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14px;display:flex;flex-direction:column;z-index:20}.brand{color:white;text-decoration:none;display:flex;align-items:center;gap:12px;padding:0 6px 28px;font-size:1.6rem;letter-spacing:.01em}.brand strong{font-weight:400;color:var(--mint)}.brand small{display:block;font-size:.65rem;letter-spacing:.19em;color:#9daec8;margin-top:7px}.brand-icon{border:2px solid var(--mint);color:var(--mint);border-radius:4px 18px 18px 4px;padding:3px 9px;font-weight:700;font-size:1.6rem}.nav-tabs{display:flex;background:#223452;padding:4px;border-radius:10px;margin-bottom:22px}.nav-tabs button{width:50%;background:none;border:0;color:#adc0dc;font-size:.9rem;padding:9px}.nav-tabs button.active{background:#eef4ff;color:#18305c}.search-label{font-size:.85rem;color:#b6c6e0;display:block}.search-label input{background:#1b2f4f;border:1px solid #3a4d69;color:white;margin:8px 0 14px;padding:11px 12px;font-size:.85rem}.search-label input::placeholder{color:#95a7c3}.sidebar select{background:#1b2f4f;color:#dce8fb;border:1px solid #3a4d69;padding:8px;width:100%;border-radius:7px;margin-bottom:16px;font-size:.85rem}input,textarea{display:block;width:100%;padding:13px;border:1px solid #c5cfdf;border-radius:8px;margin:8px 0 16px;background:white;color:#14273f}textarea{min-height:110px;resize:vertical;font-family:inherit;line-height:1.5}#question-list{overflow:auto;flex:1;margin:0 -8px;padding:0 8px;scrollbar-width:thin;scrollbar-color:#435577 transparent}.chapter-label{font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;color:#95a9c9;margin:22px 9px 8px;font-weight:700}.question-nav{background:none;border:0;color:#c5d3e9;display:flex;width:100%;text-align:left;gap:10px;padding:11px 10px;margin:3px 0;font-weight:400;font-size:.88rem;line-height:1.35}.question-nav:hover{background:#243958;border:0}.question-nav.active{background:#2c446e;color:white;box-shadow:inset 3px 0 var(--mint)}.question-nav strong{font-weight:650;min-width:42px;color:#91a9cf}.question-nav.active strong{color:var(--mint)}.question-nav .status{margin-left:auto;color:var(--mint)}.side-footer{padding:16px 8px 0;font-size:.8rem;line-height:1.7;color:#b4c4dd}.side-footer span{font-size:.72rem;color:#8399bc}.stage{margin-left:292px}.topbar{height:83px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 38px;background:#fff;gap:20px}.topbar #breadcrumb{font-size:.74rem;letter-spacing:.12em;color:var(--muted);font-weight:700}.top-actions{display:flex;gap:8px}.top-actions button{font-size:.83rem;padding:9px 12px}.icon-button{background:transparent;border:0}.topbar #menu{display:none}#content{max-width:1460px;margin:auto;padding:35px 38px;display:grid;grid-template-columns:minmax(0,1fr) 315px;gap:25px;align-items:start}.question-card,.coach-card,.panel{background:#fff;border:1px solid var(--line);border-radius:15px;padding:30px;box-shadow:0 4px 16px #13233f04;min-width:0}.coach-card{padding:24px;position:sticky;top:22px}.eyebrow{font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;font-weight:750;color:var(--blue)}.question-meta{display:flex;align-items:center;justify-content:space-between;gap:10px}.badge{background:#eaf5f0;color:#15684d;font-size:.75rem;border-radius:20px;padding:6px 10px;font-weight:650}.part-tabs{display:flex;flex-wrap:wrap;gap:6px;border-bottom:1px solid var(--line);padding:6px 0 20px;margin:18px 0}.part-tabs button{min-width:38px;font-size:.85rem;padding:8px 10px}.part-tabs .active{background:var(--nav);color:white;border-color:var(--nav)}.part-tabs .completed{border-color:#218267;color:#126149}.part-tabs .active.completed{color:#58dfba}.part-tag{color:#60728c;font-size:.73rem;letter-spacing:.1em;font-weight:700}.problem-prompt{background:#f6f8fc;border-left:3px solid var(--blue);padding:18px 20px;margin:24px 0}.problem-prompt p:last-child{margin-bottom:0}.expression{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:1.45rem;letter-spacing:.04em}label{font-weight:600;font-size:.9rem}.primary{background:var(--blue);border-color:var(--blue);color:white;box-shadow:0 3px 6px #3155cc18}.primary:hover{background:#2648b8;color:white}.answer-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.muted,.hint{font-size:.85rem;color:var(--muted);line-height:1.6}.hint{font-weight:400}.locked{margin:24px 0;padding:19px;background:#f2f5fa;color:#536680;border-radius:8px;font-size:.9rem;line-height:1.6;border:1px dashed #cdd7e7}.coach-card p{font-size:.92rem;color:#52667f}.coach-card button{width:100%;margin:6px 0}.coach-card .link-button{border:0;background:none;color:#597093;font-weight:500;font-size:.82rem}.divider{height:1px;background:var(--line);margin:23px 0}.progress-rail{height:5px;background:#e9eef6;border-radius:5px;margin:16px 0 10px;overflow:hidden}.progress-rail i{display:block;height:100%;background:var(--blue)}.source-link{display:block;text-align:left;width:100%;background:#f8faff;border:1px solid #e2e8f2;margin:9px 0!important;padding:12px!important;font-size:.85rem;line-height:1.5}.source-link small{display:block;color:#56677d;font-weight:400}.feedback{margin:18px 0 0;padding:16px 18px;border-radius:8px;font-size:.9rem;line-height:1.6;border-left:4px solid #da9b25;background:#fff7e7;color:#6a4d13}.feedback.correct{background:#edf9f4;color:#11664b;border-left-color:#299f7f}.feedback.neutral{background:#eef3ff;color:#36558b;border-left-color:#6181d4}.walkthrough{margin-top:30px;border-top:1px solid var(--line);padding-top:24px}.step{padding:18px 0;border-bottom:1px solid #e8edf4}.step-title{display:flex;align-items:baseline;gap:12px}.step-number{background:#eaf0ff;color:var(--blue);font-size:.78rem;font-weight:700;border-radius:6px;padding:5px 9px}.step h3{margin:0;font-size:1rem}.step p{font-size:.95rem}.step details{background:#f4f7fc;border-radius:8px;margin-top:12px;padding:12px 15px}.step summary{cursor:pointer;color:var(--blue);font-weight:650;font-size:.85rem}.step details h4{font-size:.83rem;margin-bottom:8px}.step details p{font-size:.88rem}.solution-answer{background:#eaf8f2;border:1px solid #b6dfcd;border-radius:10px;padding:19px;margin-top:22px;line-height:1.6}.solution-answer .eyebrow{color:#137256}.next-actions{display:flex;gap:10px;margin-top:24px;justify-content:space-between}.figures{margin:22px 0}.figures figure{margin:14px 0;border:1px solid var(--line);border-radius:8px;padding:12px;background:white}.figures img{display:block;max-width:100%;max-height:580px;height:auto;margin:auto;cursor:zoom-in}.figures figcaption{font-size:.78rem;color:#56677d;margin-top:9px;line-height:1.5}img{max-width:100%;height:auto}table{border-collapse:collapse;font-size:.88rem;margin:16px 0;max-width:100%}td,th{border:1px solid #d9e2ee;padding:8px 10px;text-align:center}th{background:#eef3fa;font-weight:600}pre,code{font-family:ui-monospace,Consolas,monospace}pre{overflow:auto;background:#f3f6fc;border-radius:8px;padding:16px;font-size:.87rem;line-height:1.6}code{background:#edf2fa;padding:2px 4px;border-radius:3px}dialog{width:min(1100px,94vw);height:min(900px,93vh);border:1px solid #ccd7e9;border-radius:14px;padding:0;color:inherit;box-shadow:0 28px 100px #091c4a60}dialog::backdrop{background:#0f203b80;backdrop-filter:blur(3px)}dialog>header{display:flex;align-items:center;justify-content:space-between;padding:16px 22px;border-bottom:1px solid var(--line);height:70px}dialog h2{margin:0;font-size:1.1rem}#modal-body{height:calc(100% - 70px);overflow:auto;padding:26px}#modal-body.reader{padding:0;overflow:hidden}#modal-body iframe{width:100%;height:100%;border:0}.library-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.library-grid button{text-align:left;line-height:1.6;padding:20px}.library-grid small{display:block;font-weight:400;color:var(--muted)}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#183658;color:white;box-shadow:0 3px 20px #0003;padding:12px 20px;border-radius:9px;z-index:100;display:none;font-size:.9rem}.empty{padding:40px 0;color:var(--muted)}.tools-row{display:flex;gap:8px;margin:10px 0 15px;flex-wrap:wrap}.tools-row button{font-size:.8rem;padding:8px 11px}.scratch{border:1px solid #d0dbe9;border-radius:9px;background-image:radial-gradient(#d5deea 