/* Numerical Methods Tool - Complete Styles with Light/Dark Theme Support */

/* ===== CSS Variables ===== */
.numerical-methods-container {
    --nm-primary: var(--primary-color, #3498db);
    --nm-secondary: var(--secondary-color, #2ecc71);
    --nm-bg: var(--card-bg-color, #fcfcfc);
    --nm-surface: var(--background-color, #ffffff);
    --nm-text: var(--text-color, #333333);
    --nm-text-muted: #6c757d;
    --nm-border: var(--border-color, rgba(52, 152, 219, 0.1));
    --nm-shadow: var(--box-shadow, 0 4px 6px rgba(0, 0, 0, 0.1));
    --nm-radius: var(--border-radius-md, 8px);
    --nm-radius-lg: var(--border-radius-lg, 16px);
    --nm-transition: var(--transition-fast, 0.2s ease);
    --nm-gradient: linear-gradient(135deg, var(--nm-primary), var(--nm-secondary));
    --nm-success: #27ae60;
    --nm-warning: #f39c12;
    --nm-danger: #e74c3c;
    --nm-info: #3498db;
    --nm-purple: #9b59b6;
    --nm-orange: #e67e22;
    --nm-teal: #1abc9c;
    --nm-canvas-bg: #f8f9fa;
    --nm-canvas-grid: rgba(0, 0, 0, 0.05);
}

.dark-theme .numerical-methods-container {
    --nm-text-muted: #9ca3af;
    --nm-surface: #1a1d24;
    --nm-bg: #242830;
    --nm-canvas-bg: #1a1d24;
    --nm-canvas-grid: rgba(255, 255, 255, 0.05);
}

/* ===== Base Container ===== */
.numerical-methods-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
    font-family: var(--font-family, 'Inter', sans-serif);
    color: var(--nm-text);
}

/* ===== Header ===== */
.nm-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--secondary-rgb), 0.05));
    border-radius: 16px;
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.nm-header .header-content {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nm-header .header-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    font-size: 1.75rem;
    color: white;
    box-shadow: 0 8px 24px rgba(var(--primary-rgb), 0.35);
}

.nm-header h2 {
    margin: 0 0 0.25rem 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--nm-text);
}

.nm-header p {
    margin: 0;
    opacity: 0.7;
    font-size: 0.9rem;
    color: var(--nm-text);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.numerical-methods-container .btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--card-background);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.numerical-methods-container .btn-icon:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(var(--primary-rgb), 0.05);
}

.numerical-methods-container .btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== Privacy Notice ===== */
.privacy-notice {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--nm-radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.1), rgba(52, 152, 219, 0.1));
    border: 1px solid rgba(39, 174, 96, 0.2);
    color: var(--nm-success);
}

.dark-theme .privacy-notice {
    background: rgba(39, 174, 96, 0.15);
}

/* ===== Main Tool Layout ===== */
.nm-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
}

@media (max-width: 1024px) {
    .nm-layout {
        grid-template-columns: 1fr;
    }
}

/* ===== Method Sidebar ===== */
.nm-sidebar {
    background: var(--nm-bg);
    border-radius: var(--nm-radius-lg);
    border: 1px solid var(--nm-border);
    padding: 1.25rem;
    height: fit-content;
    position: sticky;
    top: 100px;
}

@media (max-width: 1024px) {
    .nm-sidebar {
        position: static;
    }
}

.nm-sidebar h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--nm-text);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--nm-border);
}

.method-category {
    margin-bottom: 1rem;
}

.method-category h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 0.5rem;
    font-size: 0.85rem;
    color: var(--nm-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.method-list {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.method-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 0.85rem;
    border: none;
    background: transparent;
    color: var(--nm-text);
    border-radius: var(--nm-radius);
    cursor: pointer;
    font-size: 0.9rem;
    text-align: left;
    transition: var(--nm-transition);
}

.method-item:hover {
    background: rgba(var(--primary-rgb), 0.08);
    color: var(--nm-primary);
}

.method-item.active {
    background: var(--nm-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
}

.method-item i {
    width: 18px;
    text-align: center;
}

/* ===== Main Content ===== */
.nm-main {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ===== Tool Tabs ===== */
.nm-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--nm-bg);
    border-radius: var(--nm-radius);
    border: 1px solid var(--nm-border);
}

.nm-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
    border: none;
    background: transparent;
    color: var(--nm-text-muted);
    border-radius: var(--nm-radius);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--nm-transition);
}

.nm-tab:hover {
    background: var(--nm-surface);
    color: var(--nm-text);
}

.nm-tab.active {
    background: var(--nm-gradient);
    color: #fff;
    box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.3);
}

