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90%,white);color:var(--muted);text-decoration:none;font-size:13px;font-weight:900;text-align:center}.stats{grid-template-columns:repeat(3,1fr);margin-top:18px}.section{padding-top:46px}.section-header{margin-bottom:18px}.stat:nth-child(2){border-right:1px solid var(--line)}.stat:nth-child(1),.stat:nth-child(2){border-bottom:0}.case-row,.tool-card,.pager,.trouble-map{grid-template-columns:1fr}.stage-head{grid-template-columns:46px 1fr;gap:14px;padding:18px}.stage-head span{width:46px;height:46px;border-radius:10px;font-size:14px}.stage-head h3{font-size:24px;line-height:1.25}.stage-head p{grid-column:2;margin-top:6px;font-size:15px}.lesson-row{min-height:0;grid-template-columns:42px 1fr;align-items:start;padding:18px}.lesson-row .dots{grid-column:2;margin-top:2px}.lesson-row .difficulty-badge{grid-column:2;justify-self:start;min-height:24px;margin-top:7px;padding:0 9px;font-size:11px}.lesson-row{align-items:start}.case-row{gap:5px}.tool-card img{width:100%;height:150px}.pager a{min-height:76px}}@media(max-width:480px){.hero-viz{margin-top:24px;padding:10px}.viz-toolbar{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.chip{min-width:0;padding:0 6px;font-size:12px;white-space:nowrap}.circuit-board{gap:16px;padding:10px;overflow:visible}.circuit-board:before{display:none}.circuit-node,.circuit-path{border-color:color-mix(in srgb,var(--ink) 18%,var(--line));background:color-mix(in srgb,var(--panel) 88%,white)}.circuit-node{grid-template-columns:28px 52px minmax(0,1fr);gap:8px;min-height:76px;padding:9px 10px}.panel-node:after,.circuit-path:after{content:"";position:absolute;left:50%;bottom:-12px;width:10px;height:10px;border-right:2px solid var(--green);border-bottom:2px solid var(--green);transform:translate(-50%) rotate(45deg)}.node-index{width:24px;height:24px;font-size:12px}.path-index{top:8px;left:10px;transform:none}.panel-visual,.lamp-visual{width:48px;height:48px;min-height:48px}.panel-visual{padding:8px}.panel-visual span{height:6px}.lamp-visual svg{width:24px;height:24px}.circuit-node strong{font-size:16px;line-height:1.25}.circuit-node small{font-size:12px;line-height:1.3}.circuit-path{gap:9px;padding:42px 10px 12px}.path-line{display:grid;grid-template-columns:74px minmax(0,1fr);min-height:26px;gap:10px;align-items:center}.path-line i{width:74px;height:9px}.path-line span{width:auto;font-size:12px;line-height:1.25}.switch-visual{justify-self:stretch;grid-template-columns:74px minmax(0,1fr);min-height:36px;padding:6px 0;border:0;background:transparent}.switch-visual b{justify-self:start}.fault-callout{margin-top:2px}.circuit-steps{grid-template-columns:1fr;gap:7px}.circuit-steps span{min-height:32px;justify-content:flex-start;padding:0 12px;text-align:left}.viz-foot{gap:7px}.status-pill{width:100%;justify-content:center}.legend-row{display:none}}