/* AISL main.min */
@font-face{font-family:"Switzer";font-style:normal;font-weight:400;font-display:optional;src:url("../fonts/switzer-400.woff2") format("woff2");}@font-face{font-family:"Switzer";font-style:normal;font-weight:600 700;font-display:optional;src:url("../fonts/switzer-600.woff2") format("woff2");}:root{--ink:#0a0a0a;--ink-soft:#3a3a3a;--paper:#ffffff;--paper-2:#f6f6f6;--line:#e6e6e6;--accent:#0a0a0a;--accent-2:#2e2e2e;--muted:#6a6a6a;--faint:#9a9a9a;--white:#ffffff;--radius:2px;--radius-md:4px;--font-display:"Switzer","PingFang TC","Hiragino Sans GB","Microsoft JhengHei","Noto Sans TC",system-ui,sans-serif;--font-body:"PingFang TC","Hiragino Sans GB","Microsoft JhengHei","Noto Sans TC","Switzer",system-ui,sans-serif;--font-serif:var(--font-display);--font-sans:var(--font-body);--text-xs:0.6875rem;--text-sm:0.8125rem;--text-base:1rem;--text-md:1.0625rem;--text-lg:1.125rem;--text-xl:clamp(1.35rem,2.2vw,1.7rem);--text-2xl:clamp(1.65rem,3vw,2.25rem);--text-3xl:clamp(2rem,4.2vw,3rem);--text-4xl:clamp(2.5rem,5.5vw,4.5rem);--leading-tight:1.08;--leading-snug:1.32;--leading-body:1.7;--tracking-display:-0.035em;--tracking-tight:-0.02em;--tracking-label:0.14em;--ease:cubic-bezier(0.22,1,0.36,1);--duration-fast:160ms;--duration:320ms;--duration-slow:560ms;--transition:var(--duration) var(--ease);--transition-fast:var(--duration-fast) var(--ease);--transition-slow:var(--duration-slow) var(--ease);--space-section:clamp(4.5rem,9vw,7.5rem);--wrap:min(1080px,calc(100% - 3rem));--shadow-sm:0 1px 2px rgba(0,0,0,0.04);--shadow-md:0 8px 28px rgba(0,0,0,0.08);--color-text:var(--ink);--color-text-muted:var(--muted);--color-text-faint:var(--faint);--color-bg:var(--paper);--color-surface:var(--paper-2);--color-surface-2:#efefef;--color-border:var(--line);--content-default:1080px;color-scheme:light;}[data-theme="dark"]{--ink:#f2f2f2;--ink-soft:#c8c8c8;--paper:#080808;--paper-2:#111111;--line:#262626;--accent:#f2f2f2;--accent-2:#c8c8c8;--muted:#8e8e8e;--faint:#6a6a6a;--white:#111111;--color-surface-2:#1a1a1a;--shadow-sm:0 1px 2px rgba(0,0,0,0.35);--shadow-md:0 10px 32px rgba(0,0,0,0.45);color-scheme:dark;}*,*::before,*::after{box-sizing:border-box;}html{scroll-behavior:smooth;}body{margin:0;font-family:var(--font-body);font-size:var(--text-base);font-weight:400;color:var(--ink);background:var(--paper);line-height:var(--leading-body);letter-spacing:0.01em;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;transition:background-color var(--transition),color var(--transition);}img{max-width:100%;height:auto;display:block;}h1,h2,h3,h4{font-family:var(--font-display);font-weight:500;letter-spacing:var(--tracking-display);line-height:var(--leading-snug);color:var(--ink);text-wrap:balance;}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:0.2em;transition:color var(--transition-fast);}a:hover{color:var(--accent-2);}.wrap{width:var(--wrap);margin-inline:auto;}.wrap--article{width:min(1120px,calc(100% - 2rem));}.skip-link{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--white);padding:0.5rem 1rem;z-index:1000;}.skip-link:focus{left:1rem;top:1rem;}.site-header{position:sticky;top:0;z-index:50;backdrop-filter:blur(18px) saturate(1.2);-webkit-backdrop-filter:blur(18px) saturate(1.2);background:color-mix(in srgb,var(--paper) 88%,transparent);border-bottom:1px solid var(--line);transition:background-color var(--transition),border-color var(--transition);}.