:root{
            --main-color: #1A48EE;
            --secondary-color: #1547CC;
            --color-white: #FFFFFF;
            --color-light-bg: #F9FAFB;
            --color-light-border: #E5E7EB;
            --color-dark-text: #111827;
            --color-medium-text: #6B7280;
            --color-green-dark: #047857;
        }
        /* --- Grid & Layouts (from calculators.css) --- */
        .grid-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            margin-bottom: 2rem;
        }
        @media (min-width: 768px) { .grid-container { grid-template-columns: repeat(2, 1fr); } }
        
        /* --- Form Elements --- */
        label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--color-dark-text);
            margin-bottom: 0.25rem;
        }
        input[type="text"], input[type="number"], select {
            width: 100%;
            padding: 0.5rem 0.75rem;
            border: 1px solid var(--color-light-border);
            border-radius: 0.375rem;
            box-shadow: inset 0 1px 2px 0 rgba(0,0,0,0.05);
            font-size: 0.875rem;
        }
        input:focus, select:focus {
            outline: 2px solid transparent;
            outline-offset: 2px;
            border-color: var(--main-color);
            box-shadow: 0 0 0 2px rgba(26, 72, 238, 0.4);
        }
        .checkbox-group { display: flex; align-items: center; }
        .checkbox-group input { height: 1rem; width: 1rem; border-color: var(--color-light-border); }
        .checkbox-group label { margin-left: 0.75rem; margin-bottom: 0; }
        
        /* --- Buttons --- */
        .btn {
            display: inline-flex;
            justify-content: center;
            align-items: center;
            padding: 0.5rem 1.5rem;
            border: 1px solid transparent;
            font-size: 0.875rem;
            font-weight: 500;
            border-radius: 0.375rem;
            cursor: pointer;
            transition: background-color 0.2s;
        }
        .btn-primary {
            color: var(--color-white);
            background-color: var(--main-color);
        }
        .btn-primary:hover { background-color: var(--secondary-color); }

        /* --- Specific Component Styles --- */
        .instructions-details summary { display: flex; justify-content: space-between; align-items: center; cursor: pointer; list-style: none; }
        .instructions-details summary::-webkit-details-marker { display: none; }
        .instructions-details h2 { font-size: 1.25rem; font-weight: 600; }
        .instructions-details .arrow-down { transition: transform 0.2s; width: 1.5rem; height: 1.5rem; }
        .instructions-details[open] summary .arrow-down { transform: rotate(180deg); }
        .instructions-details .content { margin-top: 1rem; color: var(--color-medium-text); }
        .instructions-details .content p { margin-bottom: 0.5rem; }

        .tab-group { display: flex; border-radius: 0.375rem; box-shadow: 0 1px 2px 0 rgba(0,0,0,0.05); }
        .tab-button { flex: 1; padding: 0.5rem 1rem; font-size: 0.875rem; font-weight: 500; background-color: var(--color-white); border: 1px solid var(--color-light-border); cursor: pointer; transition: all 0.2s ease-in-out; }
        .tab-button:first-child { border-radius: 0.375rem 0 0 0.375rem; }
        .tab-button:last-child { border-radius: 0 0.375rem 0.375rem 0; }
        .tab-button.active { background-color: var(--main-color); color: white; border-color: var(--main-color); }
        
        .conversion-tool { display: flex; align-items: center; gap: 1rem; }
        .conversion-tool .flex-1 { flex: 1; }
        .conversion-tool .equals-sign { padding-top: 1.5rem; font-weight: bold; font-size: 1.25rem; }

        .gpa-display-card { color: var(--color-white); border-radius: 0.5rem; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1); padding: 1.5rem; display: flex; flex-direction: column; align-items: center; justify-content: center; }
        .gpa-display-card.cumulative { background-color: var(--main-color); }
        .gpa-display-card.major { background-color: var(--color-green-dark); }
        .gpa-display-card h3 { font-size: 1.125rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; color: white;}
        .gpa-display-card p { font-size: 3rem; font-weight: bold; margin-top: 0.5rem; }

        .course-form-grid { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }

        .course-list { display: flex; flex-direction: column; gap: 1rem; }
        .course-card { background-color: var(--color-white); padding: 1rem; border-radius: 0.5rem; box-shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1); display: flex; align-items: center; justify-content: space-between; }
        .course-card .info p:first-child { font-weight: 600; }
        .course-card .info p:last-child { font-size: 0.875rem; color: var(--color-medium-text); }
        .course-card .major-badge { background-color: var(--color-green-light); color: var(--color-green-dark); font-size: 0.75rem; font-weight: 500; margin-right: 0.5rem; padding: 0.25rem 0.625rem; border-radius: 9999px; }
        .delete-btn { color: var(--color-error); padding: 0.5rem; border-radius: 9999px; background: none; border: none; cursor: pointer; }
        .delete-btn:hover { background-color: #fee2e2; }

        .grade-weights-grid { margin-top: 1rem; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1rem; }

        .footer { text-align: center; margin-top: 3rem; }
        .footer p { color: var(--color-medium-text); font-size: 0.875rem; }
        .footer .disclaimer { font-size: 0.75rem; margin-top: 0.5rem; padding: 0 1rem; }