@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/dm-sans-latin-ext-400-normal-BtiwyxMk.woff2) format("woff2"),url(/assets/dm-sans-latin-ext-400-normal-BjWJ59Pq.woff) format("woff");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/dm-sans-latin-400-normal-CW0RaeGs.woff2) format("woff2"),url(/assets/dm-sans-latin-400-normal-BwCSEQnW.woff) format("woff");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/dm-sans-latin-ext-500-normal-BJfUCQsA.woff2) format("woff2"),url(/assets/dm-sans-latin-ext-500-normal-DR84L5F-.woff) format("woff");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/dm-sans-latin-500-normal-B9HHJjqV.woff2) format("woff2"),url(/assets/dm-sans-latin-500-normal-Dr3UlScf.woff) format("woff");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/dm-sans-latin-ext-600-normal-4vooXBpG.woff2) format("woff2"),url(/assets/dm-sans-latin-ext-600-normal-DRtaDpgU.woff) format("woff");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/dm-sans-latin-600-normal-Aqo67rzb.woff2) format("woff2"),url(/assets/dm-sans-latin-600-normal-BmdmIIQ2.woff) format("woff");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:700;src:url(/assets/dm-sans-latin-ext-700-normal-CJIcxD6K.woff2) format("woff2"),url(/assets/dm-sans-latin-ext-700-normal-BLI3TTWz.woff) format("woff");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:700;src:url(/assets/dm-sans-latin-700-normal-DvUfVpUG.woff2) format("woff2"),url(/assets/dm-sans-latin-700-normal-CUSSCpQX.woff) format("woff");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Newsreader;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/newsreader-vietnamese-500-normal-CL6a8tp2.woff2) format("woff2"),url(/assets/newsreader-vietnamese-500-normal-BEAbKU8A.woff) format("woff");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Newsreader;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/newsreader-latin-ext-500-normal-BNHmvKvI.woff2) format("woff2"),url(/assets/newsreader-latin-ext-500-normal-CZruMFou.woff) format("woff");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Newsreader;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/newsreader-latin-500-normal-B66TYsaK.woff2) format("woff2"),url(/assets/newsreader-latin-500-normal-DFwuUcdu.woff) format("woff");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{font-family:DM Sans,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none;--bg: #f7f6f1;--ink: #232323;--muted: #636462;--line: #dcded6;--accent: #244ce1;--panel: #fff;--soft: #edf0fa;--on-accent: white;font-size:16px}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-underline-offset:4px}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}button,.button{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:8px;padding:12px 18px;min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:600;text-decoration:none;transition:transform .15s,background .15s}button:hover,.button:hover{filter:brightness(.97)}button:active,.button:active{transform:translateY(1px)}.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}.quiet{background:transparent}.small{padding:7px 12px;min-height:38px;font-size:.84rem}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.skip{position:absolute;left:16px;top:-70px;background:var(--panel);padding:12px;z-index:99}.skip:focus{top:8px}.wrap{width:min(1180px,calc(100% - 64px));margin:auto}.site-header{height:88px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:22px}.brand{font-weight:700;font-size:1.5rem;text-decoration:none;display:flex;gap:11px;align-items:center;letter-spacing:-.06em}.brand-mark{background:var(--accent);color:var(--on-accent);width:34px;height:34px;display:grid;place-items:center;border-radius:8px;font-size:21px;letter-spacing:0}.site-header nav{display:flex;align-items:center;gap:26px;font-size:.88rem}.site-header nav a{text-decoration:none}.eyebrow{font-size:.72rem;font-weight:700;letter-spacing:.15em;text-transform:uppercase;color:var(--muted)}.hero{padding:64px 0 42px;max-width:900px}.hero h1{font-size:clamp(2.5rem,5.5vw,4.7rem);line-height:1.03;letter-spacing:-.055em;margin:17px 0 22px;font-weight:500}.hero p{max-width:650px;font-size:1.1rem;line-height:1.65;color:var(--muted);margin:0}.hero .pills{margin-top:25px}.pills{display:flex;gap:10px;flex-wrap:wrap}.pill{font-size:.73rem;padding:6px 10px;border:1px solid var(--line);border-radius:30px;display:inline-block;color:var(--muted)}.