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:4.25rem;}.brand{display:inline-flex;flex-direction:row;align-items:center;gap:0.75rem;text-decoration:none;color:inherit;transition:opacity var(--transition-fast);}.brand:hover{opacity:0.72;color:inherit;}.brand picture{display:contents;}.brand__wordmark{display:block;height:1.5rem;width:auto;}.brand__mark{flex:0 0 auto;}.brand__copy{display:flex;flex-direction:column;gap:0.08rem;}.brand__name{font-family:var(--font-display);font-weight:600;font-size:0.98rem;letter-spacing:-0.02em;line-height:1.1;}.brand__tag{font-family:var(--font-body);font-size:0.62rem;font-weight:500;color:var(--muted);letter-spacing:var(--tracking-label);text-transform:uppercase;}[data-theme="dark"] .brand__wordmark,[data-theme="dark"] .footer-brand__wordmark{filter:invert(1);}.nav-wrap{display:flex;align-items:center;gap:1rem;}.site-nav{display:flex;flex-wrap:wrap;gap:0.85rem 1.2rem;align-items:center;}.site-nav a{position:relative;color:var(--ink-soft);text-decoration:none;font-family:var(--font-body);font-weight:500;font-size:var(--text-sm);letter-spacing:0.01em;padding:0.2rem 0;transition:color var(--transition-fast);}.site-nav a::after{content:"";position:absolute;left:0;right:0;bottom:-0.15rem;height:1px;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform var(--transition);}.site-nav a:hover::after,.site-nav a[aria-current="page"]::after{transform:scaleX(1);}.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--ink);}.nav-toggle{display:none;border:1px solid var(--line);background:var(--white);padding:0.45rem 0.75rem;border-radius:var(--radius);font:inherit;transition:border-color var(--transition-fast),color var(--transition-fast);}.btn{display:inline-flex;align-items:center;justify-content:center;gap:0.4rem;padding:0.72rem 1.2rem;border-radius:var(--radius);font-family:var(--font-body);font-size:var(--text-sm);font-weight:500;letter-spacing:0.02em;text-decoration:none;border:1px solid transparent;transition:transform var(--transition),background-color var(--transition),color var(--transition),border-color var(--transition),box-shadow var(--transition);}.btn:hover{transform:translateY(-1px);}.btn--primary{background:var(--ink);color:var(--white);border-color:var(--ink);}.btn--primary:hover{background:var(--accent-2);border-color:var(--accent-2);color:var(--white);}.btn--ghost{background:transparent;border-color:var(--ink);color:var(--ink);}.btn--ghost:hover{background:var(--ink);color:var(--white);}.btn--accent{background:var(--accent-2);color:var(--white);}.btn--nav{padding:0.4rem 0.75rem;font-size:0.75rem;font-weight:500;letter-spacing:0.02em;line-height:1.2;}.btn--nav:hover{transform:none;}.hero{position:relative;min-height:min(92vh,860px);display:flex;align-items:flex-end;overflow:hidden;border-bottom:1px solid var(--line);padding:0;background:radial-gradient(120% 80% at 12% 18%,color-mix(in srgb,var(--ink) 5%,transparent) 0%,transparent 55%),radial-gradient(90% 70% at 88% 72%,color-mix(in srgb,var(--ink) 4%,transparent) 0%,transparent 50%),linear-gradient(165deg,#fbfbfb 0%,var(--paper) 42%,#f3f3f3 100%);}.hero-atmosphere{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden;}.hero-atmosphere__wash{position:absolute;inset:-10%;background:radial-gradient(ellipse 55% 45% at 70% 30%,color-mix(in srgb,var(--ink) 7%,transparent),transparent 70%),radial-gradient(ellipse 40% 35% at 20% 80%,color-mix(in srgb,var(--ink) 4%,transparent),transparent 70%);animation:heroWash 14s var(--ease) infinite alternate;}.hero-atmosphere__beam{position:absolute;top:-20%;right:-8%;width:min(58vw,720px);height:140%;background:linear-gradient( 118deg,transparent 0%,color-mix(in