:root{--paper: #f2ecdd;--paper-lite: #fbf8ef;--paper-dark: #e9e1cd;--paper-ad: #efe7d4;--ink: #1f211b;--ink-soft: #5b5c4f;--ink-faint: #9a937c;--line: #cabf9f;--line-soft: #e3dac3;--line-card: #ece3cd;--green: #3f5527;--green-dark: #243018;--green-lite: #c2d39a;--green-pale: #9fb36f;--green-rule: #3a4a26;--water: #2c6f8d;--water-lite: #4f9fce;--amber: #c07d12;--amber-bright: #e0a23a;--soil-1: #6b5236;--soil-2: #8a6a3f;--soil-3: #c2a368;--soil-water: #4f7d97;--soil-base: #5c5446;--font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, "Cascadia Code", "Segoe UI Mono", Consolas, monospace;--maxw: 1200px;--pad: 40px;--shadow: 0 1px 3px rgba(31, 33, 27, .08)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}h1,h2,h3{letter-spacing:-.025em;text-wrap:balance}h1{font-weight:800;font-size:clamp(2rem,4.2vw,3.1rem);line-height:1.05;margin:0 0 .35em}h2{font-weight:800;font-size:clamp(1.4rem,3vw,2.1rem);margin:1.4em 0 .5em}h3{font-weight:700;font-size:1.1rem;margin:1.3em 0 .4em}p{margin:0 0 1em}a{color:var(--water);text-decoration:none}a:hover{text-decoration:underline}:focus-visible{outline:2px solid var(--amber);outline-offset:2px}.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}main{min-height:60vh;padding:36px 0 0;display:flow-root}.eyebrow{font-family:var(--mono);font-weight:700;font-size:.75rem;letter-spacing:.18em;text-transform:uppercase;color:var(--water);margin:0 0 12px}.lede{font-size:1.08rem;color:var(--ink-soft);margin:0 0 24px;max-width:60ch}.bleed{width:100vw;position:relative;left:50%;right:50%;margin-left:-50vw;margin-right:-50vw}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}.sec-paper{background:var(--paper)}.sec-dark{background:var(--paper-dark);border-top:3px solid var(--ink)}.sec-pad{padding:46px 0}.site-header{background:var(--green-dark);border-bottom:3px solid #11160c}.site-header .inner{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad);height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:inline-flex;align-items:center;gap:11px;color:var(--paper-lite)}.brand:hover{text-decoration:none}.brand .glyph{display:block;flex:none}.brand .b-text{display:flex;flex-direction:column;line-height:1}.brand .b-word{font-weight:800;font-size:1.18rem;letter-spacing:-.025em}.brand .b-sub{font-family:var(--mono);font-weight:600;font-size:.56rem;letter-spacing:.18em;color:var(--green-lite);margin-top:4px}.site-nav{display:flex;gap:28px;align-items:center}.site-nav a{color:var(--green-lite);font-weight:600;font-size:.88rem}.site-nav a:hover{color:#fff;text-decoration:none}.nav-cta{font-family:var(--mono);font-weight:800;font-size:.72rem;letter-spacing:.06em;color:#1f211b!important;background:var(--amber);padding:9px 15px}.nav-cta:hover{background:var(--amber-bright);text-decoration:none}.site-footer{background:var(--green-dark);color:var(--green-lite);margin-top:0}.site-footer .inner{max-width:var(--maxw);margin:0 auto;padding:44px var(--pad) 30px}.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px}.foot-brand .b{display:inline-flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:1.1rem;letter-spacing:-.02em;margin-bottom:12px}.foot-brand p{max-width:34ch;color:var(--green-lite);font-size:.86rem;margin:0}.foot-col h2{font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.12em;color:var(--green-pale);margin:0 0 12px;font-weight:700}.foot-col a{display:block;color:var(--green-lite);font-size:.88rem;margin-bottom:9px}.foot-col a:hover{color:#fff}.foot-bottom{border-top:1px solid var(--green-rule)}.foot-bottom .inner{padding:16px