/* Certificate previews: list thumbnails (components/hub/CoaPreview.jsx) and the in-page
   viewer (components/hub/CoaViewer.jsx). Linked by CertificateList (components/hub/parts.jsx);
   scoped to .pt-root and its tokens (public/hub/pt.css). */

/* ---------- In a certificate row (public/hub/site.css .hub-cert) ---------- */
.pt-root .hub-cert.has-coa { padding-block: 8px; }
.pt-root .hub-cert > .coa-preview { justify-self: end; }
@media (max-width: 720px) {
  /* Phones: the thumbnail sits at the right of both rows, the test checks wrap beside it. */
  .pt-root .hub-cert.has-coa .hub-cert-tests { grid-column: 1; }
  .pt-root .hub-cert.has-coa > .coa-preview { grid-column: 2; grid-row: 1 / span 2; align-self: center; }
}

/* ---------- Thumbnail: a fixed 54 x 70 frame, so loading never moves the row ---------- */
.pt-root .coa-preview { position: relative; box-sizing: border-box; flex: none; width: 54px; height: 70px; border-radius: 7px; }
.pt-root .coa-thumb {
  display: block; overflow: hidden; text-decoration: none; cursor: zoom-in;
  /* A blank page with faint lines until the rendering arrives. */
  background:
    repeating-linear-gradient(to bottom, transparent 0 7px, #e4e8f0 7px 9px) 8px 16px / 38px 44px no-repeat,
    linear-gradient(#dfe4ee, #dfe4ee) 8px 8px / 24px 4px no-repeat,
    #ffffff;
  box-shadow: 0 0 0 1px var(--line), 0 8px 18px -12px rgba(0, 0, 0, 0.75);
  transition: transform .15s ease, box-shadow .15s ease;
}
.pt-root .coa-thumb img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top center; }
.pt-root .coa-thumb:hover { transform: translateY(-1px); box-shadow: 0 0 0 1px var(--brand), 0 10px 22px -12px rgba(0, 0, 0, 0.8); }
.pt-root .coa-thumb:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.pt-root .coa-thumb-tag {
  position: absolute; left: 3px; bottom: 3px; padding: 1px 4px; border-radius: 4px;
  font: 700 9px/12px var(--font-mono); letter-spacing: 0.04em; text-transform: uppercase;
  background: rgba(9, 12, 19, 0.84); color: #eef1f8;
}
.pt-root .coa-thumb-zoom {
  position: absolute; inset: 0; display: grid; place-items: center; color: #ffffff;
  background: rgba(9, 12, 19, 0.42); opacity: 0; transition: opacity .15s ease;
}
.pt-root .coa-thumb:hover .coa-thumb-zoom, .pt-root .coa-thumb:focus-visible .coa-thumb-zoom { opacity: 1; }
@media (hover: none) { .pt-root .coa-thumb-zoom { display: none; } }

/* The plain link when there is no preview (or it failed): a file icon in the same frame. */
.pt-root .coa-file {
  display: grid; place-items: center; align-content: center; gap: 4px; text-decoration: none;
  border: 1px dashed var(--line-strong); color: var(--ink-muted); background: transparent;
}
.pt-root .coa-file:hover { color: var(--link); border-color: var(--link); }
.pt-root .coa-file:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.pt-root .coa-file-label { display: inline-flex; align-items: center; gap: 1px; font: 700 10px/12px var(--font-mono); letter-spacing: 0.04em; text-transform: uppercase; }

/* ---------- Viewer: a modal on wide screens, a full-screen sheet on phones ---------- */
.pt-root .coa-viewer {
  box-sizing: border-box; width: min(980px, calc(100vw - 48px)); height: min(1120px, calc(100vh - 48px)); height: min(1120px, calc(100dvh - 48px));
  max-width: none; max-height: none; margin: auto; padding: 0; overflow: hidden;
  border: 1px solid var(--glass-rim); border-radius: var(--radius-lg);
  background: var(--surface-200); color: var(--ink); box-shadow: var(--shadow-float);
  font-family: var(--font-sans); overscroll-behavior: contain;
}
.pt-root .coa-viewer::backdrop { background: rgba(4, 6, 12, 0.74); -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px); }
.pt-root .coa-viewer[open] { animation: coa-in .18s ease-out; }
@keyframes coa-in { from { opacity: 0; transform: translateY(8px) scale(.985); } to { opacity: 1; transform: none; } }

