.nav {
  margin-bottom: 0;
}

.container {
  max-width: 64rem;
}

.checker-card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  padding: 24px;
  margin-bottom: 24px;
  border: 1px solid #f3f4f6;
}

.checker-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #111827;
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.step-badge {
  background: #dbeafe;
  color: #1d4ed8;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}

.checker-intro {
  color: #4b5563;
  line-height: 1.6;
  margin: 0;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.capability-category {
  background: #f9fafb;
  border-radius: 8px;
  padding: 12px;
}

.capability-category h3 {
  font-size: 0.7rem;
  font-weight: 600;
  color: #374151;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 8px;
}

.capability-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 0.875rem;
}

.capability-item .name {
  color: #374151;
}

.supported {
  color: #10b981;
  font-weight: 500;
  font-size: 0.75rem;
}

.unsupported {
  color: #ef4444;
  font-weight: 500;
  font-size: 0.75rem;
}

.warning {
  color: #f59e0b;
  font-weight: 500;
  font-size: 0.75rem;
}

.hint-box {
  margin-top: 16px;
  padding: 12px;
  background: #f9fafb;
  border-radius: 8px;
  font-size: 0.75rem;
  color: #4b5563;
  line-height: 1.5;
}

.stream-input-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.stream-input-row input {
  flex: 1;
  min-width: 200px;
  padding: 10px 16px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.875rem;
}

.stream-input-row input:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-secondary {
  background: #7c3aed;
  color: #fff;
}

.btn-secondary:hover {
  background: #6d28d9;
}

.playback-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 1024px) {
  .playback-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.video-wrap {
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
}

.video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

.video-meta {
  margin-top: 8px;
  font-size: 0.75rem;
  color: #6b7280;
}

.video-meta .status-playing {
  color: #059669;
  font-weight: 600;
}

.video-meta .status-error {
  color: #dc2626;
  font-weight: 600;
}

.video-meta .status-warn {
  color: #d97706;
  font-weight: 500;
}

.video-meta .status-info {
  color: #2563eb;
  font-weight: 500;
}

.playback-log {
  background: #111827;
  color: #f3f4f6;
  border-radius: 8px;
  padding: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.75rem;
  height: 300px;
  overflow-y: auto;
  overflow-x: hidden;
  white-space: pre-wrap;
  word-break: break-all;
}

.playback-log .log-placeholder {
  color: #6b7280;
}

.log-entry {
  border-left: 3px solid #e5e7eb;
  padding-left: 12px;
  margin: 8px 0;
}

.playback-log .log-success {
  border-left-color: #10b981;
  background: rgba(16, 185, 129, 0.2);
  color: #10b981;
  padding: 8px 12px;
  border-radius: 4px;
}

.playback-log .log-error {
  border-left-color: #ef4444;
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
  padding: 8px 12px;
  border-radius: 4px;
}

.playback-log .log-warn {
  border-left-color: #f59e0b;
  background: rgba(245, 158, 11, 0.2);
  color: #f59e0b;
  padding: 8px 12px;
  border-radius: 4px;
}

.playback-log .log-info {
  border-left-color: #3b82f6;
  background: rgba(59, 130, 246, 0.2);
  color: #3b82f6;
  padding: 8px 12px;
  border-radius: 4px;
}

#streamAnalysis {
  font-size: 0.875rem;
  line-height: 1.6;
}

.analysis-success {
  color: #15803d;
}

.analysis-error {
  color: #b91c1c;
}

.analysis-warn {
  color: #b45309;
}

.analysis-info {
  color: #1d4ed8;
}

#diagnosisReport {
  font-size: 0.875rem;
  line-height: 1.6;
}

.diagnosis-success {
  padding: 16px;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  color: #166534;
}

.diagnosis-error {
  padding: 16px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  color: #991b1b;
}

.diagnosis-info {
  padding: 16px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  color: #1e3a8a;
}

.diagnosis-error ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

.diagnosis-error li {
  margin: 4px 0;
}