.container {
            max-width: 800px;
            margin: auto;
            background-color: #fff;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
        }
        h1 {
            color: #1a237e;
            text-align: center;
            font-weight: 700;
        }
        .section {
            margin-top: 2rem;
            padding-top: 1.5rem;
           
        }
        h2 {
            color: #3f51b5;
            font-size: 1.5rem;
            border-bottom: 2px solid #e8eaf6;
            padding-bottom: 0.5rem;
            margin-bottom: 1rem;
        }
        p {
            font-size: 1rem;
            color: #555;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #4a4a4a;
        }
        input[type="time"], select, input[type="range"], input[type="number"] {
            width: 100%;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-size: 1rem;
            box-sizing: border-box;
        }
        .btn-calculate {
            display: block;
            width: 100%;
            padding: 12px;
            background-color: #4caf50;
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.1s ease;
        }
        .btn-calculate:hover {
            background-color: #43a047;
            transform: translateY(-2px);
        }
        .btn-delete {
            padding: 8px 16px;
            background-color: #f44336;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            margin-top: 10px;
            font-size: 0.9rem;
            transition: background-color 0.3s ease;
        }
        .btn-delete:hover {
            background-color: #d32f2f;
        }
        .result-box {
            background-color: #e8f5e9;
            border-left: 4px solid #4caf50;
            padding: 1rem;
            border-radius: 8px;
            margin-top: 1rem;
        }
        .chart-container {
            position: relative;
            height: 250px;
            width: 100%;
            margin: auto;
        }
        .loading {
            text-align: center;
            padding: 20px;
            font-style: italic;
            color: #666;
        }