:root {
  --im-bg: #061019;
  --im-surface: #0a1925;
  --im-surface-2: #102535;
  --im-line: rgba(138, 196, 220, 0.24);
  --im-text: #edf7fb;
  --im-muted: #91a9b8;
  --im-dr: #55c9ee;
  --im-mr: #43d6b4;
  --im-mr-accent: #e57bb5;
  --im-asset: #efc35b;
  --im-candidate: #f3a84f;
  --im-review: #ef6c67;
  --im-success: #6dd69b;
  --im-topbar-height: 56px;
  --im-max-width: 1600px;
  --im-gap: 16px;
}

.imaging-page {
  background: var(--im-bg);
  color: var(--im-text);
  overflow: hidden;
}

.imaging-bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(85, 201, 238, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(67, 214, 180, 0.06) 0%, transparent 40%),
    linear-gradient(rgba(138, 196, 220, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 196, 220, 0.04) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
}

.imaging-bg-grid::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.15) 2px,
    rgba(0, 0, 0, 0.15) 4px
  );
  opacity: 0.3;
}

@media (prefers-reduced-motion: reduce) {
  .imaging-bg-grid::after {
    animation: none;
    opacity: 0.15;
  }
}

.imaging-page .topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--im-topbar-height);
  background: rgba(6, 16, 25, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--im-line);
  z-index: 100;
}

.imaging-shell {
  position: relative;
  z-index: 10;
  width: 100%;
  height: 100vh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}

.imaging-screen {
  position: relative;
  min-height: calc(100svh - var(--im-topbar-height));
  scroll-snap-align: start;
  padding: calc(var(--im-topbar-height) + 10px) max(16px, calc((100vw - var(--im-max-width)) / 2)) 4px;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

@media (max-width: 1400px) {
  .imaging-screen {
    padding: calc(var(--im-topbar-height) + 6px) max(16px, calc((100vw - var(--im-max-width)) / 2)) 4px;
  }
  .screen-header {
    margin-bottom: 6px;
  }
  .screen-header.compact {
    margin-bottom: 4px;
  }
}

.screen-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
  flex-shrink: 0;
}

.screen-header.compact {
  margin-bottom: 6px;
}

.screen-number {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  border: 1.5px solid var(--im-line);
  border-radius: 8px;
  color: var(--im-dr);
  font: 700 16px var(--font-mono);
  background: var(--im-surface);
}

.screen-header h2 {
  margin: 0;
  color: var(--im-text);
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.25;
}

.screen-desc {
  margin: 4px 0 0;
  color: var(--im-muted);
  font-size: 14px;
  max-width: 900px;
  line-height: 1.5;
}

/* Screen 1: Hero */
.screen-hero {
  justify-content: center;
}

.hero-body {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  width: 100%;
  max-width: var(--im-max-width);
  align-items: center;
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.eyebrow {
  margin: 0;
  color: var(--im-dr);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-left h1 {
  margin: 0;
  color: var(--im-text);
  font-size: clamp(30px, 3.2vw, 44px);
  line-height: 1.15;
}

.hero-subtitle {
  margin: 0;
  color: var(--im-muted);
  font-size: clamp(14px, 1.4vw, 18px);
  line-height: 1.55;
}

.io-schema {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 6px;
}

.io-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface);
}

.io-label {
  color: var(--im-dr);
  font-size: 12px;
  font-weight: 600;
  min-width: 44px;
}

.io-value {
  color: var(--im-text);
  font-size: 14px;
}

.hero-right {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hero-right h3 {
  margin: 0 0 2px;
  color: var(--im-muted);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.capability-tracks {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.capability-track {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--im-line);
  border-radius: 10px;
  background: var(--im-surface);
}

.capability-track.dr {
  border-color: rgba(85, 201, 238, 0.35);
}

.capability-track.mr {
  border-color: rgba(67, 214, 180, 0.35);
}

.capability-track.ct {
  border-color: rgba(145, 169, 184, 0.35);
}

.track-thumb {
  width: 64px;
  height: 48px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--im-surface-2);
}

.track-thumb.placeholder {
  display: grid;
  place-items: center;
  color: var(--im-muted);
  font-size: 11px;
}

.track-info strong {
  display: block;
  color: var(--im-text);
  font-size: 15px;
  margin-bottom: 2px;
}