/* ===== Panels ===== */
.nm-panel {
    display: none;
    background: var(--nm-bg);
    border-radius: var(--nm-radius-lg);
    border: 1px solid var(--nm-border);
    padding: 1.5rem;
    animation: fadeIn 0.3s ease;
}

.nm-panel.active {
    display: block;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.panel-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 1.25rem;
    color: var(--nm-text);
}

.panel-description {
    margin: 0 0 1.5rem;
    color: var(--nm-text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== Input Grid ===== */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--nm-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-group label .hint {
    font-weight: 400;
    color: var(--nm-text-muted);
    font-size: 0.8rem;
}

.input-group input,
.input-group select,
.input-group textarea {
    padding: 0.75rem 1rem;
    border: 2px solid var(--nm-border);
    border-radius: var(--nm-radius);
    background: var(--nm-surface);
    color: var(--nm-text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--nm-transition);
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--nm-primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}

.input-group textarea {
    min-height: 100px;
    resize: vertical;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
}

.input-group input.function-input {
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
}

/* ===== Buttons ===== */
.numerical-methods-container .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--nm-radius);
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--nm-transition);
    text-decoration: none;
}

.numerical-methods-container .btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.numerical-methods-container .btn-primary {
    background: var(--nm-gradient);
    color: #fff !important;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.numerical-methods-container .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.numerical-methods-container .btn-outline {
    background: transparent;
    color: var(--nm-primary);
    border: 2px solid var(--nm-primary);
}

.numerical-methods-container .btn-outline:hover {
    background: var(--nm-primary);
    color: #fff;
}

.numerical-methods-container .btn-success {
    background: var(--nm-success);
    color: #fff;
}

.numerical-methods-container .btn-danger {
    background: var(--nm-danger);
    color: #fff;
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ===== Results Section ===== */
.results-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--nm-border);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-header h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 1.1rem;
    color: var(--nm-text);
}

.result-box {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--secondary-rgb), 0.05));
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    border-radius: var(--nm-radius);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.result-value {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.result-value .label {
    font-size: 0.9rem;
    color: var(--nm-text-muted);
}

.result-value .value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--nm-primary);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
}

.result-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 0.75rem;
}

.result-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--nm-text-muted);
}

.result-stat i {
    color: var(--nm-primary);
}

/* ===== Iteration Table ===== */
.iteration-table-container {
    overflow-x: auto;
    margin-bottom: 1rem;
    border-radius: var(--nm-radius);
    border: 1px solid var(--nm-border);
    max-height: 400px;
    overflow-y: auto;
}

.iteration-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.iteration-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

.iteration-table th {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15), rgba(var(--primary-rgb), 0.1));
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--nm-text);
    border-bottom: 2px solid var(--nm-primary);
    white-space: nowrap;
}

.iteration-table td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--nm-border);
    color: var(--nm-text);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.8rem;
}

.iteration-table tbody tr:hover {
    background: rgba(var(--primary-rgb), 0.05);
}

.iteration-table tbody tr.converged {
    background: rgba(39, 174, 96, 0.1);
}

.iteration-table .iteration-num {
    font-weight: 600;
    color: var(--nm-primary);
}

/* ===== Step-by-Step Explanation ===== */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.step-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    border: 1px solid var(--nm-border);
    transition: var(--nm-transition);
}

.step-item:hover {
    border-color: var(--nm-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.step-number {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--nm-gradient);
    color: #fff;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h5 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
    color: var(--nm-text);
}

.step-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--nm-text-muted);
    line-height: 1.5;
}

.step-content .math-formula {
    background: rgba(var(--primary-rgb), 0.08);
    padding: 0.5rem 0.75rem;
    border-radius: var(--nm-radius);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--nm-primary);
    display: inline-block;
}

/* ===== Canvas Graph ===== */
.graph-container {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--nm-canvas-bg);
    border-radius: var(--nm-radius);
    border: 1px solid var(--nm-border);
}

.graph-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.graph-header h4 {
    margin: 0;
    font-size: 1rem;
    color: var(--nm-text);
}

.graph-controls {
    display: flex;
    gap: 0.5rem;
}

.graph-canvas-wrapper {
    position: relative;
    width: 100%;
    height: 350px;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    overflow: hidden;
}

.graph-canvas {
    width: 100%;
    height: 100%;
}

.graph-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--nm-border);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--nm-text-muted);
}

.legend-color {
    width: 16px;
    height: 3px;
    border-radius: 2px;
}

/* ===== Matrix Input ===== */
.matrix-input-container {
    margin-bottom: 1.5rem;
}

.matrix-size-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

.size-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.size-control label {
    font-size: 0.85rem;
    color: var(--nm-text-muted);
}

