/* ============ LEFT NAVIGATION ============ */
.app-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 60px);
}
.left-nav {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 12px 8px;
  overflow-y: auto;
  height: calc(100vh - 60px);
  position: sticky;
  top: 60px;
}
.left-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 90;
  display: none;
}
.lnav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 12px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
  font-family: inherit;
  margin-bottom: 2px;
}
.lnav-item:hover {
  background: var(--surface-alt);
  color: var(--text);
}
.lnav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
}
.lnav-item.active .lnav-icon {
  color: var(--primary);
}
.lnav-icon {
  flex-shrink: 0;
  color: var(--text-muted);
}
.lnav-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.lnav-badge {
  background: var(--danger);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 9px;
  min-width: 18px;
  text-align: center;
}
.lnav-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 4px;
}
.app-main {
  min-width: 0;
  overflow-x: hidden;
}
.hamburger-btn {
  background: transparent;
  border: none;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  display: none;
  margin-right: 4px;
}
.hamburger-btn:hover {
  background: var(--surface-alt);
  color: var(--text);
}

@media (max-width: 900px) {
  .app-layout { grid-template-columns: 1fr; }
  .hamburger-btn { display: inline-flex; align-items: center; }
  .left-nav {
    position: fixed;
    top: 60px;
    left: 0;
    height: calc(100vh - 60px);
    width: 260px;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.25s ease-out;
    box-shadow: 4px 0 12px rgba(0,0,0,0.1);
  }
  .left-nav.open {
    transform: translateX(0);
  }
  .left-nav-backdrop.open {
    display: block;
  }
}