:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color-scheme:dark;--bg:#0d171d;--surface:#142830;--panel:#1b343c;--line:#38515b;--ink:#f4f7fa;--muted:#b7cad1;--accent:#9ee4c8;--yellow:#ffd598}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);min-height:100vh}button,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.48;cursor:not-allowed}a{color:var(--accent)}a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}.shell{max-width:1150px;margin:auto;padding:23px 27px 48px}header{display:flex;justify-content:space-between;gap:16px;align-items:center;flex-wrap:wrap;font-size:12px;color:var(--muted);padding:0 0 20px}header a{text-decoration:none;font-weight:800}.hero{padding:22px 0 27px}.eyebrow{font-size:11px;color:var(--accent);letter-spacing:.14em;text-transform:uppercase;font-weight:850}h1{font-size:clamp(30px,4.2vw,51px);letter-spacing:-.045em;line-height:1.1;margin:11px 0}h2{font-size:23px;letter-spacing:-.02em;margin:0 0 13px}h3{font-size:16px}p{line-height:1.58;color:var(--muted);font-size:14px;max-width:820px}.tabs{display:flex;gap:7px;margin:4px 0 18px;flex-wrap:wrap}.tabs button{border:1px solid transparent;border-radius:999px;padding:11px 16px;background:transparent;color:var(--muted);font-size:12px;font-weight:800}.tabs button[aria-pressed="true"]{background:var(--accent);color:#102620}.tabs button:hover:not([aria-pressed="true"]){border-color:var(--line)}.screen[hidden]{display:none}.card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:27px;min-height:310px}.card p{margin:4px 0 18px}select,button:not(.tabs button):not(.fret){background:var(--panel);border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:11px 14px;font-size:13px}button:not(.tabs button):not(.fret):hover{border-color:var(--accent)}label{font-size:13px;color:var(--muted)}select{display:block;margin:8px 0 15px;max-width:100%;min-width:230px}.readout{margin:18px 0 8px;padding:13px 16px;border:1px solid var(--line);border-radius:12px;background:var(--panel);font-size:14px;min-height:45px}.readout[data-tone="good"]{border-color:#78cbb0;color:#aff3d9}.readout[data-tone="error"]{border-color:#f4b0a4}.controls{display:flex;gap:22px;flex-wrap:wrap}.controls input{accent-color:var(--accent)}.fret-scroll{max-width:100%;overflow:auto;padding:5px 0 12px}.fretboard{display:grid;grid-template-columns:55px repeat(13,minmax(65px,1fr));min-width:970px;border:1px solid #546366;border-radius:13px;overflow:hidden;background:linear-gradient(100deg,#3c2923,#8d5933 48%,#422a24)}.fret-head{font-size:10px;background:#172a31;color:#b9cdd5;text-align:center;padding:10px 3px}.fret-head:nth-child(1){text-align:left;padding-left:14px}.string-label{padding:13px 12px;text-align:center;background:#192d35;color:var(--accent);font-size:12px;font-weight:800;border-top:1px solid #576461}.fret{border:0;border-left:3px solid #b9bfc3;border-top:1px solid #7a7b78;border-radius:0;padding:12px 1px;background:transparent;color:#fff6dc;min-height:47px;font-size:11px;font-weight:800;position:relative}.fret:before{content:"";position:absolute;top:50%;height:2px;left:0;right:0;background:#dbcdb0;pointer-events:none}.fret span{position:relative;background:#403e36;border-radius:999px;padding:5px 5px;display:inline-block;min-width:33px}.fret[aria-pressed="true"] span{background:var(--accent);color:#173025}.fret:hover span{background:#fff2bc;color:#262321}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 19px}.chip{padding:11px 13px;min-width:43px;text-align:center;border:1px solid var(--line);border-radius:10px;background:var(--panel);font-size:12px}.chip.done{color:var(--accent);border-color:var(--accent)}.chip.current{color:#17271e;background:var(--yellow);border-color:var(--yellow);font-weight:900}.fine{font-size:12px;color:#a4bac5}.lesson-meta{font-size:12px;color:var(--accent);font-weight:800}.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap}#chord-grid{display:grid;grid-template-columns:repeat(6,minmax(37px,1fr));gap:8px;max-width:530px;margin:16px 0}.chord-string{border:1px solid var(--line);border-radius:10px;padding:12px 6px;text-align:center;background:var(--panel);min-height:85px}.chord-string b,.chord-string span{display:block}.chord-string b{font-size:18px;color:var(--yellow);margin:8px 0}.chord-string span{font-size:11px;color:var(--muted)}#detected-note{font-size:34px;font-weight:900;color:var(--accent);margin-top:15px;min-height:50px}.tuner-cents{font-size:13px;margin:4px 0 13px;color:var(--muted)}#progress-readout p{margin:8px 0}footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:15px;padding:27px 4px 0;font-size:11px;color:#99aab4}@media(max-width:600px){.shell{padding:15px 13px 35px}.hero{padding:13px 0 19px}.card{padding:19px 16px}.tabs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:4px}.tabs button{padding:9px 3px!important;font-size:10px}.fretboard{min-width:870px;grid-template-columns:46px repeat(13,62px)}.fret{min-height:51px}select{min-width:0;width:100%}}

/* Guitar Lab 0.11 — focused tuning and progress controls */
.lesson-listening{margin:14px 0 10px}
.tuner-choices{max-width:360px}
.tuner-meter{max-width:650px;border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:19px;margin:12px 0 18px}
.tuner-track{height:20px;position:relative;background:linear-gradient(90deg,#93413d 0%,#b58a43 35%,#528872 45%,#528872 55%,#b58a43 65%,#93413d 100%);border-radius:999px;overflow:visible}
.tuner-center{height:32px;width:3px;background:#ffffffb8;position:absolute;left:50%;top:-6px}
.tuner-needle{position:absolute;left:50%;width:5px;height:32px;top:-6px;background:#fff;border-radius:3px;transform:translateX(-50%);box-shadow:0 0 2px #000}
.tuner-scale{display:flex;justify-content:space-between;gap:10px;margin:12px 0;color:var(--muted);font-size:11px}
.tuner-guidance{font-size:13px;line-height:1.5;color:var(--muted);min-height:22px}
.tuner-guidance[data-tuning="good"]{color:var(--accent);font-weight:800}
.tuner-guidance[data-tuning="bad"]{color:var(--yellow)}
#detected-note{font-variant-numeric:tabular-nums}
#import-status{margin-top:9px;min-height:15px}

.lesson-guidance{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin:14px 0 8px}
.lesson-guidance strong{color:var(--accent)}.lesson-guidance span{font-size:12px;color:var(--muted)}
.lesson-fretboard{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px;margin:14px 0}
.lesson-fretboard summary{font-weight:800;font-size:13px;cursor:pointer}
.lesson-fretboard p{margin:8px 0 12px}

.practice-summary{border-left:3px solid var(--accent);padding:9px 12px;margin:12px 0;color:var(--muted);font-size:13px}
#hear-target{margin-bottom:10px}

#lesson-path{color:var(--accent);font-size:12px;font-weight:750;margin-top:4px}
#lesson-next:disabled{opacity:.45}