:root{--navy:#193d66;--blue:#275c99;--pale:#eaf1fb;--ink:#203349;--muted:#5e7086;--line:#d6e0ed;--paper:#fff;--brass:#ad7941;--bg:#f5f8fc}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.72 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--blue);text-underline-offset:4px}a:hover{color:#102f55}button,input,select{font:inherit}button,a.button,.secondary{cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,.note-dot:focus-visible{outline:3px solid #c0832f;outline-offset:4px}header{background:#fff;border-bottom:1px solid var(--line)}.topbar{max-width:1120px;margin:auto;padding:21px 32px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand img{width:218px;height:auto;display:block}.topnav{display:flex;gap:24px;align-items:center;font-size:14px}.topnav a{text-decoration:none;font-weight:600}.edition{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:3px 9px;white-space:nowrap}.layout{max-width:920px;margin:0 auto}.article-page{padding:56px 70px 68px;background:var(--paper);margin:28px auto 0;border:1px solid var(--line);border-radius:20px}.home{max-width:1020px}.hero{padding:10px 0 32px;border-bottom:1px solid var(--line);margin-bottom:36px}.eyebrow{font-size:11px;line-height:1.65;letter-spacing:.13em;text-transform:uppercase;color:var(--blue);font-weight:750;margin:0 0 18px}h1,h2,h3{color:var(--navy);line-height:1.2}h1{font-size:40px;letter-spacing:-.04em;margin:0 0 24px;font-weight:750}h1 em{font-style:normal;color:#537fac}h2{font-size:24px;letter-spacing:-.02em;margin:36px 0 14px}h3{font-size:19px;margin:22px 0 10px}p{margin:0 0 19px}.lead{font-size:20px;line-height:1.6;max-width:650px;color:var(--muted)}.small,figcaption{font-size:13px;line-height:1.65;color:var(--muted)}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0 20px}.button,.play-btn{background:var(--navy);border:1px solid var(--navy);color:#fff;padding:11px 20px;border-radius:9px;display:inline-block;text-decoration:none;font-weight:650;font-size:15px}.button:hover,.play-btn:hover{background:#28547f;color:#fff}.secondary{border:1px solid var(--line);border-radius:9px;color:var(--navy);background:#fff;padding:10px 16px;display:inline-block;text-decoration:none;font-size:14px;font-weight:600}.minor-link{font-size:12px;display:block;margin:6px 0 12px}audio{width:100%;margin:4px 0 10px;height:48px}.goal{background:var(--pale);padding:20px 24px;border-left:4px solid var(--blue);border-radius:0 12px 12px 0;margin:26px 0 28px}.goal span{font-size:11px;text-transform:uppercase;font-weight:750;letter-spacing:.11em;color:var(--blue)}.goal p{margin:6px 0 0;font-size:19px;line-height:1.55}.tag{display:inline-block;font-size:12px;color:var(--blue);background:var(--pale);border-radius:6px;padding:4px 10px;margin:0 0 10px}.listen,.worked,.checkpoint,.stop-card{padding:22px 25px;border-radius:12px;margin:28px 0}.listen{background:#f4f7fc;border:1px solid var(--line)}.worked{background:#fffaf2;border:1px solid #ede0ca}.checkpoint{border:1px solid var(--line)}.stop-card{background:#edf4fc;border:1px solid #cfdfef}.listen h2,.worked h2,.checkpoint h2,.stop-card h2{margin-top:0;font-size:20px}.practice{padding-left:24px}.practice li{padding-left:9px;margin:0 0 16px}.practice li::marker{color:var(--blue);font-weight:700}details{border-top:1px solid var(--line);margin:14px 0 0}summary{cursor:pointer;padding:14px 0;color:var(--navy);font-weight:650;font-size:15px}details p{margin-top:9px}.lesson-nav{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:38px}.lesson-nav a{max-width:55%;text-align:center}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:28px 0}.steps b{color:var(--brass);font-size:14px}.steps h3{font-size:18px;margin:8px 