/* Layout general */
#app {
  min-height: 100vh;
}

/* Navegación inferior */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
);
  width: 100%;
  max-width: 480px;
  background: var(--color-blanco);
  display: flex;
  justify-content: space-around;
  padding: var(--espacio-sm) 0;
  box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
  z-index: 100;
}

.nav-btn {
  background: transparent;
  color: #999;
  font-size: var(--texto-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--espacio-xs);
  border: none;
}

.nav-btn.active {
  color: var(--color-primario);
}

.nav-btn span {
  font-size: 20px;
}

/* Contenido principal */
.main-content {
  padding-bottom: 70px;
}

/* Header */
.app-header {
  background: var(--color-primario);
  color: var(--color-blanco);
  padding: var(--espacio-md);
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 50;
}

.app-header h1 {
  font-size: var(--texto-lg);
}