.app-shell {
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  height: 100vh;
  padding: var(--space-5) var(--space-4);
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
}

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

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 2.5rem;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-weight: var(--weight-medium);
  text-decoration: none;
}

.nav-link:hover {
  background: var(--color-surface-sunken);
  color: var(--color-text);
}

.nav-link.is-active {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: var(--weight-semibold);
}

.sidebar-footer {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.tenant-name {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: calc(var(--z-nav) - 1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 4rem;
  padding: var(--space-3) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(8px);
}

.topbar-context {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.topbar-tenant {
  overflow: hidden;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.main {
  width: 100%;
  max-width: 80rem;
  padding: var(--space-6);
  margin: 0 auto;
  scroll-margin-top: 5rem;
}

.page-header {
  margin-bottom: var(--space-6);
}

.page-header-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.page-heading {
  min-width: 0;
}

.page-title {
  margin-top: var(--space-1);
}

.page-description {
  max-width: 70ch;
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}

.page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.auth-layout {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: var(--space-6);
  background:
    radial-gradient(circle at top left, var(--color-primary-soft), transparent 45%),
    var(--color-bg);
}

.auth-card {
  width: min(100%, 26rem);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.auth-title {
  margin-bottom: var(--space-2);
}

.auth-description {
  margin-bottom: var(--space-6);
  color: var(--color-text-muted);
}

.btn.nav-toggle,
.btn.nav-close {
  display: none;
}

.shell-overlay {
  display: none;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(20rem, 86vw);
    visibility: hidden;
    transform: translateX(-100%);
    transition:
      transform var(--motion-base) ease,
      visibility 0s linear var(--motion-base);
  }

  .sidebar.is-open {
    visibility: visible;
    transform: translateX(0);
    transition-delay: 0s;
  }

  .btn.nav-toggle,
  .btn.nav-close {
    display: inline-flex;
  }

  .nav-toggle {
    flex: 0 0 auto;
  }

  body.nav-open {
    overflow: hidden;
  }

  .shell-overlay {
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-nav) - 2);
    display: block;
    background: rgb(0 0 0 / 0.4);
  }

  .topbar {
    padding-inline: var(--space-4);
  }

  .main {
    padding: var(--space-4);
  }
}

@media (max-width: 560px) {
  .page-header-row {
    flex-direction: column;
  }

  .page-actions {
    width: 100%;
  }

  .page-actions .btn {
    flex: 1 1 auto;
  }

  .user-name {
    display: none;
  }
}

.auth-body {
  background: var(--color-bg);
}

.internal-body {
  background:
    radial-gradient(circle at top left, var(--color-primary-soft), transparent 40%),
    var(--color-bg);
}

.internal-layout {
  width: min(100%, 72rem);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

.internal-hero {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.internal-brand {
  margin-bottom: var(--space-2);
}

.internal-title {
  margin: 0;
  font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
  letter-spacing: -0.03em;
}

.internal-description {
  max-width: 62ch;
  color: var(--color-text-muted);
}

.internal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: var(--space-4);
}

.internal-card {
  display: flex;
  flex-direction: column;
}

.internal-card-description {
  color: var(--color-text-muted);
}

.internal-card-meta {
  margin-bottom: var(--space-2);
}

.internal-card .card-footer {
  margin-top: auto;
}

@media (max-width: 560px) {
  .internal-layout {
    padding: var(--space-8) var(--space-4);
  }
}