.demo-section { max-width: 1100px; padding-block: 88px; }
.demo-heading { max-width: 760px; margin-bottom: 30px; }
.demo-eyebrow { margin: 0 0 14px; color: var(--cyan); font-size: 12px; font-weight: 650; letter-spacing: .16em; }
.demo-heading h2 { margin: 0; font-size: clamp(26px, 3.2vw, 42px); line-height: 1.45; letter-spacing: -.025em; }
.demo-heading > p:last-child { margin: 14px 0 0; color: var(--muted); line-height: 1.8; }
.demo-viewer { margin: 0; }
.demo-stage { position: relative; aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: #0b111b; }
.demo-stage video, .demo-start, .demo-start img { display: block; width: 100%; height: 100%; }
.demo-stage video { object-fit: contain; }
.demo-stage [hidden] { display: none !important; }
.demo-start { position: absolute; inset: 0; border: 0; padding: 0; background: #0b111b; cursor: pointer; color: #fff; }
.demo-start img { object-fit: contain; }
.demo-play-icon { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: grid; place-items: center; width: 66px; height: 66px; border: 1px solid rgba(255,255,255,.55); border-radius: 50%; background: rgba(7,17,31,.82); box-shadow: 0 8px 32px rgba(0,0,0,.25); transition: background .18s ease, border-color .18s ease; }
.demo-start:hover .demo-play-icon { background: #153047; border-color: var(--cyan); }
.demo-play-icon::after { content: ''; width: 0; height: 0; margin-left: 4px; border-top: 9px solid transparent; border-bottom: 9px solid transparent; border-left: 14px solid currentColor; }
.demo-start:focus-visible { outline: 3px solid var(--cyan); outline-offset: -5px; }
.demo-caption { display: flex; justify-content: space-between; gap: 16px; margin-top: 17px; color: var(--text); font-size: 15px; line-height: 1.6; }
.demo-caption-meta { color: var(--muted); font-size: 12px; white-space: nowrap; align-self: center; }
.demo-choices { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; margin-top: 30px; }
.demo-choice { min-width: 0; display: flex; flex-direction: column; gap: 10px; padding: 0 0 15px; border: 0; border-bottom: 2px solid var(--line); border-radius: 0; color: var(--muted); background: transparent; text-align: left; cursor: pointer; font: inherit; }
.demo-choice img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: contain; border: 1px solid var(--line); border-radius: 8px; opacity: .7; transition: opacity .18s ease; }
.demo-choice[aria-pressed="true"] { color: var(--text); border-bottom-color: var(--cyan); }
.demo-choice[aria-pressed="true"] img, .demo-choice:hover img { opacity: 1; }
.demo-choice:focus-visible { outline: 2px solid var(--cyan); outline-offset: 5px; }
.demo-choice-title { font-size: 14px; font-weight: 600; line-height: 1.5; }
.demo-choice-meta { font-size: 11px; letter-spacing: .07em; color: var(--muted); }
.demo-error { color: var(--text); line-height: 1.7; }
.demo-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@media (max-width: 640px) {
  .demo-section { padding-block: 58px; }
  .demo-heading { margin-bottom: 22px; }
  .demo-stage { border-radius: 11px; }
  .demo-play-icon { width: 48px; height: 48px; }
  .demo-caption { flex-direction: column; gap: 3px; }
  .demo-caption-meta { align-self: flex-start; }
  .demo-choices { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 16px; margin-top: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  .demo-play-icon, .demo-choice img { transition: none; }
}