.track-info small {
  display: block;
  color: var(--im-muted);
  font-size: 12px;
}

.track-badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

.track-badge.deployed {
  background: rgba(85, 201, 238, 0.15);
  color: var(--im-dr);
}

.track-badge.building {
  background: rgba(67, 214, 180, 0.15);
  color: var(--im-mr);
}

.track-badge.planned {
  background: rgba(145, 169, 184, 0.15);
  color: var(--im-muted);
}

.scroll-hint {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--im-muted);
  font-size: 12px;
}

.scroll-hint i {
  width: 18px;
  height: 28px;
  border: 1.5px solid var(--im-line);
  border-radius: 10px;
  position: relative;
}

.scroll-hint i::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 5px;
  background: var(--im-dr);
  border-radius: 2px;
  animation: scrollHint 1.6s ease-in-out infinite;
}

@keyframes scrollHint {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.3; transform: translateX(-50%) translateY(6px); }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-hint i::after { animation: none; }
}

/* Screen 2: Why not naive pairing */
.screen-why {
  justify-content: flex-start;
}

.why-body {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 0.9fr 1.4fr 0.9fr;
  gap: 16px;
  margin-bottom: 10px;
  align-items: stretch;
}

.why-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--im-line);
  border-radius: 12px;
  background: var(--im-surface);
  min-height: 0;
}

.why-col h3 {
  margin: 0;
  color: var(--im-text);
  font-size: 14px;
  font-weight: 600;
}

.why-svg {
  flex: 1 1 auto;
  min-height: 0;
  width: 100%;
}

.svg-title {
  fill: var(--im-muted);
  font-size: 12px;
}

.svg-text {
  fill: var(--im-text);
  font-size: 12px;
}

.svg-box {
  stroke: var(--im-line);
  stroke-width: 1.5;
  fill: var(--im-surface-2);
}

.svg-box-report { stroke: var(--im-dr); }
.svg-box-image { stroke: var(--im-mr-accent); }
.svg-box-context { stroke: var(--im-mr); }

.svg-line {
  stroke: var(--im-mr);
  stroke-width: 2;
}

.svg-line-broken {
  stroke: var(--im-review);
  stroke-width: 2;
}

.why-note {
  margin: 0;
  color: var(--im-muted);
  font-size: 12px;
  line-height: 1.5;
  text-align: center;
}

.series-filmstrip {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}

.filmstrip-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface-2);
}

.filmstrip-item img {
  width: 80px;
  height: 36px;
  object-fit: cover;
  border-radius: 4px;
  background: #000;
}

.filmstrip-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.filmstrip-meta strong {
  color: var(--im-text);
  font-size: 12px;
}

.filmstrip-meta small {
  color: var(--im-muted);
  font-size: 10px;
}

.infrastructure-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px 14px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface);
  color: var(--im-muted);
  font-size: 12px;
  flex-shrink: 0;
}

.strip-arrow {
  width: 14px;
  height: 1.5px;
  background: var(--im-line);
  position: relative;
}

.strip-arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  border-left: 4px solid var(--im-line);
  border-top: 3px solid transparent;
  border-bottom: 3px solid transparent;
}

/* Screen 3: DR Router */
.screen-dr {
  justify-content: flex-start;
}

.dr-body {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr 1.1fr 0.9fr;
  gap: 14px;
  margin-bottom: 10px;
}

.dr-image-panel,
.dr-route-panel,
.dr-schema-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--im-line);
  border-radius: 12px;
  background: var(--im-surface);
  min-height: 0;
}

.dr-image-panel h3,
.dr-route-panel h3,
.dr-schema-panel h3 {
  margin: 0;
  color: var(--im-text);
  font-size: 14px;
  font-weight: 600;
}

.dr-image-frame {
  flex: 1 1 auto;
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

.dr-image-frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.dr-annotations {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.dr-anno {
  position: absolute;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(6, 16, 25, 0.85);
  border: 1px solid;
}

.anno-part {
  color: var(--im-dr);
  border-color: var(--im-dr);
}

.anno-mark {
  color: var(--im-mr);
  border-color: var(--im-mr);
  font-size: 13px;
  padding: 2px 8px;
}

.anno-proj {
  color: var(--im-mr-accent);
  border-color: var(--im-mr-accent);
}

