.gravel-calculator-wrapper{--gravel-primary: #92400e;--gravel-primary-dark: #78350f;--gravel-primary-light: #b45309;--gravel-secondary: #65a30d;--gravel-accent: #0891b2;--gravel-bg: #fef3c7;--gravel-card-bg: #ffffff;--gravel-text: #1c1917;--gravel-text-muted: #78716c;--gravel-border: #fde68a;--gravel-shadow: 0 4px 6px -1px rgba(146, 64, 14, .1), 0 2px 4px -2px rgba(146, 64, 14, .1);--gravel-shadow-lg: 0 10px 15px -3px rgba(146, 64, 14, .15), 0 4px 6px -4px rgba(146, 64, 14, .1);--gravel-radius: 12px;--gravel-radius-lg: 16px}.gravel-calculator-container{max-width:800px;margin:0 auto;padding:2rem;background:var(--gravel-bg);border-radius:var(--gravel-radius-lg)}.gravel-header{text-align:center;margin-bottom:2rem}.gravel-title{font-size:2rem;font-weight:800;color:var(--gravel-text);margin:0 0 .5rem;background:linear-gradient(135deg,var(--gravel-primary),var(--gravel-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.gravel-description{color:var(--gravel-text-muted);font-size:1.05rem;margin:0;line-height:1.6}.gravel-formula-section{background:var(--gravel-card-bg);border-radius:var(--gravel-radius-lg);padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--gravel-shadow)}.gravel-formula-title{font-size:1.1rem;font-weight:700;color:var(--gravel-text);margin:0 0 1rem;text-align:center}.gravel-formula-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}@media (max-width: 640px){.gravel-formula-grid{grid-template-columns:1fr}}.gravel-formula-card{background:linear-gradient(135deg,#fef3c7,#fde68a);border-radius:var(--gravel-radius);padding:1rem;text-align:center;border:1px solid var(--gravel-border)}.gravel-formula-label{font-size:.85rem;font-weight:600;color:var(--gravel-primary);margin:0 0 .5rem}.gravel-formula-math{font-size:.95rem;color:var(--gravel-text);overflow-x:auto;padding:.25rem 0}.gravel-unit-toggle{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem;margin-bottom:1rem;background:var(--gravel-card-bg);padding:.5rem;border-radius:var(--gravel-radius);box-shadow:var(--gravel-shadow)}.gravel-unit-btn{display:flex;flex-direction:column;align-items:center;padding:.75rem;border:2px solid transparent;border-radius:calc(var(--gravel-radius) - 2px);background:#fef3c7;cursor:pointer;transition:all .2s ease}.gravel-unit-btn:hover{background:#fde68a;border-color:var(--gravel-primary-light)}.gravel-unit-btn.active{background:linear-gradient(135deg,var(--gravel-primary),var(--gravel-primary-dark));border-color:var(--gravel-primary);color:#fff}.gravel-unit-label{font-weight:700;font-size:.95rem}.gravel-unit-detail{font-size:.75rem;opacity:.8;margin-top:.125rem}.gravel-type-section{background:var(--gravel-card-bg);border-radius:var(--gravel-radius-lg);padding:1rem;margin-bottom:1.5rem;box-shadow:var(--gravel-shadow)}.gravel-type-title{font-size:.9rem;font-weight:700;color:var(--gravel-text);margin:0 0 .75rem}.gravel-type-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem}@media (max-width: 640px){.gravel-type-grid{grid-template-columns:repeat(2,1fr)}}.gravel-type-btn{display:flex;flex-direction:column;align-items:flex-start;padding:.75rem;border:2px solid var(--gravel-border);border-radius:var(--gravel-radius);background:#fef3c7;cursor:pointer;transition:all .2s ease;text-align:left}.gravel-type-btn:hover{border-color:var(--gravel-primary-light);background:#fde68a}.gravel-type-btn.active{border-color:var(--gravel-primary);background:linear-gradient(135deg,#fde68a,#fef3c7);box-shadow:inset 0 0 0 2px