.gas-calculator-wrapper{--gas-primary: #16a34a;--gas-primary-dark: #15803d;--gas-primary-light: #22c55e;--gas-secondary: #0ea5e9;--gas-accent: #f59e0b;--gas-bg: #f0fdf4;--gas-card-bg: #ffffff;--gas-text: #1f2937;--gas-text-muted: #6b7280;--gas-border: #bbf7d0;--gas-shadow: 0 4px 6px -1px rgba(22, 163, 74, .1), 0 2px 4px -2px rgba(22, 163, 74, .1);--gas-shadow-lg: 0 10px 15px -3px rgba(22, 163, 74, .15), 0 4px 6px -4px rgba(22, 163, 74, .1);--gas-radius: 12px;--gas-radius-lg: 16px}.gas-calculator-container{max-width:800px;margin:0 auto;padding:2rem;background:var(--gas-bg);border-radius:var(--gas-radius-lg)}.gas-header{text-align:center;margin-bottom:2rem}.gas-title{font-size:2rem;font-weight:800;color:var(--gas-text);margin:0 0 .5rem;background:linear-gradient(135deg,var(--gas-primary),var(--gas-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.gas-description{color:var(--gas-text-muted);font-size:1.05rem;margin:0;line-height:1.6}.gas-formula-section{background:var(--gas-card-bg);border-radius:var(--gas-radius-lg);padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--gas-shadow)}.gas-formula-title{font-size:1.1rem;font-weight:700;color:var(--gas-text);margin:0 0 1rem;text-align:center}.gas-formula-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}@media (max-width: 640px){.gas-formula-grid{grid-template-columns:1fr}}.gas-formula-card{background:linear-gradient(135deg,#f0fdf4,#dcfce7);border-radius:var(--gas-radius);padding:1rem;text-align:center;border:1px solid var(--gas-border)}.gas-formula-label{font-size:.85rem;font-weight:600;color:var(--gas-primary-dark);margin:0 0 .5rem}.gas-formula-math{font-size:.95rem;color:var(--gas-text);overflow-x:auto;padding:.25rem 0}.gas-unit-toggle{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem;margin-bottom:1rem;background:var(--gas-card-bg);padding:.5rem;border-radius:var(--gas-radius);box-shadow:var(--gas-shadow)}.gas-unit-btn{display:flex;flex-direction:column;align-items:center;padding:.75rem;border:2px solid transparent;border-radius:calc(var(--gas-radius) - 2px);background:#f9fafb;cursor:pointer;transition:all .2s ease}.gas-unit-btn:hover{background:#f0fdf4;border-color:var(--gas-primary-light)}.gas-unit-btn.active{background:linear-gradient(135deg,var(--gas-primary),var(--gas-primary-dark));border-color:var(--gas-primary);color:#fff}.gas-unit-label{font-weight:700;font-size:.95rem}.gas-unit-detail{font-size:.75rem;opacity:.8;margin-top:.125rem}.gas-mode-tabs{display:flex;gap:.25rem;margin-bottom:1.5rem;background:var(--gas-card-bg);padding:.375rem;border-radius:var(--gas-radius);box-shadow:var(--gas-shadow)}.gas-mode-tab{flex:1;padding:.625rem 1rem;border:none;border-radius:calc(var(--gas-radius) - 4px);background:transparent;cursor:pointer;font-weight:600;font-size:.875rem;color:var(--gas-text-muted);transition:all .2s ease}.gas-mode-tab:hover{background:#f0fdf4;color:var(--gas-primary)}.gas-mode-tab.active{background:var(--gas-primary);color:#fff}.gas-form{background:var(--gas-card-bg);border-radius:var(--gas-radius-lg);padding:1.5rem;box-shadow:var(--gas-shadow);margin-bottom:1.5rem}.gas-form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}@media (max-width: 480px){.gas-form-row{grid-template-columns:1fr}}.gas-input-group{display:flex;flex-direction:column;gap:.375rem;position:relative;margin-bottom:1rem}.gas-label{font-size:.875rem;font-weight:600;color:var(--gas-text)}.gas-input{padding:.75rem 4rem .75rem 1rem;border:2px solid var(--gas-border);border-radius:var(--gas-radius);font-size:1rem;color:var(--gas-text);background:#f0fdf4;transition:all .2s ease;width:100%;box-sizing:border-box}.gas-input:focus{outline:none;border-color:var(--gas-primary);box-shadow:0 0 0 3px #16a34a26;background:#fff}.gas-input::-moz-placeholder{color:var(--gas-text-muted);opacity:.6}.gas-input::placeholder{color:var(--gas-text-muted);opacity:.6}.gas-input-suffix{position:absolute;right:1rem;top:2.25rem;font-size:.85rem;color:var(--gas-text-muted);pointer-events:none}.gas-button-row{display:flex;gap:1rem;margin-top:.5rem}.gas-btn{flex:1;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.875rem 1.5rem;border:none;border-radius:var(--gas-radius);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease}.gas-btn-primary{background:linear-gradient(135deg,var(--gas-primary),var(--gas-primary-dark));color:#fff;box-shadow:var(--gas-shadow)}.gas-btn-primary:hover{transform:translateY(-2px);box-shadow:var(--gas-shadow-lg)}.gas-btn-secondary{background:#f3f4f6;color:var(--gas-text);border:2px solid var(--gas-border)}.gas-btn-secondary:hover{background:#e5e7eb}.gas-btn-icon{width:20px;height:20px}.gas-results{background:var(--gas-card-bg);border-radius:var(--gas-radius-lg);padding:1.5rem;box-shadow:var(--gas-shadow-lg);margin-bottom:1.5rem;border:2px