.dr-status {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.dr-status span {
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11px;
  background: var(--im-surface-2);
  color: var(--im-muted);
  border: 1px solid var(--im-line);
}

.dr-route-svg {
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
}

.dr-stage-text {
  fill: var(--im-text);
  font-size: 11px;
}

.dr-stage-small {
  fill: var(--im-muted);
  font-size: 9px;
}

.schema-drawer summary {
  cursor: pointer;
  color: var(--im-dr);
  font-size: 12px;
  padding: 6px 0;
}

.schema-drawer ul {
  margin: 6px 0 0;
  padding-left: 18px;
  color: var(--im-muted);
  font-size: 11px;
  line-height: 1.7;
}

.dr-result-card {
  padding: 12px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface-2);
  font-size: 12px;
}

.dr-result-card pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--im-text);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
}

/* Screen 4: MR Router */
.screen-mr {
  justify-content: flex-start;
}

.mr-fact-bar {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 6px 14px;
  border: 1px solid var(--im-line);
  border-radius: 20px;
  background: var(--im-surface);
  font-size: 12px;
}

.mr-fact-bar strong {
  color: var(--im-mr);
}

.mr-fact-bar small {
  color: var(--im-muted);
}

.mr-body {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mr-filmstrip-wrap {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--im-line);
  border-radius: 12px;
  background: var(--im-surface);
}

.mr-filmstrip-wrap h3 {
  margin: 0;
  color: var(--im-text);
  font-size: 13px;
  font-weight: 600;
}

.mr-filmstrip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.mr-film-item {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 170px;
}

.mr-film-item img {
  width: 170px;
  height: 58px;
  object-fit: cover;
  border-radius: 6px;
  background: #000;
  border: 1px solid var(--im-line);
}

.mr-film-item small {
  color: var(--im-muted);
  font-size: 10px;
  text-align: center;
}

.mr-detail-grid {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  min-height: 0;
}

.mr-detail-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--im-line);
  border-radius: 12px;
  background: var(--im-surface);
  min-height: 0;
}

.mr-detail-card h4 {
  margin: 0;
  color: var(--im-text);
  font-size: 13px;
  font-weight: 600;
}

.mr-atomic-chips {
  flex: 1 1 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-content: flex-start;
  overflow-y: auto;
}

.atomic-chip {
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 11px;
  background: var(--im-surface-2);
  border: 1px solid var(--im-line);
  color: var(--im-text);
}

.atomic-chip.unknown {
  color: var(--im-review);
  border-color: rgba(239, 108, 103, 0.4);
}

.mr-context-svg {
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
}

.teacher-mask-frame {
  flex: 1 1 auto;
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

.teacher-mask-frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.teacher-mask-label {
  position: absolute;
  bottom: 8px;
  left: 8px;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(6, 16, 25, 0.9);
  color: var(--im-mr-accent);
  border: 1px solid var(--im-mr-accent);
}

/* Screen 5: MR_clean */
.screen-mrclean {
  justify-content: flex-start;
}

.mrclean-body {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  gap: 14px;
  margin-bottom: 10px;
}

.mrclean-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--im-line);
  border-radius: 12px;
  background: var(--im-surface);
  min-height: 0;
}

.mrclean-col h3 {
  margin: 0;
  color: var(--im-text);
  font-size: 14px;
  font-weight: 600;
}

.mrclean-nodes {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}

.mrclean-node {
  padding: 10px 12px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface-2);
  font-size: 12px;
  color: var(--im-text);
}

.mrclean-node.unknown {
  border-color: rgba(239, 108, 103, 0.4);
  color: var(--im-review);
}

.mrclean-node small {
  display: block;
  margin-top: 4px;
  color: var(--im-muted);
  font-size: 10px;
}

.mrclean-transform-svg {
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
}

.mrclean-fact-banner {
  flex-shrink: 0;
  padding: 10px 16px;
  border-radius: 8px;
  background: rgba(239, 108, 103, 0.1);
  border: 1px solid rgba(239, 108, 103, 0.3);
  color: var(--im-review);
  font-size: 13px;
  text-align: center;
}

/* Screen 6: Alignment */
.screen-align {
  justify-content: flex-start;
}

.align-body {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 0.85fr 0.75fr 1.1fr;
  gap: 10px;
  margin-bottom: 8px;
  position: relative;
}

