body{background-color:#f8f9fa;color:#212529;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;}.hero-section{background:linear-gradient(135deg,#e9ecef 0%,#dee2e6 100%);padding:4rem 0;margin-bottom:2rem;}.card{box-shadow:0 0.125rem 0.25rem rgba(0,0,0,0.075);transition:box-shadow 0.3s ease;border:none;margin-bottom:1.5rem;border-radius:0.5rem;}.card:hover{box-shadow:0 0.5rem 1rem rgba(0,0,0,0.15);}.simulation-container{background-color:#ffffff;border-radius:0.5rem;padding:1.5rem;margin-bottom:2rem;box-shadow:0 0.125rem 0.25rem rgba(0,0,0,0.075);}.control-panel{background-color:#e9ecef;border-radius:0.5rem;padding:1rem;margin-bottom:1.5rem;}.visualization-area{background-color:#ffffff;border:1px solid #dee2e6;border-radius:0.5rem;min-height:300px;display:flex;align-items:center;justify-content:center;margin-bottom:1.5rem;position:relative;overflow:hidden;}.badge-keyword{border-radius:50px;padding:0.5rem 1rem;font-size:0.875rem;margin:0.25rem;display:inline-flex;align-items:center;background-color:#f8f9fa;color:#495057;border:1px solid #dee2e6;transition:all 0.2s ease;}.badge-keyword:hover{background-color:#007bff;color:#ffffff;border-color:#007bff;transform:translateY(-2px);}.step-indicator{position:relative;padding-left:2rem;margin-bottom:1rem;}.step-indicator:before{content:"";position:absolute;left:0;top:0.5rem;width:1rem;height:1rem;border-radius:50%;background-color:#007bff;}.btn-primary{background-color:#007bff;border-color:#007bff;}.btn-outline-primary{color:#007bff;border-color:#007bff;}.btn-outline-primary:hover{background-color:#007bff;border-color:#007bff;color:#ffffff;}.gas-cylinder{position:relative;width:220px;height:320px;margin:0 auto;perspective:1000px;}.cylinder-body{position:absolute;width:100%;height:80%;bottom:0;background:linear-gradient(135deg,#e9ecef 0%,#dee2e6 100%);border:3px solid #adb5bd;border-radius:12px 12px 0 0;overflow:hidden;box-shadow:0 4px 8px rgba(0,0,0,0.1);}.cylinder-top{position:absolute;width:120%;height:25px;top:0;left:-10%;background:linear-gradient(135deg,#adb5bd,#868e96);border-radius:12px 12px 0 0;box-shadow:0 2px 4px rgba(0,0,0,0.1);}.piston{position:absolute;width:110%;height:25px;top:20%;left:-5%;background:linear-gradient(135deg,#495057,#343a40);border-radius:8px;cursor:grab;box-shadow:0 3px 6px rgba(0,0,0,0.2);transition:top 0.5s ease;}.piston:hover{background:linear-gradient(135deg,#343a40,#212529);transform:scale(1.02);}.gas-particles{position:absolute;width:100%;height:80%;bottom:0;display:flex;flex-wrap:wrap;align-content:flex-end;padding:15px;}.particle{width:8px;height:8px;background-color:#007bff;border-radius:50%;margin:2px;animation:float 3s infinite ease-in-out;box-shadow:0 0 4px rgba(0,123,255,0.5);}.particle.hot{background-color:#dc3545;animation-duration:1.5s;box-shadow:0 0 8px rgba(220,53,69,0.7);}.particle.cold{background-color:#17a2b8;animation-duration:4s;box-shadow:0 0 8px rgba(23,162,184,0.7);}.heat-source{position:absolute;bottom:-40px;left:50%;transform:translateX(-50%);width:150px;height:30px;background:linear-gradient(to top,#fd7e14,#ffc107);border-radius:5px;display:flex;align-items:center;justify-content:center;color:#212529;font-weight:bold;box-shadow:0 2px 5px rgba(0,0,0,0.2);}.work-arrow{position:absolute;top:50%;right:-60px;transform:translateY(-50%);display:flex;align-items:center;color:#28a745;font-weight:bold;}.arrow-line{width:40px;height:3px;background-color:#28a745;position:relative;}.arrow-head{width:0;height:0;border-top:6px solid transparent;border-bottom:6px solid transparent;border-left:10px solid #28a745;margin-left:-3px;}.energy-bar-container{width:100%;height:40px;background-color:#e9ecef;border-radius:20px;overflow:hidden;margin:15px 0;position:relative;box-shadow:inset 0 2px 4px rgba(0,0,0,0.1);}.energy-bar{height:100%;border-radius:20px;transition:all 0.5s ease;box-shadow:0 2px 4px rgba(0,0,0,0.1);}.energy-bar.positive{background:linear-gradient(135deg,#28a745,#20c997);}.energy-bar.negative{background:linear-gradient(135deg,#dc3545,#fd7e14);}.energy-value{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-weight:bold;color:#212529;text-shadow:0 0 3px rgba(255,255,255,0.9);font-size:0.9rem;}.process-diagram{display:flex;flex-direction:column;align-items:center;margin:20px 0;}.state-point{width:40px;height:40px;border-radius:50%;background-color:#007bff;display:flex;align-items:center;justify-content:center;color:white;font-weight:bold;margin:15px 0;position:relative;box-shadow:0 2px 5px rgba(0,0,0,0.2);transition:transform 0.3s