#app .top-section{height:200px;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;text-align:center}#app .top-section h1{margin:0 0 10px 0;font-size:28px;font-weight:700}#app .top-section p{margin:0;font-size:16px;opacity:.9}#app .top-section .threshold-control{margin-top:15px;display:flex;align-items:center;gap:10px}#app .top-section .threshold-control label{font-size:14px;font-weight:500}#app .top-section .threshold-control select{padding:5px 10px;border:1px solid hsla(0,0%,100%,.3);border-radius:4px;background:hsla(0,0%,100%,.1);color:#fff;font-size:14px}#app .top-section .threshold-control select:focus{outline:none;border-color:hsla(0,0%,100%,.5)}#app .top-section .threshold-control select option{background:#333;color:#fff}#app .content{min-height:400px;padding:30px;margin:10px;background:#f8f9fa;border-radius:8px;box-shadow:0 2px 4px rgba(0,0,0,.1)}#app .content h2{color:#333;margin-bottom:15px}#app .content p{color:#666;line-height:1.6}