.app {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  height: 100vh;
}

.sidebar {
  background: #1f2937;
  color: #fff;
  overflow: visible;
  padding: 20px;
  position: relative;
  z-index: 850;
}

.sidebar-header {
  position: relative;
}

.sidebar-logo {
  background: #fff;
  border-radius: 6px;
  display: block;
  height: auto;
  margin-bottom: 12px;
  max-width: 220px;
  object-fit: contain;
  padding: 8px;
  width: 100%;
}

.sidebar-header p {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 24px;
}

.navigation-list,
.nav-submenu {
  list-style: none;
}

.navigation-list > li {
  margin-bottom: 16px;
  position: relative;
}

.nav-group-trigger {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 4px;
  color: #e5e7eb;
  cursor: pointer;
  display: flex;
  font: inherit;
  font-weight: 600;
  justify-content: space-between;
  min-height: 40px;
  padding: 8px;
  text-align: left;
  width: 100%;
}

.nav-group-trigger:focus-visible,
.nav-group-trigger:hover {
  background: #374151;
  color: #fff;
  outline: none;
}

.nav-group-trigger span {
  font-size: 22px;
}

.nav-submenu {
  background: #1f2937;
  border: 1px solid #4b5563;
  border-radius: 6px;
  box-shadow: 0 12px 24px rgb(17 24 39 / 30%);
  display: none;
  left: calc(100% + 20px);
  min-width: 220px;
  padding: 8px;
  position: absolute;
  top: 0;
  z-index: 1000;
}

.nav-group::after {
  content: "";
  height: 100%;
  left: 100%;
  position: absolute;
  top: 0;
  width: 20px;
}

.nav-group:hover > .nav-submenu,
.nav-group:focus-within > .nav-submenu,
.nav-group.expanded > .nav-submenu {
  display: block;
}

.nav-link {
  border-radius: 4px;
  color: #e5e7eb;
  display: block;
  min-height: 36px;
  padding: 8px;
  text-decoration: none;
}

.nav-link.active {
  background: #374151;
  color: #fff;
  font-weight: 700;
}

.nav-link.disabled {
  color: #d1d5db;
  cursor: not-allowed;
}

.main-content {
  min-width: 0;
  overflow: auto;
}

.topbar {
  align-items: center;
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: grid;
  gap: 20px;
  grid-template-columns: auto minmax(180px, 1fr) auto;
  padding: 20px;
}

.topbar h1 {
  font-size: 28px;
}

.topbar input {
  justify-self: center;
  max-width: 320px;
  width: 100%;
}

.open-menu-button,
.close-menu-button {
  display: none;
}

.navigation-backdrop {
  background: rgb(17 24 39 / 55%);
  inset: 0;
  position: fixed;
  z-index: 800;
}

/* Collapse the application shell on narrow screens and tablets. The 1200px
   width explicitly covers 1080px iPad landscape viewports even when Safari
   does not report the expected touch pointer/hover media features. */
@media (max-width: 1200px), (hover: none) and (pointer: coarse) {
  .app {
    display: block;
  }

  .sidebar {
    height: 100vh;
    left: 0;
    max-width: 320px;
    overflow-x: hidden;
    overflow-y: auto;
    position: fixed;
    top: 0;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    width: 85vw;
    z-index: 900;
  }

  .sidebar-logo {
    max-width: min(220px, calc(100% - 52px));
  }

  .nav-group::after {
    display: none;
  }

  .nav-submenu {
    border: 0;
    border-left: 1px solid #4b5563;
    border-radius: 0;
    box-shadow: none;
    left: auto;
    margin-left: 8px;
    min-width: 0;
    padding: 4px 0 4px 12px;
    position: static;
  }

  .nav-group:hover:not(.expanded) > .nav-submenu,
  .nav-group:focus-within:not(.expanded) > .nav-submenu {
    display: none;
  }

  .nav-group.expanded > .nav-submenu {
    display: block;
  }

  .nav-group.expanded .nav-group-trigger span {
    transform: rotate(90deg);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .open-menu-button,
  .close-menu-button {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    display: block;
    font-size: 20px;
    min-height: 44px;
    min-width: 44px;
  }

  .close-menu-button {
    border-color: #6b7280;
    color: #fff;
    position: absolute;
    right: 0;
    top: 0;
  }

  .topbar {
    grid-template-columns: auto 1fr auto;
  }

  .topbar input {
    grid-column: 1 / -1;
    grid-row: 2;
    max-width: none;
  }

  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .topbar {
    gap: 12px;
    padding: 16px;
  }

  .topbar h1 {
    font-size: 24px;
  }

  .user-menu {
    gap: 6px;
  }

  .user-menu span {
    max-width: 110px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .cards {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .panel {
    margin: 16px;
  }

  .toast-region {
    bottom: 16px;
    left: 16px;
    right: 16px;
  }

  .quick-actions-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .quick-actions {
    display: grid;
  }
}