@font-face{font-family:Fredoka;font-style:normal;font-weight:500 600;font-display:swap;src:url(/fonts/fredoka/fredoka-latin.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Fredoka;font-style:normal;font-weight:500 600;font-display:swap;src:url(/fonts/fredoka/fredoka-latin-ext.woff2)format("woff2");unicode-range:U+104-107,U+118-119,U+141-144,U+15A-15B,U+160-161,U+178-17E,U+192,U+2C7,U+2DD}@font-face{font-family:Nunito;font-style:normal;font-weight:400 800;font-display:swap;src:url(/fonts/nunito/nunito-latin.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Nunito;font-style:normal;font-weight:400 800;font-display:swap;src:url(/fonts/nunito/nunito-latin-ext.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Noto Sans Symbols;font-style:normal;font-weight:400 800;font-display:swap;src:url(/fonts/noto-sans-symbols/noto-sans-symbols-accidentals.woff2)format("woff2");unicode-range:U+266D-266F;size-adjust:120%;ascent-override:84.25%;descent-override:29.4%;line-gap-override:0%}:root{--color-bg:#070a1a;--color-surface:#121634;--color-surface-deep:#0c1029;--color-text:#eaf0ff;--color-text-muted:#c3ccea;--color-text-subtle:#9aa5c8;--color-text-prose:#d7ddf3;--color-border:#eaf0ff24;--color-border-soft:#eaf0ff14;--color-control-border:#6b7499;--color-primary:#7cf3e3;--color-primary-strong:#b8fff5;--color-primary-tint:#152632;--color-on-primary:#070a1a;--color-secondary:#ffd27a;--color-secondary-strong:#ffe3a8;--color-secondary-tint:#2a2627;--color-secondary-text:#ffd27a;--color-comet:#9b8cff;--color-note-c:#ff5a5f;--color-note-d:#ff9f43;--color-note-e:#ffd27a;--color-note-f:#7be495;--color-note-g:#7cf3e3;--color-note-a:#5b8def;--color-note-b:#9b8cff;--spectrum:linear-gradient(90deg, var(--color-note-c), var(--color-note-d), var(--color-note-e), var(--color-note-f), var(--color-note-g), var(--color-note-a), var(--color-note-b));--color-success-bg:#0f2a22;--color-success-text:#86efac;--color-error-bg:#3a1420;--color-error-text:#fca5a5;--color-answer-border:#4d9693;--color-card-border:#9b8cff40;--color-key-white:#fffdf9;--color-key-white-edge:#e3dccd;--color-key-white-hover:#dcf7f2;--color-key-black:#2a2537;--color-key-black-edge:#17131f;--color-key-black-hover:#423a54;--color-key-label:#6e6580;--color-board:#f6f1e6;--color-mark:#0d9488;--color-mark-strong:#0a6f66;--color-mark-answer:#b7791f;--color-mark-answer-strong:#8a5a14;--radius-sm:10px;--radius-md:14px;--radius-lg:20px;--radius-pill:999px;--shadow-card:0 0 0 1px #eaf0ff12, 0 12px 28px -16px #000000b3;--shadow-card-hover:0 0 0 1px #7cf3e359, 0 16px 40px -18px #7cf3e359;--shadow-header:0 1px 0 #eaf0ff14;--font-cjk:"Hiragino Sans", "Hiragino Kaku Gothic ProN", "Apple SD Gothic Neo", "Yu Gothic UI", "Malgun Gothic", "Noto Sans CJK JP", "Noto Sans CJK KR";--font-system:system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, sans-serif;--font-sans:"Nunito", "Noto Sans Symbols", var(--font-cjk), var(--font-system);--font-display:"Fredoka", "Noto Sans Symbols", var(--font-cjk), var(--font-system);--tracking-display:0;--container-w:1080px}:root:lang(ja){--font-cjk:"Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo, "Noto Sans CJK JP", "Noto Sans JP"}:root:lang(ko){--font-cjk:"Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans CJK KR", "Noto Sans KR"}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;color-scheme:dark;background:var(--color-bg)}body{background:linear-gradient(90deg, transparent calc(50% - 30rem), var(--color-bg) calc(50% - 25rem), var(--color-bg) calc(50% + 25rem), transparent calc(50% + 30rem)) center 4rem / 100% 100% no-repeat, url(/images/starfield.svg) center top / 1440px auto no-repeat, var(--color-bg);color:var(--color-text);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;margin:0;line-height:1.55}::selection{color:var(--color-text);background:#7cf3e34d}:where(a,button,select,input,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}img,svg{max-width:100%}h1,h2,h3{font-family:var(--font-display);letter-spacing:var(--tracking-display);color:var(--color-text);overflow-wrap:break-word;font-weight:600;line-height:1.2}:root:lang(ja) :is(h1,h2,h3),:root:lang(ko) :is(h1,h2,h3){font-synthesis-weight:none;font-weight:800}p{margin:0 0 1em}a{color:var(--color-primary);text-decoration:none}.prose a{text-decoration:underline;text-decoration-color:color-mix(in srgb, currentColor 45%, transparent);text-underline-offset:3px}.prose a:hover{color:var(--color-primary-strong)}.container{max-width:var(--container-w);margin:0 auto;padding:0 1.25rem}.visually-hidden{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.site-header{z-index:20;-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-header);background:#070a1af0;position:sticky;top:0}@media (width<=767px){.site-header{position:static}}.site-header__inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;min-height:64px;padding-block:.6rem;display:flex}.wordmark{font-family:var(--font-display);align-items:center;gap:.6rem;font-size:1.35rem;font-weight:600;line-height:1;display:inline-flex}.wordmark__icon{color:var(--color-primary);flex-shrink:0}.wordmark__star{fill:var(--color-secondary)}.wordmark__text{color:var(--color-text);text-transform:lowercase}.site-nav{flex-wrap:wrap;align-items:center;gap:.25rem;display:flex}.site-nav a{border-radius:var(--radius-pill);min-height:44px;color:var(--color-text);align-items:center;padding:0 .95rem;font-weight:500;display:inline-flex}.site-nav a:hover{color:var(--color-text);background:#eaf0ff14}.lang-pill{margin-left:.35rem;display:inline-flex}.lang-pill select{appearance:none;border-radius:var(--radius-pill);border:1px solid var(--color-control-border);background:var(--color-surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath fill='%239aa5c8' d='M6 8 0 0h12z'/%3E%3C/svg%3E") no-repeat right .75rem center;min-height:44px;color:var(--color-text);font:inherit;cursor:pointer;background-size:10px 7px;padding:0 1.75rem 0 1rem;font-weight:500}.lang-pill select:hover,.lang-pill select:focus-visible{border-color:var(--color-primary)}.btn{border-radius:var(--radius-pill);cursor:pointer;border:none;justify-content:center;align-items:center;gap:.5rem;min-height:44px;padding:.7rem 1.6rem;font-family:inherit;font-size:1rem;font-weight:700;text-decoration:none;transition:transform .12s,box-shadow .12s,background-color .12s;display:inline-flex}.btn-primary{background:var(--color-primary);color:var(--color-on-primary);box-shadow:0 0 24px -6px #7cf3e373}.btn-primary:hover{background:var(--color-primary-strong);color:var(--color-on-primary);transform:translateY(-2px);box-shadow:0 0 32px -4px #7cf3e399}.btn-primary:active{transform:translateY(0);box-shadow:0 0 24px -6px #7cf3e373}.hero{text-align:center;max-width:720px;margin:0 auto;padding:3.5rem 1.25rem 3rem}.hero__eyebrow{color:var(--color-primary);text-transform:uppercase;letter-spacing:.08em;margin:0 0 .5rem;font-size:.85rem;font-weight:700}.hero__title{margin:0 0 .75rem;font-size:clamp(2rem,5vw,2.75rem)}.hero.hero--prism{text-align:left;max-width:none;margin:0;padding:0;position:relative;overflow:clip}.prism{aspect-ratio:2;width:171.43%;margin:-16.07% 0 -24.4% -71.43%;position:relative}.prism__light{pointer-events:none;width:100%;max-width:none;height:100%;display:block;overflow:visible}.prism__stars{fill:var(--color-text)}.prism__beam{stroke-width:3px;filter:drop-shadow(0 