:root{--ink:#17201d;--muted:#65716d;--paper:#f4f2eb;--white:#fff;--line:#d8d8cf;--green:#1f7658;--green-dark:#124b3a;--lime:#d9ed84;--orange:#ef8b56;--board:#252b29;--fret:#737b77;--string:#b9bdbb}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Segoe UI","Microsoft YaHei",sans-serif;letter-spacing:0}button,select{font:inherit}.app-header{height:72px;padding:0 clamp(20px,5vw,72px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(244,242,235,.96)}.brand{display:flex;align-items:center;gap:10px}.brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--ink);color:var(--lime);font-family:serif;font-size:21px}.brand strong,.brand small{display:block}.brand 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button{border:0;background:transparent;padding:7px 10px;color:var(--muted);cursor:pointer}.view-switch button.active{background:var(--ink);color:var(--white)}.fretboard-wrap{overflow-x:auto;padding-bottom:8px}.fretboard{min-width:740px;display:grid;background:var(--board);border-radius:3px;overflow:hidden;padding:12px 0}.fret-cell{height:48px;border-right:2px solid var(--fret);position:relative;display:grid;place-items:center}.fret-cell:after{content:"";position:absolute;left:0;right:0;top:50%;height:1px;background:var(--string)}.fret-cell.open{border-right:5px solid #d7d2bb}.note{z-index:1;width:31px;height:31px;border-radius:50%;border:2px solid var(--green);background:var(--white);color:var(--green-dark);font-size:11px;font-weight:700;display:grid;place-items:center;cursor:pointer}.note.root{background:var(--lime);border-color:var(--green-dark)}.fret-label{height:25px;text-align:center;font-size:10px;color:var(--muted);padding-top:7px}.string-note{font-size:12px;color:var(--muted);margin:12px 0 0}.note-detail{min-height:24px;margin-top:14px;font-size:13px;color:var(--green-dark);font-weight:600}.learn-section{background:var(--paper)}.learn-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:70px}.learn-grid p,.learn-grid li{color:#46514d;line-height:1.75}.learn-grid ol{padding-left:20px}.learn-grid li{margin-bottom:10px}.formula{display:flex;gap:6px;flex-wrap:wrap;margin-top:24px}.interval-chip{min-width:45px;padding:9px 8px;text-align:center;border-bottom:3px solid var(--green);background:var(--white);font-size:12px}.interval-chip strong{display:block;font-size:15px}.practice-section{background:var(--green-dark);color:var(--white)}.practice-section .section-head p{color:#bcd0c8;margin:10px 0 0}.generate-btn{border:0;border-radius:4px;padding:12px 18px;background:var(--lime);color:var(--green-dark);font-weight:700;cursor:pointer}.practice-controls{max-width:680px;margin-bottom:24px}.practice-controls label{color:#bcd0c8}.practice-controls select{background:#1b5b47;color:var(--white);border-color:#34725e}.tab-shell{background:#f9f8f3;color:var(--ink);border-radius:5px;padding:20px;overflow-x:auto}.tab-meta{display:flex;justify-content:space-between;gap:15px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:16px;font-size:12px}.tab-meta span{color:var(--muted)}.tablature{min-width:700px;font-family:Consolas,monospace;font-size:14px;line-height:1.7;white-space:pre}.practice-tip{display:flex;gap:12px;margin-top:18px;color:#cadbd4;font-size:13px}.practice-tip 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