/* ============================================================================
 * viewers.css — full-screen viewer overlay (DXF / PDF / images / text / STEP).
 * Owned by the VIEWERS agent.
 *
 * Uses ONLY the design tokens defined by DESIGN-SHELL in tokens.css. No
 * hardcoded colours except the two unavoidable non-token cases, both flagged
 * inline: the backdrop scrim (needs an alpha wash no token provides) and the
 * PDF.js text-layer selection highlight (must be semi-transparent to keep the
 * glyphs beneath legible).
 * ========================================================================== */

/* ------------------------------------------------------------------ shell */

.kr-vw-backdrop {
  position: fixed;
  inset: 0;
  z-index: 900;
  /* Scrim: an alpha wash over arbitrary page content. No token expresses this. */
  background: rgb(0 0 0 / 0.55);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.kr-vw-backdrop[data-open='1'] { opacity: 1; }

.kr-vw {
  position: fixed;
  inset: 0;
  z-index: 901;
  display: flex;
  flex-direction: column;
  /* iPhone Safari: 100vh includes the retracted URL bar and clips the footer.
     dvh tracks the visual viewport; vh stays as the fallback for older WebKit. */
  height: 100vh;
  height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  opacity: 0;
  transform: scale(0.97) translateY(8px);
  transform-origin: 50% 45%;
  transition:
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease);
  will-change: opacity, transform;
}
.kr-vw[data-open='1'] { opacity: 1; transform: none; }
.kr-vw[data-closing='1'] { opacity: 0; transform: scale(0.98) translateY(4px); }

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

.kr-vw__bar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  padding-top: calc(10px + env(safe-area-inset-top));
  padding-left: calc(14px + env(safe-area-inset-left));
  padding-right: calc(14px + env(safe-area-inset-right));
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-1);
  position: relative;
  z-index: 3;
}

.kr-vw__id {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
  flex: 1 1 auto;
}

.kr-vw__icon {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.kr-vw__icon svg { width: 20px; height: 20px; display: block; }

.kr-vw__titles { min-width: 0; display: flex; flex-direction: column; gap: 2px; }

.kr-vw__name {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
  /* German filenames are long ("Stückliste Frästeile.xlsx"); never wrap the bar. */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kr-vw__meta {
  font-size: 11.5px;
  color: var(--text-mute);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-variant-numeric: tabular-nums;
}

.kr-vw__actions { flex: 0 0 auto; display: flex; align-items: center; gap: 8px; }

/* ---------------------------------------------------------------- buttons */

.kr-vw__btn {
  appearance: none;
  -webkit-appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 36px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font: inherit;
  font-size: 13px;
  font-weight: 550;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}
.kr-vw__btn:hover { background: var(--surface-2); border-color: var(--border-hi); color: var(--text); }
.kr-vw__btn:active { transform: translateY(1px); }
.kr-vw__btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.kr-vw__btn[disabled] { opacity: 0.42; pointer-events: none; }
.kr-vw__btn[aria-pressed='true'] {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent-hi);
}
.kr-vw__btn svg { width: 16px; height: 16px; display: block; flex: 0 0 auto; }

.kr-vw__btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.kr-vw__btn--primary:hover { background: var(--accent-hi); border-color: var(--accent-hi); color: var(--on-accent); }

/* Icon-only buttons keep a >=44px touch target via the ::before overlay so the
   visual box can stay compact on desktop. */
.kr-vw__btn--icon { min-width: 36px; padding: 0 9px; position: relative; }
.kr-vw__btn--icon::before {
  content: '';
  position: absolute;
  left: 50%; top: 50%;
  width: 44px; height: 44px;
  transform: translate(-50%, -50%);
}

.kr-vw__btn--close:hover { background: var(--danger); border-color: var(--danger); color: var(--on-accent); }

/* Label collapses on narrow screens, icon stays. */
.kr-vw__btn .kr-vw__lbl { display: inline; }

/* ---------------------------------------------------------------- toolbar */

.kr-vw__tools {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  padding-left: calc(14px + env(safe-area-inset-left));
  padding-right: calc(14px + env(safe-area-inset-right));
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
  position: relative;
  z-index: 2;
}
.kr-vw__tools:empty { display: none; }
.kr-vw__sep { flex: 0 0 auto; width: 1px; height: 22px; background: var(--border); margin: 0 2px; }
.kr-vw__spacer { flex: 1 1 auto; min-width: 4px; }

.kr-vw__readout {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--text-mute);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding: 0 2px;
}

.kr-vw__field {
  appearance: none;
  -webkit-appearance: none;
  min-height: 36px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  min-width: 0;
}
.kr-vw__field::placeholder { color: var(--text-mute); }
.kr-vw__field:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }

