*{box-sizing:border-box}body{margin:0;background:#f3f5f7;color:#172d40;font-family:Arial,sans-serif}.speech-shell{max-width:1240px;margin:32px auto;padding:0 24px}.lesson-heading h1{font-size:32px;margin:8px 0}.lesson-heading p{color:#526575}.lesson-heading>a,.reading-source a{color:#005a85}.lesson-layout{display:grid;grid-template-columns:170px minmax(0,1fr);gap:24px;margin-top:28px}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #c78a00;outline-offset:3px}#lesson-sections button{display:block;width:100%;text-align:left;border:0;background:none;border-radius:6px;padding:13px 10px;margin-bottom:5px;color:#28475e}#lesson-sections button[aria-current=true]{background:#00274c;color:white}.lesson-card{background:white;border:1px solid #d8e1e7;border-top:7px solid #00274c;border-radius:8px;overflow:hidden;min-height:540px}.card-heading{padding:20px 28px 0}.card-heading small{text-transform:uppercase;letter-spacing:1px;color:#526575}.card-heading h2{font-size:27px;margin:10px 0 18px}.subtabs{display:flex;gap:6px;padding:0 28px;border-bottom:1px solid #d9e1e8;flex-wrap:wrap}.subtabs button{background:none;border:0;border-bottom:4px solid transparent;padding:10px;color:#526575}.subtabs button[aria-current=true]{border-color:#ffcb05;color:#00274c;font-weight:bold}.card-body{padding:24px 28px;line-height:1.6}.card-body p{margin:0 0 16px}.lead{font-size:21px}.callout{background:#edf4f8;border-left:4px solid #006990;padding:15px 19px;margin:18px 0}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px}.fact{padding:15px;background:#f4f6f8;border-radius:6px;margin:10px 0}.fact strong{display:block;font-size:20px;color:#00274c}.lesson-navigation{display:flex;align-items:center;justify-content:space-between;margin:18px 0}.lesson-navigation button,.action{padding:10px 18px;border:1px solid #00274c;border-radius:5px;background:#00274c;color:white}.lesson-navigation button:disabled{opacity:.35;cursor:default}.reading-source{font-size:12px;color:#526575;line-height:1.6;margin:30px 0}.chips{display:flex;gap:6px;flex-wrap:wrap}.phoneme{font-size:21px;min-width:42px;padding:7px 11px;border:1px solid #c8d5df;background:white;border-radius:5px;color:#00274c}.phoneme[aria-pressed=true]{background:#00274c;color:white;border-color:#00274c}.inspector{background:#f4f7f9;border:1px solid #d6e0e7;border-radius:7px;padding:18px;margin-top:18px}.inspector h3{margin:0;font-size:23px}.inspector p{font-size:14px}.anatomy{width:100%;max-width:310px;display:block;margin:8px auto}.figure{margin:0}.figure img{width:100%;display:block}.figure figcaption{font-size:13px;color:#526575;margin:10px 0}.figure-context{max-width:300px;margin:auto}.figure-wrap{position:relative}.figure-overlay{position:absolute;border:1px solid transparent;background:transparent;color:transparent;padding:0}.figure-overlay:hover,.figure-overlay:focus-visible{border:2px solid #e5a900;background:#ffcb0533;color:#00274c}.figure-overlay[aria-pressed=true]{background:#ffcb0544;border:2px solid #e5a900}.figure-key{font-size:13px}.term{border:0;border-bottom:1px dashed #006990;color:#005a85;background:transparent;padding:0;font:inherit;cursor:help}.glossary{border:1px solid #c7dbe7;background:#eef6fb;padding:14px;min-height:82px;margin:12px 0}.toy-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.comparison{padding:12px;text-align:center;border:1px solid #d3dee7;border-radius:6px;background:#f6f8fa}.comparison.yes{background:#e3eff5;border-color:#006990}.comparison strong{font-size:25px;display:block}.psi-result{font-size:27px;font-weight:bold;color:#00274c;margin:18px 0}.choice{padding:8px 14px;border:1px solid #a6bccd;border-radius:5px;background:white;margin-right:8px}.choice[aria-pressed=true]{background:#00274c;color:white}.small{font-size:13px;color:#526575}.step-line{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:22px 0}.step-line span{padding:12px;background:#edf3f7;border-radius:6px}.legend-dot{display:inline-block;width:13px;height:13px;border-radius:50%;margin-right:6px;background:#e09b00}.figure-note{background:#fff7d9;padding:12px;margin-top:12px;font-size:14px}@media(max-width:760px){.speech-shell{padding:0 12px;margin:20px auto}.lesson-layout{grid-template-columns:1fr;gap:12px}#lesson-sections{display:flex;overflow:auto}#lesson-sections button{min-width:120px;margin:0}.two-col{grid-template-columns:1fr}.card-body{padding:18px}.card-heading{padding:18px 18px 0}.subtabs{padding:0 12px}.lesson-heading h1{font-size:26px}.toy-grid{grid-template-columns:repeat(2,1fr)}}
.matrix-spot{position:absolute;width:22px;height:22px;border-radius:50%;border:2px solid #00274c;background:#ffcb05;color:#00274c;font-weight:bold;line-height:16px;padding:0;transform:translate(-50%,-50%);font-size:16px;box-shadow:0 0 0 2px white}.matrix-spot:hover{transform:translate(-50%,-50%) scale(1.2)}

