:root{--fh-paper:#f7f9ff;--fh-surface:#fff;--fh-sunken:#edf1fb;--fh-line:#dfe5f3;--fh-line-strong:#7180a8;--fh-ink:#0d245f;--fh-navy:#0b1f57;--fh-body:#33426b;--fh-muted:#57668e;--fh-muted-2:#a7b1cc;--fh-accent:#3a7af8;--fh-accent-ink:#1954c8;--fh-accent-hover:#1446a8;--fh-tint:#ebf1fe;--fh-ask:#dbe5fd;--fh-focus:#1d66f7;--fh-warn:#8f600d;--fh-warn-bg:#fdf1dd;--fh-good:#0e6b37;--fh-good-bg:#e7f5ec;--fh-grad:linear-gradient(135deg, #18b7e8 0%, #3a7af8 48%, #7263ff 100%);--fh-grad-ink:linear-gradient(135deg, #057cb6 0%, #336dee 48%, #6e5cf9 100%);--fh-lit-1:var(--color-lit-1);--fh-lit-2:var(--color-lit-2);--fh-lit-3:var(--color-lit-3);--fh-ease-out:var(--ease-out);--fh-rise-dur:.56s;--fh-rise-shift:14px;--fh-stagger:70ms;--fh-sweep-dur:1.1s;--fh-font:var(--font-sans);--fh-mono:var(--font-mono);--fh-measure:62ch;--fh-gutter:clamp(20px, 5vw, 56px);--fh-radius:10px;--fh-radius-card:14px;--fh-radius-control:9px;--fh-fs-h1:clamp(2.1rem, 1.2rem + 3.2vw, 3.4rem);--fh-fs-h2:clamp(1.5rem, 1.05rem + 1.3vw, 2rem)}.fh-shell{background:var(--fh-paper);color:var(--fh-ink);font-family:var(--fh-font);font-size:16px;line-height:1.55}.fh-shell :where(h1,h2,h3,h4){letter-spacing:normal;margin:0;font-weight:600}.fh-shell :where(p,ul,ol){margin:0}.fh-h1{font-size:var(--fh-fs-h1);letter-spacing:-.03em;text-wrap:balance;font-weight:700;line-height:1.05}.fh-h2{font-size:var(--fh-fs-h2);letter-spacing:-.02em;text-wrap:balance;font-weight:650;line-height:1.14}.fh-h3{letter-spacing:-.01em;text-wrap:balance;font-size:17px;font-weight:600;line-height:1.3}.fh-shell a:not(.fh-btn){color:var(--fh-accent-ink);text-decoration:none}.fh-shell a:not(.fh-btn):hover{color:var(--fh-accent-hover);text-decoration:underline}.fh-shell :focus-visible{outline:2px solid 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20px;font-size:15px;font-weight:600;text-decoration:none;display:inline-flex}.fh-btn--solid{background-color:var(--fh-accent-ink);background-image:var(--fh-grad-ink);color:#fff}.fh-btn--solid:hover{background-image:linear-gradient(#0b1f5724, #0b1f5724), var(--fh-grad-ink);color:#fff;text-decoration:none}.fh-btn--solid:active{background-image:linear-gradient(#0b1f573d, #0b1f573d), var(--fh-grad-ink);color:#fff;text-decoration:none}.fh-btn--solid:visited{color:#fff}.fh-btn--outline{background:var(--fh-surface);color:var(--fh-ink);border:1px solid var(--fh-line-strong)}.fh-btn--outline:hover{background:var(--fh-sunken);color:var(--fh-ink);text-decoration:none}.fh-btn--outline:visited{color:var(--fh-ink)}.fh-btn--sm{height:38px;padding:0 14px;font-size:14px}.fh-brand{flex:none;align-items:center;display:inline-flex}.fh-brand img{display:block}.fh-header{z-index:5;-webkit-backdrop-filter:saturate(1.2)blur(10px);backdrop-filter:saturate(1.2)blur(10px);border-bottom:1px solid var(--fh-line);background:#f7f9ffdb;position:sticky;top:0}.fh-header-inner{justify-content:space-between;align-items:center;gap:16px;height:60px;display:flex}.fh-nav{flex:none;align-items:center;gap:22px;display:flex}.fh-slot{white-space:nowrap;justify-items:center;display:inline-grid}.fh-slot>*{grid-area:1/1}.fh-slot-ghost{visibility:hidden}.fh-nav>.fh-slot:first-child{justify-items:end}.fh-nav>.fh-slot:last-child{justify-items:start}.fh-navlink{color:var(--fh-body)}.fh-header