.wrap--narrow[data-astro-cid-feirbkum]{max-width:820px}.crumbs[data-astro-cid-feirbkum]{font-family:var(--v-mono);font-size:.72rem;color:var(--v-muted);margin:22px 0 0}.crumbs[data-astro-cid-feirbkum] a[data-astro-cid-feirbkum]{color:var(--v-muted)}.head[data-astro-cid-feirbkum]{padding:12px 0 4px}.eyebrow-mono[data-astro-cid-feirbkum]{font-family:var(--v-mono);font-size:.7rem;font-weight:600;letter-spacing:.15em;text-transform:uppercase;color:var(--v-coral-eyebrow);margin:0 0 12px}.head[data-astro-cid-feirbkum] h1[data-astro-cid-feirbkum]{font-size:clamp(1.9rem,4.6vw,2.9rem);letter-spacing:-.02em;margin:0}.byline[data-astro-cid-feirbkum]{font-size:.84rem;color:var(--v-muted);margin:14px 0 0;font-family:var(--v-mono)}.answer[data-astro-cid-feirbkum]{background:var(--v-panel-bg);color:var(--v-panel-fg);border-radius:18px;padding:26px;margin:26px 0}.answer[data-astro-cid-feirbkum] .q[data-astro-cid-feirbkum]{font-family:var(--v-mono);font-size:.74rem;letter-spacing:.09em;text-transform:uppercase;color:var(--v-panel-accent);margin:0 0 10px}.answer[data-astro-cid-feirbkum] p[data-astro-cid-feirbkum]{margin:0;font-size:1.08rem;line-height:1.6;max-width:66ch}.answer[data-astro-cid-feirbkum] mark{background:#34d5e838;color:var(--v-panel-fg);padding:.05em .3em;border-radius:5px}.lede[data-astro-cid-feirbkum]{font-size:1.05rem;color:var(--v-ink-2);max-width:72ch;margin:0 0 8px}.lede[data-astro-cid-feirbkum] a{color:var(--v-accent-700)}.formula[data-astro-cid-feirbkum]{background:var(--v-surface);border:1px solid var(--v-border);border-radius:16px;box-shadow:var(--v-shadow);margin:24px 0;overflow:hidden}.formula__h[data-astro-cid-feirbkum]{padding:14px 20px;background:var(--v-surface-2);border-bottom:1px solid var(--v-border);font-family:var(--v-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--v-muted);font-weight:700}.formula__eq[data-astro-cid-feirbkum]{padding:18px 20px;font-family:var(--v-mono);font-size:clamp(1rem,2.4vw,1.25rem);color:var(--v-ink);border-bottom:1px solid var(--v-border-2);overflow-x:auto}.formula__eq[data-astro-cid-feirbkum] b{color:var(--v-accent-700)}.worked-ex[data-astro-cid-feirbkum]{padding:16px 20px}.worked-ex[data-astro-cid-feirbkum] .lab[data-astro-cid-feirbkum]{font-family:var(--v-mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:var(--v-good);font-weight:700}.worked-ex[data-astro-cid-feirbkum] .steps[data-astro-cid-feirbkum]{font-family:var(--v-mono);font-size:.9rem;color:var(--v-ink-2);margin:8px 0 0;display:flex;flex-direction:column;gap:4px;overflow-x:auto}.worked-ex[data-astro-cid-feirbkum] .steps[data-astro-cid-feirbkum] b{color:var(--v-accent-700)}.worked-ex[data-astro-cid-feirbkum] .res[data-astro-cid-feirbkum]{margin-top:8px;font-family:var(--v-mono);font-weight:700;color:var(--v-ink)}.mistake[data-astro-cid-feirbkum]{margin:0;padding:14px 20px;background:var(--v-coral-soft);border-top:1px solid var(--v-border-2);font-size:.9rem;color:var(--v-coral-text);line-height:1.55}.mistake[data-astro-cid-feirbkum] b[data-astro-cid-feirbkum]{color:var(--v-coral-eyebrow);font-family:var(--v-mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;display:block;margin-bottom:3px}.diagram[data-astro-cid-feirbkum]{margin:24px 0}.diagram[data-astro-cid-feirbkum] img[data-astro-cid-feirbkum]{display:block;width:100%;height:auto;border:1px solid var(--v-border);border-radius:16px;background:#eaf4f6}.diagram[data-astro-cid-feirbkum] figcaption[data-astro-cid-feirbkum]{margin:10px 2px 