.student-live-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: start;
}
.student-live-rail {
  position: sticky;
  top: 98px;
  display: grid;
  gap: 14px;
}
.task-timer {
  padding: 20px;
  border-radius: 16px;
  background: #17352c;
  color: white;
  text-align: center;
}
.task-timer span,
.task-timer small,
.task-timer strong {
  display: block;
}
.task-timer span {
  font-size: 10px;
  letter-spacing: 1.4px;
  font-weight: 850;
  color: #bfe2d4;
}
.task-timer strong {
  font-size: 40px;
  margin: 8px 0;
}
.task-timer small {
  color: #dbeae4;
}
.task-timer.expired {
  background: #96383c;
}
.submission-choice {
  display: flex;
  gap: 10px;
  margin: 14px 0;
}
.submission-choice label {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.submission-choice input {
  width: auto;
  margin: 0;
}
.submitted-document {
  overflow: hidden;
}
.submission-document-frame {
  width: 100%;
  height: 70vh;
  min-height: 520px;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.submission-document-image {
  display: block;
  max-width: 100%;
  max-height: 80vh;
  margin: 16px auto;
  border-radius: 8px;
}
.document-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
}
.document-heading span {
  display: block;
  color: var(--muted);
  font-size: 11px;
}
.document-heading a {
  display: inline-block;
  margin-left: 8px;
  color: var(--green);
}
@media (max-width: 900px) {
  .student-live-layout {
    grid-template-columns: 1fr;
  }
  .student-live-rail {
    position: static;
    grid-row: 1;
  }
  .submission-document-frame {
    height: 60vh;
    min-height: 400px;
  }
}
.teacher-assignment-tools {
  margin: 22px 0;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #f7faf8;
}
.visibility-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px;
}
.button-link {
  display: inline-block;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--green);
  text-decoration: none;
  background: #fff;
}
.mark-scheme-panel {
  margin: 18px 0;
  padding: 14px;
  border: 1px solid #b8d2c8;
  border-radius: 12px;
  background: #f2f8f5;
}
.mark-scheme-panel summary {
  cursor: pointer;
  font-weight: 800;
}
.review-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.65fr);
  gap: 18px;
  align-items: start;
}
.teacher-feedback-form {
  margin: 18px 0;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--pale);
}
.teacher-feedback-form h4 {
  margin-top: 0;
}
.feedback-score {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 9px;
  background: var(--green);
  color: #fff;
  font-size: 20px;
}
.teacher-feedback {
  border-left: 4px solid var(--green);
}
#autosave-status {
  display: block;
  margin-top: 7px;
  color: var(--muted);
}
@media (max-width: 900px) {
  .review-split {
    grid-template-columns: 1fr;
  }
}