var(--pad);font-family:var(--mono);font-size:.66rem;letter-spacing:.06em;color:var(--green-pale);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}.crumbs{font-family:var(--mono);font-size:.74rem;letter-spacing:.04em;color:var(--ink-soft);margin:0 0 18px}.crumbs a{color:var(--ink-soft)}.crumbs span{margin:0 6px;opacity:.5}.tank-grid{display:grid;grid-template-columns:.92fr 1.08fr;gap:36px;align-items:start}.tank-intro{margin-bottom:22px}.tank-intro h1{margin-bottom:14px}.inputs-box{border:2px solid var(--ink);background:var(--paper-lite)}.inputs-head{display:flex;justify-content:space-between;align-items:center;padding:11px 16px;border-bottom:2px solid var(--ink);background:var(--paper-dark);font-family:var(--mono);font-weight:700;font-size:.74rem;letter-spacing:.12em;color:var(--ink)}.inputs-head .muted{color:var(--ink-soft);font-weight:600}.inputs-body{padding:22px 20px}.inputs-body .lbl{font-family:var(--mono);font-weight:700;font-size:.74rem;letter-spacing:.1em;color:var(--ink-soft)}.stepper{display:flex;align-items:stretch;margin-top:13px}.stepper button{width:62px;min-height:62px;border:2px solid var(--ink);background:var(--paper-lite);color:var(--ink);font:700 2rem var(--font);line-height:1;cursor:pointer}.stepper button:last-child{background:var(--amber);color:var(--paper-lite)}.stepper button:hover{filter:brightness(.96)}.stepper .val{flex:1;text-align:center;border:2px solid var(--ink);border-left:none;border-right:none;background:var(--paper);display:flex;align-items:center;justify-content:center}.stepper .val b{font-family:var(--mono);font-weight:800;font-size:3.4rem;color:var(--ink)}.toggle-row{display:flex;gap:12px;margin-top:16px}.toggle-cell{flex:1;display:flex;flex-direction:column;align-items:flex-start;gap:5px;padding:12px 14px;border:2px solid var(--ink);cursor:pointer;background:var(--paper-lite);color:var(--ink-soft);font-family:var(--mono)}.toggle-cell .t{font-weight:700;font-size:.68rem;letter-spacing:.05em;text-transform:uppercase}.toggle-cell .state{font-weight:800;font-size:.8rem}.toggle-cell[aria-pressed=true]{background:var(--green);color:var(--paper-lite)}.toggle-cell.eff[aria-pressed=true]{background:var(--water)}.result-xl{border:2px solid var(--water);background:var(--paper-lite)}.result-xl .rhead{display:flex;justify-content:space-between;align-items:center;padding:10px 18px;background:var(--water);color:var(--paper-lite);font-family:var(--mono);font-weight:700;font-size:.74rem;letter-spacing:.14em}.result-xl .rbody{padding:26px 24px 24px}.result-xl .rtop{display:flex;align-items:flex-end;justify-content:space-between;flex-wrap:wrap;gap:12px}.result-xl .num{display:flex;align-items:baseline;gap:10px}.result-xl .num b{font-family:var(--mono);font-weight:800;font-size:clamp(3.5rem,9vw,6.5rem);line-height:.85;color:var(--ink);letter-spacing:-.03em}.result-xl .num span{font-family:var(--mono);font-weight:700;font-size:1.5rem;color:var(--ink-soft)}.result-xl .next{text-align:right}.result-xl .next .k{font-family:var(--mono);font-weight:600;font-size:.7rem;letter-spacing:.06em;color:var(--water)}.result-xl .next .v{font-family:var(--mono);font-weight:800;font-size:1.6rem;color:var(--ink)}.result-xl .why{font-size:.9rem;color:var(--ink-soft);margin:18px 0 0}.scale{margin:22px 0 6px}.scale-bar{position:relative;height:20px;background:var(--paper-dark);border:1px solid var(--line)}.scale-fill{position:absolute;top:0;bottom:0;left:0;background:var(--water);opacity:.22;transition:width .18s