0}.steps p{font-size:14px;color:var(--muted)}.progress-card{margin:26px 0;padding:18px 22px;background:var(--bg);border-radius:10px}.progress-text{font-size:14px;display:block}progress{display:block;width:100%;height:8px;accent-color:var(--blue);margin:14px 0}.text-button{font-size:12px;background:none;border:none;color:var(--blue);text-decoration:underline;display:inline-block;padding:4px 8px 4px 0;cursor:pointer}.search-label{display:block;font-size:13px;color:var(--muted)}.lesson-search{display:block;width:100%;border:1px solid var(--line);border-radius:8px;padding:11px 14px;background:#fff;margin-top:6px;color:var(--ink)}.module{border:1px solid var(--line);border-radius:12px;padding:0 20px;margin:15px 0}.module summary{display:flex;align-items:center;gap:14px;list-style:none;font-size:17px;padding:17px 0}.module summary:after{content:'+';margin-left:auto;font-size:22px;font-weight:400}.module[open] summary:after{content:'−'}.module-number{color:var(--blue);font-size:12px;font-weight:700;border:1px solid var(--line);border-radius:6px;padding:3px 8px}.module>p{font-size:14px;color:var(--muted)}.lesson-list{padding:0;list-style:none;margin:0 0 12px}.lesson-list li{border-top:1px solid #e9eef5}.lesson-list a{display:flex;align-items:center;gap:13px;padding:11px 0;font-size:14px;text-decoration:none;line-height:1.5}.lesson-no{font-size:11px;color:var(--muted);min-width:24px}.lesson-list small{display:block;font-size:11px;color:var(--muted)}.done-indicator{margin-left:auto;color:var(--blue)}.complete-check{accent-color:var(--blue);width:17px;height:17px;vertical-align:middle;margin-right:8px}.stop-card label{font-size:14px}.study{margin:32px 0;padding:22px;border:1px solid #bfcfe3;border-radius:12px;background:#fcfdff}.study h2{margin:0 0 12px}.progression{font-size:14px;font-weight:650;color:var(--navy);line-height:2.3;word-spacing:5px}.progression span{color:#a5b5c9}.tracklabel{font-size:13px;display:block;margin:14px 0}.tracklabel select{display:block;width:100%;margin-top:6px}.bar-controls{display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap;margin:20px 0;padding-top:18px;border-top:1px solid var(--line)}.bar-controls label{font-size:12px}.bar-controls select{display:block;margin-top:4px}.follow-label{display:flex;gap:5px;align-items:center;margin:7px 0}.bar-panel{padding-top:12px;border-top:1px solid var(--line)}select{background:white;color:var(--ink);border:1px solid var(--line);border-radius:7px;padding:8px;max-width:100%;font-size:14px}.neck,.tab{width:100%;display:block;height:auto}.tab-wrap{overflow-x:auto}.article-page h1:focus{outline:none}figure{overflow-x:auto}.note-dot{cursor:pointer}.note-dot:hover{opacity:.72}figure{margin:22px 0 10px}figcaption{margin-top:8px}.grips{display:flex;flex-wrap:wrap;gap:8px;align-items:flex-start}.grips svg{width:145px;max-width:46%;height:auto}.event-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px;margin:12px 0 20px}.event-card{padding:10px;border:1px solid var(--line);border-radius:8px;font-size:12px;background:#fff}.event-card strong{display:block;font-size:17px;color:var(--navy)}.event-card span{display:block;color:var(--muted);line-height:1.6}.event-card.active{background:var(--pale);border-color:var(--blue)}.analysis p{font-size:14px}.glossary dt{font-weight:700;color:var(--navy);margin-top:20px}.glossary dd{margin:3px 0 0;font-size:15px}footer{padding:35px 25px 100px;text-align:center;color:var(--muted);font-size:12px}footer p{margin:3px}.audio-dock{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);z-index:30;display:flex;gap:12px;align-items:center;width:calc(100% - 30px);max-width:520px;background:#193d66;color:white;border-radius:12px;padding:12px 