 12px 8px}.lang-menu ul{margin:0;padding:0;list-style:none}.lang-menu button{width:100%;color:var(--text2);cursor:pointer;text-align:left;background:0 0;border:0;border-radius:12px;align-items:center;gap:12px;padding:10px 12px;font-size:15px;transition:background .15s,color .15s;display:flex}.lang-menu button:hover{color:var(--text);background:#ffffff14;outline:none}.lang-menu button:focus-visible{color:var(--text);background:#ffffff14;outline:none}.lang-menu button[aria-selected=true]{color:var(--text);background:#6366f138}.lang-code{width:26px;font:600 11.5px/1 var(--font);letter-spacing:.06em;color:var(--text3)}.lang-name{flex:1}.lang-check{color:var(--indigo-hi)}.lang-pop-enter-active{transition:opacity .22s var(--ease-out), transform .28s var(--ease-out)}.lang-pop-leave-active{transition:opacity .14s,transform .14s}.lang-pop-enter-from,.lang-pop-leave-to{opacity:0;transform:translateY(-6px)scale(.96)}.lang.up .lang-pop-enter-from,.lang.up .lang-pop-leave-to{transform:translateY(6px)scale(.96)}.lang-pop-enter-active li{animation:lang-in .32s var(--ease-out) both}.lang-pop-enter-active li:nth-child(2){animation-delay:20ms}.lang-pop-enter-active li:nth-child(3){animation-delay:40ms}.lang-pop-enter-active li:nth-child(4){animation-delay:60ms}.lang-pop-enter-active li:nth-child(5){animation-delay:80ms}.lang-pop-enter-active li:nth-child(6){animation-delay:.1s}.lang-pop-enter-active li:nth-child(7){animation-delay:.12s}.lang-pop-enter-active li:nth-child(8){animation-delay:.14s}@keyframes lang-in{0%{opacity:0;transform:translateY(-4px)}}.msheet{inset:calc(var(--hdr-h) + env(safe-area-inset-top)) 0 0;z-index:49;padding:18px var(--pad) calc(28px + env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(26px)saturate(150%);backdrop-filter:blur(26px)saturate(150%);background:#0b0a1fdb;flex-direction:column;justify-content:space-between;display:flex;position:fixed}.msheet nav{flex-direction:column;display:flex}.msheet nav a{color:var(--text);font:600 24px/1.2 var(--display);letter-spacing:-.02em;animation:sheet-in .45s var(--ease-out) both;animation-delay:calc(var(--i) * 35ms);border-bottom:1px solid #ffffff12;padding:16px 4px}.sheet-enter-active,.sheet-leave-active{transition:opacity .25s}.sheet-enter-from,.sheet-leave-to{opacity:0}@keyframes sheet-in{0%{opacity:0;transform:translateY(10px)}}html.menu-open{overflow:hidden}.ftr-lang{margin-top:22px}.ftr-lang .lang-menu{transform-origin:0 100%;left:0;right:auto}.page-enter-active{transition:opacity .26s var(--ease-out), transform .26s var(--ease-out)}.page-leave-active{transition:opacity .16s ease-in}.page-enter-from{opacity:0;transform:translateY(10px)}.page-leave-to{opacity:0}.topbar{z-index:90;pointer-events:none;transform-origin:0;opacity:0;background:linear-gradient(90deg, var(--indigo), var(--violet), #a5b4fc);height:2px;transition:transform .3s,opacity .3s .1s;position:fixed;top:0;left:0;right:0;transform:scaleX(0);box-shadow:0 0 12px #818cf8cc}.topbar.on{opacity:1;transition:transform 2.5s cubic-bezier(.1,.6,.2,1),opacity .15s;transform:scaleX(.75)}.rv{opacity:0;transition:opacity .9s var(--ease-out), transform .9s var(--ease-out);transition-delay:var(--rv-d,0s);transform:translateY(26px)}.rv.rv-in{opacity:1;transform:none}.toasts{left:50%;bottom:calc(20px + env(safe-area-inset-bottom));z-index:95;pointer-events:none;flex-direction:column;align-items:center;gap:8px;width:min(92vw,460px);display:flex;position:fixed;transform:translate(-50%)}.toast{pointer-events:auto;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:var(--shadow);background:#1e1b4beb;border:1px solid #ffffff29;border-radius:14px;padding:12px 18px;font-size:15px}.toast.ok{border-color:#34d39973}.toast.err{border-color:#f871718c}.toast-enter-active,.toast-leave-active{transition:all .3s var(--ease-out)}.toast-enter-from,.toast-leave-to{opacity:0;transform:translateY(12px)}