/* Linear Solver - Component Styles */

:root {
    --ls-tool: #6366f1;
    --ls-tool-dark: #4f46e5;
    --ls-gradient: linear-gradient(135deg, #6366f1 0%, #818cf8 100%);
    --ls-light: #eef2ff;
}
[data-theme="dark"] {
    --ls-light: rgba(99, 102, 241, 0.15);
}

/* ===== Input Mode Toggle ===== */
.ls-input-mode-toggle {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
    margin-bottom: 1rem;
}
.ls-input-mode-btn {
    flex: 1;
    padding: 0.5rem;
    font-weight: 600;
    font-size: 0.75rem;
    border: none;
    cursor: pointer;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: all 0.15s;
    font-family: var(--font-sans);
    text-align: center;
}
.ls-input-mode-btn.active {
    background: var(--ls-gradient);
    color: #fff;
}
.ls-input-mode-btn:hover:not(.active) {
    background: var(--bg-tertiary);
}
[data-theme="dark"] .ls-input-mode-btn { background: var(--bg-tertiary); }
[data-theme="dark"] .ls-input-mode-btn.active { background: var(--ls-gradient); color: #fff; }

/* ===== Dimension Inputs ===== */
.ls-dim-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}
.ls-dim-input {
    width: 60px;
    padding: 0.4rem 0.5rem;
    text-align: center;
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-mono);
    background: var(--bg-primary);
    color: var(--text-primary);
}
.ls-dim-input:focus {
    outline: none;
    border-color: var(--ls-tool);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}
.ls-dim-x {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== Grid Input ===== */
.ls-grid-header {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 0.25rem;
    padding: 0 0.25rem;
}
.ls-grid-label {
    width: 54px;
    text-align: center;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--ls-tool);
    font-family: var(--font-mono);
}
.ls-grid-divider-label {
    width: 16px;
    text-align: center;
    font-weight: 700;
    color: var(--ls-tool);
}
.ls-grid-row {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 0.25rem;
    align-items: center;
}
.ls-grid-cell {
    width: 54px;
    height: 36px;
    text-align: center;
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: var(--font-mono);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.15s;
}
.ls-grid-cell:focus {
    outline: none;
    border-color: var(--ls-tool);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}
.ls-grid-divider {
    width: 16px;
    text-align: center;
    font-weight: 700;
    color: var(--ls-tool);
    font-size: 1rem;
}
.ls-grid-b {
    border-color: var(--ls-tool);
    background: var(--ls-light);
}
[data-theme="dark"] .ls-grid-cell {
    background: var(--bg-tertiary);
    border-color: var(--border);
}
[data-theme="dark"] .ls-grid-b {
    background: rgba(99, 102, 241, 0.15);
}

/* ===== Method Selector ===== */
.ls-method-select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
}
[data-theme="dark"] .ls-method-select {
    background: var(--bg-tertiary);
    border-color: var(--border);
}

/* ===== Output Tabs ===== */
.ls-output-tabs {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
}
.ls-output-tab {
    flex: 1;
    padding: 0.5rem;
    font-weight: 600;
    font-size: 0.8125rem;
    border: none;
    cursor: pointer;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: all 0.15s;
    font-family: var(--font-sans);
    text-align: center;
}
.ls-output-tab.active {
    background: var(--ls-gradient);
    color: #fff;
}
.ls-output-tab:hover:not(.active) {
    background: var(--bg-tertiary);
}
[data-theme="dark"] .ls-output-tab { background: var(--bg-tertiary); }
[data-theme="dark"] .ls-output-tab.active { background: var(--ls-gradient); color: #fff; }

.ls-panel { display: none; flex: 1; min-height: 0; }
.ls-panel.active { display: flex; flex-direction: column; }
#ls-panel-result .tool-result-card { flex: 1; }
#ls-panel-graph { min-height: 480px; }
#ls-panel-python { min-height: 540px; }

/* ===== Result Display ===== */
.ls-result-section {
    padding: 1.25rem;
}
.ls-result-badge {
    display: inline-block;
    padding: 0.3rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.ls-badge-success { background: #dcfce7; color: #166534; }
.ls-badge-warning { background: #fef3c7; color: #92400e; }
.ls-badge-info { background: var(--ls-light); color: var(--ls-tool); }
[data-theme="dark"] .ls-badge-success { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }
[data-theme="dark"] .ls-badge-warning { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }

.ls-result-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}
.ls-result-math {
    max-width: 100%;
    padding: 0.75rem 0;
    text-align: center;
    overflow-x: auto;
}
.ls-result-math .katex-display { margin: 0; overflow-x: auto; overflow-y: hidden; }
.ls-result-detail {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    margin-top: 0.75rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}
[data-theme="dark"] .ls-result-detail {
    background: var(--bg-tertiary);
}
.ls-method-info {
    margin-top: 0.75rem;
}
.ls-method-badge {
    display: inline-block;
    background: var(--ls-light);
    color: var(--ls-tool);
    padding: 0.2rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.6875rem;
    font-weight: 600;
}
.ls-poly-var {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0.25rem 0;
}
.ls-error {
    background: #fef3c7;
    border: 1px solid #fbbf24;
    border-radius: 0.5rem;
    padding: 1.25rem;
    color: #92400e;
}
.ls-error h4 { margin: 0 0 0.5rem; font-size: 0.9375rem; }
.ls-error p { margin: 0; font-size: 0.8125rem; }
[data-theme="dark"] .ls-error {
    background: rgba(251, 191, 36, 0.15);
    border-color: rgba(251, 191, 36, 0.3);
    color: #fbbf24;
}
.ls-error-msg {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}
.ls-error-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0.5rem 0 0;
}

/* ===== Steps ===== */
.ls-steps-wrapper {
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
}
.ls-steps-header {
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
[data-theme="dark"] .ls-steps-header {
    background: var(--bg-tertiary);
}
.ls-step {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    align-items: flex-start;
}
.ls-step:last-child { border-bottom: none; }
.ls-step-number {
    min-width: 24px;
    height: 24px;
    background: var(--ls-tool);
    color: #fff;
    border-radius: 50%;
    font-size: 0.6875rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}
.ls-step-content {
    flex: 1;
    min-width: 0;
}
.ls-step-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    line-height: 1.5;
}
.ls-step-math {
    overflow-x: auto;
    padding: 0.25rem 0;
}
.ls-step-math .katex-display { margin: 0; overflow-x: auto; overflow-y: hidden; }

/* ===== Verification ===== */
.ls-verification {
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    margin-top: 1rem;
}
.ls-verify-pass { border-left: 3px solid #10b981; }
.ls-verify-warn { border-left: 3px solid #f59e0b; }
.ls-verify-header {
    padding: 0.625rem 1rem;
    font-weight: 600;
    font-size: 0.8125rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}
.ls-verify-row {
    padding: 0.375rem 1rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* ===== Example Chips ===== */
.ls-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}
.ls-example-chip {
    padding: 0.3rem 0.625rem;
    font-size: 0.6875rem;
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.15s;
    color: var(--text-secondary);
    white-space: nowrap;
    font-weight: 500;
}
.ls-example-chip:hover {
    background: var(--ls-tool);
    color: #fff;
    border-color: var(--ls-tool);
}
[data-theme="dark"] .ls-example-chip {
    background: var(--bg-tertiary);
}

/* ===== Graph ===== */
#ls-graph-container {
    width: 100%;
    min-height: 440px;
    border-radius: var(--radius-md);
}
.js-plotly-plot .plotly .modebar { top: 4px !important; right: 4px !important; }

/* ===== Educational Content ===== */
.ls-edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.ls-edu-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.25rem;
}
.ls-edu-card h4 {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}
.ls-edu-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}
[data-theme="dark"] .ls-edu-card {
    background: var(--bg-tertiary);
}

/* ===== Methods Table ===== */
.ls-methods-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    margin-top: 0.75rem;
}
.ls-methods-table th, .ls-methods-table td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.ls-methods-table th {
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-secondary);
}
.ls-methods-table td {
    color: var(--text-secondary);
}
[data-theme="dark"] .ls-methods-table th {
    background: var(--bg-tertiary);
}

/* ===== FAQ ===== */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: none; }
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.875rem 0;
    background: none;
    border: none;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    font-family: var(--font-sans);
    gap: 0.75rem;
}
.faq-answer {
    display: none;
    padding: 0 0 0.875rem;
    font-size: 0.8125rem;
    line-height: 1.7;
    color: var(--text-secondary);
}
.faq-item.open .faq-answer { display: block; }
.faq-chevron { transition: transform 0.2s; flex-shrink: 0; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }

/* ===== Educational Animations ===== */

/* Scroll-triggered fade-in-up */
@keyframes ls-fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.ls-anim { opacity: 0; }
.ls-anim.ls-visible { animation: ls-fadeInUp 0.5s ease-out forwards; }
.ls-anim.ls-visible.ls-anim-d1 { animation-delay: 0.1s; }
.ls-anim.ls-visible.ls-anim-d2 { animation-delay: 0.2s; }
.ls-anim.ls-visible.ls-anim-d3 { animation-delay: 0.3s; }
.ls-anim.ls-visible.ls-anim-d4 { animation-delay: 0.4s; }
.ls-anim.ls-visible.ls-anim-d5 { animation-delay: 0.5s; }
.ls-anim.ls-visible.ls-anim-d6 { animation-delay: 0.6s; }
/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .ls-anim { opacity: 1; animation: none !important; }
    .ls-line-draw { stroke-dasharray: none; stroke-dashoffset: 0; animation: none !important; }
    .ls-dot-pop { animation: none !important; opacity: 1; }
    .ls-dot-pulse, .ls-parallel-hint, .ls-glow-line { animation: none !important; }
}

