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0 0 1px #11111114;--qx-color-canvas:var(--app-canvas);--qx-color-surface:var(--app-canvas);--qx-color-surface-raised:var(--app-canvas);--qx-color-surface-muted:var(--app-sidebar);--qx-color-surface-strong:var(--app-surface);--qx-color-ink:var(--app-ink);--qx-color-ink-soft:var(--app-ink-soft);--qx-color-muted:var(--app-muted);--qx-color-faint:var(--lightningcss-light,#929292)var(--lightningcss-dark,#858585);--qx-color-rule:var(--app-border);--qx-color-rule-strong:var(--app-border-strong);--qx-color-accent:var(--app-ink);--qx-color-accent-hover:var(--app-ink-soft);--qx-color-accent-soft:var(--app-surface);--qx-color-accent-muted:var(--app-surface-subtle);--qx-color-on-accent:var(--app-canvas);--qx-color-danger:var(--app-danger);--qx-color-danger-line:var(--lightningcss-light,#e2c2bd)var(--lightningcss-dark,#503430);--qx-color-danger-soft:var(--lightningcss-light,#fff1f0)var(--lightningcss-dark,#241312);--qx-color-notice:var(--app-ink-soft);--qx-color-notice-line:var(--app-border-strong);--qx-color-notice-soft:var(--app-surface-subtle);min-height:100dvh;color:var(--app-ink-soft);background:var(--app-canvas);isolation:isolate;grid-template-rows:minmax(100dvh,auto);grid-template-columns:240px minmax(0,1fr);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:14px;display:grid;position:relative}.app-frame__backdrop{z-index:0;pointer-events:none;background:var(--lightningcss-light,#f7f7f3)var(--lightningcss-dark,#202421);position:fixed;inset:0;overflow:hidden}.app-frame__shader-canvas{z-index:0;opacity:.8;filter:none;position:absolute;inset:0}.app-frame--rail-collapsed{grid-template-columns:64px minmax(0,1fr)}.app-frame--immersive{grid-template-columns:minmax(0,1fr)}.masthead,.mobile-navigation{display:none}.skip-link{z-index:100;border:1px solid var(--app-border-strong);color:var(--app-ink);background:var(--app-canvas);border-radius:8px;padding:7px 11px;font-size:12px;text-decoration:none;position:fixed;top:8px;left:252px;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.desktop-rail{z-index:30;width:240px;height:100dvh;min-height:560px;box-shadow:none;-webkit-backdrop-filter:blur(24px)saturate(1.08)contrast(1.02);background:linear-gradient(108deg,var(--lightningcss-light,#ffffff4d)var(--lightningcss-dark,#2121214d),#0000 42%),linear-gradient(var(--lightningcss-light,#fafaf785)var(--lightningcss-dark,#1f1f1785),var(--lightningcss-light,#f4f6f257)var(--lightningcss-dark,#1b1e1857));border-right:0;flex-direction:column;grid-area:1/1;transition:width .16s;display:flex;position:sticky;top:0;overflow:hidden}.desktop-rail--collapsed{width:64px}.desktop-rail:has(.desktop-rail__notification-panel){overflow:visible}.desktop-rail__topbar{flex:none;justify-content:space-between;align-items:center;gap:8px;height:56px;padding:0 12px;display:flex}.desktop-rail__brand,.wordmark{min-width:0;color:var(--app-ink);align-items:center;gap:10px;text-decoration:none;display:inline-flex}.desktop-rail__brand strong,.wordmark strong{letter-spacing:-.01em;text-overflow:clip;white-space:nowrap;font-size:14px;font-weight:500;overflow:hidden}.product-mark{width:28px;height:28px;color:var(--app-ink);background:currentColor;flex:none;place-items:center;display:grid;-webkit-mask-image:url(/assets/qunxue-brand-mark-CopEegFo.svg);mask-image:url(/assets/qunxue-brand-mark-CopEegFo.svg);-webkit-mask-position:50%;mask-position:50%;-webkit-mask-size:26px 26px;mask-size:26px 26px;-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat}.desktop-rail__collapse{width:32px;height:32px;color:var(--app-muted);cursor:pointer;background:0 0;border:0;border-radius:8px;flex:none;place-items:center;padding:0;display:grid}.desktop-rail__collapse:hover{color:var(--app-ink);background:var(--app-surface)}.desktop-rail--collapsed .desktop-rail__topbar{justify-content:center;padding-inline:8px}.desktop-rail--collapsed .desktop-rail__brand{display:none}.desktop-rail__body{flex-direction:column;flex:1;min-height:0;padding:7px 8px 16px;display:flex}.desktop-rail__secondary{flex:1;min-height:0;display:flex}.desktop-rail--collapsed .desktop-rail__secondary{display:none}.desktop-navigation{flex-direction:column;gap:2px;display:flex}.desktop-navigation a,.mobile-navigation a{color:var(--app-ink-soft);text-decoration:none}.desktop-navigation a{white-space:nowrap;border-radius:8px;align-items:center;gap:10px;min-height:38px;padding:0 10px;font-size:14px;font-weight:400;display:flex}.desktop-navigation a:hover{background:var(--lightningcss-light,#ffffff61)var(--lightningcss-dark,#21212161)}.desktop-navigation a[aria-current=page]{color:var(--app-ink);background:var(--lightningcss-light,#1e232012)var(--lightningcss-dark,#e2e4e312);box-shadow:inset 0 0 0 1px var(--lightningcss-light,#ffffff6b)var(--lightningcss-dark,#0000)}.navigation-icon{flex:none;place-items:center;width:18px;height:18px;display:grid}.desktop-rail--collapsed .navigation-label{display:none}.desktop-rail--collapsed .desktop-navigation a{justify-content:center;padding-inline:0}.desktop-rail__account{box-shadow:none;background:0 0;border:0;flex:none;align-items:center;gap:4px;margin:0;padding:8px 12px 10px;display:flex;position:relative}.desktop-rail__account>a,.desktop-rail__account>button{min-width:0;min-height:40px;color:var(--app-muted);cursor:pointer;background:0 0;border:0;border-radius:8px;align-items:center;gap:9px;padding:0 8px;display:flex}.desktop-rail__identity{flex:1;text-decoration:none}.desktop-rail__account>button{flex:0 0 40px;justify-content:center;position:relative}.desktop-rail__notifications svg{transform-origin:50% 12%;animation:2.8s ease-in-out infinite notification-bell-ring}.desktop-rail__notification-dot{background:var(--lightningcss-light,#c73b32)var(--lightningcss-dark,#b7716c);border:1.5px solid var(--lightningcss-light,#f8f8f5)var(--lightningcss-dark,#474738);border-radius:50%;width:7px;height:7px;position:absolute;top:8px;right:8px}.desktop-rail__account>a:hover,.desktop-rail__account>button:hover,.desktop-rail__account>a[aria-current=page]{color:var(--app-ink);background:var(--lightningcss-light,#ffffff61)var(--lightningcss-dark,#21212161)}.app-frame:has(.knowledge-library__shader) .app-frame__backdrop{background:radial-gradient(at 8% 18%,var(--lightningcss-light,#8fa4bf2e)var(--lightningcss-dark,#3943512e),#0000 58%),var(--lightningcss-light,#f7f7f3)var(--lightningcss-dark,#1e1e17)}.desktop-rail__avatar{width:40px;height:40px;color:var(--app-ink);background:var(--lightningcss-light,#ffffffb8)var(--lightningcss-dark,#212121b8);border-radius:50%;flex:none;place-items:center;font-size:15px;font-weight:500;display:grid}.desktop-rail__account>a>strong{text-overflow:ellipsis;white-space:nowrap;min-width:0;color:var(--app-ink);font-size:13px;font-weight:600;overflow:hidden}.desktop-rail__notification-panel{z-index:40;border:1px solid var(--app-border);width:min(300px,100vw - 274px);max-height:min(560px,100dvh - 24px);color:var(--app-ink);background:var(--lightningcss-light,#fffffffa)var(--lightningcss-dark,#212121fa);border-radius:16px;padding:14px;position:absolute;bottom:0;left:calc(100% + 10px);overflow-y:auto;box-shadow:0 14px 36px #1f252124}.app-frame--rail-collapsed .desktop-rail__notification-panel{width:min(280px,100vw - 98px)}.desktop-rail__notification-panel h2{letter-spacing:-.04em;margin:0 0 10px;font-size:14px;line-height:1.2}.desktop-rail__notification-tabs{border-radius:var(--radius-large);background:var(--app-surface);gap:2px;width:fit-content;margin-bottom:14px;padding:4px;display:flex}.desktop-rail__notification-tabs button{border-radius:var(--radius-control);min-height:28px;color:var(--app-muted);font:inherit;cursor:pointer;background:0 0;border:0;padding:0 9px;font-size:11px;font-weight:600}.desktop-rail__notification-tabs