srgb,var(--ink) 3.5%,transparent) 42%,transparent 68% );transform-origin:top right;animation:heroBeam 18s var(--ease) infinite alternate;}.hero-atmosphere__mark{position:absolute;right:clamp(-2rem,-1vw,0);bottom:clamp(-1.5rem,-1vw,0);font-family:var(--font-display);font-size:clamp(7rem,22vw,16rem);font-weight:500;letter-spacing:-0.06em;line-height:0.8;color:color-mix(in srgb,var(--ink) 5.5%,transparent);user-select:none;animation:heroMark 1.2s var(--ease) both;}.hero-stage{position:relative;z-index:1;width:var(--wrap);margin-inline:auto;padding-block:clamp(6.5rem,14vw,9.5rem) clamp(4rem,8vw,5.5rem);max-width:44rem;color:var(--ink);}.hero-brand{margin:0 0 1.35rem;font-family:var(--font-display);font-size:clamp(1.35rem,2.4vw,1.85rem);font-weight:600;letter-spacing:-0.03em;line-height:1.1;color:var(--ink);animation:heroRise 0.9s var(--ease) both;}.hero-brand::after{content:"";display:block;width:2.75rem;height:1px;margin-top:1.1rem;background:var(--ink);transform-origin:left center;animation:heroRule 1s var(--ease) 0.25s both;}.hero-headline{font-family:var(--font-display);font-size:clamp(2.35rem,5.2vw,4.25rem);font-weight:400;letter-spacing:var(--tracking-display);line-height:1.08;margin:0 0 1.5rem;color:var(--ink);max-width:min(100%,28rem);text-wrap:pretty;animation:heroRise 0.95s var(--ease) 0.08s both;}.hero-sub{font-family:var(--font-body);font-size:clamp(1.02rem,1rem + 0.4vw,1.2rem);font-weight:400;color:var(--muted);line-height:1.7;letter-spacing:0.01em;max-width:34rem;margin:0 0 2.1rem;animation:heroRise 1s var(--ease) 0.16s both;}.hero-cta{display:flex;gap:0.75rem;flex-wrap:wrap;margin-bottom:2.75rem;animation:heroRise 1.05s var(--ease) 0.24s both;}.hero-cta .btn-lg{padding:0.9rem 1.35rem;font-size:var(--text-sm);}.hero-engines{display:flex;align-items:center;gap:0.85rem 1.25rem;flex-wrap:wrap;padding-top:1.35rem;border-top:1px solid var(--line);animation:heroRise 1.1s var(--ease) 0.32s both;}.hero-engines__label{font-family:var(--font-body);font-size:var(--text-xs);font-weight:500;color:var(--faint);letter-spacing:var(--tracking-label);text-transform:uppercase;flex-shrink:0;}.hero-engines__list{display:flex;flex-wrap:wrap;align-items:center;gap:.55rem .85rem;margin:0;padding:0;list-style:none;}.hero-engines__list li{font-family:var(--font-body);font-size:var(--text-sm);font-weight:500;color:var(--ink-soft);letter-spacing:0.01em;}.hero-engines__list li:not(:last-child)::after{content:none;}.hero-engines__item{display:inline-flex;align-items:center;gap:.4rem;white-space:nowrap;}.hero-engines__logo{display:inline-grid;place-items:center;width:1.05rem;height:1.05rem;color:currentColor;opacity:.78;}.hero-engines__logo svg{display:block;width:100%;height:100%;}@keyframes heroRise{from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:none;}}@keyframes heroRule{from{transform:scaleX(0);opacity:0;}to{transform:scaleX(1);opacity:1;}}@keyframes heroMark{from{opacity:0;transform:translateY(24px);}to{opacity:1;transform:none;}}@keyframes heroWash{from{transform:translate3d(0,0,0) scale(1);}to{transform:translate3d(-1.5%,1%,0) scale(1.03);}}@keyframes heroBeam{from{opacity:0.7;transform:rotate(0deg) translate3d(0,0,0);}to{opacity:1;transform:rotate(-2deg) translate3d(-1%,1%,0);}}[data-theme="dark"] .hero{background:radial-gradient(120% 80% at 12% 18%,color-mix(in srgb,var(--paper) 12%,transparent) 0%,transparent 55%),radial-gradient(90% 70% at 88% 72%,color-mix(in srgb,var(--paper) 8%,transparent) 0%,transparent 50%),linear-gradient(165deg,#0c0c0c 0%,var(--paper) 