.calculator-page {
    background: #f7f7f7;
}

.calculator-hero {
    padding: 120px 0 70px;
    background: linear-gradient(135deg, #161616 0%, #3a1717 100%);
    color: #fff;
}

.calculator-hero h1 {
    max-width: 850px;
    margin: 14px auto 16px;
    text-align: center;
    font-size: clamp(34px, 5vw, 64px);
}

.calculator-hero p {
    max-width: 780px;
    margin: 0 auto;
    text-align: center;
    color: rgba(255, 255, 255, .8);
}

.calculator-wrap {
    padding: 70px 0 90px;
}

.calculator-card,
.calculator-result,
.calculator-note {
    border: 1px solid #e2e6ea;
    border-radius: 16px;
    background: #fff;
    box-shadow: 0 12px 35px rgba(19, 31, 45, .06);
}

.calculator-card {
    padding: 30px;
}

.calculator-card h2,
.calculator-result h2 {
    margin: 0 0 22px;
    color: #141414;
    font-size: 27px;
}

.calculator-field {
    margin-bottom: 18px;
}

.calculator-field label {
    display: block;
    margin-bottom: 7px;
    color: #242424;
    font-weight: 600;
}

.calculator-field input,
.calculator-field select {
    width: 100%;
    min-height: 48px;
    padding: 10px 13px;
    border: 1px solid #d8dee5;
    border-radius: 8px;
    color: #252525;
    background: #fff;
}

.calculator-field small {
    display: block;
    margin-top: 6px;
    color: #657383;
    line-height: 1.5;
}

.calculator-submit {
    width: 100%;
    margin-top: 8px;
    border: 0;
    border-radius: 8px;
    padding: 14px 18px;
    color: #fff;
    background: #b40000;
    font-weight: 700;
    cursor: pointer;
}

.calculator-submit:hover {
    background: #d00000;
}

.calculator-result {
    padding: 30px;
}

.calculator-result-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.calculator-metric {
    min-height: 116px;
    padding: 18px;
    border-radius: 12px;
    background: #f5f6f7;
}

.calculator-metric span {
    display: block;
    margin-bottom: 8px;
    color: #67727e;
    font-size: 14px;
}

.calculator-metric strong {
    display: block;
    color: #b40000;
    font-size: 30px;
}

.calculator-result-text {
    margin: 22px 0 0;
    color: #536171;
    line-height: 1.75;
}

.calculator-note {
    margin-top: 20px;
    padding: 20px 22px;
    border-left: 4px solid #b40000;
    color: #536171;
    line-height: 1.7;
}