.align-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--im-line);
  border-radius: 12px;
  background: var(--im-surface);
  min-height: 0;
}

.align-col h3 {
  margin: 0;
  color: var(--im-text);
  font-size: 14px;
  font-weight: 600;
}

.align-nodes,
.align-targets {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}

.align-node {
  padding: 8px 10px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface-2);
  font-size: 12px;
  color: var(--im-text);
  cursor: default;
  transition: background 0.15s, border-color 0.15s;
}

.align-node:hover,
.align-node:focus {
  background: var(--im-surface);
  outline: none;
}

.align-node.supported { border-color: rgba(109, 214, 155, 0.4); }
.align-node.candidate { border-color: rgba(243, 168, 79, 0.4); }
.align-node.review { border-color: rgba(239, 108, 103, 0.4); }

.align-target-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 6px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface-2);
}

.align-target-card img {
  width: 100%;
  height: 48px;
  object-fit: cover;
  border-radius: 4px;
  background: #000;
}

.align-target-card small {
  color: var(--im-muted);
  font-size: 10px;
  text-align: center;
}

.align-routes-svg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 20;
}

.align-disclaimer {
  flex-shrink: 0;
  padding: 10px 16px;
  border-radius: 8px;
  background: rgba(243, 168, 79, 0.1);
  border: 1px solid rgba(243, 168, 79, 0.3);
  color: var(--im-candidate);
  font-size: 12px;
  text-align: center;
}

/* Screen 7: Integration */
.screen-integration {
  justify-content: flex-start;
}

.integration-body {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.integration-pipelines {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  min-height: 0;
}

.integration-pipeline {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--im-line);
  border-radius: 12px;
  background: var(--im-surface);
  min-height: 0;
}

.integration-pipeline h3 {
  margin: 0;
  color: var(--im-text);
  font-size: 14px;
  font-weight: 600;
}

.nlp-pipeline h3 { color: var(--im-dr); }
.imaging-pipeline h3 { color: var(--im-mr); }

.pipeline-flow {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}

.pipeline-step {
  padding: 10px 12px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface-2);
  font-size: 12px;
  color: var(--im-text);
  text-align: center;
}

.integration-merge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 180px;
}

.merge-svg {
  width: 120px;
  height: 120px;
}

.center-schema {
  padding: 12px;
  border: 1px solid var(--im-asset);
  border-radius: 8px;
  background: rgba(239, 195, 91, 0.08);
  font-size: 11px;
  color: var(--im-asset);
  max-width: 200px;
}

.center-schema pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.5;
}

.integration-assets {
  flex-shrink: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.integration-asset-card {
  padding: 14px;
  border: 1px solid var(--im-line);
  border-radius: 10px;
  background: var(--im-surface);
}

.integration-asset-card.target {
  border-color: rgba(239, 195, 91, 0.35);
}

.integration-asset-card.in_progress {
  border-color: rgba(67, 214, 180, 0.35);
}

.integration-asset-card h4 {
  margin: 0 0 6px;
  color: var(--im-text);
  font-size: 13px;
}

.integration-asset-card .asset-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 10px;
  margin-bottom: 6px;
}

.asset-status.target {
  background: rgba(239, 195, 91, 0.15);
  color: var(--im-asset);
}

.asset-status.in_progress {
  background: rgba(67, 214, 180, 0.15);
  color: var(--im-mr);
}

.integration-asset-card p {
  margin: 0;
  color: var(--im-muted);
  font-size: 11px;
  line-height: 1.5;
}

/* Navigator */
.screen-navigator {
  position: fixed;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.screen-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  width: 42px;
  padding: 6px 2px;
  border: 1px solid var(--im-line);
  border-radius: 8px;
  background: var(--im-surface);
  color: var(--im-muted);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.screen-nav-item:hover {
  background: var(--im-surface-2);
}

.screen-nav-item.active {
  background: var(--im-dr);
  border-color: var(--im-dr);
  color: var(--im-bg);
}

.screen-nav-item span {
  font: 700 11px var(--font-mono);
}

.screen-nav-item small {
  font-size: 9px;
  line-height: 1;
}

.screen-progress {
  position: fixed;
  left: 0;
  bottom: 0;
  right: 0;
  height: 2px;
  z-index: 60;
  background: var(--im-surface);
}

