.aiguide{--navy:#0f766e;--navy-deep:#115e59;--ink:#1a1f2b;--muted:#5a6478;--paper:#f5f7fb;--card:#ffffff;--line:#e2e7f1;--line-2:#edeff5;--tint:#eef2fb;--s0:#f03c00;--s1:#ff8674;--s2:#ffe76d;--s3:#00b388;--s4:#6d2077;--serif:var(--font-lato),system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;--sans:var(--font-lato),system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.5;-webkit-font-smoothing:antialiased}.aiguide *{box-sizing:border-box}.aiguide .wrap{max-width:1080px;margin:0 auto;padding:0 24px}.aiguide .hero{background:var(--card);color:var(--ink);padding:44px 0 30px}.aiguide .hero .wrap{padding-top:6px}.aiguide .kicker{font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--navy);margin:0 0 14px;font-weight:700}.aiguide .h1{font-family:var(--sans);font-weight:900;font-size:clamp(2rem,5vw,3.1rem);line-height:1.07;margin:0 0 16px;letter-spacing:-.02em;color:var(--ink)}.aiguide .h1 em{font-style:normal;color:var(--navy)}.aiguide .hero-sub{font-size:1.08rem;color:var(--muted);max-width:56ch;margin:0 0 26px}.aiguide .hero-credit{display:flex;align-items:center;gap:10px;margin:0;flex-wrap:wrap}.aiguide .hero-credit-l{font-size:.78rem;color:var(--muted);font-weight:600}.aiguide .hero-logo{height:19px;width:auto;display:block}.aiguide .spectrum{height:4px;width:100%;background:linear-gradient(90deg,var(--navy) 0,var(--navy-deep) 100%)}.aiguide .jump-nav{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.aiguide .jump-nav .wrap{display:flex;gap:6px;flex-wrap:wrap;padding-top:9px;padding-bottom:9px}.aiguide .jump-nav a{font-family:var(--sans);font-size:.82rem;font-weight:600;color:var(--muted);text-decoration:none;padding:5px 12px;border-radius:999px}.aiguide .jump-nav a:hover{color:var(--navy);background:var(--tint)}.aiguide .intro{padding:56px 0 4px}.aiguide .intro .lead{font-family:var(--serif);font-size:clamp(1.18rem,2.4vw,1.5rem);line-height:1.5;max-width:62ch;margin:0 0 22px;color:#2a3243}.aiguide .intro p.body{max-width:64ch;color:#3a4254;margin:0 0 18px;font-size:1.02rem}.aiguide .lp-num{flex:0 0 auto;width:30px;height:30px;border-radius:8px;background:var(--navy);color:#fff;font-family:var(--sans);font-weight:700;font-size:.92rem;display:grid;place-items:center;margin-top:1px}.aiguide .thesis{padding:44px 0 8px}.aiguide .ladder{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:6px}.aiguide .rung{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;box-shadow:0 1px 2px rgba(22,38,94,.04)}.aiguide .rung .lp-num{margin:0 0 12px}.aiguide .rung-t{font-family:var(--sans);font-weight:700;font-size:1.12rem;margin:0 0 5px;color:var(--navy);letter-spacing:-.005em;display:flex;align-items:center;gap:8px}.aiguide .rung-icon{flex:0 0 auto;color:var(--navy)}.aiguide .rung-d{font-family:var(--serif);font-size:1rem;line-height:1.42;margin:0;color:#404a60}.aiguide .rung-terms{margin-top:14px;padding-top:12px;border-top:1px solid var(--line-2)}.aiguide .rung-terms-l{display:block;font-size:.6rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);font-weight:700;margin:0 0 8px}.aiguide .rung-chips{display:flex;flex-wrap:wrap;gap:5px}.aiguide .chip{font-family:var(--sans);font-size:.72rem;font-weight:600;color:var(--navy);background:var(--tint);border:1px solid var(--line);border-radius:999px;padding:3px 9px;line-height:1.3}.aiguide .work-bar{height:6px;border-radius:4px;margin:16px 0 7px;background:linear-gradient(90deg,#c9d4ee 0,#7c8fcb 50%,var(--navy) 100%)}.aiguide .work-label{margin:0;text-align:right;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:600}.aiguide .thesis-body{margin-top:26px;max-width:68ch}.aiguide .thesis-body p{font-family:var(--serif);font-size:1.08rem;line-height:1.6;color:#2a3243;margin:0 0 16px}.aiguide .thesis-body .how-to-read{font-family:var(--sans);font-size:.96rem;color:var(--muted);margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}.aiguide .fn{text-decoration:none}.aiguide .fn sup,.aiguide .fn-plain{color:var(--navy);font-weight:700;font-size:.66em;padding:0 1px;line-height:0}.aiguide .fn:hover sup{text-decoration:underline}.aiguide .card-refs{padding:12px 26px 15px;display:flex;flex-wrap:wrap;gap:3px 16px;align-items:baseline;background:#fbfcfe;border-top:1px solid var(--line-2)}.aiguide .card-refs-l{font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-right:2px}.aiguide .card-ref{font-size:.78rem;color:var(--muted);scroll-margin-top:18px}.aiguide .card-ref a{color:var(--navy);text-decoration:none;border-bottom:1px solid #c7d0e6}.aiguide .card-ref a:hover{border-color:var(--navy)}.aiguide .thesis-body .card-refs{padding:14px 0 0;background:none;border-top:1px solid var(--line);margin-top:14px}.aiguide .card-ref a.card-ref-n{border-bottom:none;font-weight:600;margin-right:1px}.aiguide .card-ref a.card-ref-n:hover{border-bottom:1px solid var(--navy)}.aiguide .fn{scroll-margin-top:90px}.aiguide .group{padding:32px 0 4px;scroll-margin-top:56px}.aiguide .group-h{margin:14px 0 18px;border-bottom:1px solid var(--line);padding-bottom:14px}.aiguide .eyebrow{font-family:var(--sans);font-size:clamp(1.5rem,3vw,2rem);font-weight:800;margin:0;color:var(--ink);letter-spacing:-.02em}.aiguide .group-d{margin:6px 0 0;color:var(--muted);font-size:.98rem}.aiguide .card{background:var(--card);border:1px solid var(--line);border-radius:14px;margin:0 0 16px;box-shadow:0 1px 2px rgba(22,38,94,.04);overflow:hidden}.aiguide .card-h{padding:22px 26px 16px;border-bottom:1px solid var(--line-2);display:flex;align-items:flex-start;justify-content:space-between;gap:12px;flex-wrap:wrap}.aiguide .card-t{font-family:var(--sans);font-weight:600;font-size:1.18rem;margin:0;letter-spacing:-.005em}.aiguide .card-level-tag{flex:0 0 auto;display:inline-flex;align-items:center;gap:6px;font-family:var(--sans);font-size:.72rem;font-weight:700;color:var(--ink);background:#fff;border:1px solid var(--line);border-left:3px solid var(--level,var(--navy));border-radius:7px;padding:3px 9px;white-space:nowrap}.aiguide .card-level-tag .dot{width:7px;height:7px;border-radius:50%;background:var(--level,var(--navy))}.aiguide .level{display:flex;align-items:flex-start;gap:10px;margin:12px 0 0}.aiguide .level-pill{flex:0 0 auto;display:inline-flex;align-items:center;gap:7px;font-family:var(--sans);font-weight:700;font-size:.74rem;letter-spacing:.01em;color:var(--ink);background:var(--card);border:1px solid var(--line);border-left:4px solid var(--level,var(--navy));border-radius:8px;padding:5px 11px 5px 9px}.aiguide .level-pill .dot{width:9px;height:9px;border-radius:50%;background:var(--level,var(--navy))}.aiguide .level-pill .level-icon{flex:0 0 auto;color:var(--level,var(--navy))}.aiguide .level-reason{margin:0;font-family:var(--serif);font-size:.9rem;line-height:1.4;color:var(--muted)}.aiguide .cols{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding:20px 26px 22px}.aiguide .col-why{border-left:1px solid var(--line-2);padding-left:30px}.aiguide .lab{font-size:.68rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);font-weight:600;margin:0 0 9px}.aiguide .do{margin:0;font-family:var(--sans);font-size:.98rem;line-height:1.55;color:#2b3242}.aiguide .why{margin:0;font-family:var(--serif);font-size:1.04rem;line-height:1.58;color:#2b3242}.aiguide .ai-use{padding:16px 26px 20px;border-top:1px solid var(--line-2)}.aiguide .ai-list{list-style:none;margin:0;padding:0}.aiguide .ai-list li{position:relative;padding-left:18px;margin:0 0 11px;font-family:var(--sans);font-size:.93rem;line-height:1.5;color:#3a4254}.aiguide .ai-list li:last-child{margin-bottom:0}.aiguide .ai-list li:before{content:"";position:absolute;left:3px;top:8px;width:5px;height:5px;border-radius:50%;background:var(--navy);opacity:.5}.aiguide .tool{font-weight:700;color:var(--navy)}.aiguide .prompt{display:block;margin-top:6px;font-style:italic;color:#5a6478;font-size:.85rem;line-height:1.45;padding-left:11px;border-left:2px solid var(--line)}.aiguide .prompt:before{content:"\201C"}.aiguide .prompt:after{content:"\201D"}.aiguide .prompt[data-subject-variant]{display:none}.aiguide .prompt[data-subject-variant~=geo]{display:block}[data-aiguide-subject=ess] .aiguide .prompt[data-subject-variant]{display:none}[data-aiguide-subject=ess] .aiguide .prompt[data-subject-variant~=ess]{display:block}[data-aiguide-subject=maths] .aiguide .prompt[data-subject-variant]{display:none}[data-aiguide-subject=maths] .aiguide 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.scale-name{font-family:var(--sans);font-weight:700;color:var(--ink)}.aiguide .scale-meaning b{font-weight:700}.aiguide .scale-ack{color:var(--muted)}.aiguide .refs{padding:48px 0 10px;scroll-margin-top:20px}.aiguide .refs h1,.aiguide .refs h2{font-family:var(--sans);font-size:1.6rem;font-weight:800;letter-spacing:-.02em;color:var(--ink);margin:0 0 4px}.aiguide .refs .sub{color:var(--muted);font-size:.94rem;margin:0 0 20px;max-width:60ch}.aiguide ol.reflist{margin:0;padding:0;list-style:none;counter-reset:r}.aiguide .ref{font-size:.9rem;line-height:1.5;color:#39414f;padding:0 0 14px 34px;position:relative;scroll-margin-top:80px}.aiguide .ref:before{content:counter(r);counter-increment:r;position:absolute;left:0;top:1px;font-family:var(--sans);font-weight:600;color:var(--navy);font-size:.78rem;width:22px;text-align:right}.aiguide .ref i{font-style:italic}.aiguide .ref a{color:var(--navy);text-decoration:none;border-bottom:1px solid #c7d0e6;word-break:break-word}.aiguide .ref 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