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rgba(15,23,32,0.05),0 10px 24px rgba(15,23,32,0.07)}.ch-step-head{display:grid;grid-template-columns:2.1rem minmax(0,1fr);align-items:baseline;gap:0.85rem}.ch-step-n{display:inline-flex;align-items:center;justify-content:center;width:2.1rem;height:2.1rem;border-radius:999px;background:var(--ink);color:var(--surface);font-size:0.95rem;font-weight:600;font-variant-numeric:tabular-nums;transform:translateY(0.18rem)}.ch-body section:has(.ch-step){padding-bottom:3.4rem}.ch-step:last-child{margin-bottom:0}.ch-step figcaption{margin-top:0.6rem;text-align:center;font-size:0.82rem;line-height:1.45;color:var(--ink-faint)}.chapter{display:grid;grid-template-columns:13.5rem minmax(0,1fr);gap:3.5rem;align-items:start;padding:2.8rem 0 4rem}.chapter-plain{grid-template-columns:minmax(0,1fr)}.toc{position:sticky;top:5.5rem;border-left:1px solid var(--line);padding-left:1.1rem}.toc 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0.2rem;font-family:var(--mono);font-size:0.68rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--note-hue, var(--ink))}.ch-note p{margin-top:0.7rem}.ch-note ul{margin-top:0.9rem;gap:0.8rem}.ch-body ol.ch-steps{list-style:none;counter-reset:step;margin:1.4rem 0 0;padding:0}.ch-body ol.ch-steps>li{counter-increment:step;position:relative;padding:0 0 0.95rem 2.6rem;color:var(--ink-soft);line-height:1.58;max-width:58ch}.ch-body ol.ch-steps>li:last-child{padding-bottom:0}.ch-body ol.ch-steps>li::before{content:counter(step);position:absolute;left:0;top:0.05rem;width:1.7rem;height:1.7rem;display:grid;place-items:center;border-radius:50%;background:var(--accent-soft);border:1px solid #cdeee7;color:var(--accent-text);font-family:var(--mono);font-size:0.72rem;font-weight:700}.ch-body ol.ch-steps ul{margin-top:0.55rem}.ch-body li:has(>input[type=checkbox]){padding-left:1.6rem}.ch-body li:has(>input[type=checkbox])::before{display:none}.ch-body input[type=checkbox]{position:absolute;left:0;top:0.32em;width:0.95rem;height:0.95rem;accent-color:var(--accent)}.terms{margin:0}.terms .term{display:grid;grid-template-columns:12rem minmax(0,1fr);gap:1.25rem;padding:0.85rem 0;border-top:1px solid var(--line)}.terms dt{font-weight:700;color:var(--ink)}.terms dd{margin:0;color:var(--ink-soft);line-height:1.58}.term-letter{margin:2.2rem 0 0.2rem;font-family:var(--mono);font-size:0.72rem;font-weight:700;letter-spacing:0.14em;color:var(--accent-text);scroll-margin-top:5.5rem}.term-letter:first-child{margin-top:0}.ch-pager{margin-top:3.5rem;padding-top:1.4rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}.ch-pager a{text-decoration:none;display:grid;gap:0.2rem;max-width:18rem}.ch-pager span{font-family:var(--mono);font-size:0.64rem;font-weight:600;letter-spacing:0.11em;text-transform:uppercase;color:var(--ink-faint)}.ch-pager b{font-weight:650;color:var(--ink)}.ch-pager a:hover 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a{min-width:2.4rem;justify-content:center}}@media(max-width:760px){body.help-chapter .site-header{position:static}.toc{top:0}}@media(max-width:640px){.pairs div{grid-template-columns:minmax(0,1fr);gap:0.2rem}.terms .term{grid-template-columns:minmax(0,1fr);gap:0.15rem}.ch-pager{display:grid}.ch-pager .next{text-align:left}.table-scroll th:first-child,.table-scroll td:first-child{min-width:10rem}}.hub{padding:2.8rem 0 1rem}.hub-sec+.hub-sec{margin-top:3.4rem}.hub-sec h2{margin:0;font-size:1.72rem;font-weight:800;letter-spacing:-0.035em}.hub-sub{margin:0.6rem 0 0;color:var(--ink-faint);max-width:58ch}.doors{margin-top:1.6rem;display:grid;gap:0.9rem;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr))}.door{display:block;padding:1.15rem 1.2rem;border:1px solid var(--line);border-radius:12px;background:var(--surface);text-decoration:none;transition:border-color 0.14s ease,transform 0.14s ease}.door:hover{border-color:var(--accent);transform:translateY(-2px)}.door h3{margin:0;font-size:1.02rem;font-weight:700;color:var(--ink)}.door p{margin:0.4rem 0 0;font-size:0.92rem;line-height:1.5;color:var(--ink-soft)}.contents{margin-top:1.5rem;border-top:1px solid var(--line)}.chapter-link{display:grid;grid-template-columns:3rem minmax(0,1fr);gap:0.4rem;align-items:baseline;padding:0.85rem 0.6rem;border-bottom:1px solid var(--line);text-decoration:none}.chapter-link:hover{background:var(--surface)}.chapter-link .no{font-family:var(--mono);font-size:0.72rem;font-weight:600;letter-spacing:0.06em;color:var(--ink-faint);font-variant-numeric:tabular-nums}.chapter-link .what{color:var(--ink-soft);font-size:0.95rem;line-height:1.5}.chapter-link .what b{display:block;font-size:1.02rem;font-weight:700;color:var(--ink);margin-bottom:0.1rem}.chapter-link:hover .what b{color:var(--accent-text)}.faq{margin-top:1.6rem;display:grid;gap:1.8rem}.faq-group h3{margin:0 0 0.6rem;font-family:var(--mono);font-size:0.68rem;font-weight:700;letter-spacing:0.11em;text-transform:uppercase}.faq-group h3 a{color:var(--accent-text);text-decoration:none}.faq-group h3 a:hover{text-decoration:underline}.faq details{border:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:10px;background:var(--surface);padding:0;margin-bottom:0.5rem}.faq summary{cursor:pointer;list-style:none;display:block;padding:0.8rem 2.4rem 0.8rem 1rem;font-weight:650;font-size:0.98rem;color:var(--ink);position:relative}.faq summary::-webkit-details-marker{display:none}.faq summary::after{content:"";font-size:0;position:absolute;right:1rem;top:1.15rem;width:8px;height:8px;border-right:1.5px solid var(--ink-faint);border-bottom:1.5px solid var(--ink-faint);transform:rotate(45deg);transition:transform 0.16s ease}.faq details[open] summary::after{transform:rotate(-135deg);top:1.35rem}.faq details p{margin:0;padding:0 1rem 0.95rem;color:var(--ink-soft);line-height:1.6;max-width:62ch}.faq details a{color:var(--accent-text);text-underline-offset:3px}.hub-band{margin-top:3.5rem;padding:3rem 0;background:var(--ink);color:#fff;text-align:center}.hub-band h2{margin:0 0 0.4rem;font-size:1.6rem;font-weight:800;letter-spacing:-0.03em}.hub-band p{margin:0 auto 1.4rem;color:rgb(255 255 255 / 72%);max-width:46ch}.hub-band .btn-primary{background:var(--accent);color:#fff}.hub-band .btn-primary:hover{background:#14b8a6}@media(max-width:640px){.chapter-link{grid-template-columns:2.2rem minmax(0,1fr);padding-inline:0}}