html {
  height: 100%;
}
body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
}
:root, [data-bs-theme="light"] { --app-bg: #f4f6f9; }
[data-bs-theme="dark"] { --app-bg: #14171a; }
body { background-color: var(--app-bg); }

/* El contenido principal crece para empujar el footer al fondo */
.container-fluid.mt-4 {
  flex: 1 0 auto;
}

.card { border: none; box-shadow: 0 1px 4px rgba(0,0,0,0.08); border-radius: 10px; }
.navbar-brand { letter-spacing: 0.5px; }
.stat-card h2 { font-weight: 700; }
.table thead { background-color: var(--bs-tertiary-bg); }

footer {
  flex-shrink: 0;
  width: 100%;
}

.theme-toggle-btn {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 1050;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

.theme-toggle-btn-nav {
  border-radius: 50%;
  width: 34px;
  height: 34px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}