.size-control input {
    width: 60px;
    padding: 0.5rem;
    border: 2px solid var(--nm-border);
    border-radius: var(--nm-radius);
    background: var(--nm-surface);
    color: var(--nm-text);
    text-align: center;
}

.matrix-grid {
    display: inline-grid;
    gap: 0.35rem;
    padding: 1rem;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    border: 2px solid var(--nm-border);
    position: relative;
}

.matrix-grid::before,
.matrix-grid::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 8px;
    border: 3px solid var(--nm-primary);
}

.matrix-grid::before {
    left: 0;
    border-right: none;
    border-radius: 4px 0 0 4px;
}

.matrix-grid::after {
    right: 0;
    border-left: none;
    border-radius: 0 4px 4px 0;
}

.matrix-cell {
    width: 60px;
    height: 40px;
    padding: 0.25rem;
    border: 1px solid var(--nm-border);
    border-radius: 4px;
    background: var(--nm-bg);
    color: var(--nm-text);
    text-align: center;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.9rem;
}

.matrix-cell:focus {
    border-color: var(--nm-primary);
    outline: none;
}

.matrix-equals {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--nm-text-muted);
    margin: 0 1rem;
}

.vector-grid {
    display: inline-flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 1rem;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    border: 2px solid var(--nm-border);
    position: relative;
}

.vector-grid::before,
.vector-grid::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 8px;
    border: 3px solid var(--nm-secondary);
}

.vector-grid::before {
    left: 0;
    border-right: none;
    border-radius: 4px 0 0 4px;
}

.vector-grid::after {
    right: 0;
    border-left: none;
    border-radius: 0 4px 4px 0;
}

/* ===== Interpolation Data Table ===== */
.data-points-table {
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.data-points-table th,
.data-points-table td {
    padding: 0.5rem;
    border: 1px solid var(--nm-border);
    text-align: center;
}

.data-points-table th {
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--nm-text);
    font-weight: 600;
}

.data-points-table input {
    width: 80px;
    padding: 0.5rem;
    border: 1px solid var(--nm-border);
    border-radius: 4px;
    background: var(--nm-bg);
    color: var(--nm-text);
    text-align: center;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
}

.add-point-btn {
    margin-top: 0.5rem;
}

/* ===== Error Analysis Cards ===== */
.error-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.error-card {
    padding: 1.25rem;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    border: 1px solid var(--nm-border);
    text-align: center;
    transition: var(--nm-transition);
}

.error-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--nm-shadow);
}

.error-card .icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--nm-gradient);
    border-radius: 12px;
    color: #fff;
    font-size: 1.25rem;
}

.error-card .value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--nm-primary);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    margin-bottom: 0.25rem;
}

.error-card .label {
    font-size: 0.85rem;
    color: var(--nm-text-muted);
}

/* ===== Method Comparison Table ===== */
.comparison-table-container {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    border: 1px solid var(--nm-border);
    text-align: left;
}

.comparison-table th {
    background: var(--nm-gradient);
    color: #fff;
    font-weight: 600;
}

.comparison-table tbody tr:hover {
    background: rgba(var(--primary-rgb), 0.05);
}

.comparison-table .speed-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.speed-badge.fast {
    background: rgba(39, 174, 96, 0.15);
    color: var(--nm-success);
}

.speed-badge.medium {
    background: rgba(243, 156, 18, 0.15);
    color: var(--nm-warning);
}

.speed-badge.slow {
    background: rgba(231, 76, 60, 0.15);
    color: var(--nm-danger);
}

/* ===== Convergence Status ===== */
.convergence-status {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: var(--nm-radius);
    margin-bottom: 1rem;
}

.convergence-status.converged {
    background: rgba(39, 174, 96, 0.1);
    border: 1px solid rgba(39, 174, 96, 0.3);
    color: var(--nm-success);
}

.convergence-status.diverged {
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
    color: var(--nm-danger);
}

.convergence-status.warning {
    background: rgba(243, 156, 18, 0.1);
    border: 1px solid rgba(243, 156, 18, 0.3);
    color: var(--nm-warning);
}

.convergence-status i {
    font-size: 1.25rem;
}

/* ===== Practice Mode ===== */
.practice-container {
    padding: 1.5rem;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    border: 2px solid var(--nm-border);
}

.practice-problem {
    margin-bottom: 1.5rem;
}

.practice-problem h4 {
    margin: 0 0 0.75rem;
    color: var(--nm-text);
}

.practice-problem .problem-text {
    font-size: 1.1rem;
    color: var(--nm-text);
    line-height: 1.6;
    padding: 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: var(--nm-radius);
}

.practice-answer {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.practice-answer input {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem 1rem;
    border: 2px solid var(--nm-border);
    border-radius: var(--nm-radius);
    background: var(--nm-bg);
    color: var(--nm-text);
    font-size: 1rem;
}

