/* AIHub / Field notes — an independent editorial identity. */
:root{--paper:#f4f3e9;--ink:#202a25;--muted:#626960;--line:#cbd0c3;--blue:#214fb7;--pale:#e9ece0;--lime:#d2fa63;--font:"Avenir Next","PingFang SC","Microsoft YaHei",sans-serif;--serif:"Iowan Old Style","Baskerville","Songti SC",serif}
body.page-home{background:var(--paper);font-family:var(--font)}.page-home .wrap{max-width:1440px;padding:0 56px}.page-home .nav{height:84px;border-bottom:1px solid var(--ink)}.page-home .logo{font:700 25px var(--font);letter-spacing:-1px}.page-home .logo-mark{display:none}.page-home .logo span{font:8px var(--mono);letter-spacing:1px;margin-left:15px;color:var(--muted)}.page-home .nav-links{font-size:12px;gap:32px}.page-home .nav .company{border:0;border-left:1px solid var(--line);padding:0 0 0 28px}.hub-menu{display:none}.masthead{display:flex;align-items:flex-end;justify-content:space-between;padding:31px 0 29px;border-bottom:1px solid var(--ink);gap:30px}.masthead>span{font-size:clamp(76px,8.5vw,122px);font-weight:600;line-height:.8;letter-spacing:-9px;display:flex;align-items:center}.masthead-serif{font-family:var(--serif);font-weight:400;letter-spacing:-8px}.masthead-asterisk{font-size:67px;line-height:.6;letter-spacing:0;margin-left:22px;color:var(--blue);transition:transform .6s}.masthead:hover .masthead-asterisk{transform:rotate(90deg)}.masthead>div{font-size:12px;text-align:right;line-height:2;letter-spacing:.8px}.masthead small{font:8px var(--mono);letter-spacing:1px}.page-home .hero{padding:35px 0 37px;min-height:0;border:0}.page-home .hero-grid{grid-template-columns:1fr 1.14fr;gap:50px;align-items:stretch}.hero-editorial{padding:21px 0 8px;display:flex;flex-direction:column;align-items:flex-start}.page-home .eyebrow{font-size:10px;letter-spacing:1.2px;color:var(--muted)}.page-home .dot{width:6px;height:6px;background:var(--blue);box-shadow:none}.page-home .hero h1{font-size:clamp(45px,4.7vw,69px);font-weight:500;line-height:1.18;letter-spacing:-3px;margin:30px 0 24px}.page-home .hero h1 em{font-family:var(--serif);font-style:normal;color:var(--blue);font-weight:400;position:relative;display:inline-block}.page-home .hero h1 em:after{content:"";position:absolute;left:0;bottom:3px;right:0;background:var(--lime);height:10px;z-index:-1;transform:rotate(-1.6deg)}.page-home .hero-copy{font-size:13px;line-height:1.9;color:var(--muted);margin:0 0 29px}.page-home .search{height:59px;border:1px solid var(--ink);border-radius:0;background:transparent;box-shadow:none;padding:7px 7px 7px 15px;gap:12px;width:100%;max-width:465px;margin-top:auto}.page-home .search:focus-within{border-color:var(--blue);box-shadow:3px 3px 0 var(--lime)}.page-home .search input{font-size:12px;min-width:0;width:100%;color:var(--ink)}.page-home .search button{background:var(--ink);color:var(--lime);font-size:24px;width:43px;min-width:43px;height:43px;padding:0;border-radius:0;transition:background .25s,color .25s}.page-home .search button:hover{background:var(--blue);color:white}.quick-search{display:flex;flex-wrap:wrap;gap:15px;align-items:center;margin-top:15px;font-size:10px;color:var(--muted)}.quick-search a{text-decoration:underline;text-underline-offset:4px;color:var(--ink)}.editorial-visual{position:relative;min-width:0;display:flex;flex-direction:column}.photo-window{position:relative;overflow:hidden;background:#1f61a8;flex:1;min-height:485px}.hero-photo{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;object-position:50% 48%;transform:scale(1.08) translate3d(var(--photo-x,0px),var(--photo-y,0px),0);transition:transform 1.2s cubic-bezier(.16,1,.3,1);will-change:transform}.photo-window:after{content:"";position:absolute;inset:50% 