1px,transparent 1px);background-size:20px 20px;touch-action:none;width:100%;height:240px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}.stat{background:#f1f5fc;padding:20px;border-radius:9px}.stat strong{display:block;font-size:1.7rem;color:#2544a8}.stat small{color:#5f7292}.row{display:flex;gap:14px;align-items:center;flex-wrap:wrap}.review-note{padding:15px;background:#eff4ff;border:1px solid #d8e3fa;border-radius:8px;margin-bottom:22px;font-size:.9rem}.mode-badge{color:#a5550a;background:#fff3db}.exam-time{font-variant-numeric:tabular-nums;color:#9c4d04}.drill-options{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}.drill-options select{padding:10px;border:1px solid #ccd8e9;border-radius:7px}ul,ol{line-height:1.65;padding-left:23px}.question-card .table-wrap{overflow:auto}body.modal-open{overflow:hidden}@media(min-width:1600px){#content{grid-template-columns:minmax(0,1fr) 340px}}@media(max-width:1180px){.sidebar{width:250px;padding:25px 14px}.stage{margin-left:250px}.topbar{padding:0 24px}#content{padding:24px;grid-template-columns:minmax(0,1fr) 265px;gap:18px}.question-card{padding:24px}.coach-card{padding:18px}.topbar #breadcrumb{display:none}}@media(max-width:960px){#content{grid-template-columns:1fr}.coach-card{position:static}.topbar{height:70px}.question-card{order:0}.coach-card{order:1}.stage{min-width:0}h1{font-size:1.7rem}}@media(max-width:680px){.sidebar{transform:translateX(-100%);width:285px;transition:transform .2s}.sidebar.open{transform:translateX(0);box-shadow:0 0 0 100vw #0b203b65}.stage{margin-left:0}.topbar{padding:0 12px;gap:6px}.topbar #menu{display:block}.top-actions{gap:3px}.top-actions button{font-size:.72rem;padding:9px 7px}#content{padding:18px 12px;gap:15px}.question-card{padding:20px}.coach-card{padding:20px}.library-grid{grid-template-columns:1fr}.stats{grid-template-columns:1fr}h1{font-size:1.5rem}.expression{font-size:1.2rem}dialog{width:98vw;height:95vh}.question-meta{align-items:flex-start}.answer-row>button{flex:1}td,th{padding:6px}.next-actions button{font-size:.8rem}#modal-body{padding:18px}}
/* Signalcraft / Murmur identity */
:root{--nav:var(--mm-navy);--blue:var(--mm-amber-text);--mint:var(--mm-amber);--line:#dfe5ee}.brand{gap:12px;padding-bottom:26px}.brand img{width:44px;height:44px;flex:none}.wordmark{font-size:1.45rem;letter-spacing:-.04em;font-weight:720}.wordmark small{font-size:.6rem;letter-spacing:.12em;color:#98abc8}.brand strong{color:var(--mm-amber)}.primary{background:#173d77;border-color:#173d77}.primary:hover{background:#214c8c}.eyebrow{color:var(--mm-amber-text)}.question-nav.active{background:#253a5f;box-shadow:inset 3px 0 var(--mm-amber)}.question-nav.active strong{color:var(--mm-amber)}.progress-rail i{background:var(--mm-amber-strong)}.part-tabs .active{background:#183c72}.coach-card{box-shadow:none}.source-link{background:#f8f9fc}.signalcraft-footer{display:flex;align-items:center;gap:8px;padding:15px 8px 0;color:#acb9d2;text-decoration:none;font-size:.72rem}.signalcraft-footer img{width:18px;height:18px;flex:none}.signalcraft-footer b{color:#eef4ff}.signalcraft-footer em{color:var(--mm-amber);font-style:normal}.tool-nav{display:flex;gap:5px;flex-wrap:wrap;padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:25px}.tool-nav button{font-size:.83rem;padding:9px 12px;border:0;background:#eff3f8}.tool-nav button.active{background:#173d77;color:white}.tool-footer{display:flex;align-items:center;gap:8px;color:#758499;font-size:.78rem;border-top:1px solid var(--line);padding-top:18px;margin-top:35px}.tool-footer img{width:18px;height:18px;flex:none}.tool-heading{display:flex;justify-content:space-between}.tool-heading h2,#tool-body>h2{font-size:1.6rem}select{display:block;border:1px solid #c5cfdf;border-radius:8px;background:white;padding:12px;font:inherit;margin:8px 0 16px;color:#1b3054}.bit-cards{display:flex;gap:8px;margin:25px 0}.bit-card{width:12.5%;padding:12px 5px;border:1px solid #cbd8e9;background:#f5f7fc;border-radius:10px}.bit-card small{display:block;color:#607390;font-size:.8rem}.bit-card