/* Knowledge map: transparent groups around a quiet central orbit. */
#overview{--map-blue:#a4d3df;--map-gold:#e7c58e;isolation:isolate}
#overview .atlas-heading{padding:8px 2% 0;display:flex;align-items:flex-end;justify-content:space-between;gap:30px}
#overview .atlas-heading .eyebrow{margin-bottom:10px;font-size:10px;letter-spacing:.22em}
#overview .atlas-heading h1{font-size:clamp(25px,2.3vw,34px);font-weight:450;letter-spacing:.07em}
#overview .atlas-heading .definition{font-size:13px;line-height:1.8;letter-spacing:.07em;color:#a7b7bc;margin:0 0 7px;white-space:nowrap}
#overview .atlas-heading .definition:before{content:'';display:inline-block;width:4px;height:4px;background:var(--map-gold);border-radius:50%;vertical-align:3px;margin-right:12px;box-shadow:0 0 12px #e7c58e55}
.atlas-map{position:relative;height:clamp(480px,calc(100svh - 255px),640px);max-width:1220px;margin:16px auto 0}
.map-nebula{position:absolute;inset:6% 14%;pointer-events:none;background:radial-gradient(ellipse at 44% 48%,#4b718c15,transparent 48%),radial-gradient(ellipse at 57% 62%,#be997410,transparent 42%);filter:blur(15px)}
.map-wires{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}
.map-branch{fill:none;stroke:#9ebccc42;stroke-width:1;transition:stroke .3s,filter .3s}
.map-branch.planned{stroke:#879d9f30;stroke-dasharray:3 8}
.map-orbit{fill:none;stroke:#a9c6d20b;stroke-width:1}
.map-orbit-tick{fill:#accad430}
.core-link{position:absolute;left:47%;top:49%;width:216px;height:216px;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;z-index:2;outline-offset:12px!important;border-radius:50%;color:var(--ink)}
.core-rings{position:absolute;inset:0;border:1px solid #d8c7a934;border-radius:50%;background:radial-gradient(circle,#101a24df 30%,#0c121c96 69%,transparent 71%);box-shadow:0 0 60px #b8c4cc08,inset 0 0 42px #c3b28906;transition:border-color .35s,box-shadow .35s;z-index:-1}
.core-rings:before{content:'';position:absolute;inset:-13px;border:1px solid #b5c9d018;border-radius:50%}
.core-rings:after{content:'';position:absolute;inset:12px;border:1px solid #d7c29410;border-radius:50%}
.core-rings>span{position:absolute;left:20%;top:7%;height:4px;width:4px;background:#e7c58e9c;border-radius:50%;box-shadow:0 0 11px #e7c58e72}
.core-star{width:6px;height:6px;border-radius:50%;background:var(--map-gold);box-shadow:0 0 10px #e7c58e8c,0 0 26px #e7c58e42;margin:0 0 17px}
.core-title{font-size:24px;line-height:1.55;font-weight:450;letter-spacing:.13em;padding-left:.13em}
.core-caption{font-size:10px;letter-spacing:.08em;color:#99a9b1;margin-top:13px}
.core-enter{position:absolute;top:calc(100% + 23px);font-size:10px;letter-spacing:.12em;color:var(--map-gold);opacity:0;transform:translateY(-3px);transition:opacity .25s,transform .25s;white-space:nowrap}
.core-link:hover,.core-link:focus-visible{color:#f2dfbf}
.core-link:hover .core-rings,.core-link:focus-visible .core-rings{border-color:#e7c58e85;box-shadow:0 0 70px #d7c49a13,inset 0 0 40px #d7c49a0b}
.core-link:hover .core-enter,.core-link:focus-visible .core-enter{opacity:1;transform:translateY(0)}
.map-group{position:absolute;width:265px;z-index:1}
.map-observe{left:3%;top:12%;width:232px}
.map-derive{right:1%;top:5%;width:282px}
.map-gravity{right:3.5%;bottom:3%;width:252px}
.map-pursuit{left:3%;bottom:9%;width:232px;min-height:145px}
.group-heading{position:relative;display:flex;align-items:center;gap:12px;padding:0 0 13px;margin-bottom:6px;border-bottom:1px solid #a4c5d319}
.group-heading h2{margin:0;font-size:11px;font-weight:400;letter-spacing:.15em;color:#a4b7c1;line-height:1.8}
.group-index{font-size:9px;letter-spacing:.08em;color:#617d8b;font-variant-numeric:tabular-nums}
.group-port{position:absolute;left:-17px;top:9px;width:5px;height:5px;border-radius:50%;border:1px solid #a4d3df80;background:#162532;box-shadow:0 0 12px #a4d3df16;transition:border-color .3s,box-shadow .3s}
.map-observe .group-port,.map-pursuit .group-port{left:auto;right:-16px}
.map-topics{position:relative;margin-left:1px;padding:1px 0}
.map-topics:before{content:'';position:absolute;left:0;top:22px;bottom:22px;width:1px;background:linear-gradient(#a4c5d328,#a4c5d30a)}
.map-topics a{display:flex;align-items:center;justify-content:space-between;gap:8px;position:relative;padding:8px 7px 8px 17px;min-height:43px;font-size:15px;letter-spacing:.01em;white-space:nowrap;transition:color .2s,background .2s}
.map-topics a:before{content:'';position:absolute;width:4px;height:4px;left:-1.5px;top:calc(50% - 2px);background:#b0d0d4a6;border-radius:50%;transition:box-shadow .2s,background .2s}