0 0;background:linear-gradient(transparent,#092b5350);pointer-events:none}.photo-register{position:absolute;left:25px;top:24px;font:8px var(--mono);letter-spacing:1.5px;color:white}.photo-title{position:absolute;bottom:29px;left:30px;font-family:var(--serif);font-size:clamp(40px,4.3vw,61px);line-height:.97;letter-spacing:-2px;color:white;z-index:1}.photo-title em{font-weight:400}.crosshair{position:absolute;color:var(--lime);font:22px var(--mono);font-weight:200;z-index:1}.crosshair-a{right:23px;top:15px}.crosshair-b{left:22px;top:45%}.photo-caption{display:flex;justify-content:space-between;gap:20px;padding-top:13px;font-size:9px;color:var(--muted)}.photo-caption span:last-child{font:8px var(--mono);letter-spacing:1px;padding-top:3px}.explore-stamp{position:absolute;right:24px;bottom:53px;z-index:2;border-radius:50%;background:var(--lime);color:#203129;width:111px;height:111px;display:flex;align-items:center;justify-content:center;flex-direction:column;transform:rotate(10deg);transition:transform .45s,background .3s}.explore-stamp span{font-size:11px}.explore-stamp strong{font-size:37px;line-height:1.3;font-weight:400}.explore-stamp small{font:7px var(--mono);letter-spacing:1px}.explore-stamp:hover{transform:rotate(-8deg) scale(1.08);background:#e5ff9c}.discovery{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);padding:25px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:25px}.discovery-heading .kicker{font-size:8px}.discovery-heading h2{font-size:20px;font-weight:500;margin:5px 0 0}.discovery-tabs{display:flex;align-items:center;justify-content:flex-end;gap:8px}.discovery-tabs button{background:transparent;border:1px solid transparent;font-size:11px;padding:10px 13px}.discovery-tabs button[aria-selected=true]{border-color:var(--ink);background:var(--lime)}.discovery-tabs button:hover{border-color:var(--ink)}#discovery-panel{grid-column:1/-1;display:flex;align-items:center;gap:24px;border-top:1px solid var(--line);padding:24px 0;background:transparent}.discovery-symbol{font:45px var(--serif);color:var(--blue)}#discovery-panel h3{font-size:17px;font-weight:500;letter-spacing:-.4px;margin:0 0 8px}#discovery-panel p{font-size:11px;color:var(--muted);margin:0}#discovery-panel a{font-size:11px;white-space:nowrap;margin-left:auto;border-bottom:1px solid;padding-bottom:5px}.panel-enter{animation:panel-enter .4s ease-out}@keyframes panel-enter{from{transform:translateX(12px);opacity:.3}to{transform:none;opacity:1}}.page-home .ticker{display:none}.page-home .section{padding-top:88px}.page-home .section-head{margin-bottom:36px}.page-home .kicker{font-size:9px;letter-spacing:1.2px}.page-home .section h2{font-size:33px;font-weight:500;line-height:1.4}.section-en{font-family:var(--serif);font-style:italic;font-size:43px;color:var(--blue);margin-left:25px;letter-spacing:-1.5px}.page-home .subline{font-size:12px;line-height:1.9;max-width:380px}.page-home .catalog-control{border-bottom:1px solid var(--ink);padding-bottom:17px;margin-bottom:0}.page-home .filter{font-size:11px;padding:8px 14px}.page-home .filter[aria-pressed=true]{background:var(--ink);color:var(--lime)}.page-home .count{font-size:9px}.page-home .tools{display:block;counter-reset:entry}.page-home .tool{counter-increment:entry;display:grid;grid-template-columns:40px 1fr 1.2fr 210px;align-items:center;gap:16px 30px;padding:25px 10px;min-height:137px;background:transparent;border:0;border-bottom:1px solid var(--line);box-shadow:none;transition:background .3s,padding .3s,transform .3s}.page-home .tool:before{content:"0" counter(entry);font:10px var(--mono);color:var(--muted);grid-column:1;grid-row:1/4}.page-home .tool-top{grid-column:2;grid-row:1;justify-content:flex-start;gap:10px}.page-home .tool-symbol{width:auto;height:auto;font:14px var(--mono);background:transparent;color:var(--blue)}.page-home .tool-type{font-size:8px;border:0;padding:0;color:var(--muted)}.page-home .tool h3{grid-column:2;grid-row:2/4;font-size:22px;line-height:1.2;font-weight:500;margin:0;letter-spacing:-.5px}.page-home .tool p{grid-column:3;grid-row:1/3;font-size:11px;line-height:1.9;max-width:340px;margin:0;color:var(--muted)}.page-home .tags{grid-column:3;grid-row:3;margin:0;padding:0;font-size:9px}.page-home .tool-bottom{grid-column:4;grid-row:1/4;border:0;flex-direction:column;align-items:flex-end;gap:15px;padding:0;margin:0}.page-home .detail{font-size:12px;color:var(--ink);display:flex;gap:35px;align-items:center}.page-home .detail .arrow{font-size:24px;color:var(--blue);transition:transform .3s}.page-home .check{font-size:10px}.page-home .check input{width:15px;height:15px;accent-color:var(--blue)}.page-home .tool:hover,.page-home .tool:focus-within{background:#e9eddc;padding-left:22px;transform:none;box-shadow:none}.page-home .tool:hover .arrow{transform:rotate(45deg)}.page-home .tool:has(input:checked){background:#e4edcc}.page-home .catalog-foot{font-size:9px;padding-top:7px}.page-home .guides-grid{grid-template-columns:.92fr 1.08fr;gap:48px}.page-home .guide-feature{background:var(--blue);color:#fff;min-height:390px;padding:35px}.page-home .guide-feature .kicker{color:#dae5ff}.page-home .guide-feature h3{font-size:36px;line-height:1.4;max-width:330px}.page-home .guide-feature p{color:#d6e2ff;font-size:12px;max-width:290px}.page-home .guide-feature a{color:var(--lime);border-color:var(--lime);font-size:12px;margin-top:30px}.page-home .feature-shape{width:210px;height:210px;border:1px solid #adc7ee60;border-radius:50%;bottom:-65px;right:-65px;transition:transform .7s}.page-home .feature-shape:before,.page-home .feature-shape:after{border-radius:50%;border-color:#adc7ee60}.page-home .guide-feature:hover .feature-shape{transform:scale(1.3) rotate(40deg)}.page-home .guide summary{padding:26px 0}.page-home .guide h3{font-size:17px;line-height:1.6;font-weight:500}.page-home .guide-summary{font-size:10px}.page-home .guide-content{font-size:12px}.page-home .guide[open]{background:#ecefe2}.page-home .guide[open] summary{padding-left:12px;padding-right:12px}.page-home .method-line{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);padding:24px 0;margin-top:35px;display:flex;gap:30px;align-items:center;font-size:12px}.ml-label{margin-right:auto;color:var(--muted);font-size:10px}.ml-step{display:flex;gap:10px;align-items:center}.ml-step i{font:9px var(--mono);color:var(--blue)}.ml-arrow{color:var(--muted)}.page-home .principles{grid-template-columns:.85fr 1.5fr;gap:55px;margin-bottom:85px}.page-home .principles h2{font-size:29px}.page-home .principles h2 em{font-family:var(--serif);color:var(--blue);font-style:normal}.page-home .principle-items{gap:28px}.page-home .principle-items h3{font-size:14px}.page-home .principle-items p{font-size:11px}.page-home .disclosure{font-size:10px}.page-home .cta{background:var(--lime);color:var(--ink);padding:40px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.page-home .cta h2{font-size:31px;line-height:1.5}.page-home .cta p{color:#526439;font-size:12px}.page-home .cta a{background:var(--ink);color:var(--lime);font-size:11px;padding:15px 20px}.page-home .cta a:hover{background:var(--blue);color:white}.page-home .footer{padding:40px 0;font-size:9px}.page-home .footer strong{font:500 32px var(--serif);letter-spacing:-1px}.page-home .compare-bar{background:var(--ink)}.page-home .compare-bar button{background:var(--lime);color:var(--ink)}.page-home .compare-bar button.clear{background:transparent;color:white}.page-home .compare-bar button:disabled{background:#899378;color:#142212;cursor:default}.page-home dialog{background:var(--paper)}.page-home .comparison th{background:#e8edda}.page-home .reveal{transform:translateY(18px)}.page-home .reveal.visible{transform:none}
