:root{--ink: #0b1b24;--ink2: #3c525c;--ink3: #6a7d85;--bg: #e7ecee;--surface: #ffffff;--surface2: #f2f6f7;--line: rgba(11, 27, 36, .12);--line2: rgba(11, 27, 36, .2);--depth: #0c6e7a;--depth2: #095560;--depth3: #073f47;--depth-tint: #e0eff0;--depth-mist: #f0f7f7;--cyan: #29b6c8;--panel: #0a1a22;--panel2: #12303b;--panel-top: #15333f;--panel-line: rgba(255, 255, 255, .1);--panel-amber: #ffd9a8;--panel-over-limit: #ff9b86;--ok: #137a47;--ok-tint: #e0f1e8;--ok-text: #0c5132;--ok-border: rgba(19, 122, 71, .2);--caution: #a9650a;--caution-tint: #faedd5;--caution-text: #7a4a06;--caution-border: rgba(169, 101, 10, .24);--danger: #b0271b;--danger-tint: #fbe3e0;--danger-text: #7e1b12;--danger-border: rgba(176, 39, 27, .24);--hazard: #c2410c;--hazard-tint: #fce9de;--hazard-text: #8a2c08;--hazard-border: rgba(194, 65, 12, .26);--info-border: rgba(12, 110, 122, .2);--radius-card: 14px;--radius-panel: 20px;--radius-small: 10px;--step-btn-w: 76px;--btn-min-h: 52px;--chip-min-h: 44px;--nav-min-h: 56px;--touch-min: 48px;--pad-screen: 16px;--pad-card: 18px;--font-ui: "Archivo", system-ui, sans-serif;--font-mono: "Spline Sans Mono", ui-monospace, monospace}@font-face{font-family:Archivo;src:url(/assets/archivo-EBcx4BEo.woff2) format("woff2");font-weight:100 900;font-display:swap}@font-face{font-family:Spline Sans Mono;src:url(/assets/spline_sans_mono-CNvg0CQS.woff2) format("woff2");font-weight:300 700;font-display:swap}*,*:before,*:after{box-sizing:border-box}html,body,#root{height:100%;margin:0}html{overscroll-behavior-y:none}body{background:var(--bg);color:var(--ink);font-family:var(--font-ui);font-size:16px;-webkit-font-smoothing:antialiased;overscroll-behavior-y:none}button{font-family:inherit;border:none;background:none;padding:0;cursor:pointer;color:inherit;touch-action:manipulation}.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.app{height:100dvh;max-width:520px;margin:0 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28px;overscroll-behavior-y:contain}.app-body:after{content:"";display:block;height:8px}.app-bottom{flex:none;background:var(--surface)}.settings-handle{width:100%;padding:6px 0;display:flex;justify-content:center;background:var(--surface);border-top:1px solid var(--line)}.settings-handle-pill{width:40px;height:4px;border-radius:2px;background:var(--line2)}.bottom-nav{display:flex;background:var(--surface);border-top:1px solid var(--line);padding:6px 6px calc(4px + env(safe-area-inset-bottom))}.bottom-nav-item{flex:1;min-height:var(--nav-min-h);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--ink3);border-radius:10px}.bottom-nav-item.selected{color:var(--depth)}.bottom-nav-label{font-size:11px;font-weight:700;letter-spacing:.2px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:0 1px 3px #0b1b2414;padding:var(--pad-card)}.eyebrow{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:700;letter-spacing:1.3px;text-transform:uppercase;color:var(--ink3);margin:0 0 8px}.primary-button{width:100%;min-height:var(--btn-min-h);border-radius:var(--radius-small);background:var(--depth);color:#fff;font-size:16px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;gap:8px}.primary-button:disabled{background:#6a7d8566;cursor:default}.ghost-button{width:100%;min-height:var(--btn-min-h);border-radius:var(--radius-small);background:var(--surface);border:1px solid var(--line2);color:var(--depth2);font-size:16px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;gap:8px}.ghost-button:disabled{color:#6a7d8580;cursor:default}.chip{min-height:var(--chip-min-h);padding:8px 14px;border-radius:999px;border:1px solid var(--line2);background:var(--surface);color:var(--ink2);font-size:14px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}.chip.compact{font-size:13px;padding:6px 10px}.chip.selected{background:var(--depth);border-color:var(--depth);color:#fff}.chip.selected.hazard{background:var(--hazard);border-color:var(--hazard)}.chip-row{display:flex;flex-wrap:wrap;gap:8px}.water-row{display:flex;gap:8px}.water-row .chip{flex:1}.unit-toggle{display:flex;gap:4px;padding:4px;background:var(--surface2);border:1px solid var(--line);border-radius:999px}.unit-toggle-segment{flex:1;min-height:var(--chip-min-h);border-radius:999px;font-size:15px;font-weight:700;color:var(--ink2)}.unit-toggle-segment.selected{background:var(--depth);color:#fff}.banner{display:flex;gap:10px;align-items:flex-start;border-radius:var(--radius-small);padding:13px 14px;font-size:14px;font-weight:500;line-height:20px}.banner-icon{flex:none;margin-top:1px}.banner-title{font-weight:800}.banner.ok{background:var(--ok-tint);color:var(--ok-text);border:1px solid var(--ok-border)}.banner.caution{background:var(--caution-tint);color:var(--caution-text);border:1px