a.fh-navlink{color:var(--fh-body);font-size:14.5px;font-weight:500}.fh-header a.fh-navlink:hover{color:var(--fh-ink);text-underline-offset:6px;text-decoration:underline;text-decoration-thickness:1px}.fh-header-end{flex:none;align-items:center;gap:16px;display:flex}.fh-header-cta-short{display:none}.fh-lang{flex:none;display:inline-flex;position:relative}.fh-lang-button{border:1px solid var(--fh-line);border-radius:var(--fh-radius-control);height:38px;color:var(--fh-body);font:inherit;cursor:pointer;background:0 0;align-items:center;gap:6px;padding:0 10px;font-size:14px;font-weight:500;line-height:1;display:inline-flex}.fh-lang-button:hover,.fh-lang-button[aria-expanded=true]{background:var(--fh-sunken);color:var(--fh-ink)}.fh-lang-button[aria-expanded=true]{border-color:var(--fh-line-strong)}.fh-lang-button[aria-busy=true]{cursor:progress}.fh-lang-button:focus-visible{border-radius:var(--fh-radius-control)}.fh-lang-icon{flex:none;width:16px;height:16px}.fh-lang-menu{background:var(--fh-surface);border:1px solid var(--fh-line-strong);border-radius:var(--fh-radius);width:max-content;min-width:160px;padding:4px;list-style:none;position:absolute;top:calc(100% + 6px);right:0}.fh-header a.fh-lang-link{min-height:40px;color:var(--fh-body);white-space:nowrap;border-radius:6px;justify-content:space-between;align-items:center;gap:16px;padding:0 10px 0 12px;font-size:14.5px;font-weight:500;display:flex}.fh-header a.fh-lang-link:hover{background:var(--fh-sunken);color:var(--fh-ink);text-decoration:none}.fh-header a.fh-lang-link[aria-current=true]{color:var(--fh-ink);font-weight:650}.fh-lang-link:focus-visible{outline-offset:-2px;border-radius:6px}.fh-lang-check{width:16px;height:16px;color:var(--fh-accent);flex:none}@media (scripting:none){.fh-lang:hover>.fh-lang-menu,.fh-lang:focus-within>.fh-lang-menu{display:block}.fh-lang-menu:before{content:"";height:8px;position:absolute;inset:-8px 0 auto}}@media (max-width:999px){.fh-nav{display:none}}@media (max-width:639px){.fh-header-cta-full{display:none}.fh-header-cta-short{display:inline-grid}}@media (max-width:560px){.fh-navlink--login{display:none}.fh-header-inner{gap:12px}.fh-header-end{gap:8px}.fh-brand img{width:auto;height:24px}.fh-header-cta{padding:0 10px;font-size:13px}.fh-lang-button{gap:5px;padding:0 8px;font-size:13px}}@media (max-width:339px){.fh-brand img{height:20px}}.fh-hero{padding-block:clamp(48px,8vw,96px) 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0;border:0;outline:0;flex:1;font-size:15px}.fh-url-input::placeholder{color:var(--fh-muted-2)}.fh-url-field:focus-within{border-color:var(--fh-accent-ink);outline:1px solid var(--fh-accent-ink);outline-offset:0}.fh-shell .fh-url-input:focus-visible{outline:0}.fh-url-prefix{color:var(--fh-muted);margin-right:6px;font-weight:500}.fh-stage{position:relative}.fh-stage:before,.fh-stage:after{content:"";pointer-events:none;z-index:0;position:absolute;inset:-28% -32% -24% -8%}.fh-stage:before{background:radial-gradient(28% 22% at 72% 22%,#3a7af824,#3a7af80d 55%,#3a7af800 100%),radial-gradient(30% 16% at 50% 