strong{display:block;font-size:1.8rem;margin:9px 0 2px;font-weight:500}.bit-card.on{background:#183b70;border-color:#183b70;color:white}.bit-card.on small{color:#bbcde7}.number-results{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:25px 0}.number-results>div{padding:18px 20px;background:#f1f5fb;border:1px solid #e2e9f3;border-radius:11px}.number-results small{display:block;font-size:.8rem;color:#536d92}.number-results strong{display:block;font-size:1.35rem;font-weight:550;font-family:ui-monospace,monospace;margin-top:8px;overflow-wrap:anywhere}.number-results .wide{grid-column:span 2}.tool-explain{padding:18px 20px;border:1px solid #dce4ef;border-radius:9px;margin:24px 0}.tool-explain summary{font-weight:600;cursor:pointer;color:#173e79}.tool-explain p{font-size:.94rem}.preset-row{display:flex;gap:6px;flex-wrap:wrap;margin:20px 0}.preset-row button{font-size:.82rem;padding:8px 12px}.preset-row .active{color:white;background:#193f79}.input-toggles{display:flex;align-items:center;gap:12px;margin:25px 0}.input-toggles button,.output-light{width:80px;padding:13px;border-radius:9px;background:#edf2fa;border:1px solid #d2dceb}.input-toggles strong,.output-light strong{display:block;font-size:1.6rem;margin-top:6px}.input-toggles .on{background:#fff0df;border-color:#df8037;color:#9b4713}.output-light{margin-left:auto;text-align:center}.output-light.on{background:#ebf6ee;border-color:#75a786;color:#17572d}.live-circuit{max-height:440px;width:100%;background:#f8faff;border:1px solid var(--line);border-radius:10px;padding:15px}.interactive-table{width:100%;cursor:pointer}.interactive-table tr:hover{background:#f7eddf}.interactive-table .active-row{background:#fbe8d6}.interactive-table .mismatch{box-shadow:inset 4px 0 #c44635;background:#fff1ed}.kmap-layout{display:grid;grid-template-columns:1fr 260px;gap:25px}.kmap{border:0;width:100%;table-layout:fixed}.kmap td{padding:3px;border:0}.kmap th{border:0;background:none;font-weight:500;font-size:.85rem}.kmap td button{width:100%;height:80px;position:relative;background:#f2f5fa;border:1px solid #cdd8e8;padding:5px}.kmap td small{position:absolute;left:8px;top:6px;font-size:.65rem;color:#4b5e7a}.kmap td strong{font-size:1.4rem;font-weight:500}.kmap td .cell-one{background:#eaf1fb;color:#173e78}.kmap td .selected{box-shadow:inset 0 0 0 3px #e77722;background:#fff0df}.kmap td .grouped{border-color:#397a57}.kmap td em{position:absolute;bottom:4px;right:7px;font-style:normal;font-size:.6rem;color:#23764e}.group-card{background:#eef7f2;border-radius:8px;padding:14px;margin:12px 0;font-size:.9rem}.group-card p{margin:7px 0}.group-card button{font-size:.7rem;padding:5px 8px}.packet{display:flex;gap:6px;margin:20px 0}.packet-bit{flex:1;text-align:center;border:1px solid #d1ddeb;border-radius:9px;background:#f2f6fc;padding:13px 5px}.packet-bit small{display:block;font-size:.65rem;letter-spacing:.04em;color:#617894}.packet-bit strong{display:block;font-size:1.55rem;margin-top:8px}.packet-bit.parity-bit{background:#e4edf9;border-color:#869ec3;margin-left:10px}.packet-bit.flipped{background:#ffe6d2;border-color:#dc7123;color:#9a3b0b}.timing-svg{width:100%;background:#f4f7fc;border-radius:10px;padding:15px}.timing-svg text{font-size:12px;fill:#4e6383;font-family:system-ui}.switch-control{background:#eef3fa;width:100%;padding:18px}.switch-control.on{background:#ffe9d2;color:#893e0b}.switch-diagram{margin:20px 0;background:#f8faff;border:1px solid #dce5f2;border-radius:11px;padding:10px}.switch-diagram svg{max-height:260px;width:100%}.switch-diagram text{font:14px system-ui;fill:#314e78}.drill-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.drill-grid button{text-align:left;padding:23px;background:#f7f9fd}.drill-grid strong{display:block;font-size:1rem}.drill-grid small{display:block;font-weight:400;color:#607592;margin-top:9px;line-height:1.5}.variant-bar{display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin:16px 0}.variant-bar button{font-size:.8rem;padding:8px 11px}.variant-label{font-size:.75rem;color:#965019}.sync-status-button{font-size:.75rem!important;border:0;background:#edf3fb;color:#355c8b}.sync-options{max-width:650px}.sync-options