0 8px #ffffffe6)}.prism__band{opacity:1}.prism__band--c{fill:var(--color-note-c)}.prism__band--d{fill:var(--color-note-d)}.prism__band--e{fill:var(--color-note-e)}.prism__band--f{fill:var(--color-note-f)}.prism__band--g{fill:var(--color-note-g)}.prism__band--a{fill:var(--color-note-a)}.prism__band--b{fill:var(--color-note-b)}.prism__note{fill:var(--color-bg);font-family:var(--font-sans);font-size:30px;font-weight:800}@media (width>=420px){.prism__note{font-size:26px}}@media (width>=520px){.prism__note{font-size:22px}}@media (width>=640px){.prism__note{font-size:19px}}@media (width>=760px){.prism__note{font-size:16px}}.orbit-button{aspect-ratio:1;width:27.0833%;min-width:44px;color:inherit;cursor:pointer;background:0 0;border:0;border-radius:50%;padding:0;position:absolute;top:18.75%;left:50.6944%}.orbit-button:focus-visible{outline:3px solid var(--color-primary);outline-offset:4px}.orbit-button__art{width:100%;height:100%;display:block;overflow:visible}.orbit-button__fifth{fill:none;stroke:var(--color-text);stroke-width:4.3px;stroke-linejoin:round;filter:drop-shadow(0 0 10px #7cf3e399);transition:filter .2s,stroke .2s}@media (hover:hover){.orbit-button:hover .orbit-button__fifth{stroke:var(--color-primary-strong);filter:drop-shadow(0 0 18px #7cf3e3f2)}}.orbit-button.is-sounding .orbit-button__fifth{stroke:var(--color-primary-strong);filter:drop-shadow(0 0 4px #7cf3e3)drop-shadow(0 0 26px #7cf3e3f2)}.orbit-button.is-sounding .hero__orbit-star{filter:drop-shadow(0 0 16px #ffd27a)}.orbit-button__comet{fill:none;stroke:#fff;stroke-width:10px;stroke-linecap:round;stroke-linejoin:round;opacity:0;filter:drop-shadow(0 0 6px #fffffff2)drop-shadow(0 0 18px #7cf3e3e6)}@media (prefers-reduced-motion:reduce){.prism__band.is-lit{filter:brightness(1.35)drop-shadow(0 0 14px #ffffff8c)}}.hero__orbit-ring{fill:none;stroke:var(--color-comet);stroke-opacity:.14}.hero__orbit-octave{fill:none;stroke:var(--color-comet);stroke-width:.5px;stroke-dasharray:1.5 2.5}.hero__orbit-star{fill:var(--color-secondary);filter:drop-shadow(0 0 10px #ffd27acc)}@media (prefers-reduced-motion:no-preference){.orbit-button__fifth{stroke-dasharray:1;stroke-dashoffset:1px;animation:3.2s ease-in-out .3s forwards orbit-draw}@keyframes orbit-draw{to{stroke-dashoffset:0}}.orbit-button.is-sounding .orbit-button__art{animation:1.6s orbit-swell}@keyframes orbit-swell{0%{filter:drop-shadow(0 0 #7cf3e300);animation-timing-function:cubic-bezier(.2,.8,.3,1);transform:scale(1)}12%{filter:drop-shadow(0 0 28px #7cf3e3d9);animation-timing-function:cubic-bezier(.35,0,.25,1);transform:scale(1.06)}to{filter:drop-shadow(0 0 #7cf3e300);transform:scale(1)}}.orbit-button.is-sounding .orbit-button__comet{stroke-dasharray:.06 .94;animation:1.6s cubic-bezier(.3,.2,.4,1) orbit-comet}@keyframes orbit-comet{0%{stroke-dashoffset:0;opacity:0}6%{opacity:1}70%{opacity:1}to{stroke-dashoffset:-1px;opacity:0}}.prism__band.is-lit{animation:1.6s band-light}@keyframes band-light{0%{filter:brightness()drop-shadow(0 0 #fff0);animation-timing-function:cubic-bezier(.2,.8,.3,1)}10%{filter:brightness(1.5)drop-shadow(0 0 18px #ffffffb3);animation-timing-function:cubic-bezier(.35,0,.25,1)}to{filter:brightness()drop-shadow(0 0 #fff0)}}}.hero--prism .hero__text{z-index:1;max-width:var(--container-w);pointer-events:none;margin:0 auto;padding:.75rem 1.25rem 2.5rem;position:relative}.hero--prism .hero__text>*{pointer-events:auto}.hero__seal{border-radius:var(--radius-pill);color:var(--color-text-muted);text-wrap:balance;background:#070a1a99;border:1px solid #eaf0ff40;margin:0;padding:.35rem .9rem;font-size:.875rem;font-weight:700;display:inline-block}.hero__seal-part{white-space:nowrap}.hero--prism .hero__title{max-width:16ch;margin:1.25rem 0 1rem;font-size:clamp(2.5rem,4.6vw,4rem);line-height:1.05}.hero--prism .hero__intro{max-width:34rem;color:var(--color-text-prose);margin:0;font-size:clamp(1.125rem,1.5vw,1.3125rem);line-height:1.6}.hero__actions{flex-wrap:wrap;gap:.75rem;margin-top:1.75rem;display:flex}.hero__actions .btn{min-height:52px}.btn-ghost{color:var(--color-text);border:1.5px solid var(--color-answer-border);background:0 0;min-height:52px}@media (hover:hover){.btn-ghost:hover{border-color:var(--color-primary);color:var(--color-primary-strong)}}@media (width>=960px){.hero--prism{min-height:min(36vw,520px);container-type:inline-size}.prism{width:min(100%,1440px);margin:0;position:absolute;top:0;left:50%;transform:translate(-50%)}.prism__note{font-size:18px}.hero--prism .hero__text{padding:clamp(3.5rem,7vw,6.5rem) 1.25rem 4rem}.hero--prism .hero__text>*{max-width:min(27rem,45vw - 3rem)}.hero--prism .hero__text>.hero__actions{max-width:calc(50cqw - min(100cqw,1440px)/2 + min(100cqw,1440px)/1.9726 + -1*max(0px,50cqw - 540px) - 2.75rem)}.hero__actions .btn{padding-inline:1.2rem}}.spectrum-rule{background:var(--spectrum);height:4px}.mission{max-width:var(--container-w);margin:0 auto;padding:2.75rem 1.25rem 2.5rem}.mission__lead{max-width:52rem;color:var(--color-text);margin:0 0 1.75rem;font-size:clamp(1.25rem,2.2vw,1.625rem);font-weight:700;line-height:1.45}.pillars{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.25rem;margin:0;padding:0;list-style:none;display:grid}.pillar{border-radius:var(--radius-lg);background:var(--color-surface);padding:1.5rem}.pillar:before{content:"";background:var(--color-secondary);border-radius:2px;width:44px;height:4px;margin-bottom:.85rem;display:block}.pillar--aurora:before{background:var(--color-primary)}.pillar--comet:before{background:var(--color-comet)}.pillar__title{margin:0 0 .4rem;font-size:1.25rem}.pillar__text{color:var(--color-text-muted);margin:0;line-height:1.55}.paths{max-width:var(--container-w);flex-wrap:wrap;justify-content:center;align-items:center;gap:.75rem 1.5rem;margin:0 auto;padding:0 1.25rem;display:flex}.path-quiet{min-height:44px;color:var(--color-text-muted);text-decoration:underline;text-decoration-color:var(--color-border);text-underline-offset:3px;align-items:center;font-weight:600;display:inline-flex}.path-quiet:hover{color:var(--color-primary-strong);text-decoration-color:currentColor}.demo-card{background:var(--color-surface-deep);border:1px solid var(--color-card-border);border-radius:var(--radius-lg);max-width:720px;box-shadow:var(--shadow-card);color:var(--color-text);text-align:center;margin:2rem auto 0;padding:1.75rem 1.5rem}.demo-card__title{margin:0 0 .35rem;font-size:1.3rem}.demo-card__hint{color:var(--color-text-muted);margin:.75rem 0 0;font-size:.85rem}.hero--compact{padding:2.5rem 1.25rem 2rem}.hero__sub{max-width:560px;color:var(--color-text-muted);margin:0 auto}.practice-empty{max-width:560px;color:var(--color-text-muted);text-align:center;margin:0 auto 2rem;padding:0 1.25rem}.lesson-grid{max-width:var(--container-w);grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1.25rem;margin:0 auto;padding:0 1.25rem 3rem;list-style:none;display:grid}.catalog-group .lesson-grid{padding-bottom:1rem}.lesson-card{background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);padding:1.5rem;transition:transform .15s,box-shadow .15s;position:relative}.lesson-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-4px)}.lesson-card__badge{border-radius:var(--radius-sm);background:var(--color-primary-tint);min-width:2.5rem;height:2.5rem;color:var(--color-primary);justify-content:center;align-items:center;margin-bottom:.85rem;padding:0 .4rem;font-size:1.1rem;font-weight:800;display:inline-flex}.lesson-card:nth-child(2n) .lesson-card__badge{background:var(--color-secondary-tint);color:var(--color-secondary-text)}.lesson-card__title{margin:0 0 .4rem;font-size:1.15rem}.lesson-card__title a{color:var(--color-text)}.lesson-card__title a:after{content:"";border-radius:inherit;position:absolute;inset:0}.lesson-card:hover .lesson-card__title a,.lesson-card__title a:hover{color:var(--color-primary);text-decoration:underline}.lesson-card:focus-within{outline:3px solid var(--color-primary);outline-offset:3px}.lesson-card__title a:focus-visible{outline:none}.lesson-card__badge,.lesson-card__desc{position:relative}.lesson-card__desc{color:var(--color-text-muted);margin:0;font-size:.92rem;line-height:1.5}.site-main{padding-bottom:2rem}article.lesson,article.page{max-width:var(--container-w);margin:0 auto;padding:0 1.25rem}.prose{max-width:45rem;color:var(--color-text-prose);margin:0 auto;padding-top:2rem;font-size:1.1875rem;line-height:1.7}.prose strong,.prose b{color:var(--color-text)}.prose h1{margin:0 0 .75rem;font-size:clamp(2rem,4.5vw,3rem);line-height:1.12}.prose h2{margin:2.25rem 0 .75rem;font-size:clamp(1.5rem,2.6vw,1.875rem);line-height:1.2}.prose ul,.prose ol{padding-left:1.3rem}.prose li{margin-bottom:.4rem}.prose table{border-collapse:collapse;width:100%;margin:1.5rem 0;font-size:.95rem}.prose th,.prose td{text-align:left;border-bottom:1px solid var(--color-border);padding:.6rem .75rem}.prose th{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.03em;font-size:.85rem;font-weight:700}.note-figure{max-width:none;display:block}.lesson-figure{-webkit-overflow-scrolling:touch;margin:1rem 0;display:block;overflow-x:auto}.lesson-figure svg{flex-shrink:0;max-width:none;display:block}.lesson-figure.fretboard .hit{pointer-events:none;cursor:default}@media (width<=640px){.table-scroll{-webkit-overflow-scrolling:touch;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:linear-gradient(to right, var(--color-bg) 50%, transparent) left / 1rem 100% no-repeat local, linear-gradient(to left, var(--color-bg) 50%, transparent) right / 1rem 100% no-repeat local, radial-gradient(farthest-side at 0 50%, #eaf0ff59, transparent) left / .75rem 100% no-repeat scroll, radial-gradient(farthest-side at 100% 50%, #eaf0ff59, transparent) right / .75rem 100% no-repeat scroll;margin:1.5rem 0;overflow-x:auto}.prose table{font-size:.8125rem;line-height:1.45}.table-scroll>table{margin:0}.prose th,.prose td{white-space:normal;overflow-wrap:break-word;hyphens:auto;padding:.5rem .4rem}.prose th{font-size:.6875rem}:root:lang(ja) .prose table:not(:has(tr>:nth-child(6))) :is(th,td){min-width:4em}:root:lang(ko) .prose :is(th,td){word-break:keep-all}}.article-date{color:var(--color-text-subtle);margin:0 0 1.5rem;font-size:.9rem;display:block}.lesson-card .article-date{margin:.5rem 0 0;font-size:.8rem;position:relative}.glossary-eyebrow{color:var(--color-primary);letter-spacing:.04em;text-transform:uppercase;margin:0 0 .5rem;font-size:.9rem;font-weight:700;text-decoration:none;display:inline-block}.glossary-eyebrow:hover{text-decoration:underline}.prose .glossary-definition{border-left:4px solid var(--color-primary);border-radius:0 var(--radius-md) var(--radius-md) 0;background:var(--color-primary-tint);color:var(--color-text);margin:0 0 2rem;padding:1rem 1.25rem;font-size:1.3125rem;line-height:1.5}.glossary{max-width:45rem;margin:0 auto 3rem;padding:0 1.25rem}.glossary-letters{flex-wrap:wrap;gap:.25rem;margin:0 0 1.5rem;display:flex}.glossary-letters a{border-radius:var(--radius-sm);min-width:44px;min-height:44px;color:var(--color-primary);justify-content:center;align-items:center;font-weight:700;display:inline-flex}.glossary-letters a:hover{background:var(--color-primary-tint);color:var(--color-primary-strong)}.glossary-group{scroll-margin-top:1rem}.glossary-group__letter{color:var(--color-primary);margin:1.75rem 0 .75rem;font-size:1.5rem}.glossary-list{gap:.5rem;margin:0;display:grid}.glossary-entry{background:var(--color-surface);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:.85rem 1.1rem}.glossary-entry__term{font-weight:700}.glossary-entry__term a{color:var(--color-text)}.glossary-entry__term a:hover{color:var(--color-primary);text-decoration:underline}.glossary-entry__definition{color:var(--color-text-muted);margin:.3rem 0 0;font-size:.95rem;line-height:1.5}.progress-card{border-radius:var(--radius-lg);background:var(--color-primary-tint);color:var(--color-primary-strong);flex-wrap:wrap;align-items:baseline;gap:.75rem;margin:0 0 2rem;padding:1rem 1.25rem;display:flex}:root:not([data-progress=some]) .progress-card{display:none}.progress-card__streak{order:1}.progress-card__streak strong{font-size:1.6rem}.progress-card__label{order:2;margin:0;font-weight:700}.progress-card__total{color:var(--color-text-muted);order:3;margin:0 0 0 auto;font-size:.9rem}.progress-card__more{flex-basis:100%;order:4;margin:.25rem 0 0;font-size:.9rem}.progress-report{margin:0 0 3rem}.progress-invite,[data-progress-body]{display:none}:root[data-progress=none] .progress-invite,:root[data-progress=some] [data-progress-body]{display:block}.progress-invite{border-radius:var(--radius-lg);background:var(--color-primary-tint);color:var(--color-primary-strong);margin:0 0 1.5rem;padding:1.5rem}.progress-invite .btn{margin-top:1rem;display:inline-block}.progress-summary{flex-wrap:wrap;gap:1rem;margin:0 0 2.5rem;display:flex}.progress-summary__item{border-radius:var(--radius-lg);background:var(--color-primary-tint);color:var(--color-primary-strong);flex:8rem;min-height:93px;margin:0;padding:1rem 1.25rem}.progress-summary__item strong{min-height:39px;font-size:1.6rem;display:inline-block}.progress-summary__label{font-size:.85rem;display:block}.progress-block{margin:0 0 2.5rem}.progress-block__title{margin:0 0 1rem;font-size:1.25rem}.progress-block__empty{color:var(--color-text-muted);margin:0}.trend-list,.stale-list{margin:0;padding:0;list-style:none}:root[data-progress=some] .trend-list{min-height:calc(var(--trend-rows,0) * 135px + var(--trend-bars,0) * 20px)}:root[data-progress=some] .stale-list{min-height:calc(var(--stale-rows,0) * 58px)}.trend{border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);margin:0 0 1.25rem;padding:1rem 1.25rem}.trend__name{margin:0 0 .35rem;font-size:1.05rem}.trend__verdict{background:var(--color-border-soft);color:var(--color-text-muted);border-radius:999px;margin:0 0 .75rem;padding:.1rem .6rem;font-size:.8rem;display:inline-block}.trend__verdict--up{background:var(--color-success-bg);color:var(--color-success-text)}.trend__verdict--down{background:var(--color-error-bg);color:var(--color-error-text)}.trend__sessions{margin:0;padding:0;list-style:none}.trend__session{align-items:center;gap:.5rem;margin-bottom:.2rem;display:flex}.trend__track{background:var(--color-border-soft);border-radius:999px;flex:auto;height:.6rem;overflow:hidden}.trend__fill{background:var(--color-primary);border-radius:999px;height:100%;display:block}.trend__value{text-align:right;color:var(--color-text-muted);font-variant-numeric:tabular-nums;flex:0 