.course-twin{--teal:#79e4dd;display:grid;grid-template-columns:minmax(280px,.85fr) minmax(0,1.4fr);color:#fff;background:#041a29;border:1px solid #24404c;margin:0 0 80px;min-height:650px;overflow:hidden;isolation:isolate}
.twin-demo-copy{padding:58px 38px;position:relative;z-index:3;background:linear-gradient(90deg,#041a29,#041a29dd)}
.twin-demo-copy h3{font-size:clamp(36px,3.3vw,54px);line-height:1.05;letter-spacing:-.04em;margin:0 0 22px}.twin-demo-copy h3 em{font-style:normal;color:var(--orange)}
.twin-demo-intro{font-size:15px;color:#a9bdc6;line-height:1.65;margin:0 0 26px;max-width:350px}
.twin-layer-controls{border-top:1px solid #ffffff20;margin-bottom:30px}.twin-layer-controls button{display:flex;align-items:center;text-align:left;width:100%;padding:17px 0;background:none;color:#e4f2f4;border:0;border-bottom:1px solid #ffffff20;gap:16px;cursor:pointer;font-size:16px;transition:background .25s,color .25s}
.layer-symbol{color:var(--teal);font:10px monospace}.layer-sub{display:block;color:#8da7b3;font-size:11px;line-height:1.5;margin-top:5px}.layer-arrow{color:var(--orange);margin-left:auto;font-size:19px}.twin-layer-controls button:hover,.twin-layer-controls button[aria-pressed=true]{background:#79e4dd0a;color:var(--teal)}.twin-connect{cursor:pointer;font-size:12px;min-height:48px;padding:0 18px}
.twin-demo-stage{position:relative;perspective:1100px;min-height:650px;overflow:hidden;background:radial-gradient(ellipse at 50% 47%,#10464d80,transparent 65%)}
.twin-stage-top{position:absolute;inset:25px 25px auto;display:flex;align-items:center;justify-content:space-between;gap:12px;font:9px monospace;letter-spacing:.12em;color:#8eaab5;z-index:3}.twin-stage-top>span:first-child{display:flex;align-items:center;gap:8px;color:#cce6e8}.twin-stage-top i{display:block;width:5px;height:5px;border-radius:50%;background:var(--teal);box-shadow:0 0 13px var(--teal)}
.twin-glow{position:absolute;left:15%;right:15%;top:30%;height:280px;border-radius:50%;background:#2baea622;filter:blur(55px)}
.twin-grid-floor{position:absolute;inset:10% -35% -20%;background-image:linear-gradient(#79e4dd0b 1px,transparent 1px),linear-gradient(90deg,#79e4dd0b 1px,transparent 1px);background-size:42px 42px;transform:perspective(600px) rotateX(65deg);mask-image:radial-gradient(ellipse,#000,transparent 70%)}
.twin-stack{position:absolute;left:50%;top:48%;width:min(75%,480px);aspect-ratio:500/320;transform-style:preserve-3d;transform:translate(-50%,-50%) rotateX(49deg) rotateZ(-27deg);transition:none;will-change:transform}
.twin-plane{position:absolute;inset:0;border:1px solid #79e4dd50;background:#061e29;box-shadow:0 20px 40px #0004;transform-style:preserve-3d;transition:transform 1.5s cubic-bezier(.22,1,.36,1),opacity .7s,box-shadow .7s,border-color .7s}
.twin-plane svg{display:block;width:100%;height:100%}.plane-satellite{transform:translateZ(-65px);background:linear-gradient(135deg,#153a36,#082932)}.plane-aerial{transform:translateZ(25px);background:#07303bbf}.plane-sensors{transform:translateZ(115px);background:#082e3b9e;border-color:#79e4dd80}
.plane-label{position:absolute;bottom:100%;left:0;margin-bottom:7px;white-space:nowrap;font:9px monospace;color:#afd3d2;letter-spacing:.12em;transition:opacity .5s}