45%,#101010 100%);}@keyframes rise{from{opacity:0;transform:translateY(16px);}to{opacity:1;transform:none;}}.section{position:relative;padding:var(--space-section) 0;}.section--soft{background:var(--paper-2);border-block:1px solid var(--line);}.section__eyebrow{margin:0 0 0.55rem;font-family:var(--font-body);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;color:var(--muted);font-weight:500;}.section__head{max-width:40rem;margin-bottom:2rem;}.section__head h2{font-family:var(--font-display);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-snug);letter-spacing:var(--tracking-display);margin:0 0 0.75rem;}.section__lead{margin:0;color:var(--muted);font-size:var(--text-md);line-height:var(--leading-body);}.answer{border-left:3px solid var(--accent);padding:0.85rem 1rem;margin:0 0 1.5rem;background:var(--paper-2);font-size:1.05rem;}.def-box{border:1px solid var(--line);background:var(--white);padding:1.25rem 1.4rem;border-radius:var(--radius);margin:1.25rem 0;}.def-box strong{display:block;margin-bottom:0.35rem;font-family:var(--font-display);font-weight:500;}.prose{max-width:64rem;}.prose > p,.prose > ul,.prose > ol{max-width:48rem;}.prose h2{font-family:var(--font-display);font-size:var(--text-xl);font-weight:500;margin:2.4rem 0 0.8rem;line-height:var(--leading-snug);letter-spacing:var(--tracking-tight);}.prose h3{font-family:var(--font-display);font-size:1.05rem;font-weight:500;margin:1.7rem 0 0.5rem;letter-spacing:var(--tracking-tight);}.prose p,.prose li{color:var(--ink-soft);line-height:var(--leading-body);}.prose ul{padding-left:1.2rem;}.prose table{width:100%;border-collapse:collapse;font-size:var(--text-sm);margin:1.25rem 0;background:var(--white);}.prose th,.prose td{border:1px solid var(--line);padding:0.7rem 0.8rem;text-align:left;vertical-align:top;}.prose th{background:color-mix(in srgb,var(--ink) 3%,var(--paper));font-weight:500;}.faq details{border-top:1px solid var(--line);padding:1rem 0;transition:background-color var(--transition-fast);}.faq details:last-child{border-bottom:1px solid var(--line);}.faq summary{cursor:pointer;font-family:var(--font-display);font-weight:500;font-size:var(--text-md);letter-spacing:var(--tracking-tight);list-style:none;transition:color var(--transition-fast);}.faq summary::-webkit-details-marker{display:none;}.faq summary:hover{color:var(--ink-soft);}.faq details p{margin:0.65rem 0 0;color:var(--muted);line-height:var(--leading-body);}.cta-band{position:relative;margin:2.5rem 0 0;padding:1.65rem 1.75rem;background:var(--ink);color:var(--white);border-radius:var(--radius);display:flex;flex-wrap:wrap;gap:1.25rem;align-items:center;justify-content:space-between;}.cta-band > *{position:relative;z-index:1;}.cta-band p{margin:0;max-width:38ch;color:color-mix(in srgb,var(--white) 82%,transparent);font-size:var(--text-md);line-height:1.55;}.cta-band .btn--primary{background:var(--white);color:var(--ink);border-color:var(--white);}.cta-band .btn--primary:hover{background:color-mix(in srgb,var(--white) 90%,transparent);}.page-hero{position:relative;padding:clamp(3.25rem,7vw,4.5rem) 0 2rem;border-bottom:1px solid var(--line);background:var(--paper);}.page-hero h1{font-family:var(--font-display);font-size:var(--text-3xl);font-weight:500;line-height:var(--leading-tight);letter-spacing:var(--tracking-display);margin:0.35rem 0 0.85rem;max-width:min(100%,42rem);text-wrap:pretty;}.page-hero .lead{margin:0;max-width:min(100%,48rem);color:var(--muted);font-size:var(--text-md);line-height:var(--leading-body);}.guide-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1px;padding:1px;background:var(--line);}.guide-card{display:block;text-decoration:none;color:inherit;background:var(--white);border:0;padding:1.3rem 1.35rem;border-radius:0;transition:background-color var(--transition),transform var(--transition),color var(--transition);}.guide-card:hover{background:var(--paper-2);transform:translateY(-2px);color:inherit;}.guide-card h3{margin:0 0 0.45rem;font-size:1.05rem;font-family:var(--font-display);font-weight:500;letter-spacing:var(--tracking-tight);}.guide-card p{margin:0;color:var(--muted);font-size:var(--text-sm);line-height:1.55;}.metric-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;margin:1.5rem 0;background:var(--line);border:1px solid var(--line);}.metric{display:grid;gap:0.35rem;padding:1.25rem;background:var(--white);}.metric:nth-child(even){background:var(--paper-2);}.metric-card{display:grid;gap:0.35rem;padding:1.25rem;background:var(--white);border:1px solid var(--line);}.metric-card strong{font-family:var(--font-display);font-size:var(--text-2xl);font-weight:500;line-height:1;letter-spacing:var(--tracking-display);color:var(--accent);}.metric-card span{color:var(--muted);font-size:var(--text-sm);}.eyebrow{margin:0 0 0.55rem;color:var(--muted);font-family:var(--font-body);font-size:var(--text-xs);font-weight:500;letter-spacing:var(--tracking-label);text-transform:uppercase;}.lede{font-size:var(--text-md);color:var(--ink-soft);max-width:48rem;line-height:var(--leading-body);}.button{display:inline-flex;align-items:center;justify-content:center;padding:0.72rem 1.2rem;border:1px solid var(--ink);border-radius:var(--radius);background:var(--ink);color:var(--white);font-family:var(--font-body);font-size:var(--text-sm);font-weight:500;letter-spacing:0.02em;text-decoration:none;transition:background-color var(--transition),color var(--transition),border-color var(--transition),transform var(--transition);}.button:hover{background:var(--accent-2);border-color:var(--accent-2);color:var(--white);transform:translateY(-1px);}.button--outline{background:transparent;color:var(--ink);}.button--outline:hover{background:var(--ink);color:var(--white);}.platform-card,.engine-card{padding:1.15rem;border:1px solid var(--line);border-top:2px solid var(--accent);background:var(--white);}.platform-card h3,.engine-card h3{margin:0.25rem 0;font-family:var(--font-display);font-weight:500;letter-spacing:var(--tracking-tight);}.platform-card__rank,.platform-card__category,.platform-card__engines{color:var(--muted);font-size:0.8rem;}.platform-card__figure{margin:0.35rem 0;color:var(--accent);font-size:1.35rem;font-weight:500;}.how-table-wrap{overflow-x:auto;margin:1.75rem 0 1.5rem;border-top:1px solid var(--line);}.how-table{width:100%;border-collapse:collapse;background:transparent;}.how-table caption{caption-side:top;text-align:left;padding:0 0 1rem;font-family:var(--font-body);font-size:var(--text-sm);color:var(--muted);line-height:1.5;}.how-table th,.how-table td{padding:1rem 1.1rem 1rem 0;border:0;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;background:transparent;font-size:var(--text-sm);line-height:1.55;}.how-table thead th{padding-top:0.35rem;padding-bottom:0.85rem;font-family:var(--font-body);font-size:var(--text-xs);font-weight:500;letter-spacing:var(--tracking-label);text-transform:uppercase;color:var(--muted);}.how-table tbody th{font-family:var(--font-display);font-weight:500;letter-spacing:var(--tracking-tight);color:var(--ink);width:42%;}.how-table tbody td{color:var(--ink-soft);}.how-table