ease}.scale-marker{position:absolute;top:-6px;width:3px;height:32px;background:var(--amber);transition:left .18s ease}.scale-ticks{display:flex;justify-content:space-between;font-family:var(--mono);font-weight:600;font-size:.62rem;color:var(--ink-soft);margin-top:7px}.led{margin:18px 0 0;border-top:1px solid var(--line)}.led-row{display:flex;align-items:center;padding:9px 0;border-bottom:1px solid var(--line-soft)}.led-row .k{font-family:var(--mono);font-weight:600;font-size:.82rem;color:var(--ink-soft)}.led-row .v{font-family:var(--mono);font-weight:700;font-size:.82rem;color:var(--ink);font-variant-numeric:tabular-nums}.led-row .leader{flex:1;border-bottom:1px dotted var(--line);margin:0 10px;transform:translateY(-4px)}.led-row.total{border-bottom:none;padding-top:11px}.led-row.total .k{font-weight:800;color:var(--green);letter-spacing:.04em}.led-row.total .v{font-weight:800;font-size:1rem;color:var(--green)}.led-row.total .leader{border-bottom-color:var(--green)}.result-xl .flag,.result .flag{margin:12px 0 0;padding:9px 12px;background:#f6e4c8;border-left:3px solid var(--amber);color:#7a4f0c;font-size:.86rem}.calc{border:2px solid var(--ink);background:var(--paper-lite);box-shadow:var(--shadow);margin:4px 0 24px;max-width:860px}.calc-head{display:flex;justify-content:space-between;align-items:center;padding:11px 16px;border-bottom:2px solid var(--ink);background:var(--paper-dark);font-family:var(--mono);font-weight:700;font-size:.74rem;letter-spacing:.12em;color:var(--ink)}.calc-head .muted{color:var(--ink-soft);font-weight:600}.calc-body{padding:20px 18px}.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:flex;flex-direction:column;gap:6px}.field label{font-family:var(--mono);font-weight:700;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft)}.field .hint{font-family:var(--font);font-weight:400;font-size:.72rem;text-transform:none;letter-spacing:0;color:var(--ink-faint)}input[type=number],select{font:500 1rem var(--font);padding:10px 11px;border:1.5px solid var(--ink);border-radius:0;background:var(--paper-lite);color:var(--ink);width:100%}input[type=number]{font-family:var(--mono)}select:disabled{opacity:.45}.checks{display:flex;flex-direction:column;gap:10px;margin-top:14px}.checks label{display:flex;align-items:center;gap:10px;font-size:.95rem;cursor:pointer}.checks input{width:20px;height:20px;accent-color:var(--green)}.result{border:2px solid var(--water);background:var(--paper-lite);margin:18px 0;max-width:860px}.result .label{display:flex;justify-content:space-between;align-items:center;background:var(--water);color:var(--paper-lite);margin:0;padding:9px 16px;font-family:var(--mono);font-weight:700;font-size:.74rem;letter-spacing:.12em;text-transform:uppercase}.result .headline{font-family:var(--mono);font-weight:800;font-size:clamp(2.4rem,7vw,3.4rem);line-height:.95;color:var(--ink);letter-spacing:-.02em;margin:16px 16px 4px}.result .headline span{font-size:1rem;font-weight:700;color:var(--ink-soft)}.result .why{font-size:.9rem;color:var(--ink-soft);margin:12px 16px}.result .breakdown{margin:14px 16px;width:auto}.breakdown{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:.84rem;margin:4px 0}.breakdown td{padding:7px 0;border-bottom:1px solid var(--line-soft);color:var(--ink-soft)}.breakdown td:last-child{text-align:right;color:var(--ink);font-weight:700;font-variant-numeric:tabular-nums}.breakdown tr:last-child td{border-bottom:none}.result .breakdown tr:last-child td{font-weight:800;color:var(--green)}.prose{max-width:68ch}.prose