.course-twin[data-mode=fused] .plane-satellite{transform:translateZ(0)}.course-twin[data-mode=fused] .plane-aerial{transform:translateZ(2px);background:#07303b33;box-shadow:none}.course-twin[data-mode=fused] .plane-sensors{transform:translateZ(4px);background:transparent;box-shadow:0 0 40px #79e4dd22,0 25px 55px #0004;border-color:#79e4dd}.course-twin[data-mode=fused] .plane-label{opacity:0}
.course-twin[data-focus=satellite] .twin-plane:not(.plane-satellite),.course-twin[data-focus=aerial] .twin-plane:not(.plane-aerial),.course-twin[data-focus=sensors] .twin-plane:not(.plane-sensors){opacity:.22}.course-twin[data-focus=satellite] .plane-satellite,.course-twin[data-focus=aerial] .plane-aerial,.course-twin[data-focus=sensors] .plane-sensors{border-color:var(--orange);box-shadow:0 0 30px #ff641a25}
.twin-scan-line{position:absolute;left:0;right:0;top:0;height:2px;background:#aaffee;box-shadow:0 0 18px #79e4dd;opacity:0;pointer-events:none}.course-twin.is-scanning .twin-scan-line{animation:twin-scan 2.4s ease-in-out 1}
.twin-stage-message{position:absolute;bottom:68px;left:28px;right:28px;text-align:center;z-index:2}.twin-mode-label{font:10px monospace;letter-spacing:.16em;color:var(--teal)}.twin-description{color:#aec5ce;font-size:13px;line-height:1.6;margin:12px auto 0;max-width:440px;min-height:42px}.twin-demo-foot{position:absolute;bottom:20px;left:25px;right:25px;display:flex;justify-content:space-between;gap:14px;font-size:9px;color:#819ca9;line-height:1.4}
@keyframes twin-scan{0%{top:0;opacity:0}15%{opacity:1}85%{opacity:1}100%{top:100%;opacity:0}}
@media(max-width:1050px){.course-twin{grid-template-columns:minmax(260px,.85fr) minmax(0,1.1fr)}.twin-demo-copy{padding:42px 26px}.twin-stage-top{font-size:8px}.twin-stage-top>span:last-child{max-width:80px;text-align:right}.twin-demo-stage{min-height:620px}.twin-stack{width:77%}.twin-demo-foot{flex-direction:column;gap:3px;text-align:center}.twin-stage-message{bottom:82px}}
@media(max-width:760px){.course-twin{display:flex;flex-direction:column;margin-bottom:55px}.twin-demo-copy{padding:36px 24px 28px}.twin-demo-copy h3{font-size:42px}.twin-demo-intro{max-width:none}.twin-layer-controls button{padding:12px 0}.twin-demo-stage{min-height:520px;border-top:1px solid #ffffff15}.twin-stack{width:min(76%,420px);top:45%}.twin-stage-top>span:last-child{max-width:none}.twin-stage-message{bottom:70px}.twin-description{font-size:12px}.twin-demo-foot{font-size:8px}.plane-satellite{transform:translateZ(-45px)}.plane-aerial{transform:translateZ(20px)}.plane-sensors{transform:translateZ(85px)}}
@media(prefers-reduced-motion:reduce){.twin-plane,.twin-stack,.plane-label{transition:none!important}.course-twin.is-scanning .twin-scan-line{animation:none}.twin-grid-floor{transform:none}}

.twin-demo-stage{cursor:move}.twin-stage-top,.twin-stage-message,.twin-demo-foot{pointer-events:none}
.twin-hover-hint{position:absolute;top:55px;left:25px;color:#89a7b4;font-size:10px;letter-spacing:.03em;z-index:3;pointer-events:none}
@media(hover:none),(prefers-reduced-motion:reduce){.twin-hover-hint{display:none}.twin-demo-stage{cursor:default}}

.twin-playback{display:block;margin-top:18px;padding:7px 0;background:none;border:0;color:#9cb7c2;font:12px Arial,sans-serif;text-decoration:underline;text-underline-offset:4px;cursor:pointer}.twin-playback:hover{color:#fff}

/* Keep the benefits close to the interactive course view. */
.course-twin + .proof-grid{margin-top:0}