body {
    background-image: url("./images/forest.jpg");
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* .bg-background-tertiary {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 20px;
} */

nav {
    width: calc(100vw * 0.618);      /* golden ratio width */
    margin: auto auto 0 auto;        /* center + space above */
    margin-top: calc(100vh * 0.382 * 0.618);
    padding: 16px 24px;              /* internal padding */
    background: rgba(255, 255, 255, 0.318);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.318);
}

.navbar-nav {
    margin-left: auto;
    margin-right: auto;
}

.child-navbar {
    --golden-margin: calc(100vh * 0.382 * 0.382 * 0.382);

    margin-top: var(--golden-margin);
    margin-bottom: var(--golden-margin);
}

.navbar-collapse {
    justify-content: center;
}

.card {
    margin: auto auto 0 auto;
    margin-bottom: calc(100vh * 0.618);
    aspect-ratio: 1.618 / 1;
    background: rgba(255, 255, 255, 0.318);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.318);
}

.child-card {
    width: calc(100vw * 0.618);
}

.card-body {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;

    flex-direction: column;
}

.separator {
    pointer-events: none;
    user-select: none;
    /* padding: 0 12px; */
    font-size: 1.2rem;
    opacity: 0.618;
    vertical-align: middle;
    line-height: 1.75;
    display: inline-block;
}

.card-title {
    text-align: center;
    /* margin-bottom: 0.5rem; */
}

.card-separator {
    width: 61.8%;
    /* margin: auto auto 1.618rem auto; centered line */
    border: none;
    border-top: 1px solid rgba(0,0,0,0.2);
}

.golden-btn {
    width: 61.8%;
    margin-left: auto;
    margin-right: auto;
  }