@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&family=Space+Mono:wght@400;700&display=swap');
:root{color-scheme:dark;--bg:#091716;--panel:#112422;--line:#2c4240;--muted:#aac1b8;--lime:#d4f580;--text:#f3f6e9}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:'Plus Jakarta Sans',sans-serif;font-size:16px}a{color:inherit;text-decoration:none}button{font:inherit}a:focus-visible,button:focus-visible{outline:3px solid var(--lime);outline-offset:6px}header{height:90px;display:flex;align-items:center;justify-content:space-between;max-width:1440px;margin:auto;padding:0 5%;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:14px;font-weight:700;font-size:22px;letter-spacing:-1px}.brand-mark{background:var(--lime);color:var(--bg);width:36px;height:36px;display:grid;place-items:center;font-size:26px;box-shadow:4px 4px 0 #426346}.brand span:last-child{color:var(--lime)}.nav{display:flex;align-items:center;gap:34px}.nav a{font-size:14px;color:var(--muted)}.nav a.active{color:var(--lime)}.course{font:12px 'Space Mono',monospace;border:1px solid var(--line);padding:9px 12px;color:var(--muted)}main{max-width:1440px;margin:auto;padding:42px 5% 24px}.eyebrow{font:12px 'Space Mono',monospace;text-transform:uppercase;letter-spacing:2px;color:var(--lime);margin:0 0 14px}.intro{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:28px}h1{font-size:clamp(36px,4.5vw,60px);font-weight:600;letter-spacing:-2.8px;line-height:1.04;margin:0}h1 em{font-style:normal;color:var(--lime)}.intro p{color:var(--muted);line-height:1.7;margin:0;max-width:340px;font-size:15px}.world{position:relative;height:540px;border:1px solid #48665a;border-radius:12px;overflow:hidden;background:#153b39}.world-art{position:absolute;width:100%;height:100%;object-fit:cover;object-position:center}.world:after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,#051c2520,#051c2500 55%,#061b1baa);pointer-events:none}.map-label{position:absolute;z-index:2;top:23px;left:25px;font:12px 'Space Mono',monospace;background:#0a2421d9;border:1px solid #5b7a67;padding:10px 14px;letter-spacing:1px}.map-corner{position:absolute;bottom:23px;left:25px;z-index:2;font:12px 'Space Mono',monospace;color:#eefcd1}.map-node{position:absolute;z-index:3;display:flex;gap:12px;align-items:center;transform:translate(-50%,-50%);padding:12px 18px 12px 12px;min-width:195px;background:#0b2422ee;border:1px solid #8cae86;border-radius:7px;box-shadow:0 5px 0 #04151390,0 10px 24px #03191660;transition:transform .2s,background .2s;font-family:'Space Mono',monospace}.map-node:hover{transform:translate(-50%,-56%);background:#203c30}.badge{display:grid;place-items:center;width:39px;height:41px;background:var(--accent,var(--lime));color:#122321;font:700 19px 'Space Mono',monospace}.map-node small{display:block;color:var(--accent,var(--lime));font:11px 'Space Mono',monospace;margin-bottom:4px;letter-spacing:1px}.map-node strong{font-size:18px}.node1{left:22%;top:68%;--accent:#dcf993}.node2{left:43%;top:40%;--accent:#94e2ec}.node3{left:66%;top:66%;--accent:#f7cd82}.node4{left:79%;top:24%;--accent:#d8b4ff}.below-map{display:flex;justify-content:space-between;color:var(--muted);font:12px 'Space Mono',monospace;padding:15px 0 27px;border-bottom:1px solid var(--line)}.level-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin:28px 0 38px}.level-mini{border-top:2px solid var(--accent);padding-top:16px;display:flex;gap:12px}.level-mini .number{font:14px 'Space Mono';color:var(--accent)}.level-mini h2{font-size:18px;margin:0 0 7px}.level-mini p{font-size:14px;color:var(--muted);margin:0;line-height:1.5}.level-mini:hover h2{color:var(--accent)}footer{max-width:1440px;margin:auto;padding:22px 5% 30px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:#829e94;font-size:12px}.breadcrumbs{font-size:14px;color:var(--muted);margin-bottom:30px}.breadcrumbs a{color:var(--lime)}.lesson-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:56px;margin-top:38px}.lesson-nav{display:flex;flex-direction:column;gap:7px;align-self:start;position:sticky;top:25px}.lesson-nav a{padding:13px 15px;border:1px solid transparent;color:var(--muted);font-size:14px}.lesson-nav a.active{border-color:#526545;background:#1b3227;color:var(--lime)}.lesson{max-width:850px;line-height:1.8;min-width:0}.lesson h2{font-size:25px;line-height:1.3;margin-top:35px}.lesson p{color:#d3e0d8;white-space:pre-line}.lesson a{color:var(--lime);text-decoration:underline;text-underline-offset:4px;overflow-wrap:anywhere}.lesson iframe{border:1px solid var(--line);width:100%;min-height:390px;border-radius:8px;margin:16px 0;background:#fff}.resource{display:block;border:1px solid var(--line);padding:16px 20px;border-radius:5px;margin:12px 0;background:var(--panel)}.next-row{display:flex;justify-content:space-between;gap:15px;margin:45px 0;border-top:1px solid var(--line);padding-top:24px}.next-row a{color:var(--lime)}.sublevels{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}.sublevels a{border:1px solid #799657;padding:12px 18px;color:var(--lime);background:#223321;border-radius:4px}.source-note{color:var(--muted);font-size:13px;margin:24px 0}.lesson img{max-width:100%;height:auto;border-radius:6px}.mobile-levels{display:none}@media(max-width:800px){header{height:74px}.nav{gap:15px}.course{display:none}.intro{display:block}.intro p{margin-top:18px;max-width:100%}main{padding-top:30px}.world{height:540px}.map-node{min-width:155px;padding:9px;gap:8px}.map-node strong{font-size:16px}.badge{width:31px;height:35px}.node1{left:25%;top:78%}.node2{left:38%;top:51%}.node3{left:70%;top:67%}.node4{left:72%;top:28%}.level-grid{grid-template-columns:repeat(2,1fr)}.lesson-layout{grid-template-columns:1fr;gap:15px}.lesson-nav{position:static;flex-direction:row;flex-wrap:wrap}.lesson-nav a{padding:8px}.lesson iframe{min-height:300px}.below-map{font-size:11px;gap:20px}footer{gap:20px}h1{letter-spacing:-1.5px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* Shared navigation and supplied lesson illustrations. */
header{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:24px;height:auto;min-height:90px;padding-top:14px;padding-bottom:14px}.brand{font-size:20px;letter-spacing:-.5px;min-width:0}.brand-mark{flex-shrink:0}.nav{justify-self:end;gap:22px}.course{font-size:14px;white-space:nowrap}.miro-button{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;flex-shrink:0;border-radius:12px;transition:transform .15s}.miro-button:hover{transform:translateY(-2px)}.miro-button img{display:block;width:52px;height:52px;object-fit:contain;border-radius:0}.results-link{display:flex;align-items:center;gap:18px;padding:0 0 20px;border-bottom:1px solid var(--line);margin-bottom:28px;font-weight:600}.lesson .lesson-figure{display:block;max-width:100%;max-height:560px;width:auto;height:auto;margin:20px auto 28px;object-fit:contain}.assignment{margin-top:32px;padding:20px 24px;border:1px solid #526545;border-left:4px solid var(--lime);border-radius:6px;background:#1b3227}.assignment h2{margin:0 0 12px}.assignment p{margin:0}
@media(max-width:1000px){header{gap:16px}.brand{font-size:17px}.nav{gap:14px}.brand-mark{display:none}}
@media(max-width:650px){header{grid-template-columns:minmax(0,1fr) auto;gap:12px}.brand{font-size:18px}.nav{grid-column:1 / -1;justify-self:stretch;justify-content:space-between}.course{display:inline-block}.miro-button{width:48px;height:48px}.miro-button img{width:46px;height:46px}.results-link{gap:12px}}