button[aria-selected=true]{color:var(--app-ink);background:var(--app-canvas);box-shadow:0 1px 5px #1f25211f}.desktop-rail__notification-item strong{font-size:12px;line-height:1.45;display:block}.desktop-rail__notification-item p{color:var(--app-muted);margin:6px 0 12px;font-size:11px;line-height:1.6}.desktop-rail__notification-item time,.desktop-rail__notification-empty{color:var(--lightningcss-light,#9a9a9a)var(--lightningcss-dark,#858585);font-size:10px}.desktop-rail__notification-empty{margin:0}.desktop-rail--collapsed .desktop-rail__account>a>strong,.desktop-rail--collapsed .desktop-rail__notifications{display:none}.desktop-rail--collapsed .desktop-rail__account>a{justify-content:center;padding:0}.desktop-rail__session{background:var(--app-muted);border-radius:50%;width:8px;height:8px;margin:16px;animation:1.3s ease-in-out infinite loading-breathe}@keyframes notification-bell-ring{0%,78%,to{transform:rotate(0)}82%{transform:rotate(12deg)}86%{transform:rotate(-10deg)}90%{transform:rotate(7deg)}94%{transform:rotate(-4deg)}}@media (prefers-reduced-motion:reduce){.desktop-rail__notifications svg{animation:none}}.page-shell{z-index:1;background:0 0;grid-area:1/2;width:min(1080px,100% - 64px);min-width:0;margin:0 auto;padding:32px 0 64px;position:relative}.page-shell--wide,.page-shell--workspace{width:100%;margin:0;padding:0}.page-shell--workspace{height:100dvh;overflow:hidden}.page-shell--immersive{grid-column:1;width:100%;min-height:100dvh;margin:0;padding:0}.page-title{border-bottom:1px solid var(--app-border);gap:8px;padding:24px 0 28px;display:grid}.eyebrow,.section-index{color:var(--app-muted);letter-spacing:.08em;text-transform:uppercase;margin:0;font-size:11px;font-weight:500}.display-title{color:var(--app-ink);letter-spacing:-.025em;margin:0;font-size:22px;font-weight:500;line-height:1.25}.page-title__lede{color:var(--app-muted);margin:0;font-size:13px;line-height:1.5}.page-content{min-width:0}.page-placeholder{max-width:640px;color:var(--app-muted);margin:24px 0 0;line-height:1.6}.research-library{background:var(--app-canvas);min-height:100dvh}.research-library__header{border-bottom:1px solid var(--app-border);justify-content:space-between;align-items:center;gap:24px;height:56px;padding:0 16px;display:flex}.research-library__header h1{color:var(--app-ink);letter-spacing:-.01em;margin:0;font-size:14px;font-weight:500}.research-library__header>a{min-height:34px;color:var(--app-canvas);background:var(--app-ink);border-radius:999px;align-items:center;padding:0 13px;font-size:13px;font-weight:500;text-decoration:none;display:inline-flex}.research-library__toolbar{align-items:center;height:54px;padding:0 16px;display:flex}.research-library__toolbar nav span{min-height:30px;color:var(--app-ink);background:var(--app-surface-strong);border-radius:999px;align-items:center;padding:0 11px;font-size:13px;display:inline-flex}.research-library__content{min-height:calc(100dvh - 110px)}.text-link,.text-action{color:var(--app-ink);text-underline-offset:4px}.primary-action,.secondary-action{border:1px solid var(--app-border-strong);border-radius:999px;justify-content:center;align-items:center;min-height:36px;padding:0 14px;font-size:13px;font-weight:500;text-decoration:none;display:inline-flex}.primary-action{border-color:var(--app-ink);color:var(--app-canvas);background:var(--app-ink)}.secondary-action{color:var(--app-ink);background:var(--app-canvas)}.state-panel{border-top:1px solid var(--app-border);border-bottom:1px solid var(--app-border);background:0 0;margin:0;padding:16px 0}.state-panel h2{color:var(--app-ink);margin:0;font-size:15px;font-weight:500}.state-panel p{color:var(--app-muted);margin:7px 0 0;font-size:13px;line-height:1.55}.state-panel__action{min-height:36px;color:var(--app-ink);cursor:pointer;text-underline-offset:4px;background:0 0;border:0;margin-top:12px;padding:0;text-decoration:underline}.content-mark{border-top:1px solid var(--app-border);min-width:0;padding:14px 