17px;box-shadow:0 8px 28px #132b4633;font-size:13px}.audio-dock button{margin-left:auto;background:#fff;color:var(--navy);border:0;border-radius:7px;padding:7px 12px;font-size:13px}.audio-dock[hidden],[hidden]{display:none!important}.skip{position:absolute;top:-100px;left:10px;background:white;padding:12px;z-index:99}.skip:focus{top:5px}.toast{position:fixed;right:20px;top:15px;z-index:60;background:#193d66;color:#fff;padding:12px 20px;border-radius:8px;font-size:14px;max-width:85vw}.revision-note{font-size:11px;color:var(--muted)}.no-js{background:#fff4d8;padding:10px;margin:0;font-size:14px}
@media(max-width:680px){body{font-size:16px;line-height:1.75}.topbar{padding:17px 18px;gap:12px;align-items:center}.brand img{width:158px}.topnav{gap:12px;font-size:12px}.edition{display:none}.layout{padding:0 10px}.article-page{padding:30px 20px 40px;border-radius:13px;margin-top:14px}h1{font-size:30px}.hero h1{font-size:33px}h2{font-size:22px}.lead{font-size:18px}.goal,.listen,.worked,.checkpoint,.stop-card{padding:18px}.goal p{font-size:18px}.study{padding:15px;margin-left:-4px;margin-right:-4px}.steps{grid-template-columns:1fr;gap:4px}.steps>div{display:grid;grid-template-columns:25px 1fr;gap:0 9px}.steps b{grid-row:span 2;margin-top:8px}.steps p{grid-column:2}.module{padding:0 14px}.module summary{font-size:15px;gap:9px}.eyebrow{font-size:10px}.bar-controls{gap:8px}.bar-controls .secondary{padding:9px;font-size:12px}.event-cards{grid-template-columns:repeat(2,1fr)}.lesson-nav{gap:8px}.lesson-nav a{font-size:12px;padding:10px}.grips svg{width:126px}.topnav .reference-link{max-width:48px;line-height:1.4}.tab{min-width:470px}.neck{min-width:470px}}
@media print{header,footer,.audio-dock,.actions,.progress-card,.bar-controls,.lesson-nav,.play-btn,audio,.search-label{display:none!important}.article-page{border:0;margin:0;padding:0;break-after:page}.article-page[hidden]{display:block!important}.bar-panel[hidden]{display:block!important}details>*{display:block!important}body{background:white;font-size:11pt}.module{break-inside:avoid}h1{font-size:25pt}}


/* Fretboard diagrams */
.diagram-card{margin:30px 0;padding:24px 26px;border:1px solid #d7e3f0;border-radius:16px;background:linear-gradient(180deg,#fbfdff 0%,#f3f8fe 100%);box-shadow:0 8px 22px rgba(25,61,102,.05)}
.diagram-card h2{margin:0 0 8px;font-size:21px}
.diagram-intro{font-size:14px;color:var(--muted);margin:0 0 14px;max-width:70ch}
.diagram-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.fretboard-figure{margin:0;background:#fff;border:1px solid #d7e3f0;border-radius:14px;padding:14px 14px 10px;overflow:auto;box-shadow:0 6px 16px rgba(25,61,102,.04)}
.fretboard-figure svg{width:100%;height:auto;display:block;min-width:250px}
.fretboard-figure figcaption{margin-top:8px}
.diagram-tags{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 14px}
.diagram-tag{display:inline-flex;align-items:center;gap:6px;font-size:11px;line-height:1.2;border:1px solid #d8e4f1;padding:5px 9px;border-radius:999px;background:#fff;color:var(--muted);box-shadow:0 2px 8px rgba(25,61,102,.03)}
.diagram-tag .swatch{width:10px;height:10px;border-radius:50%;display:inline-block;border:1px solid rgba(0,0,0,.08)}
.fretboard-title{font-weight:750;font-size:14px;color:var(--navy);margin:0 0 4px}
.fretboard-subtitle{font-size:12px;color:var(--muted);margin:0 0 10px}
.fretboard-help{font-size:12px;color:var(--muted);margin:14px 0 0;padding-top:12px;border-top:1px solid #e6eef8}
.fretboard-note{cursor:pointer;transition:transform .08s ease,filter .08s ease}
.fretboard-note:hover{filter:brightness(.97);transform:translateY(-1px)}
.fretboard-open{stroke-width:2.5}