/* Function lesson: introduction, equal illustrations, and shared working area. */
.function-layout{grid-template-columns:180px minmax(0,1fr);gap:36px}.function-lesson{max-width:none}.immersion-intro{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:start}.lesson .immersion-intro>.lesson-figure{width:100%;height:auto;max-height:none;margin:0}.immersion-intro h3{margin-top:0;font-size:21px;line-height:1.4}.immersion-intro p{margin:12px 0}.immersion-types{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;margin-top:40px}.lesson .immersion-card>.lesson-figure{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;max-height:none;margin:0}.immersion-card h2{margin:20px 0 14px;font-size:23px}.immersion-card p{margin:0}.immersion-note{margin-top:32px;padding-top:12px;border-top:1px solid var(--line)}.practice-row{display:grid;grid-template-columns:minmax(0,2fr) minmax(260px,1fr);gap:28px;align-items:start;margin-top:32px}.board-panel{min-width:0}.board-panel h2{margin:0 0 16px;font-size:24px}.board-panel iframe{display:block;width:100%;height:520px;border:1px solid var(--line);border-radius:8px;background:#fff}.board-panel>a{display:inline-block;color:var(--lime);margin-top:12px}.practice-row .assignment{margin-top:44px;line-height:1.8}.practice-row .assignment h2{font-size:24px}.lesson>.lesson-figure{width:100%;height:360px;object-fit:contain;max-height:none}
@media(max-width:1000px){.function-layout{grid-template-columns:1fr;gap:20px}.function-layout .lesson-nav{position:static;flex-direction:row;flex-wrap:wrap}}
@media(max-width:700px){.immersion-intro,.immersion-types,.practice-row{grid-template-columns:1fr}.immersion-intro{gap:24px}.lesson .immersion-intro>.lesson-figure{max-height:400px;object-fit:contain}.practice-row .assignment{margin-top:0}.board-panel iframe{height:420px}.lesson>.lesson-figure{height:280px}}

