.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header"
    "main"
    "nav";
}

.app-header {
  grid-area: header;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  gap: var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
}

.brand-badge {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--violet-600);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
}

.header-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

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

.app-footer {
  grid-area: footer;
}

.app-sidebar {
  display: none;
}

.app-bottom-nav {
  grid-area: nav;
  position: sticky;
  bottom: 0;
  background: #fff;
  border-top: 1px solid var(--border);
  z-index: 10;
}

.bottom-nav-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
  padding: var(--space-2) var(--space-2) var(--space-3);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  color: var(--text-light);
  padding: 6px 4px;
  border-radius: var(--radius-md);
}

.nav-item svg {
  width: 20px;
  height: 20px;
}

.nav-item.active {
  color: var(--violet-600);
  background: var(--violet-50);
}

.page-container {
  max-width: 980px;
  margin: 0 auto;
}

.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

@media (min-width: 960px) {
  .app-shell {
    grid-template-columns: 260px 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "sidebar header"
      "sidebar main";
  }

  .app-sidebar {
    grid-area: sidebar;
    display: block;
    background: #0F172A;
    color: #E2E8F0;
    padding: var(--space-6) var(--space-4);
  }

  .app-bottom-nav {
    display: none;
  }

  .app-header {
    border-bottom: 1px solid var(--border);
  }

  .app-main {
    padding: var(--space-6);
  }
}