/*
 * PDF viewer (core), styles for the markup of CMS_Pdfviewer::render() and pdfviewer.js.
 *
 * Everything sits in a cascade layer: this file is loaded next to the viewer in the body,
 * so after the site's style.css. Unlayered rules always beat layered ones, which means a
 * site overrides any of this from its own stylesheet without !important or specificity
 * games. The custom properties on .pdfviewer are the intended knobs (see framework.md).
 */
@layer pdfviewer {
  .pdfviewer {
    --pdfv-bg: #f3f4f6;
    --pdfv-radius: 8px;
    --pdfv-gap: 12px;
    --pdfv-pad: 16px;
    --pdfv-page-height: clamp(280px, 80cqw, 560px);
    --pdfv-page-bg: #fff;
    --pdfv-page-shadow: 0 1px 4px rgba(0, 0, 0, .18);
    --pdfv-nav-size: 44px;
    --pdfv-nav-bg: #fff;
    --pdfv-nav-color: #333;
    /* an image arrow (url(...)) replaces the drawn chevron; set --pdfv-nav-chevron: none with it */
    --pdfv-nav-icon: none;
    --pdfv-nav-chevron: block;
    --pdfv-nav-inset: 10px;
    --pdfv-bar-color: #555;
    --pdfv-bar-font: inherit;
    --pdfv-bar-size: 14px;
    --pdfv-fs-bg: #1f2023;
    --pdfv-fs-color: #ddd;
    --pdfv-fs-page-height: calc(100vh - 90px);
    --pdfv-focus: #2563eb;
    --pdfv-z: 1000;

    /* the viewer is as wide as its column and never wider: inline-size containment keeps
       the pages in the track from stretching a flex/grid column, and cqw in the page height
       resolves against this box so the pages scale with the column */
    container-type: inline-size;
    display: block;
    position: relative;
    box-sizing: border-box;
    max-width: 100%;
    margin: 0 0 1.5em;
    padding: 12px 0 8px;
    background: var(--pdfv-bg);
    border-radius: var(--pdfv-radius);
    font: inherit;
  }

  @supports (height: 100dvh) {
    .pdfviewer {
      /* the iOS toolbar would otherwise cover the bottom of a fullscreen page */
      --pdfv-fs-page-height: calc(100dvh - 90px);
    }
  }

  .pdfviewer *,
  .pdfviewer *::before,
  .pdfviewer *::after {
    box-sizing: border-box;
  }

  /* without the script (or before it ran) only the link is useful */
  .pdfviewer:not([data-pdfviewer-init]) .pdfviewer__stage,
  .pdfviewer.is-error .pdfviewer__stage {
    display: none;
  }

  .pdfviewer[data-pdfviewer-init]:not(.is-error) .pdfviewer__fallback {
    display: none;
  }

  .pdfviewer__fallback {
    display: block;
    padding: 8px var(--pdfv-pad) 0;
  }

  .pdfviewer__stage {
    position: relative;
  }

  /* reserve the room the pages will take, so content below does not jump when pdf.js is done */
  .pdfviewer.is-loading:not(.pdfviewer--scroll) .pdfviewer__stage {
    min-height: calc(var(--pdfv-page-height) + 8px);
  }

  /* ---------- track and pages ---------- */

  .pdfviewer__track {
    display: flex;
    gap: var(--pdfv-gap);
    overflow-x: auto;
    padding: 4px var(--pdfv-pad);
    scroll-padding-inline: var(--pdfv-pad);
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    scrollbar-width: none;
    outline: none;
  }

  .pdfviewer__track::-webkit-scrollbar {
    display: none;
  }

  .pdfviewer__track:focus-visible {
    outline: 2px solid var(--pdfv-focus);
    outline-offset: -2px;
  }

  .pdfviewer__page {
    flex: 0 0 auto;
    position: relative;
    height: var(--pdfv-page-height);
    /* A4 portrait until pdf.js tells the real ratio */
    aspect-ratio: var(--pdfv-ar, 0.7071);
    background: var(--pdfv-page-bg);
    box-shadow: var(--pdfv-page-shadow);
    scroll-snap-align: start;
  }

  .pdfviewer__page canvas {
    display: block;
    width: 100%;
    height: 100%;
  }

  .pdfviewer__page.is-loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 28px;
    height: 28px;
    margin: -14px 0 0 -14px;
    border: 3px solid #ddd;
    border-top-color: #888;
    border-radius: 50%;
    animation: pdfviewer-spin .8s linear infinite;
  }

  @keyframes pdfviewer-spin {
    to {
      transform: rotate(360deg);
    }
  }

  /* single: one page at a time, letterboxed inside the stage */
  .pdfviewer--single .pdfviewer__track {
    padding-inline: 0;
    scroll-padding-inline: 0;
  }

  .pdfviewer--single .pdfviewer__page {
    flex: 0 0 100%;
    aspect-ratio: auto;
    background: transparent;
    box-shadow: none;
  }

  .pdfviewer--single .pdfviewer__page canvas {
    object-fit: contain;
    /* follows the drawn page instead of the letterboxed canvas box */
    filter: drop-shadow(0 1px 3px rgba(0, 0, 0, .25));
  }

  /* scroll: pages below each other at column width, the page itself scrolls */
  .pdfviewer--scroll .pdfviewer__track {
    flex-direction: column;
    overflow: visible;
    scroll-snap-type: none;
  }

  .pdfviewer--scroll .pdfviewer__page {
    flex: none;
    width: 100%;
    height: auto;
    scroll-snap-align: none;
  }

  /* cover: only the start page as a thumbnail with an open button */
  .pdfviewer--cover .pdfviewer__track {
    justify-content: center;
    overflow: hidden;
  }

