/*
 * Shared course-document rendering.
 * Both the Tiptap admin canvas and the student lesson page use this stylesheet.
 */
.course-document {
  color: #344054;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  overflow-wrap: anywhere;
}

.course-document > * + * {
  margin-top: 0.9em;
}

.course-document p {
  margin-block: 0;
  min-height: 1.7em;
}

.course-document h1,
.course-document h2,
.course-document h3,
.course-document h4,
.course-document h5,
.course-document h6 {
  margin: 1.25em 0 0.45em;
  color: #101828;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.course-document h1 { font-size: 28px; }
.course-document h2 { font-size: 24px; }
.course-document h3 { font-size: 20px; }
.course-document h4 { font-size: 18px; }
.course-document h5,
.course-document h6 { font-size: 16px; }

.course-document strong { color: #172033; }
.course-document a:not(.course-document-file) { color: #3157d5; text-decoration: underline; text-underline-offset: 3px; }
.course-document mark { padding: 0.08em 0.2em; border-radius: 3px; }
.course-document code:not(pre code) { padding: 0.12em 0.35em; border-radius: 4px; background: #f2f4f7; color: #b42318; }

.course-document ul,
.course-document ol {
  padding-left: 1.55em;
}

.course-document li + li {
  margin-top: 0.35em;
}

.course-document blockquote {
  margin-inline: 0;
  padding: 12px 18px;
  border-left: 3px solid #4b6fff;
  border-radius: 0 8px 8px 0;
  background: #f5f7ff;
  color: #475467;
}

.course-document pre {
  overflow-x: auto;
  padding: 18px;
  border: 1px solid #e4e7ec;
  border-radius: 10px;
  background: #f2f4f7;
  color: #172033;
  line-height: 1.65;
}

.course-document hr {
  margin-block: 28px;
  border: 0;
  border-top: 1px solid #e4e7ec;
}

.course-document table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.course-document th,
.course-document td {
  min-width: 90px;
  padding: 10px 12px;
  border: 1px solid #d0d5dd;
  text-align: left;
  vertical-align: top;
}

.course-document th {
  background: #f8fafc;
  color: #172033;
  font-weight: 650;
}

.course-document img,
.course-document-video video {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin-inline: auto;
  border-radius: 12px;
}

.course-document-image,
.course-document-video {
  margin: 22px 0;
}

.course-document-image figcaption,
.course-document-video figcaption {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding-top: 10px;
  color: #667085;
  font-size: 14px;
  text-align: center;
}

.course-document-video {
  padding: 14px;
  border: 1px solid #e4e7ec;
  border-radius: 14px;
  background: #f8fafc;
}

.course-document-file {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  margin: 18px 0;
  padding: 14px 16px;
  border: 1px solid #d0d5dd;
  border-radius: 12px;
  background: #fff;
  color: #3157d5;
  text-decoration: none;
}

.course-document-file > span:nth-child(2) {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.course-document-file small {
  color: #667085;
}

.course-document-file-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 9px;
  background: #eef2ff;
  color: #3157d5;
  font-size: 11px;
  font-weight: 700;
}

.course-document .lesson-task-list {
  padding-left: 0;
  list-style: none;
}

.course-document .lesson-task-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

@media (max-width: 760px) {
  .course-document { font-size: 15px; }
  .course-document h1 { font-size: 26px; }
  .course-document h2 { font-size: 22px; }
  .course-document h3 { font-size: 19px; }
  .course-document-file { grid-template-columns: 42px minmax(0, 1fr); }
  .course-document-file > span:last-child { display: none; }
}