16%,#18b7e817,#18b7e808 55%,#18b7e800 100%)}.fh-stage:after{background:radial-gradient(20% 30% at 80% 48%,#7263ff1a,#7263ff09 55%,#7263ff00 100%)}.fh-stage-inner{z-index:1;flex-direction:column;gap:10px;display:flex;position:relative}.fh-answer{background:var(--fh-surface);border:1px solid var(--fh-line);border-radius:var(--fh-radius-card);overflow:hidden}.fh-answer-head{border-bottom:1px solid var(--fh-line);background:var(--fh-paper);align-items:center;gap:10px;padding:12px 14px;display:flex}.fh-avatar{background:var(--fh-grad);-webkit-user-select:none;user-select:none;border-radius:9999px;flex:none;justify-content:center;align-items:center;width:36px;height:36px;display:flex;position:relative;overflow:hidden}.fh-avatar svg{width:62%;height:auto;overflow:visible}.fh-avatar svg path{stroke:#fff}.fh-avatar svg circle{fill:#fff}.fh-ident{flex:1;min-width:0}.fh-ident-name{min-width:0;color:var(--fh-ink);align-items:center;gap:7px;font-size:16px;font-weight:600;line-height:1.2;display:flex}.fh-ai{letter-spacing:.06em;color:var(--fh-accent-ink);background:var(--fh-tint);border-radius:4px;flex:none;padding:3px 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var(--fh-warn)}.fh-turn-a-slot{align-self:flex-start;max-width:94%;position:relative}.fh-turn-a-slot>.fh-turn-a{max-width:none}.fh-typing{background:var(--fh-sunken);pointer-events:none;border-radius:12px 12px 12px 4px;align-items:center;gap:5px;padding:13px 14px;display:none;position:absolute;top:0;left:0}.fh-typing-dot{background:var(--fh-muted);border-radius:999px;width:6px;height:6px;display:block}.fh-cites{color:var(--fh-muted);flex-wrap:wrap;align-items:center;gap:6px;font-size:12px;display:flex}.fh-cites-label{color:var(--fh-muted);font-weight:600}.fh-cite{border:1px solid var(--fh-line);background:var(--fh-surface);text-overflow:ellipsis;white-space:nowrap;border-radius:9999px;max-width:100%;padding:4px 10px;font-size:12px;line-height:1.4;display:inline-block;overflow:hidden}.fh-shell a.fh-cite:hover{border-color:var(--fh-accent);text-decoration:none}.fh-answer-sig{justify-content:space-between;align-items:baseline;gap:8px;display:flex}.fh-answer-note{color:var(--fh-muted);font-size:13.5px}@media (max-width:900px){.fh-hero-inner{grid-template-columns:minmax(0,1fr)}.fh-stage:before,.fh-stage:after{inset:-14% -12% -10%}}@media (max-width:520px){.fh-urlform{flex-direction:column}.fh-url-field{flex:none}.fh-urlform .fh-btn{width:100%}.fh-answer-head{padding:10px 12px}.fh-turns{padding:12px}.fh-turn-q{max-width:94%}.fh-answer-sig{flex-direction:column;gap:2px}}.fh-works{background:var(--fh-surface);border-top:1px solid var(--fh-line);border-bottom:1px solid var(--fh-line)}.fh-works-inner{flex-direction:column;align-items:center;gap:12px;padding-block:22px;display:flex}.fh-works-label{text-align:center;text-wrap:balance;color:var(--fh-body);font-size:15px;font-style:italic;font-weight:400;line-height:1.5}.fh-works-list{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px 30px;margin:0;padding:0;list-style:none;display:flex}.fh-works-item{color:var(--fh-muted);white-space:nowrap;align-items:center;gap:8px;font-size:15px;font-weight:600;display:inline-flex}.fh-works-item