.pt-root .coa-viewer-frame {
  display: grid; height: 100%; min-height: 0;
  grid-template-columns: minmax(0, 1fr) auto auto;
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas: "head tools close" "body body body";
  align-items: center;
}
.pt-root .coa-viewer-head { grid-area: head; min-width: 0; padding: 14px 8px 12px 20px; }
.pt-root .coa-viewer-eyebrow { margin: 0 0 2px; font: 600 11px/14px var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-subtle); }
.pt-root .coa-viewer-title { margin: 0; font: 650 17px/22px var(--font-sans); letter-spacing: -0.01em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pt-root .coa-viewer-meta { margin: 2px 0 0; font: 400 13px/18px var(--font-sans); color: var(--ink-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.pt-root .coa-viewer-tools { grid-area: tools; display: flex; align-items: center; gap: 8px; padding: 0 4px; }
.pt-root .coa-viewer-group { display: inline-flex; align-items: center; gap: 2px; padding: 2px; border-radius: var(--radius-sm); background: var(--surface-300); }
.pt-root .coa-viewer-btn {
  display: inline-grid; place-items: center; box-sizing: border-box; min-width: 36px; height: 36px; padding: 0 8px; margin: 0;
  border: 0; border-radius: 8px; background: transparent; color: var(--ink); font: 600 13px/1 var(--font-sans); cursor: pointer;
}
.pt-root .coa-viewer-btn:hover:not(:disabled) { background: var(--surface-200); }
.pt-root .coa-viewer-btn:disabled { color: var(--ink-subtle); opacity: .45; cursor: default; }
.pt-root .coa-viewer-btn:focus-visible, .pt-root .coa-viewer-original:focus-visible, .pt-root .coa-viewer-body:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.pt-root .coa-viewer-level { min-width: 52px; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.pt-root .coa-viewer-count { min-width: 64px; text-align: center; font: 600 13px/1 var(--font-mono); font-variant-numeric: tabular-nums; color: var(--ink-muted); white-space: nowrap; }
.pt-root .coa-viewer-original {
  display: inline-flex; align-items: center; gap: 4px; height: 40px; padding: 0 12px; box-sizing: border-box; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); color: var(--ink); font: 600 13px/1 var(--font-sans); text-decoration: none; white-space: nowrap;
}
.pt-root .coa-viewer-original:hover { border-color: var(--ink); }
.pt-root .coa-viewer-close { grid-area: close; width: 40px; height: 40px; margin: 0 12px 0 4px; border-radius: var(--radius-pill); background: var(--surface-300); }

.pt-root .coa-viewer-body {
  grid-area: body; position: relative; align-self: stretch; min-height: 0; overflow: auto; overscroll-behavior: contain;
  padding: 16px; border-top: 1px solid var(--line); background: var(--surface-100);
}
/* As wide as the widest page and at least the body: centred when it fits, scrollable to both edges when zoomed. */
.pt-root .coa-viewer-pages { display: grid; justify-items: center; align-content: start; gap: 16px; width: max-content; min-width: 100%; }
.pt-root .coa-viewer-page {
  position: relative; margin: 0; max-width: none; overflow: hidden; border-radius: 4px;
  background: #ffffff center top / 100% auto no-repeat; box-shadow: 0 0 0 1px var(--line), 0 14px 30px -18px rgba(0, 0, 0, 0.8);
}
.pt-root .coa-viewer-page img { display: block; width: 100%; height: 100%; }
.pt-root .coa-viewer-page.is-loading { display: grid; place-items: center; }
.pt-root .coa-viewer-loading {
  padding: 6px 12px; border-radius: var(--radius-pill); background: rgba(9, 12, 19, 0.82); color: #eef1f8; font: 600 12px/16px var(--font-mono);
}
@media (prefers-reduced-motion: no-preference) {
  .pt-root .coa-viewer-loading { animation: coa-pulse 1.2s ease-in-out infinite alternate; }
  @keyframes coa-pulse { from { opacity: .55; } to { opacity: 1; } }
}
.pt-root .coa-viewer-page.is-broken { display: grid; place-items: center; background: var(--surface-200); }
.pt-root .coa-viewer-note { display: grid; justify-items: center; gap: 12px; max-width: 420px; margin: 48px auto; padding: 0 16px; text-align: center; color: var(--ink-muted); font: 400 14px/21px var(--font-sans); }
.pt-root .coa-viewer-note p { margin: 0; }
.pt-root .coa-viewer-more { margin: 0; max-width: 560px; text-align: center; color: var(--ink-muted); font: 400 13px/19px var(--font-sans); }
.pt-root .coa-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

@media (max-width: 759px) {
  .pt-root .coa-viewer { width: 100vw; height: 100vh; height: 100dvh; margin: 0; border: 0; border-radius: 0; box-shadow: none; }
  .pt-root .coa-viewer[open] { animation-name: coa-sheet; }
  @keyframes coa-sheet { from { transform: translateY(24px); opacity: 0; } to { transform: none; opacity: 1; } }
  .pt-root .coa-viewer-frame {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-areas: "head close" "body body" "tools tools";
  }
  .pt-root .coa-viewer-head { padding: max(12px, env(safe-area-inset-top)) 4px 10px 16px; }
  .pt-root .coa-viewer-close { margin-right: 10px; }
  .pt-root .coa-viewer-body { padding: 10px; }
  .pt-root .coa-viewer-tools {
    justify-content: space-between; gap: 6px; padding: 8px 10px max(8px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--line); background: var(--surface-200);
  }
  .pt-root .coa-viewer-count-word, .pt-root .coa-viewer-verb { display: none; }
  .pt-root .coa-viewer-count { min-width: 34px; }
  .pt-root .coa-viewer-btn { min-width: 36px; height: 40px; padding: 0 6px; }
  .pt-root .coa-viewer-level { min-width: 44px; }
  .pt-root .coa-viewer-original { padding: 0 10px; }
}
@media (max-width: 359px) {
  .pt-root .coa-viewer-original-text { display: none; }
  .pt-root .coa-viewer-original { width: 40px; padding: 0; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  .pt-root .coa-viewer[open] { animation: none; }
  .pt-root .coa-thumb { transition: none; }
}