html,body,div,header,footer,nav,main,section,article,h1,h2,h3,h4,h5,h6,p,span,a,img,ul,ol,li,form,input,button,dl,dt,dd,pre,fieldset,textarea,blockquote,th,td{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:#f8f9fa;color:#333;line-height:1.5;min-height:100vh;display:flex;flex-direction:column}.header{background:#fff;padding:24px 16px;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,.1)}.header h1{font-size:24px;font-weight:600;color:#333;margin-bottom:6px}.header p{font-size:14px;color:#666}.container{margin:0 auto;padding:20px 16px;max-width:800px;flex:1}.breadcrumb{font-size:14px;color:#666;}.breadcrumb a{color:#596b78;text-decoration:none;transition:all .2s ease}.breadcrumb a:hover{color:#0056b3;text-decoration:underline}.breadcrumb .separator{margin:0 3px;color:#999}.breadcrumb .current{color:#999}.footer{background:#fff;margin-top:32px;padding:20px 16px;text-align:center;border-top:1px solid #eee}.footer p{font-size:13px;color:#999;margin-bottom:8px}.footer a{color:#666;text-decoration:none;margin:0 12px;font-size:12px}.footer a:hover{color:#333}.calculator-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:32px}.tool-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 8px rgba(0,0,0,.06)}.card-title{font-size:18px;font-weight:600;color:#333;margin-bottom:20px;text-align:center}.form-group{margin-bottom:18px}.form-group label{display:block;font-weight:500;color:#333;margin-bottom:6px;font-size:14px}.form-input{width:100%;padding:12px 16px;border:1px solid #ddd;border-radius:8px;font-size:16px;transition:all .2s ease;background:#fff}.form-input:focus{outline:none;border-color:#007bff;box-shadow:0 0 0 3px rgba(0,123,255,.1)}.gender-selector{display:flex;gap:8px}.gender-option{flex:1;padding:12px 8px;border:1px solid #ddd;border-radius:8px;background:#fff;cursor:pointer;text-align:center;transition:all .2s ease;font-size:14px;font-weight:500}.gender-option:hover{border-color:#007bff;background:#f8f9ff}.gender-option.active{background:#007bff;color:#fff;border-color:#007bff}.btn{width:100%;padding:14px;background:#007bff;color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:500;cursor:pointer;transition:all .2s ease;margin-top:12px}.btn:hover{background:#0056b3;transform:translateY(-1px)}.btn:active{transform:translateY(0)}.result-display{text-align:center;color:#666;padding:40px 20px}.result-display .icon{font-size:48px;margin-bottom:12px;display:block}.result-active{padding:0}.bmr-result{background:linear-gradient(135deg,#007bff,#0056b3);color:#fff;padding:20px;border-radius:10px;text-align:center;margin-bottom:20px}.bmr-value{font-size:32px;font-weight:700;margin-bottom:4px}.bmr-unit{font-size:14px;opacity:.9}.activity-list{margin-top:16px}.activity-item{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;margin:8px 0;background:#f8f9ff;border-radius:8px;border-left:3px solid #007bff}.activity-name{font-weight:500;color:#333}.activity-calories{font-weight:600;color:#007bff}.knowledge-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 8px rgba(0,0,0,.06);margin-top:24px}.knowledge-title{font-size:18px;font-weight:600;color:#333;margin-bottom:20px;text-align:center}.formula-section{background:#f8f9fa;padding:16px;border-radius:8px;margin-bottom:20px;border-left:4px solid #007bff}.formula-title{font-weight:600;margin-bottom:12px;color:#555;font-size:14px}.formula{font-family:monospace;background:#fff;padding:12px;border-radius:6px;margin:8px 0;border:1px solid #e9ecef;font-size:13px;line-height:1.4}.activity-table{width:100%;border-collapse:collapse;margin:16px 0;border-radius:8px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.1)}.activity-table th{background:#007bff;color:#fff;padding:12px;text-align:left;font-weight:500;font-size:14px}.activity-table td{padding:12px;border-bottom:1px solid #f1f3f4;font-size:14px}.activity-table tr:nth-child(even) td{background:#fafbfc}.activity-table tr:hover td{background:#f8f9ff}.tip-box{margin-top:20px;padding:16px;background:#e7f3ff;border-radius:8px;border-left:4px solid #007bff}.tip-box p{margin:0;color:#555;font-size:14px;line-height:1.5}@media (max-width:768px){.calculator-grid{grid-template-columns:1fr;gap:20px}.container{padding:16px 12px}.tool-card,.knowledge-card{padding:20px 16px}.header{padding:20px 12px}.activity-table th,.activity-table td{padding:10px 8px;font-size:13px}.gender-option{padding:10px 6px;font-size:13px}.bmr-value{font-size:28px}}