.pointer-events-none{pointer-events:none}
.fixed{position:fixed}
.absolute{position:absolute}
.relative{position:relative}
.inset-0{inset:0px}
.bottom-full{bottom:100%}
.left-1\/2{left:50%}
.z-10{z-index:10}
.z-50{z-index:50}
.m-auto{margin:auto}
.mx-auto{margin-left:auto;margin-right:auto}
.my-2{margin-top:0.5rem;margin-bottom:0.5rem}
.mb-1{margin-bottom:0.25rem}
.mb-1\.5{margin-bottom:0.375rem}
.mb-2{margin-bottom:0.5rem}
.mb-4{margin-bottom:1rem}
.ml-2{margin-left:0.5rem}
.ml-24{margin-left:6rem}
.ml-44{margin-left:11rem}
.ml-auto{margin-left:auto}
.mt-0\.5{margin-top:0.125rem}
.mt-4{margin-top:1rem}
.block{display:block}
.flex{display:flex}
.table{display:table}
.grid{display:grid}
.hidden{display:none}
.h-3\.5{height:0.875rem}
.h-8{height:2rem}
.h-9{height:2.25rem}
.w-10{width:2.5rem}
.w-12{width:3rem}
.w-14{width:3.5rem}
.w-16{width:4rem}
.w-20{width:5rem}
.w-24{width:6rem}
.w-3\.5{width:0.875rem}
.w-40{width:10rem}
.w-8{width:2rem}
.w-9{width:2.25rem}
.w-full{width:100%}
.min-w-0{min-width:0px}
.max-w-3xl{max-width:48rem}
.max-w-\[120px\]{max-width:120px}
.max-w-md{max-width:28rem}
.max-w-xs{max-width:20rem}
.flex-1{flex:1 1 0%}
.shrink-0{flex-shrink:0}
.-translate-x-1\/2{--tw-translate-x:-50%;transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}
.transform{transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}
.flex-col{flex-direction:column}
.flex-wrap{flex-wrap:wrap}
.items-end{align-items:flex-end}
.items-center{align-items:center}
.justify-end{justify-content:flex-end}
.justify-center{justify-content:center}
.justify-between{justify-content:space-between}
.gap-1{gap:0.25rem}
.gap-1\.5{gap:0.375rem}
.gap-2{gap:0.5rem}
.gap-3{gap:0.75rem}
.space-y-2 > :not([hidden]) ~ :not([hidden]){--tw-space-y-reverse:0;margin-top:calc(0.5rem * calc(1 - var(--tw-space-y-reverse)));margin-bottom:calc(0.5rem * var(--tw-space-y-reverse))}
.space-y-3 > :not([hidden]) ~ :not([hidden]){--tw-space-y-reverse:0;margin-top:calc(0.75rem * calc(1 - var(--tw-space-y-reverse)));margin-bottom:calc(0.75rem * var(--tw-space-y-reverse))}
.space-y-4 > :not([hidden]) ~ :not([hidden]){--tw-space-y-reverse:0;margin-top:calc(1rem * calc(1 - var(--tw-space-y-reverse)));margin-bottom:calc(1rem * var(--tw-space-y-reverse))}
.space-y-6 > :not([hidden]) ~ :not([hidden]){--tw-space-y-reverse:0;margin-top:calc(1.5rem * calc(1 - var(--tw-space-y-reverse)));margin-bottom:calc(1.5rem * var(--tw-space-y-reverse))}
.overflow-hidden{overflow:hidden}
.overflow-x-auto{overflow-x:auto}
.overflow-y-auto{overflow-y:auto}
.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.whitespace-nowrap{white-space:nowrap}
.rounded{border-radius:0.25rem}
.rounded-2xl{border-radius:1rem}
.rounded-full{border-radius:9999px}
.rounded-lg{border-radius:0.5rem}
.rounded-xl{border-radius:0.75rem}
.border{border-width:1px}
.border-2{border-width:2px}
.border-b{border-bottom-width:1px}
.border-t{border-top-width:1px}
.border-t-2{border-top-width:2px}
.border-black\/10{border-color:rgb(0 0 0 / 0.1)}
.border-gray-100{--tw-border-opacity:1;border-color:rgb(243 244 246 / var(--tw-border-opacity, 1))}
.border-gray-200{--tw-border-opacity:1;border-color:rgb(229 231 235 / var(--tw-border-opacity, 1))}
.border-gray-50{--tw-border-opacity:1;border-color:rgb(249 250 251 / var(--tw-border-opacity, 1))}
.border-red-400{--tw-border-opacity:1;border-color:rgb(248 113 113 / var(--tw-border-opacity, 1))}
.border-transparent{border-color:transparent}
