/*
 * Theme picker and theme-change animation, modelled on the theme switcher at
 * https://omarchy.org (its behaviour and look; this code is written for this site).
 *
 * The change runs inside document.startViewTransition(). The browser snapshots the
 * old page, the new theme is applied underneath, and a diagonal slit in the old
 * snapshot opens from the middle outwards until the new theme fills the screen.
 */

@property --theme-wipe {
  syntax: "<length-percentage>";
  inherits: false;
  initial-value: 0px;
}

@keyframes theme-split-wipe {
  from { --theme-wipe: 0px; }
  to   { --theme-wipe: 80%; }
}

::view-transition {
  pointer-events: none;
}

::view-transition-group(root),
::view-transition-image-pair(root),
::view-transition-group(theme-picker),
::view-transition-image-pair(theme-picker) {
  animation: none;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-new(root) {
  z-index: 0;
}

::view-transition-old(root) {
  z-index: 1;
}

::view-transition-group(theme-picker) {
  z-index: 2;
}

::view-transition-old(root),
::view-transition-old(theme-picker) {
  --slit: linear-gradient(
    100deg,
    #000 0,
    #000 calc(50% - var(--theme-wipe) + 1px),
    #0000 calc(50% - var(--theme-wipe) + 1px),
    #0000 calc(50% + var(--theme-wipe) - 1px),
    #000 calc(50% + var(--theme-wipe) - 1px),
    #000 100%
  );
  -webkit-mask-image: var(--slit);
  mask-image: var(--slit);
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  animation: theme-split-wipe 0.2s cubic-bezier(0.7, 0, 1, 1) both;
}

:root.theme-wipe-frosted::view-transition-old(root) {
  filter: blur(4px);
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root),
  ::view-transition-old(theme-picker) {
    animation: none;
  }
}

/* No CSS transitions while the colours swap, so nothing fades half-way. */
.no-transitions *,
.no-transitions *::before,
.no-transitions *::after {
  transition: none !important;
}

/* Material's own palette toggle stays in the page (it stores the choice) but is hidden. */
.md-header__option[data-md-component="palette"] {
  display: none;
}

/* ---------------------------------------------------------------- picker */

.tp-dimmer {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: rgb(0 0 0 / 0.55);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.tp-dialog {
  position: fixed;
  inset: 0;
  z-index: 11;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  outline: none;
  touch-action: none;
  view-transition-name: theme-picker;
  font-family: var(--md-text-font-family);
}

.tp-backdrop {
  position: absolute;
  inset: 0;
}

.tp-deck {
  position: relative;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.tp-slot,
.tp-spacer {
  width: min(72vw, 46rem);
}

.tp-slot {
  position: absolute;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.tp-spacer {
  visibility: hidden;
  aspect-ratio: 16 / 9;
}

.tp-card {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  pointer-events: auto;
  --card-dim: 0.55;
}

.tp-card:hover {
  --card-dim: 0.78;
}

/* Slanted frame: a 2.5% lean, the top edge shifted right of the bottom. */
.tp-frame {
  background: #71717a;
  clip-path: polygon(2.5% 0%, 100% 0%, 97.5% 100%, 0% 100%);
  box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.6);
}

.tp-front .tp-frame {
  background: var(--md-accent-fg-color);
}

.tp-inner {
  clip-path: polygon(calc(2.5% + 1px) 1px, calc(100% - 1px) 1px, calc(97.5% - 1px) calc(100% - 1px), 1px calc(100% - 1px));
  background: #000;
}

.tp-front .tp-inner {
  clip-path: polygon(calc(2.5% + 3px) 3px, calc(100% - 3px) 3px, calc(97.5% - 3px) calc(100% - 3px), 3px calc(100% - 3px));
}

.tp-slot:not(.tp-front) .tp-mock {
  filter: brightness(var(--card-dim));
}

.tp-name {
  position: relative;
  margin-top: 0.4rem;
  padding: 0.85rem 1rem;
  border: 0;
  background: none;
  cursor: pointer;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--md-default-fg-color);
  -webkit-text-stroke: 2px var(--md-default-bg-color);
  paint-order: stroke fill;
  transition: filter 0.15s ease-out;
}

.tp-name:hover {
  filter: brightness(1.25);
}

.tp-hint {
  position: relative;
  font-size: 0.7rem;
  color: rgb(255 255 255 / 0.7);
  letter-spacing: 0.02em;
}

.tp-arrow {
  position: absolute;
  top: 50%;
  display: flex;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  transform: translateY(-50%);
  border: 1px solid var(--md-default-fg-color--lightest);
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  cursor: pointer;
  transition: background-color 0.15s ease-out;
}

