body[data-page="foundation"]{background:#faf9f6;color:#2b313e}
body[data-page="foundation"] .foundation-hero{padding-top:calc(var(--header-h,84px) + 55px);padding-bottom:65px;background:radial-gradient(ellipse at 70% 55%,#e3e9da88,transparent 65%),linear-gradient(155deg,#fff,#f4f1e9)}
.foundation-intro{text-align:center;max-width:960px;margin:auto}
.foundation-intro .h1{font-size:clamp(43px,5.5vw,80px);line-height:1.03;color:#174334;margin:20px auto;max-width:21ch}
.foundation-intro .eyebrow{display:block;color:#8a6d32}
.foundation-intro .eyebrow:before{display:none}
.foundation-intro .topic{max-width:58ch;margin:22px auto;color:#365243;font-size:clamp(17px,1.5vw,21px)}
.foundation-actions{display:flex;gap:22px;justify-content:center;align-items:center;flex-wrap:wrap;margin-top:25px}
.foundation-book{position:relative;max-width:930px;margin:58px auto 25px;padding:0 22px;perspective:1800px}
.book-spread{position:relative;display:grid;grid-template-columns:1fr 1fr;min-height:395px;border:1px solid #b5a17580;border-radius:5px 17px 17px 5px;background:#f9f7ef;box-shadow:0 4px 0 #e2dfd2,0 7px 0 #fcfaf3,0 9px 0 #c6bda8,0 22px 46px #203e3220;transform:rotateX(4deg);transform-style:preserve-3d}
.book-cover{position:relative;display:flex;flex-direction:column;justify-content:space-between;padding:35px 38px;background:linear-gradient(125deg,#dbe5cf,#b9cdae 70%,#88a38a);border-radius:5px 0 0 5px;color:#174334;box-shadow:inset -14px 0 22px #183a2b15}
.book-cover:after{content:"";position:absolute;inset:14px;border:1px solid #ffffff80;border-radius:2px;pointer-events:none}
.book-imprint{font:600 10px var(--sans);letter-spacing:.23em;color:#31543e}
.book-cover h2{font:500 clamp(30px,3.8vw,48px)/1.06 var(--display);letter-spacing:-.03em;margin:18px 0 12px;max-width:10ch}
.book-cover p{font:400 13px/1.5 var(--sans);max-width:23ch;margin:0}
.book-emblem{width:120px;height:100px;align-self:center;margin:10px 0;filter:drop-shadow(0 7px 5px #17433418)}
.book-paper{position:relative;padding:36px 40px 28px;background:linear-gradient(90deg,#ddd6c633,#fffdf7 8%,#faf8f0);border-radius:0 17px 17px 0;min-width:0;color:#2b313e}
.book-paper h3{font:500 clamp(29px,3vw,40px)/1.07 var(--display);letter-spacing:-.025em;margin:22px 0 18px;color:#174334}
.book-kicker{font:600 10px/1.5 var(--sans);color:#8a6d32;letter-spacing:.15em;text-transform:uppercase}
.book-paper p{font:400 15px/1.7 var(--sans);margin:0 0 20px}
.book-paper .book-prompt{font:500 18px/1.35 var(--display);color:#42624c;border-top:1px solid #b8985a66;padding-top:18px;margin-top:20px}
.book-page-number{display:block;text-align:right;font:500 13px var(--display);color:#8a6d32;margin-top:20px}
.book-leaf{position:absolute;left:50%;right:0;top:0;bottom:0;z-index:4;transform-origin:left center;backface-visibility:hidden;pointer-events:none;box-shadow:-8px 4px 20px #1d39251a;overflow:hidden}
.book-controls{display:flex;justify-content:center;gap:20px;align-items:center;margin-top:27px}
.book-controls button,.book-tabs button{border:0;background:transparent;color:#37533f;cursor:pointer;font:500 12px/1.5 var(--sans);padding:10px}
.book-controls button{border-bottom:1px solid #b8985a66;min-width:90px}
.book-controls button:disabled{opacity:.4;cursor:default}
.book-tabs{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:22px auto 0;max-width:900px}
