/* v125 — Seilias solid body simulation labs */
.sim-group-v125{margin:28px 0 42px;padding:26px;border:1px solid #d9e2f0;border-radius:26px;background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%);box-shadow:0 14px 34px rgba(30,49,82,.06)}
.sim-group-v125 *{box-sizing:border-box}.sim-group-v125 .sim-group-kicker-v125{margin:0 0 6px;color:#6b55d8;font-size:.74rem;font-weight:900;letter-spacing:.09em;text-transform:uppercase}
.sim-group-v125 h3{margin:.1rem 0 .45rem;color:#17233b;font-size:1.35rem}
.sim-group-v125>p{max-width:900px;color:#5c6778;line-height:1.7;margin:.25rem 0 0}
.sim-grid-v125{display:grid;gap:16px;margin-top:20px}
.sim-lab-v125{padding:20px;border:1px solid #dfe6f1;border-radius:22px;background:#fff;scroll-margin-top:112px}
.sim-lab-v125.is-optional{background:linear-gradient(180deg,#fffdf8 0%,#fff9ef 100%);border-color:#ecd9b4}
.sim-lab-top-v125{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:10px}
.sim-lab-meta-v125{display:flex;gap:9px;align-items:center;flex-wrap:wrap;color:#697589;font-size:.75rem;font-weight:850;letter-spacing:.03em;text-transform:uppercase}
.sim-lab-meta-v125 .sim-pill-v125{display:inline-flex;align-items:center;padding:6px 9px;border-radius:999px;background:#edf2ff;color:#3558a5}
.sim-lab-v125.is-optional .sim-lab-meta-v125 .sim-pill-v125.optional{background:#fff0d4;color:#9a6510}
.sim-lab-v125 h4{margin:.15rem 0 .45rem;color:#17233b;font-size:1.08rem;line-height:1.4}
.sim-lab-v125 .sim-desc-v125{margin:0 0 12px;color:#566476;line-height:1.68}
.sim-credit-v125{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:0 0 14px;padding:10px 12px;border-radius:13px;background:#eef4ff;color:#566476;font-size:.78rem;line-height:1.5}
.sim-lab-v125.is-optional .sim-credit-v125{background:#fff3dc}
.sim-credit-v125 strong{color:#22385d}.sim-credit-v125 a{font-weight:850;color:#2d58ad;text-decoration:none}.sim-credit-v125 a:hover{text-decoration:underline}
.sim-player-v125{overflow:hidden;border:1px solid #d7dfeb;border-radius:18px;background:#101929;min-height:170px;box-shadow:0 9px 24px rgba(20,35,60,.10)}
.sim-player-placeholder-v125{min-height:170px;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-icon-v125{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-player-copy-v125 strong{display:block;font-size:1rem}.sim-player-copy-v125 p{margin:5px 0 0;color:#c5d0e2;font-size:.88rem;line-height:1.5}
.sim-load-v125{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-v125:hover{transform:translateY(-1px);box-shadow:0 7px 18px rgba(0,0,0,.18)}
.sim-player-v125 iframe{display:block;width:100%;height:clamp(520px,65vw,760px);border:0;background:#fff}
.sim-player-links-v125{display:flex;justify-content:flex-end;margin:8px 4px 16px}.sim-player-links-v125 a{font-size:.77rem;font-weight:850;color:#355fae;text-decoration:none}.sim-player-links-v125 a:hover{text-decoration:underline}
.sim-task-v125{margin-top:18px;padding:18px 19px;border:1px solid #e0e5ed;border-radius:18px;background:#fdfefe}
.sim-task-v125 .sim-task-kicker-v125{display:inline-flex;align-items:center;padding:6px 9px;border-radius:999px;background:#eaf1ff;color:#2b55aa;font-size:.66rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.sim-lab-v125.is-optional .sim-task-v125 .sim-task-kicker-v125{background:#fff0d4;color:#9a6510}
.sim-task-v125 h5{margin:.75rem 0 .45rem;color:#17233b;font-size:1rem;line-height:1.45}
.sim-task-v125 ol{margin:0;padding-left:1.35rem}.sim-task-v125 li{margin:.52rem 0;color:#334155;line-height:1.63}.sim-task-v125 li::marker{font-weight:900;color:#315bb1}
.sim-task-v125 .sim-question-v125{margin:14px 0;padding:12px 14px;border-left:4px solid #6f8edc;border-radius:0 12px 12px 0;background:#f2f6ff;color:#33445f;line-height:1.6}
.sim-lab-v125.is-optional .sim-task-v125 .sim-question-v125{background:#fff8ea;border-left-color:#d8a64d}
.sim-check-v125{margin-top:13px;border-top:1px solid #e5e9f0;padding-top:11px}.sim-check-v125 summary{cursor:pointer;color:#3159a6;font-weight:850;font-size:.86rem}.sim-lab-v125.is-optional .sim-check-v125 summary{color:#8a5d18}.sim-check-v125 p{margin:.65rem 0 0;color:#566477;line-height:1.65}
@media(max-width:760px){.sim-group-v125{margin:22px 0 32px;padding:18px;border-radius:20px}.sim-lab-v125{padding:16px;border-radius:18px}.sim-player-placeholder-v125{grid-template-columns:auto 1fr;padding:17px;min-height:185px}.sim-load-v125{grid-column:1/-1;width:100%;min-height:44px}.sim-player-v125 iframe{height:68vh;min-height:520px;max-height:720px}.sim-top-v125{flex-direction:column}.sim-player-links-v125{justify-content:flex-start}}
@media(max-width:430px){.sim-player-placeholder-v125{grid-template-columns:1fr;text-align:center}.sim-player-icon-v125{margin:auto}.sim-player-v125 iframe{height:72vh;min-height:500px}.sim-player-links-v125{justify-content:center}}