.retra-media-section .stratos-media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 900px) {
    .retra-media-section .stratos-media-grid { grid-template-columns: 1fr; }
}

.stratos-product-hero .retra-hero-endo {
    /* Trim the footage's outer edge without scaling down the video itself. */
    clip-path: circle(46% at 50% 50%);
}

.retra-coupling-section { max-width: 1200px; margin: 0 auto; padding: 0 40px 80px; }
.retra-coupling-inner { border-top: 1px solid var(--line); padding-top: 64px; }
.retra-coupling-title { color: var(--ink); font-size: clamp(26px, 3vw, 34px); font-weight: 500; line-height: 1.3; letter-spacing: -.8px; margin: 0 0 24px; }
.retra-coupling-lead { max-width: 1000px; color: var(--muted); font-size: 17px; line-height: 1.8; margin: 0 0 40px; }
.retra-coupling-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 48px; }
.retra-coupling-option { min-width: 0; }
.retra-coupling-option h3 { border-block: 1px solid #b9d1df; padding: 18px 0; margin: 0 0 28px; color: var(--ink); font-size: 26px; line-height: 1.3; font-weight: 500; text-align: center; letter-spacing: -.5px; }
.retra-coupling-option h4 { color: var(--ink); font-size: 18px; line-height: 1.5; font-weight: 500; margin: 0 0 16px; }
.retra-coupling-option p { color: var(--muted); font-size: 16px; line-height: 1.85; margin: 0 0 18px; }
.retra-coupling-option p:last-child { margin-bottom: 0; }
@media (max-width: 700px) { .retra-coupling-grid { grid-template-columns: 1fr; gap: 36px; } }
@media (max-width: 600px) { .retra-coupling-section { padding: 0 22px 48px; } .retra-coupling-inner { padding-top: 40px; } .retra-coupling-lead { font-size: 16px; margin-bottom: 30px; } }

.retra-coupling-placeholder { aspect-ratio: 8 / 5; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; margin-bottom: 24px; border: 1px dashed #bfd3df; border-radius: 10px; background: #f5f9fb; color: #608092; text-align: center; padding: 24px; }
.retra-coupling-placeholder-icon { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid #ccdee9; border-radius: 50%; color: #087cad; font-size: 24px; font-weight: 400; }
.retra-coupling-placeholder > span:not(.retra-coupling-placeholder-icon) { font-size: 18px; font-weight: 500; }
.retra-coupling-placeholder small { font-size: 13px; line-height: 1.5; }

/* Give RETRA the main visual focus; Universal remains a supporting option. */
.retra-coupling-grid { grid-template-columns: minmax(0, 4fr) minmax(190px, 1fr); gap: 36px; align-items: start; }
.retra-coupling-primary { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; }
.retra-coupling-primary .retra-coupling-placeholder { margin: 0; aspect-ratio: 1; }
.retra-coupling-primary h3 { border: 0; padding: 0; margin: 0 0 16px; text-align: left; color: var(--blue); font-size: 32px; }
.retra-coupling-secondary { border-left: 1px solid var(--line); padding: 8px 0 8px 24px; }
.retra-coupling-secondary .retra-coupling-secondary-label { margin: 0 0 12px; font-size: 11px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; }
.retra-coupling-secondary h3 { border: 0; padding: 0; margin: 0 0 16px; font-size: 19px; text-align: left; letter-spacing: 0; }
.retra-coupling-secondary p { font-size: 14px; line-height: 1.75; }
@media (max-width: 950px) {
    .retra-coupling-grid { grid-template-columns: 1fr; gap: 28px; }
    .retra-coupling-secondary { border-left: 0; border-top: 1px solid var(--line); padding: 24px 0 0; }
    .retra-coupling-secondary p { max-width: 680px; }
}
@media (max-width: 600px) { .retra-coupling-primary { grid-template-columns: 1fr; gap: 24px; } .retra-coupling-primary .retra-coupling-placeholder { aspect-ratio: 8 / 5; } }

/* Product photography: primary RETRA image with a smaller Universal companion. */
.retra-coupling-grid { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); }
.retra-coupling-primary { grid-template-columns: 1fr; gap: 24px; }
.retra-coupling-image { display: block; width: 100%; height: auto; }
.retra-coupling-secondary { display: grid; grid-template-columns: minmax(0, 180px) minmax(0, 1fr); gap: 20px; align-items: start; }
.retra-coupling-universal-image { display: block; width: 100%; max-width: 180px; height: auto; }
@media (max-width: 950px) {
    .retra-coupling-grid { grid-template-columns: 1fr; }
    .retra-coupling-image { max-width: 620px; }
}
@media (max-width: 420px) {
    .retra-coupling-secondary { grid-template-columns: minmax(0, 120px) minmax(0, 1fr); gap: 16px; }
}