.calculator-note strong {
    color: #222;
}

/* Premium gas calculator workspace */
.gas-calculator-shell{display:grid;grid-template-columns:minmax(340px,.78fr) minmax(0,1.22fr);gap:22px;align-items:stretch}.gas-input-panel,.gas-visual-panel{border:1px solid #e1e5ea;border-radius:24px;background:#fff;box-shadow:0 18px 45px rgba(19,31,45,.07)}.gas-input-panel{padding:28px}.gas-panel-heading h2,.gas-view-toolbar h2{margin:10px 0 7px;color:#151515;font-size:28px}.gas-panel-heading p{margin:0 0 25px;color:#667381;line-height:1.6}.gas-input-panel .calculator-card{padding:0;border:0;box-shadow:none}.gas-input-section{padding:19px 0;border-top:1px solid #edf0f3}.gas-input-section:first-child{padding-top:0;border-top:0}.gas-input-section-title{display:flex;gap:12px;align-items:center;margin-bottom:16px}.gas-input-section-title>span{display:grid;place-items:center;width:30px;height:30px;border-radius:10px;background:#1a1d21;color:#fff;font-size:11px;font-weight:800}.gas-input-section-title strong,.gas-input-section-title small{display:block}.gas-input-section-title strong{color:#1a1d21}.gas-input-section-title small{margin-top:3px;color:#8994a0;font-size:12px}.gas-input-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.gas-input-grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}.gas-input-panel .calculator-field{margin-bottom:0}.gas-input-panel .calculator-field label{font-size:12px;color:#586572}.gas-input-panel .calculator-field label em{float:right;color:#a0a9b2;font-style:normal;font-weight:500}.gas-input-panel .calculator-field input,.gas-input-panel .calculator-field select{min-height:48px;border-radius:11px;background:#fafbfc}.gas-input-panel .calculator-field small{font-size:11px}.gas-input-panel .calculator-submit{display:flex;gap:9px;align-items:center;justify-content:center;margin-top:20px;border-radius:12px;background:#bd0713}.gas-visual-panel{padding:28px;background:#171a1e;color:#fff}.gas-view-toolbar{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:18px}.gas-view-toolbar h2{color:#fff}.gas-view-toolbar .calculator-eyebrow{color:#ff6972}.gas-view-toolbar .calculator-eyebrow::before{background:#ff6972}.gas-view-tabs{display:flex;border:1px solid #424950;border-radius:10px;overflow:hidden}.gas-view-tab{border:0;padding:11px 15px;color:#aab3bb;background:transparent;font-weight:700;cursor:pointer}.gas-view-tab.is-active{color:#fff;background:#bd0713}.gas-visual-stage{position:relative;min-height:395px;border:1px solid #343a40;border-radius:18px;background:#20252a;overflow:hidden}.gas-view-canvas{display:none;width:100%;height:395px}.gas-view-canvas.is-active{display:block}.gas-grid-bg{fill:#20252a}.gas-room-fill{fill:#ffdf00;fill-opacity:.16;stroke:#ff6972;stroke-width:2}.gas-room-line{fill:none;stroke:#f7f8fa;stroke-width:2}.gas-dimension{stroke:#8d9aa7;stroke-width:1.4;stroke-dasharray:5 5}.gas-dimension-label,.gas-canvas-caption{fill:#dbe1e6;font-family:inherit;font-size:14px}.gas-canvas-caption{fill:#8f9ba6;font-size:11px;letter-spacing:2px}.gas-nozzles