:root{color-scheme:light;--ink:#111;--muted:#666;--line:#bdbdbd;--soft:#f5f5f3;--active:#e9c46a}
*{box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;max-width:1200px;margin:32px auto;padding:0 16px;line-height:1.4;background:#fff;color:var(--ink)}
button,input{font:inherit}
.intro{margin-bottom:22px}.intro h1{font-size:28px;line-height:1.15;margin:0 0 8px}.intro p{font-size:14px;color:#333;margin:0}
.toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:18px}.segmented{display:inline-flex;border:1px solid var(--ink);border-radius:999px;padding:3px;background:#fff}.instrument-tab{border:0;border-radius:999px;background:#fff;padding:7px 15px;cursor:pointer;color:var(--ink)}.instrument-tab.active{background:var(--ink);color:#fff}.pill{border:1px solid var(--ink);border-radius:999px;background:#fff;padding:8px 13px;cursor:pointer}.volume{display:flex;align-items:center;gap:8px;font-size:13px;color:#333}.volume input{width:110px;accent-color:#111}
.readout{display:flex;justify-content:space-between;align-items:baseline;gap:12px;border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:15px;font-size:13px;color:var(--muted)}#noteReadout{color:var(--ink);font-size:15px;text-align:right}
.instrument-panel{margin-top:4px}.scroll-hint{font-size:12px;color:var(--muted);margin:0 0 9px}.instrument-scroll{overflow-x:auto;overflow-y:hidden;padding:3px 1px 15px;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch}
.guitar-scroll{width:min(100%,896px)}
.fretboard{position:relative;display:grid;grid-template-columns:54px repeat(22,70px);grid-template-rows:25px repeat(6,48px);width:max-content;min-width:100%;background:#f7f7f5;border:1px solid #999;border-radius:8px;overflow:hidden;user-select:none;touch-action:pan-x}.fret-number{display:flex;align-items:center;justify-content:center;background:#fff;color:#777;font-size:11px;border-bottom:1px solid #999}.fret-number.open{border-right:4px solid #eee}.fret-cell{position:relative;border-right:2px solid rgba(80,80,80,.35);display:flex;align-items:center;justify-content:center;cursor:pointer;touch-action:none}.fret-cell.open{background:#fff;border-right:4px solid #e6e6e6}.fret-cell::after{content:"";position:absolute;left:0;right:0;top:50%;height:var(--string-size);transform:translateY(-50%);background:#6f675b;box-shadow:0 1px rgba(255,255,255,.65);pointer-events:none}.fret-cell .note-label{position:relative;z-index:2;display:flex;align-items:center;justify-content:center;min-width:26px;height:26px;padding:0 5px;border-radius:999px;background:rgba(255,255,255,.9);font-size:11px;font-weight:600;opacity:0;transition:.08s}.show-labels .note-label{opacity:1}.fret-cell.active .note-label{opacity:1;background:#111;color:#fff;transform:scale(1.08)}.fret-cell.marker-single,.fret-cell.marker-double{background-image:radial-gradient(circle at 50% 50%,rgba(60,60,60,.22) 0 5px,transparent 6px)}.fret-cell.marker-double{background-image:radial-gradient(circle at 50% 27%,rgba(60,60,60,.22) 0 4px,transparent 5px),radial-gradient(circle at 50% 73%,rgba(60,60,60,.22) 0 4px,transparent 5px)}
.piano-scroll{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:16px 14px 22px}.piano{position:relative;height:260px;width:2080px;user-select:none;touch-action:pan-x}.key{position:absolute;top:0;cursor:pointer;border:1px solid #777;touch-action:none}.white-key{width:40px;height:250px;background:#fff;border-radius:0 0 6px 6px;z-index:1}.black-key{width:25px;height:155px;background:#171717;border-radius:0 0 5px 5px;z-index:2;transform:translateX(-12.5px);border-color:#000;box-shadow:0 4px 6px rgba(0,0,0,.22)}.key.active.white-key{background:#f1d992}.key.active.black-key{background:#b78d25}.key-label{position:absolute;bottom:10px;width:100%;text-align:center;font-size:10px;color:#666;pointer-events:none}.black-key .key-label{bottom:8px;color:#eee}.piano:not(.show-labels) .key-label{display:none}
footer{border-top:1px solid var(--line);margin-top:28px;padding:16px 0 30px;color:var(--muted);font-size:12px}
@media(max-width:600px){body{margin-top:22px}.readout{align-items:flex-start;flex-direction:column}.guitar-scroll{width:min(100%,626px)}.fretboard{grid-template-columns:48px repeat(22,48px);grid-template-rows:24px repeat(6,44px)}.toolbar{gap:9px}.piano{height:230px}.white-key{height:220px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}