body {
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: 0.5px;
}

.card {
  border: none;
  border-radius: 0.6rem;
}

.table thead th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: #6c757d;
}

.badge {
  text-transform: capitalize;
}

footer {
  padding: 1.5rem 0;
  color: #6c757d;
  font-size: 0.875rem;
  text-align: center;
}

/* ---------- App shell: top nav + sidebar layout ---------- */

:root {
  --topnav-height: 60px;
  --sidebar-width: 260px;
  --sidebar-bg: #16202f;
  --sidebar-bg-hover: #202c3e;
  --sidebar-active: #2563eb;
  --sidebar-text: #aab6c6;
  --sidebar-text-muted: #64748b;
}

.topnav {
  height: var(--topnav-height);
  position: sticky;
  top: 0;
  z-index: 1040;
}

.sidebar-toggle-btn {
  border: none;
  background: transparent;
  color: #fff;
  font-size: 1.4rem;
  line-height: 1;
  padding: 0.25rem 0.5rem;
}

.app-shell {
  display: flex;
  align-items: flex-start;
  min-height: calc(100vh - var(--topnav-height));
}

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--sidebar-bg);
  min-height: calc(100vh - var(--topnav-height));
  padding: 1.25rem 0.75rem 2rem;
  position: sticky;
  top: var(--topnav-height);
  align-self: flex-start;
  max-height: calc(100vh - var(--topnav-height));
  overflow-y: auto;
}

.sidebar .nav-section-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.07em;
  color: var(--sidebar-text-muted);
  padding: 0.9rem 0.9rem 0.35rem;
}

.sidebar .nav-link {
  color: var(--sidebar-text);
  border-radius: 0.5rem;
  padding: 0.6rem 0.9rem;
  margin-bottom: 0.15rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.925rem;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar .nav-link i {
  font-size: 1.05rem;
  width: 1.2rem;
  text-align: center;
  flex-shrink: 0;
}

.sidebar .nav-link:hover {
  background: var(--sidebar-bg-hover);
  color: #fff;
}

.sidebar .nav-link.active {
  background: var(--sidebar-active);
  color: #fff;
  font-weight: 500;
}

.sidebar .nav-link .badge {
  margin-left: auto;
}

.app-main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 1.75rem;
}

.sidebar-backdrop {
  display: none;
}

@media (max-width: 991.98px) {
  .sidebar {
    position: fixed;
    left: -100%;
    top: var(--topnav-height);
    height: calc(100vh - var(--topnav-height));
    z-index: 1045;
    transition: left 0.2s ease;
    box-shadow: 0.5rem 0 1.5rem rgba(0, 0, 0, 0.25);
  }

  .sidebar.show {
    left: 0;
  }

  .sidebar-backdrop.show {
    display: block;
    position: fixed;
    inset: var(--topnav-height) 0 0 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1042;
  }

  .app-main {
    padding: 1.25rem;
  }
}

@media (min-width: 992px) {
  .sidebar-toggle-btn {
    display: none;
  }
}