/* Native introduction and tool navigation. The authored book stays isolated. */
body.gcbg-sketchbook-preview .gcbg-exact-preview,body.gcbg-sketchbook-preview .gcbg-exact-preview *{box-sizing:border-box}
body.gcbg-sketchbook-preview .gcbg-exact-preview{width:100%;margin:0 auto;background:#ece7dc;color:#2b2721}
body.gcbg-sketchbook-preview .gcbg-exact-preview .gcbg-eyebrow{font:600 12px/1.5 'SK Text',Arial,sans-serif;letter-spacing:.13em;text-transform:uppercase;color:#67563e;margin:0 0 16px}
body.gcbg-sketchbook-preview .gcbg-welcome{max-width:1180px;margin:auto;padding:64px 28px 48px;text-align:center}
body.gcbg-sketchbook-preview .gcbg-welcome h1{font:400 clamp(42px,5.6vw,76px)/1.03 'SK Display',Georgia,serif;letter-spacing:-.025em;margin:0 auto 24px;max-width:960px;color:#2b2721}
body.gcbg-sketchbook-preview .gcbg-welcome-copy{font:20px/1.55 'SK Text',Georgia,serif;max-width:780px;margin:0 auto 28px;color:#51483b}
body.gcbg-sketchbook-preview .gcbg-welcome-actions{display:flex;align-items:center;justify-content:center;gap:12px 18px;flex-wrap:wrap}
body.gcbg-sketchbook-preview .gcbg-exact-preview a.gcbg-primary,body.gcbg-sketchbook-preview .gcbg-exact-preview a.gcbg-secondary{display:inline-flex;gap:18px;justify-content:center;align-items:center;min-height:52px;padding:13px 23px;border:1px solid #675740;border-radius:5px;font:600 15px/1.5 'SK Text',Arial,sans-serif;text-decoration:none}
body.gcbg-sketchbook-preview .gcbg-exact-preview a.gcbg-primary{background:#3e4a35;border-color:#3e4a35;color:#fffaf0;box-shadow:0 3px 0 #2b27211c}
body.gcbg-sketchbook-preview .gcbg-exact-preview a.gcbg-secondary{color:#2b2721;background:#f8f3e9}
body.gcbg-sketchbook-preview .gcbg-exact-preview a.gcbg-primary:hover{background:#2e3927}
body.gcbg-sketchbook-preview .gcbg-exact-preview a.gcbg-secondary:hover{background:#e3d9c8}
body.gcbg-sketchbook-preview .gcbg-exact-preview a.gcbg-text-link{display:inline-flex;align-items:center;min-height:44px;color:#443a2b;font:600 15px/1.5 'SK Text',Arial,sans-serif;text-underline-offset:5px}
body.gcbg-sketchbook-preview .gcbg-start-note{font:14px/1.55 'SK Text',Arial,sans-serif;color:#645b4d;margin:18px auto 0;max-width:680px}
body.gcbg-sketchbook-preview #gcbg-threeui-root .shader-frame{height:calc(100svh - 110px);min-height:680px;width:100%;isolation:isolate}
body.gcbg-sketchbook-preview .gcbg-how,body.gcbg-sketchbook-preview .gcbg-exact-tools,body.gcbg-sketchbook-preview .gcbg-stage-links{max-width:1280px;margin:0 auto;padding:60px max(24px,5vw)}
body.gcbg-sketchbook-preview .gcbg-exact-preview h2{font:400 clamp(32px,3.4vw,46px)/1.15 'SK Display',Georgia,serif;letter-spacing:-.015em;margin:0 0 18px}
body.gcbg-sketchbook-preview .gcbg-how{border-bottom:1px solid #bdb09b}
body.gcbg-sketchbook-preview .gcbg-how ol{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px;padding:0;margin:32px 0 20px}
body.gcbg-sketchbook-preview .gcbg-how li{padding:0;margin:0}
body.gcbg-sketchbook-preview .gcbg-how li>span{font:400 26px/1.2 'SK Display',Georgia,serif;color:#806440;display:block;margin-bottom:14px}
body.gcbg-sketchbook-preview .gcbg-how h3,body.gcbg-sketchbook-preview .gcbg-exact-tools h3{font:400 27px/1.18 'SK Display',Georgia,serif;margin:0 0 12px}
body.gcbg-sketchbook-preview .gcbg-how li p,body.gcbg-sketchbook-preview .gcbg-exact-tools article p{font:17px/1.55 'SK Text',Georgia,serif;margin:0;color:#51483b}