/* Concept Breakdown: Ax = b hero */
.ls-concept-hero {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 2rem 1rem;
    margin: 1.5rem 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    flex-wrap: wrap;
}
[data-theme="dark"] .ls-concept-hero { background: var(--bg-tertiary); }

.ls-concept-block {
    text-align: center;
    animation: ls-fadeInUp 0.6s ease-out both;
}
.ls-concept-block:nth-child(1) { animation-delay: 0.1s; }
.ls-concept-block:nth-child(2) { animation-delay: 0.25s; }
.ls-concept-block:nth-child(3) { animation-delay: 0.4s; }
.ls-concept-block:nth-child(4) { animation-delay: 0.55s; }
.ls-concept-block:nth-child(5) { animation-delay: 0.7s; }

.ls-concept-symbol {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}
.ls-concept-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 0.375rem;
    color: var(--text-muted);
}

/* Color-coded matrix parts */
.ls-c-A { color: var(--ls-tool); }
.ls-c-x { color: #10b981; }
.ls-c-b { color: #f59e0b; }
.ls-c-eq { color: var(--text-muted); }

/* Matrix visual inside concept block */
.ls-mini-matrix {
    display: inline-grid;
    gap: 2px;
    border-left: 2.5px solid currentColor;
    border-right: 2.5px solid currentColor;
    border-radius: 3px;
    padding: 4px 6px;
    line-height: 1;
}
.ls-mini-matrix.cols-2 { grid-template-columns: 1fr 1fr; }
.ls-mini-matrix.cols-1 { grid-template-columns: 1fr; }
.ls-mini-cell {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    padding: 2px 4px;
    text-align: center;
}

/* Animated row highlight */
@keyframes ls-rowHighlight {
    0%, 100% { background: transparent; }
    50% { background: rgba(99, 102, 241, 0.12); }
}

/* ===== Geometric Visualization: 2D Lines ===== */
.ls-geo-viz {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin: 1.5rem 0;
}
@media (max-width: 600px) {
    .ls-geo-viz { grid-template-columns: 1fr; max-width: 280px; margin-left: auto; margin-right: auto; }
}

.ls-geo-card {
    border: 1.5px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}
.ls-geo-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}
[data-theme="dark"] .ls-geo-card:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.ls-geo-canvas {
    width: 100%;
    aspect-ratio: 1;
    background: var(--bg-secondary);
    display: block;
    position: relative;
    overflow: hidden;
}
[data-theme="dark"] .ls-geo-canvas { background: var(--bg-tertiary); }

.ls-geo-info {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border);
}
.ls-geo-title {
    font-weight: 700;
    font-size: 0.8125rem;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
}
.ls-geo-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* SVG animated lines - only play when parent card is visible */
.ls-line-draw {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
}
.ls-visible .ls-line-draw {
    animation: ls-drawLine 1.2s ease-out forwards;
}
@keyframes ls-drawLine {
    to { stroke-dashoffset: 0; }
}
.ls-visible .ls-line-draw-d2 { animation-delay: 0.4s; }
.ls-visible .ls-line-draw-d3 { animation-delay: 0.8s; }

/* Animated intersection dot - only when visible */
@keyframes ls-dotPop {
    0% { r: 0; opacity: 0; }
    70% { r: 6; opacity: 1; }
    100% { r: 4.5; opacity: 1; }
}
.ls-dot-pop { opacity: 0; }
.ls-visible .ls-dot-pop {
    animation: ls-dotPop 0.4s ease-out 1.5s both;
}

/* Pulsing dot for emphasis */
@keyframes ls-pulse {
    0%, 100% { r: 4.5; opacity: 1; }
    50% { r: 7; opacity: 0.6; }
}
.ls-dot-pulse {
    animation: ls-pulse 1.5s ease-in-out infinite;
}

/* No-solution parallel indicator */
@keyframes ls-parallelShift {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}
.ls-parallel-hint {
    animation: ls-parallelShift 2s ease-in-out infinite;
}

/* Infinite solutions glow */
@keyframes ls-glowLine {
    0%, 100% { stroke-opacity: 0.6; stroke-width: 2; }
    50% { stroke-opacity: 1; stroke-width: 4; }
}
.ls-glow-line {
    animation: ls-glowLine 2s ease-in-out infinite;
}