/* The existing left navigation doubles as the player's vertical path. */
.lesson-nav,.function-layout .lesson-nav{display:flex;flex-direction:column;gap:0;position:sticky;top:25px}.lesson-nav .trail-level{position:relative;display:grid;grid-template-columns:50px minmax(0,1fr);align-items:center;gap:10px;min-height:76px;padding:8px 0;border:0;background:transparent}.trail-level:not(:last-child):after{content:'';position:absolute;left:24px;top:calc(50% + 24px);bottom:calc(-50% + 24px);width:2px;background:var(--line);pointer-events:none}.trail-marker{position:relative;display:grid;place-items:center;width:50px;height:50px;z-index:1}.trail-dot{width:12px;height:12px;border:2px solid #6b887e;border-radius:50%;background:var(--bg)}.piano-avatar{display:block;width:48px;height:48px;object-fit:contain;image-rendering:pixelated;border-radius:6px;outline:2px solid var(--lime);outline-offset:2px}.trail-text{padding:12px 8px;border:1px solid transparent;border-radius:5px;line-height:1.5}.active .trail-text{border-color:#526545;background:#1b3227;color:var(--lime)}.trail-level:hover .trail-text{color:var(--lime);background:#1b3227}.function-layout{grid-template-columns:230px minmax(0,1fr);gap:36px}.lesson>.board-panel{margin-top:32px}.lesson .board-panel iframe{height:520px;margin:0}.lesson .board-panel>a{margin-top:12px}
@media(max-width:1000px){.function-layout{grid-template-columns:200px minmax(0,1fr);gap:24px}}
@media(max-width:800px){.lesson-layout,.function-layout{grid-template-columns:1fr;gap:24px}.lesson-nav,.function-layout .lesson-nav{position:static;width:min(280px,100%);flex-direction:column}.lesson-nav .trail-level{min-height:66px}.lesson .board-panel iframe{height:420px}}

/* Tablet-first classroom use: readable content, persistent left path, touch targets. */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
.lesson,.immersion-intro>div,.immersion-card,.practice-row>*{min-width:0}
.lesson h2,.lesson h3,.lesson p,.assignment p{overflow-wrap:break-word}
.nav>a,.breadcrumbs>a,.next-row>a,.board-panel>a{display:inline-flex;align-items:center;min-height:44px}
.next-row{flex-wrap:wrap}
.lesson>iframe{aspect-ratio:16/9;height:auto;min-height:0}
.function-lesson{container-type:inline-size}
@container(max-width:600px){
 .immersion-intro,.immersion-types{grid-template-columns:minmax(0,1fr);gap:24px}
 .lesson .immersion-intro>.lesson-figure{width:100%;max-height:380px;object-fit:contain}
 .immersion-card h2{margin-top:16px}
}
@media(min-width:700px) and (max-width:1180px){
 header,main,footer{padding-left:4%;padding-right:4%}
 header{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:16px}
 .brand{font-size:18px;line-height:1.35}.brand-mark{display:none}
 .nav{gap:12px}.course{display:inline-block}
 main{padding-top:30px}
 .lesson-layout,.function-layout{grid-template-columns:180px minmax(0,1fr);gap:24px;margin-top:28px}
 .lesson-nav,.function-layout .lesson-nav{position:sticky;top:20px;width:100%;flex-direction:column}
 .lesson-nav .trail-level{grid-template-columns:50px minmax(0,1fr);gap:6px;min-height:76px}
 .trail-text{padding:12px 4px;font-size:14px}
 .lesson{font-size:17px;line-height:1.75}
 .results-link{gap:12px;line-height:1.5}
 .lesson .lesson-figure{max-width:100%}
 .level-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
 .world{height:500px}
 .board-panel iframe,.lesson .board-panel iframe{height:560px;height:clamp(440px,65svh,640px);min-height:440px}
}
@media(min-width:700px) and (max-width:1000px){
 .practice-row{grid-template-columns:minmax(0,1fr);gap:24px}
 .practice-row .assignment{order:-1;margin-top:0}
}
@media(hover:none) and (pointer:coarse){
 a,button{touch-action:manipulation}
 .map-node:hover{transform:translate(-50%,-50%)}
 .miro-button:hover{transform:none}
 .sublevels>a{min-height:48px;display:inline-flex;align-items:center}
 .level-mini{min-height:72px}
}
@media(max-width:699px){
 .lesson-layout,.function-layout{grid-template-columns:minmax(0,1fr)}
 .lesson-nav,.function-layout .lesson-nav{position:static;width:min(280px,100%)}
 .board-panel iframe,.lesson .board-panel iframe{height:440px;min-height:0}
}

