:root{color-scheme:dark;--bg:#090b0f;--surface:#11151b;--raised:#181d25;--line:rgba(255,255,255,.1);--text:#f5f7fa;--muted:#8d96a3;--accent:#fb7185;--cyan:#67e8f9;--correct:#86efac}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{background:radial-gradient(circle at 26% 18%,rgba(251,113,133,.08),transparent 28%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}button{font:inherit}.app{min-height:100vh}.site-header{display:flex;align-items:center;justify-content:space-between;padding:20px clamp(20px,4vw,56px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:9px;color:var(--text);font-size:13px;font-weight:750;text-decoration:none}.brand-mark{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--cyan),var(--accent));box-shadow:0 0 14px rgba(251,113,133,.38)}.site-header p,.eyebrow{margin:0;color:var(--muted);font-size:9px;font-weight:750;letter-spacing:.16em;text-transform:uppercase}.page-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;padding:28px clamp(20px,4vw,56px) 24px}.page-heading h1{margin:7px 0 0;font-size:clamp(31px,4vw,55px);font-weight:610;letter-spacing:-.055em}.page-heading>p{max-width:500px;margin:0;color:var(--muted);font-size:13px;line-height:1.6}.anatomy-shell{margin:0 clamp(20px,4vw,56px) 44px;border:1px solid var(--line);border-radius:13px;overflow:hidden}.mode-bar{min-height:58px;display:flex;align-items:center;gap:12px;padding:9px 12px;background:var(--surface);border-bottom:1px solid var(--line)}.mode-switch{display:flex}.mode-switch button,.labels-toggle{height:38px;padding:0 15px;background:var(--raised);color:var(--muted);border:1px solid var(--line);cursor:pointer}.mode-switch button:first-child{border-radius:7px 0 0 7px}.mode-switch button:last-child{margin-left:-1px;border-radius:0 7px 7px 0}.mode-switch button.active{position:relative;background:rgba(251,113,133,.12);color:var(--accent);border-color:rgba(251,113,133,.5)}.labels-toggle{border-radius:7px}.progress{display:flex;align-items:center;gap:15px;margin-left:auto;color:var(--muted);font-size:10px}.progress strong{color:var(--correct);font-size:13px}.workspace{display:grid;grid-template-columns:minmax(390px,1fr) minmax(320px,.62fr);min-height:690px}.guitar-stage{position:relative;display:grid;place-items:center;overflow:hidden;background:linear-gradient(135deg,#ebecef,#fff);border-right:1px solid var(--line)}.guitar-stage>img{display:block;width:auto;height:min(74vw,760px);max-width:100%;object-fit:contain}.hotspots{position:absolute;inset:0}.hotspot{--x:50%;--y:50%;position:absolute;left:var(--x);top:var(--y);width:22px;height:22px;padding:0;background:var(--accent);border:3px solid white;border-radius:50%;box-shadow:0 2px 12px rgba(0,0,0,.45),0 0 0 5px rgba(251,113,133,.19);cursor:pointer;transform:translate(-50%,-50%);transition:.15s}.hotspot::after{content:attr(data-label);position:absolute;left:27px;top:50%;padding:5px 8px;background:#10141a;color:white;border:1px solid rgba(255,255,255,.15);border-radius:5px;font-size:9px;font-weight:750;letter-spacing:.04em;white-space:nowrap;transform:translateY(-50%)}.hotspot.label-left::after{right:27px;left:auto}.labels-hidden .hotspot::after,.quiz-mode .hotspot::after{display:none}.quiz-mode .hotspot{width:32px;height:32px;background:transparent;border-color:transparent;box-shadow:none}.hotspot:hover,.hotspot:focus-visible,.hotspot.active{z-index:5;background:var(--cyan);outline:none;transform:translate(-50%,-50%) scale(1.25)}.hotspot.found{background:var(--correct);border-color:white}.hotspot.wrong{background:var(--accent);border-color:white}.hotspot.reveal{background:var(--cyan);border-color:white;box-shadow:0 0 0 9px rgba(103,232,249,.23)}.lesson-panel{padding:clamp(25px,4vw,48px);background:var(--surface)}.part-number,.quiz-count{margin:26px 0 7px;color:var(--accent);font:500 14px Georgia,serif}.lesson-panel h2{margin:0;font-size:clamp(32px,4vw,54px);font-weight:610;letter-spacing:-.055em}.part-description{min-height:64px;margin:16px 0 22px;color:#b9c0c9;font-size:14px;line-height:1.7}.fact{display:grid;gap:7px;padding:15px;background:var(--raised);border:1px solid var(--line);border-radius:8px}.fact span{color:var(--muted);font-size:9px;font-weight:750;letter-spacing:.13em;text-transform:uppercase}.fact strong{font-size:13px}.panel-actions{display:flex;gap:7px;margin-top:20px}.panel-actions button,.skip{height:40px;padding:0 15px;background:var(--raised);color:var(--text);border:1px solid var(--line);border-radius:7px;cursor:pointer}.panel-actions button:last-child{flex:1;background:var(--accent);color:#1e090e;border:0;font-weight:800}.parts-index{margin-top:38px;padding-top:25px;border-top:1px solid var(--line)}.parts-index>div{display:flex;flex-wrap:wrap;gap:6px;margin-top:13px}.parts-index button{padding:6px 9px;background:transparent;color:var(--muted);border:1px solid var(--line);border-radius:99px;font-size:9px;cursor:pointer}.parts-index button.active{color:var(--cyan);border-color:var(--cyan)}.feedback{min-height:40px;color:var(--muted);font-size:12px;line-height:1.5}.feedback.correct{color:var(--correct)}.feedback.wrong{color:var(--accent)}.skip{margin-top:10px}
@media(max-width:850px){.workspace{grid-template-columns:1fr}.guitar-stage{border-right:0;border-bottom:1px solid var(--line)}.guitar-stage>img{height:min(120vw,720px)}.page-heading{align-items:start;flex-direction:column}.lesson-panel{min-height:550px}}@media(max-width:520px){.site-header,.page-heading{padding-right:16px;padding-left:16px}.anatomy-shell{margin-right:16px;margin-left:16px}.mode-bar{flex-wrap:wrap}.progress{width:100%;margin-left:0}.guitar-stage>img{height:128vw}.hotspot::after{display:none}.lesson-panel{padding:25px 20px}}