.app-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: #132820;
  color: #fffaf0;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 24px 18px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  align-items: center;
  display: flex;
  gap: 12px;
}

.brand-mark {
  align-items: center;
  background: #d9ff67;
  color: #173126;
  display: inline-flex;
  font-weight: 900;
  height: 46px;
  justify-content: center;
  width: 46px;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: rgba(255, 250, 240, 0.65);
  margin-top: 3px;
}

.step-nav {
  display: grid;
  gap: 8px;
}

.sidebar-note {
  border-top: 1px solid rgba(255, 250, 240, 0.18);
  margin-top: auto;
  padding-top: 18px;
}

.sidebar-note span,
.sidebar-note strong {
  display: block;
}

.sidebar-note span {
  color: rgba(255, 250, 240, 0.58);
  font-size: 13px;
}

.sidebar-note strong {
  margin-top: 6px;
}

.workspace {
  min-width: 0;
  padding: 24px;
}

.topbar {
  align-items: flex-start;
  display: flex;
  gap: 20px;
  justify-content: space-between;
  margin-bottom: 18px;
}

.topbar h1 {
  font-size: 30px;
  line-height: 1.1;
  margin: 0;
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.status-strip {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 18px;
}

.content-stage {
  min-width: 0;
}

.panel {
  background: rgba(255, 253, 247, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.panel + .panel {
  margin-top: 16px;
}

.split-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
}

.route-split-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.65fr);
}

.metric-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    height: auto;
    position: static;
  }

  .step-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .status-strip,
  .metric-grid,
  .split-grid,
  .route-split-grid {
    grid-template-columns: 1fr;
  }
}