/* ------------------------------------------------------------------ body */

.kr-vw__body {
  flex: 1 1 auto;
  position: relative;
  min-height: 0;
  display: flex;
  overflow: hidden;
  padding-bottom: env(safe-area-inset-bottom);
}

/* --------------------------------------------------------------- overlays */

.kr-vw__msg {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  z-index: 5;
  background: var(--bg);
  pointer-events: none;
}
.kr-vw__msg[hidden] { display: none; }
.kr-vw__msg-in { display: flex; flex-direction: column; align-items: center; gap: 12px; max-width: 420px; }
.kr-vw__msg-txt { font-size: 13.5px; color: var(--text-dim); line-height: 1.5; }

.kr-vw__spin {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2.5px solid var(--border-hi);
  border-top-color: var(--accent);
  animation: kr-vw-spin 720ms linear infinite;
}
@keyframes kr-vw-spin { to { transform: rotate(360deg); } }

/* Skeleton shimmer for the pre-first-paint state. */
.kr-vw__skel {
  position: absolute;
  inset: 0;
  z-index: 4;
  background:
    linear-gradient(90deg, transparent, var(--surface-2), transparent) 0 0 / 200% 100% no-repeat,
    var(--surface);
  animation: kr-vw-shim 1.25s var(--ease) infinite;
}
@keyframes kr-vw-shim { to { background-position: 200% 0, 0 0; } }

.kr-vw__banner {
  position: absolute;
  left: 50%;
  top: 12px;
  transform: translateX(-50%);
  z-index: 6;
  max-width: min(560px, calc(100% - 28px));
  padding: 9px 14px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--warn);
  color: var(--text-dim);
  font-size: 12.5px;
  line-height: 1.4;
  box-shadow: var(--shadow-2);
}

/* ------------------------------------------------------------------- DXF */

.kr-dxf { flex: 1 1 auto; display: flex; min-width: 0; position: relative; }

.kr-dxf__stage { flex: 1 1 auto; position: relative; min-width: 0; overflow: hidden; }

.kr-dxf__canvas {
  display: block;
  width: 100%;
  height: 100%;
  /* Required: without this iOS Safari steals the gesture for page scrolling
     and pinch-zooms the document instead of the drawing. */
  touch-action: none;
  cursor: grab;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.kr-dxf__canvas[data-painted='1'] { opacity: 1; }
.kr-dxf__canvas[data-panning='1'] { cursor: grabbing; }

/* Layer drawer */
.kr-dxf__panel {
  flex: 0 0 auto;
  width: 272px;
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border-left: 1px solid var(--border);
  transition: margin-right var(--dur) var(--ease), opacity var(--dur) var(--ease);
  min-height: 0;
}
.kr-dxf__panel[data-open='0'] {
  margin-right: -272px;
  opacity: 0;
  pointer-events: none;
}

.kr-dxf__panel-head {
  flex: 0 0 auto;
  padding: 12px 14px 10px;
  border-bottom: 1px solid var(--border);
}
.kr-dxf__panel-title {
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 9px;
}
.kr-dxf__panel-acts { display: flex; gap: 6px; flex-wrap: wrap; }
.kr-dxf__panel-acts .kr-vw__btn { min-height: 30px; padding: 0 9px; font-size: 12px; flex: 1 1 auto; }

.kr-dxf__list {
  flex: 1 1 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 6px;
  padding-bottom: calc(6px + env(safe-area-inset-bottom));
  overscroll-behavior: contain;
}

.kr-dxf__layer {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  min-height: 44px; /* touch target */
  padding: 6px 8px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.kr-dxf__layer:hover { background: var(--surface); color: var(--text); }
.kr-dxf__layer:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.kr-dxf__layer[data-off='1'] { opacity: 0.45; }

.kr-dxf__eye {
  flex: 0 0 auto;
  width: 18px; height: 18px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  display: block;
  color: var(--text-mute);
  transition: color var(--dur-fast) var(--ease);
}
.kr-dxf__layer[data-off='0'] .kr-dxf__eye { color: var(--accent-text); }
.kr-dxf__eye svg { width: 18px; height: 18px; display: block; }
.kr-dxf__eye:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

.kr-dxf__swatch {
  flex: 0 0 auto;
  width: 13px; height: 13px;
  border-radius: 3px;
  border: 1px solid var(--border-hi);
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.18); /* keeps light swatches readable on light surfaces */
}

.kr-dxf__lname {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kr-dxf__badge {
  flex: 0 0 auto;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-mute);
}
.kr-dxf__badge--off { border-color: var(--warn); color: var(--warn); }

.kr-dxf__count {
  flex: 0 0 auto;
  font-size: 11px;
  color: var(--text-mute);
  font-variant-numeric: tabular-nums;
  min-width: 34px;
  text-align: right;
}

