/* ============================================================
   shayvana — quiet chrome, shared by every page
   grid paper that fades toward the edges + the vertical spine
   (name, today's date, the moon, day/night).
   Load after colors.css.
   ============================================================ */

/* hobonichi grid, thinning out toward the edges of the page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: var(--g) var(--g);
  -webkit-mask-image: radial-gradient(ellipse 55% 60% at 50% 45%, #000 20%, transparent 90%);
          mask-image: radial-gradient(ellipse 55% 60% at 50% 45%, #000 20%, transparent 90%);
}

/* --- the spine --- */
.spine {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6rem;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 3rem 0;
  font-family: var(--serif);
  color: var(--soft);
}
.spine .v {
  writing-mode: vertical-rl;
  letter-spacing: .25em;
  font-size: .82rem;
  line-height: 1;
}
.spine a.v {
  color: var(--ink);
  font-size: .95rem;
  text-decoration: none;
}
.spine a.v:hover { color: var(--red); }
.spine .dow.sun { color: var(--red); }
.spine svg { width: 20px; height: 20px; display: block; }
.spine .moon-dark { fill: none; stroke: var(--line); }
.spine .moon-lit  { fill: var(--red); }
.spine button {
  font: inherit;
  font-size: .75rem;
  letter-spacing: .25em;
  writing-mode: vertical-rl;
  color: var(--soft);
  background: none;
  border: 0;
  padding: .25rem;
  cursor: pointer;
}
.spine button:hover { color: var(--ink); }
.spine :focus-visible { outline: 1px solid var(--red); outline-offset: 4px; }

@media (min-width: 821px) {
  body { padding-left: 6rem; }
}

/* on narrow screens the spine lies down along the top */
@media (max-width: 820px) {
  body { position: relative; padding-top: 3.25rem; }
  .spine {
    position: absolute;
    bottom: auto;
    right: 0;
    width: auto;
    height: 3.25rem;
    flex-direction: row;
    padding: 0 1.25rem;
    gap: 1rem;
  }
  .spine .v, .spine button { writing-mode: horizontal-tb; letter-spacing: .04em; }
  .spine .when { margin-left: auto; }
}

@media print {
  .spine, body::before { display: none; }
  body { padding: 0; }
}