.border-white{--tw-border-opacity:1;border-color:rgb(255 255 255 / var(--tw-border-opacity, 1))}
.bg-black\/50{background-color:rgb(0 0 0 / 0.5)}
.bg-gray-50{--tw-bg-opacity:1;background-color:rgb(249 250 251 / var(--tw-bg-opacity, 1))}
.bg-gray-900{--tw-bg-opacity:1;background-color:rgb(17 24 39 / var(--tw-bg-opacity, 1))}
.bg-red-50{--tw-bg-opacity:1;background-color:rgb(254 242 242 / var(--tw-bg-opacity, 1))}
.bg-transparent{background-color:transparent}
.bg-white{--tw-bg-opacity:1;background-color:rgb(255 255 255 / var(--tw-bg-opacity, 1))}
.p-1{padding:0.25rem}
.p-2{padding:0.5rem}
.p-2\.5{padding:0.625rem}
.p-4{padding:1rem}
.p-5{padding:1.25rem}
.p-6{padding:1.5rem}
.px-1{padding-left:0.25rem;padding-right:0.25rem}
.px-2{padding-left:0.5rem;padding-right:0.5rem}
.px-3{padding-left:0.75rem;padding-right:0.75rem}
.px-4{padding-left:1rem;padding-right:1rem}
.px-5{padding-left:1.25rem;padding-right:1.25rem}
.px-6{padding-left:1.5rem;padding-right:1.5rem}
.py-0\.5{padding-top:0.125rem;padding-bottom:0.125rem}
.py-1{padding-top:0.25rem;padding-bottom:0.25rem}
.py-1\.5{padding-top:0.375rem;padding-bottom:0.375rem}
.py-2{padding-top:0.5rem;padding-bottom:0.5rem}
.py-2\.5{padding-top:0.625rem;padding-bottom:0.625rem}
.py-3{padding-top:0.75rem;padding-bottom:0.75rem}
.py-4{padding-top:1rem;padding-bottom:1rem}
.pb-2{padding-bottom:0.5rem}
.pl-3{padding-left:0.75rem}
.pr-3{padding-right:0.75rem}
.text-left{text-align:left}
.text-center{text-align:center}
.text-right{text-align:right}
.text-2xl{font-size:1.5rem;line-height:2rem}
.text-lg{font-size:1.125rem;line-height:1.75rem}
.text-sm{font-size:0.875rem;line-height:1.25rem}
.text-xl{font-size:1.25rem;line-height:1.75rem}
.text-xs{font-size:0.75rem;line-height:1rem}
.font-bold{font-weight:700}
.font-medium{font-weight:500}
.font-normal{font-weight:400}
.font-semibold{font-weight:600}
.uppercase{text-transform:uppercase}
.tabular-nums{--tw-numeric-spacing:tabular-nums;font-variant-numeric:var(--tw-ordinal) var(--tw-slashed-zero) var(--tw-numeric-figure) var(--tw-numeric-spacing) var(--tw-numeric-fraction)}
.tracking-wide{letter-spacing:0.025em}
.text-gray-300{--tw-text-opacity:1;color:rgb(209 213 219 / var(--tw-text-opacity, 1))}
.text-gray-400{--tw-text-opacity:1;color:rgb(156 163 175 / var(--tw-text-opacity, 1))}
.text-gray-500{--tw-text-opacity:1;color:rgb(107 114 128 / var(--tw-text-opacity, 1))}
.text-gray-600{--tw-text-opacity:1;color:rgb(75 85 99 / var(--tw-text-opacity, 1))}
.text-gray-700{--tw-text-opacity:1;color:rgb(55 65 81 / var(--tw-text-opacity, 1))}
.text-gray-800{--tw-text-opacity:1;color:rgb(31 41 55 / var(--tw-text-opacity, 1))}
.text-gray-900{--tw-text-opacity:1;color:rgb(17 24 39 / var(--tw-text-opacity, 1))}
.text-red-500{--tw-text-opacity:1;color:rgb(239 68 68 / var(--tw-text-opacity, 1))}
.text-teal-500{--tw-text-opacity:1;color:rgb(20 184 166 / var(--tw-text-opacity, 1))}
.text-teal-600{--tw-text-opacity:1;color:rgb(13 148 136 / var(--tw-text-opacity, 1))}
.text-white{--tw-text-opacity:1;color:rgb(255 255 255 / var(--tw-text-opacity, 1))}
.opacity-0{opacity:0}
.shadow{--tw-shadow:0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);--tw-shadow-colored:0 1px 3px 0 var(--tw-shadow-color), 0 1px 2px -1px var(--tw-shadow-color);box-shadow:var(--tw-ring-offset-shadow, 0 0 #0000), var(--tw-ring-shadow, 0 0 #0000), var(--tw-shadow)}
.shadow-2xl{--tw-shadow:0 25px 50px -12px rgb(0 0 0 / 0.25);--tw-shadow-colored:0 25px 50px -12px var(--tw-shadow-color);box-shadow:var(--tw-ring-offset-shadow, 0 0 #0000), var(--tw-ring-shadow, 0 0 #0000), var(--tw-shadow)}