solid var(--caution-border)}.banner.danger{background:var(--danger-tint);color:var(--danger-text);border:1px solid var(--danger-border)}.banner.hazard{background:var(--hazard-tint);color:var(--hazard-text);border:1px solid var(--hazard-border)}.banner.info{background:var(--depth-mist);color:var(--depth3);border:1px solid var(--info-border)}.status-banner{padding:16px;gap:12px}.status-banner .status-headline{font-size:18px;font-weight:800;letter-spacing:-.3px}.status-banner 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.unit{font-size:.46em;color:var(--ink2)}.stepper-caption{font-size:12px;font-weight:600;color:var(--ink3);text-align:center;margin-top:2px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.panel{border-radius:var(--radius-panel);background:radial-gradient(120% 90% at 50% 0%,var(--panel-top) 0%,var(--panel) 100%);color:#fff;padding:20px 20px 22px}.panel-labels{display:flex;justify-content:space-between;align-items:baseline;gap:12px;font-size:12px;font-weight:700;letter-spacing:1.4px;color:#ffffff9e}.panel-labels .left{text-transform:uppercase}.panel-hero{display:flex;align-items:baseline;gap:6px;margin:8px 0 10px}.panel-hero-value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:600;font-size:76px;letter-spacing:-2px;line-height:1;color:#fff}.panel-hero-unit{font-family:var(--font-mono);font-size:30px;color:var(--cyan)}.panel-hero.over-limit .panel-hero-value,.panel-hero.over-limit .panel-hero-unit{color:var(--panel-over-limit)}.panel-divider{border:none;border-top:1px solid var(--panel-line);margin:10px 0}.panel-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px}.panel-row .label{font-size:13px;font-weight:600;color:#ffffffa8}.panel-row .value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:600;font-size:26px;color:#fff;white-space:nowrap}.panel-row.reference .label{font-size:13px;color:#ffffffb8}.panel-row.reference .value{font-size:15px;color:var(--panel-amber)}.scrim{position:fixed;inset:0;background:#0b1b2473;z-index:40;opacity:1;touch-action:none;overscroll-behavior:contain}.scrim:not(.open){opacity:0;pointer-events:none}.scrim,.bottom-sheet{transition:opacity .22s ease}.bottom-sheet{position:fixed;left:0;right:0;bottom:0;margin:0 auto;max-width:520px;max-height:88dvh;display:flex;flex-direction:column;background:var(--surface);border-radius:18px 18px 0 0;z-index:50;touch-action:none;transform:translateY(100%);transition:transform .28s cubic-bezier(.32,.72,.33,1);will-change:transform}.bottom-sheet.open{transform:translateY(0)}.bottom-sheet.dragging{transition:none}.bottom-sheet-grabber{padding:10px 0 4px;display:flex;justify-content:center;flex:none}.bottom-sheet-content{overflow-y:auto;padding:0 var(--pad-screen) calc(28px + env(safe-area-inset-bottom));touch-action:pan-y;overscroll-behavior-y:contain}.dialog{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);width:min(92vw,400px);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:22px 20px;z-index:50;box-shadow:0 18px 50px #0b1b2459;animation:dialog-in .2s ease-out}@keyframes dialog-in{0%{opacity:0;transform:translate(-50%,-50%) scale(.94)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}.dialog-title{font-size:19px;font-weight:800;margin:0 0 10px}.dialog-body{font-size:14px;line-height:20px;color:var(--ink2);margin:0 0 18px}.dialog-actions{display:flex;justify-content:flex-end;gap:8px}.dialog-action{min-height:44px;padding:0 14px;border-radius:8px;font-size:15px;font-weight:700;color:var(--depth)}.dialog-action:disabled{color:#6a7d8580;cursor:default}.text-field{width:100%;min-height:48px;padding:12px;border:1px solid var(--line2);border-radius:8px;font-family:inherit;font-size:16px;color:var(--ink);background:var(--surface)}.text-field:focus{outline:2px solid var(--depth);outline-offset:-1px;border-color:var(--depth)}.field-supporting{font-size:12px;color:var(--ink3);margin-top:6px}.keypad-label{font-size:14px;font-weight:700;color:var(--ink2);text-align:center;margin:6px 0 2px}.keypad-display{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:46px;font-weight:600;text-align:center;margin:8px 0 14px;min-height:52px}.keypad-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-bottom:14px}.keypad-key{min-height:58px;border-radius:12px;background:var(--surface2);border:1px solid var(--line);font-family:var(--font-mono);font-size:22px;font-weight:600;color:var(--ink);display:inline-flex;align-items:center;justify-content:center}.keypad-key:active{background:var(--depth-mist)}.ppo2-info-card{width:100%;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:10px}.ppo2-info-overline{font-size:11px;font-weight:700;letter-spacing:1.2px;color:var(--ink3);text-transform:uppercase}.ppo2-info-value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:22px;font-weight:700;color:var(--depth)}.ppo2-info-value.hazard{color:var(--hazard)}.ppo2-info-method{font-size:13px;font-weight:600;color:var(--ink2);margin-left:8px}.ppo2-info-icons{display:flex;align-items:center;color:var(--ink3);flex:none}.tank-row{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-small);padding:12px 