:root{--bg:#f5f6f8;--surface:#fff;--border:#d9dce1;--text:#1c1f24;--text-muted:#6b7280;--accent:#e94560;--accent-contrast:#fff;--accent-light:#fef0f2;--error-bg:#fdeceb;--error-border:#e5534b;--error-text:#8a1f16;--success:#22c55e;--warning:#f59e0b;--fretboard-bg:#d4a574;--fretboard-border:#8b6914;--fret-line:#999;--string-color:#666;--note-dot:#e94560;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#14161a;--surface:#1b1e24;--border:#2e333c;--text:#e6e8eb;--text-muted:#9aa1ac;--accent:#ff6b81;--accent-contrast:#0b1220;--accent-light:#2a1c20;--error-bg:#3a1c1c;--error-border:#e5534b;--error-text:#ffb4ac;--success:#4ade80;--warning:#fbbf24;--fretboard-bg:#6b4226;--fretboard-border:#4a2d18;--fret-line:#555;--string-color:#aaa;--note-dot:#ff6b81;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,Segoe UI,Roboto,sans-serif}.site-header{align-items:center;gap:10px;margin-bottom:12px;display:flex}.site-header__brand{color:var(--accent);white-space:nowrap;font-size:15px;font-weight:700;text-decoration:none}.site-header__brand:hover{text-decoration:underline}.site-header__divider{color:var(--text-muted);font-weight:400}.site-header__title{color:var(--text-muted);white-space:nowrap;font-size:15px;font-weight:600}.toolbar-spacer{flex:1}.btn,.toggle-btn{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:6px;padding:6px 12px;font-family:inherit;font-size:13px}.btn:hover,.toggle-btn:hover{border-color:var(--accent)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn--primary{background:var(--accent);color:var(--accent-contrast);border-color:var(--accent)}.btn--primary:hover{opacity:.9}.btn--large{padding:12px 28px;font-size:16px}.icon-btn{padding:6px 10px}.app{max-width:1000px;margin:0 auto;padding:20px 20px 48px}.guitar-app__title{color:var(--text);margin:8px 0 4px;font-size:28px}.guitar-app__intro{color:var(--text-muted);margin:0 0 20px;font-size:15px;line-height:1.5}.section-title{color:var(--text);margin:0 0 8px;font-size:22px}.section-intro{color:var(--text-muted);margin:0 0 20px;font-size:14px;line-height:1.5}.tab-nav{border-bottom:1px solid var(--border);gap:4px;margin-bottom:20px;display:flex;overflow-x:auto}.tab-nav__btn{color:var(--text-muted);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-bottom:3px solid #0000;align-items:center;gap:6px;padding:10px 16px;font-family:inherit;font-size:14px;font-weight:500;display:flex}.tab-nav__btn:hover{color:var(--text)}.tab-nav__btn--active{color:var(--accent);border-bottom-color:var(--accent)}.tab-nav__icon{font-size:16px}.tab-content{min-height:400px}.fretboard-container{width:100%}.fretboard-controls{margin-bottom:12px}.fretboard-toggle{color:var(--text);cursor:pointer;align-items:center;gap:6px;font-size:14px;display:flex}.fretboard-toggle input{cursor:pointer}.fretboard-scroll{padding-bottom:8px;overflow-x:auto}.fretboard{background:var(--fretboard-bg);border:2px solid var(--fretboard-border);border-radius:6px;flex-direction:column;min-width:680px;padding:8px 0;display:flex;position:relative}.fretboard__nut{z-index:1;background:#fff;width:4px;position:absolute;top:8px;bottom:8px;left:28px;box-shadow:1px 0 2px #0000004d}.fretboard__inlay{z-index:0;pointer-events:none;gap:12px;display:flex;position:absolute;top:50%;transform:translate(-50%,-50%)}.inlay-dot{background:#ffffff40;border-radius:50%;width:8px;height:8px}.fretboard__string-row{z-index:2;align-items:center;height:32px;display:flex;position:relative}.fretboard__string-label{text-align:center;width:28px;color:var(--text-muted);flex-shrink:0;font-size:12px;font-weight:700}.fret-cell{cursor:pointer;border-right:1px solid var(--fret-line);flex:1;justify-content:center;align-items:center;min-width:40px;height:100%;transition:background .15s;display:flex;position:relative}.fret-cell:hover{background:#ffffff26}.fret-cell--open{border-right:2px solid #fff}.fret-cell--highlighted{background:#e9456033}.fret-cell--highlighted:hover{background:#e945604d}.fret-cell__note{color:#fff;background:var(--note-dot);text-shadow:0 1px 2px #0006;border-radius:50%;justify-content:center;align-items:center;width:22px;height:22px;font-size:10px;font-weight:700;display:flex}.note-selector{flex-wrap:wrap;align-items:center;gap:6px;margin-top:12px;display:flex}.note-selector__label{color:var(--text-muted);font-size:13px}.note-chip{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:20px;padding:4px 10px;font-family:inherit;font-size:12px;font-weight:600}.note-chip:hover,.note-chip--active{border-color:var(--accent);background:var(--accent-light);color:var(--accent)}.chord-card{background:var(--surface);border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:8px;padding:12px;transition:box-shadow .2s;display:inline-flex}.chord-card:hover{box-shadow:0 2px 8px #0000001a}.chord-card__header{justify-content:space-between;align-items:center;display:flex}.chord-card__name{color:var(--text);font-size:16px;font-weight:700}.chord-card__play{background:var(--accent);color:var(--accent-contrast);cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-size:10px;display:flex}.chord-card__play:hover{opacity:.85}.chord-card__info{color:var(--text-muted);text-transform:capitalize;gap:8px;font-size:11px;display:flex}.chord-diagram{flex-direction:column;gap:4px;padding:4px;display:flex}.chord-diagram__labels{color:var(--text-muted);justify-content:space-between;padding:0 4px;font-size:14px;display:flex}.chord-diagram__string-label{text-align:center;width:16px;font-weight:600}.chord-diagram__string-label.muted{color:var(--error-border)}.chord-diagram__string-label.open{color:var(--text)}.chord-diagram__grid{border:1px solid var(--border);background:var(--surface);border-radius:4px;width:120px;height:140px;position:relative}.chord-diagram__fret-line{background:var(--border);height:1px;position:absolute;left:0;right:0}.chord-diagram__fret-line.nut{background:var(--text);height:3px}.chord-diagram__string-line{background:var(--border);width:1px;position:absolute;top:0;bottom:0}.chord-diagram__dot{background:var(--accent);width:22px;height:22px;color:var(--accent-contrast);z-index:2;border-radius:50%;justify-content:center;align-items:center;font-size:11px;font-weight:700;display:flex;position:absolute;transform:translate(-50%,-50%)}.chord-diagram__barre{background:var(--accent);opacity:.7;z-index:1;border-radius:9px;height:18px;position:absolute;transform:translateY(-50%)}.chord-diagram__bottom-labels{color:var(--text-muted);justify-content:space-between;padding:0 4px;font-size:11px;display:flex}.chord-diagram__position{color:var(--text-muted);font-size:11px;position:absolute;top:20px;left:-16px}.chord-library__controls{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:16px;display:flex}.chord-library__filters{gap:4px;display:flex}.filter-btn{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:20px;padding:6px 14px;font-family:inherit;font-size:13px}.filter-btn:hover{border-color:var(--accent)}.filter-btn--active{background:var(--accent);color:var(--accent-contrast);border-color:var(--accent)}.chord-library__search{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:6px;flex:1;min-width:150px;padding:6px 12px;font-family:inherit;font-size:13px}.chord-library__search:focus{border-color:var(--accent);outline:none}.chord-grid{flex-wrap:wrap;gap:12px;display:flex}.chord-library__empty{color:var(--text-muted);text-align:center;padding:40px}.lessons__header{margin-bottom:20px}.lessons__back,.song-view__back{margin-bottom:12px}.lessons__progress{background:var(--border);border-radius:14px;height:28px;margin-bottom:20px;position:relative;overflow:hidden}.lessons__progress-bar{background:var(--accent);border-radius:14px;height:100%;transition:width .3s}.lessons__progress-text{color:var(--text);text-shadow:0 1px 2px #ffffff80;font-size:12px;font-weight:600;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.lesson-step{background:var(--surface);border:1px solid var(--border);border-radius:10px;margin-bottom:16px;padding:20px}.lesson-step__title{color:var(--text);margin:0 0 12px;font-size:18px}.lesson-step__description{color:var(--text);margin:0 0 16px;font-size:15px;line-height:1.6}.lesson-step__chords{flex-wrap:wrap;align-items:flex-start;gap:12px;margin-bottom:16px;display:flex}.lesson-step__play-all{align-self:center}.lesson-step__tip{background:var(--accent-light);color:var(--text);border-radius:8px;align-items:flex-start;gap:8px;padding:12px;font-size:14px;line-height:1.5;display:flex}.tip-icon{flex-shrink:0}.lessons__nav{justify-content:space-between;gap:12px;display:flex}.lessons__list{flex-direction:column;gap:12px;display:flex}.lesson-card{background:var(--surface);border:1px solid var(--border);cursor:pointer;text-align:left;border-radius:10px;align-items:center;gap:12px;padding:16px 20px;font-family:inherit;transition:border-color .2s;display:flex}.lesson-card:hover{border-color:var(--accent)}.lesson-card__body{flex:1}.lesson-card__title{color:var(--text);margin:0 0 4px;font-size:16px}.lesson-card__desc{color:var(--text-muted);margin:0 0 6px;font-size:13px}.lesson-card__meta{align-items:center;gap:8px;display:flex}.lesson-card__badge{text-transform:capitalize;border-radius:12px;padding:2px 8px;font-size:11px;font-weight:600}.lesson-card__badge--beginner{color:var(--success);background:#22c55e26}.lesson-card__badge--intermediate{color:var(--warning);background:#f59e0b26}.lesson-card__steps{color:var(--text-muted);font-size:12px}.lesson-card__arrow{color:var(--text-muted);font-size:20px}.song-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;display:grid}.song-card{background:var(--surface);border:1px