.shadow-sm{--tw-shadow:0 1px 2px 0 rgb(0 0 0 / 0.05);--tw-shadow-colored:0 1px 2px 0 var(--tw-shadow-color);box-shadow:var(--tw-ring-offset-shadow, 0 0 #0000), var(--tw-ring-shadow, 0 0 #0000), var(--tw-shadow)}
.ring{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(3px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000)}
.ring-1{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000)}
.ring-gray-200{--tw-ring-opacity:1;--tw-ring-color:rgb(229 231 235 / var(--tw-ring-opacity, 1))}
.filter{filter:var(--tw-blur) var(--tw-brightness) var(--tw-contrast) var(--tw-grayscale) var(--tw-hue-rotate) var(--tw-invert) var(--tw-saturate) var(--tw-sepia) var(--tw-drop-shadow)}
.transition-all{transition-property:all;transition-timing-function:cubic-bezier(0.4, 0, 0.2, 1);transition-duration:150ms}
.transition-colors{transition-property:color, background-color, border-color, text-decoration-color, fill, stroke;transition-timing-function:cubic-bezier(0.4, 0, 0.2, 1);transition-duration:150ms}
.transition-opacity{transition-property:opacity;transition-timing-function:cubic-bezier(0.4, 0, 0.2, 1);transition-duration:150ms}
.transition-transform{transition-property:transform;transition-timing-function:cubic-bezier(0.4, 0, 0.2, 1);transition-duration:150ms}
.calculator-modern{max-width:1100px;margin:38px auto;padding:0 24px;color:#10243b;font-family:Arial,sans-serif}.calculator-modern *{box-sizing:border-box}.intro .eyebrow{font-size:11px;letter-spacing:.16em;color:#078197;font-weight:700}.intro h1{font-size:34px;line-height:1.2;margin:10px 0}.intro p{color:#607184;font-size:16px}.toolbar{display:flex;justify-content:space-between;gap:20px;align-items:center;margin:26px 0 22px;flex-wrap:wrap}.toolbar nav{display:flex;flex-wrap:wrap;gap:8px}.toolbar a{padding:11px 18px;border:1px solid #dce3eb;border-radius:9px;background:white;color:#294458;text-decoration:none;font-size:14px}.toolbar a[aria-current]{background:#123d4b;color:white;border-color:#123d4b}.unit-switch{display:flex;padding:4px;background:#e9eff4;border-radius:24px}.unit-switch button{padding:7px 15px;border:0;border-radius:20px;font-size:13px;background:transparent;cursor:pointer}.unit-switch button[aria-pressed=true]{background:#10243b;color:white}.workspace{background:#f4f7fa;border:1px solid #e1e8ef;border-radius:18px;padding:26px}.calculator-modern [hidden]{display:none!important}.calculator-modern label{font-weight:500}.calculator-modern input{min-width:0;color:#10243b;background:white}.calculator-modern button{cursor:pointer}.calculator-modern input:focus-visible,.calculator-modern button:focus-visible,.toolbar a:focus-visible{outline:2px solid #008aa2;outline-offset:3px}.estimate-note,.method{font-size:13px;color:#637587;margin:16px 0;line-height:1.6}.method summary{cursor:pointer;color:#087f9c}.preview-banner{background:#fff3d6;text-align:center;padding:7px;font-size:12px;color:#74521a}.calculator-modern section>div.max-w-md{max-width:600px}.calculator-modern section>div.max-w-md>div>div.p-6{padding:24px 32px}.calculator-modern table input{max-width:100%}@media(max-width:600px){.calculator-modern{padding:0 12px;margin:24px auto}.intro h1{font-size:28px}.toolbar{gap:14px}.toolbar a{padding:10px 13px}.workspace{padding:12px 0}.calculator-modern section>div.max-w-md>div>div.p-6{padding:20px 14px}.calculator-modern .w-40{width:8rem}.calculator-modern .gap-3{gap:8px}.calculator-modern .p-6{padding:16px}.calculator-modern .w-24{width:5.5rem}.calculator-modern .px-5{padding-left:10px;padding-right:10px}}@media print{#site-navigation,.preview-banner,.toolbar,.intro,.estimate-note,.method{display:none!important}.calculator-modern{margin:0;padding:0}.workspace{border:0;padding:0;background:white}.calculator-modern section[hidden]{display:none!important}}

