/* ========================================
   Teacher Dashboard Styles
   ======================================== */

/* Active session banner */
.active-session-card {
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  border: 1px solid rgba(79,70,229,0.3);
}
.active-session-info { flex: 1; min-width: 0; }
.active-session-info h3 { color: white; font-size: 1.1rem; margin-bottom: 4px; }
.active-session-info p { color: rgba(255,255,255,0.5); font-size: 13px; }
.active-session-qr { text-align: center; }
.active-session-qr canvas { border-radius: 8px; background: white; padding: 4px; }
.qr-expire-mini { font-size: 12px; font-weight: 700; color: rgba(255,255,255,0.6); margin-top: 4px; }
.active-session-stats { display: flex; gap: 20px; }
.as-stat { text-align: center; }
.as-val { font-size: 1.8rem; font-weight: 800; color: white; }
.as-lbl { font-size: 11px; color: rgba(255,255,255,0.4); }

/* QR Section Grid */
.qr-section-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 768px) { .qr-section-grid { grid-template-columns: 1fr; } }

/* QR Session Code */
.qr-session-code {
  display: inline-block;
  background: var(--dark);
  color: white;
  font-family: 'Courier New', monospace;
  font-size: 1.6rem;
  font-weight: 800;
  padding: 10px 24px;
  border-radius: var(--radius);
  letter-spacing: 6px;
  margin: 8px 0;
}

/* Session info rows */
.sinfo-row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
.sinfo-row:last-child { border-bottom: none; }
.sinfo-key { color: var(--gray); font-weight: 500; }
.sinfo-val { font-weight: 600; color: var(--text); text-align: right; }

/* Activity Feed */
.activity-item { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 13.5px; }
.activity-item:last-child { border-bottom: none; }
.activity-avatar { flex-shrink: 0; }
.activity-content { flex: 1; line-height: 1.5; color: var(--text); }
.activity-time { font-size: 11px; color: var(--gray); white-space: nowrap; }

/* Mini student rows */
.mini-student-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.mini-student-row:last-child { border-bottom: none; }

/* Grid 2 responsive */
@media (max-width: 768px) { .grid-2 { grid-template-columns: 1fr !important; } }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr !important; } }

/* Section animation */
.section.active { display: block; }
.section { display: none; }
.section.hidden { display: none; }