.book-tabs button{border-bottom:2px solid transparent;color:#657366}
.book-tabs button[aria-selected="true"]{border-color:#b8985a;color:#174334;background:#e9e9dc77}
.book-tabs button:focus-visible,.book-controls button:focus-visible{outline:2px solid #8a6d32;outline-offset:4px}
.book-status{font:400 12px var(--sans);color:#657366;min-width:75px;text-align:center}
.foundation-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:25px;margin-top:36px}
.foundation-tile{border-top:1px solid #b8985a88;padding:25px 0;color:#4e5563}
.foundation-tile h3{font:500 29px/1.15 var(--display);color:#174334;margin:15px 0}
.foundation-tile p{font:400 16px/1.7 var(--sans);margin:0}
.foundation-number{font:500 34px var(--display);color:#a28a56}
.foundation-band{background:linear-gradient(135deg,#edf0e5,#f6f4eb)}
.foundation-note{margin-top:30px;padding:22px 26px;border-left:2px solid #b8985a;background:#fff9;color:#4e5563;font-size:15px;line-height:1.7}
.foundation-units{margin-top:35px;border-top:1px solid #b8985a66}
.foundation-units details{border-bottom:1px solid #b8985a66;padding:22px 0}
.foundation-units summary{display:flex;align-items:center;gap:24px;cursor:pointer;color:#174334;font:500 clamp(24px,2.5vw,34px) var(--display);list-style:none}
.foundation-units summary::-webkit-details-marker{display:none}
.foundation-units summary:after{content:"+";margin-left:auto;color:#8a6d32}
.foundation-units details[open] summary:after{content:"−"}
.foundation-units summary:focus-visible{outline:2px solid #8a6d32;outline-offset:5px}
.foundation-units details p{max-width:74ch;margin:20px 0 8px 61px;line-height:1.75;color:#4e5563}
.foundation-takeaways{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 45px;margin-top:25px}
.foundation-takeaways article{padding:25px 0;border-bottom:1px solid #b8985a55}
.foundation-takeaways h3{font:500 27px var(--display);color:#174334;margin:0 0 12px}
.foundation-takeaways p{color:#4e5563;line-height:1.7;margin:0}
.foundation-bridge{text-align:center;font:500 clamp(28px,3.3vw,44px)/1.2 var(--display);color:#174334;max-width:28ch;margin:45px auto 0}
.foundation-bridge:after{content:"";display:block;width:110px;height:1px;background:#b8985a;margin:25px auto 0}
body[data-page="foundation"] .metric-value{color:#2b313e}
body[data-page="foundation"] .metrics{margin-top:45px}
.book-nojs{max-width:72ch;margin:25px auto;padding:20px;color:#174334}
@media(max-width:760px){.foundation-hero{padding-top:115px}.foundation-grid,.foundation-takeaways{grid-template-columns:1fr}.foundation-book{padding:0 8px;margin-top:35px}.book-cover{display:none}.book-spread{display:block;min-height:395px;transform:none}.book-paper{min-height:395px;padding:30px 26px;border-radius:8px}.book-leaf{left:0}.book-tabs{gap:0}.book-tabs button{font-size:11px;padding:10px 9px}.foundation-units details p{margin-left:0}.foundation-units summary{gap:15px}.foundation-actions{gap:15px}.foundation-intro .h1{font-size:44px}.book-paper h3{font-size:34px}}
@media(prefers-reduced-motion:reduce){.book-spread{transform:none}.book-leaf{display:none}}
@media print{.book-controls,.book-tabs,.book-leaf{display:none}.book-spread{box-shadow:none;transform:none}.foundation-units details{display:block}.foundation-units details>*{display:block!important}}