:root{--primary-color: #007bff;--secondary-color: #6c757d;--success-color: #28a745;--danger-color: #dc3545;--warning-color: #ffc107;--light-bg: #f8f9fa;--dark-text: #343a40;--font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif}*{box-sizing:border-box}body{margin:0;font-family:var(--font-family);font-size:16px;line-height:1.5;color:var(--dark-text);background-color:var(--light-bg);-webkit-font-smoothing:antialiased}h1,h2,h3{margin-top:0;color:#222}button,input,select,textarea{font-family:inherit;font-size:1rem}button{cursor:pointer;transition:opacity .2s}button:active{opacity:.8}.container{padding:15px;max-width:100%;margin:0 auto}.container{max-width:720px}.back-btn{background:none;border:none;font-size:2rem;font-weight:900;margin-right:15px;cursor:pointer;line-height:1;padding:0;color:var(--dark-text);display:inline-flex;align-items:center;justify-content:center}.back-btn:hover{opacity:.7}.page-header{display:flex;align-items:center;padding-bottom:15px}.page-header h1,.page-header h2{margin:0;flex:1}