/* An optional sidequest, separate from the four main levels. */
.nav .sidequest-link{min-height:48px;padding:10px 14px;border:1px solid #f7cd82;border-radius:6px;color:#f7cd82;white-space:nowrap;font-weight:600}.nav .sidequest-link:hover,.nav .sidequest-link[aria-current="page"]{background:#3c3322;color:#ffdfa2}.sidequest-node{left:20%;top:25%;--accent:#f7cd82;border-style:dashed;min-width:210px}.sidequest-title{max-width:100%;font-size:clamp(30px,4vw,52px);line-height:1.15;letter-spacing:-1px;overflow-wrap:break-word}.sidequest-empty{padding:24px;border:1px solid var(--line);border-radius:8px;align-self:start;background:var(--panel)}.sidequest-empty p{margin:0;color:var(--muted)}.sidequest-stop{margin-top:12px}.lesson-nav .trail-level:has(+.sidequest-stop):after{background:repeating-linear-gradient(to bottom,var(--line) 0 4px,transparent 4px 8px);bottom:calc(-50% + 12px)}
@media(min-width:651px) and (max-width:1100px){header{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);row-gap:8px}.nav{grid-column:1 / -1;justify-self:stretch;justify-content:flex-end;gap:16px}.nav>a:first-child{margin-right:auto}.course{display:inline-block}}
@media(max-width:800px){.sidequest-node{left:25%;top:25%;min-width:195px}.node4{top:30%}}
@media(max-width:650px){.nav{gap:10px;flex-wrap:wrap;justify-content:flex-end}.nav>a:first-child{margin-right:auto}.nav .sidequest-link{padding:10px 12px}.course{padding:9px 8px}.sidequest-node{left:32%;top:23%;min-width:180px}.node4{left:70%;top:40%}.node2{left:32%;top:56%}.node3{left:70%;top:70%}.node1{left:27%;top:84%}.map-corner{bottom:12px;font-size:11px}}

/* Spacious topic links for touch and keyboard navigation. */
.sidequest-topics{display:grid;grid-template-columns:minmax(0,1fr);gap:20px}.lesson .topic-button{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:96px;padding:24px;border:1px solid #f7cd82;border-radius:8px;background:#292a20;color:var(--text);text-decoration:none;font-size:20px;font-weight:600;line-height:1.5}.topic-button>span:first-child{min-width:0;overflow-wrap:break-word}.topic-button>span:last-child{color:#f7cd82;flex-shrink:0}.lesson .topic-button:hover{background:#3c3322}.topic-button:active{background:#3c3322}@media(max-width:699px){.lesson .topic-button{padding:20px;font-size:18px;min-height:88px}}

/* Guided tonality practice: readable scores and native touch controls. */
.tonality-lesson{max-width:none}.tonality-lesson h2{margin:0 0 12px}.roadmap-panel{border:1px solid var(--line);padding:24px;border-radius:8px;margin-bottom:36px;background:var(--panel)}.pdf-actions{display:flex;flex-wrap:wrap;gap:12px}.pdf-actions>a{display:inline-flex;align-items:center;min-height:48px;padding:8px 14px;border:1px solid #799657;border-radius:6px}.roadmap-preview{margin-top:18px}.roadmap-preview summary,.note-help summary{cursor:pointer;min-height:48px;padding:10px 0;color:var(--lime)}.roadmap-preview img{width:100%;height:auto;background:white}.tonality-exercise{min-width:0}.example-picker,.clue-picker,.exercise-actions{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.tonality-exercise button{font:inherit;min-height:48px;padding:10px 16px;border:1px solid #688277;border-radius:6px;background:#17332b;color:var(--text);cursor:pointer;line-height:1.4}.tonality-exercise button[aria-pressed="true"]{background:var(--lime);color:var(--bg);border-color:var(--lime)}.tonality-exercise button:disabled{opacity:.5;cursor:not-allowed}.tonality-exercise button:hover:not(:disabled){border-color:var(--lime)}.score-scroll{width:100%;overflow-x:auto;background:#fff;color:#111;border-radius:8px;padding:12px 4px;overscroll-behavior-x:contain}.score-scroll>svg{display:block;width:100%;min-width:650px;height:auto}.score-scroll .score-highlight{color:#126ad2;fill:#126ad2;stroke:#126ad2}.score-scroll .score-highlight *{fill:#126ad2;stroke:#126ad2}.note-help{margin:14px 0;border-bottom:1px solid var(--line)}.note-help p{font-size:16px}.exercise-progress,.conclusion-hint{font-size:15px;color:var(--muted)}.clue-picker button{flex:1 1 160px}.tonality-exercise fieldset{border:0;padding:0;margin:20px 0}.tonality-exercise legend{font-size:20px;font-weight:600;line-height:1.5;margin-bottom:14px}.answer-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.answer-option{display:flex;align-items:center;gap:12px;min-height:56px;padding:14px;border:1px solid var(--line);border-radius:6px;cursor:pointer;line-height:1.5}.answer-option:has(input:checked){border-color:var(--lime);background:#223b2a}.answer-option input{width:22px;height:22px;flex-shrink:0;accent-color:#badf69}.answer-feedback:not(:empty){padding:20px;border:1px solid var(--line);border-radius:8px;line-height:1.7}.answer-feedback.correct{border-color:#a1c86e}.answer-feedback.incorrect{border-color:#e5b467}.answer-feedback p{margin:8px 0 14px}.tonality-note{margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}.tonality-exercise .secondary-action{background:transparent}.tonality-lesson{container-type:inline-size}@container(max-width:600px){.answer-options{grid-template-columns:minmax(0,1fr)}.roadmap-panel{padding:18px}.clue-picker button{flex-basis:140px}}@media(max-width:699px){.score-scroll>svg{min-width:620px}.roadmap-panel{padding:16px}}

