:root{color:#e9f2f7;background:#0b1118;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{background:#0b1118;min-width:320px;margin:0}button,input,select{font:inherit}button{cursor:pointer}button:disabled,input:disabled,select:disabled{cursor:not-allowed;opacity:.45}#ammo-terrain-app{min-height:100vh;position:relative;overflow:hidden}#scene-shell{position:fixed;inset:0}#scene-shell canvas{width:100%;height:100%;display:block}.study-hud{z-index:1;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#081119db;border:1px solid #b9d8e62e;border-radius:18px;width:min(430px,100vw - 32px);margin:18px;padding:18px;position:relative;box-shadow:0 18px 70px #00000042}.back-link{color:#a9d9e9;font-size:12px;text-decoration:none}.eyebrow{color:#8cbfd1;letter-spacing:.16em;margin-top:19px;font-size:10px}h1{letter-spacing:-.055em;margin:8px 0 10px;font-size:clamp(28px,5vw,42px);line-height:.98}.intro,.hint{color:#a7bac4;font-size:12px;line-height:1.55}code{color:#d2f3ff;font-size:.92em}.status-panel,.control-card,.contract-card{background:#0f1e2ac2;border:1px solid #b9d8e621;border-radius:12px;margin-top:14px;padding:13px}.status-line,.card-heading,.contract-row,.capability-row,.select-row,.range-row{justify-content:space-between;align-items:center;gap:10px;display:flex}.status-pill,.backend-pill{align-items:center;gap:7px;font-size:11px;display:inline-flex}.status-pill i{background:#77e1b3;border-radius:50%;width:7px;height:7px;display:inline-block;box-shadow:0 0 12px #77e1b3}.backend-pill{color:#8cbfd1}.status-detail,.card-detail{color:#8da4af;margin:9px 0 0;font-size:11px;line-height:1.45}.metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px 14px;margin:13px 0 0;display:grid}.metrics div{border-top:1px solid #b9d8e61c;justify-content:space-between;gap:6px;padding-top:6px;display:flex}.metrics dt{color:#7e9aa7;text-transform:uppercase;letter-spacing:.07em;font-size:10px}.metrics dd{color:#e7f6fa;text-align:right;margin:0;font-size:11px}.card-heading{color:#d7edf2;margin-bottom:10px;font-size:12px}.card-heading span{color:#7c9aa8;font-size:10px}.select-row,.range-row{color:#a9bec7;margin:8px 0;font-size:11px}.select-row select{color:#e7f6fa;background:#142633;border:1px solid #355061;border-radius:6px;width:155px;padding:5px 7px}.range-row output{color:#e7f6fa}.range-row input{accent-color:#71d6ca;width:165px}.button-row{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin-top:8px;display:grid}.secondary-row{grid-template-columns:1fr}button{color:#dceef2;background:#16303d;border:1px solid #315261;border-radius:7px;padding:7px 6px;font-size:10px}button:hover:not(:disabled){background:#204758;border-color:#6db9c9}.check-row{color:#9db3bc;align-items:center;gap:8px;margin-top:10px;font-size:11px;display:flex}.check-row input{accent-color:#71d6ca}.contract-row{color:#8da4af;border-bottom:1px solid #b9d8e614;padding:6px 0;font-size:10px}.contract-row:last-of-type{border-bottom:0}.contract-row code{color:#cce9f0}.error-panel{color:#ffc2c2;background:#5f1923a6;border:1px solid #bd6a6a;border-radius:10px;gap:4px;margin-top:14px;padding:11px;font-size:11px;display:grid}.signature{color:#688591;letter-spacing:.18em;margin-top:16px;font-size:9px}@media (width<=700px){.study-hud{margin:10px;padding:14px}.intro{max-width:37ch}}