:root{--bg:#f7f8f5;--ink:#15202b;--muted:#69717c;--green:#244d3b;--line:#dfe4e1;--pink:#f8dce5;--peach:#f9e0cd;--yellow:#fcf0bd;--mint:#d4eddf;--blue:#d5e9f8}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:15px}button,select,textarea{font:inherit}button,select,summary{cursor:pointer}button{transition:background .15s}button:hover{filter:brightness(.95)}button:focus-visible,select:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #83ad99;outline-offset:3px}header{max-width:1440px;margin:auto;padding:25px 4%;display:flex;align-items:center;justify-content:space-between}header>span{color:var(--muted);font-size:14px}.brand{display:flex;align-items:center;gap:11px;font-size:27px;font-weight:750;letter-spacing:-1px;color:var(--green);text-decoration:none}.brand svg{width:32px;fill:none;stroke:currentColor;stroke-width:2}main{max-width:1320px;margin:auto;padding:12px 28px 0}.intro{text-align:center;margin:14px 0 25px}h1{font-size:38px;letter-spacing:-1.4px;margin:0 0 10px;line-height:1.2}.intro p{font-size:19px;color:var(--muted);margin:0}.tracks{display:flex;margin:0 auto 22px;max-width:610px;border:1px solid #d2dad5;border-radius:8px;overflow:hidden}.tracks button{flex:1;padding:13px 8px;border:0;border-right:1px solid var(--line);background:transparent;color:#555e69;font-weight:600}.tracks button:last-child{border:0}.tracks button[aria-pressed=true]{background:var(--green);color:white}.workspace{display:grid;grid-template-columns:minmax(0,2.08fr) minmax(280px,1fr);gap:20px;align-items:start}.practice,aside{background:#fff;border:1px solid var(--line);border-radius:10px;padding:22px}.toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;padding-bottom:17px;border-bottom:1px solid var(--line)}select{max-width:78%;padding:11px 30px 11px 12px;border:1px solid #d7ddd9;border-radius:7px;color:var(--ink);background:#fff;font-weight:550;font-size:14px}.text-button{border:0;background:none;color:var(--green);white-space:nowrap;font-size:14px;font-weight:600}.metrics{display:flex;margin:18px 0}.metrics>div{flex:1;text-align:center;position:relative}.metrics>div+div:before{content:"";position:absolute;left:0;top:10px;height:32px;border-left:1px solid var(--line)}.metrics strong{display:block;font-size:25px;letter-spacing:-.5px}.metrics span{display:block;font-size:14px;color:var(--muted);margin-top:3px}.exercise{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:clamp(23px,2.5vw,34px);line-height:1.8;letter-spacing:.3px;white-space:pre-wrap;overflow-wrap:anywhere;color:#858b92;padding:20px 12px;max-height:240px;overflow:auto;min-height:100px;scroll-behavior:smooth}.exercise.long{font-size:21px;line-height:1.7}.exercise span.correct{color:var(--green)}.exercise span.wrong{color:#b62641;background:#ffe2e8}.exercise span.current{border-bottom:3px solid #3c8963;color:var(--green);background:#eaf3ed}.primary{width:100%;background:var(--green);border:1px solid var(--green);color:white;border-radius:7px;padding:14px 20px;font-weight:650}.feedback{font-size:13px;color:var(--muted);margin:5px 0 12px;min-height:18px}.feedback.error{color:#b62641}.progress{height:3px;background:#edf2ee;margin:12px 0 15px;border-radius:4px;overflow:hidden}#progress-fill{background:#64a582;width:0;height:100%}.key-row{display:flex;gap:4px;margin-bottom:5px}.key{flex:1;min-width:0;height:42px;background:#f4f5f4;border:1px solid #d9ddda;border-bottom-width:3px;border-radius:6px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:1px;color:#26352f;font-size:12px;position:relative}.key small{font-size:9px;opacity:.65}.key.home:after{content:"";height:2px;width:10px;position:absolute;bottom:5px;background:#73887b}.key[data-finger=lp],.key[data-finger=rp],.finger.lp,.finger.rp{background:var(--pink)}.key[data-finger=lr],.key[data-finger=rr],.finger.lr,.finger.rr{background:var(--peach)}.key[data-finger=lm],.key[data-finger=rm],.finger.lm,.finger.rm{background:var(--yellow)}.key[data-finger=li],.finger.li{background:var(--mint)}.key[data-finger=ri],.finger.ri{background:var(--blue)}.key.active{outline:2px solid var(--green);outline-offset:-2px;color:#123d28;font-weight:800;box-shadow:0 2px 5px #244d3b25}.keyboard-caption{display:flex;justify-content:space-between;gap:10px;color:var(--green);font-size:12px;margin-top:12px}.keyboard-caption label{color:var(--muted);white-space:nowrap}input[type=checkbox]{accent-color:var(--green);vertical-align:middle}aside h2{font-size:22px;letter-spacing:-.6px;color:var(--green);margin:4px 0 24px}.steps{list-style:none;counter-reset:steps;padding:0;margin:0}.steps li{display:flex;gap:15px;margin-bottom:24px;counter-increment:steps}.steps li:before{content:counter(steps);flex-shrink:0;background:var(--green);color:white;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-size:16px}.steps strong{font-size:15px;line-height:1.4}.steps p,aside details p{line-height:1.55;color:var(--muted);margin:5px 0 0;font-size:14px}.finger-section{border-top:1px solid var(--line);padding-top:18px}h3{font-size:14px;margin:0 0 15px;font-weight:600}h3 