body {
  font-family: Georgia, serif;
  max-width: 740px;
  margin: 0 auto;
  padding: 40px 24px 0;
  background: #fff;
  color: #111;
  line-height: 1.7;
}

.back {
  display: inline-block;
  font-family: monospace;
  font-size: 0.85rem;
  color: #999;
  text-decoration: none;
  margin-bottom: 36px;
}

.back:hover { color: #111; }

.page-header {
  margin-bottom: 40px;
  border-bottom: 1px solid #eee;
  padding-bottom: 24px;
}

.week-label {
  font-family: monospace;
  font-size: 0.8rem;
  color: #aaa;
  margin-bottom: 6px;
}

h1 {
  font-size: 1.9rem;
  font-weight: normal;
  margin: 0 0 10px;
  line-height: 1.25;
}

.subtitle {
  font-size: 1rem;
  color: #666;
  font-style: italic;
  margin: 0;
}

h2 {
  font-size: 1.1rem;
  font-weight: bold;
  margin: 40px 0 10px;
}

h3 {
  font-size: 1rem;
  font-weight: bold;
  margin: 28px 0 8px;
}

p { margin: 0 0 16px; }

ul, ol {
  margin: 0 0 18px 22px;
  padding: 0;
}

li { margin-bottom: 8px; }

a { color: #111; }

.img-block {
  width: min(100%, 540px);
  margin: 28px auto;
}

.img-block img {
  width: 100%;
  display: block;
  background: #f5f5f5;
}

.img-block figcaption {
  font-size: 0.82rem;
  color: #888;
  margin-top: 6px;
  font-family: monospace;
}

.img-small {
  width: min(100%, 360px);
  margin-left: auto;
  margin-right: auto;
}

.img-small img {
  width: 100%;
}

.img-wide {
  width: min(100%, 620px);
  margin-left: auto;
  margin-right: auto;
}

.img-wide img {
  width: 100%;
  height: auto;
}

.img-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 28px 0;
}

.img-row figure { margin: 0; }

.img-row .media-stack {
  display: grid;
  gap: 12px;
}

.img-row .media-stack figure {
  margin: 0;
}

.img-row img {
  width: 100%;
  display: block;
  background: #f5f5f5;
}

.img-row video {
  width: 100%;
  display: block;
  background: #f5f5f5;
}

.img-row figcaption {
  font-size: 0.8rem;
  color: #888;
  margin-top: 5px;
  font-family: monospace;
}

.stl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 28px 0;
}

.stl-embed {
  margin: 0;
}

.stl-embed iframe {
  width: 100%;
  height: 260px;
  display: block;
  border: 0;
  background: #f5f5f5;
}

.stl-embed figcaption {
  font-size: 0.8rem;
  color: #888;
  margin-top: 5px;
  font-family: monospace;
}

.img-extra-wide {
  width: min(100vw - 48px, 1040px);
  margin-left: 50%;
  transform: translateX(-50%);
}

body.final-project .img-block {
  width: min(100%, 420px);
}

body.final-project .img-row {
  align-items: start;
}

body.final-project .data-table {
  table-layout: fixed;
}

body.final-project .data-table th:first-child,
body.final-project .data-table td:first-child {
  width: 36%;
}

@media (max-width: 640px) {
  body.final-project .img-row { grid-template-columns: 1fr; }
  .stl-grid { grid-template-columns: 1fr; }
}

pre {
  background: #eef7ff;
  border-left: 3px solid #8bc6ff;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.55;
  margin: 24px 0;
}

code {
  font-family: monospace;
  font-size: 0.88em;
  background: #f3f3f3;
  padding: 1px 4px;
  border-radius: 2px;
}

pre code {
  background: none;
  padding: 0;
}

.video-block {
  width: min(100%, 540px);
  margin: 28px auto;
}

.video-block video {
  width: 100%;
  display: block;
}

.video-small {
  width: min(100%, 360px);
  margin-left: auto;
  margin-right: auto;
}

.video-medium {
  width: min(100%, 540px);
  margin-left: auto;
  margin-right: auto;
}

.video-portrait {
  width: min(100%, 360px);
}

.video-portrait video {
  width: 100%;
  max-height: none;
  margin: 0 auto;
  object-fit: contain;
}

.video-embed {
  margin: 28px 0;
}

.video-embed iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  border: 0;
  background: #f5f5f5;
}

.video-block figcaption {
  font-size: 0.82rem;
  color: #888;
  margin-top: 6px;
  font-family: monospace;
}

.video-embed figcaption {
  font-size: 0.82rem;
  color: #888;
  margin-top: 6px;
  font-family: monospace;
}

.file-link {
  display: inline-block;
  font-family: monospace;
  font-size: 0.85rem;
  color: #555;
  text-decoration: none;
  border: 1px solid #ddd;
  padding: 4px 12px;
  border-radius: 3px;
  margin: 4px 0;
}

.file-link:hover {
  border-color: #111;
  color: #111;
}

.callout {
  border-left: 3px solid #8bc6ff;
  padding: 12px 18px;
  background: #eef7ff;
  margin: 28px 0;
  font-size: 0.95rem;
}

.equation-card {
  border-left: 3px solid #8bc6ff;
  background: #eef7ff;
  padding: 14px 18px;
  margin: 24px 0;
  overflow-x: auto;
}

.equation-card p {
  font-family: monospace;
  margin: 0;
  white-space: nowrap;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0 28px;
  font-size: 0.92rem;
}

.data-table caption {
  caption-side: bottom;
  font-family: monospace;
  font-size: 0.82rem;
  color: #888;
  text-align: left;
  margin-top: 6px;
}

.data-table th,
.data-table td {
  border-bottom: 1px solid #e5e5e5;
  padding: 8px 10px;
  text-align: left;
}

.data-table th {
  font-family: monospace;
  font-size: 0.82rem;
  color: #555;
  background: #f8f8f8;
}

.media-placeholder {
  border: 1px dashed #ccc;
  background: #f8f8f8;
  color: #777;
  font-family: monospace;
  font-size: 0.82rem;
  padding: 18px;
  margin: 24px 0;
}

.note {
  color: #666;
  font-style: italic;
}

footer {
  margin-top: 32px;
  margin-bottom: 0;
  border-top: 1px solid #eee;
  padding-top: 24px;
  padding-bottom: 16px;
  font-family: monospace;
  font-size: 0.82rem;
  color: #aaa;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

footer a { color: #aaa; }
footer a:hover { color: #111; }

@media (max-width: 500px) {
  .img-row { grid-template-columns: 1fr; }
  .img-extra-wide {
    width: 100%;
    margin-left: 0;
    transform: none;
  }
}