input[type=checkbox]{width:auto;display:inline;margin:0 9px 0 0}.sync-options label.checkbox{display:flex;align-items:center;font-weight:400;margin:16px 0}.sync-state{padding:16px 18px;background:#f0f5fc;border-radius:9px;line-height:1.6;margin:20px 0}@media(max-width:680px){.tool-nav{gap:4px}.tool-nav button{font-size:.75rem;padding:8px}.bit-cards{gap:4px}.bit-card{padding:10px 3px}.bit-card strong{font-size:1.4rem}.bit-card small{font-size:.65rem}.kmap-layout{grid-template-columns:1fr}.packet{gap:3px}.packet-bit strong{font-size:1.15rem}.packet-bit small{font-size:.5rem}.packet-bit.parity-bit{margin-left:3px}.number-results{gap:8px}.number-results>div{padding:13px}.number-results strong{font-size:1.1rem}.drill-grid{grid-template-columns:1fr}.top-actions #drills{display:none}}
.recommendation{display:flex;gap:18px;border:1px solid #dce5f1;border-radius:12px;padding:23px;margin:15px 0}.recommendation-number{width:34px;height:34px;flex-shrink:0;background:#eaf0fa;color:#1c447e;border-radius:50%;display:grid;place-items:center;font-weight:650}.recommendation h3{margin:10px 0}.recommendation p{font-size:.91rem;color:#536982;margin:10px 0}.recommendation small{display:block;color:#7989a0;margin:12px 0}.recommendation button{font-size:.85rem;padding:9px 13px}.topic-row{border-bottom:1px solid #e1e7f0;padding:18px 0}.topic-row>.badge{margin-left:10px}.top-actions #resources{font-size:.83rem}.top-actions{flex-wrap:wrap;justify-content:flex-end}@media(max-width:1180px){.top-actions button{font-size:.75rem;padding:8px}.topbar{padding:0 20px}}@media(max-width:680px){.topbar{height:auto;min-height:70px;padding:10px;align-items:center}.top-actions{gap:3px}.top-actions button{padding:7px;font-size:.73rem}.recommendation{padding:17px;gap:10px}.recommendation-number{width:26px;height:26px}.sync-options>img{max-width:100%!important}}

[data-zoom]:focus-visible{outline:3px solid #b87327;outline-offset:5px;border-radius:8px}

/* Engineering teaching panels share the existing tool typography and controls. */
.engineering-controls{display:flex;flex-wrap:wrap;gap:14px;align-items:end;margin:20px 0}.engineering-controls label{flex:1;min-width:130px;font-size:.88rem;font-weight:600}.engineering-controls select{display:block;width:100%;margin:8px 0 16px;padding:13px;border:1px solid #c5cfdf;border-radius:8px;background:#fff;color:#14273f}.engineering-controls>button{margin-bottom:16px}.engineering-bits{font-family:ui-monospace,monospace;overflow-wrap:anywhere;letter-spacing:.045em}.engineering-scroll{overflow-x:auto}.engineering-family-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.engineering-family-grid fieldset{min-width:0;border:1px solid var(--line);border-radius:10px;padding:15px}.engineering-family-grid legend{padding:0 5px;font-weight:650}.engineering-specs{display:grid;grid-template-columns:1fr 1fr;gap:8px}.engineering-specs label{font-size:.75rem}.engineering-specs input{margin:6px 0;padding:9px}.engineering-specs input[readonly]{background:#f1f4f9;color:#526580}.engineering-checks{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:18px 0}.engineering-checks>div{border-radius:9px;border:1px solid #c7dfd4;padding:15px;background:#eff8f2}.engineering-checks>.fail{border-color:#ecc6b5;background:#fff3eb}.engineering-checks small,.engineering-checks strong,.engineering-checks span{display:block}.engineering-checks strong{margin:9px 0;color:#286347}.engineering-checks .fail strong{color:#9e4820}.engineering-checks span{font-size:.78rem;line-height:1.5}.engineering-voltage{width:100%;max-height:235px;border:1px solid var(--line);border-radius:10px;background:#f6f9fd;margin:10px 0}.engineering-voltage text{font:12px system-ui;fill:#35516e}.tool-explain details{margin:10px 0;padding:8px 12px;border-left:2px solid #ccdaed}.tool-explain details summary{font-size:.88rem}.engineering-controls input:focus-visible,.engineering-controls select:focus-visible,.engineering-specs input:focus-visible{outline:3px solid #b87327;outline-offset:3px}@media(max-width:650px){.engineering-family-grid{grid-template-columns:1fr}.engineering-checks{grid-template-columns:1fr 1fr}.engineering-controls label{min-width:135px}.engineering-voltage{min-height:180px}}

