.container {
            max-width: 960px;
            margin: auto;
        }

        h1 {
            font-size: 2.25rem;
            text-align: center;
            margin-bottom: 2rem;
        }

        h2 {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 1rem;
            border-bottom: 1px solid #e2e8f0;
            padding-bottom: 0.5rem;
        }
        
        h3 {
            font-size: 1.125rem;
        }
        
        h4 {
            font-weight: 600;
            margin-top: 1rem;
            color: #2d3748;
        }

        p {
            margin-bottom: 1rem;
        }
        
        a {
            color: var(--main-color);
            text-decoration: none;
        }
        
        a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }

        /* Layout */
        .main-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 768px) {
            .main-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        .card {
            background-color: var(--color-white);
            border-radius: 8px;
            border: 1px solid #e2e8f0;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
            padding: 2rem;
        }

        /* Form & Inputs */
        .input-group {
            margin-bottom: 1rem;
        }

        label {
            display: block;
            font-size: 0.875rem;
            font-weight: bold;
            color: #4a5568;
            margin-bottom: 0.25rem;
        }
        
        input[type="number"] {
            width: 100%;
            padding: 0.5rem 0.75rem;
            border: 1px solid #cbd5e0;
            border-radius: 0.375rem;
            box-shadow: inset 0 1px 2px 0 rgba(0,0,0,0.05);
            font-size: 1rem;
        }
        
        input:focus {
            outline: none;
            border-color: var(--main-color);
            box-shadow: 0 0 0 3px rgba(26, 72, 238, 0.4);
        }

        /* Prize Tier Rows */
        .prize-tier-grid {
            display: grid;
            grid-template-columns: 1fr 1fr auto;
            gap: 1rem;
            align-items: center;
            padding: 0.5rem;
            border: 1px solid #e2e8f0;
            border-radius: 0.375rem;
            background-color: #f9fafb;
            margin-top: 1rem;
        }
        
        .prize-tier-grid input {
            font-size: 0.875rem;
            padding: 0.25rem 0.5rem;
        }
        
        .prize-tier-grid label {
            font-weight: normal;
            font-size: 0.75rem;
        }

        /* Buttons */
        .button-container {
            display: flex;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        
        .button {
            width: 100%;
            font-weight: bold;
            padding: 0.75rem 1rem;
            border: none;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
            transition: background-color 0.3s, transform 0.3s;
            cursor: pointer;
            font-size: 1rem;
            color: var(--color-white);
        }
        
        .button:hover {
            transform: scale(1.05);
        }
        
        #addTier {
            background-color: var(--main-color);
        }

        #addTier:hover {
            background-color: var(--secondary-color);
        }

        #calculate {
            background-color: var(--color-green-dark);
        }

        #calculate:hover {
            background-color:var(--color-green);
        }

        #loadMegaMillions {
            background-color: #F6AD55;
            color: #1a202c; /* Updated for better contrast */
            margin-top: 1rem;
            width: 100%;
            display: block;
        }
        
        #loadMegaMillions:hover {
            background-color: #ED8936;
        }

        .removeTierBtn {
            background-color: var(--color-error-dark);
            color: var(--color-white);
            font-weight: bold;
            padding: 0.25rem 0.5rem;
            font-size: 0.875rem;
            border: none;
            border-radius: 0.25rem;
            cursor: pointer;
        }
        
        .removeTierBtn:hover {
            background-color: var(--color-error-dark);
        }

        /* Results & Messages */
        #results {
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid #e2e8f0;
        }

        .hidden {
            display: none;
        }

        .result-amount {
            font-family: monospace;
            font-size: 1.125rem;
        }

        .result-message-pos {
            color: var(--color-green-dark);
        }

        .result-message-neg {
            color: var(--color-error-dark);
        }
        
        .error-message {
            text-align: center;
             color: var(--color-error-dark);
            font-weight: bold;
            background-color: #fcebeb;
            border: 1px solid var(--color-error-dark);
            padding: 1rem;
            border-radius: 0.5rem;
            margin-top: 1rem;
        }