body{background:#faf9f6;color:#20252b}main{max-width:900px;margin:2rem auto;padding:0 1.4rem}
.lesson{line-height:1.72;font-size:17px}.lesson h1{font-size:2rem;line-height:1.25}.lesson h2{margin-top:2.2rem}
.lesson h3{margin-top:1.8rem}.notice{border-left:4px solid #8c6b28;padding:.6rem 1rem;background:#fff8e8}
.math-display{display:block;overflow-x:auto;max-width:100%;padding:.3rem 0}.math{overflow-wrap:normal}
nav.pager{display:flex;justify-content:space-between;gap:1rem;margin:2rem 0;flex-wrap:wrap}
img.course-figure{max-width:100%;height:auto}table{display:block;overflow:auto;max-width:100%}
a{overflow-wrap:anywhere}@media(max-width:500px){main{padding:0 1rem}.lesson{font-size:16px}.lesson h1{font-size:1.65rem}.ideal-diagram{font-size:75%}}