.svs-wrap{position:relative;display:block}
.svs-box{position:relative;background:#000;border-radius:16px;overflow:hidden}
.svs-video-frame{position:relative;background:#000}
.svs-video-frame::before{content:'';display:block;padding-top:75%} /* 3:4 aspect */
#svs-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:#000;z-index:1}
.svs-overlay{position:absolute;inset:0;pointer-events:auto;display:flex;flex-direction:column;justify-content:flex-end;background:linear-gradient(180deg,rgba(0,0,0,0) 40%, rgba(0,0,0,0.75) 100%);z-index:2}
.svs-hint{color:#fff;margin:0.5rem 0.75rem;font-size:.95rem}
#svs-start{pointer-events:auto;margin:0.5rem 0.75rem 0.5rem;align-self:flex-start;background:#10b981;color:#fff;border:none;border-radius:10px;padding:.65rem 1rem;font-weight:700;cursor:pointer}
#svs-start[disabled]{opacity:.6;cursor:not-allowed}
.svs-msg{color:#fff;margin:0 0.75rem .8rem;font-size:.9rem;font-weight:600}
.svs-debug{color:#fff;margin:0 .75rem 1rem;font-size:.8rem;font-family:monospace;display:none}
@media (max-width:640px){ .svs-wrap{max-width:100%} }