.tank-calc-wrapper{width:100%;margin-inline:auto}.tank-calc{display:grid;grid-template-columns:264px minmax(0,1fr) minmax(0,1.15fr);grid-template-areas:"picker inputs stage" "picker details stage";gap:0;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:0 4px 20px #0f1b2d14;overflow:hidden}.tank-calc .calc-picker{grid-area:picker;border:none;margin:0;padding:20px 16px;background:#fafbfa;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:14px}.tank-calc .picker-legend{font-size:13px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px;display:block;width:100%}.tank-calc .shape-cards{display:flex;flex-direction:column;gap:6px}.tank-calc .shape-card{cursor:pointer;position:relative;user-select:none}.tank-calc .shape-card input{position:absolute;opacity:0;pointer-events:none}.tank-calc .shape-card-inner{display:flex;align-items:center;gap:10px;padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-size:14px;font-weight:500;transition:all .15s ease}.tank-calc .shape-icon{width:22px;height:22px;flex-shrink:0;color:var(--ink-2)}.tank-calc .shape-card:hover .shape-card-inner{border-color:var(--brass-lt);background:#fff}.tank-calc .shape-card input:focus-visible+.shape-card-inner{outline:2px solid var(--brass);outline-offset:1px}.tank-calc .shape-card input:checked+.shape-card-inner{border-color:var(--brass);background:#b8894a14;color:var(--navy);font-weight:600}.tank-calc .shape-card input:checked+.shape-card-inner .shape-icon{color:var(--brass-dk)}.tank-calc .oval-type-wrap{padding-top:10px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:8px}.tank-calc .picker-subtitle{font-size:12px;font-weight:600;color:var(--muted)}.tank-calc .seg-control{display:grid;grid-template-columns:repeat(2,1fr);background:#ebece8;padding:3px;border-radius:8px;gap:2px}.tank-calc .seg-control input{position:absolute;opacity:0;pointer-events:none}.tank-calc .seg-control label{padding:6px 8px;font-size:12px;text-align:center;border-radius:6px;cursor:pointer;color:var(--ink-2);transition:all .15s ease;user-select:none;line-height:1.2}.tank-calc .seg-control input:checked+label{background:var(--surface);color:var(--ink);font-weight:600;box-shadow:0 1px 3px #0000001a}.tank-calc .seg-control input:focus-visible+label{outline:2px solid var(--brass)}.tank-calc .picker-hint{font-size:11.5px;color:var(--muted);margin:0;line-height:1.35}.tank-calc .calc-inputs{grid-area:inputs;border:none;margin:0;padding:24px 20px;background:var(--surface);display:flex;flex-direction:column;gap:14px}.tank-calc .inputs-grid{display:flex;flex-direction:column;gap:14px}.tank-calc .field{display:flex;flex-direction:column;gap:4px}.tank-calc .field-label-row{display:flex;justify-content:space-between;align-items:center}.tank-calc .field label{font-size:13.5px;font-weight:600;color:var(--ink)}.tank-calc .btn-clear{background:none;border:none;padding:0;font-size:12px;color:var(--brass-dk);cursor:pointer;text-decoration:underline}.tank-calc .btn-clear:hover{color:var(--ink)}.tank-calc .pair{display:grid;grid-template-columns:minmax(0,1fr) 72px;border:1px solid var(--line-2);border-radius:8px;background:#fff;overflow:hidden;transition:border-color .15s ease}.tank-calc .pair:focus-within{border-color:var(--brass);box-shadow:0 0 0 2px #b8894a33}.tank-calc .pair input{border:none;padding:8px 12px;font-size:15px;color:var(--ink);background:transparent;font-family:inherit;outline:none;width:100%}.tank-calc .pair select{border:none;border-left:1px solid var(--line);background:#f7f8f6;padding:8px 4px 8px 8px;font-size:13px;font-weight:500;color:var(--ink-2);cursor:pointer;outline:none}.tank-calc .field-hint{font-size:12px;color:var(--muted);line-height:1.35}.tank-calc .field-error{font-size:12px;color:#c92a2a;display:none}.tank-calc .field-error.active{display:block}.tank-calc .slider-field{padding-top:6px;display:flex;flex-direction:column;gap:6px}.tank-calc .slider-label-row{display:flex;justify-content:space-between;font-size:12.5px;font-weight:600;color:var(--ink-2)}.tank-calc .slider-val{color:var(--brass-dk);font-variant-numeric:tabular-nums}.tank-calc input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:3px;background:var(--line);outline:none}.tank-calc input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--brass);cursor:pointer;border:2px solid #ffffff;box-shadow:0 1px 3px #0003}.tank-calc input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--brass);cursor:pointer;border:2px solid #ffffff;box-shadow:0 1px 3px #0003}.tank-calc .calc-shape-hint{padding:8px 12px;border-radius:6px;background:#fdf5ea;border:1px solid var(--brass-lt);color:var(--brass-dk);font-size:12px;line-height:1.35}.tank-calc .calc-details{grid-area:details;padding:16px 20px 24px;background:#fafbfa;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:10px}.tank-calc .details-title{font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.tank-calc .details-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.tank-calc .detail-cell{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:8px 10px;text-align:left;display:flex;flex-direction:column;gap:2px;cursor:pointer;transition:all .15s ease}.tank-calc .detail-cell:hover:not(.static-cell){border-color:var(--brass);background:#fff}.tank-calc .detail-cell.static-cell{cursor:default;background:#f4f5f2}.tank-calc .detail-label{font-size:11px;color:var(--muted);font-weight:500}.tank-calc .detail-val{font-size:13.5px;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}.tank-calc .details-note{font-size:11px;color:var(--muted);margin:0}.tank-calc .calc-stage{grid-area:stage;background:var(--navy);color:#fff;padding:24px 24px 20px;display:flex;flex-direction:column;gap:18px;position:relative;border-left:1px solid rgba(255,255,255,.08);--water-fill: rgba(221, 188, 136, .22);--water-line: var(--brass-lt);--edge: rgba(255, 255, 255, .85);--dim-edge: rgba(255, 255, 255, .35)}.tank-calc .stage-result-block{display:flex;flex-direction:column;gap:8px;padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.12)}.tank-calc .stage-result-top{display:flex;justify-content:space-between;align-items:center}.tank-calc .stage-result-label{font-size:13px;font-weight:600;color:var(--brass-lt);text-transform:uppercase;letter-spacing:.05em}.tank-calc .btn-copy{display:inline-flex;align-items:center;gap:6px;background:#ffffff14;border:1px solid rgba(255,255,255,.16);color:#fff;font-size:12px;font-weight:500;padding:4px 10px;border-radius:6px;cursor:pointer;transition:background .15s ease}.tank-calc .btn-copy:hover{background:#ffffff26}.tank-calc .ico-copy{width:14px;height:14px}.tank-calc .stage-big-number-row{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.tank-calc .big-number{font-family:var(--serif);font-size:clamp(34px,4vw,42px);font-weight:600;color:#fff;line-height:1.05;font-variant-numeric:tabular-nums}.tank-calc .select-result-unit{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#fff;border-radius:6px;padding:4px 8px;font-size:14px;font-weight:500;cursor:pointer;outline:none}.tank-calc .select-result-unit option{background:var(--navy);color:#fff}.tank-calc .liquid-result-rows{display:flex;flex-direction:column;gap:4px;padding-top:4px}.tank-calc .result-row{display:flex;justify-content:space-between;font-size:13.5px;color:#d6dee7}.tank-calc .result-row .row-val{font-weight:600;color:#fff;font-variant-numeric:tabular-nums}.tank-calc .worked-line{font-family:var(--serif);font-size:13.5px;color:var(--brass-lt);padding-top:4px;line-height:1.4}.tank-calc .stage-drawing-figure{margin:0;display:flex;flex-direction:column;align-items:center;gap:8px}.tank-calc .svg-container{width:100%;max-width:440px;display:flex;justify-content:center}.tank-calc .stage-caption{font-size:12px;color:#d6dee7d9;text-align:center;line-height:1.35}.tank-calc svg .e{stroke:#ffffffd9;stroke-width:1.5;fill:none}.tank-calc svg .e-dash{stroke:#fff6;stroke-width:1.2;fill:none}.tank-calc svg .dim line.d{stroke:var(--brass);stroke-width:1.2}.tank-calc svg .dim