/* Independent notation overlays, anchored in the score's own coordinates. */
.score-help{display:flex;flex-wrap:wrap;gap:12px;margin:16px 0 8px}.score-help button{flex:1 1 220px}.score-help-key{font-size:14px;line-height:1.6;color:var(--muted)}.score-scroll .show-chord-names .chord-name-overlay{display:block!important}.score-scroll:has(.show-chord-names)>svg{min-width:850px}

/* Native audio controls for reliable tablet playback; no automatic playback. */
.score-audio{margin:20px 0;padding:18px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.score-audio h4{font-size:18px;margin:0 0 6px}.score-audio p{font-size:14px;margin:0 0 14px}.score-audio audio{display:block;width:100%;min-height:54px;margin-bottom:12px}.score-audio button{min-height:48px}

/* Interval practice: harmonic pairs, direct note entry, and ungraded listening. */
.interval-lesson{max-width:none;container-type:inline-size}.interval-lesson h2{font-size:25px;margin:24px 0 12px}.interval-lesson button{font:inherit;min-height:48px;padding:10px 16px;border:1px solid #688277;border-radius:6px;background:#17332b;color:var(--text);cursor:pointer;line-height:1.4}.interval-lesson button[aria-pressed="true"]{background:var(--lime);color:var(--bg);border-color:var(--lime)}.interval-lesson button:disabled{opacity:.5;cursor:not-allowed}.interval-modes,.note-editor-controls,.interval-listen,.feeling-options{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}.interval-modes button{flex:1 1 190px;font-weight:600}.interval-progress{font-size:15px;color:var(--muted)}.interval-score{display:block;width:100%;height:auto;border-radius:8px;background:white;-webkit-user-select:none;user-select:none;touch-action:manipulation}.interval-score[role="group"]{cursor:crosshair}.interval-result{padding:14px 18px;border:1px solid var(--line);border-radius:6px;font-weight:600;min-height:58px}.interval-lesson fieldset{border:0;padding:0;margin:24px 0}.interval-lesson legend{font-size:20px;font-weight:600;line-height:1.5;margin-bottom:12px}.interval-options{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:20px}.interval-options label{display:flex;align-items:center;gap:10px;padding:12px;min-height:56px;line-height:1.4;border:1px solid var(--line);border-radius:6px;cursor:pointer}.interval-options label:has(input:checked){background:#223b2a;border-color:var(--lime)}.interval-options input{width:20px;height:20px;flex-shrink:0;accent-color:#badf69}.interval-tip summary{min-height:48px;cursor:pointer;color:var(--lime);padding:12px 0}.interval-lesson .interval-feeling{padding:20px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.interval-feeling p{margin:8px 0 14px;font-size:16px}.feeling-options button{flex:1 1 160px}.interval-listen #audio-status{flex-basis:100%;font-size:14px}.interval-listen #audio-status:empty{display:none}.interval-listen button{min-width:130px}.interval-finish{padding:24px;border:1px solid #a1c86e;border-radius:8px}.next-interval{margin:4px 0 24px}.interval-feeling .listen-first{color:var(--muted);font-size:14px}@container(max-width:650px){.interval-options{grid-template-columns:repeat(2,minmax(0,1fr))}.note-editor-controls button{flex:1 1 130px}.interval-lesson .interval-feeling{padding:16px}}
/* Tritonus lesson: responsive notation and listening cards. */
.tritone-section{padding:24px 0 32px;border-bottom:1px solid var(--line)}.tritone-section:first-child{padding-top:0}.tritone-section h2{margin-top:10px}.tritone-section h3{font-size:20px;line-height:1.4}.tritone-lesson figure{margin:0;padding:16px;background:#173027;border:1px solid var(--line);border-radius:8px;min-width:0}.tritone-lesson figure img{display:block;width:100%;height:auto;background:white;border-radius:5px;margin:12px 0}.tritone-lesson figcaption{font-size:16px;line-height:1.5}.tritone-lesson audio{display:block;width:100%;min-width:0;margin-top:14px}.tritone-compare,.tritone-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:20px 0}.tritone-compare{grid-template-columns:1fr}.tritone-lesson .tritone-accent{border-color:#f7cd82}.tritone-lesson details{margin:18px 0;padding:12px 16px;background:var(--panel);border:1px solid var(--line);border-radius:6px}.tritone-lesson summary{min-height:48px;align-content:center;cursor:pointer;font-weight:600;line-height:1.5;color:var(--lime)}.tritone-octave{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:20px;margin:20px 0;border:1px solid #f7cd82;border-radius:8px}.tritone-octave span:nth-child(even){font-size:14px;color:var(--muted);border-bottom:2px solid #f7cd82;padding:12px 0}.tritone-octave strong{color:#f7cd82}.tritone-task{border-left:3px solid #f7cd82;padding:4px 20px;margin:24px 0}.tritone-sources li{margin:12px 0}.tritone-lesson>.topic-button{margin-top:24px}@container(min-width:850px){.tritone-compare{grid-template-columns:repeat(3,minmax(0,1fr))}}@container(max-width:600px){.tritone-pair{grid-template-columns:1fr}.tritone-octave{display:grid;grid-template-columns:1fr;text-align:center}.tritone-lesson figure{padding:12px}}

