/* v123 — embedded Seilias collision simulations + student inquiry activities */
.simulation-lab-v123{margin:34px 0 42px;padding:26px;border:1px solid #dce4f1;border-radius:24px;background:linear-gradient(180deg,#fbfdff 0%,#f7f9fd 100%);box-shadow:0 14px 34px rgba(30,49,82,.06);scroll-margin-top:110px}
.sim-lab-bridge-v123{background:linear-gradient(180deg,#fffdf8 0%,#fbf8ef 100%);border-color:#eadfbe}
.sim-lab-heading-v123>p:last-child{max-width:900px;color:#5d6a7d;line-height:1.7;margin-bottom:14px}
.sim-lab-heading-v123 h2{margin:.3rem 0 .7rem;color:#17233b}
.sim-credit-v123{display:flex;align-items:center;flex-wrap:wrap;gap:7px 9px;margin:14px 0 18px;padding:10px 12px;border-radius:13px;background:#eef4ff;color:#52627a;font-size:.78rem;line-height:1.45}
.sim-lab-bridge-v123 .sim-credit-v123{background:#f6efd9}
.sim-credit-v123 strong{color:#263a5c}.sim-credit-v123 a{font-weight:850;color:#2d58ad;text-decoration:none}.sim-credit-v123 a:hover{text-decoration:underline}
.sim-player-v123{overflow:hidden;border:1px solid #d7dfeb;border-radius:18px;background:#101929;min-height:178px;box-shadow:0 9px 24px rgba(20,35,60,.10)}
.sim-player-placeholder-v123{min-height:178px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;padding:20px 22px;background:radial-gradient(circle at 10% 20%,rgba(103,139,234,.18),transparent 34%),linear-gradient(135deg,#17233b,#101929);color:#fff}
.sim-player-placeholder-v123 p{margin:5px 0 0;color:#c5d0e2;font-size:.88rem;line-height:1.5}.sim-player-placeholder-v123 strong{font-size:1rem}
.sim-player-icon-v123{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;background:#fff;color:#284d9a;font-size:1.05rem;padding-left:3px;box-shadow:0 7px 18px rgba(0,0,0,.18)}
.sim-load-v123{appearance:none;border:0;border-radius:999px;padding:12px 16px;background:#fff;color:#17233b;font:800 .82rem/1 system-ui,-apple-system,"Segoe UI",sans-serif;cursor:pointer;white-space:nowrap;transition:transform .15s ease,box-shadow .15s ease}
.sim-load-v123:hover{transform:translateY(-1px);box-shadow:0 7px 18px rgba(0,0,0,.18)}
.sim-player-v123 iframe{display:block;width:100%;height:clamp(520px,65vw,760px);border:0;background:#fff}
.sim-player-links-v123{display:flex;justify-content:flex-end;margin:8px 4px 18px}.sim-player-links-v123 a{font-size:.77rem;font-weight:850;color:#355fae;text-decoration:none}.sim-player-links-v123 a:hover{text-decoration:underline}
.sim-task-v123{margin-top:18px;padding:20px 21px;border:1px solid #e0e5ed;border-radius:18px;background:#fff}
.sim-task-title-v123{display:flex;align-items:flex-start;gap:12px;margin-bottom:10px}.sim-task-title-v123>span{flex:0 0 auto;margin-top:2px;padding:6px 9px;border-radius:999px;background:#eaf1ff;color:#2b55aa;font-size:.66rem;font-weight:900;letter-spacing:.08em}.sim-task-title-v123 h3{margin:0;color:#17233b;font-size:1.08rem;line-height:1.4}
.sim-task-v123 ol{margin:12px 0 15px;padding-left:1.45rem}.sim-task-v123 li{padding-left:.2rem;margin:.52rem 0;color:#334155;line-height:1.63}.sim-task-v123 li::marker{font-weight:900;color:#315bb1}
.sim-eq-v123{display:inline-block;padding:2px 6px;border-radius:7px;background:#f2f5fa;color:#1d355b;font-family:Georgia,"Times New Roman",serif;font-size:1.02em}
.sim-questions-v123{margin:15px 0;padding:13px 15px;border-left:4px solid #6f8edc;border-radius:0 12px 12px 0;background:#f2f6ff}.sim-questions-v123 p{margin:0;color:#33445f;line-height:1.6}
.sim-check-v123{margin-top:13px;border-top:1px solid #e5e9f0;padding-top:11px}.sim-check-v123 summary{cursor:pointer;color:#3159a6;font-weight:850;font-size:.86rem}.sim-check-v123 p{margin:.65rem 0 0;color:#566477;line-height:1.65}
.sim-table-wrap-v123{overflow-x:auto;margin:13px 0 15px;border:1px solid #dfe5ee;border-radius:13px;background:#fff}.sim-table-v123{width:100%;min-width:720px;border-collapse:collapse;font-size:.82rem}.sim-table-v123 th,.sim-table-v123 td{padding:10px 11px;border-bottom:1px solid #e8ecf2;border-right:1px solid #edf0f4;text-align:center}.sim-table-v123 th{background:#f1f5fb;color:#263a5c;font-size:.74rem;letter-spacing:.02em}.sim-table-v123 tr:last-child td{border-bottom:0}.sim-table-v123 th:last-child,.sim-table-v123 td:last-child{border-right:0}.sim-table-v123 td{color:#647084}
@media(max-width:760px){.simulation-lab-v123{margin:26px 0 34px;padding:17px;border-radius:20px}.sim-player-placeholder-v123{grid-template-columns:auto 1fr;padding:17px;min-height:190px}.sim-load-v123{grid-column:1/-1;width:100%;min-height:44px}.sim-player-v123 iframe{height:68vh;min-height:520px;max-height:720px}.sim-task-v123{padding:16px}.sim-task-title-v123{flex-direction:column;gap:8px}.sim-credit-v123{font-size:.73rem}.sim-credit-v123>span[aria-hidden="true"]{display:none}}
@media(max-width:430px){.simulation-lab-v123{margin-left:-2px;margin-right:-2px;padding:14px}.sim-player-placeholder-v123{grid-template-columns:1fr;text-align:center}.sim-player-icon-v123{margin:auto}.sim-player-v123 iframe{height:72vh;min-height:500px}.sim-player-links-v123{justify-content:center}.sim-task-v123 ol{padding-left:1.2rem}}