:root{--background:#f6f4ef;--card:#fff;--text:#222;--muted:#666;--accent:#356f9d;--accent-hover:#2a5b82;--border:#ddd;--shadow:0 8px 22px #00000014}*{box-sizing:border-box}body{background:var(--background);color:var(--text);margin:0;font-family:Inter,system-ui,sans-serif;line-height:1.6}#app{max-width:900px;margin:auto;padding:50px 25px 100px}h1{margin-bottom:.25rem;font-size:2.7rem}h2{margin-top:60px;margin-bottom:5px;font-size:1.8rem}h3{margin-top:0;margin-bottom:.5rem}.artist-description{color:var(--muted);margin-bottom:30px}.lesson-card{background:var(--card);box-shadow:var(--shadow);border-radius:18px;margin-bottom:28px;padding:26px;transition:transform .15s,box-shadow .15s}.lesson-card:hover{transform:translateY(-2px);box-shadow:0 12px 28px #0000001f}.lesson-links{flex-wrap:wrap;gap:20px;margin-top:18px;margin-bottom:18px;display:flex}.lesson-links a{color:var(--accent);font-weight:600;text-decoration:none}.lesson-links a:hover{text-decoration:underline}.lesson-status{color:var(--muted);min-height:1.4rem;margin-bottom:15px}button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:12px 20px;font-size:1rem;font-weight:600;transition:background .2s,transform .15s}button:hover{background:var(--accent-hover)}button:active{transform:scale(.98)}button:disabled{opacity:.5;cursor:wait}.settings-container{box-shadow:var(--shadow);background:#fff;border-radius:18px;margin:35px 0 50px;padding:20px}.settings-panel{margin-top:20px}.settings-panel label{margin-bottom:6px;font-weight:600;display:block}.settings-panel select{border:1px solid var(--border);border-radius:8px;width:220px;margin-bottom:18px;padding:10px;font-size:1rem}.artist{margin-bottom:70px}@media (width<=700px){#app{padding:25px 15px 70px}h1{font-size:2rem}.lesson-links{flex-direction:column;gap:10px}.settings-panel select{width:100%}}