var(--gravel-primary)}.gravel-type-label{font-weight:700;font-size:.85rem;color:var(--gravel-text)}.gravel-type-desc{font-size:.7rem;color:var(--gravel-text-muted);margin-top:.125rem}.gravel-form{background:var(--gravel-card-bg);border-radius:var(--gravel-radius-lg);padding:1.5rem;box-shadow:var(--gravel-shadow);margin-bottom:1.5rem}.gravel-form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}@media (max-width: 480px){.gravel-form-row{grid-template-columns:1fr}}.gravel-input-group{display:flex;flex-direction:column;gap:.375rem;position:relative}.gravel-label{font-size:.875rem;font-weight:600;color:var(--gravel-text)}.gravel-input{padding:.75rem 3.5rem .75rem 1rem;border:2px solid var(--gravel-border);border-radius:var(--gravel-radius);font-size:1rem;color:var(--gravel-text);background:#fef3c7;transition:all .2s ease;width:100%;box-sizing:border-box}.gravel-input:focus{outline:none;border-color:var(--gravel-primary);box-shadow:0 0 0 3px #92400e26;background:#fff}.gravel-input::-moz-placeholder{color:var(--gravel-text-muted);opacity:.6}.gravel-input::placeholder{color:var(--gravel-text-muted);opacity:.6}.gravel-input-suffix{position:absolute;right:1rem;top:2.25rem;font-size:.85rem;color:var(--gravel-text-muted);pointer-events:none}.gravel-presets{margin:1rem 0}.gravel-presets-label{font-size:.85rem;font-weight:600;color:var(--gravel-text-muted);display:block;margin-bottom:.5rem}.gravel-presets-btns{display:flex;flex-wrap:wrap;gap:.5rem}.gravel-preset-btn{padding:.375rem .75rem;border:1px solid var(--gravel-border);border-radius:20px;background:#fef3c7;cursor:pointer;font-size:.8rem;color:var(--gravel-text);transition:all .2s ease}.gravel-preset-btn:hover{background:var(--gravel-primary);color:#fff;border-color:var(--gravel-primary)}.gravel-button-row{display:flex;gap:1rem;margin-top:1.5rem}.gravel-btn{flex:1;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.875rem 1.5rem;border:none;border-radius:var(--gravel-radius);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease}.gravel-btn-primary{background:linear-gradient(135deg,var(--gravel-primary),var(--gravel-primary-dark));color:#fff;box-shadow:var(--gravel-shadow)}.gravel-btn-primary:hover{transform:translateY(-2px);box-shadow:var(--gravel-shadow-lg)}.gravel-btn-secondary{background:#f3f4f6;color:var(--gravel-text);border:2px solid var(--gravel-border)}.gravel-btn-secondary:hover{background:#e5e7eb}.gravel-btn-icon{width:20px;height:20px}.gravel-results{background:var(--gravel-card-bg);border-radius:var(--gravel-radius-lg);padding:1.5rem;box-shadow:var(--gravel-shadow-lg);margin-bottom:1.5rem;border:2px solid var(--gravel-primary-light)}.gravel-results-title{font-size:1.25rem;font-weight:700;color:var(--gravel-text);margin:0 0 1rem;text-align:center}.gravel-results-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:1rem}@media (max-width: 640px){.gravel-results-grid{grid-template-columns:repeat(2,1fr)}}.gravel-result-card{background:linear-gradient(135deg,#fef3c7,#fde68a);border-radius:var(--gravel-radius);padding:1rem;text-align:center;display:flex;flex-direction:column;gap:.25rem}.gravel-result-card.gravel-result-primary{background:linear-gradient(135deg,var(--gravel-primary),var(--gravel-primary-dark));color:#fff}.gravel-result-card.gravel-result-bags{background:linear-gradient(135deg,#d9f99d,#bef264)}.gravel-result-label{font-size:.8rem;font-weight:500;text-transform:uppercase;letter-spacing:.05em;opacity:.8}.gravel-result-value{font-size:1.75rem;font-weight:800;color:var(--gravel-primary-dark)}.gravel-result-card.gravel-result-primary .gravel-result-value{font-size:2.25rem;color:#fff}.gravel-result-card.gravel-result-bags .gravel-result-value{color:#365314}.gravel-result-unit{font-size:.85rem;opacity:.9}.gravel-cost-section{margin-top:1rem}.gravel-cost-card{background:linear-gradient(135deg,#dcfce7,#bbf7d0);border-radius:var(--gravel-radius);padding:1rem;text-align:center}.gravel-cost-label{font-size:.85rem;font-weight:600;color:#166534;display:block;margin-bottom:.25rem}.gravel-cost-value{font-size:1.75rem;font-weight:800;color:#15803d}.gravel-content{margin-top:2rem}.gravel-section{background:var(--gravel-card-bg);border-radius:var(--gravel-radius-lg);padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--gravel-shadow)}.gravel-section-title{font-size:1.35rem;font-weight:700;color:var(--gravel-text);margin:0 0 1rem;padding-bottom:.75rem;border-bottom:2px solid var(--gravel-border)}.gravel-section-text{color:var(--gravel-text);line-height:1.7;margin:0 0 1rem}.gravel-features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-top:1.5rem}@media (max-width: 640px){.gravel-features-grid{grid-template-columns:1fr}}.gravel-feature-card{background:linear-gradient(135deg,#fef3c7,#fde68a);border-radius:var(--gravel-radius);padding:1.25rem;text-align:center;border:1px solid var(--gravel-border)}.gravel-feature-icon{font-size:2rem;display:block;margin-bottom:.75rem}.gravel-feature-title{font-size:1rem;font-weight:700;color:var(--gravel-text);margin:0 0 .5rem}.gravel-feature-desc{font-size:.9rem;color:var(--gravel-text-muted);margin:0;line-height:1.5}.gravel-tips-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-top:1rem}@media (max-width: 768px){.gravel-tips-grid{grid-template-columns:1fr}}.gravel-tip-card{background:#fef3c7;border-radius:var(--gravel-radius);padding:1rem;border-left:4px solid var(--gravel-primary)}.gravel-tip-header{display:flex;align-items:center;gap:.5rem;margin-bottom:.5rem}.gravel-tip-icon{font-size:1.25rem}.gravel-tip-title{font-size:.95rem;font-weight:700;color:var(--gravel-text);margin:0}.gravel-tip-text{font-size:.9rem;color:var(--gravel-text-muted);margin:0;line-height:1.6}.gravel-table-wrapper{overflow-x:auto;margin-top:1rem;border-radius:var(--gravel-radius);border:1px solid var(--gravel-border)}.gravel-table{width:100%;border-collapse:collapse;font-size:.9rem}.gravel-table th{background:linear-gradient(135deg,var(--gravel-primary),var(--gravel-primary-dark));color:#fff;padding:.875rem 1rem;text-align:left;font-weight:600}.gravel-table td{padding:.75rem 1rem;border-bottom:1px solid var(--gravel-border);color:var(--gravel-text)}.gravel-table tr:last-child td{border-bottom:none}.gravel-table tr:nth-child(2n){background:#fef3c7}.gravel-faqs{margin-top:1rem}.gravel-faq{background:#fef3c7;border-radius:var(--gravel-radius);margin-bottom:.75rem;border:1px solid var(--gravel-border);overflow:hidden}.gravel-faq[open]{background:#fff}.gravel-faq-question{padding:1rem 1.25rem;font-weight:600;color:var(--gravel-text);cursor:pointer;display:flex;justify-content:space-between;align-items:center;list-style:none}.gravel-faq-question::-webkit-details-marker{display:none}.gravel-faq-question:after{content:"+";font-size:1.25rem;color:var(--gravel-primary);font-weight:700;transition:transform .2s ease}.gravel-faq[open] .gravel-faq-question:after{transform:rotate(45deg)}.gravel-faq-answer{padding:0 1.25rem 1rem;color:var(--gravel-text-muted);line-height:1.6;margin:0;font-size:.95rem}@media (max-width: 640px){.gravel-calculator-container{padding:1rem}.gravel-title{font-size:1.5rem}.gravel-description{font-size:.95rem}.gravel-section-title{font-size:1.15rem}}