0 3ch;font-size:.8rem}.stale{border-bottom:1px solid var(--color-border-soft);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:.5rem;padding:.75rem 0;display:flex}.stale__when{color:var(--color-text-muted);font-size:.85rem}.progress-report__note{color:var(--color-text-muted);margin:2rem 0 0;font-size:.9rem}.drill-list{margin:0;padding:0;list-style:none}.drill__label{margin:0 0 .25rem;font-size:1.15rem}.drill__best{color:var(--color-text-muted);margin-bottom:.75rem;font-size:.85rem;display:block}.game-card,.custom-panel__slot:not(:empty){background:var(--color-surface-deep);border:1px solid var(--color-card-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);color:var(--color-text);margin:2rem 0;padding:1.75rem 1.5rem;font-size:1.05rem;line-height:1.55}.ad-container{max-width:728px;margin:2rem auto}.site-footer{background:var(--color-surface-deep);border-top:1px solid var(--color-border-soft)}.site-footer__inner{color:var(--color-text-muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;padding-block:1.75rem;font-size:.9rem;display:flex}.site-footer__brand{color:var(--color-text);font-family:var(--font-display);text-transform:lowercase;margin:0;font-weight:600}.site-footer__links{flex-wrap:wrap;gap:1.25rem;display:flex}.site-footer__links a{min-height:44px;color:var(--color-text-muted);align-items:center;font-weight:600;display:inline-flex}.site-footer__links a:hover{color:var(--color-primary);text-decoration:underline}.consent-banner{display:none}:root[data-consent=unset] .consent-banner{inset-inline:0;z-index:20;background:var(--color-surface);border-top:1px solid #7cf3e340;display:block;position:fixed;bottom:0;box-shadow:0 -12px 32px -12px #000000b3}:root[data-consent=unset] .site-footer__inner{padding-bottom:8rem}.consent-banner__inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem 1.5rem;padding-block:1rem;display:flex}.consent-banner__text{max-width:46rem;margin:0;font-size:.95rem}.consent-banner__actions,.consent-prefs__actions{flex-wrap:wrap;align-items:center;gap:.75rem;display:flex}.consent-banner__btn,.consent-prefs__btn{border-radius:var(--radius-pill);border:2px solid #0000;min-height:44px;padding:.7rem 1.5rem;font-size:1rem;font-weight:700}.consent-banner__btn--accept,.consent-prefs__btn--on{background:var(--color-primary);color:var(--color-on-primary);border-color:var(--color-primary)}.consent-banner__btn--accept:hover,.consent-prefs__btn--on:hover{background:var(--color-primary-strong);border-color:var(--color-primary-strong)}.consent-banner__btn--decline,.consent-prefs__btn--off{background:var(--color-primary-tint);color:var(--color-primary-strong);border-color:var(--color-primary-strong)}.consent-banner__btn--decline:hover,.consent-prefs__btn--off:hover{background:color-mix(in srgb, var(--color-primary) 20%, var(--color-bg));color:var(--color-primary-strong);border-color:var(--color-primary-strong)}.consent-banner__link{min-height:44px;color:var(--color-text-muted);align-items:center;font-size:.9rem;font-weight:600;display:inline-flex}.consent-banner__link:hover{color:var(--color-primary);text-decoration:underline}.consent-prefs{background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-lg);margin:1.5rem 0;padding:1.25rem}.consent-prefs__status{min-height:1.5rem;margin:0 0 1rem;font-weight:700}.consent-prefs__noscript{color:var(--color-text-muted);margin:1rem 0 0}.consent-prefs__title{margin:0 0 .5rem;font-size:1.1rem}.consent-prefs__about{color:var(--color-text-muted);margin:0 0 1rem}.consent-prefs__switch{cursor:pointer;align-items:center;gap:.6rem;margin:0 0 .75rem;font-weight:700;display:flex}.consent-prefs__switch input{width:1.25rem;height:1.25rem;accent-color:var(--color-primary);margin:0}[data-engine]{min-height:var(--reserve-piano,var(--reserve,0px))}:root[data-instrument=guitar] [data-engine]{min-height:var(--reserve-guitar,var(--reserve,0px))}:root[data-instrument=bass] [data-engine]{min-height:var(--reserve-bass,var(--reserve,0px))}:root[data-instrument=violin] [data-engine]{min-height:var(--reserve-violin,var(--reserve,0px))}.game .prompt{margin:0 0 .25rem;font-size:1.2rem;font-weight:700}.game .meta{color:var(--color-text-muted);margin:0 0 1rem;font-size:.875rem}.game .options{grid-template-columns:repeat(2,1fr);gap:.6rem;max-width:24rem;margin:1rem 0;display:grid}.game .options button,.game button.listen,.game button[data-action]{border-radius:var(--radius-pill);background:var(--color-primary);min-height:44px;color:var(--color-on-primary);font:inherit;cursor:pointer;border:none;justify-content:center;align-items:center;padding:.7rem 1.4rem;font-weight:700;transition:transform .12s,background-color .12s,box-shadow .12s;display:inline-flex;box-shadow:0 0 24px -6px #7cf3e373}.game .options button{background:var(--color-bg);color:var(--color-text);box-shadow:inset 0 0 0 1.5px var(--color-answer-border)}.game .options button:hover:not(:disabled){background:var(--color-primary-tint);box-shadow:inset 0 0 0 1.5px var(--color-primary);transform:translateY(-2px)}.game button[data-action]:hover{background:var(--color-primary-strong);transform:translateY(-2px)}.game button.listen{background:var(--color-surface);color:var(--color-text);box-shadow:inset 0 0 0 2px var(--color-primary), 0 0 28px -4px #7cf3e366}.game button.listen:hover{background:var(--color-primary-tint);color:var(--color-text)}.game .options button:disabled{color:var(--color-text-subtle);box-shadow:inset 0 0 0 1.5px var(--color-border);cursor:default}.game .status{border-radius:999px;margin:.5rem 0;padding:.4rem .9rem;font-size:.9rem;font-weight:700;display:inline-block}.game .status.ok{background:var(--color-success-bg);color:var(--color-success-text)}.game .status.err{background:var(--color-error-bg);color:var(--color-error-text)}.metronome-lab{grid-template-columns:minmax(0,3fr) minmax(17rem,2fr);grid-template-areas:"scene controls""lesson lesson""status status""challenge challenge";gap:1rem 1.25rem;width:100%;max-width:100%;display:grid}.metronome-lab__scene{aspect-ratio:3/2;border:1px solid var(--color-border);border-radius:var(--radius-lg);min-width:0;box-shadow:var(--shadow-card);background:#e2ded7;grid-area:scene;position:relative;overflow:hidden}.metronome-lab__scene picture,.metronome-lab__scene [data-fallback-image],.metronome-scene__canvas{width:100%;height:100%;display:block}.metronome-lab__scene [data-fallback-image]{object-fit:cover}.metronome-scene__canvas{position:absolute;inset:0}.metronome-lab[data-rendering=webgl] [data-fallback-image]{opacity:0}.metronome-lab__controls{grid-area:controls;grid-template-columns:repeat(2,minmax(0,1fr));align-content:start;gap:.6rem;min-width:0;display:grid}.metronome-lab__controls output,.metronome-lab__controls [data-action=set-bpm],.metronome-lab__controls select{grid-column:1/-1}.metronome-lab__controls output{color:var(--color-primary-strong);font-variant-numeric:tabular-nums;font-size:2rem;font-weight:800;line-height:1;display:block}.metronome-lab__controls input,.metronome-lab__controls select,.metronome-lab__controls button,.metronome-lab__challenge button{min-width:0;min-height:44px;font:inherit}.metronome-lab__controls input[type=range]{accent-color:var(--color-primary)}.metronome-lab__controls