/* Figure 2 phoneme groups, retaining color when selected. */
.phoneme{color:var(--phoneme-color);border-color:var(--phoneme-color);font-weight:600;border-bottom-width:4px}
.phoneme[aria-pressed=true]{color:var(--phoneme-color);border-color:var(--phoneme-color);background:#f1f4f7;box-shadow:0 0 0 2px var(--phoneme-color)}
.reading-source{font-size:10px;margin-top:90px;padding-top:18px;border-top:1px solid #d8e1e7;line-height:1.5}
.audio-attribution{margin-top:12px}.audio-attribution summary{cursor:pointer}.audio-attribution p{margin:5px 0}

.phoneme-detail{display:grid;grid-template-columns:1fr;gap:12px}.articulation-detail{display:block;width:100%;max-width:840px;height:auto;margin:auto}

.figure-panel{max-width:650px;margin:0 auto 22px}.figure-brain{max-width:540px;margin-left:auto;margin-right:auto}.methods-with-brain{align-items:center}.response-window{margin:0 0 18px}.response-window img{width:100%;height:auto}

.figure-bc{max-width:570px}.psi-maximum{font-size:14px;font-weight:normal;display:inline-block}.d-region,.d-row-button{position:absolute;background:transparent;border:0;cursor:help;padding:0}.d-region:hover,.d-region:focus-visible{outline:2px solid #b78100;background:#ffcb051a}.d-row-button{color:transparent;cursor:pointer;z-index:2}.d-row-button:hover,.d-row-button:focus-visible,.d-row-button[aria-pressed=true]{background:#ffcb054d;outline:2px solid #b78100}.d-row-highlight{position:absolute;left:8.45%;width:81.1%;border:2px solid #d49b00;background:#ffcb0520;pointer-events:none;z-index:1}.d-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:14px}.d-controls select{font:inherit;padding:6px 10px}.d-tooltip{position:fixed;z-index:1000;background:#00274c;color:white;padding:18px 33px 18px 18px;border-radius:8px;box-shadow:0 4px 20px #0003;font-size:15px;line-height:1.5}.d-tooltip p{margin:0}.d-tooltip button{position:absolute;right:6px;top:3px;background:none;color:white;border:0;font-size:24px}.d-tooltip[hidden],.d-row-highlight[hidden]{display:none}

.figure2-panel{margin-bottom:20px}.panel-conclusion{margin:12px 0 0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

