/* --- main.css content --- */
        :root {
            --main-color: #1A48EE;
            --secondary-color: #008AFF;
            --tertiary-color: #2c20E6;
            --secondary-background: #f9f9f9;
            --main-background: #e5f3ff;
            --tertiary-background: #e6e5ea;
            --color-white: #ffffff;
            --color-error-dark: #c53030;
            --color-green: #16a34a;
            --color-green-dark: #047857;
            --color-light-green: #D1FAE5;
            --color-contrast-green: #065F46;
            --border-color: #e2e8f0;
            --color-gray: #4a5568;
            --color-light-gray: #ccc;
            --color-very-light-gray: #e0e0e0;
        }

        * {
            box-sizing: border-box;
        }

        .wrapper {
             padding: 2rem 1rem;
        }

        h1 {
            width: 100%;
            display: inline-block;
            text-align: center;
            margin-top: 0px;
            color: #1a202c;
            font-size: 2.25rem;
            font-weight: bold;
        }
        
        h2 {
            font-size: 1.5rem;
            font-weight: bold;
            color: #1a202c;
            text-align: center;
            margin-bottom: 1rem;
        }

        p {
            margin-top: 0;
            margin-bottom: 16px;
            color: var(--color-gray);
        }

        .articlecontainer {
            margin: auto;
            max-width: 800px;
            width: 100%;
        }

        .hidden {
            display: none;
        }

        /* --- calculators.css content --- */
        .card {
            background-color: var(--color-white);
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            padding: 2rem;
            margin-bottom: 2rem;
        }

        .grid-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            align-items: end;
        }

        @media (min-width: 768px) {
            .grid-container {
                grid-template-columns: repeat(2, 1fr);
            }
             .grid-container-3-col {
                 grid-template-columns: repeat(3, 1fr);
             }
            .grid-span-full {
                grid-column: 1 / -1;
            }
        }
        
        @media (min-width: 1024px) {
             .grid-container-5-col {
                 grid-template-columns: repeat(5, 1fr);
             }
        }

        label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--color-gray);
            margin-bottom: 0.25rem;
        }

        input[type="number"],
        input[type="date"],
        select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #cbd5e0;
            border-radius: 0.5rem;
            box-shadow: inset 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            font-size: 1rem;
            transition: border-color 0.2s, box-shadow 0.2s;
            background-color: var(--color-white);
        }

        input:focus, select:focus {
            outline: none;
            border-color: var(--main-color);
            box-shadow: 0 0 0 3px rgba(26, 72, 238, 0.3);
        }

        .button-container {
            display: flex;
            justify-content: center;
            margin-top: 1rem;
        }

        .btn-primary {
            width: 100%;
            background-color: var(--main-color);
            color: var(--color-white);
            font-weight: bold;
            padding: 0.875rem 2rem;
            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 0.2s;
            cursor: pointer;
            font-size: 1rem;
        }
        
        .btn-primary:hover {
            background-color: var(--tertiary-color);
            transform: translateY(-2px);
        }

        #results {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-color);
        }

        .results-summary-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1rem;
        }
        @media (min-width: 768px) {
            .results-summary-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        .summary-card {
            padding: 1.5rem;
            border-radius: 0.75rem;
            text-align: center;
        }
        .summary-card h3 {
            font-size: 0.875rem;
            font-weight: 600;
            text-transform: uppercase;
            margin: 0 0 0.25rem 0;
        }
        .summary-card p {
            font-size: 2rem;
            font-weight: 700;
            margin: 0;
            line-height: 1.2;
        }
        
        .summary-card.theme-blue { background-color: #eff6ff; color: #1e40af; }
        .summary-card.theme-red { background-color: #fef2f2; color: #991b1b; }
        .summary-card.theme-green { background-color: #f0fdf4; color: #15803d; }
        .summary-card.theme-purple { background-color: #faf5ff; color: #6b21a8; }
        .summary-card.theme-yellow { background-color: #fefce8; color: #a16207; }

        .error-message {
            text-align: center;
            background-color: #fef2f2;
            color: var(--color-error-dark);
            font-weight: bold;
            padding: 1rem;
            border: 1px solid #fecaca;
            border-left: 5px solid var(--color-error-dark);
            border-radius: 8px;
        }

        .amortization-table-container {
            max-height: 400px;
            overflow-y: auto;
            border: 1px solid var(--border-color);
            border-radius: 0.5rem;
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
        }
        
        .amortization-table-container::-webkit-scrollbar { width: 8px; }
        .amortization-table-container::-webkit-scrollbar-track { background: #f1f5f9; }
        .amortization-table-container::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 4px; }
        .amortization-table-container::-webkit-scrollbar-thumb:hover { background: #64748b; }

        .amortization-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .amortization-table th,
        .amortization-table td {
            padding: 0.75rem 1rem;
            border-bottom: 1px solid var(--border-color);
        }
        
        .amortization-table td { color: #334155; }
        .amortization-table tbody tr:last-child td { border-bottom: none; }
        .amortization-table tbody tr:hover { background-color: #f8fafc; }


        .amortization-table thead {
            background-color: #f1f5f9;
            position: sticky;
            top: 0;
            z-index: 10;
        }
        .amortization-table th {
            font-size: 0.75rem;
            font-weight: 600;
            color: #475569;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        
        .text-right { text-align: right; }
        .interest-paid { color: #dc2626; }
        .principal-paid { color: #16a34a; }
        .balance-remaining { font-weight: 600; color: #1e293b;}

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-in {
            animation: fadeIn 0.5s ease-out forwards;
        }
        
        .instructions {
            background-color: var(--color-white);
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
            margin-bottom: 1.5rem;
        }
        .instructions h3, .faq-section h3 {
             margin-top: 0;
             margin-bottom: 0.5em;
             font-size: 1.125rem;
             color: #1e293b;
        }
         .instructions ul {
            list-style-position: inside;
            padding-left: 0;
            list-style-type: disc;
            margin-left: 1rem;
        }
         .instructions li {
            margin-bottom: 0.5em;
        }
        
         .ad-container {
            width: 100%;
            margin: 2rem auto;
            text-align: center;
            min-height: 90px;
        }