button[data-action]{background:var(--color-bg);color:var(--color-text);box-shadow:inset 0 0 0 1.5px var(--color-answer-border)}.metronome-lab__controls button[data-action]:hover{background:var(--color-primary-tint);color:var(--color-text);box-shadow:inset 0 0 0 1.5px var(--color-primary)}.metronome-lab__controls select{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);padding:.55rem .75rem}.metronome-lab__lesson{grid-area:lesson;min-width:0}.metronome-lab>.status{grid-area:status}.metronome-lab__challenge{flex-wrap:wrap;grid-area:challenge;gap:.6rem;display:flex}.metronome-lab [hidden],.metronome-lab [data-action][hidden]{display:none}@media (width>=721px){:root .metronome-lab[data-engine],:root[data-instrument] .metronome-lab[data-engine]{min-height:0}}@media (width<=720px){.metronome-lab{grid-template-columns:minmax(0,1fr);grid-template-areas:"scene""controls""lesson""status""challenge"}}@media (prefers-reduced-motion:reduce){.metronome-lab__scene,.metronome-lab__scene [data-fallback-image],.metronome-lab__controls,.metronome-lab [class*=motion],.metronome-lab button[data-action],.metronome-lab button[data-action]:hover{transition:none!important;animation:none!important;transform:none!important}}.chord-line{flex-wrap:wrap;justify-content:center;gap:.5rem;margin:1rem 0 0;padding:0;list-style:none;display:flex}.chord-chip{background:var(--color-border-soft);border-radius:999px;padding:.35rem .7rem;font-size:.95rem;font-weight:700}.chord-chip--answer{background:var(--color-secondary-tint);color:var(--color-secondary-text)}.note-keys{scrollbar-width:thin;scrollbar-color:var(--color-border) transparent;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;margin:1rem 0 0;overflow:auto hidden}.note-keys::-webkit-scrollbar{height:8px}.note-keys::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:999px}.note-keys svg{width:auto;max-width:none;height:132px;display:block}.note-keys .key{scroll-snap-align:start;cursor:pointer}.note-keys .key-octave{fill:var(--color-key-label);pointer-events:none;font-size:13px;font-weight:700}.note-keys .key:hover{opacity:.85}.note-keys .key:active{opacity:.7}.sing-keys{max-width:20rem;margin:1rem auto 0}.sing-keys svg{width:100%;max-width:100%;height:auto;display:block}.sing-octave{justify-content:center;align-items:center;gap:.6rem;margin:0 auto .75rem;display:flex}.sing-octave__label{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.04em;font-size:.8rem}.sing-back .sing-octave__btn[data-action]{background:var(--color-surface);width:44px;height:44px;min-height:44px;color:var(--color-text);box-shadow:var(--shadow-card);border-radius:50%;padding:0;font-size:1rem}.sing-back .sing-octave__btn[data-action]:hover:not(:disabled){background:var(--color-primary-tint);transform:none}.sing-back .sing-octave__btn[data-action]:disabled{opacity:.35;cursor:default}.sing-octave__arrow{fill:currentColor;width:14px;height:14px}.sing-octave__arrow--down{transform:rotate(180deg)}.sing-row{flex-wrap:wrap;justify-content:center;gap:1.5rem;margin:0 auto 1.5rem;display:flex}.sing-slot{flex-direction:column;align-items:center;display:flex}.sing-slot__label{color:var(--color-text-muted);text-align:center;max-width:9rem;margin:0 0 .5rem;font-size:.9rem;font-weight:700}.sing-slot__verdict{margin:.6rem 0 0;font-size:1.25rem;font-weight:700}.sing-slot__verdict--right{color:var(--color-success-text)}.sing-slot__verdict--wrong{color:var(--color-error-text)}.sing-slot__verdict--missed{color:var(--color-text-muted)}.sing-slot__answer{color:var(--color-text-muted);margin:.15rem 0 0;font-size:.9rem}.sing-mic--right .sing-mic__btn[data-action]{background:var(--color-success-text)}.sing-mic--wrong .sing-mic__btn[data-action]{background:var(--color-error-text)}.sing-keys--playable .key{cursor:pointer}.sing-keys--playable .key:hover{opacity:.85}.sing-keys--playable .key:active{opacity:.7}.sing-mic{place-items:center;width:132px;height:132px;margin:0 auto 2rem;display:grid;position:relative}.sing-mic__halo{background:var(--color-primary-tint);opacity:0;border-radius:50%;transition:opacity .18s,transform .18s;position:absolute;inset:-18px;transform:scale(.85)}.sing-mic--hearing .sing-mic__halo{opacity:1;transform:scale(1)}.sing-mic__ring{width:100%;height:100%;position:absolute;inset:0;transform:rotate(-90deg)}.sing-mic__track{fill:none;stroke:var(--color-border);stroke-width:6px}.sing-mic__fill{fill:none;stroke:var(--color-primary);stroke-width:6px;stroke-linecap:round;transition:stroke-dasharray 90ms linear}.sing-back .sing-mic__btn[data-action]{background:var(--color-primary);width:84px;height:84px;min-height:84px;box-shadow:var(--shadow-card);border-radius:50%;padding:0;position:relative}.sing-back .sing-mic__btn[data-action]:hover{background:var(--color-primary-strong);transform:none}.sing-mic__icon{background:var(--color-on-primary);border-radius:999px;width:16px;height:26px;margin-bottom:12px;position:relative}.sing-mic__icon:before{content:"";border:2px solid var(--color-on-primary);border-top:none;border-radius:0 0 999px 999px;width:26px;height:13px;margin:3px 0 0 -13px;position:absolute;top:100%;left:50%}.sing-mic__icon:after{content:"";background:var(--color-on-primary);width:2px;height:6px;margin:18px 0 0 -1px;position:absolute;top:100%;left:50%}.sing-meter{background:var(--color-border-soft);border-radius:999px;width:min(20rem,100%);height:12px;margin:0 auto .75rem;position:relative;overflow:hidden}.sing-meter__target{background:var(--color-primary-tint);border-left:2px solid var(--color-primary);border-right:2px solid var(--color-primary);width:50%;position:absolute;top:0;bottom:0;left:25%}.sing-meter__mark{background:var(--color-text-muted);border-radius:50%;width:14px;height:14px;margin:-7px 0 0 -7px;transition:left 90ms linear,background-color .12s;position:absolute;top:50%}.sing-meter__mark--on{background:var(--color-success-text)}.sing-back .sing-reading{min-height:1.4em;color:var(--color-text-muted);margin:0 0 .5rem;font-size:.9rem}.sing-back .sing-sang{margin:0 0 .5rem;font-size:1.5rem;font-weight:700}.sing-back .sing-sang--right{color:var(--color-success-text)}.sing-back .sing-sang--wrong{color:var(--color-error-text)}.sing-back .sing-asked{color:var(--color-text-muted);margin:0 0 .5rem;font-size:1.05rem}.sing-back .sing-problem{margin:0 0 .5rem}.sing-back .sing-detail{opacity:.7;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.75rem}@media (prefers-reduced-motion:reduce){.sing-mic__halo,.sing-mic__fill,.sing-meter__mark{transition:none}}.builder-card{max-width:var(--container-w);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-primary-tint);margin:1.5rem auto 0;padding:1.1rem 1.3rem}.builder-card__kicker{letter-spacing:.06em;text-transform:uppercase;color:var(--color-primary-strong);margin:0 0 .25rem;font-size:.75rem;font-weight:700}.builder-card__title{margin:0 0 .35rem;font-size:1.15rem}.builder-card__title a{color:var(--color-text);text-decoration:none}.builder-card__title a:hover{text-decoration:underline}.builder-card__desc{color:var(--color-text-muted);margin:0;font-size:.925rem}@media (width<=560px){.site-header__inner{padding-block:.5rem}.hero{padding:2.5rem 1.25rem 2rem}.lesson-grid{grid-template-columns:1fr}.game-card,.demo-card{padding:1.25rem 1rem}}.instrument-picker{flex-wrap:wrap;align-items:center;gap:.6rem;margin:0 