/* ============================================================
   layout.css — app shell, sidebar, topbar, page content
   Web Oshkosh Aurora Design System — Dashboard Edition
   ============================================================ */

/* ------ App shell grid ------ */
.app-shell {
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: 1fr;
  min-height: 100vh;
}

/* ------ Sidebar ------ */
.sidebar {
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--border);
}

.sidebar-logo {
  padding: 1.25rem 1.125rem 1rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo h2 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.sidebar-logo h2 span {
  color: var(--accent);
}

.sidebar-logo p {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.sidebar-nav {
  flex: 1;
  padding: 0.75rem 0;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.625rem 1.125rem;
  color: var(--sidebar-text);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.sidebar-nav a:hover {
  background: var(--sidebar-hover);
  color: #dee1f7;
  text-decoration: none;
}

.sidebar-nav a.active {
  background: rgba(0, 209, 255, 0.08);
  color: var(--accent);
  border-left-color: var(--sidebar-active);
}

.sidebar-nav .nav-icon {
  display: none;
}

.sidebar-footer {
  padding: 0.875rem 1.125rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ------ Main area ------ */
.main-area {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow: hidden;
  background: var(--bg);
}

/* ------ Topbar ------ */
.topbar {
  background: rgba(14, 19, 34, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.topbar-right .user-email {
  display: none;
}

/* ------ Page content ------ */
.page-content {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.page-header h2 {
  font-size: 1.125rem;
  color: var(--text);
}

/* ------ Back link ------ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  text-decoration: none;
  transition: color 0.15s;
}

.back-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ------ Section title inside page ------ */
.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

/* ------ Mobile nav toggle ------ */
.nav-toggle {
  display: none;
  align-items: center;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.375rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
  margin-right: 0.625rem;
  flex-shrink: 0;
}

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 40;
}

.nav-overlay.open {
  display: block;
}

/* ------ Two-column page layout ------ */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
  align-items: start;
}

.page-layout-main { min-width: 0; }

.page-layout-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 1.5rem; /* matches page-content padding — sticks at grid top */
}

/* ------ Responsive: slide-in sidebar on small screens ------ */
@media (max-width: 768px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 220px;
    z-index: 50;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }

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

  .nav-toggle {
    display: flex;
  }

  .page-layout {
    grid-template-columns: 1fr;
  }

  .page-layout-sidebar {
    position: static;
  }

  /* Topbar fixed on mobile so hamburger is always reachable */
  .topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 45; /* below nav sidebar overlay (50), above content */
  }

  /* Compensate for topbar leaving flow */
  .main-area {
    padding-top: 52px;
  }
}