circle,.gas-iso-nozzle{fill:#ff6972;stroke:#fff;stroke-width:2}.gas-iso-ceiling{fill:#ffdf00;fill-opacity:.26;stroke:#f7f8fa;stroke-width:2}.gas-iso-left,.gas-iso-right{fill:#bd0713;fill-opacity:.26;stroke:#f7f8fa;stroke-width:2}.gas-iso-nozzle-line{fill:none;stroke:#ff6972;stroke-width:2;stroke-dasharray:5 4}.gas-live-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:17px;border:1px solid #343a40;border-radius:13px;overflow:hidden;background:#343a40}.gas-live-metrics>div{padding:14px 12px;background:#20252a}.gas-live-metrics span{display:block;color:#8f9ba6;font-size:11px}.gas-live-metrics strong{display:block;margin-top:4px;color:#ffdf00;font-size:22px}.gas-result-footer{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:17px}.gas-result-footer p{margin:0;color:#b9c2ca;font-size:13px;line-height:1.5}.gas-print-button{flex:0 0 auto;border:1px solid #56616c;border-radius:10px;padding:11px 15px;color:#fff;background:transparent;font-weight:700;cursor:pointer}.gas-print-button:hover{border-color:#ff6972;background:#bd0713}.gas-main-note{margin-top:22px;background:#fff}
@media(max-width:991px){.gas-calculator-shell{grid-template-columns:1fr}.gas-input-panel{order:1}.gas-visual-panel{order:2}}@media(max-width:575px){.gas-input-grid{grid-template-columns:1fr}.gas-view-toolbar,.gas-result-footer{display:block}.gas-view-tabs{margin-top:16px;width:max-content}.gas-live-metrics{grid-template-columns:repeat(2,1fr)}.gas-print-button{margin-top:12px}.gas-visual-stage,.gas-view-canvas{min-height:300px;height:300px}}
@media print{body.calculator-page header,body.calculator-page footer,.page-header,.gas-input-panel,.gas-view-tabs,.gas-print-button,.calculator-steps,.gas-engineering-section{display:none!important}.calculator-wrap{padding:20px 0}.gas-calculator-shell{display:block}.gas-visual-panel{color:#111;background:#fff;box-shadow:none;border:0}.gas-visual-stage{border:1px solid #ddd;background:#fff}.gas-grid-bg{fill:#fff}.gas-live-metrics>div{background:#fff}.gas-live-metrics{background:#ddd}.gas-live-metrics span{color:#555}.gas-result-footer p{color:#333}.gas-view-canvas{height:360px}.gas-view-canvas[data-gas-canvas="plan"]{display:block}}
.gas-room-fill,.gas-room-line,.gas-iso-room,.gas-dimension-label{transition:all .45s cubic-bezier(.22,.61,.36,1)}
.door-fan-topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:42px}.door-fan-topic-grid article{padding:25px;border:1px solid #e2e6ea;border-radius:16px;background:#fff}.door-fan-topic-grid article>span{display:grid;width:34px;height:34px;place-items:center;margin-bottom:17px;border-radius:10px;color:#fff;background:#171a1e;font-size:11px;font-weight:800}.door-fan-topic-grid h3{margin:0 0 10px;color:#171717;font-size:20px}.door-fan-topic-grid p{margin:0;color:#657383;line-height:1.7;font-size:14px}@media(max-width:767px){.door-fan-topic-grid{grid-template-columns:1fr}}