.calculator-modern h2{font-size:24px;line-height:1.3;margin:0}.calculator-modern h3{font-size:16px;line-height:1.4;margin:0}
.calculator-modern table input[type=number]{min-width:76px}
.helium-card{max-width:650px;margin:auto;background:white;padding:28px;border:1px solid #e1e8ef;border-radius:16px}.helium-card>p{color:#607184}.helium-card label,.helium-results>div{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:18px 0}.helium-card input{width:100px;border:1px solid #dce3eb;border-radius:7px;padding:8px}.helium-results{background:#eef7f8;padding:10px 18px;border-radius:10px}.helium-results dd{margin:0;font-variant-numeric:tabular-nums}.helium-results strong{font-size:22px;color:#087f87}
.helium-card select{max-width:60%;padding:9px;border:1px solid #dce3eb;border-radius:7px;background:white}.helium-tanks{display:grid;grid-template-columns:1fr 1fr;gap:12px}.helium-tank{border:1px solid #dce3eb;border-radius:10px;padding:14px}.helium-tank strong{display:block;margin-top:10px;font-size:14px}.helium-tank p{font-size:13px;margin-bottom:0}@media(max-width:480px){.helium-tanks{grid-template-columns:1fr}.helium-card{padding:18px}}.last\:border-0:last-child{border-width:0px}.hover\:scale-110:hover{--tw-scale-x:1.1;--tw-scale-y:1.1;transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.hover\:border-gray-200:hover{--tw-border-opacity:1;border-color:rgb(229 231 235 / var(--tw-border-opacity, 1))}.hover\:bg-gray-100:hover{--tw-bg-opacity:1;background-color:rgb(243 244 246 / var(--tw-bg-opacity, 1))}.hover\:bg-gray-800:hover{--tw-bg-opacity:1;background-color:rgb(31 41 55 / var(--tw-bg-opacity, 1))}.hover\:text-red-500:hover{--tw-text-opacity:1;color:rgb(239 68 68 / var(--tw-text-opacity, 1))}.hover\:text-teal-700:hover{--tw-text-opacity:1;color:rgb(15 118 110 / var(--tw-text-opacity, 1))}.hover\:ring-gray-400:hover{--tw-ring-opacity:1;--tw-ring-color:rgb(156 163 175 / var(--tw-ring-opacity, 1))}.focus\:border-teal-400:focus{--tw-border-opacity:1;border-color:rgb(45 212 191 / var(--tw-border-opacity, 1))}.focus\:outline-none:focus{outline:2px solid transparent;outline-offset:2px}.focus\:ring-2:focus{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000)}.focus\:ring-gray-900:focus{--tw-ring-opacity:1;--tw-ring-color:rgb(17 24 39 / var(--tw-ring-opacity, 1))}.focus\:ring-red-400:focus{--tw-ring-opacity:1;--tw-ring-color:rgb(248 113 113 / var(--tw-ring-opacity, 1))}.group:hover .group-hover\:opacity-100{opacity:1}@media (min-width: 640px){
.sm\:p-6{padding:1.5rem}}@media print{
.print\:block{display:block}
.print\:hidden{display:none}
.print\:rounded{border-radius:0.25rem}
.print\:border{border-width:1px}
.print\:border-0{border-width:0px}
.print\:border-gray-200{--tw-border-opacity:1;border-color:rgb(229 231 235 / var(--tw-border-opacity, 1))}
.print\:bg-transparent{background-color:transparent}
.print\:font-semibold{font-weight:600}
.print\:shadow-none{--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;box-shadow:var(--tw-ring-offset-shadow, 0 0 #0000), var(--tw-ring-shadow, 0 0 #0000), var(--tw-shadow)}}