0 1rem;display:flex}.instrument-picker__label{color:var(--color-text-muted);font-size:.9rem;font-weight:700}.instrument-picker__select{border:2px solid var(--color-control-border);background:var(--color-surface);min-height:44px;color:var(--color-text);font:inherit;cursor:pointer;border-radius:12px;padding:.4rem .8rem;font-weight:700}.instrument-picker__select:focus-visible{outline:3px solid var(--color-primary);outline-offset:1px}.session-length-picker{flex-wrap:wrap;align-items:center;gap:.6rem;margin:0 0 1rem;display:flex}.session-length-picker__label{color:var(--color-text-muted);font-size:.9rem;font-weight:700}.session-length-picker__select{border:2px solid var(--color-control-border);background:var(--color-surface);min-height:44px;color:var(--color-text);font:inherit;cursor:pointer;border-radius:12px;padding:.4rem .8rem;font-weight:700}.session-length-picker__select:focus-visible{outline:3px solid var(--color-primary);outline-offset:1px}.note-naming-picker{flex-wrap:wrap;align-items:center;gap:.5rem;margin:.5rem 0;display:flex}.note-naming-picker__label{color:var(--color-text-muted);font-size:.9rem;font-weight:700}.note-naming-picker__select{border:2px solid var(--color-control-border);background:var(--color-surface);min-width:0;max-width:100%;min-height:44px;color:var(--color-text);font:inherit;cursor:pointer;border-radius:12px;padding:.4rem .8rem;font-weight:700}.note-naming-picker__select:focus-visible{outline:3px solid var(--color-primary);outline-offset:1px}.custom-panel{max-width:var(--container-w);margin:0 auto 3rem;padding:0 1.25rem}.custom-panel__prefs{flex-wrap:wrap;gap:0 1.5rem;margin-bottom:1rem;display:flex}.custom-panel__note{color:var(--color-text-muted);max-width:60ch;margin:0 0 1rem;font-size:.9rem}.custom-form{flex-direction:column;gap:.75rem;margin:0 0 1.5rem;display:flex}.custom-form__row{flex-wrap:wrap;align-items:center;gap:.6rem;display:flex}.custom-form__row>label{color:var(--color-text-muted);min-width:9rem;font-size:.9rem;font-weight:700}.custom-form select,.custom-presets__name{border:2px solid var(--color-control-border);background:var(--color-surface);min-height:44px;color:var(--color-text);font:inherit;border-radius:12px;padding:.4rem .8rem;font-weight:700}.custom-form select:focus-visible,.custom-presets__name:focus-visible,.custom-presets__save input:focus-visible{outline:3px solid var(--color-primary);outline-offset:1px}.custom-form__keys{border:2px solid var(--color-control-border);border-radius:12px;margin:0;padding:.75rem 1rem}.custom-form__keys legend{color:var(--color-text-muted);padding:0 .4rem;font-size:.9rem;font-weight:700}.custom-form__hint{color:var(--color-text-muted);margin:0 0 .5rem;font-size:.85rem}.custom-form__checks{flex-wrap:wrap;gap:.5rem 1rem;display:flex}.custom-form__check{align-items:center;gap:.4rem;min-height:44px;font-size:.9rem;font-weight:700;display:inline-flex}.custom-form__check--wide{display:flex}.custom-form button[data-start]{background:var(--color-primary);min-height:44px;color:var(--color-on-primary);font:inherit;cursor:pointer;box-shadow:var(--shadow-card);border:none;border-radius:14px;align-self:flex-start;padding:.7rem 1.4rem;font-weight:700}.custom-form button[data-start]:disabled{background:var(--color-border,#e3dccd);color:var(--color-text-muted);cursor:not-allowed;box-shadow:none}.custom-form__problem:empty{display:none}.custom-form__problem{color:var(--color-text);max-width:60ch;margin:0;font-weight:700}.custom-presets__save{flex-wrap:wrap;align-items:center;gap:.6rem;margin-bottom:.75rem;display:flex}.custom-presets__save label{color:var(--color-text-muted);font-size:.9rem;font-weight:700}.custom-presets__save input{border:2px solid var(--color-control-border);background:var(--color-surface);min-height:44px;color:var(--color-text);font:inherit;border-radius:12px;padding:.4rem .8rem}.custom-presets__list{flex-direction:column;gap:.5rem;margin:0;padding:0;list-style:none;display:flex}.custom-presets__item{flex-wrap:wrap;align-items:center;gap:.5rem;display:flex}.custom-presets__name{flex:12rem;min-width:0}.custom-presets__empty{color:var(--color-text-muted);font-size:.9rem}.custom-presets button,.custom-presets__save button{border:2px solid var(--color-control-border);background:var(--color-surface);min-height:44px;color:var(--color-text);font:inherit;cursor:pointer;border-radius:12px;padding:.5rem 1rem;font-weight:700}.custom-presets button:disabled{color:var(--color-text-muted);cursor:not-allowed}.chord-builder .prompt,.note-find .prompt{margin:0 0 .25rem;font-size:1.2rem;font-weight:700}.chord-builder .meta,.note-find .meta{color:var(--color-text-muted);margin:0 0 1.25rem;font-size:.875rem}.instrument-surface .fretboard{-webkit-overflow-scrolling:touch;margin:0 0 1rem;padding-bottom:.5rem;display:flex;overflow-x:auto}.instrument-surface .fretboard svg{touch-action:manipulation;filter:drop-shadow(0 8px 14px #00000073);width:100%;min-width:460px;max-width:640px}.instrument-surface .fretboard svg.fingerboard{flex-shrink:0;width:auto;max-width:none;height:auto}.instrument-surface .key{cursor:pointer;transition:fill .12s}.instrument-surface .key.white{fill:var(--color-key-white);stroke:var(--color-key-white-edge);stroke-width:1px}.instrument-surface .key.white:not(.selected):not(.reveal):hover{fill:var(--color-key-white-hover)}.instrument-surface .key.black{fill:var(--color-key-black);stroke:var(--color-key-black-edge);stroke-width:1px}.instrument-surface .key.black:not(.selected):not(.reveal):hover{fill:var(--color-key-black-hover)}.instrument-surface .key.selected{fill:var(--color-mark);stroke:var(--color-mark-strong)}.instrument-surface .key.reveal{fill:var(--color-mark-answer);stroke:var(--color-mark-answer-strong);stroke-width:1.5px}.chord-builder .status,.note-find .status{border-radius:999px;margin:.5rem 0;padding:.4rem .9rem;font-size:.9rem;font-weight:700;display:inline-block}.chord-builder .status.ok,.note-find .status.ok{background:var(--color-success-bg);color:var(--color-success-text)}.chord-builder .status.err,.note-find .status.err{background:var(--color-error-bg);color:var(--color-error-text)}.chord-builder button[data-action],.note-find button[data-action]{border-radius:var(--radius-pill);background:var(--color-primary);min-height:44px;color:var(--color-on-primary);font:inherit;cursor:pointer;border:none;justify-content:center;align-items:center;margin-top:.5rem;padding:.7rem 1.5rem;font-weight:700;transition:transform .12s,box-shadow .12s,background-color .12s;display:inline-flex;box-shadow:0 0 24px -6px #7cf3e373}.chord-builder button[data-action]:hover,.note-find button[data-action]:hover{background:var(--color-primary-strong);transform:translateY(-2px);box-shadow:0 0 32px -4px #7cf3e399}.chord-builder button[data-action]:active,.note-find button[data-action]:active{transform:translateY(0);box-shadow:0 0 24px -6px #7cf3e373}.fretboard{-webkit-overflow-scrolling:touch;margin:0 0 1rem;padding-bottom:.5rem;display:flex;overflow-x:auto}.fretboard>*{margin-inline:auto}.fretboard svg{touch-action:manipulation;filter:drop-shadow(0 8px 14px #00000073)}.fretboard .board{fill:var(--color-board);stroke:var(--color-key-white-edge);stroke-width:1px}.fretboard .fret{stroke:#c9bfa8;stroke-width:2px}.fretboard .string{stroke:#8d8272;stroke-width:2px}.fretboard .inlay{fill:#ded4c0}.fretboard .position-mark{fill:none;stroke:#b5a688;stroke-width:1.5px;stroke-dasharray:2 2}.fretboard .dot{fill:var(--color-mark);pointer-events:none}.fretboard .dot.reveal{fill:var(--color-mark-answer)}.fretboard .verdict{fill:none;stroke:var(--color-key-white);stroke-width:3px;stroke-linecap:round;stroke-linejoin:round;pointer-events:none}.fretboard .hit{fill:#0000;cursor:pointer}.fretboard .hit:hover{fill:#0d94882e}.fretboard .nut{fill:#6f6656}.fretboard .stop-number{fill:var(--color-text-muted);font-variant-numeric:tabular-nums;font-size:13px;font-weight:700}.fingerboard-frame{align-items:flex-start;gap:.4rem;display:flex}.fingerboard-frame .string-labels{flex-shrink:0;margin:0;padding:0;list-style:none}.fingerboard-frame .string-labels li{height:var(--string-row);color:var(--color-text-muted);font-variant-numeric:tabular-nums;white-space:nowrap;justify-content:flex-end;align-items:center;font-size:.8125rem;font-weight:700;display:flex}.fingerboard-frame .fretboard{flex:auto;justify-content:safe center;min-width:0}.status:empty{margin:0;padding:0;font-size:0;display:inline}div.staff{-webkit-overflow-scrolling:touch;max-width:100%;min-height:176px;margin:1rem 0;padding-bottom:.5rem;overflow-x:auto}svg.staff{max-width:none;margin:0;display:block}.staff-read .options{grid-template-columns:repeat(4,minmax(0,1fr));gap:.5rem;max-width:24rem;display:grid}.staff-read .options button{min-width:0;min-height:44px;padding-inline:.4rem}.staff-read__reading{width:fit-content;max-width:100%}.staff-read__deadline{background:var(--color-primary-tint);border-radius:3px;height:6px;margin:.5rem 0;overflow:hidden}.staff-read__deadline span{background:var(--color-primary);height:100%;transition:width .1s linear;display:block}.staff-read__timed{vertical-align:middle;cursor:pointer;align-items:center;gap:.4rem;min-height:44px;font-weight:700;display:inline-flex}.staff-read__timed input{width:20px;height:20px;accent-color:var(--color-primary);cursor:pointer;margin:0}.rhythm-tap__pattern{max-width:100%;margin:1rem 0;padding-bottom:.5rem;overflow-x:hidden}svg.rhythm{max-width:100%;height:auto;margin:0 auto;display:block}.rhythm-mark--on{fill:var(--color-success-text)}.rhythm-mark--close{fill:var(--color-secondary-text)}.rhythm-mark--off{fill:var(--color-error-text)}.rhythm-mark--missed{stroke:var(--color-error-text)}.rhythm-tap__pad{border-radius:var(--radius-lg);background:var(--color-surface);width:100%;min-height:200px;box-shadow:inset 0 0 0 2px var(--color-primary), 0 0 40px -8px #7cf3e366;color:var(--color-text);cursor:pointer;touch-action:manipulation;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;border:none;flex-direction:column;justify-content:center;align-items:center;gap:.25rem;margin:1rem 0;padding:1rem;font-family:inherit;font-size:1.25rem;font-weight:700;display:flex}.rhythm-tap__pad:active:not(:disabled){background:var(--color-primary-tint)}.rhythm-tap__pad:disabled{background:var(--color-surface);box-shadow:inset 0 0 0 1px var(--color-border);color:var(--color-text-muted);cursor:default}.rhythm-tap__pad>*{pointer-events:none}.rhythm-tap__pulse{color:var(--color-primary);font-variant-numeric:tabular-nums;min-height:2.5rem;font-size:2.5rem;line-height:1}.rhythm-tap__hint{opacity:.85;font-size:1rem}.catalog{padding:0;max-width:var(--container-w);grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem;margin:0 0 2rem;margin-inline:auto;padding-inline:1.25rem;list-style:none;display:grid}.catalog__kind{color:var(--color-text-muted);font-size:.9rem}.catalog__started{background:var(--color-primary-tint);color:var(--color-primary-strong);border-radius:999px;margin-top:.5rem;padding:.15rem .6rem;font-size:.75rem;font-weight:700;display:inline-block}.catalog__started[hidden]{display:none}.catalog__item{border:2px solid #0000}.catalog__item.is-started{border-color:var(--color-primary)}.catalog-group__title{margin:1.5rem 0 .75rem;max-width:var(--container-w);margin-inline:auto;padding-inline:1.25rem;font-size:1.1rem}.catalog-group__title a{color:var(--color-text);border-bottom:2px solid #7cf3e34d;text-decoration:none}.catalog-group__title a:hover{border-bottom-color:var(--color-primary)}.continue-here{text-align:center;margin:0 0 2rem}.achievements{max-width:var(--container-w);margin:0 0 2rem;margin-inline:auto;padding-inline:1.25rem}:root:not([data-progress=some]) .achievements{display:none}.achievements__title{margin:0 0 .75rem;font-size:1.1rem}.achievements__list{-webkit-overflow-scrolling:touch;flex-wrap:nowrap;gap:.5rem;margin:0;padding:0;list-style:none;display:flex;overflow-x:auto}:root[data-progress=some] .achievements__list{min-height:36px}.achievements__item{background:var(--color-secondary-tint);color:var(--color-secondary-text);border-radius:999px;flex-shrink:0;padding:.35rem .8rem;font-size:.85rem;font-weight:700}.section-title{max-width:var(--container-w);margin:2.5rem 0 1rem;margin-inline:auto;padding-inline:1.25rem;font-size:1.25rem}.section-title a{color:var(--color-text);border-bottom:2px solid #7cf3e34d}.section-title a:hover{border-bottom-color:var(--color-primary)}.instrument-strip{max-width:calc(var(--container-w) - 2.5rem);background:var(--color-primary-tint);border:1px solid var(--color-border-soft);border-radius:var(--radius-md);flex-wrap:wrap;align-items:center;gap:.5rem 1.25rem;margin:0 auto 1.5rem;padding:.85rem 1.5rem;display:flex}.instrument-strip .instrument-picker{margin:0}.instrument-strip__link{color:var(--color-text-muted);text-decoration:underline;text-decoration-color:var(--color-border);text-underline-offset:3px;font-size:.9rem}.instrument-strip__link:hover{color:var(--color-primary-strong);text-decoration-color:currentColor}@media (width<=560px){.instrument-strip{flex-direction:column;align-items:flex-start}}.module-grid{max-width:var(--container-w);grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.25rem;margin:0;margin-inline:auto;padding:0;padding-inline:1.25rem;list-style:none;display:grid}.module-card{background-color:var(--color-surface);background-image:var(--spectrum);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);background-position:top;background-repeat:no-repeat;background-size:100% 3px;flex-direction:column;padding:1.5rem;transition:transform .15s,box-shadow .15s;display:flex;position:relative}.module-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-4px)}.module-card:focus-within{outline:3px solid var(--color-primary);outline-offset:3px}.module-card__mark{width:calc(var(--mark-size,40px) + 16px);height:calc(var(--mark-size,40px) + 16px);border-radius:var(--radius-md);background:var(--color-primary-tint);color:var(--color-primary);justify-content:center;align-items:center;margin-bottom:.85rem;display:inline-flex}.module-card:nth-child(2n) .module-card__mark{background:var(--color-secondary-tint);color:var(--color-secondary-text)}.module-card__mark svg{display:block}.module-card__title{margin:0 0 .4rem;font-size:1.15rem}.module-card__title a{color:var(--color-text)}.module-card__title a:after{content:"";border-radius:inherit;position:absolute;inset:0}.module-card:hover .module-card__title a,.module-card__title a:hover{color:var(--color-primary);text-decoration:underline}.module-card__title