/*
Copyright (c) 2026 Alex Voss
SPDX-License-Identifier: MIT
Licensed under the MIT license. See LICENSE in the project root.
*/

/*
Slide layout:
- Scope presentation styles to slide pages; hide documentation controls there.
- Scale text with the smaller viewport dimension so short screens stay usable.
- Center content and navigation within an 80rem maximum width.
- Reserve up to 75dvh for slide content after allowing for page padding and
  navigation. Longer content and visible notes can grow and scroll normally.
- Use two equal grid columns, stacking them below 48rem in source order.
- Fit images within the available slide area without cropping or distortion.
- Hide notes until enabled; preserve their visibility and omit navigation when printing.
*/

/* Turn Zensical page elements off for slides. */
/* ------------------------------------------- */

body:has(.slide) {
  --slide-padding: clamp(1rem, 4vw, 4rem);
  --slide-available-height: calc(
    100dvh - var(--slide-padding) - var(--slide-padding) - 3rem
  );
}

body:has(.slide--autoplay) {
  --slide-available-height: calc(
    100dvh - var(--slide-padding) - var(--slide-padding) - 6rem
  );
}

body:has(.slide) .md-header,
body:has(.slide) .md-tabs,
body:has(.slide) .md-sidebar,
body:has(.slide) .md-footer,
body:has(.slide) .md-path,
body:has(.slide) .md-top {
  display: none;
}

/* Slide page layout */
/* ----------------- */

body:has(.slide) .md-main__inner {
  margin-block: 0;
  max-width: 100%;
}

body:has(.slide) .md-content {
  min-width: 0;
  width: 100%;
}

body:has(.slide) .md-content__inner {
  margin: 0;
  padding: var(--slide-padding);
  padding-block-end: 0;
}

.slide {
  max-width: 80rem;
  margin-inline: auto;
  font-size: clamp(1rem, min(2vw, 3vh), 2rem);
}

.slide__content {
  display: flow-root;
  min-height: min(75dvh, var(--slide-available-height));
  overflow-wrap: anywhere;
}

.slide--autoplay .slide__content {
  padding-block-start: 3rem;
}

/* Title slides */
/* ------------ */

.slide:has(.decksical-title-logo) .slide__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.slide:has(.decksical-title-logo) .slide__content > h1 {
  margin: 0;
}

.slide__content > p:has(> .decksical-title-logo) {
  margin: 0 0 2rem;
}

.slide img.decksical-title-logo {
  display: block;
  width: clamp(8rem, 20vw, 15rem);
  height: auto;
}

.decksical-title-tagline {
  max-width: 42ch;
  margin: 0.15em 0 0;
  text-align: center;
}

/* Format headings */
/* --------------- */

.slide__content > h1 {
  color: var(--md-default-fg-color);
  font-size: clamp(2rem, min(4vw, 6vh), 4rem);
}

.slide__content mjx-container[display="true"] {
  display: block;
  margin-block: clamp(1rem, 3vh, 1.5rem);
  font-size: clamp(1.5rem, min(3vw, 5vh), 3rem);
  text-align: center;
}

.slide .admonition {
  font-size: inherit;
  line-height: 1.2;
}

.slide .admonition > .admonition-title {
  padding-inline-start: calc(1em + 1.5rem);
}

.slide .admonition > .admonition-title::before {
  top: 50%;
  width: 1em;
  height: 1em;
  transform: translateY(-50%);
}

.slide .headerlink {
  display: none;
}

/* Full-size images */
/* ---------------- */

.slide img.slide-image {
  display: block;
  width: 100%;
  height: min(75dvh, var(--slide-available-height));
  object-fit: contain;
}

/* Two-column layouts */
/* ------------------ */

.slide__columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 3rem);
}

.slide__column {
  min-width: 0;
  display: flow-root;
}

.slide__column > :first-child {
  margin-block-start: 0;
}

.slide__column img {
  display: block;
  width: 100%;
  height: auto;
  max-height: min(75dvh, var(--slide-available-height));
  object-fit: contain;
}

@media (max-width: 48rem) {
  .slide__columns {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Speaker notes */
/* ------------- */

.slide__content > details.notes {
  margin-top: 3rem;
  font-size: 1rem;
}

.slide:not(.slide--notes-visible) details.notes {
  display: none;
}

/* Slide navigation */
.slide__footer {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: 10;
  padding: 0 var(--slide-padding) var(--slide-padding);
  pointer-events: none;
}

.slide__footer--hide-until-hover .slide__navigation {
  opacity: 0;
  transition: opacity 150ms ease;
}

.slide__footer--hide-until-hover .slide__navigation a {
  pointer-events: none;
}

.slide__footer--hide-until-hover .slide__navigation:hover,
.slide__footer--hide-until-hover .slide__navigation:focus-within {
  opacity: 1;
}

.slide__footer--hide-until-hover .slide__navigation:hover a,
.slide__footer--hide-until-hover .slide__navigation:focus-within a {
  pointer-events: auto;
}

@media (hover: none) {
  .slide__footer--hide-until-hover .slide__navigation {
    opacity: 1;
    transition: none;
  }

  .slide__footer--hide-until-hover .slide__navigation a {
    pointer-events: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .slide__footer--hide-until-hover .slide__navigation {
    transition: none;
  }
}

.slide__navigation {
  max-width: 80rem;
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  font-size: 1rem;
  pointer-events: auto;
}

.slide__navigation a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .75rem;
  border-radius: .25rem;
  background: color-mix(in srgb, var(--md-default-bg-color) 75%, transparent);
  color: var(--md-default-fg-color);
}

.slide__navigation a[rel="next"] {
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
}

.slide__navigation a[rel="prev"] {
  grid-column: 1;
  grid-row: 1;
  justify-self: start;
}

.slide__navigation .slide__overview {
  grid-column: 2;
  grid-row: 1;
}

.slide__navigation a:hover,
.slide__navigation a:focus-visible {
  background: var(--md-accent-fg-color--transparent);
}

.slide__navigation svg {
  width: 1.5rem;
  height: 1.5rem;
}

/* Automatic playback controls */
/* ---------------------------- */

.slide__playback-toggle {
  position: fixed;
  inset-block-start: 1rem;
  inset-inline-end: 1rem;
  z-index: 11;
  display: grid;
  width: 2.5rem;
  aspect-ratio: 1;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 0.25rem;
  background: color-mix(in srgb, var(--md-default-bg-color) 55%, transparent);
  color: var(--md-default-fg-color);
  cursor: pointer;
}

.slide__playback-toggle:hover,
.slide__playback-toggle:focus-visible {
  background: var(--md-accent-fg-color--transparent);
}

.slide__playback-toggle[hidden],
.slide__playback-toggle [hidden] {
  display: none;
}

.slide__playback-toggle svg {
  width: 1.5rem;
  height: 1.5rem;
}

/* Printing */
/* -------- */

@media print {
  .slide__content { min-height: 0; }
  .slide--autoplay .slide__content { padding-block-start: 0; }
  .slide__navigation { display: none; }
  .slide__playback-toggle { display: none; }

  .slide img.slide-image,
  .slide__column img {
    height: auto;
    max-height: none;
  }
}