/* Product attribution stays in document flow, never over study controls. */
.stage > .signalcraft-footer {
  justify-content: center;
  gap: 8px;
  max-width: 1460px;
  margin: 0 auto;
  padding: 0 20px 22px;
  color: #617087;
  font-size: .72rem;
}
.stage > .signalcraft-footer img { width: 18px; height: 18px; }
.stage > .signalcraft-footer b { color: #33445e; }
.stage > .signalcraft-footer em { color: #9a4a18; }

/* Compact tools preserve every input and keep the result beside its controls. */
.input-toggles { flex-wrap: wrap; }
.input-toggles > button, .input-toggles > .output-light { min-width: 44px; flex: 1; }
@media (max-width: 380px) {
  .input-toggles { gap: 5px; }
  .input-toggles > button, .input-toggles > .output-light { padding: 10px 4px; }
  .packet { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .packet-bit.parity-bit { grid-column: 1 / -1; margin-left: 0; }
}

/* Transparent product mark and understated company/creator hierarchy. */
.connection-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.connection-brand strong { font-size: 28px; letter-spacing: -.035em; }
.signalcraft-footer, .tool-footer { flex-wrap: wrap; }
.signalcraft-footer .company-name, .tool-footer .company-name { font-size: 12px; white-space: nowrap; }
.signalcraft-footer .creator-credit, .tool-footer .creator-credit { font-size: 10px; white-space: nowrap; color: #617087; }

/* Scope swaps hide the previous learner immediately; recovery remains outside
   the inert study surface when a device write or profile read fails. */
.profile-loading {
  position: fixed;
  inset: 25vh 1.5rem auto;
  max-width: 38rem;
  margin: 0 auto;
  padding: 1.5rem;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.profile-loading[hidden] { display: none; }

/* Question layout: keep identity, scratch work and submission visually separate.
   Natural wrapping supports long titles, zoom and narrow screens without clipping. */
.question-meta { flex-wrap: wrap; row-gap: 12px; }
.question-heading { margin: 20px 0 14px; }
.question-reference { display: block; color: var(--muted); font-size: .8rem; font-weight: 600; letter-spacing: .02em; margin-bottom: 9px; }
.question-heading h1 { margin: 0; font-size: clamp(1.5rem, 2.4vw, 2rem); font-weight: 650; line-height: 1.25; overflow-wrap: anywhere; text-wrap: balance; }
.question-intro { line-height: 1.6; }
.variant-bar { margin: 18px 0 20px; gap: 8px 12px; }
#answer-form > .hint { margin: 0 0 18px !important; }
#answer-form > input { margin-bottom: 8px; }
#working-details { margin: 20px 0; border: 1px solid var(--line); border-radius: 10px; background: #f8fafc; }
#working-details > summary { padding: 14px 16px; min-height: 48px; cursor: pointer; font-size: .9rem; font-weight: 600; line-height: 1.45; }
#working-details[open] { padding: 0 16px 16px; }
#working-details[open] > summary { margin: 0 -16px 12px; border-bottom: 1px solid var(--line); }
#working-details label { display: block; }
#working-details .tools-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 12px; }
#working-details .scratch { display: block; touch-action: none; }
.answer-row { margin-top: 8px; gap: 10px; }
.answer-row button, .next-actions button, .variant-bar button { min-height: 44px; line-height: 1.35; }
.next-actions { border-top: 1px solid var(--line); padding-top: 20px; }
button:focus-visible, summary:focus-visible, a:focus-visible { outline: 3px solid #9b6727; outline-offset: 3px; }
.topbar { height: auto; min-height: 83px; padding-top: 14px; padding-bottom: 14px; }
.top-actions { min-width: 0; }
.coach-card h2 { line-height: 1.35; }
.coach-card .locked { margin: 18px 0; }
.sync-options .tools-row { display: flex; gap: 10px; flex-wrap: wrap; }
.sync-options h2 { margin-top: 24px; }
.connection-brand { display: flex; align-items: center; gap: 10px; }
.connection-brand strong { font-size: 28px; letter-spacing: -.035em; }