/* Five-level overworld */
.level-grid{grid-template-columns:repeat(5,minmax(0,1fr))}
.node1{left:20%;top:76%}.node2{left:42%;top:51%}.node3{left:69%;top:77%}.node4{left:73%;top:48%;--accent:#f5b4cb}.node5{left:78%;top:20%;--accent:#d8b4ff}
@media(max-width:1000px){.level-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.world{height:640px}.map-node{max-width:44%}.node1{left:25%;top:82%}.node2{left:27%;top:56%}.node3{left:74%;top:76%}.node4{left:72%;top:46%}.node5{left:72%;top:18%}.sidequest-node{left:25%;top:25%}}
@media(max-width:650px){.world{height:760px}.map-node{left:50%;width:calc(100% - 40px);max-width:330px;min-width:0}.node1{top:18%}.node2{top:32%}.node3{top:46%}.node4{top:60%}.node5{top:74%}.sidequest-node{top:88%}.map-corner{display:none}}
/* Analysis helpers */
.score-help{display:flex;flex-wrap:wrap;gap:10px}.show-melody-names .melody-name-overlay{display:inline!important}
.interval-feeling label[for=interval-emotion]{display:block;font-weight:700;margin-top:20px}.interval-feeling textarea{display:block;width:100%;box-sizing:border-box;margin-top:8px;padding:12px;border:1px solid #7e918b;border-radius:8px;font:inherit;background:#fff;color:#182b27}
.note-editor-controls{flex-wrap:wrap;gap:8px}.keyboard-section{margin-top:48px;padding-top:24px;border-top:1px solid #708b8040}.piano-scroll{overflow-x:auto;padding:4px 2px 16px;overscroll-behavior-x:contain}.piano-board{position:relative;height:200px;min-width:690px;width:100%;isolation:isolate;touch-action:none;-webkit-user-select:none;user-select:none}.piano-key{position:absolute!important;top:0;padding:0 3px!important;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:3px;touch-action:none;user-select:none;font:700 14px Arial,sans-serif!important;border-radius:0 0 6px 6px!important;min-width:0!important;-webkit-tap-highlight-color:transparent}.piano-key.white{width:calc(100% / 15);height:195px;background:#fff!important;color:#20352e!important;border:1px solid #61736b!important;padding-bottom:12px!important;z-index:1}.piano-key.black{width:calc(100% / 15 * .64);height:126px;background:#172c29!important;color:#fff!important;border:1px solid #091715!important;padding-bottom:12px!important;z-index:2}.piano-key.pressed{background:#afd768!important;color:#13261b!important}.piano-key:focus-visible{outline:3px solid #296ad6!important;outline-offset:-4px}.tritone-quiz-options{display:flex;flex-wrap:wrap;gap:10px}.tritone-quiz-score{max-width:560px;width:100%;display:block;margin:12px auto}.tritone-quiz-feedback{min-height:3em}.map-node.sidequest-node strong{font-size:clamp(14px,1.2vw,18px)}
.emotion-caption{margin-bottom:0;color:#74634a;font-size:14px;font-weight:700}.emotion-sharing{font-size:14px;line-height:1.5;color:#4f6058}.admin-entry{margin-top:24px;font-size:14px}.admin-entry a{text-decoration:underline}.response-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:16px;margin:18px 0}.response-toolbar select{max-width:100%;margin:8px;padding:10px;font:inherit;border:1px solid #79897e;border-radius:6px;background:white;color:#172b23}.response-list{display:grid;gap:18px}.response-card{padding:22px;border:1px solid #81938370;border-radius:10px;background:#fff}.response-card h2{margin:0;font-size:22px}.response-card blockquote{margin:14px 0;padding:14px 18px;border-left:4px solid #789d47;background:#edf3e5;white-space:pre-wrap;overflow-wrap:anywhere}.response-meta{font-size:14px;color:#526455}.response-tones{font-weight:600}.admin-responses button{padding:10px 14px;border:1px solid #627b53;border-radius:6px;background:#d4f580;color:#172b23;font:inherit;cursor:pointer}.admin-responses button:disabled{opacity:.5;cursor:default}
.admin-login{display:grid;gap:10px;max-width:360px}.admin-login label{font-weight:700}.admin-login input{width:100%;padding:12px;border:1px solid #758777;border-radius:6px;background:#fff;color:#172b23;font:inherit}.admin-login button{margin-top:8px}.admin-login input:focus-visible{outline:3px solid #718f3e;outline-offset:2px}
/* Sidequest is a compact secondary destination on the overworld. */
.world .map-node.sidequest-node{width:150px;min-width:0;max-width:calc(100% - 40px);padding:5px 9px;gap:0;box-shadow:0 3px 0 #04151370,0 5px 12px #03191640}
.world .sidequest-node .badge{display:none}
.world .sidequest-node small{font-size:10px;line-height:12px;letter-spacing:.8px;margin-bottom:2px}
.world .map-node.sidequest-node strong{display:block;font-size:14px;line-height:16px;font-weight:600}

