/* Lecture 2 uses the established reading layout with the course blue palette. */
:root { --accent:#0070c0; --ink:#202122; }
body {background:white;color:#202122;}
h1,h2,h3 {color:#0070c0;}
.callout {background:#f3f7fb;}
.l02-lab {border-top:2px solid #a4c6e2;margin:1.5em 0;padding:1em;background:#f5f8fb;}
.l02-lab summary {color:#0070c0;cursor:pointer;font-weight:600;}
.l02-lab iframe {display:block;border:0;width:100%;height:460px;margin-top:1em;}
@media print {.l02-lab {display:none;}}
@media(max-width:600px) {.l02-lab {padding:.5em;} .l02-lab iframe {height:600px;}}
.l02-comparison{padding:.65em;}
.l02-comparison summary{font-size:.95em;line-height:1.5;}
.l02-comparison iframe{height:440px;margin-top:.4em;}
.l02-slide-lab{padding:.6em;}
.l02-slide-lab .lab-instruction{font-size:.85em;margin:.4em 0;line-height:1.5;}
.l02-slide-lab iframe{width:100%;height:auto;aspect-ratio:16/9;margin-top:.5em;}

.l02-video{border-top:2px solid #a4c6e2;margin:1.5em 0;padding:1em;background:#f5f8fb}
.l02-video summary{color:#0070c0;cursor:pointer;font-weight:600}
.l02-video video{display:block;width:100%;max-width:680px;aspect-ratio:480/424;object-fit:contain;background:#101820;margin:1em auto}
.l02-video .source-note{font-size:.8em;line-height:1.6}
@media(max-width:600px){.l02-video{padding:.5em}}
@media print{.l02-video{display:none}}

/* One explicit learning point at the start of each instructional subsection. */
.l02-core{border-left:3px solid #0070c0;padding:.45em .85em;margin:.8em 0 1.1em;background:#f1f6fb;font-size:.95em;line-height:1.65}
.l02-core p{margin:0}
.l02-core strong{font-weight:600}