/* Interactive lesson: local styles, no changes to the shared course stylesheet. */
.sum-lab p{margin:12px 0;line-height:1.6}.sum-settings{display:grid;grid-template-columns:2fr 2fr 1fr;gap:12px;margin:18px 0 8px}.sum-settings label{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.9rem}.sum-settings input,.sum-settings select{width:100%;min-width:0;padding:10px;border:1px solid #cbd5e1;border-radius:7px;background:white;color:var(--text);font:inherit}.sum-presets{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0 20px}.sum-presets button{font:inherit;font-size:.85rem;padding:7px 10px;background:white;border:1px solid #cbd5e1;border-radius:7px;cursor:pointer}.sum-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px}.sum-layout h3{font-size:1rem;margin:0 0 10px}.sum-layout pre{margin:0;min-width:0}.sum-machine{background:#f8fafc;border:1px solid #dbe4ee;border-radius:10px;padding:16px;min-width:0}.sum-data-heading{font-size:.9rem;font-weight:650}.sum-tape{display:flex;flex-wrap:wrap;gap:7px;min-height:44px;margin:10px 0}.sum-token{display:flex;align-items:center;gap:5px;padding:8px 10px;border-radius:7px;background:white;border:1px solid #cbd5e1;font:600 15px var(--font-mono);transition:transform .35s,background .35s,border-color .35s}.sum-token.is-current{transform:translateY(6px);background:#dbeafe;border-color:#2563eb}.sum-token.is-consumed{background:#dcfce7;border-color:#86efac}.sum-token small{font:11px var(--font-sans,system-ui)}.sum-flow{color:#475569;text-align:center;font-size:.85rem;margin:8px 0 14px}.sum-registers{display:grid;grid-template-columns:1fr 1fr;gap:10px}.sum-register{padding:12px 8px;background:white;border:1px solid #cbd5e1;border-radius:8px;text-align:center}.sum-register span{display:block;font-size:.78rem;color:#475569}.sum-register strong{display:block;font:700 30px var(--font-mono);margin-top:8px;color:#1d4ed8}.sum-register.is-changing{animation:sum-pulse .55s ease}.sum-total-register.is-error{background:#fff1f2;border-color:#fda4af}.sum-equation{min-height:44px;padding:12px 4px;text-align:center;font:600 16px var(--font-mono);overflow-wrap:anywhere}.sum-progress{font-size:.85rem;color:#475569;text-align:center;margin-bottom:12px}.sum-output{padding:12px;background:#1e293b;color:#f8fafc;border-radius:8px}.sum-output span{font-size:.8rem;color:#cbd5e1}.sum-output pre{font:16px/1.5 var(--font-mono);color:#f8fafc;background:transparent;white-space:pre-wrap;padding:8px 0 0}.sum-lab .loop-active-line{border-left:3px solid #f59e0b}.sum-lab .loop-actions button:disabled{opacity:.5;cursor:default}.lesson-route{margin:20px 0}.lesson-route a{white-space:normal}.loop-micro pre{font:14px/1.6 var(--font-mono);white-space:pre-wrap;margin:12px 0}.loop-micro ol{padding-left:22px}.practice-extra{background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:16px;margin-top:20px}.practice-extra summary{cursor:pointer;font-weight:650}.practice-extra p{margin:12px 0}.quiz-question pre{font:14px/1.6 var(--font-mono);white-space:pre-wrap;margin:12px 0}.loop-code-lines>span{white-space:pre-wrap;overflow-wrap:anywhere}
.sum-lab{scroll-margin-top:180px}
@keyframes sum-pulse{0%{transform:scale(1)}45%{transform:scale(1.07);background:#fef3c7}100%{transform:scale(1)}}
@media(max-width:1100px){.sum-settings{grid-template-columns:1fr}.sum-layout{grid-template-columns:1fr}.sum-register strong{font-size:28px}}
@media(prefers-reduced-motion:reduce){.sum-token{transition:none}.sum-register.is-changing{animation:none}.sum-token.is-current{transform:none}}