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var(--ease);gap:8px;display:grid}.situation-card .btn{justify-self:start}.explore-question{font-family:var(--font-display);align-items:flex-start;gap:14px;max-width:60ch;margin:0;font-size:1.25rem;font-weight:500;display:flex}.q-mark{background:var(--sol-fill);color:#1b2433;border-radius:50%;flex:none;place-items:center;width:1.8em;height:1.8em;font-weight:700;display:grid}.explore-second{gap:12px;margin-top:8px;display:grid}.insight{border-style:dashed}.insight.is-open{border-style:solid;border-color:var(--sol-fill);background:var(--sol-soft);animation:rise .35s var(--ease)}.insight p:last-child{margin-bottom:0;font-size:1.08rem}.merk{border-left:6px solid var(--sol-fill)}.merk p{max-width:72ch}.merk-formula{padding:8px 0;overflow-x:auto}.merk-steps{gap:4px;max-width:72ch;margin:0 0 .9em;padding-left:1.4em;display:grid}.merk-steps li::marker{font-family:var(--font-display);color:var(--sol);font-weight:700}.merk-fit{border-radius:var(--radius-sm);background:var(--sol-soft);padding:8px 12px;display:inline-block}.merk-formula .katex-display{text-align:left;margin:.4em 0}.merk-formula .katex{font-size:1.3em}.example{gap:14px;display:grid}.example h3{margin:0}.example-head{align-items:center;gap:20px;display:grid}.example-head.has-graph{grid-template-columns:auto minmax(0,320px);justify-content:start}@media (width<=720px){.example-head.has-graph{grid-template-columns:1fr}}.mistake{gap:8px;display:grid}.mistake p{border-radius:var(--radius-sm);margin:0;padding:10px 14px}.mistake-wrong{background:var(--bad-soft)}.mistake-wrong .mk{color:var(--bad);margin-right:4px;font-weight:800}.mistake-wrong .katex{text-decoration:line-through;-webkit-text-decoration-color:var(--bad);text-decoration-color:var(--bad)}.mistake-right{background:var(--good-soft)}.mistake-right .mk{color:var(--good);margin-right:4px;font-weight:800}.method-choice table{border-collapse:collapse;width:100%;margin:6px 0 12px}.method-choice td{border-bottom:1px solid var(--rule);vertical-align:top;padding:10px 12px}.method-choice tr:last-child td{border-bottom:0}.method-choice td:last-child{white-space:nowrap}.level-note{border-radius:var(--radius);border:1px dashed var(--rule);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 20px;padding:14px 18px;display:flex}.level-note p{margin:0}.check-intro{max-width:65ch;margin:0}.phase-nav{border-top:1px solid var(--rule);flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:36px;padding-top:20px;display:flex}.training{gap:20px;padding-top:32px;display:grid}.training h1{margin-bottom:.2em}.lead-sm{margin:0;font-size:1.08rem}.training-controls{gap:12px;display:grid}.kind-chips{flex-wrap:wrap;gap:8px;display:flex}.chip{border:1.5px solid var(--rule);background:var(--card);cursor:pointer;transition:all .15s var(--ease);border-radius:999px;padding:6px 14px;font-weight:600}.chip:hover{border-color:var(--ink)}.chip.is-on{background:var(--ink);color:var(--paper);border-color:var(--ink)}.training-note{border-radius:var(--radius-sm);background:var(--eq3-soft);margin:0;padding:10px 14px}.cheat{gap:18px;padding-top:32px;display:grid}.cheat-head{flex-wrap:wrap;justify-content:space-between;align-items:end;gap:16px;display:flex}.cheat-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}@media (width<=820px){.cheat-grid{grid-template-columns:1fr}}.cheat-card{border-top:5px solid var(--sol-fill);align-content:start;gap:6px;display:grid}.cheat-card h2{margin:0;font-size:1.2rem}.cheat-card p{margin:0;font-size:.97rem}.cheat-card .cheat-nr{color:var(--ink-faint);letter-spacing:.1em;text-transform:uppercase;font-size:.8rem;font-weight:700}.cheat-card .katex-display{text-align:left;margin:.3em 0;overflow:auto hidden}@media print{.cheat{padding-top:0}.cheat-grid{grid-template-columns:1fr 1fr;gap:8px}.cheat-card{padding:10px 12px;font-size:9.5pt}.cheat-card h2{font-size:11pt}}