@media(max-width:1100px){.page-home .wrap{padding:0 32px}.page-home .hero-grid{gap:30px}.photo-window{min-height:460px}.page-home .hero h1{font-size:56px}.page-home .tool{grid-template-columns:25px 1fr 1fr 140px;gap:14px 20px}.page-home .tool h3{font-size:19px}.page-home .nav-links{gap:20px}.page-home .principles{gap:30px}.discovery-tabs button{padding:8px;font-size:10px}.page-home .guides-grid{gap:28px}}
@media(max-width:700px){.page-home .wrap{padding:0 20px}.page-home .nav{height:69px;position:relative}.page-home .logo{font-size:23px}.page-home .logo span{display:inline;font-size:7px;margin-left:7px}.hub-menu{display:block;border:1px solid var(--ink);background:transparent;padding:7px 12px;font-size:11px}.page-home .nav-links{display:none;position:absolute;top:69px;left:0;right:0;z-index:10;background:var(--paper);border:1px solid var(--ink);padding:16px}.page-home .nav-links.open{display:flex;flex-direction:column;align-items:stretch;gap:3px}.page-home .nav-links a,.page-home .nav-links a:nth-child(2),.page-home .nav-links a:nth-child(3){display:block;font-size:14px;padding:12px;border:0}.masthead{padding:25px 0 21px;align-items:center;gap:10px}.masthead>span{font-size:70px;letter-spacing:-5px}.masthead-serif{letter-spacing:-5px}.masthead-asterisk{font-size:39px;margin-left:11px}.masthead>div{font-size:8px;max-width:113px;letter-spacing:0;line-height:1.8}.masthead small{font-size:5px;letter-spacing:.3px;display:block;margin-top:4px}.page-home .hero{padding:24px 0 29px}.page-home .hero-grid{grid-template-columns:1fr;gap:27px}.hero-editorial{padding:0}.page-home .eyebrow{font-size:9px}.page-home .hero h1{font-size:52px;line-height:1.15;letter-spacing:-2px;margin:25px 0 20px}.page-home .hero h1 br:nth-of-type(2){display:none}.page-home .hero-copy{font-size:12px;margin-bottom:23px}.page-home .search{height:55px;max-width:none;padding:5px 5px 5px 12px}.page-home .search input{font-size:11px}.page-home .search button{height:43px;width:43px;min-width:43px}.quick-search{font-size:9px;gap:13px;margin-top:13px}.photo-window{min-height:360px}.photo-title{font-size:45px;left:24px;bottom:28px}.photo-register{font-size:7px;top:19px;left:22px}.explore-stamp{width:90px;height:90px;right:19px;bottom:50px}.explore-stamp strong{font-size:28px}.explore-stamp span{font-size:10px}.explore-stamp small{font-size:6px}.photo-caption{font-size:8px;gap:10px}.photo-caption span:last-child{font-size:6px}.discovery{display:block;padding-top:22px}.discovery-heading h2{font-size:22px}.discovery-tabs{justify-content:flex-start;margin:20px 0;gap:10px}.discovery-tabs button{font-size:10px;padding:8px 11px}#discovery-panel{flex-wrap:wrap;gap:12px;padding:20px 0}#discovery-panel>div{flex:1}#discovery-panel h3{font-size:15px;line-height:1.65}#discovery-panel p{font-size:10px;line-height:1.9}#discovery-panel a{margin:6px 0 0 37px;font-size:11px}.discovery-symbol{font-size:30px}.page-home .section{padding-top:62px}.page-home .section-head{display:block;margin-bottom:25px}.page-home .section h2{font-size:28px}.section-en{font-size:34px;margin-left:15px}.page-home .subline{max-width:none;font-size:11px;margin-top:15px;padding:0}.page-home .catalog-control{gap:13px}.page-home .filters{gap:0}.page-home .filter{font-size:10px;padding:7px 10px}.page-home .tool{grid-template-columns:22px 1fr;gap:12px 14px;padding:22px 