/* ═══════════════════════════════════════════════════════════════════════════
   IMAGE LIGHTBOX  ·  blog post images, opened full-screen and uncropped
   Pairs with assets/js/lightbox.js. Classes and tokens only, no inline styles.

   WHY THIS EXISTS. Blog figures are drawn inside a fixed frame: aspect-ratio
   4/3 (16/9 full-width) with object-fit:cover, plus a radial gradient that
   paints the page background over the photo from 40% radius outward. That is
   the magazine look and it stays. The cost is that part of every photo is
   cropped away or washed out, and on a phone there is no way to get at it.
   This is the escape hatch: tap the image, see the whole thing, zoom into it.

   The page frame is UNCHANGED by this file. The overlay is a separate element
   that renders the same source with object-fit:contain and no feather, so what
   opens is the real photo rather than a bigger copy of the crop.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── The affordance, on the page image ──────────────────────────────────────
   Scoped to the three blog figure classes on purpose. Author avatars, the
   brand lockup and share icons are images too and must never become zoomable.
   .blog-hero-figure is the legacy class still carried by 15 published posts. */
.blog-fig img.mk-zoomable,
.blog-embed img.mk-zoomable,
.blog-hero-figure img.mk-zoomable { cursor: zoom-in; }

/* .blog-fig and .blog-hero-figure already establish a containing block; the
   author-inserted .blog-embed does not, and the badge is positioned. */
.blog-embed { position: relative; }

.mk-zoom-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;                       /* above the ::after feather overlay */
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  background: rgba(6,7,10,.62);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  color: var(--mk-text-primary);
  cursor: zoom-in;
  opacity: .5;
  transition: opacity var(--mk-dur-fast) var(--mk-ease-out),
              background var(--mk-dur-fast) var(--mk-ease-out),
              color var(--mk-dur-fast) var(--mk-ease-out),
              transform var(--mk-dur-fast) var(--mk-ease-out);
}
.mk-zoom-badge svg { display: block; width: 15px; height: 15px; fill: currentColor; }
.mk-zoom-badge:hover {
  opacity: 1;
  background: var(--mk-gold-gradient);
  color: var(--mk-text-on-gold);
  transform: translateY(-1px);
}
.mk-zoom-badge:focus-visible {
  opacity: 1;
  outline: 2px solid var(--mk-gold-300);
  outline-offset: 2px;
}

/* A pointer device gets the badge on hover so it stays out of the layout.
   Touch has no hover, so there it is always visible or it is undiscoverable. */
@media (hover: hover) and (pointer: fine) {
  .mk-zoom-badge { opacity: 0; }
  figure:hover > .mk-zoom-badge { opacity: .85; }
  .mk-zoom-badge:focus-visible { opacity: 1; }
}

/* ── The overlay ───────────────────────────────────────────────────────────
   touch-action:none because the gestures below are ours: the browser's own
   pinch and double-tap zoom would fight the transform math in lightbox.js. */
.mk-lightbox {
  position: fixed;
  inset: 0;
  z-index: 10000;                   /* above the share menu, which sits at 9999 */
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6,7,10,.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  opacity: 0;
  touch-action: none;
  overscroll-behavior: contain;
  -webkit-user-select: none;
  user-select: none;
  transition: opacity var(--mk-dur-snap) var(--mk-ease-out);
}
.mk-lightbox[hidden] { display: none; }
.mk-lightbox.is-open { opacity: 1; }

.mk-lightbox__img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;              /* the WHOLE photo. no crop, no feather. */
  cursor: zoom-in;
  /* NO will-change:transform here. It promotes the image to a layer rastered
     once at its fit size, so zooming scales that raster instead of redrawing
     from the source: at 2.5x the type and grid turned to mush while the same
     render without it was sharp. One line, and it defeats the whole feature.
     Verified by A/B render, 2026-09-04. */
  -webkit-user-drag: none;
  -webkit-touch-callout: none;
}
.mk-lightbox.is-zoomed  .mk-lightbox__img { cursor: grab; }
.mk-lightbox.is-panning .mk-lightbox__img { cursor: grabbing; }

.mk-lightbox__close {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  background: rgba(6,7,10,.7);
  color: var(--mk-text-primary);
  cursor: pointer;
  transition: background var(--mk-dur-fast) var(--mk-ease-out),
              color var(--mk-dur-fast) var(--mk-ease-out),
              transform var(--mk-dur-fast) var(--mk-ease-out);
}
.mk-lightbox__close svg { display: block; width: 18px; height: 18px; fill: currentColor; }
.mk-lightbox__close:hover {
  background: var(--mk-gold-gradient);
  color: var(--mk-text-on-gold);
  transform: translateY(-1px);
}
.mk-lightbox__close:focus-visible {
  outline: 2px solid var(--mk-gold-300);
  outline-offset: 2px;
}

/* Scroll lock while the overlay owns the screen. */
html.mk-lightbox-lock,
html.mk-lightbox-lock body { overflow: hidden; }

@media (prefers-reduced-motion: reduce) {
  .mk-lightbox,
  .mk-lightbox__img,
  .mk-lightbox__close,
  .mk-zoom-badge { transition: none; }
}