line.x{stroke:#ddbc8866;stroke-width:1;stroke-dasharray:2,2}.tank-calc svg .dim .pill rect{fill:var(--navy);stroke:var(--brass);stroke-width:1.2;cursor:pointer}.tank-calc svg .dim .pill text{fill:var(--brass-lt);font-weight:600;cursor:pointer}.tank-calc svg .dim:hover .pill rect,.tank-calc svg .dim.is-hot .pill rect{fill:var(--brass);stroke:#fff}.tank-calc svg .dim:hover .pill text,.tank-calc svg .dim.is-hot .pill text{fill:var(--navy)}.tank-chart-panel{margin-top:24px;background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:0 2px 10px #0f1b2d0a}.tank-chart-panel .chart-summary{padding:16px 20px;font-size:16px;font-weight:600;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;background:#fafbfa;user-select:none;list-style:none}.tank-chart-panel .chart-summary::-webkit-details-marker{display:none}.tank-chart-panel .summary-chevron{font-size:14px;color:var(--muted);transition:transform .2s ease}.tank-chart-panel[open] .summary-chevron{transform:rotate(180deg)}.tank-chart-panel .chart-panel-content{padding:20px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:16px}.tank-chart-panel .chart-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;padding-bottom:14px;border-bottom:1px solid var(--line)}.tank-chart-panel .toolbar-item{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--ink-2);font-weight:500}.tank-chart-panel .toolbar-item select{border:1px solid var(--line-2);border-radius:6px;padding:6px 10px;font-size:13.5px;background:#fff;color:var(--ink);cursor:pointer}.tank-chart-panel .toolbar-actions{display:flex;gap:10px}.tank-chart-panel .btn-tool{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border:1px solid var(--line-2);border-radius:6px;background:#fff;color:var(--ink);font-size:13px;font-weight:500;cursor:pointer;transition:all .15s ease}.tank-chart-panel .btn-tool:hover{border-color:var(--brass);color:var(--brass-dk)}.tank-chart-panel .ico-btn{width:16px;height:16px}.tank-chart-panel .chart-table-wrap{overflow-x:auto}.tank-chart-panel .tank-chart-table{width:100%;border-collapse:collapse;font-size:14px}.tank-chart-panel .tank-chart-table th,.tank-chart-panel .tank-chart-table td{padding:10px 14px;border-bottom:1px solid var(--line);text-align:left}.tank-chart-panel .tank-chart-table th{background:#f7f8f6;font-weight:600;color:var(--ink)}.tank-chart-panel .tank-chart-table td.num,.tank-chart-panel .tank-chart-table th:nth-child(2),.tank-chart-panel .tank-chart-table th:nth-child(3){text-align:right;font-variant-numeric:tabular-nums}@media(min-width:760px)and (max-width:1099px){.tank-calc{grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);grid-template-areas:"picker picker" "inputs stage" "details stage"}.tank-calc .calc-picker{border-right:none;border-bottom:1px solid var(--line);padding:10px 18px}.tank-calc .shape-cards{display:flex;flex-direction:row;flex-wrap:nowrap;overflow-x:auto;scroll-snap-type:x proximity;scrollbar-width:thin;padding-bottom:4px;gap:6px}.tank-calc .shape-card{flex:0 0 auto;min-width:auto}.tank-calc .shape-card-inner{padding:6px 10px;font-size:13px;white-space:nowrap}}@media(max-width:759px){.tank-calc{grid-template-columns:1fr;grid-template-areas:"picker" "inputs" "stage" "details";border-radius:12px}.tank-calc .calc-picker{border-right:none;border-bottom:1px solid var(--line);padding:10px 14px}.tank-calc .picker-legend{display:none}.tank-calc .shape-cards{display:flex;flex-direction:row;flex-wrap:nowrap;overflow-x:auto;scroll-snap-type:x proximity;scrollbar-width:thin;padding-bottom:4px;gap:6px}.tank-calc .shape-card{flex:0 0 auto;min-width:auto}.tank-calc .shape-card-inner{padding:6px 10px;font-size:13px;white-space:nowrap}.tank-calc .calc-stage{border-left:none;border-top:1px solid rgba(255,255,255,.08);padding:20px 16px}.tank-calc .calc-inputs{padding:20px 16px}.tank-calc .calc-details{padding:16px}.tank-chart-panel .chart-toolbar{flex-direction:column;align-items:stretch}}@media print{body *{visibility:hidden}#chart-print-area,#chart-print-area *{visibility:visible}#chart-print-area{position:absolute;left:0;top:0;width:100%}.print-header{display:block!important;margin-bottom:20px}}.tank-hero-band{background:var(--navy);color:#fff;padding:16px 0 44px;position:relative;box-shadow:0 1px #ffffff14 inset}.tank-hero-band:after{content:"";position:absolute;left:0;right:0;bottom:0;height:140px;background:var(--bg);z-index:1;pointer-events:none}.tank-hero-band .wrap{position:relative;z-index:2}.hero-text{max-width:860px;margin:0 auto 20px;text-align:center;display:flex;flex-direction:column;align-items:center}.hero-text h1{font-family:var(--serif);font-size:clamp(34px,4.5vw,44px);line-height:1.15;font-weight:400;color:#fff;margin:0 0 8px;letter-spacing:-.015em;text-align:center}.hero-text .lede{font-size:18px;line-height:1.55;color:#d6dee7;margin:0 auto;max-width:760px}@media(max-width:1099px){.tank-hero-band{padding-top:6px}.hero-text{margin-bottom:6px}.hero-text h1{font-size:28px;margin-bottom:4px}.hero-text .lede{font-size:14.5px;line-height:1.35}:global(body:has(#tank-calculator) .breadcrumbs){padding-block:4px}}@media(max-width:760px){.tank-hero-band{padding:10px 0 24px}.hero-text{margin:0 auto 10px}.hero-text h1{font-size:28px;margin-bottom:4px}.hero-text .lede{font-size:14.5px;line-height:1.35}}.tank-content-flow{padding-bottom:64px;max-width:1040px;margin-inline:auto;width:100%;padding-inline:24px;box-sizing:border-box}.tank-content-flow .wrap{max-width:100%;padding-inline:0;margin-inline:auto;width:100%}.intro-wrap{padding-top:40px;padding-bottom:12px}.section-wrap{padding-top:40px}.prose{max-width:100%;width:100%;margin-inline:auto;color:var(--ink-2);font-size:16.5px;line-height:1.65}.intro-lede{font-size:19px;line-height:1.55;color:var(--ink);margin-bottom:14px;max-width:100%!important;text-align:center}.intro-wrap .prose p:last-child{text-align:center;max-width:100%!important}.prose h2{font-family:var(--serif);font-size:clamp(26px,3.2vw,34px);font-weight:600;color:var(--ink);margin:40px 0 18px;line-height:1.25;letter-spacing:-.01em;text-align:center}.prose h3{font-family:var(--serif);font-size:21px;font-weight:600;color:var(--ink);margin:32px 0 12px;line-height:1.3;text-align:start}.prose p{margin:0 0 14px;max-width:100%!important;width:100%}.prose ul,.prose ol{margin:0 0 18px;padding-left:28px;max-width:100%!important;width:100%}.prose li{margin-bottom:8px;max-width:100%!important}.prose a{color:var(--navy);font-weight:500;text-decoration:underline;text-underline-offset:2px}.prose a:hover{color:var(--brass-dk)}.formula-box{width:100%;max-width:100%;box-sizing:border-box;background:var(--surface);border:1px solid var(--line-2);border-left:4px solid var(--brass);border-radius:8px;padding:16px 20px;margin:18px 0;box-shadow:0 1px 3px #0f1b2d08}.formula-line{font-family:var(--serif);font-size:17px;font-weight:600;color:var(--ink);margin:0 0 6px}.formula-desc{font-size:13.5px;color:var(--muted);margin-top:4px}.btn-load{display:inline-block;background:var(--surface);border:1px solid var(--brass);color:var(--brass-dk);font-size:13px;font-weight:600;padding:6px 14px;border-radius:6px;cursor:pointer;margin:6px 0 18px;transition:all .15s ease}.btn-load:hover{background:var(--brass);color:#fff}.btn-load-sm{background:var(--surface);border:1px solid var(--line-2);color:var(--brass-dk);font-size:12px;font-weight:600;padding:3px 8px;border-radius:4px;cursor:pointer;transition:all .15s ease}.btn-load-sm:hover{border-color:var(--brass);background:var(--brass);color:#fff}.btn-table-shape{background:none;border:none;padding:0;color:var(--navy);font-size:inherit;font-weight:600;text-decoration:underline;cursor:pointer;text-align:left}.btn-table-shape:hover{color:var(--brass-dk)}.table-wrap{width:100%;max-width:100%;margin:20px auto;overflow-x:auto}.content-table{width:100%;border-collapse:collapse;font-size:14.5px;background:var(--surface);border:1px solid var(--line);border-radius:8px;overflow:hidden}.content-table