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px}.panel-pad{padding:27px}h2,h3,h4{letter-spacing:-.035em;line-height:1.2}h2{font-size:1.7rem;margin:0 0 18px}h3{font-size:1.15rem}p{line-height:1.65}.muted{color:var(--muted)}.micro{font-size:.78rem;line-height:1.6}.field{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}.field label,.field-label{font-size:.8rem;font-weight:600}.field input,.field select,.field textarea,input.control,select.control{width:100%;border:1px solid var(--line);border-radius:7px;padding:11px 12px;min-height:44px;background:var(--bg);color:var(--ink)}.field textarea{resize:vertical}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.between{justify-content:space-between}.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}.wide{width:100%}.status{font-size:.84rem;line-height:1.5;color:var(--muted);min-height:1.3em}.error{color:#ab2b28}.success{color:#217653}.section{padding:65px 0;border-top:1px solid var(--line);margin-top:55px}.section-title{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:25px}.section-title h2{margin:0}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.guide-card{border:1px solid var(--line);border-radius:10px;padding:24px;text-decoration:none;background:var(--panel)}.guide-card .num{font-size:.74rem;color:var(--muted)}.guide-card h3{font-size:1.3rem;line-height:1.25;margin:28px 0 13px}.guide-card p{font-size:.86rem;color:var(--muted);margin:0}.guide-card .arrow{display:block;margin-top:24px;color:var(--accent)}.site-footer{padding:35px 0 45px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:.8rem;color:var(--muted)}.footer-links{display:flex;gap:22px;flex-wrap:wrap}.article{max-width:740px;margin:60px auto 90px}.article h1{font-size:clamp(2.3rem,5vw,3.5rem);font-weight:500;letter-spacing:-.05em;line-height:1.1}.article .lede{font-size:1.22rem;color:var(--muted)}.article h2{font-size:1.55rem;margin-top:42px}.article li{line-height:1.75;margin:9px 0}.article table{width:100%;border-collapse:collapse;font-size:.9rem}.article th,.article td{text-align:left;padding:12px;border:1px solid var(--line)}.article code{overflow-wrap:anywhere}.callout{padding:20px 23px;background:var(--soft);border-left:3px solid var(--accent);margin:25px 0}.callout p{margin:0}.article .button{margin-top:24px}.notice{padding:15px 18px;border-radius:8px;background:var(--soft);font-size:.83rem;line-height:1.6}.empty{padding:40px;text-align:center;color:var(--muted)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}.tool{scroll-margin-top:20px}.loading{padding:45px}.article img{max-width:100%}@media(max-width:760px){.wrap{width:calc(100% - 32px)}.site-header{height:74px}.site-header nav{gap:15px;font-size:.78rem}.site-header nav a.hide-mobile{display:none}.brand{font-size:1.25rem}.brand-mark{width:29px;height:29px}.hero{padding:40px 0 30px}.hero p{font-size:1rem}.guide-grid{grid-template-columns:1fr}.guide-card h3{margin-top:18px}.section{margin-top:38px;padding:40px 0}.section-title{align-items:start}.panel-pad{padding:20px}.site-footer{align-items:start;flex-direction:column}.article{margin-top:38px}.two{gap:12px}.article table{font-size:.77rem}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}:root{--bg: #151918;--ink: #e8ece7;--muted: #a0aca4;--line: #39433e;--accent: #d6ee75;--soft: #262e26;--panel: #1d2420;--on-accent: #1c2818}.site-header{border-color:#323a35}.brand{font-weight:600;letter-spacing:-.07em}.brand-mark{border-radius:50%;font-size:25px}.hero{max-width:900px;padding:58px 0 42px}.hero h1{font-weight:500;font-size:clamp(3rem,6vw,5.2rem);letter-spacing:-.065em;max-width:850px}.hero em{font-style:normal;color:var(--accent)}.hero p{max-width:590px}.hero .pills{display:none}.practice-shell{display:grid;grid-template-columns:295px 1fr;border:1px solid var(--line);border-radius:15px;background:#1c231f;overflow:hidden}.practice-settings{padding:29px;border-right:1px solid var(--line);background:#202823}.practice-settings .eyebrow{font-size:.62rem;color:#b0bdaf}.practice-settings h2{font-size:1.75rem;font-weight:500;line-height:1.2;margin:20px 0 30px}.practice-settings input,.practice-settings select{color-scheme:dark}.practice-settings .quiet{margin-top:12px}.practice-settings .field{margin-bottom:18px}.practice-settings .field label{font-weight:400;color:#c4cfc5}.settings-toggles{margin-top:25px;padding-top:21px;border-top:1px solid var(--line);display:grid;gap:16px;font-size:.72rem;color:var(--muted)}.settings-toggles label{display:flex;align-items:center;gap:8px}.settings-toggles input{accent-color:var(--accent)}.practice-stage{padding:27px 30px 23px;min-width:0;position:relative}.stage-top{gap:12px}.mode-badge{font-size:.59rem;letter-spacing:.09em;color:#c8d3c7;border:1px solid var(--line);padding:7px 9px;border-radius:4px}.stage-top .micro{font-size:.67rem}#question-head{padding:32px 0 24px}#question-head h2{font-size:2.4rem;font-weight:500;letter-spacing:-.06em;margin:14px 0}#question-head