.practice-feedback {
    padding: 1rem;
    border-radius: var(--nm-radius);
    margin-top: 1rem;
}

.practice-feedback.correct {
    background: rgba(39, 174, 96, 0.1);
    border: 1px solid var(--nm-success);
    color: var(--nm-success);
}

.practice-feedback.incorrect {
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid var(--nm-danger);
    color: var(--nm-danger);
}

/* ===== Export Buttons ===== */
.export-section {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--nm-border);
    flex-wrap: wrap;
}

/* ===== Formula Display ===== */
.formula-display {
    padding: 1rem 1.25rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-left: 4px solid var(--nm-primary);
    border-radius: 0 var(--nm-radius) var(--nm-radius) 0;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.95rem;
    color: var(--nm-text);
    margin: 1rem 0;
    overflow-x: auto;
}

/* ===== Toggle Switches ===== */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nm-border);
    transition: 0.3s;
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: #fff;
    transition: 0.3s;
    border-radius: 50%;
}

.toggle-switch input:checked+.toggle-slider {
    background: var(--nm-primary);
}

.toggle-switch input:checked+.toggle-slider:before {
    transform: translateX(22px);
}

.toggle-label {
    font-size: 0.9rem;
    color: var(--nm-text);
}

/* ===== Difference Table ===== */
.difference-table-container {
    overflow-x: auto;
    margin: 1rem 0;
}

.difference-table {
    border-collapse: collapse;
    min-width: 100%;
}

.difference-table th,
.difference-table td {
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--nm-border);
    text-align: center;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.85rem;
}

.difference-table th {
    background: var(--nm-gradient);
    color: #fff;
}

.difference-table .level-0 {
    background: rgba(52, 152, 219, 0.05);
}

.difference-table .level-1 {
    background: rgba(46, 204, 113, 0.05);
}

.difference-table .level-2 {
    background: rgba(155, 89, 182, 0.05);
}

.difference-table .level-3 {
    background: rgba(230, 126, 34, 0.05);
}

/* ===== Integration Visualization ===== */
.integration-visual {
    margin: 1.5rem 0;
}

.area-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.area-item {
    padding: 0.75rem 1rem;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    border: 1px solid var(--nm-border);
}

.area-item .interval {
    font-size: 0.8rem;
    color: var(--nm-text-muted);
    margin-bottom: 0.25rem;
}

.area-item .area-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--nm-primary);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
}

/* ===== Loading/Processing State ===== */
.nm-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--nm-text-muted);
}

.nm-loading .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--nm-border);
    border-top-color: var(--nm-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===== Quick Examples ===== */
.quick-examples {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--nm-surface);
    border-radius: var(--nm-radius);
    border: 1px solid var(--nm-border);
}

.quick-examples h5 {
    margin: 0 0 0.75rem;
    font-size: 0.9rem;
    color: var(--nm-text);
}

.example-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.example-btn {
    padding: 0.5rem 0.75rem;
    background: rgba(var(--primary-rgb), 0.1);
    border: none;
    border-radius: var(--nm-radius);
    color: var(--nm-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--nm-transition);
}

.example-btn:hover {
    background: var(--nm-primary);
    color: #fff;
}

/* ===== Tooltip ===== */
.nm-tooltip {
    position: relative;
    cursor: help;
}

.nm-tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 0.75rem;
    background: var(--nm-text);
    color: var(--nm-bg);
    font-size: 0.8rem;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--nm-transition);
    z-index: 100;
}

.nm-tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .numerical-methods-container {
        padding: 1rem;
    }

    .nm-header {
        padding: 1rem;
    }

    .nm-header .header-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    .nm-header h2 {
        font-size: 1.25rem;
    }

    .nm-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }

    .nm-tab {
        white-space: nowrap;
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .input-grid {
        grid-template-columns: 1fr;
    }

    .matrix-cell {
        width: 50px;
        height: 35px;
        font-size: 0.8rem;
    }

    .result-value .value {
        font-size: 1.4rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .graph-canvas-wrapper {
        height: 250px;
    }

    .error-cards {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .nm-sidebar {
        padding: 1rem;
    }

    .method-item {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .error-cards {
        grid-template-columns: 1fr;
    }

    .iteration-table {
        font-size: 0.75rem;
    }

    .iteration-table td {
        padding: 0.5rem;
    }
}

/* ===== Print Styles ===== */
@media print {
    .numerical-methods-container {
        padding: 0;
    }

    .nm-sidebar,
    .header-actions,
    .action-buttons,
    .export-section {
        display: none;
    }

    .nm-layout {
        display: block;
    }

    .nm-panel {
        display: block !important;
        page-break-inside: avoid;
    }

    .graph-container {
        page-break-inside: avoid;
    }
}