.calculation-directory-hero{padding:86px 0 96px;background:#fff}.calculation-directory-intro{max-width:760px;margin:0 auto 46px;text-align:center}.calculation-directory-intro h2{margin:16px 0 15px;color:#171717;font-size:clamp(32px,4.5vw,56px);line-height:1.08}.calculation-directory-intro p{margin:0;color:#657383;font-size:17px;line-height:1.75}.calculation-directory-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.calculation-directory-card{position:relative;display:flex;min-height:390px;flex-direction:column;padding:30px;border:1px solid #e4e8ec;border-radius:22px;background:linear-gradient(150deg,#fff 0%,#f8f9fa 100%);box-shadow:0 18px 42px rgba(19,31,45,.07);overflow:hidden;transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}.calculation-directory-card::after{position:absolute;right:-45px;bottom:-55px;width:180px;height:180px;border:28px solid rgba(189,7,19,.06);border-radius:50%;content:""}.calculation-directory-card:hover{border-color:#bd0713;box-shadow:0 25px 55px rgba(19,31,45,.13);transform:translateY(-7px)}.calculation-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:36px}.calculation-card-number{display:grid;width:42px;height:42px;place-items:center;border-radius:12px;color:#fff;background:#171a1e;font-size:12px;font-weight:800}.calculation-card-top i{display:grid;width:52px;height:52px;place-items:center;border-radius:16px;color:#bd0713;background:#fff0f1;font-size:23px}.calculation-card-eyebrow{color:#bd0713;font-size:11px;font-weight:800;letter-spacing:.15em}.calculation-directory-card h3{margin:13px 0 12px;max-width:270px;color:#171717;font-size:25px;line-height:1.18}.calculation-directory-card h3 a{color:inherit}.calculation-directory-card p{margin:0;color:#657383;line-height:1.7}.calculation-card-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:22px}.calculation-card-tags span{padding:6px 9px;border:1px solid #e0e5e9;border-radius:7px;color:#6c7782;background:#fff;font-size:11px;font-weight:700}.calculation-card-link{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:25px;color:#bd0713;font-weight:800}.calculation-card-link i{transition:transform .2s ease}.calculation-directory-card:hover .calculation-card-link i{transform:translateX(5px)}.calculation-seo-section{padding:100px 0;background:#f6f7f8}.calculation-article-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(300px,.7fr);gap:44px;align-items:start}.calculation-seo-article{padding:8px 0}.calculation-seo-article h2{margin:14px 0 20px;color:#171717;font-size:clamp(30px,4vw,46px);line-height:1.12}.calculation-seo-article h3{margin:34px 0 10px;color:#171717;font-size:24px}.calculation-seo-article p{margin:0 0 18px;color:#596776;line-height:1.85}.calculation-seo-aside{position:sticky;top:25px;padding:30px;border-radius:20px;color:#fff;background:#171a1e;box-shadow:0 18px 45px rgba(19,31,45,.12)}.calculation-aside-head h3{margin:13px 0 20px;color:#fff;font-size:25px}.calculation-seo-aside .calculator-eyebrow{color:#ff6972}.calculation-seo-aside .calculator-eyebrow::before{background:#ff6972}.calculation-seo-aside ul{margin:0;padding:0;list-style:none}.calculation-seo-aside li{display:flex;gap:11px;padding:13px 0;border-top:1px solid #30363c;color:#d4dbe0;line-height:1.5}.calculation-seo-aside li i{margin-top:4px;color:#ff6972}.calculation-aside-button{display:flex;align-items:center;justify-content:space-between;margin-top:22px;padding:13px 15px;border-radius:10px;color:#fff;background:#bd0713;font-weight:800}.calculation-faq-section{padding:100px 0;background:#fff}.calculation-section-heading{margin-bottom:35px;text-align:center}.calculation-section-heading h2{margin:14px 0 0;color:#171717;font-size:clamp(30px,4vw,46px)}.calculation-faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.calculation-faq-grid details{border:1px solid #e3e7eb;border-radius:14px;background:#fff}.calculation-faq-grid summary{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:20px 22px;color:#171717;font-weight:800;cursor:pointer;list-style:none}.calculation-faq-grid summary::-webkit-details-marker{display:none}.calculation-faq-grid summary i{color:#bd0713;transition:transform .2s ease}.calculation-faq-grid details[open] summary i{transform:rotate(45deg)}.calculation-faq-grid details p{margin:0;padding:0 22px 21px;color:#657383;line-height:1.75}.calculation-directory-cta{padding:65px 0;color:#fff;background:linear-gradient(120deg,#171a1e,#3b1418)}.calculation-directory-cta .container{display:flex;align-items:center;justify-content:space-between;gap:30px}.calculation-directory-cta h2{margin:13px 0 9px;color:#fff;font-size:clamp(28px,3.5vw,42px)}.calculation-directory-cta p{max-width:670px;margin:0;color:#c3cbd1;line-height:1.7}.calculation-directory-cta .calculator-eyebrow{color:#ff6972}.calculation-directory-cta .calculator-eyebrow::before{background:#ff6972}.calculation-directory-cta a{display:flex;flex:0 0 auto;align-items:center;gap:14px;padding:16px 20px;border-radius:10px;color:#fff;background:#bd0713;font-weight:800}.calculation-directory-cta a i{transition:transform .2s ease}.calculation-directory-cta a:hover i{transform:translateX(4px)}
@media(max-width:991px){.calculation-directory-grid{grid-template-columns:1fr}.calculation-directory-card{min-height:310px}.calculation-article-grid{grid-template-columns:1fr}.calculation-seo-aside{position:static}.calculation-directory-cta .container{display:block}.calculation-directory-cta a{width:max-content;margin-top:24px}}@media(max-width:575px){.calculation-directory-hero,.calculation-seo-section,.calculation-faq-section{padding:65px 0}.calculation-directory-card{padding:24px}.calculation-faq-grid{grid-template-columns:1fr}.calculation-directory-cta a{width:100%;justify-content:center}}

