.vm-shadow-model, .vm-shadow-practice { margin: 1.75rem 0 2rem; padding: clamp(1rem, 3vw, 1.75rem); border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.prose .vm-shadow-model h3, .prose .vm-shadow-practice h3 { margin: 0 0 1rem; font-size: 1.3rem; line-height: 1.4; }
.vm-shadow-model > input { width: 1.5rem; height: 1.5rem; margin: .5rem .5rem .5rem 0; vertical-align: middle; accent-color: var(--ink); }
.vm-shadow-model > label { display: inline-block; max-width: calc(100% - 2.5rem); min-height: 44px; padding: .5rem 0; vertical-align: middle; font-weight: 750; font-size: 1rem; cursor: pointer; }
.vm-shadow-panels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1.25rem; }
.vm-shadow-panel { min-width: 0; padding: 1rem; border: 1px solid var(--line); border-radius: 12px; }
.prose .vm-shadow-panel h4 { margin: 0 0 1rem; font-size: 1.1rem; line-height: 1.4; }
.vm-shadow-panel dl { margin: 0; font-size: 1rem; }
.vm-shadow-panel dl > div { display: flex; justify-content: space-between; gap: .5rem; padding: .25rem 0; }
.vm-shadow-panel dd { margin: 0; font-weight: 750; }
.prose .vm-shadow-formula { margin: 1rem 0; font-size: 1.1rem; }
.vm-shadow-track { height: 14px; overflow: hidden; background: var(--paper-deep); border-radius: 3px; }
.vm-shadow-bar { display: block; height: 100%; width: 40%; background: var(--ink); }
.prose .vm-shadow-scale { display: flex; justify-content: space-between; margin: .3rem 0 .6rem; font-size: .9rem; }
.prose .vm-shadow-signal { margin: 0; font-size: 1rem; }
.vm-shadow-equal { display: none; }
#igualar-iluminacion:checked ~ .vm-shadow-panels .vm-shadow-initial, #igualar-iluminacion:checked ~ .vm-shadow-result .vm-shadow-initial { display: none; }
#igualar-iluminacion:checked ~ .vm-shadow-panels .vm-shadow-equal, #igualar-iluminacion:checked ~ .vm-shadow-result .vm-shadow-equal { display: inline; }
#igualar-iluminacion:checked ~ .vm-shadow-panels .vm-shadow-bar-b { width: 80%; }
.prose .vm-shadow-result { margin: 1.25rem 0 1rem; padding-left: 1rem; border-left: 4px solid var(--coral); font-size: 1rem; }
.prose .vm-shadow-note { margin-bottom: 0; font-size: 1rem; }
.vm-shadow-kicker { display: inline-block; margin-bottom: .75rem; color: var(--ink); background: var(--mint); border-radius: 6px; padding: .25rem .6rem; font-size: .9rem; font-weight: 800; }
.vm-shadow-practice .button { max-width: 100%; white-space: normal; text-align: center; }
.vm-shadow-practice details { margin-top: 1.5rem; border-top: 1px solid var(--line); }
.vm-shadow-practice summary { cursor: pointer; min-height: 44px; padding: 1rem 0; font-weight: 750; font-size: 1rem; }
.vm-shadow-model > input:focus-visible, .vm-shadow-practice summary:focus-visible, .vm-shadow-return a:focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; }
.vm-shadow-return { margin: 1rem 0 0; font-size: 1rem; }
.vm-shadow-return a { display: inline-block; min-height: 44px; padding: .5rem 0; font-weight: 700; }
#comparacion-sombras, #practica-sombras, #checkershadow-stage-title { scroll-margin-top: 120px; }
@media (max-width: 600px) { .vm-shadow-panels { grid-template-columns: minmax(0, 1fr); } }