0;font-family:var(--v-mono);font-size:.78rem;line-height:1.5;color:var(--v-muted)}.drill[data-astro-cid-feirbkum],.samples-sec[data-astro-cid-feirbkum],.faq-sec[data-astro-cid-feirbkum],.next[data-astro-cid-feirbkum]{margin:40px 0}h2[data-astro-cid-feirbkum]{font-size:clamp(1.4rem,2.8vw,1.85rem);letter-spacing:-.02em;margin:0 0 6px}.drill-intro[data-astro-cid-feirbkum],.samples-lede[data-astro-cid-feirbkum]{color:var(--v-ink-2);max-width:70ch;margin:0 0 16px}.drill-island[data-astro-cid-feirbkum]{margin-top:16px}.samples[data-astro-cid-feirbkum]{list-style:none;counter-reset:sample;margin:0;padding:0;display:grid;gap:12px}.sample[data-astro-cid-feirbkum]{counter-increment:sample;border:1px solid var(--v-border);border-radius:14px;background:var(--v-surface);padding:16px 18px;box-shadow:var(--v-shadow)}.sample__q[data-astro-cid-feirbkum]{font-weight:600;margin:0 0 12px;color:var(--v-ink)}.sample__q[data-astro-cid-feirbkum]:before{content:counter(sample) ". ";color:var(--v-muted)}.sample__choices[data-astro-cid-feirbkum]{list-style:none;margin:0 0 12px;padding:0;display:grid;gap:6px}.sample__choices[data-astro-cid-feirbkum] li[data-astro-cid-feirbkum]{display:flex;gap:10px;align-items:baseline;font-size:.92rem;color:var(--v-ink-2)}.sample__letter[data-astro-cid-feirbkum]{font-weight:700;color:var(--v-accent-700);flex:none;width:1.2rem;font-family:var(--v-mono)}.sample__answer[data-astro-cid-feirbkum] summary[data-astro-cid-feirbkum]{cursor:pointer;font-weight:600;color:var(--v-accent-700);font-size:.9rem}.sample__correct[data-astro-cid-feirbkum]{font-weight:600;color:var(--v-good);margin:10px 0 6px}.sample__answer[data-astro-cid-feirbkum] p[data-astro-cid-feirbkum]:last-child{font-size:.92rem;margin:6px 0 0;color:var(--v-ink-2);line-height:1.6}.faq-h[data-astro-cid-feirbkum]{margin-bottom:16px}.faq[data-astro-cid-feirbkum] details[data-astro-cid-feirbkum]{background:var(--v-surface);border:1px solid var(--v-border);border-radius:12px;margin-bottom:10px;box-shadow:var(--v-shadow);overflow:hidden}.faq[data-astro-cid-feirbkum] summary[data-astro-cid-feirbkum]{cursor:pointer;padding:15px 18px;font-weight:600;color:var(--v-ink);list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}.faq[data-astro-cid-feirbkum] summary[data-astro-cid-feirbkum]::-webkit-details-marker{display:none}.faq[data-astro-cid-feirbkum] summary[data-astro-cid-feirbkum]:after{content:"+";font-family:var(--v-mono);color:var(--v-accent-700);font-size:1.2rem}.faq[data-astro-cid-feirbkum] details[data-astro-cid-feirbkum][open] summary[data-astro-cid-feirbkum]:after{content:"−"}.faq[data-astro-cid-feirbkum] p[data-astro-cid-feirbkum]{margin:0;padding:0 18px 16px;color:var(--v-ink-2);font-size:.95rem;max-width:70ch;line-height:1.6}.faq[data-astro-cid-feirbkum] p[data-astro-cid-feirbkum] a{color:var(--v-accent-700)}.next-list[data-astro-cid-feirbkum]{list-style:none;margin:0;padding:0;display:grid;gap:10px}.next-list[data-astro-cid-feirbkum] li[data-astro-cid-feirbkum]{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 12px;padding:13px 16px;border:1px solid var(--v-border);border-radius:12px;background:var(--v-surface)}.next-list[data-astro-cid-feirbkum] a[data-astro-cid-feirbkum]{font-weight:600;color:var(--v-accent-700);text-decoration:none}.next-list[data-astro-cid-feirbkum] a[data-astro-cid-feirbkum]:hover{text-decoration:underline}.next-list[data-astro-cid-feirbkum] span[data-astro-cid-feirbkum]{font-size:.86rem;color:var(--v-muted)}