/* details/summary reset */
.proof-box > summary {
    list-style: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    user-select: none;
}
.proof-box > summary::-webkit-details-marker { display: none; }

/* toggle icons (scoped) */
.proof-toggle .icon { 
    margin-top:2%;
    transition: transform 0.15s;
    width:24px; 
    height:24px; 
    image-rendering:pixelated; 
}
.icon:hover{ transform: scale(1.4); }

.proof-box .minus { 
    display:none; 
}

.proof-box[open] .plus { 
    display:none; 
}

.proof-box[open] .minus { 
    display:inline; 
}

/* animated container */
.proof-content {
    overflow: hidden;
    max-height: 0;
    transition: max-height 240ms ease;
    border-left: 2px solid #9EFF83;
    padding-left: 12px;
    margin: 8px 0 12px;
}
.proof-box[open] .proof-content { 
    max-height: 2000px; 
}

/* responsive media */
.video-frame {
    width:75%;
    aspect-ratio:16 / 9;
    margin-bottom:2%;
    border:1px solid #9EFF83;
    background:#000;
}

.video-frame iframe {
    width:100%;
    height:100%;
    border:0;
    display:block;
}

@media (max-width:700px) {
    .video-frame {
        width:100%;
    }

    .proof-content img {
        width:100%;
        max-width:100%;
    }
}

/* accessibility helper */
.visually-hidden {
    position:absolute !important;
    height:1px; width:1px;
    overflow:hidden; clip:rect(1px,1px,1px,1px);
    white-space:nowrap;
}

/* motion preference */
@media (prefers-reduced-motion: reduce) {
    .proof-content { transition:none; }
}