.feature-guide{margin-top:24px;border:1px solid #cad8e3;border-radius:8px;overflow:hidden}.guide-tabs{display:flex;flex-wrap:wrap;gap:4px;padding:10px;background:#edf3f7}.guide-tabs button,.guide-nav button,.example-switch button{border:1px solid #b6cad8;background:white;padding:8px 11px;border-radius:4px;color:#00274c}.guide-tabs [aria-current=true],.example-switch [aria-pressed=true]{background:#00274c;color:white}#guide-content{padding:20px}#guide-content h3{margin:0 0 16px;font-size:22px}.guide-nav{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;background:#f4f7f9;font-size:13px}.guide-nav button:disabled{opacity:.35;cursor:default}.feature-key{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.feature-key>div{background:#f4f7f9;padding:12px;border-radius:6px}.feature-key h4{margin:0 0 8px;font-size:14px;color:#526575}.feature-buttons{display:flex;gap:5px;flex-wrap:wrap}.feature-buttons button{background:white;border:1px solid #b6cad8;border-radius:4px;padding:5px 7px;color:#00274c}.feature-buttons [aria-pressed=true]{background:#ffcb05;border-color:#ba8800}.guide-detail{background:#edf4f8;padding:14px;margin-top:14px;border-radius:6px}.guide-detail p{font-size:14px;margin:6px 0 10px}.guide-detail .guide-relationship{margin:10px 0 0}.guide-sound-layout{display:grid;grid-template-columns:1fr;gap:12px}.guide-sound-layout .phoneme{font-size:18px;padding:4px 8px;min-width:37px}.feature-table-scroll{max-height:390px;overflow:auto;border:1px solid #cad8e3}.feature-table{border-collapse:separate;border-spacing:0;font-size:12px;min-width:1050px;width:100%}.feature-table th,.feature-table td{padding:7px 5px;border-bottom:1px solid #e1e8ed;text-align:center;white-space:nowrap}.feature-table thead{position:sticky;top:0;z-index:2;background:#eaf1f6}.feature-table th:first-child{position:sticky;left:0;background:#eef3f7;z-index:1}.feature-table button{border:0;background:none;font:inherit;color:#00274c;cursor:pointer}.feature-table tbody th button{font-size:19px;font-weight:bold}.feature-table td{color:#b5bec5}.feature-table .feature-present,.feature-table .feature-changing{color:#57758b}.feature-table tr.selected td{background:#fff8db}.feature-table tr.selected td.feature-present,.feature-table tr.selected td.feature-changing{background:#ffcb05;color:#00274c;font-weight:bold;box-shadow:inset 0 0 0 1px #c39100}.feature-table tr.selected th{background:#ffdf6a}.feature-row-guide{position:absolute;left:9.9%;width:78.7%;background:#ffcb0515;border:2px solid #b78100;pointer-events:none}.example-switch{display:flex;gap:8px;margin-bottom:12px}.profile-cells{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin-bottom:14px}.profile-cell{display:flex;justify-content:space-between;align-items:center;border:1px solid #d5dfe7;border-radius:3px;padding:4px;gap:4px}.profile-cell button{border:0;background:none;color:#29475e;font:inherit;font-size:14px}.profile-cell span{width:28px;height:25px;border:1px solid #d3dde5;flex-shrink:0}.profile-focus{border:2px solid #ba8800;background:#fff5ce}.matrix-select-area{position:absolute;left:11.125%;top:15.313%;width:88.375%;height:84.455%;cursor:crosshair}.matrix-row-line{position:absolute;left:11.125%;width:88.375%;background:#ffcb0522;border:2px solid #c38b00;pointer-events:none}.matrix-col-line{position:absolute;top:15.313%;height:84.455%;background:#13a0c922;border:2px solid #006d99;pointer-events:none}.matrix-row-line[hidden],.matrix-col-line[hidden]{display:none}.matrix-selection-tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:13px;margin:12px 0}.matrix-selection-tools label{display:flex;align-items:center;gap:5px}.matrix-selection-tools input{width:75px}.matrix-selection-tools input,.matrix-selection-tools select,.matrix-selection-tools button{font:inherit;border:1px solid #b5c7d5;border-radius:4px;padding:5px 7px;background:white}.matrix-selection-tools button{color:#00274c}@media(max-width:700px){.feature-key{grid-template-columns:1fr 1fr}.profile-cells{grid-template-columns:repeat(2,1fr)}#guide-content{padding:14px}.guide-nav{padding:10px}.guide-tabs button{font-size:12px}}

.guide-column-highlight{position:absolute;left:18.884%;width:.6%;top:10.945%;height:85.6%;border:2px solid #006d99;background:#13a0c933;pointer-events:none}
.lesson-layout>div,.lesson-card,.card-body,.feature-guide,#guide-content,.feature-table-scroll{min-width:0;max-width:100%}.feature-table-scroll{width:100%}@media(max-width:760px){.lesson-layout{grid-template-columns:minmax(0,1fr)}}

.phoneme-toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.phoneme-toolbar h3{margin:0}.phoneme-toolbar .action{padding:6px 12px}.phoneme-features{border:1px solid #ccdae4;background:white;border-radius:6px;padding:12px}.phoneme-features .feature-legend{font-size:12px;margin:0 0 10px;color:#526575}.phoneme-feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.phoneme-feature-grid h4{font-size:12px;text-transform:uppercase;letter-spacing:.4px;color:#526575;margin:0 0 5px}.phoneme-feature-tags{display:flex;gap:4px;flex-wrap:wrap}.feature-tag{font:inherit;font-size:13px;color:#637887;background:#f6f8fa;border:1px solid #d6e0e7;border-radius:4px;padding:4px 6px}.feature-tag.applies{background:#ffdf72;border-color:#ba8800;color:#00274c;font-weight:bold}.feature-tag.changing{background:#e7f3fa;border-color:#167dab;color:#00537a}.feature-complement{font-size:12px;color:#355669;padding:4px}.class-label-hit:hover,.class-label-hit:focus-visible{background:#ffcb0530;outline:2px solid #ba8800}@media(max-width:700px){.phoneme-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}