ease;}.state-point:hover{transform:scale(1.1);background-color:#0056b3;}.state-label{position:absolute;top:45px;left:50%;transform:translateX(-50%);white-space:nowrap;font-weight:bold;}.process-line{width:4px;height:60px;background-color:#007bff;margin:0 auto;position:relative;}.process-line:after{content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);width:0;height:0;border-left:8px solid transparent;border-right:8px solid transparent;border-top:12px solid #007bff;}.process-label{margin:15px 0;font-weight:bold;color:#007bff;font-size:1.1rem;}.animation-controls{display:flex;justify-content:center;gap:20px;margin:25px 0;padding:15px;background:linear-gradient(to right,#f8f9fa,#e9ecef);border-radius:15px;box-shadow:inset 0 2px 4px rgba(0,0,0,0.05);}.animation-btn{padding:12px 25px;border:none;border-radius:50px;color:white;cursor:pointer;transition:all 0.4s cubic-bezier(0.175,0.885,0.32,1.275);box-shadow:0 6px 12px rgba(0,0,0,0.15);font-weight:600;font-size:1.1rem;position:relative;overflow:hidden;}.animation-btn:before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);transition:0.5s;}.animation-btn:hover:before{left:100%;}.animation-btn:hover{transform:translateY(-5px) scale(1.05);box-shadow:0 10px 20px rgba(0,0,0,0.25);}.animation-btn:active{transform:translateY(0) scale(0.98);}.animation-btn:disabled{background:linear-gradient(135deg,#6c757d,#5a6268);cursor:not-allowed;transform:none;box-shadow:none;opacity:0.7;}.btn-success{background:linear-gradient(135deg,#28a745,#1e7e34);}.btn-danger{background:linear-gradient(135deg,#dc3545,#bd2130);}@keyframes pulse{0%{transform:scale(1);}50%{transform:scale(1.05);}100%{transform:scale(1);}}@keyframes bounce{0%,100%{transform:translateY(0);}50%{transform:translateY(-5px);}}@keyframes flash{0%,100%{opacity:1;}50%{opacity:0.7;}}@keyframes float{0%,100%{transform:translateY(0);}50%{transform:translateY(-10px);}}@keyframes shake{0%,100%{transform:translateX(0);}25%{transform:translateX(-5px);}75%{transform:translateX(5px);}}@keyframes rotate{0%{transform:rotate(0deg);}100%{transform:rotate(360deg);}}.modal-content{border-radius:0.5rem;}.modal-header{background-color:#007bff;color:white;border-radius:0.5rem 0.5rem 0 0;}.process-notification{box-shadow:0 4px 12px rgba(0,0,0,0.15);border:none;}.process-notification.alert-info{background-color:#d1ecf1;border-color:#bee5eb;color:#0c5460;}.process-notification.alert-primary{background-color:#cce5ff;border-color:#b8daff;color:#004085;}.process-notification.alert-success{background-color:#d4edda;border-color:#c3e6cb;color:#155724;}.process-notification.alert-danger{background-color:#f8d7da;border-color:#f5c6cb;color:#721c24;}.application-card:hover{transform:translateY(-10px);box-shadow:0 10px 25px rgba(0,0,0,0.15);}.application-icon{transition:all 0.4s cubic-bezier(0.175,0.885,0.32,1.275);}.application-card:hover .application-icon{transform:scale(1.15) rotate(5deg);box-shadow:0 8px 20px rgba(0,0,0,0.2) !important;}.concept-card:hover{transform:translateY(-8px);box-shadow:0 12px 30px rgba(0,0,0,0.2) !important;}.concept-icon{transition:all 0.4s cubic-bezier(0.175,0.885,0.32,1.275);}.concept-card:hover .concept-icon{transform:scale(1.1) rotate(-5deg);box-shadow:0 10px 25px rgba(0,0,0,0.25) !important;}.concept-link:hover{transform:translateY(-2px) !important;box-shadow:0 4px 12px rgba(0,0,0,0.15) !important;}.badge{transition:all 0.3s ease;}.badge:hover{transform:scale(1.05);}@media (max-width:768px){.hero-section{padding:2rem 0;}.simulation-container{padding:1rem;}.badge-keyword{font-size:0.75rem;padding:0.25rem 0.75rem;}.gas-cylinder{width:150px;height:250px;}.work-arrow{top:auto;bottom:-50px;right:auto;left:50%;transform:translateX(-50%);}.work-arrow .arrow-line{width:3px;height:40px;}.work-arrow .arrow-head{border-top:10px solid #28a745;border-right:6px solid transparent;border-left:6px solid transparent;border-bottom:none;margin-left:0;margin-top:-3px;}.process-diagram{flex-direction:row;justify-content:space-around;}.state-point{margin:0 10px;}.process-line{width:50px;height:3px;}.state-label{top:auto;bottom:-25px;left:50%;transform:translateX(-50%);}.application-card:hover{transform:translateY(-5px);}.concept-card:hover{transform:translateY(-5px);}.application-icon,.concept-icon{width:70px;height:70px;font-size:2rem;}}*:focus{outline:2px solid #007bff;outline-offset:2px;}.skip-link{position:absolute;top:-40px;left:0;background:#007bff;color:white;padding:8px;text-decoration:none;z-index:1000;}.skip-link:focus{top:0;}@media print{.control-panel,.animation-controls,.btn{display:none;}.card{box-shadow:none;border:1px solid #dee2e6;}}