.intro-course{max-width:1080px;margin:0 auto;padding:24px 0 48px;color:#c8d3df;outline:none}.intro-course h1{font-size:28px;color:#00ffcc;font-weight:800;margin:4px 0 10px}.intro-course h2{font-size:22px;font-weight:700;color:#e3eaf3;margin:0 0 12px}.intro-course p{line-height:1.8;margin:8px 0}.intro-eyebrow{font:11px monospace;letter-spacing:3px;color:#8194aa}.intro-heading{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:28px}.intro-course a{color:#7ed9cb;text-decoration:none}.intro-steps{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:22px}.intro-course button,.intro-course .intro-primary{border:1px solid #344557;border-radius:7px;background:#151f2c;padding:10px 16px;cursor:pointer;font:inherit;color:#c8d3df;display:inline-block}.intro-course button:hover,.intro-course a:hover{border-color:#00ffcc;color:#00ffcc}.intro-course button:focus-visible,.intro-course a:focus-visible,.intro-course input:focus-visible{outline:2px solid #00ffcc;outline-offset:4px}.intro-course button:disabled{opacity:.35;cursor:not-allowed}.intro-steps button[aria-current="step"]{background:#113932;border-color:#00ffcc;color:#00ffcc}.intro-steps button span{margin-right:10px}.intro-steps a{margin-left:auto}.intro-panel{padding:30px;border:1px solid #293c50;border-radius:12px;background:#111a26}.intro-posture{display:grid;grid-template-columns:1fr 1.2fr;gap:32px;align-items:center;margin:26px 0}.intro-posture svg{width:100%;max-width:390px}.intro-posture label{display:flex;align-items:center;gap:12px;margin:18px 0;line-height:1.7}.intro-posture input{accent-color:#00ffcc;width:18px;height:18px;flex-shrink:0}.intro-course .intro-primary{background:#103e35;color:#7dffdf;border-color:#38ba9e;font-weight:700}.intro-note{font-size:13px;color:#8999ad}.intro-instruction{color:#8debd7;font-size:18px}.intro-instruction strong{color:#00ffcc}.intro-practice{position:relative;border:1px solid #293c50;background:#0c131e;border-radius:10px;margin:22px 0 18px;padding:20px;overflow:hidden}.intro-keyrow{display:flex;gap:5px;margin-bottom:5px}.intro-key{display:flex;justify-content:center;align-items:center;flex:1;min-width:0;height:42px;background:#182638;border:1px solid #314456;border-radius:5px;font:13px monospace;position:relative}.intro-key.space{flex:6}.intro-key.anchor:after{content:'';position:absolute;bottom:5px;width:12px;border-bottom:2px solid currentColor}.intro-key.target{background:#00ffcc;color:#0b2528;box-shadow:0 0 20px #00ffcc40}.intro-key.wrong{background:#8a3444;color:white}.intro-hands{display:flex;justify-content:center;gap:35px;text-align:center;padding:14px 0 4px;color:#95c7c1}.intro-hands>div{width:220px}.intro-hands svg{width:100%;height:140px}.intro-legend{text-align:center}.intro-legend b{color:#00ffcc;letter-spacing:3px}.intro-feedback{min-height:29px;color:#8debd7}.intro-controls{display:flex;align-items:center;flex-wrap:wrap;gap:10px;border-top:1px solid #293c50;margin-top:20px;padding-top:20px}.intro-controls>span{margin-left:auto;font-size:13px;color:#8da3ba}.intro-overlay{position:absolute;inset:0;background:#09111de8;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:1}.intro-sequence{display:flex;flex-wrap:wrap;gap:6px;margin:20px 0;padding:14px;background:#0c131e;border-radius:8px}.intro-sequence span{padding:5px 6px;font:18px monospace;color:#75879d;border-radius:3px}.intro-sequence .done{color:#59ac9c}.intro-sequence .current{color:#082a27;background:#00ffcc}.intro-complete{text-align:center;padding:40px 10px}.intro-complete .intro-primary{margin:24px 12px 0 0}@media(max-width:650px){.intro-course{padding-top:12px}.intro-heading{align-items:flex-start}.intro-heading h1{font-size:24px}.intro-panel{padding:18px 12px}.intro-posture{grid-template-columns:1fr;gap:8px}.intro-posture svg{max-width:280px;margin:auto}.intro-steps{gap:6px}.intro-steps button{font-size:12px;padding:8px}.intro-steps a{font-size:12px}.intro-practice{padding:8px}.intro-keyrow{gap:2px;margin-bottom:3px}.intro-key{height:30px;font-size:9px;border-radius:3px}.intro-hands{gap:10px}.intro-hands svg{height:auto}.intro-hands span{font-size:12px}.intro-controls button{font-size:12px;padding:8px}.intro-controls>span{width:100%;margin:4px 0}.intro-legend{font-size:12px}.intro-heading>a{font-size:12px;white-space:nowrap}.intro-sequence{gap:3px;padding:8px}.intro-sequence span{font-size:16px;padding:4px}.intro-eyebrow{letter-spacing:1px}}

/* Keep the keyboard and hand artwork together, as in the original introduction. */
.intro-course{max-width:1440px;padding:0 0 20px}.intro-heading{margin-bottom:12px}.intro-heading h1{font-size:25px;margin:2px 0 4px}.intro-heading p{margin:2px 0;font-size:13px}.intro-heading .intro-eyebrow{font-size:9px}.intro-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:18px;align-items:start}.intro-sidebar{background:#111a26;border:1px solid #293c50;border-radius:10px;padding:12px}.intro-steps{display:flex;flex-direction:column;align-items:stretch;gap:6px;margin:0}.intro-steps button{display:flex;align-items:center;gap:10px;text-align:left;padding:12px 8px;min-height:62px}.intro-steps button>span{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:28px;height:28px;border:1px solid #36505b;border-radius:50%;margin:0;font-size:12px}.intro-steps strong{display:block;font-size:14px}.intro-steps small{display:block;margin-top:4px;font-size:11px;color:#8c9bb0}.intro-sidebar-note{margin:12px 4px 0;padding-top:10px;border-top:1px solid #293c50;font-size:12px;color:#8498aa}.intro-sidebar-note p{line-height:1.7}.intro-panel{padding:18px;min-width:0}.intro-panel>h2{font-size:21px;margin-bottom:8px}.intro-explanation{max-width:740px;margin:4px auto 10px;text-align:center}.intro-explanation p{margin:3px 0;line-height:1.5}.intro-explanation .intro-instruction{font-size:20px;font-weight:700}.intro-sequence{margin:8px 0;padding:7px;gap:4px}.intro-sequence span{font-size:16px;padding:3px 5px}.intro-practice{margin:10px auto 8px;max-width:1000px;padding:12px;isolation:isolate}.intro-practice.with-hands{padding-bottom:88px}.intro-key{height:36px;font-size:12px;border-color:color-mix(in srgb,var(--finger-colour,#314456) 30%,#293b4b);background:color-mix(in srgb,var(--finger-colour,#314456) 8%,#111a26)}.intro-key.target{z-index:2;color:var(--finger-colour,#00ffcc);background:color-mix(in srgb,var(--finger-colour,#00ffcc) 20%,#111a26);border:2px solid var(--finger-colour,#00ffcc);box-shadow:0 0 18px color-mix(in srgb,var(--finger-colour,#00ffcc) 28%,transparent);font-weight:800;font-size:19px}.intro-key.wrong{background:#8a3444;color:white}.intro-hands{position:absolute;inset:0;display:block;margin:0;padding:0;pointer-events:none;z-index:1}.intro-hands img{position:absolute;width:95%;max-width:none;height:auto;top:88px;opacity:.44;pointer-events:none}.intro-left-hand{left:-2.1%;clip-path:inset(0 50% 0 