/**
 * Theme panel: the round button in the top right corner and the box it opens
 *
 * Built by theme-panel.js. The sizes are in rem, so the panel keeps its size when the text size option changes
 * only through the root font size, like the rest of the page.
 */
.panel {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  font-size: 0.875rem;
  font-weight: 400;
  text-align: left;
}

.panel-button {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  color: var(--text);
  background: var(--surface);
  border: 0.0625rem solid var(--border);
  border-radius: 9999px;
  box-shadow: 0 0.125rem 0.5rem rgba(0, 0, 0, 0.12);
  cursor: pointer;
}

.panel-button:hover,
.panel-button[aria-expanded="true"] {
  color: var(--primary);
  border-color: var(--primary);
}

/* The box has one column and, when the photo background has packs to show, a second one on its left (the box is
   anchored to the right edge). On a narrow screen the two columns stack and the box scrolls. */
.panel-box {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  display: flex;
  flex-direction: row-reverse;
  align-items: flex-start;
  gap: 0.5rem;
}

.panel-box[hidden] {
  display: none;
}

.panel-column {
  box-sizing: border-box;
  width: 18rem;
  max-width: calc(100vw - 2rem);
  max-height: calc(100vh - 5rem);
  padding: 1rem;
  overflow-y: auto;
  color: var(--text);
  background: var(--surface);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.18);
}

.panel-column[hidden] {
  display: none;
}

/* A group of options added later, which starts with its own title (the first title of a column has no margin) */
.panel-group {
  margin-top: 0.9rem;
}

@media (max-width: 40rem) {
  .panel-box {
    flex-direction: column;
    align-items: stretch;
    width: 18rem;
    max-width: calc(100vw - 2rem);
    max-height: calc(100vh - 5rem);
    overflow-y: auto;
  }

  .panel-column {
    width: auto;
    max-height: none;
    overflow-y: visible;
  }
}

.panel-title {
  margin: 0.9rem 0 0.4rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
}

.panel-title:first-child {
  margin-top: 0;
}

.panel-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.375rem;
}

.panel-options.two {
  grid-template-columns: repeat(2, 1fr);
}

.panel-options.four {
  grid-template-columns: repeat(4, 1fr);
}

.panel-option {
  padding: 0.4rem 0.5rem;
  font: inherit;
  font-size: 0.8125rem;
  color: var(--text);
  background: var(--surface-muted);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius-button);
  cursor: pointer;
}

.panel-option:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.panel-option[aria-checked="true"],
.panel-option[aria-pressed="true"] {
  color: var(--on-primary);
  background: var(--primary);
  border-color: transparent;
}

.panel-colors {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
}

.panel-color {
  position: relative;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 0;
  border-radius: 9999px;
  cursor: pointer;
}

.panel-color[aria-checked="true"],
.panel-radius[aria-checked="true"] {
  box-shadow:
    0 0 0 0.125rem var(--surface),
    0 0 0 0.25rem var(--primary);
}

.panel-color[aria-checked="true"]::after {
  content: "\2713";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--on-primary);
}

.panel-radii {
  display: flex;
  gap: 0.375rem;
}

.panel-radius {
  width: 1.75rem;
  height: 1.75rem;
  padding: 0;
  background: var(--surface-muted);
  border: 0.0625rem solid var(--border);
  cursor: pointer;
}

@media (forced-colors: active) {
  .panel-color {
    forced-color-adjust: none;
  }
}

/* The photo packs of the background option: a quiet sub-heading over each group */
.panel-pack {
  margin: 0.6rem 0 0.3rem;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
}