.folder-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 24px;
}

.folder-link {
  --folder-width: 336px;
  position: relative;
  isolation: isolate;
  display: inline-block;
  inline-size: var(--folder-width);
  max-inline-size: 100%;
  aspect-ratio: 336 / 270;
  container-type: inline-size;
  vertical-align: top;
  appearance: none;
  box-sizing: border-box;
  padding: 0;
  border: 0;
  border-radius: 22px;
  background: none;
  cursor: pointer;
  color: white;
  font-family: var(--font-body);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  filter: drop-shadow(0 12px 18px rgb(30 79 137 / 9%));
}

.folder-link__back,
.folder-link__paper,
.folder-link__front {
  position: absolute;
  pointer-events: none;
}

.folder-link__back {
  inset: 0;
  background: url("/static/folder-back.svg") center / 100% 100% no-repeat;
}

.folder-link__paper {
  inset: 22.5% 7.2% 10%;
  border-radius: 11px 11px 5px 5px;
  background: linear-gradient(white 5%, #f7fbff 100%);
  box-shadow: 0 2px 5px rgb(20 90 175 / 8%);
  transition: transform 320ms cubic-bezier(0.22, 1, 0.36, 1);
}

.folder-link__front {
  inset: 30% 0 0;
  box-sizing: border-box;
  border: 1px solid rgb(162 201 255 / 90%);
  border-top-color: rgb(220 235 255 / 95%);
  border-bottom: 3px solid rgb(90 164 255 / 65%);
  border-radius: 22px;
  background: linear-gradient(
    180deg,
    rgb(203 226 255 / 76%) 0%,
    rgb(117 179 255 / 66%) 35%,
    rgb(78 156 255 / 63%) 66%,
    rgb(129 188 255 / 68%) 100%
  );
  -webkit-backdrop-filter: blur(7px);
  backdrop-filter: blur(7px);
  transition: border-color 220ms ease, box-shadow 220ms ease;
  box-shadow:
    inset 0 2px 2px rgb(255 255 255 / 42%),
    inset 9px 0 15px rgb(220 238 255 / 38%),
    inset -8px 0 13px rgb(179 215 255 / 38%),
    inset 0 -8px 12px rgb(202 229 255 / 46%);
}

.folder-link__label {
  position: absolute;
  inset-inline: 8%;
  top: 75%;
  transform: translateY(-50%);
  text-align: center;
  font-size: clamp(1rem, 10cqi, 2.125rem);
  font-weight: 400;
  line-height: 1.1;
  overflow-wrap: anywhere;
  text-wrap: balance;
  text-shadow: 0 1px 1px rgb(72 137 212 / 12%);
}

.folder-link[aria-disabled="true"] { cursor: default; }
/* Balance the empty folder against the paper-backed navigation folders. */
.folder-link[aria-disabled="true"] .folder-link__front { background-color: #e8f2ff; }
.folder-link .hover-hint { --hint-x: 0%; top: 100%; bottom: auto; left: auto; right: 0; margin: 8px 0 0; }
.folder-link:focus .hover-hint { opacity: 1; translate: 0 0; }

.folder-link:focus-visible {
  outline: 3px solid var(--theme-folder-focus);
  outline-offset: 6px;
}

.folder-link:focus-visible .folder-link__paper {
  transform: translateY(-12px);
}

@media (hover: hover) {
  .folder-link:hover .hover-hint { opacity: 1; translate: 0 0; transition-delay: 300ms; transition-duration: 150ms; }

  .folder-link:hover .folder-link__paper {
    transform: translateY(-12px);
  }

  .folder-link:hover .folder-link__front {
    border-top-color: white;
    box-shadow:
      inset 0 2px 3px rgb(255 255 255 / 70%),
      inset 9px 0 15px rgb(220 238 255 / 48%),
      inset -8px 0 13px rgb(179 215 255 / 48%),
      inset 0 -8px 12px rgb(202 229 255 / 56%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .folder-link .folder-link__paper,
  .folder-link:is(:hover, :focus-visible) .folder-link__paper {
    transform: none;
    transition: none;
  }

  .folder-link__front {
    transition: none;
  }
}