.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

.app-sidebar {
  background: var(--navy-900);
  color: var(--white);
  display: flex;
  flex-direction: column;
  padding: var(--space-6) var(--space-4) 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.app-sidebar__brand {
  display: block;
  margin-bottom: var(--space-4);
}

.app-sidebar__brand img {
  display: block;
  width: 180px;
  max-width: 100%;
  height: auto;
}

.app-sidebar__title {
  font-weight: 600;
  font-size: 16px;
  margin: 0;
  color: var(--white);
}

.app-sidebar__subtitle {
  font-size: 12px;
  color: var(--white-a70);
  margin: 0 0 var(--space-6);
}

.app-sidebar__nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.app-sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-control);
  color: var(--white-a85);
  border-left: 3px solid transparent;
  transition: background var(--motion-fast);
}

.app-sidebar__link:hover {
  background: var(--white-a06);
  text-decoration: none;
}

.app-sidebar__link[aria-current='page'] {
  background: var(--sidebar-active);
  border-left-color: var(--blue-600);
  color: var(--white);
}

.app-sidebar__help {
  position: relative;
  z-index: 1;
  margin-top: auto;
  padding: var(--space-4) 0;
  font-size: 12px;
  color: var(--white-a75);
  border-top: 1px solid var(--white-a12);
}

.app-sidebar__car {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 240px;
  object-fit: cover;
  object-position: top;
  opacity: 0.7;
  mask-image: linear-gradient(180deg, transparent, black);
  -webkit-mask-image: linear-gradient(180deg, transparent, black);
  pointer-events: none;
}

.app-sidebar .app-sidebar__close {
  display: none;
}

.app-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.icon {
  color: inherit;
}

.app-content {
  flex: 1;
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6) var(--space-8);
}

.app-footer {
  background: var(--navy-900);
  color: var(--white-a80);
  padding: var(--space-8);
  font-size: 13px;
}

.app-footer a {
  color: var(--white);
}

.app-footer a:hover {
  color: var(--white-a80);
}

@media (max-width: 1279px) {
  .app-shell {
    grid-template-columns: var(--sidebar-width-compact) 1fr;
  }
}

@media (max-width: 1023px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .app-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-width);
    transform: translateX(-100%);
    transition: transform var(--motion-slow);
    z-index: 20;
  }
  .app-sidebar:not(.is-open) {
    visibility: hidden;
  }
  .app-sidebar.is-open {
    transform: translateX(0);
  }
  .app-sidebar .app-sidebar__close {
    display: inline-flex;
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    color: var(--white);
  }
  .app-sidebar__close:hover {
    background: var(--white-a12);
  }
  .app-sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--overlay-navy);
    z-index: 19;
  }
  .app-sidebar-backdrop.is-open {
    display: block;
  }
}

@media (max-width: 767px) {
  .app-content {
    padding: var(--space-4);
  }
}