body.gcbg-sketchbook-preview .gcbg-exact-tools{scroll-margin-top:130px}
body.gcbg-sketchbook-preview .gcbg-exact-tools>p:not(.gcbg-eyebrow),body.gcbg-sketchbook-preview .gcbg-stage-links>p{font:19px/1.6 'SK Text',Georgia,serif;margin:0 0 28px;max-width:800px;color:#51483b}
body.gcbg-sketchbook-preview .gcbg-exact-tools>div{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
body.gcbg-sketchbook-preview .gcbg-exact-tools article{padding:28px;border:1px solid #bdb09b;border-radius:5px;background:#faf7ef;display:flex;flex-direction:column}
body.gcbg-sketchbook-preview .gcbg-exact-tools article>a{margin-top:auto;padding-top:18px;min-height:44px;font:600 15px/1.5 'SK Text',Arial,sans-serif;color:#3e4a35;text-underline-offset:5px}
body.gcbg-sketchbook-preview .gcbg-stage-links{padding-top:20px}
body.gcbg-sketchbook-preview .gcbg-stage-links>div{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
body.gcbg-sketchbook-preview .gcbg-stage-links article{border-top:1px solid #bdb09b;padding:20px 0}
body.gcbg-sketchbook-preview .gcbg-stage-links h3{font:400 28px/1.2 'SK Display',Georgia,serif;margin:0 0 12px}
body.gcbg-sketchbook-preview .gcbg-stage-links nav{display:flex;flex-wrap:wrap;gap:8px}
body.gcbg-sketchbook-preview .gcbg-stage-links a{display:inline-flex;align-items:center;min-height:44px;padding:7px 10px;border:1px solid #bdb09b;color:#2b2721;text-decoration:none;font:14px/1.5 'SK Text',Arial,sans-serif;background:#faf7ef}
body.gcbg-sketchbook-preview .gcbg-start-again{padding:46px 24px 56px;text-align:center;background:#e0dfd0;border-top:1px solid #bdb09b}
body.gcbg-sketchbook-preview .gcbg-start-again p{font:19px/1.6 'SK Text',Georgia,serif;margin:0 auto 24px;max-width:640px}
body.gcbg-sketchbook-preview .gcbg-start-again>a{margin:0 9px}
body.gcbg-sketchbook-preview .gcbg-exact-preview a:focus-visible{outline:3px solid #80532f;outline-offset:4px}
@media(max-width:800px){body.gcbg-sketchbook-preview .gcbg-exact-tools>div{grid-template-columns:repeat(2,minmax(0,1fr))}body.gcbg-sketchbook-preview .gcbg-stage-links>div{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){body.gcbg-sketchbook-preview .gcbg-welcome{padding:36px 22px 28px}body.gcbg-sketchbook-preview .gcbg-welcome h1{font-size:44px;margin-bottom:20px}body.gcbg-sketchbook-preview .gcbg-welcome-copy{font-size:18px}body.gcbg-sketchbook-preview .gcbg-welcome-actions{gap:10px}body.gcbg-sketchbook-preview .gcbg-welcome-actions>a{width:100%}body.gcbg-sketchbook-preview #gcbg-threeui-root .shader-frame{height:calc(100svh - 110px);min-height:560px}body.gcbg-sketchbook-preview .gcbg-how,body.gcbg-sketchbook-preview .gcbg-exact-tools,body.gcbg-sketchbook-preview .gcbg-stage-links{padding:38px 22px}body.gcbg-sketchbook-preview .gcbg-how ol,body.gcbg-sketchbook-preview .gcbg-exact-tools>div{grid-template-columns:1fr;gap:24px}body.gcbg-sketchbook-preview .gcbg-how li>span{float:left;width:42px;margin-bottom:0}body.gcbg-sketchbook-preview .gcbg-how li h3,body.gcbg-sketchbook-preview .gcbg-how li p{margin-left:42px}body.gcbg-sketchbook-preview .gcbg-start-again>a{margin:6px 0}body.gcbg-sketchbook-preview .gcbg-exact-tools article{padding:24px}}
@media(prefers-reduced-motion:reduce){body.gcbg-sketchbook-preview .gcbg-exact-preview{scroll-behavior:auto}}