p{font-size:.85rem;color:var(--muted);margin:0;max-width:520px}.question-number{font-size:.65rem;letter-spacing:.13em;color:var(--muted);display:flex;justify-content:space-between}.question-number span{letter-spacing:0}.question-progress{height:3px;margin-top:13px;background:var(--line)}.question-progress span{display:block;background:var(--accent);height:3px;transition:width .2s}.neck-wrap{overflow-x:auto;position:relative;padding:0 0 13px;scrollbar-color:#566a55 #263029;scrollbar-width:thin}#neck{display:grid;grid-template-columns:44px repeat(calc(var(--columns) - 1),1fr);position:relative;isolation:isolate}.fret-number{text-align:center;font-size:.57rem;color:#b2beb2;padding:8px 0 14px}.string-label{font-size:.68rem;display:flex;align-items:center;justify-content:space-between;padding-right:12px;color:#93a394}.string-label b{font-size:.61rem;font-weight:400;color:#b9c4b7}.fret-cell{height:41px;position:relative;border-right:2px solid #707769;background:#313a2c;display:flex;justify-content:center;align-items:center}.fret-cell.open{background:transparent;border-right:5px solid #b8baa1}.string-line{position:absolute;top:50%;left:0;right:0;height:var(--weight);background:#b9b298;box-shadow:0 1px 1px #0005}.inlay{position:absolute;top:28px;font-size:16px;line-height:12px;color:#717b62;z-index:-0}.note-dot{background:var(--accent);color:#1d2816;width:31px;height:31px;border-radius:50%;display:grid;place-items:center;font-size:.9rem;font-weight:700;z-index:1;box-shadow:0 0 0 5px #d6ee7514}.starter-note{display:flex;gap:20px;align-items:center;border:1px solid var(--line);padding:22px;border-radius:8px;margin:25px 0 28px}.example-note{font-size:2.4rem;color:var(--accent);min-width:36px}.starter-note strong{font-size:.85rem;font-weight:500}.starter-note p{font-size:.78rem;color:var(--muted);margin:7px 0 0}.stage-foot{display:flex;justify-content:space-between;gap:15px;font-size:.6rem;color:#a6b3a4;border-top:1px solid var(--line);padding-top:18px}.stage-foot span:first-child{color:var(--accent)}.answers{display:flex;gap:9px;flex-wrap:wrap;margin-top:25px}.answers button{width:52px;height:49px;font-size:1rem;background:#263027;border-color:#52604c;color:#e8ece7;padding:5px}.answers .correct{background:var(--accent);color:#202c17;border-color:var(--accent);opacity:1}.answers .wrong{background:#5e332d;color:#ffe3d9;opacity:1;border-color:#d2937e}.answer-feedback{min-height:94px;padding:18px 0 8px}.answer-feedback strong{font-weight:500;font-size:.95rem;color:var(--accent)}.answer-feedback p{font-size:.8rem;color:var(--muted);line-height:1.6;margin:6px 0}#next{margin-bottom:25px;min-width:160px}.progress-section{display:flex;justify-content:space-between;gap:35px;padding:38px 0 20px}.progress-section h2{font-size:1.6rem;font-weight:500;margin:10px 0}.progress-numbers{display:flex;gap:45px;margin-bottom:20px}.progress-numbers strong{font-size:1.8rem;font-weight:500;display:block}.progress-numbers span{font-size:.67rem;color:var(--muted)}.progress-section button{font-size:.71rem;border-color:#52604c}.session-result{display:flex;align-items:center;gap:25px;margin:25px 0}.session-result>strong{font-size:4rem;line-height:1;font-weight:500;color:var(--accent)}.session-result small{font-size:1.7rem}.session-result>div{font-size:.9rem}.missed-list{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:20px}.missed-list span{padding:8px;background:#2d362a;border-radius:5px;font-size:.73rem}.session-result~.primary{margin-bottom:10px}.guide-card{background:#1c241f}.guide-card h3{font-weight:500}.guide-card .arrow{color:var(--accent)}.article h1,.article h2{font-weight:500}@media(max-width:1000px){.practice-shell{grid-template-columns:265px 1fr}.practice-settings,.practice-stage{padding:23px}.stage-top{align-items:start}.stage-top .micro{max-width:145px}.progress-numbers{gap:28px}}@media(max-width:760px){.hero{padding:42px 0 32px}.hero h1{font-size:3.3rem}.practice-shell{grid-template-columns:1fr}.practice-settings{border-right:0;border-bottom:1px solid var(--line);padding:23px}.practice-settings h2{font-size:1.5rem;margin:15px 0 23px}.practice-settings h2 br{display:none}.practice-settings .field{margin-bottom:15px}.settings-toggles{margin-top:18px;padding-top:18px;gap:14px}.practice-stage{padding:20px 16px}#question-head{padding:27px 0 15px}#question-head h2{font-size:2.05rem}.answers{gap:8px}.answers button{width:48px;height:46px}.progress-section{flex-direction:column;gap:15px}.progress-numbers{justify-content:space-between;gap:12px}.stage-foot{font-size:.57rem}.stage-top .micro{max-width:120px}.starter-note{padding:17px;gap:15px}.neck-wrap{margin-right:-5px}.progress-section .eyebrow{font-size:.65rem}}
