.learning-topic-trigger {
  width: 100%;
  min-height: 42px;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-shrink: 0;
  border-color: rgba(70, 179, 236, 0.8);
  background: rgba(18, 49, 68, 0.94);
  color: #dff5ff;
  font-weight: 800;
}

.learning-topic-trigger:hover {
  background: #050607;
  color: #58c7ff;
}

.learning-topic-trigger.hidden,
.learning-topic-modal.hidden,
.learning-topic-image-modal.hidden {
  display: none;
}

body.learning-topic-open { overflow: hidden; }

.learning-topic-modal,
.learning-topic-image-modal {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(12px, 3vw, 34px);
}

.learning-topic-image-modal { z-index: 1020; }

.learning-topic-backdrop,
.learning-topic-image-backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 0;
  background: rgba(0, 0, 0, 0.84);
  backdrop-filter: blur(7px);
}

.learning-topic-image-backdrop { background: rgba(0, 0, 0, 0.95); }

.learning-topic-dialog {
  position: relative;
  width: min(1240px, 100%);
  max-height: min(92vh, 920px);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid rgba(70, 179, 236, 0.62);
  border-radius: 8px;
  background: #0c1219;
  box-shadow: 0 26px 90px rgba(0, 0, 0, 0.72);
}

.learning-topic-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 22px;
  border-bottom: 1px solid #334052;
  background: #101924;
}

.learning-topic-eyebrow {
  display: block;
  margin-bottom: 6px;
  color: #58c7ff;
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.learning-topic-header h2 {
  margin: 0;
  color: #f5f7fb;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.05;
  letter-spacing: 0;
  text-transform: none;
}

.learning-topic-close {
  flex: 0 0 auto;
  width: 42px;
  min-width: 42px;
  height: 42px;
  border: 1px solid rgba(142, 216, 255, 0.7);
  border-radius: 7px;
  background: #1c2531;
  color: #f5f7fb;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
}

.learning-topic-body {
  min-height: 0;
  overflow-y: auto;
  padding: clamp(16px, 2.5vw, 28px);
}

.learning-topic-layout {
  display: grid;
  grid-template-columns: minmax(190px, 0.58fr) minmax(480px, 1.65fr);
  gap: clamp(20px, 3vw, 38px);
  align-items: start;
}

.learning-topic-media {
  position: sticky;
  top: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(70, 179, 236, 0.36);
  border-radius: 7px;
  background: #050607;
}

.learning-topic-media-expand {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  background: #000;
  cursor: zoom-in;
}

.learning-topic-media img {
  display: block;
  width: 100%;
  max-height: 46vh;
  object-fit: contain;
  background: #000;
}

.learning-topic-media-expand span {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 7px 9px;
  border: 1px solid rgba(142, 216, 255, 0.62);
  border-radius: 5px;
  background: rgba(5, 10, 15, 0.88);
  color: #dff5ff;
  font-size: 12px;
  font-weight: 800;
}

.learning-topic-media figcaption {
  padding: 10px 12px;
  color: #aeb7c8;
  font-size: 12px;
  line-height: 1.4;
}

.learning-topic-content,
.learning-topic-sections { display: grid; }
.learning-topic-content { gap: 18px; }
.learning-topic-sections { gap: 10px; }

.learning-topic-lead {
  margin: 0;
  padding: 16px 18px;
  border-left: 4px solid #58c7ff;
  background: rgba(34, 70, 94, 0.35);
  color: #edf7ff;
  font-size: 18px;
  line-height: 1.5;
}

.learning-topic-lead > span {
  display: block;
  margin-bottom: 7px;
  color: #8ed8ff;
  font-size: 17px;
  font-weight: 800;
}

.learning-topic-section {
  padding: 14px 16px;
  border: 1px solid #334052;
  border-radius: 7px;
  background: #121922;
}

.learning-topic-section-featured {
  border-color: rgba(70, 179, 236, 0.56);
  background: #102131;
}

.learning-topic-section h3 {
  margin: 0 0 7px;
  color: #8ed8ff;
  font-size: 17px;
}

.learning-topic-section p,
.learning-topic-section li {
  color: #d8dee9;
  font-size: 16px;
  line-height: 1.6;
}

.learning-topic-section p,
.learning-topic-section ul { margin: 0; }
.learning-topic-section ul { display: grid; gap: 7px; padding-left: 20px; }

.learning-topic-callout {
  padding: 15px 17px;
  border: 1px solid rgba(255, 193, 7, 0.48);
  border-radius: 7px;
  background: rgba(76, 61, 12, 0.3);
  color: #f4e5ad;
  font-size: 16px;
  line-height: 1.6;
}

.learning-topic-references {
  padding: 12px 14px;
  border: 1px solid #334052;
  border-radius: 7px;
  background: #0f141b;
}

.learning-topic-references summary { cursor: pointer; color: #f5f7fb; font-weight: 800; }
.learning-topic-references ol { display: grid; gap: 9px; margin: 12px 0 0; padding-left: 20px; }
.learning-topic-references li,
.learning-topic-references a { color: #aeb7c8; font-size: 12px; line-height: 1.45; }
.learning-topic-references a:hover { color: #8ed8ff; }
.learning-topic-content code { padding: 1px 4px; border-radius: 3px; background: #06090d; color: #b9e8ff; }

.learning-topic-loading,
.learning-topic-error {
  min-height: 240px;
  display: grid;
  place-items: center;
  color: #aeb7c8;
  text-align: center;
}
.learning-topic-error { color: #f5b0b0; }

.learning-topic-image-dialog {
  position: relative;
  z-index: 1;
  width: min(1500px, 96vw);
  max-height: 94vh;
  margin: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  overflow: hidden;
  border: 1px solid rgba(70, 179, 236, 0.58);
  border-radius: 8px;
  background: #030507;
}

.learning-topic-image-full {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 86vh;
  object-fit: contain;
}

.learning-topic-image-dialog figcaption { padding: 10px 14px; color: #aeb7c8; font-size: 13px; text-align: center; }
.learning-topic-image-close { position: absolute; z-index: 2; top: 12px; right: 12px; }
.learning-topic-image-brand { position: absolute; z-index: 2; left: 50%; bottom: 48px; width: min(260px, 28vw); height: auto; transform: translateX(-50%); opacity: .88; filter: drop-shadow(0 2px 8px rgba(0, 0, 0, .75)); pointer-events: none; }
.learning-topic-image-count { position: absolute; z-index: 2; top: 14px; left: 16px; padding: 6px 9px; border-radius: 999px; background: rgba(8, 17, 26, .88); color: #edf4fb; font-size: 12px; font-weight: 800; }
.learning-topic-image-nav { position: absolute; z-index: 2; top: 50%; width: 48px; height: 58px; margin-top: -29px; padding: 0; border: 1px solid #34475d; border-radius: 8px; background: rgba(8, 17, 26, .9); color: #dcecff; font-size: 34px; cursor: pointer; }
.learning-topic-image-prev { left: 14px; }
.learning-topic-image-next { right: 14px; }

@media (max-width: 760px) {
  .learning-topic-layout { grid-template-columns: 1fr; }
  .learning-topic-media { position: static; }
  .learning-topic-media img { max-height: 42vh; }
  .learning-topic-header { padding: 16px; }
}