:root{--font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;--very-light-blue: #e2eeff;--blue: #2563eb;--deep-blue: #1949cc;--black-blue: #202d4b}body{font-family:var(--font-sans);font-size:16px;max-width:840px;color:var(--black-blue);-webkit-user-select:none;user-select:none;background-color:var(--very-light-blue);line-height:2rem;margin:0 auto}.audio-btn{background-color:var(--blue);color:#fff;font-weight:700;border:none;border-radius:.5rem;padding:.5rem .75rem;cursor:pointer;gap:.5rem}.audio-btn:hover,.audio-btn.playing{background-color:var(--deep-blue)}.lesson{display:flex;flex-wrap:wrap;gap:0 1rem}.lesson-title{flex:0 0 auto;font-weight:1000;margin-bottom:1rem}.fa-headphones{margin-right:.5rem}footer{color:#888;text-align:center;font-size:1rem;margin-top:2rem}footer a{color:var(--blue);text-decoration:underline;font-weight:500}footer a:hover{color:var(--deep-blue);text-decoration:none}