.stage > .signalcraft-footer { gap: 7px; flex-wrap: wrap; }
.signalcraft-footer .company-name { font-size: 12px; white-space: nowrap; }
.signalcraft-footer .creator-credit { font-size: 10px; color: #617087; white-space: nowrap; }
@media (max-width: 680px) {
  .topbar { flex-wrap: wrap; gap: 10px; }
  .top-actions { width: 100%; justify-content: flex-start; gap: 6px; }
  .top-actions button { min-height: var(--touch); padding: 8px 10px; }
  .question-card, .coach-card { padding: 20px; }
  .question-meta .badge { font-size: .7rem; }
  .question-heading { margin-top: 18px; }
  .question-heading h1 { font-size: 1.55rem; }
  .problem-prompt { padding: 16px; }
  .answer-row > button { flex: 1 1 auto; }
  .coach-card { position: static; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

@media (max-width: 680px) {
  .topbar #breadcrumb { display: block; flex: 1; font-size: .72rem; }
  .topbar #menu { min-width: var(--touch); min-height: var(--touch); }
}

/* Keep the account flow at a reading width within the shared utility dialog. */
dialog:has(#account-panel){width:min(700px,96vw)}
dialog:has(#account-panel) #modal-body{padding:clamp(12px,2vw,22px)}

/* The utility dialog (#modal) is a fixed-height panel; other dialogs size to their content.
   fit-content, not auto: a modal dialog is inset top and bottom, so auto stretched the
   first-run reports prompt to the full screen height with an empty lower half. */
dialog.bug-report-dialog,dialog.diag-dialog{height:fit-content;max-height:calc(100dvh - 2rem)}
.diag-dialog{width:min(480px,94vw);padding:22px}
.diag-dialog label{display:grid;gap:6px;margin:12px 0}
.diag-dialog .row{margin-top:14px}
.signalcraft-footer.diag-on::after{content:"Testing mode on";margin-left:10px;padding:3px 9px;border-radius:99px;border:1px solid #3155cc;color:#3155cc;font-size:11px;font-weight:700}

/* Touch targets (master plan rule 4): 48 px on touch screens and phone/tablet
   widths. Desktop mouse layouts keep their compact controls. */
:root{--touch:var(--mm-touch)}
@media (pointer:coarse),(max-width:960px){
  button,select,summary,input:not([type=checkbox]):not([type=radio]):not([type=range]){min-height:var(--touch)}
  .part-tabs button{min-width:var(--touch)}
  .nav-tabs button{min-height:var(--touch)}
}

/* DIGI's Support & privacy panel (learning.js). Kept here, not in the shared
   bug-report-view.css, which must stay byte-identical to murmur-account/src. */
.support-settings-entry { width: 100%; margin-top: .5rem; padding: .55rem .7rem; background: transparent; border-color: #4b5e7d; color: #e2ebfa; text-align: left; font-size: .8rem; }
.support-settings-entry:hover { background: #243958; color: white; }
.support-settings-dialog { width: min(31rem, calc(100vw - 2rem)); height: fit-content; max-height: calc(100dvh - 2rem); padding: clamp(1rem, 3vw, 1.5rem); overflow: auto; border: 1px solid #d8e1ef; border-radius: 1.1rem; background: #fff; color: #172a43; box-shadow: 0 22px 75px #10243f55; }
.support-settings-dialog::backdrop { background: #07142a99; }
.support-settings-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.support-settings-head h2 { margin: 0; }
.support-settings-head button { padding: .45rem .7rem; }
.support-settings-body .bug-report-controls { font-size: .92rem; }
.source-status{list-style:none;padding:0;margin:8px 0 18px;display:grid;gap:6px}.source-status li{display:grid;grid-template-columns:22px 1fr;column-gap:6px;font-size:.88rem;line-height:1.4}.source-status li>span{font-weight:700;color:var(--muted)}.source-status li.ok>span{color:#15684d}.source-status li.unmatched>span{color:#9a5200}.source-status small{grid-column:2;color:var(--muted)}.source-status select{width:auto;display:inline-block;padding:4px 6px;margin:4px 6px}.source-missing{padding:18px;border:1px dashed #b8c4d6;border-radius:8px;background:#f6f8fc;text-align:center;font-size:.9rem}.source-missing p{margin:0 0 10px}
/* Settings: one panel for source files, account, offline use, backups and support. */