.kr-dxf__only {
  flex: 0 0 auto;
  font-size: 10.5px;
  font-weight: 600;
  padding: 3px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-mute);
  cursor: pointer;
  opacity: 0;
  pointer-events: none; /* invisible must also mean untappable */
  transition: opacity var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.kr-dxf__layer:hover .kr-dxf__only,
.kr-dxf__only:focus-visible { opacity: 1; pointer-events: auto; }
.kr-dxf__only:hover { color: var(--accent-hi); border-color: var(--accent); }
/* Touch devices never hover, so the isolate action must stay visible. */
@media (hover: none) {
  .kr-dxf__only { opacity: 1; pointer-events: auto; padding: 6px 9px; }
}

/* ------------------------------------------------------------------- PDF */

.kr-pdf { flex: 1 1 auto; min-width: 0; position: relative; display: flex; }
.kr-pdf__scroll {
  flex: 1 1 auto;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 18px 0 28px;
  background: var(--surface-2);
  scroll-behavior: auto;
}
.kr-pdf__pages { display: flex; flex-direction: column; align-items: center; gap: 16px; min-width: min-content; }

.kr-pdf__page {
  position: relative;
  background: var(--bg-elev);
  box-shadow: var(--shadow-2);
  border-radius: 2px;
  overflow: hidden;
  flex: 0 0 auto;
}
.kr-pdf__page canvas { display: block; }
.kr-pdf__ph { display: block; }

/* PDF.js text layer. These rules are structurally required by pdf.mjs's
   TextLayer (absolute spans scaled by --scale-factor); they are not decoration.
   Adapted from pdf.js's viewer.css so we do not have to vendor the whole file. */
.kr-pdf__text {
  position: absolute;
  inset: 0;
  overflow: hidden;
  line-height: 1;
  text-size-adjust: none;
  forced-color-adjust: none;
  transform-origin: 0 0;
  z-index: 2;
  opacity: 1;
}
.kr-pdf__text :is(span, br) {
  color: transparent;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
  margin: 0;
}
.kr-pdf__text span.markedContent { top: 0; height: 0; }
/* Selection + search hits must stay translucent so the glyph beneath shows. */
.kr-pdf__text ::selection { background: rgb(90 150 255 / 0.35); }
.kr-pdf__text .kr-hit { background: rgb(255 200 0 / 0.42); border-radius: 2px; }
.kr-pdf__text .kr-hit--on { background: rgb(255 140 0 / 0.62); }

/* ---------------------------------------------------------------- images */

.kr-img { flex: 1 1 auto; min-width: 0; position: relative; overflow: hidden; background: var(--surface-2); }
.kr-img__el {
  position: absolute;
  left: 0; top: 0;
  transform-origin: 0 0;
  max-width: none;
  user-select: none;
  -webkit-user-drag: none;
  touch-action: none;
  image-rendering: auto;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.kr-img__el[data-ready='1'] { opacity: 1; }
.kr-img { cursor: grab; touch-action: none; }
.kr-img[data-panning='1'] { cursor: grabbing; }
/* Checkerboard so transparent PNG/SVG edges are visible in both themes. */
.kr-img__board {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(45deg, var(--surface) 25%, transparent 25%),
    linear-gradient(-45deg, var(--surface) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--surface) 75%),
    linear-gradient(-45deg, transparent 75%, var(--surface) 75%);
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
  opacity: 0.55;
  pointer-events: none;
}

/* ------------------------------------------------------------------ text */

.kr-txt { flex: 1 1 auto; min-width: 0; display: flex; position: relative; }
.kr-txt__scroll {
  flex: 1 1 auto;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  position: relative;
  background: var(--bg);
  /* layout+paint only: `strict` would add size containment, which collapses the
     flex basis of a `flex:1 1 auto` item. */
  contain: layout paint;
}
.kr-txt__spacer { position: relative; width: 100%; }
.kr-txt__win { position: absolute; left: 0; right: 0; top: 0; will-change: transform; }

.kr-txt__row {
  display: flex;
  align-items: flex-start;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 20px;
}
.kr-txt__row:hover { background: var(--surface); }

.kr-txt__ln {
  flex: 0 0 auto;
  width: 62px;
  padding-right: 12px;
  text-align: right;
  color: var(--text-mute);
  user-select: none;
  font-variant-numeric: tabular-nums;
  border-right: 1px solid var(--border);
  position: sticky;
  left: 0;
  background: var(--bg-elev);
  z-index: 1;
}

.kr-txt__src {
  flex: 1 1 auto;
  padding-left: 14px;
  padding-right: 18px;
  white-space: pre;
  color: var(--text);
  tab-size: 4;
  -moz-tab-size: 4;
}
.kr-txt[data-wrap='1'] .kr-txt__src {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.kr-txt[data-wrap='1'] .kr-txt__row { align-items: flex-start; }