0;min-height:0}.page-home .tool:before{grid-row:1/3;align-self:start;padding-top:3px}.page-home .tool-top{grid-column:2;grid-row:1;gap:12px}.page-home .tool h3{grid-column:2;grid-row:2;font-size:23px}.page-home .tool p{grid-column:2;grid-row:3;font-size:12px;max-width:none}.page-home .tags{grid-column:2;grid-row:4;font-size:9px}.page-home .tool-bottom{grid-column:2;grid-row:5;flex-direction:row;align-items:center;gap:15px;padding-top:8px}.page-home .detail{font-size:11px;gap:15px}.page-home .check{font-size:10px}.page-home .tool:hover,.page-home .tool:focus-within{padding-left:8px}.page-home .catalog-foot{font-size:8px;gap:18px}.page-home .catalog-foot p:last-child{max-width:140px}.page-home .guides-grid{grid-template-columns:1fr;gap:25px}.page-home .guide-feature{min-height:350px;padding:28px}.page-home .guide-feature h3{font-size:33px}.page-home .guide h3{font-size:16px}.page-home .method-line{gap:16px;flex-wrap:wrap;justify-content:space-between;font-size:11px}.ml-label{flex-basis:100%;font-size:10px}.ml-arrow{display:none}.ml-step{gap:7px}.page-home .principles{grid-template-columns:1fr;gap:25px;margin-bottom:50px}.page-home .principle-items{grid-template-columns:1fr;gap:22px}.page-home .principle-items>div:not(.disclosure){display:grid;grid-template-columns:40px 1fr;gap:8px}.page-home .principle-items h3{margin:0;font-size:15px}.page-home .principle-items .num{padding-top:5px}.page-home .principle-items p{grid-column:2;font-size:12px}.page-home .disclosure{font-size:10px}.page-home .cta{padding:27px 23px}.page-home .cta h2{font-size:27px}.page-home .cta p{font-size:11px}.page-home .cta a{font-size:10px;padding:13px 15px}.page-home .footer{padding:30px 0;font-size:8px}.page-home .footer strong{font-size:27px}.page-home .footer-links{gap:18px;font-size:9px}}
@media(max-width:370px){.page-home .hero h1{font-size:46px}.masthead>span{font-size:60px}.masthead-asterisk{font-size:30px}.page-home .filter{padding:7px 8px}.page-home .check{font-size:9px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.hero-photo{transform:none;will-change:auto}.page-home [data-reveal]{opacity:1!important;transform:none!important}}
/* Reset obsolete home-card decoration before numbering the editorial index. */
.page-home .tool:before{position:static;inset:auto;height:auto;width:auto;background:none;transform:none;transition:none}.page-home .tool:hover:before{transform:none}.page-home .cta:after{display:none}
@media(max-width:700px){.page-home .hero h1{font-size:37px;letter-spacing:-1.8px;margin:20px 0 18px;line-height:1.27}.page-home .hero h1 em{display:inline}.page-home .hero h1 em:after{height:6px;bottom:1px}.page-home .hero-copy{margin-bottom:20px}.photo-window{min-height:325px}.page-home .hero-grid{gap:23px}}

/* Fixed vector geometry: never use system emoji fonts for arrows. */
.ui-arrow{display:inline-block;width:1.05em;height:1.05em;flex-shrink:0;vertical-align:-.14em;overflow:visible;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.ui-arrow path{fill:none;stroke:currentColor;stroke-width:1.5}.footer-contact{text-align:center;padding:20px 20px 0;font-size:12px;overflow-wrap:anywhere}.footer-contact a{color:inherit;text-decoration:none}.footer-contact a:hover{text-decoration:underline;text-underline-offset:4px}.foot-links .ui-arrow,.footer-links .ui-arrow,.navlinks .ui-arrow,.nav-links .ui-arrow{width:13px;height:13px}.hero-discover .ui-arrow{width:19px;height:19px}.explore-stamp strong .ui-arrow{width:38px;height:38px}.discovery-symbol .ui-arrow{width:42px;height:42px}.hero-signature .ui-arrow{width:14px;height:14px}
.page-home .search button .ui-arrow{color:inherit;width:24px;height:24px;display:block;margin:auto}
