body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  background-color: #fcfcfc;
}

h1, h2, h3, h4, h5, h6 {
  color: #111;
  margin-top: 1.5em;
}

.os-figure, figure {
  margin: 2rem 0;
  text-align: center;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.os-caption-container {
  display: block;
  font-size: 0.9em;
  color: #666;
  margin-top: 0.5rem;
}

.os-title-label, .os-number {
  font-weight: bold;
}

.os-table table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.os-table th, .os-table td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: left;
}

.os-table th {
  background-color: #f5f5f5;
}

[data-type="term"] {
  font-weight: bold;
  color: #0056b3;
}

dt {
  font-weight: bold;
}

.learning-objectives {
  background: #eef7ff;
  padding: 1.5rem;
  border-left: 4px solid #0056b3;
  margin-bottom: 2rem;
}

.os-note-body {
  background: #fff3cd;
  padding: 1.5rem;
  border-left: 4px solid #ffc107;
  margin: 1.5rem 0;
}

/* Bilingual Presentation Utilities */
.eng.hidden {
  display: none !important;
}

.vn.visible {
  display: block !important;
}

/* Maintain inline display for span/strong inside texts */
span.vn.visible, strong.vn.visible, em.vn.visible, a.vn.visible {
  display: inline !important;
}