/* Chapter 3 keeps the typography and network vocabulary of Chapters 1–2. */
.atlas-map{height:clamp(580px,calc(100svh - 270px),720px)}
.core-link{left:48%;top:43%;width:210px;height:210px}.core-caption{font-size:11px}
.map-gravity-elasticity{left:3%;top:4%;width:270px}.map-friction{right:3%;top:7%;width:270px}.map-newton{right:3%;top:49%;width:270px}.map-composition{left:3%;top:78%;width:270px}.map-equilibrium{right:3%;top:85%;width:270px}
.map-gravity-elasticity .group-port,.map-composition .group-port{left:auto;right:-16px}
.atlas-map .chapter-bridge[data-journey=previous]{top:48%;width:32%}
.planned-badge{font-size:10px;color:#8e9ca4;white-space:nowrap;margin-left:auto;letter-spacing:.04em}.map-topics a{white-space:normal}.is-planned .group-heading{padding-bottom:12px}
#knowledge-network[data-active=gravity-elasticity] [data-branch=gravity-elasticity],#knowledge-network[data-active=friction] [data-branch=friction],#knowledge-network[data-active=newton] [data-branch=newton]{stroke:#e7c58e91;filter:drop-shadow(0 0 3px #e7c58e35)}

/* Diagrams and facts carry the content; captions identify results and conditions. */
.topic-heading{margin-bottom:28px}.key-copy{padding-top:8px}.key-copy h2{margin-top:0}.key-copy p+p{margin-top:16px}
.diagram-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;margin:24px 0 30px;align-items:start}.diagram-card{min-width:0;padding:18px 16px 16px;border:1px solid var(--line);border-radius:3px;background:#12233116}.diagram-card h3{font-size:16px;color:var(--accent);margin:0 0 14px}.diagram-card figcaption{font-size:14px;color:#bdcbd1;line-height:1.8;margin:12px 0 0}.diagram-card p{font-size:14px;margin-top:14px;color:#bdcbd1}.diagram-grid>.diagram-card:only-child{grid-column:1/-1;max-width:520px;width:100%}.diagram text{font-size:19px}.diagram .tick{font-size:17px}.diagram .grid{stroke:#a4c5d32b}
.key-facts{margin:25px 0;padding:0}.key-facts>div{display:grid;grid-template-columns:100px minmax(0,1fr);gap:16px;padding:13px 0;border-bottom:1px solid var(--line)}.key-facts dt{font-weight:500;color:var(--accent)}.key-facts dd{margin:0}.key-facts>p{margin:12px 0}.key-facts>p strong{color:var(--accent)}.key-note{border-left:2px solid var(--accent);padding:8px 0 8px 18px;margin-top:26px;font-size:15px}.law-statement{font-size:18px;margin-bottom:25px}.law-statement strong{color:var(--accent)}.knowledge-list{padding-left:22px;margin:18px 0}.knowledge-list li{padding:3px 0 9px 3px}.analysis-steps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 30px;margin:0;padding-left:24px}.analysis-steps li{padding-left:5px}.analysis-steps strong{display:block;color:var(--accent);margin-bottom:5px}.analysis-steps span{font-size:14px}
.chapter-table{width:100%;border-collapse:collapse;text-align:left;font-size:15px}.chapter-table th,.chapter-table td{padding:15px 13px;border-bottom:1px solid var(--line);vertical-align:top}.chapter-table th{font-weight:500;color:var(--accent)}.chapter-table td{color:#c6d2d7}.table-scroll{overflow:auto;margin:25px 0}.comparison-table{table-layout:fixed}.comparison-table th:first-child{width:18%}.comparison-table .formula-trigger{font-size:23px;padding:5px 0}.comparison-table .formula-textbook .formula-math{padding:10px 12px}.display-math{overflow-x:auto;max-width:100%;margin:18px 0}.display-math .katex-display{text-align:left;margin:0}.formula-legend{margin-bottom:18px}.formula-rows{margin-bottom:24px}
/* Formula overview uses the shared Chapter 2 row layout and spacing. */
.handbook-heading{margin-bottom:18px}.handbook-content .formula-legend{margin-bottom:24px}
@media(min-width:1250px){.diagram-grid:has(>.diagram-card:nth-child(3):last-child){grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.diagram-grid:has(>.diagram-card:nth-child(3):last-child)>.diagram-card{padding:14px 10px}}
@media(min-width:761px) and (max-width:1050px){.atlas-map{height:690px}.core-link{left:47%;top:43%;width:166px;height:166px}.core-caption{font-size:9px}.map-gravity-elasticity{left:0;top:3%;width:210px}.map-friction{right:0;top:6%;width:210px}.map-newton{right:0;top:51%;width:210px}.map-composition{left:0;top:81%;width:230px}.map-equilibrium{right:0;top:89%;width:230px}.atlas-map .chapter-bridge[data-journey=previous]{top:49%;width:32%}.group-heading{gap:8px}.planned-badge{font-size:9px}.diagram-grid{gap:18px}.diagram-card{padding:14px 9px}.key-facts>div{grid-template-columns:88px minmax(0,1fr);gap:12px}}
@media(max-width:760px){.atlas-map{height:auto;gap:27px}.core-link{left:auto;top:auto;width:190px;height:190px}.map-gravity-elasticity,.map-friction,.map-newton,.map-composition,.map-equilibrium{position:relative;left:auto;right:auto;top:auto;bottom:auto;width:100%}.map-gravity-elasticity .group-port,.map-composition .group-port{left:-22px;right:auto}.atlas-map .chapter-bridge[data-journey=previous]{top:auto;width:100%}.map-equilibrium:before{bottom:8px}.planned-badge{font-size:10px}.diagram-grid{grid-template-columns:1fr;gap:20px}.diagram-card{padding:17px 12px}.key-facts>div{grid-template-columns:76px minmax(0,1fr);gap:12px}.chapter-table{font-size:14px}.chapter-table th,.chapter-table td{padding:12px 8px}.comparison-table th:first-child{width:19%}.comparison-table .formula-trigger{font-size:19px}.comparison-table .formula-textbook .formula-math{padding:8px}.law-statement{font-size:17px}.analysis-steps{grid-template-columns:1fr;gap:16px}.diagram-card figcaption{font-size:14px}.key-copy{padding-top:0}}

.force-intro{align-items:center}.force-intro .key-facts{margin:0}.force-intro .key-facts>div{grid-template-columns:76px minmax(0,1fr);padding:10px 0}