body, html {
    padding: 0;
    margin: 0;
}
* {
    box-sizing: border-box;
}
main {
    padding: 20px;
}
.columns {
    display: flex;
    gap: 20px;
}
nav {
    display: flex;
    gap: 10px;
}
nav.vertical {
    flex-direction: column;
    gap: 5px;
}
button {
    margin-top: 10px;
    border: 0;
    background-color: transparent;
    border-bottom: 2px solid #ccc;
    cursor: pointer;
}
button.no-line {
    border: 0;
}
nav.vertical button {
    border-right: 2px solid #ccc;
    border-bottom: 0;
}
button.active {
    border-color: #2150ac !important;
}
header {
    display: fixed;
    top: 0; 
    left: 0;
    right: 0;
    padding: 10px 20px;
    box-shadow: 0 0 10px black;
}
.modal-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  transition: opacity 0.5s ease-out;
}
.modal-bg.transparent {
    opacity: 0;
    pointer-events: none;
}

.modal {
  position: fixed;
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  max-width: 500px;
  width: 90%;
  position: relative;
  z-index: 1001;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.logo {
    font-weight: bold;
    text-shadow: 0 0 4px #2150ac;
}

footer {
    color: #888;
    display: fixed;
    left: 0;
    bottom: 0;
    right: 0;
    padding: 10px 20px;
}

footer ul {
    margin: 0;
}