0);transform:translateY(-6%) rotate(11deg)}.intro-right-hand{left:-2.7%;clip-path:inset(0 0 0 50%);transform:translateY(-6%) rotate(-11deg)}.intro-legend{margin:5px 0!important;font-size:12px}.intro-note{line-height:1.5!important;font-size:12px}.intro-feedback{min-height:24px;margin:6px 0!important;font-size:13px}.intro-controls{margin-top:10px;padding-top:10px;gap:8px}.intro-controls button{padding:8px 12px;font-size:12px}.intro-overlay{z-index:3}.intro-posture{margin:16px 0;gap:20px}.intro-posture label{font-size:14px;margin:12px 0}
@media(max-width:1050px){.intro-layout{grid-template-columns:180px minmax(0,1fr);gap:12px}.intro-steps strong{font-size:13px}.intro-steps small{font-size:10px}.intro-panel{padding:14px}.intro-hands img{top:76px}.intro-key{height:32px;font-size:10px}.intro-explanation .intro-instruction{font-size:17px}}
@media(max-width:760px){.intro-layout{grid-template-columns:1fr;gap:10px}.intro-sidebar{padding:8px}.intro-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px}.intro-steps button{min-height:48px;padding:7px 5px;gap:5px}.intro-steps button>span{width:20px;height:20px;font-size:10px}.intro-steps strong{font-size:11px}.intro-steps small{display:none}.intro-sidebar-note{display:none}.intro-heading h1{font-size:23px}.intro-heading p{font-size:12px}.intro-panel{padding:12px}.intro-explanation .intro-instruction{font-size:16px}.intro-practice.with-hands{padding-bottom:60px}.intro-hands img{top:68px}.intro-key{height:28px;font-size:9px}.intro-key.target{font-size:15px}.intro-legend b{letter-spacing:1px}.intro-explanation{margin:4px auto 8px}}
.intro-heading .intro-eyebrow{display:none}.intro-heading{margin-bottom:10px}.intro-practice.with-hands{padding-bottom:54px}

/* Match the original introduction's desktop keyboard and hand dimensions. */
.intro-course{width:100%;max-width:none}
@media(min-width:761px){
  .intro-layout{grid-template-columns:268px minmax(0,1fr);gap:20px}
  .intro-panel{padding:24px}
  .intro-panel>h2,.surround-heading h2{font-size:24px}
  .intro-course .intro-practice{width:100%;max-width:1000px;padding:0;border:0;border-radius:0;background:transparent;overflow:visible}
  .intro-course .intro-practice.with-hands{height:400px;padding:0 0 120px}
  .intro-course .intro-key{height:52px;font-size:14px}
  .intro-course .intro-key.target{font-size:22px}
  .intro-course .intro-keyrow:last-child{margin-bottom:0}
  .intro-course .surround-key-legend{position:absolute;right:0;bottom:8px;left:0}
}

/* Each hand is fitted to the measured A/S/D/F or J/K/L/; key centres. */
.intro-course .intro-hands{overflow:hidden}
.intro-course .intro-hands img{width:1860px;height:846px;max-width:none;top:0;left:0;transform-origin:0 0;visibility:hidden}
.intro-course .intro-hands-switch{display:inline-flex;align-items:center;gap:8px;border-color:transparent;background:transparent;white-space:nowrap}
.intro-switch-track{display:inline-flex;align-items:center;width:34px;height:20px;padding:3px;border-radius:12px;background:#405064;transition:background .15s}
.intro-switch-track>span{width:14px;height:14px;border-radius:50%;background:#c8d3df;transition:transform .15s}
.intro-hands-switch[aria-checked="true"] .intro-switch-track{background:#157563}
.intro-hands-switch[aria-checked="true"] .intro-switch-track>span{transform:translateX(14px);background:#9cffe5}
@media(prefers-reduced-motion:reduce){.intro-switch-track,.intro-switch-track>span{transition:none}}