/* ===== Row Operation Animation ===== */
.ls-row-op-demo {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    justify-content: center;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.ls-matrix-box {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: 0.625rem;
    padding: 1rem 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    position: relative;
    transition: all 0.3s;
}
[data-theme="dark"] .ls-matrix-box { background: var(--bg-tertiary); }

.ls-matrix-box .ls-row {
    display: flex;
    gap: 0.75rem;
    padding: 0.25rem 0;
    border-radius: 0.25rem;
    transition: background 0.3s;
}

/* Row highlight on hover */
.ls-row-op-demo:hover .ls-highlight-row {
    animation: ls-rowHighlight 1.2s ease-in-out infinite;
}

.ls-arrow-animated {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}
.ls-arrow-animated svg {
    transition: transform 0.3s;
}
.ls-row-op-demo:hover .ls-arrow-animated svg {
    transform: translateX(4px);
}
.ls-op-label {
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--ls-tool);
    font-family: var(--font-mono);
    white-space: nowrap;
}

/* ===== Concept Flow: Step-by-Step Process ===== */
.ls-process-flow {
    display: flex;
    gap: 0;
    margin: 1.5rem 0;
    position: relative;
    align-items: stretch;
}
/* Process flow container is an ls-anim target but doesn't fade itself */
.ls-process-flow.ls-anim { opacity: 1; }
.ls-process-flow.ls-anim.ls-visible { animation: none; }
@media (max-width: 600px) {
    .ls-process-flow { flex-direction: column; }
}

.ls-process-step {
    flex: 1;
    text-align: center;
    padding: 1.25rem 0.75rem;
    position: relative;
    opacity: 0;
}
.ls-process-flow.ls-visible .ls-process-step {
    animation: ls-fadeInUp 0.5s ease-out forwards;
}
.ls-process-flow.ls-visible .ls-process-step:nth-child(1) { animation-delay: 0.1s; }
.ls-process-flow.ls-visible .ls-process-step:nth-child(2) { animation-delay: 0.3s; }
.ls-process-flow.ls-visible .ls-process-step:nth-child(3) { animation-delay: 0.5s; }
.ls-process-flow.ls-visible .ls-process-step:nth-child(4) { animation-delay: 0.7s; }

/* Connector arrow between steps */
.ls-process-step:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -1px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-left: 10px solid var(--ls-tool);
    opacity: 0.4;
    z-index: 1;
}
@media (max-width: 600px) {
    .ls-process-step:not(:last-child)::after {
        right: 50%;
        top: auto;
        bottom: -1px;
        transform: translateX(50%);
        border-left: 10px solid transparent;
        border-right: 10px solid transparent;
        border-top: 10px solid var(--ls-tool);
        border-bottom: none;
    }
}

.ls-process-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--ls-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.625rem;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--ls-tool);
    border: 2px solid var(--ls-tool);
    transition: transform 0.3s, background 0.3s;
}
.ls-process-step:hover .ls-process-icon {
    transform: scale(1.1);
    background: var(--ls-tool);
    color: #fff;
}
.ls-process-title {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}
.ls-process-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ===== Key Insight Callouts ===== */
.ls-callout {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-radius: 0.625rem;
    margin: 1rem 0;
    align-items: flex-start;
    animation: ls-fadeInUp 0.5s ease-out both;
}
.ls-callout-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.125rem;
}
.ls-callout-text {
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-secondary);
}
.ls-callout-text strong { color: var(--text-primary); }

.ls-callout-insight {
    background: var(--ls-light);
    border: 1px solid rgba(99, 102, 241, 0.2);
}
.ls-callout-tip {
    background: #dcfce7;
    border: 1px solid rgba(16, 185, 129, 0.2);
}
[data-theme="dark"] .ls-callout-tip {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
}

/* ===== Real-World Example ===== */
.ls-real-world {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    margin: 1.25rem 0;
}
[data-theme="dark"] .ls-real-world { background: var(--bg-tertiary); }

.ls-rw-header {
    padding: 0.75rem 1rem;
    background: var(--ls-light);
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--ls-tool);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.ls-rw-body {
    padding: 1rem 1.25rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-items: start;
}
@media (max-width: 600px) {
    .ls-rw-body { grid-template-columns: 1fr; }
}
.ls-rw-body p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}
.ls-rw-matrix {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    text-align: center;
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
}

/* ===== Responsive ===== */
@media (max-width: 767px) {
    .ls-grid-cell { width: 44px; height: 32px; font-size: 0.75rem; }
    .ls-grid-label { width: 44px; }
    .ls-dim-input { width: 50px; }
    .ls-concept-symbol { font-size: 1.25rem; }
    .ls-concept-hero { padding: 1.25rem 0.75rem; gap: 0.5rem; }
    .ls-row-op-demo { gap: 0.75rem; }
    .ls-matrix-box { padding: 0.75rem; font-size: 0.75rem; }
}