:root {
  --atlas-image-bg: #eef2f1;
  --atlas-border: #cad7d4;
}

.atlas-hero {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
  background: #edf5f3;
  border-bottom: 1px solid var(--color-border);
}

.atlas-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.75fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.atlas-hero h1 {
  max-width: 16ch;
  margin: 0.45rem 0 1rem;
}

.atlas-boundary {
  padding: 1.4rem;
  background: #fff;
  border: 1px solid var(--atlas-border);
  border-left: 5px solid var(--color-accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.atlas-boundary h2 { margin-top: 0; font-size: 1.15rem; }
.atlas-main { padding-block: 2.5rem 5rem; }

.atlas-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.atlas-metrics article {
  padding: 1.2rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.atlas-metrics strong { display: block; color: var(--color-primary); font-size: 1.8rem; }
.atlas-metrics span { color: var(--color-text-muted); }

.system-overview {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.system-overview button {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  color: var(--color-text);
  text-align: left;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.system-overview button:hover,
.system-overview button:focus-visible,
.system-overview button[aria-pressed="true"] {
  border-color: var(--color-primary);
  background: #f0f7f5;
}

.system-overview small { color: var(--color-text-muted); }

.atlas-filters {
  display: grid;
  grid-template-columns: 1.5fr repeat(6, minmax(135px, 0.75fr));
  gap: 0.8rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  position: sticky;
  top: 0.5rem;
  z-index: 10;
  box-shadow: var(--shadow-sm);
}

.atlas-classification-boundary { margin: 0.8rem 0 0; }
.atlas-classification-boundary p { margin: 0; }

.atlas-filter-meta,
.atlas-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 1rem 0;
}

.atlas-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.atlas-card {
  min-width: 0;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.atlas-card__image {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: var(--atlas-image-bg);
  cursor: zoom-in;
}

.atlas-card__image img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
}

.atlas-card__body { padding: 1rem; }
.atlas-card__body h3 { margin: 0.55rem 0; font-size: 1.05rem; }
.atlas-card__meta { color: var(--color-text-muted); font-size: 0.88rem; }
.atlas-card details { margin-top: 0.7rem; }
.atlas-card details p { font-size: 0.9rem; }
.trace-code { overflow-wrap: anywhere; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.76rem; }

.atlas-pagination { justify-content: center; margin-top: 1.5rem; }
.atlas-pagination button:disabled { opacity: 0.45; cursor: not-allowed; }

.atlas-viewer {
  width: min(1500px, 96vw);
  max-width: none;
  height: min(92vh, 960px);
  padding: 0;
  border: 0;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 80px rgb(12 35 31 / 34%);
}

.atlas-viewer::backdrop { background: rgb(7 23 21 / 72%); }

.atlas-viewer__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.atlas-viewer__toolbar h2 { margin: 0; font-size: 1.25rem; }
.icon-button { width: 2.5rem; height: 2.5rem; font-size: 1.7rem; border: 0; border-radius: 50%; background: #eef3f2; cursor: pointer; }

.atlas-viewer__body {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(320px, 0.8fr);
  height: calc(100% - 78px);
}

.atlas-viewer__stage {
  display: grid;
  place-items: center;
  overflow: auto;
  min-height: 0;
  padding: 1rem;
  background: #15201e;
}

.atlas-viewer__stage img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  transform: scale(var(--viewer-scale, 1));
  transform-origin: center;
  transition: transform 140ms ease;
}

.atlas-viewer__details { overflow: auto; padding: 1rem 1.2rem 2rem; }
.viewer-controls { position: sticky; top: 0; z-index: 2; padding-bottom: 0.7rem; background: #fff; }
.viewer-meta-list { display: grid; gap: 0.55rem; padding: 0; list-style: none; }
.viewer-meta-list strong { color: var(--color-primary); }
.source-caption { padding: 0.9rem; background: #f5f7f6; border-left: 4px solid var(--color-accent); }

.plate-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.55rem; }
.plate-strip button { padding: 0; border: 2px solid transparent; border-radius: 0.45rem; background: var(--atlas-image-bg); cursor: pointer; }
.plate-strip button[aria-current="true"] { border-color: var(--color-primary); }
.plate-strip img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: contain; }

@media (max-width: 1050px) {
  .atlas-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .atlas-filters { grid-template-columns: repeat(3, minmax(0, 1fr)); position: static; }
  .system-overview { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .atlas-hero__grid,
  .atlas-viewer__body { grid-template-columns: 1fr; }
  .atlas-metrics,
  .system-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .atlas-filters { grid-template-columns: 1fr 1fr; }
  .atlas-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .atlas-viewer__body { overflow: auto; height: calc(100% - 78px); }
  .atlas-viewer__stage { min-height: 52vh; overflow: auto; }
  .atlas-viewer__details { overflow: visible; }
  .atlas-filter-meta { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 480px) {
  .atlas-metrics,
  .system-overview,
  .atlas-filters,
  .atlas-grid { grid-template-columns: 1fr; }
  .atlas-pagination { flex-wrap: wrap; }
  .atlas-viewer { width: 100vw; height: 100vh; border-radius: 0; }
  .viewer-controls { display: grid; grid-template-columns: repeat(3, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .atlas-viewer__stage img { transition: none; }
}