0}.content-mark__label{color:var(--app-muted);font-size:12px;font-weight:500}.content-mark p{color:var(--app-ink-soft);margin:8px 0 0;font-size:14px;line-height:1.6}.account-navigation{align-items:center;gap:10px;display:flex}.account-navigation a,.nav-action{color:var(--app-ink-soft);font-size:13px}.nav-action{background:0 0;border:0;min-height:36px;padding:0}@keyframes route-page-enter-forward{0%{transform:translateY(14px)}68%{transform:translateY(1px)}to{transform:translate(0,0)}}@keyframes route-page-enter-backward{0%{transform:translateY(-14px)}68%{transform:translateY(-1px)}to{transform:translate(0,0)}}@keyframes route-page-enter-lateral{0%{transform:translateY(8px)}to{transform:translate(0,0)}}.route-motion-surface[data-motion-active=true][data-motion-direction=forward]>*>main{animation:.222s cubic-bezier(.16,1,.3,1) both route-page-enter-forward}.route-motion-surface[data-motion-active=true][data-motion-direction=backward]>*>main{animation:.222s cubic-bezier(.16,1,.3,1) both route-page-enter-backward}.route-motion-surface[data-motion-active=true][data-motion-direction=lateral]>*>main{animation:.222s cubic-bezier(.16,1,.3,1) both route-page-enter-lateral}@keyframes loading-breathe{0%,to{opacity:.4}50%{opacity:1}}.fatal-error{width:min(680px,100% - 40px);color:var(--ink-strong,var(--lightningcss-light,#111)var(--lightningcss-dark,#e3e3e3));margin:15vh auto 0}.fatal-error h1,.not-found-state h1{letter-spacing:-.03em;margin:8px 0 0;font-size:clamp(28px,4vw,44px);font-weight:500}.fatal-error>p:not(.eyebrow),.not-found-state>p:not(.eyebrow){max-width:520px;color:var(--ink-soft,var(--lightningcss-light,#6f6f6f)var(--lightningcss-dark,#ababab));margin:14px 0 0;line-height:1.65}.fatal-error__actions,.not-found-state{flex-direction:column;align-items:flex-start;display:flex}.fatal-error__actions{gap:12px;margin-top:24px}.fatal-error__actions button,.fatal-error__actions a{border:1px solid var(--app-border-strong,var(--lightningcss-light,#cecece)var(--lightningcss-dark,#404040));min-height:36px;color:var(--app-ink,var(--lightningcss-light,#111)var(--lightningcss-dark,#e3e3e3));background:var(--app-canvas,var(--lightningcss-light,#fff)var(--lightningcss-dark,#212121));cursor:pointer;border-radius:999px;justify-content:center;align-items:center;padding:0 14px;text-decoration:none;display:inline-flex}.fatal-error__actions button{border-color:var(--app-ink,var(--lightningcss-light,#111)var(--lightningcss-dark,#9e9e9e));color:var(--app-canvas,var(--lightningcss-light,#fff)var(--lightningcss-dark,#212121));background:var(--app-ink,var(--lightningcss-light,#111)var(--lightningcss-dark,#e3e3e3))}.network-status-notice{z-index:85;border:1px solid var(--app-border-strong,var(--lightningcss-light,#cecece)var(--lightningcss-dark,#404040));max-width:min(460px,100vw - 32px);color:var(--app-ink-soft,var(--lightningcss-light,#303030)var(--lightningcss-dark,#c7c7c7));background:var(--app-canvas,var(--lightningcss-light,#fff)var(--lightningcss-dark,#212121));border-radius:9px;padding:9px 12px;font-size:12px;line-height:1.5;position:fixed;top:10px;right:14px;box-shadow:0 8px 24px #1111111a}.not-found-state{max-width:680px;padding:clamp(40px,10vw,96px) 0}.not-found-state .primary-action{margin-top:24px}@media (width<=760px){.app-frame{min-height:100dvh;padding:56px 0 66px;display:block}.app-frame__shader-canvas{opacity:.36}.app-frame--immersive{padding:0}.network-status-notice{max-width:none;top:62px;left:12px;right:12px}.desktop-rail{display:none}.masthead{z-index:30;border-bottom:1px solid var(--app-border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:var(--lightningcss-light,#fffffff5)var(--lightningcss-dark,#212121f5);justify-content:space-between;align-items:center;height:56px;padding:0 14px;display:flex;position:fixed;top:0;left:0;right:0}.masthead a,.masthead button,.account-navigation a,.account-navigation