.screen-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--im-dr), var(--im-mr));
  transition: width 0.3s ease;
}

/* Error panel */
.imaging-error {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 20px 28px;
  border: 1px solid var(--im-review);
  border-radius: 10px;
  background: var(--im-surface);
  color: var(--im-review);
  z-index: 200;
}

/* Animations */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.imaging-screen.is-active .hero-left,
.imaging-screen.is-active .hero-right,
.imaging-screen.is-active .why-col,
.imaging-screen.is-active .dr-image-panel,
.imaging-screen.is-active .dr-route-panel,
.imaging-screen.is-active .dr-schema-panel,
.imaging-screen.is-active .mr-filmstrip-wrap,
.imaging-screen.is-active .mr-detail-card,
.imaging-screen.is-active .mrclean-col,
.imaging-screen.is-active .align-col,
.imaging-screen.is-active .integration-pipeline,
.imaging-screen.is-active .integration-asset-card {
  animation: fadeInUp 0.5s ease backwards;
}

/* Compact desktop */
@media (max-width: 1400px) {
  .imaging-screen {
    padding: calc(var(--im-topbar-height) + 6px) max(16px, calc((100vw - var(--im-max-width)) / 2)) 0px;
  }
  .screen-header {
    margin-bottom: 4px;
  }
  .screen-header.compact {
    margin-bottom: 2px;
  }
  .screen-header h2 {
    font-size: 20px;
  }
  .screen-desc {
    font-size: 13px;
  }
  .mr-filmstrip-wrap {
    padding: 8px;
    gap: 4px;
  }
  .mr-filmstrip-wrap h3 {
    font-size: 12px;
  }
  .mr-filmstrip {
    gap: 8px;
  }
  .mr-film-item,
  .mr-film-item img {
    width: 140px;
  }
  .mr-film-item img {
    height: 44px;
  }
  .mr-detail-grid {
    gap: 8px;
  }
  .mr-detail-card {
    padding: 6px;
    gap: 4px;
    border-radius: 10px;
  }
  .mr-detail-card h4 {
    font-size: 12px;
  }
  .atomic-chip {
    padding: 4px 8px;
    font-size: 10px;
  }
  .teacher-mask-label {
    font-size: 10px;
    padding: 3px 8px;
  }
  .align-node {
    padding: 6px 8px;
    font-size: 11px;
  }
  .align-target-card img {
    height: 40px;
  }
  .align-col {
    padding: 8px;
    gap: 6px;
  }
  .align-col h3 {
    font-size: 13px;
  }
}

@media (max-width: 1279px) {
  .hero-body,
  .why-body,
  .dr-body,
  .mrclean-body,
  .align-body,
  .mr-detail-grid,
  .integration-pipelines {
    gap: 10px;
  }
  .hero-left h1 {
    font-size: 26px;
  }
  .screen-header h2 {
    font-size: 20px;
  }
}

/* Tablet and below: disable snap, stack */
@media (max-width: 1180px) {
  .imaging-shell {
    scroll-snap-type: none;
    height: auto;
    overflow-y: visible;
  }
  .imaging-screen {
    min-height: auto;
    padding: calc(var(--im-topbar-height) + 12px) 16px 24px;
  }
  .hero-body,
  .why-body,
  .dr-body,
  .mrclean-body,
  .align-body,
  .mr-detail-grid,
  .integration-pipelines,
  .integration-assets {
    grid-template-columns: 1fr;
  }
  .mr-filmstrip {
    overflow-x: auto;
  }
  .screen-navigator {
    display: none;
  }
  .screen-progress {
    display: none;
  }
  .scroll-hint {
    display: none;
  }
}

@media (max-width: 760px) {
  .mr-film-item,
  .mr-film-item img {
    width: 140px;
  }
  .mr-film-item img {
    height: 56px;
  }
  .capability-track {
    grid-template-columns: 1fr;
  }
}

/* v19: keep the fixed header outside the snap viewport and tighten dense screens. */
@media (min-width: 1181px) {
  .imaging-shell {
    height: calc(100svh - var(--im-topbar-height));
    margin-top: var(--im-topbar-height);
  }

  .imaging-screen {
    min-height: 100%;
    padding: 10px max(72px, calc((100vw - var(--im-max-width)) / 2)) 6px max(16px, calc((100vw - var(--im-max-width)) / 2));
  }

