.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  padding: 12px;
  border-bottom: 1px solid var(--border-dark);
  background: rgba(11, 19, 38, .95);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, .2);
  backdrop-filter: blur(12px);
}

.header-inner,
.app-main,
.sticky-footer-inner {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-xl);
  background: var(--slate-800);
  color: var(--slate-300);
  font-size: 12px;
  font-weight: 700;
  line-height: 1rem;
  text-decoration: none;
  transition: background .15s, border-color .15s, color .15s, transform .1s;
}

.back-link:hover {
  border-color: rgba(34, 211, 238, .5);
  background: rgba(6, 182, 212, .1);
  color: var(--accent-cyan);
}

.back-link:active {
  transform: scale(.97);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(59, 130, 246, .4);
  border-radius: 8px;
  background: rgba(37, 99, 235, .2);
  color: #60a5fa;
  font-size: 16px;
  font-weight: 700;
  box-shadow: 0 4px 6px -1px rgba(59, 130, 246, .1);
}

.brand h1 {
  color: var(--white);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.25;
}

.brand p {
  color: var(--slate-400);
  font-size: 10px;
  line-height: 1.5;
}

.app-main {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 12px;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  padding: 4px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-xl);
  background: var(--card-dark);
  font-size: 12px;
  font-weight: 700;
}

.tab {
  padding: 10px 8px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--slate-400);
  line-height: 1rem;
  text-align: center;
  transition: color .15s, background .15s, border-color .15s;
}

.tab:hover {
  color: var(--white);
}

.tab.active {
  border-color: rgba(6, 182, 212, .4);
  background: rgba(6, 182, 212, .2);
  color: var(--accent-cyan);
}

.tab-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-2xl);
  background: var(--card-dark);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, .35);
}

.monitor-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-dark);
  font-size: 12px;
  line-height: 1rem;
}

.monitor-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-green);
  font-size: 12px;
  font-weight: 700;
  line-height: 1rem;
  letter-spacing: .05em;
}

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse 2s cubic-bezier(.4, 0, .6, 1) infinite;
}

.monitor-actions,
.monitor-footer-actions,
.preview-footer-group,
.checklist-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.monitor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.monitor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px;
  border: 1px solid rgba(30, 41, 59, .6);
  border-radius: var(--radius-xl);
  background: rgba(15, 23, 42, .5);
}