span{font-weight:400}.hands{display:flex;gap:18px;justify-content:space-around}.hand{flex:1;min-width:0}.hand>span{display:block;text-align:center;color:var(--muted);font-size:11px;margin-bottom:8px}.digits{display:flex;align-items:end;justify-content:center;gap:4px;height:72px}.finger{width:18%;border-radius:13px 13px 9px 9px;position:relative;background:#e8eae9;height:55px}.finger b{position:absolute;bottom:6px;width:100%;text-align:center;font-size:10px;font-weight:500}.finger.lp,.finger.rp{height:44px}.finger.lm,.finger.rm{height:70px}.finger.lr,.finger.rr{height:62px}.finger.thumb{height:31px}.finger.active{outline:2px solid var(--green);outline-offset:2px}.hand>small{display:block;text-align:center;font-size:10px;color:var(--muted);margin-top:8px}.tip{background:#eaf1ec;padding:15px;border-radius:9px;margin-top:23px;color:var(--green)}.tip strong{font-size:14px}.tip p{font-size:12px;line-height:1.5;color:#59675f;margin:5px 0 0}details{font-size:13px;line-height:1.6}aside details{margin-top:16px}summary{font-weight:600;color:var(--green)}textarea{width:100%;resize:vertical;padding:12px;border:1px solid #c7d4cb;border-radius:6px;line-height:1.6;background:#fafcf9;color:var(--ink);font-family:ui-monospace,monospace;outline-color:var(--green)}#input{font-size:16px;max-height:130px}#typing-wrap{margin-bottom:9px}.result{margin-top:16px;background:#eaf1ec;padding:16px;border-radius:7px;line-height:1.6;font-size:14px}.extras{margin-top:18px;display:grid;grid-template-columns:1fr 1fr;gap:20px}.extras details{border:1px solid var(--line);padding:15px 20px;border-radius:8px;background:#fff}.extras p{color:var(--muted)}.extras button{margin-top:8px;padding:10px}.history-row{padding:10px 0;border-bottom:1px solid var(--line);font-size:12px}.history-row span{display:block;color:var(--muted)}footer{text-align:center;color:var(--muted);font-size:11px;padding:22px}footer p{font-size:10px;margin-bottom:0}.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}@media(min-width:1450px){main{padding-top:24px}.intro{margin-bottom:30px}.exercise{padding-top:32px;padding-bottom:32px}.key{height:46px}}@media(max-width:900px){header{padding:20px 24px}header>span{font-size:12px}main{padding:10px 20px}.workspace{grid-template-columns:minmax(0,1fr)}aside{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}aside h2{grid-column:1/-1}.steps{grid-row:2/5}.finger-section{border-top:0;padding-top:0}.tip{margin-top:16px}.exercise{font-size:29px}}@media(max-width:540px){header>span{display:none}header{padding:18px 18px}.brand{font-size:24px}main{padding:10px 12px}.intro{margin:10px 0 22px}h1{font-size:29px;letter-spacing:-.9px}.intro p{font-size:15px;line-height:1.5}.tracks button{font-size:13px;padding:12px 4px}.practice,aside{padding:14px}.toolbar{gap:5px}select{font-size:12px;max-width:76%;padding-left:7px}.text-button{font-size:12px;padding:0}.exercise{font-size:24px;padding:16px 2px}.exercise.long{font-size:17px}.metrics strong{font-size:22px}.key-row{gap:2px;margin-bottom:3px}.key{height:32px;border-radius:4px;font-size:8px}.key small{font-size:7px}.keyboard-caption{font-size:10px}aside{display:block}aside h2{font-size:21px}.hands{max-width:320px;margin:auto}.finger-section{border-top:1px solid var(--line);padding-top:18px}.extras{grid-template-columns:1fr;gap:10px}.steps li{margin-bottom:20px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* Desktop proportions follow the full-screen design reference. */
@media(min-width:1100px){header{max-width:1505px}main{max-width:1440px}h1{font-size:42px;letter-spacing:-1px}.exercise:not(.long){font-size:44px}.key{height:46px}.steps strong{font-size:16px}.steps p{font-size:15px}.steps li{margin-bottom:26px}aside h2{font-size:24px}}
@media(min-width:1450px){main{padding-top:10px}.key{height:48px}}
.library-tools{display:flex;align-items:end;gap:16px;margin:0 0 16px;padding:0 2px}.library-tools label{display:flex;flex-direction:column;gap:6px;font-size:12px;font-weight:600;color:var(--muted)}.library-tools select{max-width:none;min-width:140px;padding:10px 30px 10px 12px}.library-tools input{font:inherit;font-size:14px;padding:11px 12px;border:1px solid #d7ddd9;border-radius:7px;background:white;color:var(--ink);width:100%;outline-color:var(--green)}.search-label{flex:1;max-width:410px}#lesson-count{font-size:12px;color:var(--muted);margin-left:auto;padding-bottom:12px;white-space:nowrap}.lesson-info{display:flex;align-items:start;justify-content:space-between;gap:12px;padding:12px 0 0;font-size:12px;color:var(--muted)}.lesson-info>span{white-space:nowrap;padding-top:2px}.lesson-info details{max-width:66%;text-align:right;font-size:12px}.lesson-info p{margin:8px 0;line-height:1.6}.lesson-info a{color:var(--green)}.exercise{position:relative}.library-tools select:disabled{opacity:.55;cursor:default}@media(max-width:540px){.library-tools{gap:8px;flex-wrap:wrap}.library-tools select{min-width:118px}.search-label{min-width:150px}#lesson-count{width:100%;padding:0;margin:0}.lesson-info{font-size:10px}.lesson-info details{font-size:11px}.lesson-info>span{white-space:normal}}