  .screen-hero {
    padding-top: 10px;
  }

  .imaging-screen.is-active .hero-left,
  .imaging-screen.is-active .hero-right,
  .imaging-screen.is-active .why-col,
  .imaging-screen.is-active .dr-image-panel,
  .imaging-screen.is-active .dr-route-panel,
  .imaging-screen.is-active .dr-schema-panel,
  .imaging-screen.is-active .mr-filmstrip-wrap,
  .imaging-screen.is-active .mr-detail-card,
  .imaging-screen.is-active .mrclean-col,
  .imaging-screen.is-active .align-col,
  .imaging-screen.is-active .integration-pipeline,
  .imaging-screen.is-active .integration-asset-card {
    animation: none;
  }

  .mr-body,
  .mr-detail-grid,
  .mr-detail-card,
  .teacher-mask-frame,
  .mrclean-body,
  .mrclean-col,
  .align-body,
  .align-col,
  .integration-body,
  .integration-pipelines,
  .integration-pipeline {
    min-height: 0;
  }

  .mr-detail-grid,
  .mrclean-body,
  .align-body {
    flex: 1 1 0;
    height: 0;
  }

  .mr-detail-grid,
  .mr-detail-card,
  .mrclean-col,
  .align-col,
  .integration-pipeline {
    overflow: hidden;
  }

  .mr-context-svg {
    height: 100%;
  }

  .teacher-mask-frame img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transform: scale(1.28) translateY(-7%);
    transform-origin: center;
  }

  .align-body {
    overflow: hidden;
  }

  .align-routes-svg {
    z-index: 1;
  }

  .align-col {
    position: relative;
    z-index: auto;
    background: rgba(10, 25, 37, 0.95);
  }

  .align-col h3,
  .align-nodes,
  .align-targets {
    position: relative;
    z-index: 2;
  }

  .dr-result-card {
    padding: 10px;
  }

  .dr-result-kicker {
    color: var(--im-muted);
    font-size: 10px;
    line-height: 1.35;
    margin-bottom: 8px;
  }

  .dr-result-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .dr-result-grid div {
    padding: 7px 8px;
    border: 1px solid var(--im-line);
    border-radius: 6px;
    background: rgba(6, 16, 25, 0.42);
  }

  .dr-result-grid span,
  .dr-result-grid strong {
    display: block;
  }

  .dr-result-grid span {
    color: var(--im-muted);
    font-size: 10px;
  }

  .dr-result-grid strong {
    margin-top: 2px;
    color: var(--im-text);
    font-size: 12px;
  }

  .dr-result-method {
    margin-top: 8px;
    color: var(--im-dr);
    font: 10px var(--font-mono);
  }
}

@media (min-width: 1181px) and (max-width: 1400px) {
  .imaging-screen {
    padding-top: 6px;
    padding-bottom: 4px;
  }

  .screen-number {
    width: 38px;
    height: 38px;
    flex-basis: 38px;
  }

  .mr-fact-bar {
    gap: 8px;
    padding: 5px 10px;
    font-size: 11px;
  }

  .mr-fact-bar small {
    display: none;
  }

  .mr-body {
    gap: 8px;
    overflow: hidden;
  }

  .mr-filmstrip-wrap {
    padding: 7px;
  }

  .mr-detail-card {
    padding: 7px;
  }

  .mrclean-body {
    gap: 10px;
    margin-bottom: 6px;
  }

  .mrclean-col {
    padding: 9px;
    gap: 6px;
  }

  .mrclean-node {
    padding: 8px 9px;
    font-size: 11px;
  }

  .mrclean-node small {
    font-size: 9px;
    line-height: 1.35;
  }

  .mrclean-fact-banner,
  .align-disclaimer {
    padding: 5px 12px;
    font-size: 11px;
  }

  .why-body {
    flex: 1 1 0;
    height: 0;
    margin-bottom: 5px;
  }

  .why-col {
    padding: 10px;
    gap: 6px;
    overflow: hidden;
  }

  .series-filmstrip {
    gap: 5px;
    overflow: hidden;
  }

  .filmstrip-item {
    padding: 5px;
    gap: 7px;
  }

  .filmstrip-item img {
    width: 70px;
    height: 30px;
  }

  .filmstrip-meta strong {
    font-size: 11px;
  }

  .filmstrip-meta small {
    font-size: 9px;
  }

  .align-body {
    margin-bottom: 6px;
  }

  .align-col {
    padding: 7px;
    gap: 5px;
  }

  .align-node {
    padding: 5px 7px;
    font-size: 10px;
    line-height: 1.25;
  }