.kr-txt__hit {
  background: rgb(255 200 0 / 0.34);
  color: var(--text);           /* override the UA <mark> colour */
  border-radius: 2px;
}
.kr-txt__hit--on { background: var(--accent); color: var(--on-accent); border-radius: 2px; }

/* ------------------------------------------------- info card (STEP / other) */

.kr-info {
  flex: 1 1 auto;
  min-width: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  justify-content: center;
  padding: 32px 20px calc(40px + env(safe-area-inset-bottom));
  background: var(--surface-2);
}

.kr-info__card {
  width: 100%;
  max-width: 620px;
  align-self: flex-start;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  animation: kr-info-in var(--dur-slow) var(--ease) both;
}
@keyframes kr-info-in {
  from { opacity: 0; transform: translateY(10px) scale(0.99); }
  to { opacity: 1; transform: none; }
}

.kr-info__head {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 22px 22px 20px;
  border-bottom: 1px solid var(--border);
}
.kr-info__glyph {
  flex: 0 0 auto;
  width: 54px; height: 54px;
  display: grid; place-items: center;
  border-radius: var(--radius);
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  color: var(--accent-hi);
}
.kr-info__glyph svg { width: 27px; height: 27px; display: block; }
.kr-info__htxt { min-width: 0; }
.kr-info__title {
  font-size: 16px; font-weight: 650; color: var(--text);
  line-height: 1.3;
  overflow-wrap: anywhere;
}
.kr-info__sub { font-size: 12.5px; color: var(--text-mute); margin-top: 3px; }

.kr-info__grid { padding: 6px 22px 4px; }
.kr-info__row {
  display: flex;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.kr-info__row:last-child { border-bottom: 0; }
.kr-info__k { flex: 0 0 40%; max-width: 190px; color: var(--text-mute); }
.kr-info__v {
  flex: 1 1 auto;
  color: var(--text);
  overflow-wrap: anywhere;
  font-variant-numeric: tabular-nums;
}
.kr-info__v--mono { font-family: var(--font-mono); font-size: 12px; }

.kr-info__note {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  margin: 4px 22px 0;
  padding: 13px 15px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-dim);
}
.kr-info__note svg { width: 16px; height: 16px; flex: 0 0 auto; margin-top: 1px; color: var(--text-mute); }

.kr-info__foot { padding: 18px 22px 22px; display: flex; gap: 10px; flex-wrap: wrap; }
.kr-info__foot .kr-vw__btn { min-height: 42px; padding: 0 18px; font-size: 13.5px; }

/* --------------------------------------------------------------- responsive */

@media (max-width: 720px) {
  .kr-vw__btn .kr-vw__lbl { display: none; }
  .kr-vw__btn { padding: 0 9px; min-width: 40px; }
  .kr-vw__btn--primary .kr-vw__lbl { display: inline; }
  .kr-vw__icon { width: 34px; height: 34px; }
  .kr-vw__name { font-size: 13px; }
  .kr-vw__bar { gap: 9px; padding: 9px 11px; padding-top: calc(9px + env(safe-area-inset-top)); }

  /* Layer drawer becomes an overlaying sheet instead of stealing canvas width. */
  .kr-dxf__panel {
    position: absolute;
    right: 0; top: 0; bottom: 0;
    width: min(310px, 88%);
    z-index: 7;
    box-shadow: var(--shadow-2);
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
    margin-right: 0;
  }
  .kr-dxf__panel[data-open='0'] { transform: translateX(100%); margin-right: 0; }

  .kr-txt__ln { width: 48px; padding-right: 8px; }
  .kr-txt__src { padding-left: 10px; }
  .kr-info { padding: 18px 12px calc(30px + env(safe-area-inset-bottom)); }
  .kr-info__head { padding: 18px; gap: 13px; }
  .kr-info__grid { padding: 4px 18px; }
  .kr-info__row { flex-direction: column; gap: 3px; padding: 9px 0; }
  .kr-info__k { flex: none; max-width: none; font-size: 12px; }
  .kr-info__note { margin: 4px 18px 0; }
  .kr-info__foot { padding: 16px 18px 18px; }
  .kr-info__foot .kr-vw__btn { flex: 1 1 auto; }
}

/* --------------------------------------------------------- reduced motion */

@media (prefers-reduced-motion: reduce) {
  .kr-vw,
  .kr-vw-backdrop,
  .kr-dxf__panel,
  .kr-dxf__canvas,
  .kr-img__el,
  .kr-vw__btn,
  .kr-dxf__layer,
  .kr-dxf__only {
    transition-duration: 1ms !important;
  }
  .kr-vw { transform: none !important; }
  .kr-info__card { animation: none; }
  .kr-vw__skel { animation: none; }
  .kr-vw__spin { animation-duration: 1.4s; }
}