solid var(--border);cursor:pointer;text-align:left;border-radius:10px;padding:16px;font-family:inherit;transition:border-color .2s}.song-card:hover{border-color:var(--accent)}.song-card__title{color:var(--text);margin:0 0 4px;font-size:16px}.song-card__artist{color:var(--text-muted);margin:0 0 8px;font-size:13px}.song-card__meta{align-items:center;gap:8px;display:flex}.song-card__badge{text-transform:capitalize;border-radius:12px;padding:2px 8px;font-size:11px;font-weight:600}.song-card__badge--beginner{color:var(--success);background:#22c55e26}.song-card__badge--intermediate{color:var(--warning);background:#f59e0b26}.song-card__key{color:var(--text-muted);font-size:12px}.song-view__header{margin-bottom:16px}.song-view__meta{color:var(--text-muted);text-transform:capitalize;margin:4px 0 16px;font-size:14px}.song-view__chords{margin-bottom:24px}.song-view__chords h4{color:var(--text-muted);margin:0 0 8px;font-size:14px}.song-view__chord-grid{flex-wrap:wrap;gap:12px;display:flex}.song-view__missing-chord{background:var(--surface);border:1px dashed var(--border);color:var(--text-muted);border-radius:8px;padding:8px 12px;font-size:14px}.song-view__lyrics{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:20px}.song-section{margin-bottom:20px}.song-section__label{color:var(--accent);text-transform:uppercase;letter-spacing:.05em;margin:0 0 8px;font-size:14px;font-weight:600}.song-line{flex-wrap:wrap;align-items:baseline;min-height:28px;margin-bottom:4px;line-height:1.8;display:flex}.song-segment{flex-direction:column;display:inline-flex}.song-chord{color:var(--accent);cursor:pointer;min-width:20px;margin-bottom:2px;font-size:13px;font-weight:700;display:inline-block}.song-chord:hover{text-decoration:underline}.tuner__error{background:var(--error-bg);border:1px solid var(--error-border);color:var(--error-text);border-radius:10px;padding:16px}.tuner__display{flex-direction:column;align-items:center;gap:20px;display:flex}.tuner__gauge{width:100%;max-width:500px}.tuner__gauge-scale{justify-content:space-between;margin-bottom:4px;padding:0 10px;display:flex}.tuner__gauge-mark{color:var(--text-muted);font-size:11px}.tuner__gauge-mark--center{color:var(--success);font-weight:700}.tuner__gauge-track{background:var(--surface);border:1px solid var(--border);border-radius:20px;height:40px;position:relative;overflow:hidden}.tuner__needle{background:var(--accent);border-radius:2px;width:4px;transition:transform .1s ease-out;position:absolute;top:4px;bottom:4px;left:50%;transform:translate(0)}.tuner__needle.in-tune{background:var(--success)}.tuner__needle.close{background:var(--warning)}.tuner__gauge-center{background:var(--text-muted);opacity:.3;width:2px;position:absolute;top:0;bottom:0;left:50%}.tuner__note-display{background:var(--surface);border:2px solid var(--border);border-radius:12px;flex-direction:column;align-items:center;gap:4px;min-width:200px;padding:20px;display:flex}.tuner__note-display.in-tune{border-color:var(--success)}.tuner__note-display.close{border-color:var(--warning)}.tuner__note-name{color:var(--text);font-size:48px;font-weight:800}.tuner__note-display.in-tune .tuner__note-name{color:var(--success)}.tuner__note-full{color:var(--text-muted);font-size:14px}.tuner__freq{color:var(--text-muted);font-family:monospace;font-size:13px}.tuner__cents{color:var(--accent);font-size:16px;font-weight:600}.tuner__note-display.in-tune .tuner__cents{color:var(--success)}.tuner__status{color:var(--text-muted);margin-top:4px;font-size:14px;font-weight:600}.tuner__note-display.in-tune .tuner__status{color:var(--success)}.tuner__waiting{color:var(--text-muted);padding:20px;font-size:18px}.tuner__strings{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.tuner__string-btn{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:8px;flex-direction:column;align-items:center;gap:2px;padding:8px 14px;font-family:inherit;transition:border-color .2s;display:flex}.tuner__string-btn:hover{border-color:var(--accent)}.tuner__string-btn.active{border-color:var(--accent);background:var(--accent-light)}.tuner__string-num{color:var(--text-muted);font-size:11px}.tuner__string-note{color:var(--text);font-size:14px;font-weight:700}.tuner__hint{color:var(--text-muted);text-align:center;font-size:13px}@media (width<=640px){.app{padding:12px 12px 40px}.guitar-app__title{font-size:22px}.tab-nav__label{font-size:13px}.tab-nav__btn{padding:8px 10px}.chord-grid,.song-view__chord-grid{justify-content:center}.lessons__nav{flex-direction:column}.tuner__note-name{font-size:36px}}