  .align-target-card {
    padding: 4px;
    gap: 2px;
  }

  .align-target-card img {
    height: 34px;
  }

  .align-target-card small {
    font-size: 9px;
    line-height: 1.15;
  }

  .align-target-card img.is-mask {
    object-fit: contain;
  }

  .integration-body {
    gap: 8px;
  }

  .integration-pipelines {
    gap: 10px;
  }

  .integration-pipeline {
    padding: 9px;
    gap: 6px;
  }

  .pipeline-flow {
    gap: 5px;
  }

  .pipeline-step {
    padding: 7px 8px;
    font-size: 11px;
  }

  .integration-merge {
    min-width: 154px;
    gap: 5px;
  }

  .merge-svg {
    width: 90px;
    height: 70px;
  }

  .center-schema {
    max-width: 155px;
    padding: 7px;
  }

  .center-schema pre {
    font-size: 8px;
    line-height: 1.35;
  }

  .integration-assets {
    gap: 8px;
  }

  .integration-asset-card {
    padding: 8px;
  }

  .integration-asset-card h4 {
    margin-bottom: 3px;
    font-size: 12px;
  }

  .integration-asset-card p {
    font-size: 10px;
    line-height: 1.3;
  }

  .screen-navigator {
    right: 10px;
    gap: 4px;
  }

  .screen-nav-item {
    width: 34px;
    padding: 5px 1px;
  }

  .screen-nav-item small {
    font-size: 8px;
  }
}

/* v20: promote real imaging previews and replace the industrial integration panel. */
@media (min-width: 1181px) {
  .capability-track {
    grid-template-columns: 98px 1fr auto;
    min-height: 78px;
  }

  .track-thumb {
    width: 98px;
    height: 64px;
  }

  .series-filmstrip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-rows: repeat(2, minmax(0, 1fr));
    gap: 8px;
    overflow: hidden;
  }

  .filmstrip-item {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 1fr) auto;
    gap: 4px;
    padding: 6px;
    min-height: 0;
    align-items: stretch;
  }

  .filmstrip-item img {
    width: 100%;
    height: 100%;
    min-height: 0;
    object-fit: cover;
  }

  .filmstrip-meta {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
  }

  .filmstrip-meta small {
    white-space: nowrap;
  }

  .mr-filmstrip {
    justify-content: space-between;
    overflow: hidden;
  }

  .mr-film-item,
  .mr-film-item img {
    width: min(12.5vw, 184px);
  }

  .mr-film-item img {
    height: clamp(58px, 4.8vw, 76px);
  }

  .align-targets {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: repeat(3, minmax(0, 1fr));
    gap: 7px;
    overflow: hidden;
  }

  .align-target-card {
    min-height: 0;
    padding: 6px;
    justify-content: center;
  }

  .align-target-card img {
    height: auto;
    aspect-ratio: 3.1 / 1;
    object-fit: cover;
  }

  .align-target-card img.is-mask {
    object-fit: contain;
  }

  .integration-stage {
    flex: 1 1 0;
    min-height: 0;
    height: 0;
    display: grid;
    grid-template-columns: minmax(0, .92fr) minmax(196px, .48fr) minmax(0, 1.2fr);
    gap: 14px;
  }

  .integration-lane,
  .integration-convergence {
    min-height: 0;
    border: 1px solid var(--im-line);
    border-radius: 14px;
    background: linear-gradient(145deg, rgba(16, 37, 53, .92), rgba(6, 16, 25, .72));
  }

  .integration-lane {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 13px;
    overflow: hidden;
  }

  .integration-lane h3 {
    margin: 0;
    font-size: 14px;
    letter-spacing: .02em;
  }

  .integration-lane .pipeline-flow {
    justify-content: space-between;
    gap: 6px;
  }

  .pipeline-step {
    position: relative;
    display: flex;
    align-items: center;
    gap: 9px;
    min-height: 34px;
    padding: 7px 10px;
    text-align: left;
    font-size: 11px;
  }