caption{caption-side:top;text-align:left;font-size:14.5px;font-weight:600;color:var(--ink);margin-bottom:8px}.content-table th,.content-table td{padding:10px 14px;border-bottom:1px solid var(--line)}.content-table th{background:#f7f8f6;font-weight:600;color:var(--ink)}.content-table td.num{text-align:right;font-variant-numeric:tabular-nums}.content-figure,.prose figure{width:100%;max-width:100%;margin:24px auto;display:flex;flex-direction:column;align-items:center;gap:8px}.content-figure .figure-svg-wrap{width:100%;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px;display:flex;justify-content:center;box-shadow:0 1px 3px #0f1b2d08}.content-figure figcaption{font-size:13px;color:var(--muted);text-align:center;line-height:1.4}.content-figure svg,.prose figure 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rgba(184,137,74,.15))}.scale-tank-item{transition:transform .2s ease;cursor:pointer;outline:none}.scale-tank-item:hover,.scale-tank-item:focus-visible{filter:drop-shadow(0 4px 10px rgba(184,137,74,.25))}.scale-tank-item:hover .e,.scale-tank-item:focus-visible .e{stroke:var(--brass-dk);stroke-width:2}.weight-bar-row{cursor:pointer;outline:none;transition:opacity .15s ease}.weight-bar-row:hover .bar-fill,.weight-bar-row:focus-visible .bar-fill,.weight-bar-row.is-active .bar-fill{stroke:var(--brass-dk);stroke-width:1.5;filter:brightness(1.1)}.hs-preset-btn{cursor:pointer;outline:none;transition:all .15s ease}.hs-preset-btn:hover .preset-bg,.hs-preset-btn:focus-visible .preset-bg{stroke:var(--brass);stroke-width:2;fill:#fdfbf7}.hs-preset-btn.is-active .preset-bg{stroke:var(--brass-dk);stroke-width:2;fill:#fdfbf7}.strap-point-row{cursor:pointer;outline:none;transition:all .15s ease}.strap-point-row:hover .row-bg,.strap-point-row:focus-visible .row-bg{stroke:var(--brass);stroke-width:1.5;fill:#fdfbf7}.strap-point-row.is-active .row-bg{stroke:var(--brass-dk);stroke-width:2;fill:#fdfbf7}.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;width:100%;max-width:100%;margin:20px auto 0}.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;transition:all .15s ease}.tool-card:hover{border-color:var(--brass);box-shadow:0 4px 12px #0f1b2d0f}.tool-link{display:flex;flex-direction:column;padding:16px;height:100%;text-decoration:none;color:inherit;position:relative}.tool-title{font-family:var(--serif);font-size:17px;font-weight:600;color:var(--navy);margin-bottom:4px}.tool-desc{font-size:13px;color:var(--muted);line-height:1.4}.tool-link.disabled{cursor:default}.soon-badge{position:absolute;top:12px;right:12px;font-size:10px;font-weight:600;background:#ebece8;color:var(--muted);padding:2px 6px;border-radius:4px;opacity:0;transition:opacity .15s ease}.tool-card:hover .soon-badge,.tool-card:focus-within .soon-badge{opacity:1}@media(max-width:759px){.tools-grid{grid-template-columns:1fr}}.faq{display:flex;flex-direction:column;gap:12px;margin-top:18px;width:100%;max-width:100%}.faq details{background:var(--surface);border:1px solid var(--line);border-radius:8px;overflow:hidden}.faq summary{padding:16px 20px;font-family:var(--sans);font-size:16px;font-weight:600;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;user-select:none;list-style:none;transition:background .15s}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";font-size:20px;color:var(--brass-dk);font-weight:400;transition:transform .2s}.faq details[open] summary:after{transform:rotate(45deg)}.faq details[open] summary{border-bottom:1px solid var(--line)}.faq-answer{padding:14px 20px 16px;font-size:15px;line-height:1.6;color:var(--ink-2)}.faq-answer p{margin:0}.sources-list{font-size:14px;line-height:1.6;color:var(--muted);padding-left:20px}.sources-list li{margin-bottom:8px}.sources-list a{color:var(--navy);font-weight:500}.review-note-wrap{margin-top:40px}.review-note{background:#f7f8f6;border:1px solid var(--line);border-radius:8px;padding:12px 18px}.review-note p{font-size:14px;line-height:1.5;color:var(--muted);margin:0}.review-note a{color:var(--navy);font-weight:500;text-decoration:underline}