/* Keep the fieldset title inside the listening card instead of on its border. */
.interval-feeling legend{float:left;width:100%;padding:0;margin:0 0 8px}.interval-feeling legend+*{clear:both}

/* Smartphone layout: keep lesson content and exercises above navigation chrome. */
@media(max-width:699px){
 main{padding:24px 4% 18px}
 .breadcrumbs{margin-bottom:18px;font-size:13px}
 .eyebrow{margin-bottom:10px}
 .sidequest-title{font-size:clamp(28px,9vw,38px);line-height:1.08}
 .lesson-layout,.function-layout{margin-top:24px;gap:0}
 .lesson-nav,.function-layout .lesson-nav{display:none}
 .lesson{width:100%;max-width:none}
 .lesson h2,.interval-lesson h2{font-size:22px;margin:20px 0 10px}

 .interval-modes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:14px 0}
 .interval-modes button{min-width:0;min-height:44px;padding:7px 8px;font-size:14px}
 .interval-lesson>p{margin:10px 0 12px;line-height:1.55}
 .note-editor-controls{margin:10px 0;gap:7px}
 .tone-controls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
 .tone-controls button{min-width:0;min-height:44px;padding:6px 5px;font-size:14px}
 .tone-controls button:last-child{grid-column:1 / -1;justify-self:start;padding-inline:12px}
 .accidental-controls{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:center}
 .accidental-controls>span{grid-column:1 / -1;font-size:14px;color:var(--muted)}
 .accidental-controls button{min-width:0;min-height:44px;padding:6px 4px;font-size:13px}
 .interval-score{margin-top:12px}
 .interval-result{min-height:0;padding:11px 13px;font-size:14px}
 .interval-listen,.feeling-options{gap:8px;margin:14px 0}
 .interval-listen button,.feeling-options button{min-width:0;min-height:44px;padding:7px 10px;font-size:14px}
 .interval-options{gap:8px}
 .interval-options label{min-height:48px;padding:9px;font-size:14px}
 .interval-lesson .interval-feeling{padding:14px}

 .tonality-exercise button{min-height:44px;padding:7px 10px;font-size:14px}
 .example-picker,.clue-picker,.exercise-actions{gap:7px;margin:14px 0}
 .clue-picker button{flex-basis:calc(50% - 4px)}
 .answer-option{min-height:50px;padding:10px}
 .tritone-section{padding:18px 0 24px}
 .tritone-lesson figure{padding:10px}
 .tritone-lesson audio{min-height:44px}
 .keyboard-section{margin-top:32px;padding-top:18px}
 .piano-scroll{margin-inline:-4%;padding-inline:4%;overflow-x:hidden}
 .piano-board{height:180px;min-width:0;width:100%}
 .piano-key.white{height:176px;padding-bottom:8px!important}
 .piano-key.black{height:112px;padding-bottom:8px!important}
 .piano-key{font-size:10px!important}
 .piano-key.black span+span{display:none}
}

