:root{--wood-primary: #8B5A2B;--wood-secondary: #D2B48C;--wood-dark: #5C4033;--wood-light: #F4E4BC;--text-color: #333;--bg-color: #f9f9f9;--card-bg: #ffffff;--error-color: #d32f2f}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-color);display:flex;justify-content:center;min-height:100vh}.app-container{width:100%;max-width:480px;padding:20px;box-sizing:border-box}.app-header{text-align:center;margin-bottom:20px}.logo{max-width:200px;height:auto;cursor:pointer;transition:transform .2s}.logo:hover{transform:scale(1.05)}h1{font-size:1.5rem;color:var(--wood-dark);margin-top:10px}.calculator-card{background:var(--card-bg);border-radius:16px;padding:24px;box-shadow:0 4px 20px #00000014;border:1px solid var(--wood-secondary)}.toggles-container{display:flex;justify-content:space-between;margin-bottom:24px;gap:10px}.toggle-group{display:flex;flex-direction:column;gap:6px;flex:1}.toggle-group label{font-size:.85rem;color:#666;font-weight:500}.toggle-buttons{display:flex;background:#eee;border-radius:8px;padding:2px}.toggle-buttons button{flex:1;border:none;background:transparent;padding:8px;border-radius:6px;cursor:pointer;font-weight:600;color:#666;transition:all .2s}.toggle-buttons button.active{background:var(--wood-primary);color:#fff;box-shadow:0 2px 4px #0000001a}.inputs-container{display:flex;flex-direction:column;gap:16px;margin-bottom:24px}.input-group{display:flex;flex-direction:column;gap:6px}.input-group label{font-size:.9rem;font-weight:600;color:var(--wood-dark)}.input-group input{padding:12px;border:2px solid #ddd;border-radius:8px;font-size:1.1rem;transition:border-color .2s}.input-group input:focus{border-color:var(--wood-primary);outline:none}.error-message{background:#ffebee;color:var(--error-color);padding:10px;border-radius:8px;text-align:center;margin-bottom:16px;font-size:.9rem}.results-container{background:var(--wood-light);border-radius:12px;padding:20px;text-align:center}.result-item{display:flex;flex-direction:column;gap:4px}.result-item.primary{margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid rgba(92,64,51,.2)}.result-item.primary .result-value{font-size:3rem;font-weight:800;color:var(--wood-dark)}.secondary-results{display:grid;grid-template-columns:1fr 1fr;gap:16px}.result-label{font-size:.85rem;text-transform:uppercase;letter-spacing:.5px;color:#777}.result-value{font-size:1.2rem;font-weight:700;color:var(--wood-dark)}.mode-indicator{margin-top:16px;font-size:.8rem;color:#888;font-style:italic}