.coverage-band{padding:1.5rem;border-radius:16px;background:#eef6f4;border:1px solid #cfe3dd}.coverage-band h2{font-size:1.55rem}.coverage-band p{margin:0;color:#526476}.visual-panel{margin:1.5rem 0 2rem;padding:1.5rem;border-radius:16px;background:linear-gradient(145deg,#f7fbfa,#eef4f9);border:1px solid var(--line);overflow:hidden}.visual-panel>h2{font-size:1.5rem;margin-bottom:1.2rem}.flow-diagram{display:flex;align-items:center;justify-content:center;gap:.5rem;flex-wrap:wrap}.flow-node{padding:.8rem 1rem;background:#fff;border:1px solid #bcd7d0;border-radius:10px;font-weight:900;text-align:center}.flow-arrow{color:var(--mint);font-size:1.5rem;font-weight:900}.mini-chart{height:220px;display:flex;align-items:flex-end;justify-content:center;gap:1rem;padding:1rem;border-left:2px solid #9aa9b8;border-bottom:2px solid #9aa9b8}.mini-bar{width:min(90px,24%);height:var(--h);display:flex;align-items:flex-start;justify-content:center;padding-top:.5rem;border-radius:8px 8px 0 0;background:var(--navy);color:#fff;font-size:.75rem;font-weight:900}.mini-bar.accent{background:var(--coral)}.mini-bar.mint{background:var(--mint)}.formula-card{margin:1rem auto;max-width:620px;padding:1.4rem;text-align:center;background:#fff;border:2px solid var(--gold);border-radius:14px}.formula-card strong{font:700 1.5rem Georgia}.responsive-table{width:100%;border-collapse:collapse;background:#fff}.responsive-table th,.responsive-table td{padding:.75rem;border:1px solid var(--line);text-align:left}.responsive-table th{background:var(--navy);color:#fff}.floor-plan{display:grid;grid-template-columns:1fr 1fr 1fr;grid-template-rows:110px 110px;max-width:620px;margin:auto;border:5px solid var(--navy);background:#fff}.floor-plan div{display:grid;place-items:center;border:1px solid #98aabb;font-weight:800}.floor-plan .classroom{grid-column:span 2;background:#e8f4ef}.bridge-options{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.bridge-choice{min-height:145px;padding:1rem;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer}.bridge-choice:hover,.bridge-choice.selected{border-color:var(--mint);box-shadow:0 0 0 2px var(--mint)}.bridge-shape{height:60px;margin:1rem 0;border-bottom:8px solid var(--navy);position:relative}.bridge-shape.truss:before{content:"△ △ △";position:absolute;inset:auto 0 0;text-align:center;color:var(--coral);font-size:2rem}.bridge-shape.arch{border:8px solid var(--navy);border-bottom:0;border-radius:100px 100px 0 0}.circuit-svg,.chart-svg{width:100%;max-width:700px;height:auto;display:block;margin:auto}.interactive-lab{margin:1rem auto 4rem;padding:2rem;border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}.interactive-lab h2{font-size:clamp(1.7rem,3vw,2.4rem)}.lab-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.lab-grid label{font-size:.8rem;font-weight:900}.lab-grid input,.lab-grid select{display:block;width:100%;margin-top:.35rem;padding:.7rem;border:1px solid var(--line);border-radius:8px}.lab-output{margin-top:1.2rem;padding:1rem;border-left:4px solid var(--mint);background:#eef8f5;font-size:1.1rem}.classroom-builder{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem;min-height:240px;padding:1rem;border:5px solid var(--navy);background:#f4f1e7}.classroom-item{display:grid;place-items:center;padding:.5rem;border-radius:6px;background:#dbe8f3;font-size:.75rem;font-weight:800;text-align:center}.classroom-controls{display:flex;gap:.5rem;flex-wrap:wrap;margin:1rem 0}.classroom-controls button,.sequence-list button{padding:.6rem .8rem;border:1px solid var(--line);border-radius:8px;background:#fff}.sequence-list{display:grid;gap:.5rem}.sequence-list button{text-align:left}.skill-visual{margin-bottom:1rem;padding:1.2rem;background:#fff;border:1px solid var(--line);border-radius:14px}.skill-row{display:grid;grid-template-columns:130px 1fr;gap:.7rem;align-items:center;margin:.6rem 0;font-size:.78rem;font-weight:800}.skill-track{height:9px;border-radius:99px;background:#e6ecef;overflow:hidden}.skill-track i{display:block;height:100%;width:var(--w);background:var(--mint)}.pathway-card{margin-top:1rem;padding:1.2rem;background:#fff;border:1px solid var(--line);border-radius:14px}.lesson-review-link{margin-top:1rem}.flashcard-preview{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.flashcard-preview article{padding:1rem;background:#fff;border:1px solid var(--line);border-radius:12px}.number-line{position:relative;height:85px;margin:2rem 1rem;border-top:4px solid var(--navy)}.number-line span{position:absolute;top:-12px;transform:translateX(-50%);text-align:center}.number-line span:before{content:"";display:block;width:2px;height:20px;margin:auto;background:var(--navy)}
@media(max-width:720px){.lab-grid,.bridge-options,.flashcard-preview{grid-template-columns:1fr}.interactive-lab{margin-left:1rem;margin-right:1rem;padding:1.25rem}.flow-diagram{align-items:stretch;flex-direction:column}.flow-arrow{transform:rotate(90deg);text-align:center}.skill-row{grid-template-columns:105px 1fr}.responsive-table{display:block;overflow-x:auto}.floor-plan{grid-template-columns:1fr 1fr}.floor-plan .classroom{grid-column:span 2}}