svg{fill:currentColor;flex:none;margin-block:-7px}@media (max-width:520px){.fh-works-list{gap:10px 22px}}.fh-section{padding-block:clamp(48px,7vw,88px)}.fh-section--surface{background:var(--fh-surface);border-top:1px solid var(--fh-line);border-bottom:1px solid var(--fh-line)}.fh-sec-head{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);align-items:start;gap:16px 48px;margin-bottom:32px;display:grid}.fh-sec-head 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16px;display:grid}.fh-snippet-code{font-family:var(--fh-mono);color:var(--fh-ink);white-space:nowrap;font-size:13px;display:block;overflow-x:auto}.fh-snippet-key{color:var(--fh-accent-ink);font-weight:600}.fh-verified{margin-top:12px}@media (max-width:760px){.fh-steps,.fh-snippet{grid-template-columns:minmax(0,1fr)}}@media (max-width:900px){.fh-steps{row-gap:32px}}.fh-section--connect{overflow-x:clip}.fh-connect{grid-template:"head orbit""list orbit""sync orbit"1fr/minmax(0,1fr) minmax(0,1fr);column-gap:64px;display:grid}.fh-connect-head{grid-area:head;gap:12px;margin-bottom:26px;display:grid}.fh-connect-head .fh-lead{font-size:16.5px}.fh-sources{grid-area:list;margin:0;padding:0;list-style:none}.fh-source{border-top:1px solid var(--fh-line);grid-template-columns:44px minmax(0,1fr);gap:14px;padding-block:14px;display:grid}.fh-source:last-child{border-bottom:1px solid var(--fh-line)}.fh-source-icon{border:1px solid 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12px;display:inline-flex}.fh-orbit-label{color:var(--fh-ink);font-size:14px;font-weight:600}.fh-orbit-tag{white-space:nowrap;background:var(--fh-surface);color:var(--fh-body);border-radius:999px;align-items:center;gap:7px;padding:5px 11px 5px 9px;font-size:13.5px;line-height:1.3;display:inline-flex}.fh-orbit-tag:before{content:"";background:var(--fh-accent);border-radius:50%;width:6px;height:6px}.fh-orbit-pause{border:1px solid var(--fh-line-strong);background:var(--fh-surface);width:32px;height:32px;color:var(--fh-ink);cursor:pointer;border-radius:50%;justify-content:center;align-items:center;padding:0;display:none;position:absolute;bottom:0;right:0}.fh-orbit-pause:hover{background:var(--fh-tint)}@media (max-width:900px){.fh-connect{grid-template-rows:none;grid-template-columns:minmax(0,1fr);grid-template-areas:"head""orbit""list""sync"}.fh-orbit-wrap{width:min(100%,420px);margin-bottom:36px}}@media 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span{font-size:13px}.proof .quiet,.proof .hint{color:var(--fh-muted);font-size:13px}.tip{--fh-tip-edge:16px;background:var(--fh-surface);color:var(--fh-ink);border:1px solid var(--fh-line);filter:drop-shadow(0 6px 14px #0d245f24);border-radius:12px;padding:8px 12px;font-size:13px;font-weight:500;line-height:1.4}.tip:after{content:"";background:var(--fh-surface);border-right:1px solid var(--fh-line);border-bottom:1px solid var(--fh-line);width:12px;height:12px;position:absolute;bottom:-7px;right:21px;transform:rotate(45deg)}.tip:hover{color:var(--fh-accent-ink)}@media (max-width:760px){.proofs{grid-template-columns:minmax(0,1fr)}}@media (max-width:640px){.tip{--fh-tip-edge:12px}}@media (max-width:560px){.tip{display:none}}