  .pipeline-step:not(:last-child)::after {
    content: "";
    position: absolute;
    left: 22px;
    top: calc(100% + 1px);
    width: 1px;
    height: 5px;
    background: var(--im-line);
  }

  .pipeline-icon {
    display: grid;
    place-items: center;
    width: 24px;
    height: 24px;
    flex: 0 0 24px;
    border-radius: 7px;
    background: rgba(85, 201, 238, .12);
    color: var(--im-dr);
  }

  .pipeline-icon svg {
    width: 16px;
    height: 16px;
  }

  .image-step .pipeline-icon {
    background: rgba(67, 214, 180, .12);
    color: var(--im-mr);
  }

  .integration-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .integration-preview-card {
    min-width: 0;
    margin: 0;
    border: 1px solid rgba(67, 214, 180, .28);
    border-radius: 8px;
    overflow: hidden;
    background: #000;
  }

  .integration-preview-card img {
    display: block;
    width: 100%;
    height: clamp(52px, 4vw, 72px);
    object-fit: cover;
  }

  .integration-preview-card figcaption {
    padding: 4px 5px;
    background: rgba(6, 16, 25, .92);
    color: var(--im-muted);
    font-size: 9px;
    text-align: center;
    white-space: nowrap;
  }

  .integration-convergence {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 10px 7px;
    background:
      radial-gradient(circle at center, rgba(239, 195, 91, .11), transparent 48%),
      linear-gradient(145deg, rgba(16, 37, 53, .9), rgba(6, 16, 25, .8));
  }

  .convergence-kicker {
    margin: 0;
    color: var(--im-asset);
    font: 700 9px var(--font-mono);
    letter-spacing: .11em;
  }

  .merge-svg {
    width: min(100%, 210px);
    height: min(48%, 190px);
    min-height: 150px;
  }

  .evidence-proof {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 5px;
    width: 100%;
  }

  .proof-chip {
    display: block;
    min-width: 0;
    padding: 5px 4px;
    border: 1px solid rgba(239, 195, 91, .24);
    border-radius: 6px;
    background: rgba(239, 195, 91, .06);
    color: var(--im-text);
    font-size: 9px;
    line-height: 1.25;
    text-align: center;
  }

  .integration-assets {
    min-height: 0;
  }
}

@media (min-width: 1181px) and (max-width: 1400px) {
  .capability-track {
    grid-template-columns: 84px 1fr auto;
    min-height: 70px;
  }

  .track-thumb {
    width: 92px;
    height: 60px;
  }

  .filmstrip-item img {
    height: 100%;
  }

  .mr-film-item,
  .mr-film-item img {
    width: 160px;
  }

  .mr-film-item img {
    height: 70px;
  }

  .align-target-card {
    padding: 5px;
  }

  .align-target-card img {
    height: auto;
    aspect-ratio: 3 / 1;
  }

  .integration-stage {
    grid-template-columns: minmax(0, .92fr) 188px minmax(0, 1.14fr);
    gap: 10px;
  }

  .integration-lane {
    padding: 9px;
    gap: 6px;
  }

  .integration-lane .pipeline-flow {
    gap: 4px;
  }

  .pipeline-step {
    min-height: 29px;
    padding: 5px 7px;
    gap: 7px;
    font-size: 10px;
  }

  .pipeline-icon {
    width: 21px;
    height: 21px;
    flex-basis: 21px;
  }

  .pipeline-icon svg {
    width: 14px;
    height: 14px;
  }

  .pipeline-step:not(:last-child)::after {
    left: 18px;
    height: 3px;
  }

  .integration-preview-card img {
    height: 62px;
  }

  .integration-preview-card figcaption {
    font-size: 8px;
  }

  .merge-svg {
    min-height: 126px;
    height: min(46%, 160px);
  }

  .proof-chip {
    padding: 4px 3px;
    font-size: 8px;
  }
}

@media (max-width: 1180px) {
  .integration-stage {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .integration-lane,
  .integration-convergence {
    padding: 14px;
    border: 1px solid var(--im-line);
    border-radius: 12px;
    background: var(--im-surface);
  }

  .integration-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .integration-preview-card {
    margin: 0;
  }

  .integration-preview-card img {
    width: 100%;
    height: 80px;
    object-fit: cover;
  }

  .evidence-proof {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }
}