/* V18: quiet contour drawing. Keep the silhouette sharp, soften only seabed lines.
   Loaded after V17; original geometry, colors, layout and motion stay intact. */
.seabed-edge{opacity:.48}
.contour-coral{opacity:.88}
.contour-fine{opacity:.35}
.contour-ground{opacity:.52;filter:blur(.55px)}
@media(max-width:1100px){.seabed-edge{opacity:.44}}
@media(max-width:800px){.seabed-edge{opacity:.42}}
@media(max-width:480px){.seabed-edge{opacity:.4}}