@media(max-width:390px){
 .tone-controls{grid-template-columns:repeat(2,minmax(0,1fr))}
 .tone-controls button:last-child{grid-column:auto}
 .accidental-controls button{font-size:12px}
}

.tonality-supply-hint{margin:0 0 18px;padding:16px 18px;border:1px solid #bd995c;border-left:4px solid #f7cd82;border-radius:6px;background:#302c21;color:var(--text);line-height:1.6}.tonality-supply-hint strong{color:#f7cd82}.tonality-supply-hint p{margin:6px 0 0}

footer{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between}footer a{font-size:14px;color:var(--lime)}.legal{max-width:850px;font-size:1rem;line-height:1.8}.legal address{font-style:normal}.legal h3{margin-top:28px}

/* Short game-like transition between internal pages. */
body.is-loading{overflow:hidden}.loading-screen{position:fixed;inset:0;z-index:9999;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 50% 42%,#173b35 0,#091716 58%,#040c0b 100%);opacity:0;pointer-events:none;transition:opacity .12s ease}.loading-screen.active{opacity:1;pointer-events:auto}.loading-window{width:min(520px,100%);padding:34px 32px 30px;text-align:center;border:1px solid #7f9c78;border-radius:8px;background:#0b211fee;box-shadow:0 8px 0 #030b0a,0 24px 80px #0009;font-family:'Space Mono',monospace}.loading-window img{display:block;width:72px;height:72px;margin:0 auto 18px;image-rendering:pixelated;border-radius:7px}.loading-screen.active .loading-window img{animation:loader-hop .6s steps(2,end) infinite}.loading-kicker{margin:0 0 9px;color:#f7cd82;font-size:12px;letter-spacing:2px}.loading-window h2{margin:0;color:var(--text);font-size:clamp(18px,4.8vw,27px);line-height:1.35;letter-spacing:.4px}.loading-bar{height:18px;margin:26px 0 20px;padding:3px;border:1px solid #799087;background:#071311}.loading-bar span{display:block;width:0;height:100%;background:repeating-linear-gradient(90deg,var(--lime) 0 20px,#b1d763 20px 24px)}.loading-screen.active .loading-bar span{animation:loader-progress .6s steps(12,end) forwards}.loading-screen[hidden]{display:none}@keyframes loader-progress{to{width:100%}}@keyframes loader-hop{50%{transform:translateY(-7px)}}
@media(max-width:600px){.loading-window{padding:28px 20px 24px}.loading-window img{width:62px;height:62px}.loading-bar{margin:22px 0 18px}}
@media(prefers-reduced-motion:reduce){.loading-screen{transition:none}.loading-window img{animation:none}.loading-bar span{animation-timing-function:linear}}
html.is-loading{overflow:hidden}
.lesson-nav,.function-layout .lesson-nav{gap:14px}
.lesson-nav .nav-tile{position:relative;inset:auto;transform:none;width:100%;min-width:0;max-width:none;display:flex;align-items:center;gap:12px;padding:12px;border:1px solid #8cae86;border-radius:7px;background:#0b2422ee;color:var(--text)}
.lesson-nav .nav-tile:hover{transform:none;background:#203c30}
.lesson-nav .nav-tile.active{border-color:var(--accent);background:#203c30;color:var(--text);outline:2px solid var(--accent);outline-offset:2px}
.lesson-nav .nav-tile .badge{flex-shrink:0}
.lesson-nav .nav-tile>span:last-child{min-width:0;overflow-wrap:anywhere}
.lesson-nav .nav-tile strong{display:block;font-size:16px;line-height:1.4}
.lesson-nav .nav-sidequest{width:150px;max-width:100%;align-self:center;padding:5px 9px;border-style:dashed}
.lesson-nav .nav-sidequest strong{font-size:14px;line-height:16px}
@media(min-width:700px) and (max-width:1180px){.lesson-nav .nav-tile{gap:8px;padding:9px}.lesson-nav .nav-tile .badge{width:31px;font-size:16px}.lesson-nav .nav-tile strong{font-size:14px}}
/* Indeterminate animation: network progress cannot be measured as a percentage. */
.loading-screen.active .loading-bar span{width:32%;animation:loader-wait 1.1s ease-in-out infinite alternate}
.loading-bar{overflow:hidden}
@keyframes loader-wait{to{transform:translateX(212%)}}
@media(prefers-reduced-motion:reduce){.loading-screen.active .loading-window img,.loading-screen.active .loading-bar span{animation:none}.loading-screen.active .loading-bar span{width:100%}}