a:focus-visible{outline:none}.module-card__desc{color:var(--color-text-muted);margin:0 0 .75rem;font-size:.92rem;line-height:1.5;position:relative}.module-card__counts{margin:0;color:var(--color-text-muted);margin-block-start:auto;font-size:.8rem;font-weight:700;position:relative}.article-list{max-width:var(--container-w);gap:.5rem;margin:0;margin-inline:auto;padding:0;padding-inline:1.25rem;list-style:none;display:grid}.article-row{background:var(--color-surface);border-radius:var(--radius-md);box-shadow:var(--shadow-card);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:.25rem 1rem;padding:.85rem 1.1rem;display:flex}.article-row__title{color:var(--color-text);font-weight:700}.article-row:hover .article-row__title,.article-row__title:hover{color:var(--color-primary);text-decoration:underline}.article-row .article-date{white-space:nowrap;margin:0;font-size:.8rem}.site-main>.progress-card{margin-top:2.5rem;width:calc(100% - 2.5rem);max-width:calc(var(--container-w) - 2.5rem);margin-inline:auto}.path{max-width:640px;margin:0 auto 3rem;padding-inline:1.25rem}.path__all-done{text-align:center;color:var(--color-text-muted);font-weight:600}.path__unit{margin-top:2rem}.path__unit-title{justify-content:space-between;align-items:baseline;gap:1rem;font-size:1.2rem;display:flex}.path__unit-progress{color:var(--color-text-muted);white-space:nowrap;font-size:.85rem;font-weight:600}.path__steps{margin:.75rem 0 0;padding:0;list-style:none;position:relative}.path__steps:before{content:"";background:var(--color-border);width:2px;position:absolute;top:12px;bottom:12px;left:27px}.path__step{position:relative}.path__link{border-radius:var(--radius-md);color:var(--color-text);grid-template-columns:40px 1fr auto;align-items:center;gap:.75rem;padding:.6rem .5rem;text-decoration:none;display:grid}.path__link:hover{background:var(--color-primary-tint)}.path__marker{border:2px solid var(--color-border);background:var(--color-surface);box-sizing:border-box;z-index:1;border-radius:50%;width:20px;height:20px;margin-left:10px;position:relative}.path__step[data-state=done] .path__marker{background:var(--color-primary);border-color:var(--color-primary)}.path__step[data-state=next] .path__marker{border-color:var(--color-secondary);box-shadow:0 0 0 4px var(--color-secondary-tint)}.path__title{font-weight:600}.path__state{color:var(--color-text-muted);text-align:right;min-width:4.5rem;font-size:.8rem;font-weight:700}.path__step[data-state=next] .path__state{color:var(--color-secondary-text)}body.is-session .site-main{padding:0}.session{max-width:560px;min-height:100dvh;padding:0 1rem calc(1rem + env(safe-area-inset-bottom));box-sizing:border-box;flex-direction:column;margin:0 auto;display:flex}.session__bar{align-items:center;gap:.75rem;padding:.75rem 0;display:flex}.session__close{width:44px;height:44px;color:var(--color-text-muted);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:1.6rem;line-height:1;text-decoration:none;display:inline-flex}.session__close:hover{background:var(--color-primary-tint);color:var(--color-primary)}.session__progress{flex:1;gap:4px;display:flex}.session__seg{background:var(--color-border);border-radius:999px;flex:1;height:10px;transition:background-color .2s}.session__seg.is-done{background:var(--color-primary)}.session .mascot{align-self:center;margin:.25rem 0 .5rem}.session__screen{flex-direction:column;flex:1;gap:1rem;display:flex}.session__screen[hidden]{display:none}.session__card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);padding:1.25rem 1.25rem 1rem}.session__card h1{margin:.25rem 0 .75rem;font-size:1.5rem}.session__eyebrow{color:var(--color-primary);letter-spacing:.04em;text-transform:uppercase;margin:0;font-size:.8rem;font-weight:700}.session__more{margin:.75rem 0 0;font-size:.9rem}.session__footer{padding-top:.75rem;padding-bottom:calc(.75rem + env(safe-area-inset-bottom));background:var(--color-bg);flex-direction:column;align-items:stretch;gap:.5rem;margin-top:auto;display:flex;position:sticky;bottom:0}.session__cta{width:100%}.session__quiet{color:var(--color-text-muted);font:inherit;cursor:pointer;text-align:center;background:0 0;border:none;padding:.6rem;font-weight:600;text-decoration:none}.session__engine{margin:0;padding:1.25rem 1rem}.session__engine .instrument-picker,.session__engine .session-length-picker,.session__engine .meta{display:none}.session__engine button[data-action=next]{width:100%;min-height:48px;margin-top:.75rem;font-size:1.05rem;display:block}.session__engine .status{box-sizing:border-box;text-align:center;border-radius:var(--radius-md);width:100%;padding:.7rem 1rem;font-size:1rem;display:block}.session__engine .status:empty{margin:0;padding:0;font-size:0;display:block}.session__end{text-align:center;justify-content:center;align-items:center}.session__result{margin:0;font-size:1.8rem;font-weight:600}.session__verdict{color:var(--color-text-muted);margin:0}.session__streak{color:var(--color-secondary-text);margin:0;font-weight:600}.session__end .session__footer{width:100%}.mascot{color:var(--color-primary);line-height:0;display:inline-block}.mascot__svg{display:block;overflow:visible}.mascot__eye{fill:#fff;stroke:currentColor;stroke-width:2.4px}.mascot__pupil{fill:var(--color-bg)}.mascot__mouth{fill:none;stroke:var(--color-text);stroke-width:2.8px;stroke-linecap:round}.mascot__mouth--frown{display:none}.mascot__spark{fill:var(--color-secondary);opacity:0}.mascot__body{transform-box:fill-box;transform-origin:50% 60%;animation:2.6s ease-in-out infinite mascot-idle}.mascot__eye,.mascot__pupil{transform-box:fill-box;transform-origin:50%;transition:transform .12s}.mascot[data-mood=happy] .mascot__body{animation:.5s ease-out mascot-hop}.mascot[data-mood=happy] .mascot__eye,.mascot[data-mood=happy] .mascot__pupil{transform:scaleY(.2)}.mascot[data-mood=oops] .mascot__body{animation:.45s ease-in-out mascot-shake}.mascot[data-mood=oops] .mascot__mouth--smile{display:none}.mascot[data-mood=oops] .mascot__mouth--frown{display:block}.mascot[data-mood=oops] .mascot__pupil{transform:translateY(2px)}.mascot[data-mood=party] .mascot__body{animation:.6s ease-out 2 mascot-hop}.mascot[data-mood=party] .mascot__spark{animation:.9s ease-out forwards mascot-spark}.mascot[data-mood=party] .mascot__spark:nth-child(2){animation-delay:.12s}.mascot[data-mood=party] .mascot__spark:nth-child(3){animation-delay:.24s}.mascot[data-mood=cheer] .mascot__body{animation:.7s ease-in-out 2 mascot-nod}@keyframes mascot-idle{0%,to{transform:translateY(0)rotate(0)}50%{transform:translateY(-3px)rotate(-2deg)}}@keyframes mascot-hop{0%{transform:translateY(0)}40%{transform:translateY(-14px)scale(1.04)}to{transform:translateY(0)}}@keyframes mascot-shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)rotate(-3deg)}75%{transform:translate(5px)rotate(3deg)}}@keyframes mascot-nod{0%,to{transform:rotate(0)}50%{transform:rotate(6deg)}}@keyframes mascot-spark{0%{opacity:0;transform:scale(.4)}30%{opacity:1}to{opacity:0;transform:scale(1.6)translateY(-8px)}}@media (prefers-reduced-motion:reduce){.mascot__body,.mascot[data-mood] .mascot__body,.mascot__spark,.mascot[data-mood] .mascot__spark{animation:none}.mascot__eye,.mascot__pupil{transition:none}.mascot[data-mood=party] .mascot__spark{opacity:1}}
