.umbral{--u-c0:var(--z-arena-deep);--u-c1:var(--z-arena-deep);--u-c2:var(--z-fusion-2);--u-c3:var(--z-fusion-1);background:0 0;line-height:0;position:relative;top:-2px}.umbral--alba{--u-c0:var(--z-d);--u-c1:var(--z-d);--u-c2:var(--z-fusion-1);--u-c3:var(--z-fusion-2);top:-1px}.umbral>.umbral-arco{width:100%;height:clamp(130px,22vh,240px);display:block}.medio-puente{opacity:.5;filter:blur(2px);pointer-events:none;width:min(74vw,1180px);height:auto;position:absolute;bottom:0;left:0}.medio-puente--vuelta{opacity:.7;filter:blur(1px);background:radial-gradient(92% 86% at 42% 74%,#0b04108c,#0000 78%);left:auto;right:0;transform:scaleX(-1)}@media (max-width:880px){.medio-puente--ida{opacity:.42;width:120vw}}