.fretboard-label{font-size:10px;font-weight:750;text-anchor:middle;dominant-baseline:middle;pointer-events:none}
.fretboard-caption{font-size:12px;line-height:1.55;color:var(--muted)}
.fretboard-chip{display:inline-block;font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--blue);background:#edf4fc;border:1px solid #d6e5f5;border-radius:999px;padding:4px 8px;margin:0 0 8px;font-weight:700}
.fretboard-shell{fill:url(#fb-bg);stroke:#c9d7e6;stroke-width:1}
.fretboard-fret{stroke:#b9c9db;stroke-width:1.25}
.fretboard-nut{stroke:#9eb2c9;stroke-width:4}
.fretboard-string{stroke:#6f8094;stroke-linecap:round}
.fretboard-position{fill:#dfe8f2}
.fretboard-position.double{fill:#d5e1ee}
.fretboard-stringtext,.fretboard-frettext{fill:#617387;font-size:11px}
.fretboard-root-ring{fill:none;stroke:#f4d8a6;stroke-width:3}
.fretboard-target-ring{fill:none;stroke:#dff3e9;stroke-width:3}
.fretboard-special-ring{fill:none;stroke:#f0c6c6;stroke-width:3}
@media(max-width:680px){.diagram-card{padding:18px}.diagram-grid{grid-template-columns:1fr}.fretboard-figure{padding:10px}}
@media(max-width:680px){.diagram-card{padding:18px}.diagram-grid{grid-template-columns:1fr}.fretboard-figure{padding:10px}}



/* Image-search-friendly fretboard: one visible PNG, transparent playable note hotspots. */
.fretboard-art{position:relative;width:100%;max-width:100%;line-height:0;border-radius:9px;overflow:visible}
.fretboard-image{display:block;width:100%;height:auto;max-width:100%;border:0}
.fretboard-hotspots{position:absolute;inset:0;pointer-events:none}
.fretboard-hotspot{position:absolute;left:var(--hx);top:var(--hy);transform:translate(-50%,-50%);width:6.6%;height:11%;min-width:0;min-height:0;aspect-ratio:auto;border:0;border-radius:50%;background:transparent;padding:0;cursor:pointer;pointer-events:auto;touch-action:manipulation}
.fretboard-hotspot:hover{outline:2px solid rgba(25,61,102,.68);outline-offset:2px}
.fretboard-hotspot:focus-visible{outline:3px solid #153e6b;outline-offset:3px;background:rgba(255,255,255,.14)}
.fretboard-image[loading="lazy"]{content-visibility:auto}
@media(max-width:680px){.fretboard-art{min-width:250px}.fretboard-figure{overflow-x:auto}}


/* Crisp scalable SVG diagram with PNG fallback; same single visible image. */
.fretboard-picture{display:block;width:100%;height:auto;line-height:0}
.fretboard-picture .fretboard-image{display:block;width:100%;height:auto;max-width:100%}

/* Corrective release: hotspot rectangles stay inside separate fret/string cells.
   On phones the disclosure below provides larger, 44px-high accessible controls. */
.fretboard-art .fretboard-hotspot{min-width:0!important;min-height:0!important;width:6.6%;height:11%;aspect-ratio:auto}
.fretboard-note-list{margin:12px 0 0;border-top:1px solid #e0e8f2}
.fretboard-note-list summary{font-size:13px;font-weight:650;padding:9px 0;color:#23527e}
.fretboard-note-buttons{display:grid;grid-template-columns:repeat(auto-fit,minmax(132px,1fr));gap:8px;margin:4px 0 12px}
.fretboard-note-buttons button{min-height:44px;padding:9px 10px;background:#eff5fc;border:1px solid #d1deed;border-radius:8px;color:#193d66;font-size:12px;text-align:left;font-weight:600;cursor:pointer;touch-action:manipulation}
.fretboard-note-buttons button:hover{background:#daeafb}
.fretboard-note-buttons button:focus-visible,.fretboard-hotspot:focus-visible{outline:3px solid #bf8648;outline-offset:1px}
.fretboard-hotspot{touch-action:manipulation;-webkit-tap-highlight-color:rgba(25,61,102,.12)}
.about-section{max-width:780px}
@media(max-width:360px){.fretboard-note-buttons{grid-template-columns:1fr 1fr}.fretboard-note-buttons button{font-size:11px;padding:7px}}