solid var(--gas-primary-light)}.gas-results-title{font-size:1.25rem;font-weight:700;color:var(--gas-text);margin:0 0 1rem;text-align:center}.gas-results-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:1rem}@media (max-width: 640px){.gas-results-grid{grid-template-columns:1fr}}.gas-result-card{background:linear-gradient(135deg,#f0fdf4,#dcfce7);border-radius:var(--gas-radius);padding:1rem;text-align:center;display:flex;flex-direction:column;gap:.25rem}.gas-result-card.gas-result-primary{background:linear-gradient(135deg,var(--gas-primary),var(--gas-primary-dark));color:#fff}.gas-result-card.compare-full{grid-column:span 3}@media (max-width: 640px){.gas-result-card.compare-full{grid-column:span 1}}.gas-result-label{font-size:.8rem;font-weight:500;text-transform:uppercase;letter-spacing:.05em;opacity:.8}.gas-result-value{font-size:1.75rem;font-weight:800;color:var(--gas-primary-dark)}.gas-result-card.gas-result-primary .gas-result-value{font-size:2.5rem;color:#fff}.gas-result-unit{font-size:.85rem;opacity:.9}.gas-result-rating{font-size:1.1rem;text-transform:capitalize}.gas-efficiency-bar{margin-top:1rem}.gas-efficiency-scale{display:flex;justify-content:space-between;font-size:.75rem;color:var(--gas-text-muted);margin-bottom:.5rem}.gas-efficiency-track{height:12px;background:linear-gradient(90deg,#ef4444,#f59e0b,#84cc16 66%,#22c55e);border-radius:6px;position:relative}.gas-efficiency-marker{position:absolute;width:4px;height:20px;background:#fff;border:2px solid var(--gas-text);border-radius:2px;top:-4px;transform:translate(-50%);transition:left .5s ease;box-shadow:0 2px 4px #0003}.gas-content{margin-top:2rem}.gas-section{background:var(--gas-card-bg);border-radius:var(--gas-radius-lg);padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--gas-shadow)}.gas-section-title{font-size:1.35rem;font-weight:700;color:var(--gas-text);margin:0 0 1rem;padding-bottom:.75rem;border-bottom:2px solid var(--gas-border)}.gas-section-text{color:var(--gas-text);line-height:1.7;margin:0 0 1rem}.gas-features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-top:1.5rem}@media (max-width: 640px){.gas-features-grid{grid-template-columns:1fr}}.gas-feature-card{background:linear-gradient(135deg,#f0fdf4,#dcfce7);border-radius:var(--gas-radius);padding:1.25rem;text-align:center;border:1px solid var(--gas-border)}.gas-feature-icon{font-size:2rem;display:block;margin-bottom:.75rem}.gas-feature-title{font-size:1rem;font-weight:700;color:var(--gas-text);margin:0 0 .5rem}.gas-feature-desc{font-size:.9rem;color:var(--gas-text-muted);margin:0;line-height:1.5}.gas-tips-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-top:1rem}@media (max-width: 768px){.gas-tips-grid{grid-template-columns:1fr}}.gas-tip-card{background:#f0fdf4;border-radius:var(--gas-radius);padding:1rem;border-left:4px solid var(--gas-primary)}.gas-tip-header{display:flex;align-items:center;gap:.5rem;margin-bottom:.5rem}.gas-tip-icon{font-size:1.25rem}.gas-tip-title{font-size:.95rem;font-weight:700;color:var(--gas-text);margin:0}.gas-tip-text{font-size:.9rem;color:var(--gas-text-muted);margin:0;line-height:1.6}.gas-table-wrapper{overflow-x:auto;margin-top:1rem;border-radius:var(--gas-radius);border:1px solid var(--gas-border)}.gas-table{width:100%;border-collapse:collapse;font-size:.9rem}.gas-table th{background:linear-gradient(135deg,var(--gas-primary),var(--gas-primary-dark));color:#fff;padding:.875rem 1rem;text-align:left;font-weight:600}.gas-table td{padding:.75rem 1rem;border-bottom:1px solid var(--gas-border);color:var(--gas-text)}.gas-table tr:last-child td{border-bottom:none}.gas-table tr:nth-child(2n){background:#f0fdf4}.gas-table-note{font-size:.8rem;color:var(--gas-text-muted);font-style:italic;margin:.75rem 0 0;padding:0 1rem}.gas-faqs{margin-top:1rem}.gas-faq{background:#f0fdf4;border-radius:var(--gas-radius);margin-bottom:.75rem;border:1px solid var(--gas-border);overflow:hidden}.gas-faq[open]{background:#fff}.gas-faq-question{padding:1rem 1.25rem;font-weight:600;color:var(--gas-text);cursor:pointer;display:flex;justify-content:space-between;align-items:center;list-style:none}.gas-faq-question::-webkit-details-marker{display:none}.gas-faq-question:after{content:"+";font-size:1.25rem;color:var(--gas-primary);font-weight:700;transition:transform .2s ease}.gas-faq[open] .gas-faq-question:after{transform:rotate(45deg)}.gas-faq-answer{padding:0 1.25rem 1rem;color:var(--gas-text-muted);line-height:1.6;margin:0;font-size:.95rem}@media (max-width: 640px){.gas-calculator-container{padding:1rem}.gas-title{font-size:1.5rem}.gas-description{font-size:.95rem}.gas-section-title{font-size:1.15rem}.gas-mode-tab{padding:.5rem;font-size:.8rem}}