.matrix-input-grid.matrix-4x4 { grid-template-columns: repeat(4, 1fr); }
        .matrix-input-grid.matrix-5x5 { grid-template-columns: repeat(5, 1fr); }
        .matrix-input-grid input { width: 100%; padding: 0.3rem; text-align: center; font-size: 0.9rem; }
        .matrix-wrapper { display: flex; align-items: stretch; justify-content: center; gap: 0.2rem; margin: 0.5rem 0; }
        .matrix-bracket-left, .matrix-bracket-right { font-size: 3rem; font-weight: 200; color: #555; line-height: 1; display: flex; align-items: center; }
        .matrix-bracket-left { padding-right: 4px; }
        .matrix-bracket-right { padding-left: 4px; }
        .matrix-size-selector { display: flex; gap: 0.5rem; margin: 0.5rem 0; flex-wrap: wrap; }
        .matrix-size-btn { padding: 0.3rem 1.2rem; border: 2px solid #ccc; border-radius: 6px; background: white; font-weight: 500; cursor: pointer; transition: all 0.2s; }
        .matrix-size-btn.active { border-color: var(--primary-color); background: rgba(70,130,180,0.1); color: var(--primary-color); }
        .matrix-size-btn:hover { border-color: var(--primary-color); }
        .result-matrix { font-family: 'Courier New', monospace; font-size: 0.95rem; background: #f8f9fa; padding: 0.8rem 1.2rem; border-radius: 4px; display: inline-block; margin: 0.2rem 0; white-space: pre; line-height: 1.6; }
        .eigen-pair { background: #f8f9fa; border-radius: 6px; padding: 0.8rem 1.2rem; margin: 0.4rem 0; border-left: 3px solid var(--primary-color); }
        .eigen-pair .lambda { font-weight: 600; color: var(--accent-color); }
        .eigen-pair .mult { font-size: 0.9rem; color: #666; }
        .diagonalizable-yes { color: #198754; font-weight: 600; }
        .diagonalizable-no { color: #dc3545; font-weight: 600; }
        .deep-dive p { text-align: justify; }
        .toast { background: #28a745; color: white; padding: 0.8rem 1.2rem; border-radius: 6px; box-shadow: 0 4px 12px rgba(0,0,0,0.15); display: flex; align-items: center; gap: 0.6rem; animation: slideIn 0.3s ease; }
        @keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
        .toast i { font-size: 1.2rem; }
        .btn-outline-secondary:hover { background: #f1f1f1; }
        .accordion-item { border: 1px solid var(--border-color); }
        .accordion-button { background: white; }
        .accordion-button:not(.collapsed) { background: rgba(70,130,180,0.05); color: var(--accent-color); }
        .verification-pass { color: #198754; font-weight: 500; }
        .verification-fail { color: #dc3545; font-weight: 500; }
        .matrix-preview { font-family: 'Courier New', monospace; background: #f1f3f5; padding: 0.4rem 1rem; border-radius: 4px; display: inline-block; margin: 0.2rem 0; }
        .badge-matrix-size { background: #6c757d; color: white; padding: 0.2rem 0.6rem; border-radius: 12px; font-size: 0.75rem; }
		   .matrix-input-grid {
            display: grid;
            gap: 6px;
            max-width: 280px;
            margin: 0.5rem 0;
        }
        .matrix-input-grid.matrix-2x2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .matrix-input-grid.matrix-3x3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .matrix-input-grid input {
            width: 100%;
            padding: 0.4rem 0.3rem;
            text-align: center;
            font-family: 'Courier New', monospace;
            font-size: 1rem;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        .matrix-input-grid input:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(70, 130, 180, 0.2);
            outline: none;
        }
        .matrix-bracket {
            font-size: 2.2rem;
            font-weight: 300;
            color: #555;
            padding: 0 0.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .matrix-wrapper {
            display: flex;
            align-items: stretch;
            justify-content: center;
            gap: 0.2rem;
            margin: 0.5rem 0;
        }
        .matrix-bracket-left, .matrix-bracket-right {
            font-size: 3rem;
            font-weight: 200;
            color: #555;
            line-height: 1;
            display: flex;
            align-items: center;
        }
        .matrix-bracket-left { padding-right: 4px; }
        .matrix-bracket-right { padding-left: 4px; }
        .matrix-size-selector {
            display: flex;
            gap: 0.5rem;
            margin: 0.5rem 0;
            flex-wrap: wrap;
        }
        .matrix-size-btn {
            padding: 0.3rem 1.2rem;
            border: 2px solid #ccc;
            border-radius: 6px;
            background: white;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
        }
        .matrix-size-btn.active {
            border-color: var(--primary-color);
            background: rgba(70, 130, 180, 0.1);
            color: var(--primary-color);
        }
        .matrix-size-btn:hover {
            border-color: var(--primary-color);
        }
        .result-matrix {
            font-family: 'Courier New', monospace;
            font-size: 0.95rem;
            background: #f8f9fa;
            padding: 0.8rem 1.2rem;
            border-radius: 4px;
            display: inline-block;
            margin: 0.2rem 0;
            white-space: pre;
            line-height: 1.6;
        }
        .eigen-pair {
            background: #f8f9fa;
            border-radius: 6px;
            padding: 0.8rem 1.2rem;
            margin: 0.4rem 0;
            border-left: 3px solid var(--primary-color);
        }
        .eigen-pair .lambda {
            font-weight: 600;
            color: var(--accent-color);
        }
        .eigen-pair .mult {
            font-size: 0.9rem;
            color: #666;
        }
        .diagonalizable-yes {
            color: #198754;
            font-weight: 600;
        }
        .diagonalizable-no {
            color: #dc3545;
            font-weight: 600;
        }
        .deep-dive p {
            text-align: justify;
        }
        .legend-item {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            margin-right: 1rem;
        }
        .legend-color {
            width: 14px;
            height: 14px;
            border-radius: 3px;
        }
        .legend-color.eig { background: #dc3545; }
        .legend-color.diag { background: #0d6efd; }
        .legend-color.trans { background: #6c757d; }
        .accordion-item {
            border: 1px solid var(--border-color);
        }
        .accordion-button {
            background: white;
        }
        .accordion-button:not(.collapsed) {
            background: rgba(70, 130, 180, 0.05);
            color: var(--accent-color);
        }
        .verification-pass {
            color: #198754;
            font-weight: 500;
        }
        .verification-fail {
            color: #dc3545;
            font-weight: 500;
        }
        .badge-matrix-size {
            background: #6c757d;
            color: white;
            padding: 0.2rem 0.6rem;
            border-radius: 12px;
            font-size: 0.75rem;
        }
        .matrix-preview {
            font-family: 'Courier New', monospace;
            background: #f1f3f5;
            padding: 0.4rem 1rem;
            border-radius: 4px;
            display: inline-block;
            margin: 0.2rem 0;
        }
        .toast {
            background: #28a745;
            color: white;
            padding: 0.8rem 1.2rem;
            border-radius: 6px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            display: flex;
            align-items: center;
            gap: 0.6rem;
            animation: slideIn 0.3s ease;
        }
        @keyframes slideIn {
            from { transform: translateX(100%); opacity: 0; }
            to { transform: translateX(0); opacity: 1; }
        }
        .toast i { font-size: 1.2rem; }
        .btn-outline-secondary:hover {
            background: #f1f1f1;
        }