ul{padding-left:1.2em}.formula-box{font-family:var(--mono);font-weight:600;font-size:.88rem;line-height:1.8;color:var(--ink);background:var(--paper-lite);border:1px solid var(--line);padding:16px 18px;margin:12px 0}.fig{display:block;width:100%;border:2px solid var(--ink);margin-top:14px}.fig-cap{font-family:var(--mono);font-weight:600;font-size:.66rem;letter-spacing:.05em;color:var(--ink-soft);margin:8px 0 0;text-transform:uppercase}.disclaimer-note{font-size:.85rem;color:var(--ink-soft);border-left:3px solid var(--amber);padding:4px 0 4px 12px;margin:16px 0}.guide-cta{font-size:.95rem;color:var(--ink-soft);border-left:3px solid var(--water);padding:8px 0 8px 14px;margin:20px 0 0}.guide-cta a{font-weight:700}.std-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:44px;align-items:center}.std-grid h2{margin-top:10px}.steps{display:flex;flex-direction:column;gap:10px;margin:14px 0;padding:0;list-style:none}.steps li{display:flex;align-items:center;gap:13px;padding:12px 14px;background:var(--paper-dark)}.steps .n{font-family:var(--mono);font-weight:800;font-size:.8rem;color:var(--paper-lite);background:var(--green);width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex:none}.hero{padding:8px 0 6px}.tool-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin:18px 0}.tool-card{display:block;background:var(--paper-lite);border:2px solid var(--ink);padding:20px;box-shadow:var(--shadow);transition:transform .12s ease}.tool-card:hover{transform:translateY(-2px);text-decoration:none}.tool-card .tag{font-family:var(--mono);font-size:.64rem;text-transform:uppercase;letter-spacing:.1em;color:var(--amber);font-weight:700}.tool-card h3{margin:6px 0;color:var(--ink)}.tool-card p{margin:0;font-size:.9rem;color:var(--ink-soft)}.faq h2{margin-bottom:8px}.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:0 56px;margin-top:14px}.faq details{border-bottom:1px solid var(--line)}.faq summary{font-weight:700;cursor:pointer;padding:14px 0;list-style:none;display:flex;gap:10px}.faq summary::-webkit-details-marker{display:none}.faq summary:before{content:"+";font-family:var(--mono);color:var(--amber);font-weight:700}.faq details[open] summary:before{content:"–"}.faq details p{margin:0 0 14px;color:var(--ink-soft)}.related{margin:28px 0 48px}.related h2{font-family:var(--mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);font-weight:700;margin:0 0 16px}.related ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;align-items:stretch}.related li{display:flex}.related a{flex:1;display:flex;flex-direction:column;justify-content:space-between;min-height:110px;gap:14px;padding:18px;border:2px solid var(--ink);background:var(--paper-lite);font-weight:700;font-size:1rem;color:var(--ink)}.related a:hover{text-decoration:none;background:var(--paper-dark)}.related a:after{content:"→";font-family:var(--mono);color:var(--water);font-weight:700}.ad-slot{margin:0;min-height:90px;display:flex;align-items:center;justify-content:center;border:1.5px dashed var(--line);color:var(--ink-faint);background:var(--paper-ad);font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase}button.btn,.btn{display:inline-block;font:700 1rem var(--font);cursor:pointer;border:2px solid var(--ink);background:var(--green);color:var(--paper-lite);padding:11px 18px}.btn:hover{filter:brightness(1.1);text-decoration:none}.stack>*+*{margin-top:0}.calc-2col{display:grid;grid-template-columns:.9fr 1.1fr;gap:30px;align-items:start;margin:18px 0 24px}.field-block{margin-top:16px}.field-block:first-child{margin-top:0}.field-block .lbl{font-family:var(--mono);font-weight:700;font-size:.72rem;letter-spacing:.1em;color:var(--ink-soft)}.helper{font-family:var(--mono);font-weight:600;font-size:.7rem;color:var(--ink-faint);margin-top:12px}.stepper.sm button{width:48px;min-height:48px;font-size:1.5rem}.stepper.sm .val b{font-size:2.4rem}.result-xl .rtop .unit{font-family:var(--mono);font-weight:700;font-size:1.1rem;color:var(--ink-soft)}.result-xl.md .num b{font-size:clamp(3rem,8vw,4.9rem)}.result-xl.sm .num b{font-size:clamp(2.2rem,6vw,2.9rem)}.chip{font-family:var(--mono);font-weight:800;font-size:.78rem;letter-spacing:.06em;padding:8px 12px;color:var(--paper-lite);align-self:center}.chip.rapid{background:var(--amber)}.chip.suitable{background:var(--green)}.chip.slow{background:var(--water)}.chip.unsuitable{background:#8a4b3a}.perc-scale{margin:20px 0 6px}.perc-seg{position:relative;height:18px;display:flex;border:1px solid var(--line)}.perc-seg>i{display:block;opacity:.7}.perc-seg .marker{position:absolute;top:-5px;width:3px;height:28px;background:var(--ink);transition:left .18s ease}.perc-ticks{display:flex;justify-content:space-between;font-family:var(--mono);font-weight:600;font-size:.55rem;letter-spacing:.04em;color:var(--ink-soft);margin-top:6px}.cost-bar{display:flex;height:22px;margin:18px 0 8px;border:1px solid var(--line);overflow:hidden}.cost-bar>i{display:block;transition:width .18s ease}.cost-legend{display:flex;flex-wrap:wrap;gap:8px 18px;font-family:var(--mono);font-weight:600;font-size:.6rem;letter-spacing:.04em;color:var(--ink-soft)}.cost-legend span{display:flex;align-items:center;gap:5px}.cost-legend i{width:9px;height:9px;display:block}.type-row{display:flex;gap:8px;margin-top:10px}.type-row button{flex:1;padding:11px 6px;border:2px solid var(--ink);cursor:pointer;font-family:var(--mono);font-weight:800;font-size:.66rem;letter-spacing:.04em;background:var(--paper-lite);color:var(--ink-soft)}.type-row button[aria-pressed=true]{background:var(--green);color:var(--paper-lite)}.photo-ph{position:relative;overflow:hidden;background:#ddc89a}.photo-ph svg{display:block;width:100%;height:100%;position:absolute;inset:0}.photo-ph .tag{position:absolute;left:12px;bottom:12px;z-index:1;font-family:var(--mono);font-weight:600;font-size:.56rem;letter-spacing:.1em;color:var(--green);background:#fbf8efd9;padding:5px 9px;border:1px solid var(--line)}.cat{font-family:var(--mono);font-weight:700;font-size:.64rem;letter-spacing:.1em;text-transform:uppercase}.cat--sizing{color:var(--green)}.cat--soil{color:var(--water)}.cat--maint{color:var(--amber)}.cat--cost{color:#8a4b3a}.cat--reg{color:var(--green)}.read{font-family:var(--mono);font-weight:600;font-size:.64rem;color:var(--ink-faint)}.filter-pills{display:flex;flex-wrap:wrap;gap:9px;margin:4px 0 26px}.pill{font-family:var(--mono);font-weight:700;font-size:.7rem;letter-spacing:.05em;text-transform:uppercase;padding:9px 15px;border:2px solid var(--ink);background:var(--paper-lite);color:var(--ink-soft);cursor:pointer}.pill[aria-pressed=true]{background:var(--ink);color:var(--paper-lite)}.featured-card{display:grid;grid-template-columns:1fr 1fr;border:2px solid var(--ink);background:var(--paper-lite);margin-bottom:24px}.featured-card:hover{text-decoration:none}.featured-card .photo-ph{min-height:280px;border-right:2px solid var(--ink)}.featured-card .fc-body{padding:28px 26px;display:flex;flex-direction:column;justify-content:center}.featured-card h2{margin:12px 0;font-size:clamp(1.5rem,2.4vw,1.9rem)}.featured-card p{color:var(--ink-soft);margin:0 0 