  .pdfviewer--cover .pdfviewer__page {
    cursor: pointer;
  }

  .pdfviewer__open {
    position: absolute;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    z-index: 2;
    padding: 10px 18px;
    border: 0;
    border-radius: 999px;
    background: var(--pdfv-nav-bg);
    color: var(--pdfv-nav-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, .25);
    font: inherit;
    cursor: pointer;
  }

  /* ---------- previous / next ---------- */

  .pdfviewer__nav {
    position: absolute;
    top: 50%;
    z-index: 2;
    display: none;
    width: var(--pdfv-nav-size);
    height: var(--pdfv-nav-size);
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: var(--pdfv-nav-bg) var(--pdfv-nav-icon) no-repeat center / 55% auto;
    color: var(--pdfv-nav-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, .25);
    /* no text inside: the accessible name is the aria-label, and the arrow is
       drawn (no image, so no img-src needed under CSP). A text glyph would show
       next to the chevron as soon as a site styles buttons outside the layer. */
    cursor: pointer;
    transition: opacity .2s;
    transform: translateY(-50%);
  }

  .pdfviewer__nav::before {
    content: "";
    display: var(--pdfv-nav-chevron);
    position: absolute;
    inset: 0;
    width: 28%;
    height: 28%;
    margin: auto;
    border: solid currentColor;
    border-width: 0 3px 3px 0;
    transform: translateX(-15%) rotate(-45deg);
  }

  .pdfviewer__nav--prev {
    left: var(--pdfv-nav-inset);
    /* one arrow image for both directions */
    transform: translateY(-50%) scaleX(-1);
  }

  .pdfviewer__nav--next {
    right: var(--pdfv-nav-inset);
  }

  .pdfviewer__nav[disabled] {
    opacity: 0;
    pointer-events: none;
  }

  /* carousel: touch swipes, so the arrows only show for a mouse; single shows them always */
  @media (hover: hover) and (pointer: fine) {
    .pdfviewer--carousel .pdfviewer__nav {
      display: block;
    }
  }

  .pdfviewer--single .pdfviewer__nav {
    display: block;
  }

  /* ---------- bar ---------- */

  .pdfviewer__bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px 12px;
    padding: 8px var(--pdfv-pad) 0;
    color: var(--pdfv-bar-color);
    font-family: var(--pdfv-bar-font);
    font-size: var(--pdfv-bar-size);
  }

  .pdfviewer__title {
    flex: 1 1 auto;
    min-width: 0;
    font-weight: 600;
  }

  .pdfviewer__download {
    color: inherit;
  }

  .pdfviewer__fullscreen {
    padding: 4px 6px;
    border: 0;
    border-radius: 4px;
    background: transparent;
    color: inherit;
    font: inherit;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
  }

  .pdfviewer__fullscreen:hover {
    background: rgba(0, 0, 0, .08);
  }

  /* four corner brackets, drawn with gradients in currentColor: no glyph, no image */
  .pdfviewer__fsicon {
    display: block;
    width: 1em;
    height: 1em;
    --c: linear-gradient(currentColor, currentColor);
    background:
      var(--c) 0 0 / 40% 2px,   var(--c) 0 0 / 2px 40%,
      var(--c) 100% 0 / 40% 2px, var(--c) 100% 0 / 2px 40%,
      var(--c) 0 100% / 40% 2px, var(--c) 0 100% / 2px 40%,
      var(--c) 100% 100% / 40% 2px, var(--c) 100% 100% / 2px 40%;
    background-repeat: no-repeat;
  }

  .pdfviewer__nav:focus-visible,
  .pdfviewer__open:focus-visible,
  .pdfviewer__fullscreen:focus-visible,
  .pdfviewer__download:focus-visible,
  .pdfviewer__fallback:focus-visible {
    outline: 2px solid var(--pdfv-focus);
    outline-offset: 2px;
  }

  .pdfviewer__error {
    color: #b00020;
  }

  /* ---------- fullscreen (real API and the pseudo one for iPhone Safari) ---------- */

  .pdfviewer.is-fullscreen {
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin: 0;
    max-width: none;
    background: var(--pdfv-fs-bg);
    border-radius: 0;
  }

  .pdfviewer.is-fullscreen:not(:fullscreen) {
    position: fixed;
    inset: 0;
    z-index: var(--pdfv-z);
  }

  .pdfviewer.is-fullscreen:not(.pdfviewer--scroll) .pdfviewer__page {
    height: var(--pdfv-fs-page-height);
  }

  /* in scroll mode the fullscreen box itself scrolls through the pages */
  .pdfviewer--scroll.is-fullscreen {
    justify-content: flex-start;
    overflow-y: auto;
  }

  .pdfviewer.is-fullscreen .pdfviewer__bar {
    color: var(--pdfv-fs-color);
  }

  .pdfviewer.is-fullscreen .pdfviewer__fullscreen:hover {
    background: rgba(255, 255, 255, .12);
  }

  .pdfviewer.is-fullscreen .pdfviewer__nav {
    display: block;
  }

  /* ---------- preferences and print ---------- */

  @media (prefers-reduced-motion: reduce) {
    .pdfviewer__track {
      scroll-behavior: auto;
    }

    .pdfviewer__nav {
      transition: none;
    }

    .pdfviewer__page.is-loading::after {
      animation-duration: 3s;
    }
  }

  @media print {
    .pdfviewer {
      background: none;
      padding: 0;
    }

    .pdfviewer .pdfviewer__stage,
    .pdfviewer .pdfviewer__nav,
    .pdfviewer .pdfviewer__info,
    .pdfviewer .pdfviewer__download,
    .pdfviewer .pdfviewer__fullscreen {
      display: none;
    }

    .pdfviewer[data-pdfviewer-init]:not(.is-error) .pdfviewer__fallback {
      display: block;
    }
  }
}