/* Long-tail algebra pages (matrix, inequalities, simplify, factoring). Uses the site tokens from style.css. */
.lt-ex { background: var(--card); border: 1px solid var(--line-2); border-radius: var(--radius-s); padding: 16px; margin: 14px 0; }
.lt-ex h3 { margin: 0 0 10px; font-size: 1.05rem; font-family: var(--font-mono); font-weight: 600; overflow-wrap: anywhere; }
.lt-steps { list-style: none; margin: 0; padding: 0; counter-reset: lt; }
.lt-steps li { counter-increment: lt; position: relative; padding: 8px 0 8px 30px; border-top: 1px solid var(--line-2); margin: 0; }
.lt-steps li:first-child { border-top: 0; }
.lt-steps li::before { content: counter(lt); position: absolute; left: 0; top: 9px; width: 22px; height: 22px; border-radius: 50%; background: var(--paper-2); color: var(--ink-2); font-size: .8rem; display: grid; place-items: center; }
.lt-steps b { display: block; font-weight: 650; }
.lt-line { display: block; margin: 4px 0; overflow-x: auto; max-width: 100%; font-family: var(--font-mono); font-size: .92rem; }
.lt-line .katex { font-size: 1.05em; }
.lt-line.plain { white-space: pre-wrap; overflow-wrap: anywhere; }
.lt-why { display: block; color: var(--ink-3); font-size: .9rem; }
.lt-ans { margin: 12px 0 4px; padding: 10px 12px; background: var(--paper-2); border-radius: 8px; overflow-x: auto; }
.lt-check { margin: 6px 0; color: var(--ink-2); font-size: .92rem; }
.lt-shot { margin: 12px 0 4px; }
.lt-shot img { display: block; width: 100%; height: auto; border: 1px solid var(--line-2); border-radius: 8px; }
.lt-open { margin: 8px 0 0; font-size: .92rem; }
.lt-nl { margin: 12px 0 4px; }
.lt-nl svg { display: block; width: 100%; height: auto; max-width: 600px; }
.lt-nl figcaption { color: var(--ink-3); font-size: .85rem; }
.nl-axis { stroke: var(--ink-3); stroke-width: 2; }
.nl-tick { stroke: var(--ink-3); stroke-width: 1.5; }
.nl-txt { fill: var(--ink-2); font-size: 13px; font-family: var(--font-mono); }
.nl-end { fill: var(--accent-deep); font-weight: 700; }
.nl-seg { stroke: var(--accent); stroke-width: 6; stroke-linecap: round; }
.nl-arrow { fill: var(--accent); }
.nl-pt { fill: var(--accent); stroke: var(--accent); stroke-width: 2.5; }
.nl-pt.nl-open { fill: var(--card); }
@media (max-width: 480px) { .lt-ex { padding: 12px; } }