body {
  background-color: #f8f9fa;
}

/* Barra superior: usuario + cerrar sesión (admisión y admin) */
.app-shell-main {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-shrink: 0;
  padding: 0.7rem 1.35rem;
  background: linear-gradient(105deg, #ffffff 0%, #f8fafc 45%, #f1f5f9 100%);
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
  position: relative;
  z-index: 5;
}

.app-topbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(90deg, #238636 0%, #2ea043 35%, #1f6feb 100%);
  opacity: 0.85;
}

.app-topbar-start {
  min-width: 0;
  flex: 1;
}

.app-topbar-user {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #334155;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #e2e8f0;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}

.app-topbar-user i {
  font-size: 1.15rem;
  color: #475569;
}

.app-topbar-user-name {
  max-width: 14rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-app-logout {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.15rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  color: #7f1d1d;
  background: linear-gradient(180deg, #fff1f2 0%, #fecdd3 100%);
  border: 1px solid #f43f5e;
  box-shadow: 0 2px 10px rgba(244, 63, 94, 0.18);
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.btn-app-logout:hover {
  color: #450a0a;
  filter: brightness(1.02);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(244, 63, 94, 0.28);
}

.btn-app-logout:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.35);
}

.app-shell-body {
  flex: 1 1 auto;
  min-height: 0;
}

@media (max-width: 767.98px) {
  .app-topbar {
    flex-wrap: wrap;
    align-items: flex-start;
    padding: 0.65rem 0.9rem;
    gap: 0.6rem;
  }

  .app-topbar-user {
    max-width: 100%;
  }

  .app-topbar-user-name {
    max-width: 11.5rem;
  }

  .btn-app-logout {
    width: 100%;
    justify-content: center;
    padding: 0.52rem 0.9rem;
  }

  .app-shell-body {
    padding: 0.95rem !important;
  }

  .app-shell-body > .d-flex.justify-content-between.align-items-center.mb-4 {
    flex-wrap: wrap;
    align-items: stretch !important;
    gap: 0.65rem;
  }

  .app-shell-body > .d-flex.justify-content-between.align-items-center.mb-4 > .btn,
  .app-shell-body > .d-flex.justify-content-between.align-items-center.mb-4 > a.btn {
    width: 100%;
  }

  .table-responsive {
    -webkit-overflow-scrolling: touch;
  }

  .table-responsive table {
    min-width: 640px;
  }

  .modal-dialog {
    margin: 0.55rem;
  }

  .modal-content {
    border-radius: 12px;
  }

  .modal-footer {
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .modal-footer .btn {
    flex: 1 1 100%;
  }
}