.calculator-steps {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 22px;
    padding-left: 0;
}

.calculator-step-card {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    min-height: 144px;
    padding: 20px;
    border: 1px solid #e5e8ec;
    border-radius: 14px;
    background: #fff;
    box-shadow: 0 10px 24px rgba(20, 30, 40, .05);
}

.calculator-step-card > span {
    display: inline-flex;
    width: 38px;
    height: 38px;
    flex: 0 0 38px;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    color: #fff;
    background: #b40000;
    font-size: 13px;
    font-weight: 800;
}

.calculator-step-card h3 {
    margin: 2px 0 8px;
    color: #171717;
    font-size: 17px;
    line-height: 1.3;
}

.calculator-step-card p {
    margin: 0;
    color: #596776;
    font-size: 14px;
    line-height: 1.6;
}

.gas-engineering-section {
    padding: 92px 0 110px;
    background: #fff;
}

.calculator-section-heading {
    max-width: 760px;
    margin: 0 auto 42px;
    text-align: center;
}

.calculator-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    color: #b40000;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .16em;
    text-transform: uppercase;
}

.calculator-eyebrow::before {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #b40000;
    content: '';
}

.calculator-section-heading h2 {
    margin: 15px 0 14px;
    color: #151515;
    font-size: clamp(30px, 4vw, 48px);
    line-height: 1.12;
}

.calculator-section-heading p,
.gas-info-card p,
.gas-formula-card p,
.gas-table-note,
.gas-disclaimer p,
.gas-cta-card p {
    color: #596776;
    line-height: 1.75;
}

.gas-info-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.gas-info-card {
    position: relative;
    min-height: 245px;
    padding: 28px 24px 24px;
    overflow: hidden;
    border: 1px solid #e5e8ec;
    border-radius: 18px;
    background: linear-gradient(145deg, #fff 0%, #f7f8fa 100%);
    box-shadow: 0 14px 35px rgba(20, 30, 40, .06);
}

.gas-info-card::after {
    position: absolute;
    right: -30px;
    bottom: -45px;
    width: 125px;
    height: 125px;
    border: 18px solid rgba(180, 0, 0, .06);
    border-radius: 50%;
    content: '';
}

.gas-card-number {
    display: inline-flex;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    border-radius: 12px;
    color: #fff;
    background: #b40000;
    font-weight: 800;
}

.gas-info-card h3,
.gas-formula-card h3,
.gas-table-card h3,
.gas-considerations h3,
.gas-disclaimer h3 {
    margin: 0 0 12px;
    color: #181818;
    font-size: 21px;
}

.gas-info-card p {
    position: relative;
    z-index: 1;
    margin: 0;
    font-size: 15px;
}

.gas-detail-grid {
    display: grid;
    grid-template-columns: .9fr 1.1fr;
    gap: 22px;
    margin-top: 22px;
}

.gas-formula-card,
.gas-table-card,
.gas-considerations,
.gas-disclaimer,
.gas-cta-card {
    border: 1px solid #e5e8ec;
    border-radius: 18px;
    box-shadow: 0 14px 35px rgba(20, 30, 40, .06);
}

.gas-formula-card {
    padding: 32px;
    color: #fff;
    background: linear-gradient(145deg, #171717 0%, #341717 100%);
}

.gas-formula-card .calculator-eyebrow { color: #ffb0b0; }
.gas-formula-card .calculator-eyebrow::before { background: #ffb0b0; }
.gas-formula-card h3 { color: #fff; margin-top: 14px; }
.gas-formula-card p { color: rgba(255, 255, 255, .74); margin: 22px 0 0; }

.gas-formula {
    margin: 26px 0;
    padding: 22px 18px;
    border: 1px solid rgba(255, 255, 255, .18);
    border-radius: 12px;
    color: #fff;
    background: rgba(255, 255, 255, .08);
    font-size: clamp(22px, 3vw, 32px);
    font-weight: 700;
    text-align: center;
}

.gas-formula-list { margin: 0; }
.gas-formula-list div { display: flex; gap: 14px; padding: 10px 0; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.gas-formula-list dt { width: 24px; flex: 0 0 24px; color: #ffb0b0; font-weight: 800; }
.gas-formula-list dd { margin: 0; color: rgba(255, 255, 255, .78); }

.gas-table-card { padding: 32px; background: #fff; }
.gas-table-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.gas-table-heading h3 { margin-top: 14px; }
.gas-table-badge { padding: 8px 12px; border-radius: 999px; color: #b40000; background: #fff0f0; font-size: 13px; font-weight: 700; white-space: nowrap; }
.gas-table-wrap { overflow-x: auto; }
.gas-table { width: 100%; min-width: 420px; border-collapse: collapse; }
.gas-table th, .gas-table td { padding: 14px 12px; border-bottom: 1px solid #edf0f2; text-align: left; }
.gas-table th { color: #687482; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.gas-table td { color: #26313c; font-weight: 600; }
.gas-table tbody tr:last-child td { border-bottom: 0; }
.gas-table-note { margin: 18px 0 0; font-size: 13px; }

