:root{--navy:#0B1F4B;--gold:#F2B01E;--bg:#F4F7FD;--green:#1E9E5A;--red:#D93F4C;--orange:#F26B0F}
*{box-sizing:border-box;font-family:'Almarai',sans-serif}
body{margin:0;background:var(--bg);color:var(--navy)}
.container{max-width:440px;margin:0 auto;background:#fff;box-shadow:0 4px 10px rgba(0,0,0,.1);min-height:100vh;display:flex;flex-direction:column}
header{background:var(--navy);color:#fff;text-align:center;padding:14px;border-bottom:4px solid var(--gold)}
header h1{margin:4px 0;font-size:1.1rem;color:var(--gold)}header h2{margin:4px 0;font-size:1.4rem}
.badge{display:inline-block;background:var(--gold);color:var(--navy);padding:4px 12px;border-radius:20px;font-size:.9rem;font-weight:700;margin-top:4px}
.objective{padding:12px 15px;background:#e8eef9;font-weight:700;text-align:center;font-size:.95rem}
.sim-area{padding:15px;text-align:center}
.btn-group{display:flex;justify-content:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
button{background:var(--navy);color:#fff;border:none;padding:10px 15px;border-radius:8px;font-size:1rem;font-weight:700;cursor:pointer;min-height:44px;min-width:44px}
button:hover{background:var(--orange)}button:disabled{opacity:.6;cursor:default}
.controls{margin-bottom:12px;background:var(--bg);padding:10px 12px;border-radius:8px;border:1px solid #d1dcf0;display:flex;flex-direction:column;gap:4px}
.control-group{display:flex;align-items:center;gap:8px}
.control-group label{font-weight:700;width:42%;text-align:right;font-size:.9rem}
.control-group input{flex:1;min-width:0;height:44px;accent-color:var(--orange)}
.equation{font-size:1.1rem;font-weight:700;margin-bottom:12px;background:#e8eef9;padding:8px;border-radius:8px}
.readouts{display:flex;gap:6px;margin-bottom:12px;flex-wrap:wrap}
.readout-box{flex:1 1 90px;background:var(--navy);color:#fff;padding:8px 4px;border-radius:8px;font-size:.8rem;font-weight:700}
.readout-box .v{color:var(--gold);font-size:1.15rem;display:block;margin-top:4px}
.visual{display:flex;flex-direction:column;align-items:center;gap:12px;margin-bottom:12px}
.visual canvas,.visual svg{max-width:100%;background:#fff;border:1px solid #cdd7ea;border-radius:6px}
.observations{padding:14px;background:#fff4e6;border-right:4px solid var(--orange);margin:0 15px 15px}
.observations h3{margin:0 0 8px;color:var(--orange);font-size:1.1rem}
.observations ul{margin:0;padding-right:20px;font-size:.95rem}.observations li{margin-bottom:5px}
.quiz{padding:15px;margin:0 15px 15px;background:#e8eff0;border-radius:8px;border:1px solid #c7dcdc}
.quiz h3{margin:0 0 10px}
.question-text{font-size:1rem;margin-bottom:12px;font-weight:700;line-height:1.6}
.options{display:flex;flex-direction:column;gap:8px}
.option-btn{background:#fff;color:var(--navy);border:2px solid var(--navy);text-align:right;display:flex;justify-content:space-between;font-family:'Readex Pro','Almarai',sans-serif}
.option-btn:hover{background:#fff4e6}
.option-btn.correct{background:var(--green);color:#fff;border-color:var(--green)}
.option-btn.wrong{background:var(--red);color:#fff;border-color:var(--red)}
.feedback{margin-top:12px;padding:10px;border-radius:8px;font-weight:700;display:none}
.feedback.show{display:block}.feedback.success{background:#d4edda;color:#155724}.feedback.error{background:#f8d7da;color:#721c24}
.quiz-controls{margin-top:12px;display:flex;gap:10px}
footer{background:var(--navy);color:#fff;text-align:center;padding:18px 15px;font-size:.85rem;margin-top:auto}
footer p{margin:0 0 12px;line-height:1.7}
.social-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}
.social-links a,.social-links span{color:var(--gold);text-decoration:none;background:rgba(255,255,255,.1);padding:6px 10px;border-radius:4px}
.ltr{direction:ltr;unicode-bidi:isolate;display:inline-block}