/*
 * Self-contained: no app's class names, no app's variables. Colour comes in through `--dtp-*`
 * custom properties, each with a fallback that works on a dark surface out of the box, so a
 * host can theme the picker by setting four values and nothing else.
 *
 * `--dtp-ease` and `--dtp-duration` are the same idea for motion: a host that turns transitions
 * off sets the duration to `0s` rather than reaching in here.
 */

datetime-picker {
  --dtp-bg: var(--dtp-surface, #161616);
  --dtp-fg: #fcfcfc;
  --dtp-muted: #8a8a8a;
  --dtp-line: #242424;
  --dtp-duration: 140ms;
  --dtp-ease: cubic-bezier(0.22, 1, 0.36, 1);

  display: block;
  width: 100%;
  color: var(--dtp-fg);
}

datetime-picker .dtp {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

datetime-picker .dtp-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

datetime-picker .dtp-zoom {
  flex: 1;
  padding: 0.35rem 0.6rem;
  border: 0;
  border-radius: 0.6rem;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--dtp-duration) var(--dtp-ease);
}

datetime-picker .dtp-zoom:hover:not(:disabled) {
  background: color-mix(in srgb, currentColor, transparent 90%);
}

datetime-picker .dtp-zoom:disabled {
  cursor: default;
}

datetime-picker .dtp-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: 999px;
  background: color-mix(in srgb, currentColor, transparent 92%);
  color: inherit;
  font: inherit;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition:
    background-color var(--dtp-duration) var(--dtp-ease),
    transform var(--dtp-duration) var(--dtp-ease);
}

datetime-picker .dtp-step:hover {
  background: color-mix(in srgb, currentColor, transparent 84%);
}

datetime-picker .dtp-step:active {
  transform: scale(0.92);
}

datetime-picker .dtp-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

datetime-picker .dtp-weekdays span {
  padding-bottom: 0.15rem;
  color: var(--dtp-muted);
  font-size: 0.75rem;
  text-align: center;
}

datetime-picker .dtp-grid {
  display: grid;
  gap: 2px;
}

datetime-picker .dtp-grid[zoom='day'] {
  grid-template-columns: repeat(7, 1fr);
}

/* Three across at the wider zooms, which is what the arrow-key maths assumes. */
datetime-picker .dtp-grid[zoom='month'],
datetime-picker .dtp-grid[zoom='year'] {
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
}

datetime-picker .dtp-cell {
  padding: 0;
  border: 0;
  border-radius: 0.6rem;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  transition:
    background-color var(--dtp-duration) var(--dtp-ease),
    color var(--dtp-duration) var(--dtp-ease),
    transform var(--dtp-duration) var(--dtp-ease);
}

datetime-picker .dtp-grid[zoom='day'] .dtp-cell {
  aspect-ratio: 1;
}

datetime-picker .dtp-grid[zoom='month'] .dtp-cell,
datetime-picker .dtp-grid[zoom='year'] .dtp-cell {
  padding: 0.75rem 0;
}

datetime-picker .dtp-cell:hover {
  background: color-mix(in srgb, currentColor, transparent 90%);
}

datetime-picker .dtp-cell:active {
  transform: scale(0.94);
}

/* Cells spilling in from the neighbouring page stay reachable, just quiet. */
datetime-picker .dtp-cell[outside='true'] {
  color: color-mix(in srgb, var(--dtp-muted), transparent 40%);
}

datetime-picker .dtp-cell[current='true'] {
  box-shadow: inset 0 0 0 1px var(--dtp-line);
}

datetime-picker .dtp-cell[aria-selected='true'] {
  background: var(--dtp-fg);
  color: var(--dtp-bg);
}

datetime-picker .dtp-cell:focus-visible,
datetime-picker .dtp-zoom:focus-visible,
datetime-picker .dtp-step:focus-visible,
datetime-picker .dtp-button:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 1px;
}

datetime-picker .dtp-time {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
}

datetime-picker .dtp-field {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.35rem;
}

datetime-picker .dtp-field > span {
  color: var(--dtp-muted);
  font-size: 0.85rem;
}

datetime-picker .dtp-control {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--dtp-line);
  border-radius: 0.75rem;
  background: color-mix(in srgb, currentColor, transparent 94%);
  color: inherit;
  font: inherit;
  box-sizing: border-box;
  transition:
    border-color var(--dtp-duration) var(--dtp-ease),
    background-color var(--dtp-duration) var(--dtp-ease);
}

datetime-picker .dtp-control:hover {
  border-color: color-mix(in srgb, currentColor, transparent 70%);
}

datetime-picker .dtp-control:focus-visible {
  border-color: currentColor;
  outline: none;
}

datetime-picker .dtp-control::-webkit-calendar-picker-indicator {
  filter: invert(1);
  opacity: 0.6;
  cursor: pointer;
}

datetime-picker .dtp-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

datetime-picker .dtp-button {
  padding: 0.7rem 1.2rem;
  border: 0;
  border-radius: 999px;
  background: var(--dtp-fg);
  color: var(--dtp-bg);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  transition:
    filter var(--dtp-duration) var(--dtp-ease),
    background-color var(--dtp-duration) var(--dtp-ease),
    transform var(--dtp-duration) var(--dtp-ease);
}

datetime-picker .dtp-button[ghost] {
  background: color-mix(in srgb, currentColor, transparent 90%);
  color: inherit;
}

datetime-picker .dtp-button:hover {
  filter: brightness(1.08);
}

datetime-picker .dtp-button[ghost]:hover {
  background: color-mix(in srgb, currentColor, transparent 82%);
}

datetime-picker .dtp-button:active,
datetime-picker .dtp-cell:active {
  transform: scale(0.96);
}

/* The platform's own answer always wins over the host's preference. */
@media (prefers-reduced-motion: reduce) {
  datetime-picker * {
    transition-duration: 0s !important;
  }
}