16px}.go{font-family:var(--mono);font-weight:800;font-size:.8rem;color:var(--water)}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.guide-card{display:flex;flex-direction:column;border:2px solid var(--ink);background:var(--paper-lite);transition:transform .12s ease}.guide-card:hover{text-decoration:none;transform:translateY(-2px)}.guide-card .photo-ph{height:150px;border-bottom:2px solid var(--ink)}.guide-card .gc-body{padding:16px 16px 18px;display:flex;flex-direction:column;flex:1}.guide-card h3{margin:9px 0 8px;font-size:1.1rem;line-height:1.2;color:var(--ink)}.guide-card p{font-size:.85rem;color:var(--ink-soft);margin:0 0 14px;flex:1}.article-cr{font-family:var(--mono);font-weight:600;font-size:.7rem;letter-spacing:.06em;color:var(--ink-faint);margin-bottom:16px;text-transform:uppercase}.article-dek{font-size:1.15rem;color:var(--ink-soft);max-width:60ch;margin:12px 0 18px}.article-meta{display:flex;flex-wrap:wrap;gap:10px;font-family:var(--mono);font-weight:600;font-size:.7rem;color:var(--ink-faint);padding-bottom:22px;border-bottom:2px solid var(--ink);text-transform:uppercase}.article-grid{display:grid;grid-template-columns:1fr 300px;gap:44px;align-items:start;margin-top:26px}.article-photo{height:230px;border:2px solid var(--ink);margin-bottom:24px}.article-body h2{font-size:1.5rem;margin:1.5em 0 .5em;scroll-margin-top:80px}.article-body p,.article-body ul{font-size:1.05rem;line-height:1.7;color:#33342b}.a-formula{font-family:var(--mono);font-weight:600;font-size:.9rem;line-height:1.9;color:var(--ink);background:var(--paper-lite);border:2px solid var(--ink);border-left:6px solid var(--water);padding:18px 20px;margin:0 0 20px}.a-rule{border-left:6px solid var(--amber);background:var(--paper-ad);padding:16px 18px;margin:4px 0 22px}.a-rule .h{font-family:var(--mono);font-weight:700;font-size:.7rem;letter-spacing:.1em;color:var(--amber-dark, #9c6313);margin-bottom:7px;text-transform:uppercase}.a-standard{display:flex;gap:13px;align-items:flex-start;border:2px solid var(--ink);background:var(--paper-lite);padding:16px 18px;margin:4px 0 8px}.a-standard .lbl{font-family:var(--mono);font-weight:800;font-size:.72rem;color:var(--paper-lite);background:var(--green);padding:6px 9px;flex-shrink:0}.a-standard p{margin:0;font-size:.92rem}.a-table{border:2px solid var(--ink);background:var(--paper-lite);margin:4px 0 20px}.a-table .row{display:flex;justify-content:space-between;padding:11px 16px;border-bottom:1px solid var(--line-soft);font-family:var(--mono);font-weight:700;font-size:.82rem;color:var(--ink)}.a-table .row:last-child{border-bottom:none}.aside{display:flex;flex-direction:column;gap:20px;position:sticky;top:18px}.toc{border:2px solid var(--ink);background:var(--paper-lite)}.toc .h{padding:11px 15px;border-bottom:2px solid var(--ink);background:var(--paper-dark);font-family:var(--mono);font-weight:700;font-size:.66rem;letter-spacing:.1em;text-transform:uppercase}.toc .links{padding:14px 16px;display:flex;flex-direction:column;gap:11px}.toc a{font-size:.84rem;color:var(--water);font-weight:600}.calc-card{display:block;border:2px solid var(--water);background:var(--paper-lite)}.calc-card:hover{text-decoration:none}.calc-card .h{background:var(--water);color:var(--paper-lite);padding:9px 15px;font-family:var(--mono);font-weight:700;font-size:.66rem;letter-spacing:.1em}.calc-card .b{padding:18px 16px}.calc-card .cc-num{display:flex;align-items:baseline;gap:6px;margin:4px 0 2px}.calc-card .cc-num b{font-family:var(--mono);font-weight:800;font-size:2.6rem;color:var(--ink);letter-spacing:-.02em}.calc-card .cc-num span{font-family:var(--mono);font-weight:700;font-size:.9rem;color:var(--ink-soft)}.related-guides{border-top:3px solid var(--ink);padding-top:26px;margin:8px 0 48px}.lp-dark{background:var(--green-dark);color:#fbf8ef}.lp-band{background:var(--paper-dark);border-top:3px solid var(--ink)}.lp-hero-grid{display:grid;grid-template-columns:1.04fr .96fr;gap:48px;align-items:center;padding:60px 0 54px}.lp-hero .eyebrow{color:var(--green-pale)}.lp-hero h1{font-size:clamp(2.4rem,5vw,3.6rem);color:#fbf8ef;line-height:1;letter-spacing:-.035em;margin:18px 0 20px}.lp-hero .lede{color:#cdd3bc;font-size:1.12rem;max-width:460px}.hero-chips{display:flex;flex-wrap:wrap;gap:9px;margin:0 0 30px}.hero-chips span{font-family:var(--mono);font-weight:600;font-size:.7rem;letter-spacing:.04em;color:#e9e1cd;border:1px solid #4a5c32;padding:7px 12px}.btn-amber{display:inline-block;font-family:var(--mono);font-weight:800;font-size:.8rem;letter-spacing:.06em;color:#1f211b;background:var(--amber);padding:14px 22px}.btn-amber:hover{background:var(--amber-bright);text-decoration:none}.hero-calc{border:2px solid #11160c;background:var(--paper-lite);box-shadow:0 18px 40px #00000052}.hero-calc .hc-head{display:flex;justify-content:space-between;align-items:center;padding:11px 18px;background:var(--water);color:#fbf8ef;font-family:var(--mono);font-weight:700;font-size:.72rem;letter-spacing:.12em}.hero-calc .hc-body{padding:22px}.strata-edge i{display:block;height:6px}.dir-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.dir-card{display:flex;flex-direction:column;border:2px solid var(--ink);background:var(--paper-lite);padding:22px;transition:transform .12s ease}.dir-card:hover{text-decoration:none;transform:translateY(-2px)}.dir-card h3{font-size:1.3rem;font-weight:800;letter-spacing:-.02em;color:var(--ink);margin:9px 0 6px}.dir-card p{font-size:.86rem;line-height:1.5;color:var(--ink-soft);margin:0 0 18px;flex:1}.dir-card.method{background:var(--green-dark);color:#fbf8ef;justify-content:center}.dir-card.method h3{color:#fbf8ef}.dir-card.method p{color:#cdd3bc}.open{font-family:var(--mono);font-weight:800;font-size:.75rem;color:var(--water)}.tcards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.tcard{border:2px solid var(--ink);background:var(--paper-lite);padding:24px}.tcard .tnum{font-family:var(--mono);font-weight:800;font-size:1.8rem}.tcard h3{font-size:1.2rem;font-weight:800;letter-spacing:-.02em;margin:12px 0 8px}.tcard p{font-size:.9rem;color:var(--ink-soft);margin:0 0 14px}.tsnip{font-family:var(--mono);font-weight:600;font-size:.7rem;line-height:1.7;color:var(--ink);background:var(--paper);padding:11px 13px}.lp-head-row{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:24px;gap:16px;flex-wrap:wrap}@media(max-width:900px){:root{--pad: 22px}.tank-grid,.calc-2col,.std-grid,.foot-grid{grid-template-columns:1fr;gap:24px}.faq-list{grid-template-columns:1fr;gap:0}.guide-grid{grid-template-columns:1fr 1fr}.lp-hero-grid,.dir-grid,.tcards{grid-template-columns:1fr;gap:24px}.featured-card,.article-grid{grid-template-columns:1fr}.featured-card .photo-ph{border-right:none;border-bottom:2px solid var(--ink);min-height:180px}.aside{position:static}}@media(max-width:680px){.guide-grid{grid-template-columns:1fr}}@media(max-width:680px){.calc-grid{grid-template-columns:1fr}.toggle-row{flex-direction:column}.site-nav{display:none}h1{font-size:clamp(1.8rem,7vw,2.2rem)}}@media(prefers-reduced-motion:reduce){.scale-fill,.scale-marker{transition:none}}