@font-face {
font-family: 'my-alt-round-Medium';
src: url('https://geniusjamtracks.com/fonts/my-alt/my-alt-Medium.ttf') format('truetype');
font-display: swap;
}

body {
width: 100%;
max-width: 100vw;
overflow-x: clip;
font-family: SF Pro Display, SF Pro Icons, Helvetica Neue, Helvetica, Arial, sans-serif;
color: #111;
margin: 0;
padding: 0;
background: #fff;
}

.lesson__language-selector {
position: fixed;
top: 80px;
right: 20px;
z-index: 1000;
font-size: 14px;
margin: 6px;
backdrop-filter: blur(6px);
border-radius: 8px;
padding: 6px 10px;
}

.lesson__language-selector a {
margin-left: 8px;
text-decoration: none;
color: #333;
}
.lesson__language-selector a:hover {
text-decoration: underline;
}

.lesson__content-wrapper {
padding: 100px 20px;
max-width: 960px;
margin: 0 auto;
}

.lesson__label {
font-size: 24px;
color: #999;
margin-bottom: 4px;
font-family: 'my-alt-round-Medium', sans-serif;
letter-spacing: 0.5px;
}

.lesson__chapter {
font-size: 20px;
color: #999;
margin-bottom: 8px;
}

.lesson__title {
font-size: 48px;
margin-bottom: 40px;
font-family: 'my-alt-round-Medium', sans-serif;
}

.lesson__video-container {
position: relative;
padding-bottom: 56.25%;
height: 0;
margin-top: 42px;
margin-bottom: 72px;
border-radius: 12px;
overflow: hidden;
box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.lesson__video-container iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
border: none;
}

.lesson__text {
font-size: 16px;
color: #333;
line-height: 1.7;
}

.lesson__text h2 {
font-size: 32px;
margin-top: 60px;
margin-bottom: 24px;
font-family: 'my-alt-round-Medium', sans-serif;
color: #111;
}

.lesson__notation-box {
background: #f9f9f9;
border-left: 4px solid #eb870f;
padding: 16px;
margin: 24px 0;
font-family: monospace;
font-size: 15px;
line-height: 1.5;
overflow-x: auto;
}

.lesson__summary-box {
background: #fff7e6;
border-left: 4px solid #eb870f;
padding: 20px;
font-size: 16px;
margin-top: 48px;
border-radius: 6px;
color: #333;
}

.lesson__next-chapter {
margin-top: 64px;
padding-top: 32px;
border-top: 1px solid #eee;
text-align: right;
}

.lesson__next-link {
font-size: 16px;
font-weight: bold;
text-decoration: none;
color: #eb870f;
transition: color 0.2s ease;
}

.lesson__next-link:hover {
color: #c56900;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
.lesson__content-wrapper {
  padding: 60px 16px;
}

.lesson__label {
  font-size: 18px;
}

.lesson__chapter {
  font-size: 16px;
}

.lesson__language-selector {
  top: 62px;
  right: 12px;
  font-size: 13px;
}

.lesson__title {
  font-size: 32px;
  margin-bottom: 32px;
}

.lesson__text h2 {
  font-size: 24px;
  margin-top: 40px;
  margin-bottom: 20px;
}

.lesson__text {
  font-size: 15px;
}

.lesson__summary-box {
  font-size: 15px;
  margin-top: 36px;
}

.lesson__notation-box {
  font-size: 14px;
  padding: 12px;
}
}