/**
 * Rate-and-ratio motion language: rise-in on enter, slide steppers, soft hover.
 * Colours stay with each page ??this file is timing and transform only.
 */
@keyframes riseIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

@keyframes flashVal {
  0% { transform: scale(1); }
  40% { transform: scale(1.06); }
  100% { transform: scale(1); }
}

.jm-back,
.back,
a.back,
.back-link,
.jm-eyebrow,
.eyebrow,
.lesson-kicker,
.hero,
h1,
.lead,
.lede,
.jm-tabs,
.tabs,
.main-tabs,
.part-title {
  animation: riseIn 0.35s ease both;
}

.jm-eyebrow,
.eyebrow,
.lesson-kicker { animation-delay: 0.04s; }
h1 { animation-delay: 0.08s; }
.lead,
.lede { animation-delay: 0.12s; }
.jm-tabs,
.tabs,
.main-tabs { animation-delay: 0.16s; }
.part-title { animation-delay: 0.2s; }

section.block {
  animation: riseIn 0.4s ease both;
}
section.block:nth-of-type(1) { animation-delay: 0.18s; }
section.block:nth-of-type(2) { animation-delay: 0.26s; }
section.block:nth-of-type(3) { animation-delay: 0.32s; }
section.block:nth-of-type(4) { animation-delay: 0.38s; }

.jm-panel:not(.hidden),
.jm-panel.is-entering,
.lab.active,
.view.active,
.view.is-active,
.cross-step-panel:not(.hidden),
.mode-panel:not(.hidden) {
  animation: riseIn 0.35s ease both;
}

.gallery .topic-card {
  animation: riseIn 0.4s ease both;
}
.gallery .topic-card:nth-child(1) { animation-delay: 0.06s; }
.gallery .topic-card:nth-child(2) { animation-delay: 0.1s; }
.gallery .topic-card:nth-child(3) { animation-delay: 0.14s; }
.gallery .topic-card:nth-child(4) { animation-delay: 0.18s; }
.gallery .topic-card:nth-child(5) { animation-delay: 0.22s; }
.gallery .topic-card:nth-child(6) { animation-delay: 0.26s; }
.gallery .topic-card:nth-child(7) { animation-delay: 0.3s; }
.gallery .topic-card:nth-child(8) { animation-delay: 0.34s; }
.gallery .topic-card:nth-child(9) { animation-delay: 0.38s; }
.gallery .topic-card:nth-child(10) { animation-delay: 0.42s; }
.gallery .topic-card:nth-child(11) { animation-delay: 0.46s; }
.gallery .topic-card:nth-child(12) { animation-delay: 0.5s; }

.step-frame {
  grid-template-columns: 48px minmax(0, 1fr) 48px;
  min-width: 0;
}

.step-viewport,
.step-body,
.step-body.step-viewport {
  overflow: hidden !important;
  padding: 0 !important;
  min-width: 0;
  max-width: 100%;
  min-height: 170px;
  box-sizing: border-box;
}

.step-track {
  display: flex;
  width: 100%;
  transition: transform 0.35s ease;
  will-change: transform;
}

.step-track > .step-panel {
  display: block;
  flex: 0 0 100%;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  overflow: hidden;
  padding: 8px 12px;
}

.step-frame .nav-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.step-frame .nav-btn:hover:not(:disabled) {
  transform: scale(1.05);
}

.step-dots span,
.step-dots button {
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.step-dots span.on,
.step-dots button.on,
.step-dots .on {
  transform: scale(1.25);
}

.jm-page .btn,
.jm-page .badge,
.jm-page .stat-card,
.jm-page .chip {
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.jm-page .btn:hover:not(:disabled),
.jm-page .stat-card:hover {
  transform: translateY(-2px);
}

.stat-card .val.flash {
  animation: flashVal 0.35s ease;
}

@media (max-width: 640px) {
  .step-frame { grid-template-columns: minmax(0, 1fr); }
  .step-viewport,
  .step-body,
  .step-body.step-viewport { order: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .jm-back, .back, a.back, .back-link,
  .jm-eyebrow, .eyebrow, .lesson-kicker,
  .hero, h1, .lead, .lede,
  .jm-tabs, .tabs, .main-tabs, .part-title,
  section.block,
  .jm-panel:not(.hidden), .lab.active,
  .view.active, .view.is-active,
  .cross-step-panel:not(.hidden),
  .gallery .topic-card,
  .step-track {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* JM29 accent ??final override (this sheet loads last on legacy topic pages) */
body.paper-labs .subnav .chip.active,
body.paper-labs .chip.active,
body.paper-labs .btn.active {
  color: #fff !important;
  background: #4FC3F7 !important;
  border-color: #4FC3F7 !important;
}