code{font-size:0.86em;padding:0.12em 0.35em;background:var(--paper-2);border-radius:var(--radius);}.metric strong{font-family:var(--font-display);font-size:var(--text-2xl);font-weight:500;line-height:1;letter-spacing:var(--tracking-display);color:var(--accent);}.metric span{color:var(--muted);font-size:var(--text-sm);}.source-strip{display:flex;flex-wrap:wrap;gap:0.65rem;margin:1.2rem 0;}.source-strip span{padding:0.5rem 0.75rem;background:var(--paper-2);border:1px solid var(--line);border-radius:999px;font-size:0.86rem;}.data-note,.data-caption{color:var(--muted);font-size:0.88rem;}.data-note{padding:0.9rem 1rem;border:1px solid var(--line);background:var(--paper-2);margin:1rem 0 1.5rem;}.method-grid,.engine-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:1px;margin:1.5rem 0;padding:1px;background:var(--line);}.method-grid > div,.method-grid > article,.engine-grid > section,.engine-grid > article{padding:1.15rem;border:0;border-top:2px solid var(--accent);background:var(--white);}.method-grid span{color:var(--muted);font-weight:500;font-size:var(--text-xs);letter-spacing:var(--tracking-label);}.method-grid h3,.engine-grid h3{margin:0.45rem 0;font-family:var(--font-display);font-weight:500;letter-spacing:var(--tracking-tight);}.method-grid p,.engine-grid p,.engine-grid li{color:var(--muted);font-size:0.9rem;}.engine-grid ol{padding-left:1.2rem;}.source-table td:first-child{white-space:nowrap;}.site-footer{position:relative;margin-top:0;padding:var(--space-section) 0 2rem;background:var(--paper-2);color:var(--muted);border-top:1px solid var(--line);}.site-footer a{color:var(--ink-soft);text-decoration:none;transition:color var(--transition-fast);}.site-footer a:hover{color:var(--ink);}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2.5rem;margin-bottom:2.5rem;}.footer-brand{display:inline-flex;align-items:center;gap:0.65rem;font-family:var(--font-display);font-size:1rem;font-weight:600;letter-spacing:-0.02em;color:var(--ink);margin:0 0 0.75rem;text-decoration:none;transition:opacity var(--transition-fast);}.footer-brand:hover{opacity:0.72;color:var(--ink);}.footer-tagline{margin:0 0 0.85rem;font-family:var(--font-display);font-size:var(--text-sm);font-weight:400;letter-spacing:0.02em;color:var(--ink-soft);}.footer-col h3{margin:0 0 0.85rem;color:var(--ink);font-family:var(--font-body);font-size:var(--text-xs);font-weight:500;letter-spacing:var(--tracking-label);text-transform:uppercase;}.footer-col ul{list-style:none;margin:0;padding:0;}.footer-col li{margin:0.45rem 0;font-size:var(--text-sm);}.footer-bottom{border-top:1px solid var(--line);padding-top:1.15rem;display:flex;flex-wrap:wrap;gap:0.75rem 1.5rem;justify-content:space-between;font-size:var(--text-sm);}.footer-bottom__end{display:flex;align-items:center;gap:1rem;}.theme-toggle{width:30px;height:30px;display:inline-flex;align-items:center;justify-content:center;padding:0;color:var(--muted);background:transparent;border:1px solid var(--line);border-radius:50%;cursor:pointer;transition:color var(--transition-fast),border-color var(--transition-fast),background-color var(--transition-fast),transform var(--transition);}.theme-toggle:hover{color:var(--ink);border-color:var(--ink-soft);transform:rotate(12deg);}.theme-toggle__sun{display:none;}[data-theme="dark"] .theme-toggle__sun{display:block;}[data-theme="dark"] .theme-toggle__moon{display:none;}.reveal{opacity:0;transform:translateY(18px);transition:opacity var(--transition-slow),transform 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