.d-select-area,.d-select-psi,.d-electrode-label{position:absolute;border:0;background:transparent;padding:0}.d-select-area,.d-select-psi{cursor:crosshair}.d-select-area:focus-visible,.d-select-psi:focus-visible{outline:1px dashed #006d99;outline-offset:1px}.d-electrode-label{cursor:default}.d-electrode-label::after{content:attr(data-hint);position:absolute;bottom:100%;left:50%;transform:translateX(-50%);white-space:nowrap;font-size:11px;line-height:1.2;color:#526575;opacity:0;pointer-events:none}.d-electrode-label:hover::after,.d-electrode-label:focus-visible::after{opacity:1}.d-column-highlight{position:absolute;top:11.061%;height:78.485%;border-left:1px solid #006d99;border-right:1px solid #006d99;background:#13a0c933;pointer-events:none;z-index:1}.d-column-highlight[hidden]{display:none}

.feature-key-only>h3{font-size:23px;margin:0;padding:18px 20px 0}.feature-key-only #guide-content{padding-top:14px}

.concept-check{border-top:1px solid #dce3e8;margin-top:22px;padding-top:16px}.concept-check h3{font-size:17px}.concept-check summary{cursor:pointer;color:#1b607c;font-weight:600}.future-brain img{max-height:390px;object-fit:contain}.future-brain figcaption{font-size:11px}

.paper-quote{margin:20px 0}.paper-quote h3{font-size:19px;margin-bottom:10px}.paper-quote blockquote{margin:0;border-left:3px solid #ffcb05;padding:4px 0 4px 16px;line-height:1.55}.paper-quote cite{display:block;font-size:11px;color:#667786;margin:8px 0 0 19px;font-style:normal}

.inner-tabs{display:flex;gap:8px;margin:20px 0 12px}.inner-tabs button{font:inherit;padding:9px 14px;border:1px solid #d3dfe6;border-radius:7px;background:#f5f8fa;cursor:pointer}.inner-tabs button[aria-selected="true"]{background:#00274c;color:white;border-color:#00274c}[role="tabpanel"][hidden]{display:none}.cluster-color-hit:hover,.cluster-color-hit:focus-visible{background:rgba(255,203,5,.12);outline:1px solid #667786}

body>.course-header{box-shadow:none!important}.speech-shell{margin-top:16px}.feature-row-guide{pointer-events:none;position:absolute;left:9.8%;right:1.5%;border:2px solid #e5a900;background:rgba(255,203,5,.15);z-index:3}

/* Final layout and interaction polish. */
.inner-tabs{flex-wrap:wrap}.inner-tabs button{min-height:42px;flex:0 1 auto}
#lesson-card{scroll-margin-top:16px}.feature-row-guide{right:auto}
@media(max-width:480px){.card-heading h2{font-size:23px;line-height:1.25}.card-body{padding:16px}.inner-tabs button{font-size:14px;padding:8px 10px}.inspector{padding:10px}.feature-buttons button{min-height:36px}.choice{margin-bottom:7px}.phoneme{min-width:38px}.comparison{padding:10px 5px;font-size:13px}}

.response-plot{position:relative}.gamma-axis-hit{position:absolute;left:.8%;top:28%;width:5.5%;height:48%;background:transparent;border:0;padding:0;cursor:pointer}.gamma-axis-hit:hover,.gamma-axis-hit:focus-visible{background:#ffcb0526;outline:2px solid #b78100;border-radius:5px}.gamma-dialog{width:min(1160px,96vw);max-width:96vw;max-height:94vh;margin:auto;padding:0;border:1px solid #c8d5df;border-radius:12px;box-shadow:0 16px 70px #001b3555;background:white;color:#19354a}.gamma-dialog::backdrop{background:#001b3599}.gamma-heading{display:flex;justify-content:space-between;align-items:center;padding:14px 22px;border-bottom:1px solid #dce5eb;position:sticky;top:0;background:white;z-index:2}.gamma-heading h3{margin:0;font-size:23px}.gamma-heading button{border:0;background:#eef3f7;border-radius:50%;font-size:28px;line-height:1;width:38px;height:38px;color:#00274c}.gamma-plot-scroll{overflow:auto;padding:12px}.gamma-plot-scroll img{display:block;width:100%;min-width:760px;height:auto}@media(max-width:600px){.gamma-heading{padding:12px 16px}.gamma-heading h3{font-size:20px}.gamma-axis-hit{left:0;width:8%}}

.gamma-plot-scroll img{width:min(100%,calc((94vh - 100px)*1.6923));margin:0 auto}