button{min-height:44px}.account-navigation{gap:10px}.wordmark{gap:7px}.product-mark{width:24px;height:24px}.product-mark img{width:23px;height:23px}.page-shell{width:min(100% - 28px,1080px);padding:20px 0 44px}.page-shell--wide,.page-shell--workspace,.page-shell--immersive{width:100%;padding:0}.page-shell--workspace{height:calc(100dvh - 122px)}.mobile-navigation{z-index:40;min-height:66px;padding:5px 6px max(5px, env(safe-area-inset-bottom));border-top:1px solid var(--app-border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:var(--lightningcss-light,#fffffff7)var(--lightningcss-dark,#212121f7);grid-template-columns:repeat(6,1fr);display:grid;position:fixed;bottom:0;left:0;right:0}.mobile-navigation a{color:var(--app-muted);border-radius:8px;place-items:center;gap:2px;font-size:10px;display:grid}.mobile-navigation__more{min-width:0;color:var(--app-muted);font:inherit;background:0 0;border:0;border-radius:8px;place-items:center;gap:2px;padding:0;font-size:10px;display:grid}.mobile-navigation__more[aria-expanded=true],.mobile-navigation a[aria-current=page]{color:var(--app-ink);background:var(--app-surface)}.mobile-navigation .navigation-icon{width:19px;height:19px}.mobile-more{z-index:39;position:fixed;inset:0}.mobile-more__backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:var(--lightningcss-light,#1111113d)var(--lightningcss-dark,#e3e3e33d);border:0;width:100%;padding:0;position:absolute;inset:0}.mobile-more__sheet{right:10px;bottom:calc(66px + env(safe-area-inset-bottom));border:1px solid var(--app-border);background:var(--lightningcss-light,#fffffffa)var(--lightningcss-dark,#212121fa);border-radius:16px;padding:10px;position:absolute;left:10px;box-shadow:0 20px 64px #11111138}.mobile-more__sheet>header{justify-content:space-between;align-items:center;min-height:44px;padding:0 4px 6px 12px;display:flex}.mobile-more__sheet>header>button{width:44px;height:44px;color:var(--app-ink);background:0 0;border:0;border-radius:10px;place-items:center;padding:0;display:grid}.mobile-more__sheet nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.mobile-more__sheet nav a{min-height:64px;color:var(--app-ink-soft);background:var(--app-surface-subtle);border-radius:12px;align-items:center;gap:10px;padding:0 14px;text-decoration:none;display:flex}.mobile-more__sheet nav a[aria-current=page]{color:var(--app-ink);background:var(--app-surface)}.research-library{min-height:calc(100dvh - 122px)}.research-library__header{height:52px;padding-inline:14px}.research-library__header>a{min-height:32px;padding-inline:11px}.research-library__toolbar{height:48px;padding-inline:12px}.page-shell button:not([aria-hidden=true]),.page-shell [role=button]:not([aria-hidden=true]){min-height:44px}.page-shell input:not([type=checkbox]):not([type=radio]):not([type=file]),.page-shell select,.page-shell textarea{min-height:44px;font-size:max(16px,1em)}.page-shell [role=dialog]{max-width:calc(100vw - 20px);max-height:calc(100dvh - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom));overflow:auto}}@media (prefers-reduced-motion:reduce){.route-motion-surface,.route-motion-surface>*>main{animation:none!important}*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.knowledge-navigation__toggle{width:100%;min-height:38px;color:var(--app-ink-soft);font:inherit;text-align:left;cursor:pointer;background:0 0;border:0;border-radius:8px;align-items:center;gap:10px;padding:0 10px;font-size:14px;display:flex}.knowledge-navigation__toggle:hover,.knowledge-navigation__toggle[data-active]{color:var(--app-ink);background:var(--lightningcss-light,#1e232012)var(--lightningcss-dark,#e2e4e312)}.knowledge-navigation__chevron{margin-left:auto;transform:rotate(-90deg)}.knowledge-navigation__toggle[aria-expanded=true] .knowledge-navigation__chevron{transform:rotate(0)}.knowledge-navigation__children{border-left:1px solid var(--app-border);margin:3px 0 6px 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