.map-topics a>span{font-size:12px;color:var(--map-gold);opacity:0;transform:translateX(-3px);transition:opacity .2s,transform .2s}
.map-topics a:hover,.map-topics a:focus-visible{color:#efdbb9;background:linear-gradient(90deg,#bca4720b,transparent);outline-offset:2px}
.map-topics a:hover:before,.map-topics a:focus-visible:before{background:var(--map-gold);box-shadow:0 0 10px #e7c58eaa}
.map-topics a:hover>span,.map-topics a:focus-visible>span{opacity:1;transform:translateX(0)}
.map-group:not(.is-planned):hover .group-port,.map-group:focus-within .group-port{border-color:var(--map-gold);box-shadow:0 0 12px #e7c58e6b}
.is-planned .group-heading{border-bottom-style:dashed;border-bottom-color:#8b9ba116}
.is-planned .group-heading h2,.is-planned .group-index{color:#708087}
.is-planned .group-port{border-color:#8b9ba14d;box-shadow:none;background:#080f17}
.planned-topic{display:flex;align-items:center;gap:13px;position:relative;padding:14px 0;color:#8c9ba2;font-size:16px}
.planned-star{width:5px;height:5px;flex:none;border:1px solid #8b9ba177;border-radius:50%;margin-left:-1px}
.planned-topic small{font-size:10px;letter-spacing:.08em;color:#67767e;margin-left:auto}
.reserved-track{height:37px;margin-left:1px;border-left:1px dashed #8b9ba127;display:flex;flex-direction:column;justify-content:space-around}
.reserved-track span{display:block;width:42px;height:1px;background:linear-gradient(90deg,#8b9ba11e,transparent)}
#knowledge-network[data-active=observe] [data-branch=observe],#knowledge-network[data-active=derive] [data-branch=derive],#knowledge-network[data-active=gravity] [data-branch=gravity],#knowledge-network[data-active=core] .map-branch:not(.planned){stroke:#e7c58e91;filter:drop-shadow(0 0 3px #e7c58e35)}
@media(min-width:1550px){.map-topics a{font-size:16px}.map-group{width:290px}.map-observe,.map-pursuit{width:245px}.core-link{width:236px;height:236px}.core-title{font-size:26px}}
@media(min-width:761px) and (max-width:1050px){#overview .atlas-heading{display:block;padding-left:0}#overview .atlas-heading .definition{margin-top:10px}.atlas-map{height:620px}.core-link{left:43%;top:48%;width:174px;height:174px}.core-title{font-size:20px}.core-star{margin-bottom:10px}.core-caption{font-size:9px;margin-top:8px}.map-observe{left:0;top:6%;width:185px}.map-derive{right:0;top:5%;width:258px}.map-gravity{right:0;bottom:2%;width:244px}.map-pursuit{left:0;bottom:7%;width:190px}.map-topics a{font-size:14px;padding-left:13px}.group-heading{gap:8px}}
@media(max-width:760px){#overview .atlas-heading{display:block;padding:16px 0 0}#overview .atlas-heading h1{font-size:25px;letter-spacing:.035em}#overview .atlas-heading .definition{font-size:12px;white-space:normal;margin-top:12px}.atlas-map{display:grid;grid-template-columns:minmax(0,1fr);height:auto;gap:30px;padding:20px 0 10px;margin-top:12px}.map-nebula{inset:0;filter:none;background:radial-gradient(ellipse at 50% 12%,#35496017,transparent 40%)}.map-wires{display:none}.core-link{position:relative;left:auto;top:auto;transform:none;width:190px;height:190px;justify-self:center;margin:9px 0 22px}.core-title{font-size:22px}.core-enter{display:none}.map-group,.map-observe,.map-derive,.map-gravity,.map-pursuit{position:relative;left:auto;right:auto;top:auto;bottom:auto;width:100%;min-height:0;padding:0 5px 0 22px}.map-group:before{content:'';position:absolute;left:2px;top:11px;bottom:-40px;border-left:1px solid #a4c5d31c}.map-group:last-child:before{bottom:0;border-left-style:dashed}.group-port,.map-observe .group-port,.map-pursuit .group-port{left:-22px;right:auto;top:9px}.map-topics a{font-size:15px;min-height:45px}.map-topics a>span{opacity:.6}.group-heading{padding-bottom:10px}.map-pursuit{padding-bottom:8px}.planned-topic{font-size:15px}.reserved-track{height:27px}.core-caption{font-size:10px}}
@media(prefers-reduced-motion:reduce){#overview *,#overview *:before,#overview *:after{transition:none!important}}
.map-pursuit:not(.is-planned) .map-topics:before{display:block}#knowledge-network[data-active=pursuit] [data-branch=pursuit]{stroke:#e7c58e91;filter:drop-shadow(0 0 3px #e7c58e35)}.map-pursuit .map-topics+.planned-topic{margin-top:13px}

/* Leave a clear passage between the right-hand branches for Chapter 3. */
@media(min-width:761px){.atlas-map:has(.chapter-bridge[data-target="3"]){height:max(620px,calc(100svh - 255px))}.atlas-map .chapter-bridge[data-target="3"]{top:46%}}