.gas-considerations { display: grid; grid-template-columns: .75fr 1.25fr; gap: 34px; margin-top: 22px; padding: 32px; background: #f7f8f9; }
.gas-considerations-heading h3 { margin-top: 14px; font-size: 26px; }
.gas-consideration-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.gas-consideration-list div { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 10px; background: #fff; }
.gas-consideration-list strong { color: #b40000; font-size: 13px; }
.gas-consideration-list span { color: #42515f; font-size: 14px; font-weight: 600; }

.gas-disclaimer { display: flex; gap: 18px; align-items: flex-start; margin-top: 22px; padding: 25px 28px; border-left: 4px solid #b40000; background: #fff8f8; }
.gas-disclaimer-icon { display: inline-flex; width: 44px; height: 44px; flex: 0 0 44px; align-items: center; justify-content: center; border-radius: 12px; color: #b40000; background: #ffe3e3; }
.gas-disclaimer h3 { margin-bottom: 6px; font-size: 18px; }
.gas-disclaimer p { margin: 0; font-size: 14px; }

.gas-cta-card { display: flex; align-items: center; justify-content: space-between; gap: 28px; margin-top: 22px; padding: 32px; color: #fff; background: linear-gradient(110deg, #b40000 0%, #5f0000 100%); }
.gas-cta-card .calculator-eyebrow { color: #ffd3d3; }
.gas-cta-card .calculator-eyebrow::before { background: #ffd3d3; }
.gas-cta-card h2 { margin: 13px 0 8px; color: #fff; font-size: clamp(25px, 3vw, 36px); }
.gas-cta-card p { max-width: 650px; margin: 0; color: rgba(255,255,255,.8); }
.gas-cta-button { display: inline-flex; align-items: center; gap: 12px; flex: 0 0 auto; padding: 14px 20px; border-radius: 8px; color: #171717; background: #fff; font-weight: 800; text-decoration: none; }
.gas-cta-button:hover { color: #b40000; }

@media (max-width: 991px) {
    .gas-info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .gas-detail-grid,
    .gas-considerations { grid-template-columns: 1fr; }
}

@media (max-width: 767px) {
    .calculator-hero {
        padding: 85px 0 45px;
    }

    .calculator-wrap {
        padding: 42px 0 60px;
    }

    .calculator-card,
    .calculator-result {
        padding: 22px;
    }

    .calculator-result-grid {
        grid-template-columns: 1fr;
    }

    .calculator-steps { grid-template-columns: 1fr; }

    .gas-engineering-section { padding: 58px 0 72px; }
    .page-header .page-header-box { padding: 46px 18px; }
    .page-header .page-header-box h1 { font-size: clamp(30px, 9vw, 42px); line-height: 1.15; }
    .gas-info-grid { grid-template-columns: 1fr; }
    .calculator-section-heading { margin-bottom: 30px; }
    .calculator-section-heading h2 { font-size: 30px; }
    .calculator-card h2,
    .calculator-result h2 { font-size: 23px; }
    .calculator-field input,
    .calculator-field select { min-height: 46px; }
    .gas-formula-card,
    .gas-table-card,
    .gas-considerations,
    .gas-disclaimer,
    .gas-cta-card { padding: 22px; }
    .gas-formula { padding: 18px 10px; font-size: 20px; }
    .gas-table { min-width: 360px; }
    .gas-table th,
    .gas-table td { padding: 11px 8px; font-size: 13px; }
    .gas-disclaimer { gap: 12px; }
    .gas-disclaimer-icon { width: 38px; height: 38px; flex-basis: 38px; }
    .gas-consideration-list { grid-template-columns: 1fr; }
    .gas-table-heading,
    .gas-cta-card { align-items: flex-start; flex-direction: column; }
    .gas-cta-button { width: 100%; justify-content: center; }
}