.section-intro{padding-top:4.5rem;padding-bottom:4.5rem}.intro-layout{display:grid;grid-template-columns:minmax(0,3fr)minmax(0,2.4fr);gap:var(--space-10);align-items:center}.intro-copy .intro-lead{font-size:var(--text-lg);color:var(--gray-600);max-width:34rem}.intro-actions{display:flex;flex-wrap:wrap;gap:var(--space-3);margin-top:var(--space-5);margin-bottom:var(--space-4)}.intro-meta{display:flex;flex-wrap:wrap;gap:var(--space-3)}.intro-panel{position:relative}.intro-panel-header{margin-bottom:var(--space-4)}.intro-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-4);margin-bottom:var(--space-4)}.intro-metric dt{font-size:var(--text-xs);text-transform:uppercase;letter-spacing:0.08em;color:var(--gray-500);margin-bottom:var(--space-1)}.intro-metric dd{font-weight:600;color:var(--gray-800)}.intro-panel-footer{font-size:var(--text-sm);color:var(--gray-600)}.section-header{max-width:44rem;margin:0 auto var(--space-8);text-align:left}.section-header-inline{display:flex;align-items:flex-end;justify-content:space-between;gap:var(--space-4)}.feature-list{display:flex;flex-direction:column;gap:0.55rem;font-size:var(--text-sm);color:var(--gray-700);margin-bottom:var(--space-3)}.feature-list.numbered{counter-reset:feat}.feature-list.numbered li{position:relative;padding-left:1.6rem}.feature-list.numbered li::before{counter-increment:feat;content:counter(feat)".";position:absolute;left:0;top:0;color:var(--color-primary);font-weight:600}.drawing-grid,.wheels-grid,.schemes-grid,.challenge-grid,.testing-grid,.mistakes-grid{gap:var(--space-8)}.drawing-card .card-header p,.section-challenges .card-header p{margin-bottom:0}.feature-figure{border-radius:16px;overflow:hidden;margin-bottom:var(--space-4)}.feature-figure img{width:100%;height:auto;display:block}.feature-figure-card{display:flex;flex-direction:column;gap:var(--space-3)}.feature-figure-card figcaption{font-size:var(--text-xs);color:var(--gray-500)}.physics-grid,.gallery-grid{gap:var(--space-6)}.comparison-layout{display:grid;grid-template-columns:minmax(0,2.4fr)minmax(0,3fr);gap:var(--space-6);align-items:stretch}.comparison-media img{width:100%;height:auto;border-radius:12px}.comparison-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-4)}.comparison-column h3{margin-bottom:var(--space-3)}.comparison-column p{font-size:var(--text-sm)}.masters-footer{display:flex;flex-wrap:wrap;gap:var(--space-3);margin-top:var(--space-4)}.next-steps{display:flex;align-items:center;justify-content:space-between;gap:var(--space-6)}.next-steps-copy{max-width:34rem}.next-steps-actions{display:flex;flex-wrap:wrap;gap:var(--space-3)}@media(max-width:960px){.intro-layout{grid-template-columns:1fr;gap:var(--space-8)}.comparison-layout{grid-template-columns:1fr}.comparison-media{order:-1}.section-intro{padding-top:3.5rem;padding-bottom:3.5rem}}@media(max-width:768px){.intro-grid{grid-template-columns:1fr}.section-header-inline{flex-direction:column;align-items:flex-start}.comparison-columns{grid-template-columns:1fr}.next-steps{flex-direction:column;align-items:flex-start}.next-steps-actions{width:100%}.next-steps-actions .btn{flex:1 1 auto}}@media(max-width:560px){.intro-actions{flex-direction:column;align-items:stretch}.intro-meta{flex-direction:column;align-items:flex-start}.section-header{margin-bottom:var(--space-6)}.gallery-grid,.physics-grid{grid-template-columns:1fr}.masters-footer{flex-direction:column;align-items:stretch}}