/* ============================================================
   INTRO · Overlay del video de introducción
   ============================================================ */
.intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(27, 31, 35, 0.85);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
.intro-overlay.open { display: flex; }

.intro-box {
  position: relative;
  width: min(960px, 100%);
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
}
.intro-box iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}