.settings-button{display:inline-flex;align-items:center;gap:6px;position:relative}.settings-button span{font-size:1.05em;line-height:1}.settings-button[data-account=ready]::after{content:"";position:absolute;top:6px;right:6px;width:7px;height:7px;border-radius:50%;background:#1f9d6c}
.settings-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:28px;align-items:start}.settings-tabs{display:flex;flex-direction:column;gap:4px;position:sticky;top:0}.settings-tabs button{text-align:left;border:0;background:transparent;color:#3c516e;font-weight:600;padding:11px 14px;min-height:44px;border-radius:8px}.settings-tabs button:hover{background:#eef3fa}.settings-tabs button.active{background:#173d77;color:#fff}.settings-panel{min-width:0;max-width:760px}.settings-panel>h3:first-child{margin-top:4px;font-size:1.3rem}.settings-panel:focus{outline:none}
.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;min-height:0!important;padding:0!important;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;padding:0;margin:0}
.file-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:8px;border:1px solid var(--line);background:#fff;font-weight:600;cursor:pointer;font-size:.92rem}.file-button.primary{background:#173d77;border-color:#173d77;color:#fff}.file-button.primary:hover{background:#214c8c}.file-button:focus-visible,.file-button:focus-within{outline:3px solid #b87327;outline-offset:3px}.file-button.busy{opacity:.6;pointer-events:none}
.source-drop{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:20px;border:2px dashed #c3cfe0;border-radius:12px;background:#f6f8fc;margin:16px 0 8px}.source-drop.over{border-color:#173d77;background:#eaf0fa}.source-drop .hint{margin:0}
.source-progress{min-height:1.6em;margin:6px 0 14px;font-size:.9rem;line-height:1.5}.source-progress.working{color:#173d77}.source-progress.done{color:#15684d;font-weight:600}.source-progress.warn{color:#8a4a00}.source-progress:empty{display:none}
.source-status li.source-summary{font-weight:650;margin-bottom:4px}.kept-file{display:inline-flex;align-items:center;gap:6px;margin:4px 10px 0 0;padding:4px 4px 4px 10px;border:1px solid var(--line);border-radius:20px;background:#fff}.kept-file .link-button{border:0;background:none;color:#a03a1a;padding:6px 10px;min-height:32px;font-size:.8rem}
.settings-callout{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:16px 18px;border:1px solid #d8e3fa;background:#eff4ff;border-radius:10px;margin-bottom:20px}.settings-callout p{margin:0;font-size:.92rem}.library-grid .source-ready::after{content:"✓ loaded";display:block;font-size:.75rem;font-weight:600;color:#15684d;margin-top:4px}
.source-missing .file-button{margin:2px 0 4px}.source-missing .hint{margin:8px 0 0}
dialog #toast{position:fixed;z-index:10}
@media(max-width:760px){.settings-layout{grid-template-columns:1fr;gap:16px}.settings-tabs{flex-direction:row;overflow-x:auto;position:static;padding-bottom:6px;border-bottom:1px solid var(--line);scrollbar-width:thin}.settings-tabs button{white-space:nowrap;flex:none;padding:10px 12px;font-size:.85rem}}
.tester-wrap{margin-top:28px;border-top:1px solid var(--line);padding-top:12px}.version-line{margin:0}.version-tap{border:0;background:none;padding:8px 0;min-height:44px;font-weight:400;font-size:.78rem;color:var(--muted);cursor:default}.version-tap:hover{background:none}.tester-area{margin-top:8px;padding:18px;border:1px solid #d8e3fa;border-radius:10px;background:#f6f9ff}.tester-area h4{margin:0 0 8px;font-size:1rem}.tester-area label{display:grid;gap:4px;margin:10px 0}.tester-area label input{margin:0}.tester-switch{display:flex!important;align-items:center;gap:10px;font-weight:600}.tester-switch input{width:44px;height:24px;margin:0;appearance:none;border-radius:99px;background:#c3cddc;position:relative;cursor:pointer;padding:0;border:0;flex:none}.tester-switch input::after{content:"";position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:left .15s}.tester-switch input:checked{background:#173d77}.tester-switch input:checked::after{left:23px}.tester-area .link-button{border:0;background:none;color:#a03a1a;font-weight:500}