.tp-arrow:hover {
  background: var(--md-code-bg-color);
}

.tp-arrow svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

.tp-prev { left: 1.5rem; }
.tp-next { right: 1.5rem; }

@media (max-width: 600px) {
  .tp-slot, .tp-spacer { width: min(68vw, 46rem); }
  .tp-prev { left: 0.75rem; }
  .tp-next { right: 0.75rem; }
}

/* ------------------------------------------- miniature page in each card */

.tp-mock {
  display: flex;
  flex-direction: column;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  text-align: left;
}

.tp-mock__bar {
  display: flex;
  align-items: center;
  gap: 4%;
  height: 11%;
  padding: 0 5%;
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  font-size: clamp(0.5rem, 1.6vw, 0.9rem);
  font-weight: 700;
  white-space: nowrap;
}

.tp-mock__logo {
  width: 1.1em;
  height: 1.1em;
  border-radius: 0.2em;
  background: var(--md-accent-fg-color);
}

.tp-mock__search {
  margin-left: auto;
  width: 22%;
  height: 46%;
  border-radius: 0.2em;
  background: var(--md-default-fg-color--lightest);
}

.tp-mock__tabs {
  display: flex;
  gap: 3%;
  height: 6%;
  padding: 0 5%;
  align-items: center;
  background: var(--md-primary-fg-color);
}

.tp-mock__tabs span {
  width: 9%;
  height: 28%;
  border-radius: 1px;
  background: var(--md-primary-bg-color--light);
  opacity: 0.6;
}

.tp-mock__tabs span.on {
  background: var(--md-primary-bg-color);
  opacity: 1;
}

.tp-mock__body {
  display: flex;
  flex: 1;
  gap: 5%;
  padding: 4% 5%;
}

.tp-mock__nav {
  display: flex;
  flex-direction: column;
  gap: 7%;
  width: 20%;
}

.tp-mock__main {
  display: flex;
  flex-direction: column;
  gap: 5%;
  flex: 1;
}

.tp-line {
  height: 0.35rem;
  min-height: 3px;
  border-radius: 2px;
  background: var(--md-default-fg-color--lighter);
  opacity: 0.55;
}

.tp-line.accent {
  background: var(--md-accent-fg-color);
  opacity: 1;
}

.tp-title {
  font-size: clamp(0.65rem, 2.4vw, 1.4rem);
  font-weight: 300;
  line-height: 1.1;
  color: var(--md-default-fg-color);
}

.tp-code {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 3%;
  border-radius: 0.25rem;
  background: var(--md-code-bg-color);
}

.tp-code div {
  display: flex;
  gap: 2%;
}

.tp-code span {
  height: 0.32rem;
  min-height: 3px;
  border-radius: 2px;
}

.tp-code .kw { width: 14%; background: var(--md-code-hl-keyword-color); }
.tp-code .fn { width: 22%; background: var(--md-code-hl-function-color); }
.tp-code .st { width: 30%; background: var(--md-code-hl-string-color); }
.tp-code .nm { width: 10%; background: var(--md-code-hl-number-color); }
.tp-code .tx { width: 18%; background: var(--md-code-fg-color); opacity: 0.6; }

.tp-adm {
  padding: 2.5% 3%;
  border-left: 0.2rem solid var(--md-accent-fg-color);
  border-radius: 0.2rem;
  background: var(--md-accent-fg-color--transparent);
}

.tp-adm .tp-line {
  width: 70%;
}

.tp-btn {
  width: 22%;
  height: 0.9rem;
  border-radius: 0.2rem;
  background: var(--md-accent-fg-color);
}

/* uv Light only sets a few colours and relies on Material's light defaults, which a
   preview card inside a dark page would not inherit. Spell them out for the cards. */
.tp-frame[data-md-color-scheme="astral-light"],
.tp-name[data-md-color-scheme="astral-light"] {
  --md-default-bg-color: #fff;
  --md-default-fg-color: rgb(0 0 0 / 0.87);
  --md-default-fg-color--light: rgb(0 0 0 / 0.54);
  --md-default-fg-color--lighter: rgb(0 0 0 / 0.32);
  --md-default-fg-color--lightest: rgb(0 0 0 / 0.07);
  --md-primary-bg-color: #fff;
  --md-primary-bg-color--light: rgb(255 255 255 / 0.7);
  --md-code-bg-color: #f5f5f5;
  --md-code-fg-color: #36464e;
  --md-code-hl-keyword-color: #3f6ec6;
  --md-code-hl-function-color: #a846b9;
  --md-code-hl-string-color: #1c7d4d;
  --md-code-hl-number-color: #d52a2a;
  --md-accent-fg-color--transparent: rgb(222 95 233 / 0.1);
}

/* Header button that opens the picker */
.tp-open {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem;
  margin: 0 0.2rem;
  border: 0;
  background: none;
  color: currentColor;
  cursor: pointer;
}

.tp-open svg {
  width: 1.2rem;
  height: 1.2rem;
  fill: currentColor;
}