.issue-gas{--f-display:"Dongle", "Gothic A1", system-ui, sans-serif;--bg:#eceff1;--surface:#fff;--surface-2:#eef3f6;--ink:#16212a;--ink-2:#4b5a66;--ink-3:#77848e;--rule:#c3cdd4;--accent:#1b6e9b;--on-accent:#fff;--field:#eef3f6;background:var(--bg);min-height:100dvh}body:has(.issue-gas){background:#eceff1}.gas-k-oxygen{--g:#1b6e9b;--g-soft:#e1eff6}.gas-k-co2{--g:#1e7a6b;--g-soft:#def0ec}.gas-k-nitrogen{--g:#6b4e9b;--g-soft:#ebe5f5}.gas-k-other{--g:#c2691f;--g-soft:#fbebdb}.gas-k-volume{--g:#a03a5e;--g-soft:#f8e4eb}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .issue-gas{--bg:#101314;--surface:#1a1f22;--surface-2:#222a2e;--ink:#e9eef1;--ink-2:#b0bdc5;--ink-3:#7e8b94;--rule:#3a454b;--accent:#6fbce0;--on-accent:#101314;--field:#1f272b}:root:not([data-theme=light]) .gas-k-oxygen{--g:#6fbce0;--g-soft:#122630}:root:not([data-theme=light]) .gas-k-co2{--g:#5fc7b2;--g-soft:#112a26}:root:not([data-theme=light]) .gas-k-nitrogen{--g:#b49ae6;--g-soft:#231c33}:root:not([data-theme=light]) .gas-k-other{--g:#e8955a;--g-soft:#2e1f13}:root:not([data-theme=light]) .gas-k-volume{--g:#e88fac;--g-soft:#2e1520}:root:not([data-theme=light]) body:has(.issue-gas){background:#101314}}:root[data-theme=dark] .issue-gas{--bg:#101314;--surface:#1a1f22;--surface-2:#222a2e;--ink:#e9eef1;--ink-2:#b0bdc5;--ink-3:#7e8b94;--rule:#3a454b;--accent:#6fbce0;--on-accent:#101314;--field:#1f272b}:root[data-theme=dark] .gas-k-oxygen{--g:#6fbce0;--g-soft:#122630}:root[data-theme=dark] .gas-k-co2{--g:#5fc7b2;--g-soft:#112a26}:root[data-theme=dark] .gas-k-nitrogen{--g:#b49ae6;--g-soft:#231c33}:root[data-theme=dark] .gas-k-other{--g:#e8955a;--g-soft:#2e1f13}:root[data-theme=dark] .gas-k-volume{--g:#e88fac;--g-soft:#2e1520}:root[data-theme=dark] body:has(.issue-gas){background:#101314}.issue-gas .masthead__title{font-family:var(--f-display);letter-spacing:0;font-size:clamp(46px,7vw,86px);font-weight:700;line-height:1.1}.issue-gas .card h3,.issue-gas .contents__head h2,.issue-gas .sec__head h2{font-family:Gothic A1,system-ui,sans-serif;font-weight:800}.issue-gas .tag{background:var(--g-soft,var(--surface-2));color:var(--g,var(--ink-2))}.issue-gas .toc li .toc__tag{background:var(--g-soft,var(--surface-2));color:var(--g,var(--ink-3))}.issue-gas .chip[data-group=oxygen][aria-pressed=true]{color:#fff;background:#1b6e9b;border-color:#1b6e9b}.issue-gas .chip[data-group=co2][aria-pressed=true]{color:#fff;background:#1e7a6b;border-color:#1e7a6b}.issue-gas .chip[data-group=nitrogen][aria-pressed=true]{color:#fff;background:#6b4e9b;border-color:#6b4e9b}.issue-gas .chip[data-group=other][aria-pressed=true]{color:#fff;background:#c2691f;border-color:#c2691f}.issue-gas .chip[data-group=volume][aria-pressed=true]{color:#fff;background:#a03a5e;border-color:#a03a5e}.issue-gas .chip[data-group=oxygen]:before,.issue-gas .chip[data-group=co2]:before,.issue-gas .chip[data-group=nitrogen]:before,.issue-gas .chip[data-group=volume]:before,.issue-gas .chip[data-group=other]:before{content:"";vertical-align:1px;border-radius:50%;width:8px;height:8px;margin-right:7px;display:inline-block}.issue-gas .chip[data-group=oxygen]:before{background:#1b6e9b}.issue-gas .chip[data-group=co2]:before{background:#1e7a6b}.issue-gas .chip[data-group=nitrogen]:before{background:#6b4e9b}.issue-gas .chip[data-group=volume]:before{background:#a03a5e}.issue-gas .chip[data-group=other]:before{background:#c2691f}.issue-gas .card p.text{max-width:none;font-size:18px}.issue-gas .card .lede{font-size:20px;line-height:1.7}.issue-gas .sec{max-width:960px;margin-left:auto;margin-right:auto}.gas-usetag{color:var(--ink-3);border:1px solid var(--rule);border-radius:999px;padding:3px 10px;font-size:12.5px;font-weight:500;line-height:1.6}.gas-property{background:var(--g-soft,var(--surface-2));border-radius:var(--radius-sm);color:var(--ink);flex-wrap:wrap;align-items:baseline;gap:10px;margin:0 0 14px;padding:10px 14px;font-size:17px;font-weight:700;line-height:1.6;display:flex}.gas-property b{color:var(--g,var(--accent));flex:none;font-size:12px;font-weight:700}.gas-findbox{background:var(--surface);border:1px solid var(--rule);border-left:7px solid var(--g,var(--accent));border-radius:var(--radius-sm);margin:2px 0 18px;padding:14px 16px}.gas-findbox__head{color:var(--ink);margin:0 0 8px;font-size:17px;font-weight:800}.gas-findbox ul{margin:0;padding:0;list-style:none}.gas-findbox li{color:var(--ink-2);gap:9px;padding:4px 0;font-size:16px;line-height:1.75;display:flex}.gas-findbox li:before{content:"○";color:var(--g,var(--accent));flex:none;margin-top:.35em;font-size:12px}.issue-gas .bignum{border-radius:var(--radius-sm);background:var(--g-soft,var(--surface-2));flex-wrap:wrap;align-items:baseline;gap:12px;margin:0 0 16px;padding:14px 16px;display:flex}.issue-gas .bignum strong{letter-spacing:-.02em;color:var(--g,var(--accent));font-variant-numeric:tabular-nums;font-size:clamp(26px,3vw,38px);font-weight:800;line-height:1.1}.issue-gas .bignum span{color:var(--ink-2);font-size:16px;line-height:1.6}.gas-airlist{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:0;padding:0;list-style:none;display:grid}.gas-airlist__item{background:var(--surface);border:1px solid var(--rule);border-top:4px solid var(--accent);border-radius:var(--radius-sm);padding:14px 16px}.gas-airlist__item b{color:var(--ink);font-size:16px;font-weight:800;display:block}.gas-airlist__item strong{color:var(--accent);font-variant-numeric:tabular-nums;margin:2px 0 6px;font-size:24px;font-weight:800;display:block}.gas-airlist__item p{color:var(--ink-2);margin:0;font-size:16px;line-height:1.7}.gas-ways{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin:0;padding:0;list-style:none;display:grid}.gas-ways__item{background:var(--surface);border:1px solid var(--rule);border-radius:var(--radius-sm);padding:14px 16px}.gas-ways__item b{color:var(--ink);margin-bottom:4px;font-size:16px;font-weight:800;display:block}.gas-ways__item p{color:var(--ink-2);margin:0;font-size:16px;line-height:1.7}.gas-glossary{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2px 28px;margin:0;display:grid}.gas-glossary__item{border-bottom:1px solid var(--rule);align-items:baseline;gap:10px;padding:9px 0;display:flex}.gas-glossary__item dt{color:var(--accent);flex:none;font-size:16px;font-weight:800}.gas-glossary__item dd{color:var(--ink-2);margin:0;font-size:16px;line-height:1.7}.issue-gas .card__foot{flex-direction:column;gap:9px;display:flex}.issue-gas .srclabel{color:var(--ink-3);margin:0;font-size:12px;font-weight:700}.issue-gas .srclinks{gap:8px;margin:0;padding:0;list-style:none;display:grid}.issue-gas .srclinks a{color:var(--accent);font-size:14.5px;font-weight:500;line-height:1.6;text-decoration:none;display:inline-block}.issue-gas .srclinks a:hover{text-underline-offset:3px;text-decoration:underline}.issue-gas .srcbook{color:var(--ink-3);font-size:14px;line-height:1.6;display:inline-block}