14px;display:flex;align-items:center;gap:10px}.tank-row-main{flex:1;min-width:0;text-align:left}.tank-row-name{font-size:15px;font-weight:700;color:var(--ink);display:inline-flex;align-items:center;gap:6px}.tank-row-name .pencil{color:var(--ink3)}.tank-row-meta{font-size:12px;font-weight:600;color:var(--ink3);margin-top:2px}.tank-row-mod{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:20px;font-weight:600;color:var(--depth2);white-space:nowrap}.tank-row-trash{width:var(--touch-min);height:var(--touch-min);display:inline-flex;align-items:center;justify-content:center;color:var(--ink3);flex:none}.tank-list{display:flex;flex-direction:column;gap:8px}.mix-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px}.mix-card{text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:0 1px 3px #0b1b2414;padding:14px}.mix-card.emphasised{border:1.5px solid var(--depth)}.mix-card-name{font-size:19px;font-weight:800;letter-spacing:-.3px}.mix-card-oxygen{font-size:12px;font-weight:600;color:var(--ink3);margin-top:1px}.mix-card-mod{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:28px;font-weight:600;color:var(--depth2);margin-top:8px}.mix-card-mod .unit{font-size:15px;color:var(--ink3)}.mix-card-footnote{font-size:11px;font-weight:600;color:var(--ink3);margin-top:3px}.sheet-title{font-size:20px;font-weight:800;margin:4px 0 16px}.method-card{width:100%;text-align:left;border:1px solid var(--line2);border-radius:var(--radius-small);padding:12px 14px;background:var(--surface);display:flex;align-items:center;gap:10px}.method-card.selected{border:2px solid var(--depth);background:#0c6e7a1a;padding:11px 13px}.method-card.selected.hazard{border-color:var(--hazard);background:#c2410c1a}.method-card-body{flex:1;min-width:0}.method-card-title{display:flex;align-items:baseline;gap:8px}.method-card-name{font-size:15px;font-weight:800}.method-card-ppo2{font-family:var(--font-mono);font-size:12px;font-weight:700;color:var(--depth)}.method-card.hazard-accent .method-card-ppo2{color:var(--hazard)}.method-card-summary{font-size:13px;line-height:19px;color:var(--ink2);margin-top:3px}.method-card-example{font-family:var(--font-mono);font-size:12px;font-weight:700;color:var(--depth);margin-top:5px}.method-card.hazard-accent .method-card-example{color:var(--hazard)}.method-card-check{color:var(--depth);flex:none}.method-card.hazard-accent .method-card-check{color:var(--hazard)}.card-note{font-size:12px;line-height:17px;font-weight:600;color:var(--ink3);padding-top:10px}.safety-paragraph{font-size:14px;line-height:21px;color:var(--ink2);margin:0}.safety-paragraph strong{color:var(--ink);font-weight:800}.formula-block{background:var(--panel);border-radius:var(--radius-small);padding:14px 16px;font-family:var(--font-mono);font-size:15px;line-height:26px;color:#cfeef2;overflow-x:auto;white-space:nowrap}.formula-block .accent{color:var(--cyan)}.kv-row{display:flex;gap:12px;padding:9px 0}.kv-key{font-family:var(--font-mono);font-weight:700;color:var(--depth2);min-width:42px;flex:none}.kv-value{font-size:14px;line-height:21px;color:var(--ink2)}.footnote{font-size:12px;line-height:17px;font-weight:600;color:var(--ink3)}.checklist-step{display:flex;gap:10px;align-items:flex-start;font-size:14px;line-height:21px;color:var(--ink)}.checklist-step .check{color:var(--depth);flex:none;margin-top:1px}.checklist-image{width:100%;aspect-ratio:1;border-radius:var(--radius-small);border:1px solid var(--line);object-fit:cover;margin-top:10px}.link-row{width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--surface);border:1px solid var(--line2);border-radius:var(--radius-small);padding:12px 14px;text-decoration:none}.link-row-title{font-size:14px;font-weight:700;color:var(--ink)}.link-row-source{font-size:12px;font-weight:600;color:var(--ink3);margin-top:1px}.link-row .external{color:var(--depth2);flex:none}.disclaimer{background:var(--surface2);border:1px solid var(--line2);border-radius:var(--radius-small);padding:14px 15px;font-size:13px;line-height:20px;color:var(--ink2)}.gap-10{height:10px}.gap-12{height:12px}.gap-14{height:14px}.gap-16{height:16px}.gap-22{height:22px}.helper-text{font-size:12px;font-weight:600;color:var(--ink3);text-align:center;margin-top:8px}.mix-context-line{font-size:13px;font-weight:600;color:var(--ink3);text-align:center;padding-top:10px}.mix-context-line strong{color:var(--ink)}