/* USB read status — reserved layout. Animate only opacity, visibility and transform. */

html { scrollbar-gutter: stable; }

.usb-talk {
  display: none;
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.45rem 1.5rem 1.35rem;
  max-width: 38rem;
  box-sizing: border-box;
}
body.is-usb-talk .usb-talk { display: block; }
body.is-usb-talk #usb-setup,
body.is-usb-talk .notice { display: none; }

/* Cartoon graphic and spare log are retired; hidden from first paint so height is stable. */
.usb-link-graphic,
.usb-ptplog { display: none; }

.usb-talk .extra-kicker { margin-top: 0; }

/* Slim gold progress hairline — width change is scaleX only. */
.usb-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: color-mix(in srgb, var(--line) 80%, transparent);
  overflow: hidden;
  pointer-events: none;
}
.usb-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.45s ease;
}

.usb-heading-swap {
  display: grid;
  grid-template-areas: "h";
  margin: 0.35rem 0 0.35rem;
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  font-weight: 680;
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.usb-heading-swap > span {
  grid-area: h;
  margin: 0;
  font: inherit;
  letter-spacing: inherit;
  line-height: inherit;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.usb-h-done,
.usb-h-error,
.usb-h-nocount { opacity: 0; visibility: hidden; }
.is-done .usb-h-run,
.is-error .usb-h-run,
.is-nocount .usb-h-run { opacity: 0; visibility: hidden; }
.is-done .usb-h-done { opacity: 1; visibility: visible; }
.is-error .usb-h-error { opacity: 1; visibility: visible; }
.is-nocount .usb-h-nocount { opacity: 1; visibility: visible; }
.is-done .usb-h-error,
.is-done .usb-h-nocount,
.is-error .usb-h-done,
.is-error .usb-h-nocount,
.is-nocount .usb-h-done,
.is-nocount .usb-h-error { opacity: 0; visibility: hidden; }

.usb-talk-sub {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
  min-height: 1.45em;
}

/* Status log — icon | step title | optional detail, one full-width line. */
.usb-steps {
  list-style: none;
  margin: 0 0 0.85rem;
  padding: 0.15rem 0 0.2rem;
  width: 100%;
  box-sizing: border-box;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums lining-nums;
  line-height: 1.35;
}
.usb-steps li {
  display: grid;
  grid-template-columns: 1.1rem auto minmax(0, 1fr);
  column-gap: 0.7rem;
  align-items: center;
  box-sizing: border-box;
  width: 100%;
  min-height: 1.85rem;
  padding: 0.32rem 0;
  color: var(--muted);
  transition: color 0.3s ease;
}
.usb-steps li.active,
.usb-steps li.done { color: var(--ink); }
.usb-steps li.error { color: var(--ink); }
.usb-steps .st {
  font-weight: 400;
  font-size: inherit;
  white-space: nowrap;
}
.usb-step-copy { min-width: 0; }
.usb-tick { display: none; }

.usb-mark {
  width: 1.1rem;
  height: 1.1rem;
  position: relative;
  display: block;
  flex: none;
}

/* Active line: a slim blinking caret, not a spinner. */
.usb-steps li.active .usb-mark::after {
  content: "";
  position: absolute;
  left: 0.12rem;
  top: 0.22rem;
  width: 1px;
  height: 0.7em;
  background: var(--gold);
  animation: usb-caret 1.05s steps(1) infinite;
}
@keyframes usb-caret {
  50% { opacity: 0; }
}

/* Done: thin navy tick. */
.usb-steps li.done .usb-mark::before {
  content: "";
  position: absolute;
  left: 0.14rem;
  top: 0.2rem;
  width: 0.26rem;
  height: 0.46rem;
  border-right: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  transform: rotate(40deg);
}

/* Error: hairline burgundy cross. */
.usb-steps li.error .usb-mark::before,
.usb-steps li.error .usb-mark::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0.52rem;
  width: 0.7rem;
  height: 1px;
  background: var(--accent-2);
  animation: none;
}
.usb-steps li.error .usb-mark::before { transform: rotate(45deg); }
.usb-steps li.error .usb-mark::after { transform: rotate(-45deg); }

.usb-steps li.unavailable { color: var(--ink); }
.usb-steps li.unavailable .usb-mark::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.52rem;
  width: 0.55rem;
  height: 1px;
  background: var(--muted);
}
.usb-steps li.unavailable .usb-detail { color: var(--muted); }

.usb-detail,
.usb-steps .pr-detail {
  min-width: 0;
  text-align: right;
  color: var(--muted);
  font-variant-numeric: tabular-nums lining-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.usb-detail {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.usb-steps li.active .usb-detail,
.usb-steps li.done .usb-detail,
.usb-steps li.error .usb-detail,
.usb-steps li.unavailable .usb-detail {
  opacity: 1;
  visibility: visible;
}
.usb-steps li.error .usb-detail { color: var(--accent-2); }

/* Confirm is reserved from the start so revealing it does not move the log. */
.usb-confirm {
  margin: 0.2rem 0 0;
  padding: 0.75rem 0 0.15rem;
  min-height: 5.6rem;
  box-sizing: border-box;
  border-top: 1px solid transparent;
  background: transparent;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.usb-confirm.is-on {
  opacity: 1;
  visibility: visible;
  border-top-color: var(--line);
}
.is-error .usb-confirm:not(.is-on) {
  min-height: 0;
  height: 0;
  margin: 0;
  padding: 0;
  border: 0;
  overflow: hidden;
}
.usb-confirm-found {
  margin: 0 0 0.28rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums lining-nums;
}
.usb-confirm-actions { margin: 0 0 0.3rem; }
.usb-confirm-actions a {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.8rem;
  letter-spacing: 0.01em;
  text-decoration: none;
}
.usb-confirm-actions a:hover {
  text-decoration: underline;
  text-underline-offset: 0.18em;
}
.usb-confirm-note {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--ink-soft);
}

.usb-error {
  margin: 1rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  opacity: 0;
  visibility: hidden;
  max-height: 0;
  overflow: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.is-error .usb-error,
.is-nocount .usb-nocount {
  opacity: 1;
  visibility: visible;
  max-height: none;
  overflow: visible;
  pointer-events: auto;
}
.usb-nocount {
  margin: 1rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  opacity: 0;
  visibility: hidden;
  max-height: 0;
  overflow: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.usb-nocount h2 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
}
.usb-nocount-log {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--ink-soft);
}
.usb-error h2 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
}
.usb-error-msg {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-soft);
}
.usb-error h3 {
  margin: 0 0 0.4rem;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.usb-tips {
  margin: 0 0 1rem;
  padding: 0 0 0 1.15rem;
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.5;
}
.usb-tips li { margin: 0 0 0.35rem; }
.usb-tips li:last-child { margin-bottom: 0; }
.usb-tips code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: color-mix(in srgb, var(--bg) 80%, var(--line));
  padding: 0.05rem 0.3rem;
  border-radius: 2px;
}
.usb-error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem 1rem;
  min-height: 2.6rem;
}
.usb-error-actions .btn[hidden],
.is-error.no-retry .usb-error-actions .btn { display: none; }
.usb-not-charged {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

@media (prefers-reduced-motion: reduce) {
  .usb-progress-bar,
  .usb-steps li,
  .usb-heading-swap > span,
  .usb-confirm,
  .usb-error,
  .usb-nocount,
  .usb-detail { transition: none; }
  .usb-steps li.active .usb-mark::after { animation: none; opacity: 1; }
}