:root{--primary: #3b82f6;--primary-dark: #2563eb;--primary-light: #dbeafe;--secondary: #64748b;--secondary-light: #f1f5f9;--text-primary: #1e293b;--text-secondary: #64748b;--text-muted: #94a3b8;--background: #f8fafc;--white: #ffffff;--border: #e2e8f0;--border-light: #f1f5f9;--male-color: #3b82f6;--female-color: #ec4899;--male-color-dark: #2563eb;--female-color-dark: #db2777;--spacing-xs: 0.25rem;--spacing-sm: 0.5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--text-xs: 0.75rem;--text-sm: 0.875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--radius-sm: 0.375rem;--radius-md: 0.5rem;--radius-lg: 0.75rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05)}/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:rgba(0,0,0,0)}abbr[title]{border-bottom:none;text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-0.25em}sup{top:-0.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}button,[type=button],[type=reset],[type=submit]{-webkit-appearance:button}button::-moz-focus-inner,[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner{border-style:none;padding:0}button:-moz-focusring,[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}template{display:none}[hidden]{display:none}*{box-sizing:border-box;margin:0;padding:0}body{font-family:"Apple SD Gothic Neo",-apple-system,BlinkMacSystemFont,Roboto,"Noto Sans KR","Pretendard Variable",Pretendard,"Segoe UI",system-ui,sans-serif;font-size:var(--text-base);font-weight:400;line-height:1.6;color:var(--text-primary);background-color:var(--background);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}.container{max-width:900px;margin:0 auto}header{margin-bottom:var(--spacing-2xl)}h1{color:var(--text-primary);font-size:var(--text-3xl);font-weight:700;margin-bottom:var(--spacing-md);text-align:center}.subtitle{color:var(--text-secondary);font-size:var(--text-lg);margin-bottom:var(--spacing-xl);text-align:center}.description{background-color:var(--primary-light);border-radius:var(--radius-md);padding:var(--spacing-lg);margin:var(--spacing-xl) 0;border-left:4px solid var(--primary);box-shadow:var(--shadow-sm)}.description p{color:var(--text-primary);font-size:var(--text-base);line-height:1.7;margin:0}.calculator-card{background-color:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden;margin-bottom:var(--spacing-xl)}.form-section{padding:var(--spacing-xl)}.form-group{margin-bottom:var(--spacing-xl)}label{display:block;margin-bottom:var(--spacing-sm);color:var(--text-primary);font-weight:500;font-size:var(--text-sm)}.gender-form-label{display:block;margin-bottom:var(--spacing-sm);color:var(--text-primary);font-weight:500;font-size:var(--text-sm)}input[type=number]{width:100%;padding:var(--spacing-md);border:1px solid var(--border);border-radius:var(--radius-md);font-size:var(--text-base);color:var(--text-primary);background-color:var(--white);transition:all .2s ease}input[type=number]:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(59,130,246,.1)}.radio-group{display:flex;gap:var(--spacing-md)}.radio-button{flex:1;position:relative}.radio-button input[type=radio]{position:absolute;opacity:0;pointer-events:none}.radio-button label{display:block;text-align:center;padding:var(--spacing-md) 0;background-color:var(--secondary-light);border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease;margin-bottom:0}.radio-button input[type=radio]:checked+label{background-color:var(--primary);color:var(--white)}.radio-button input[type=radio]#male:checked+label{background-color:var(--male-color);color:var(--white)}.radio-button input[type=radio]#female:checked+label{background-color:var(--female-color);color:var(--white)}.radio-button label:hover{background-color:var(--primary);color:var(--white)}.radio-button input[type=radio]#male+label:hover{background-color:var(--male-color-dark)}.radio-button input[type=radio]#female+label:hover{background-color:var(--female-color-dark)}button{width:100%;padding:var(--spacing-md) 0;background-color:var(--primary);color:var(--white);border:none;border-radius:var(--radius-md);font-size:var(--text-base);font-weight:500;cursor:pointer;transition:all .2s ease}button:hover{background-color:var(--primary-dark);transform:translateY(-1px)}button:active{transform:translateY(0)}#calculate-btn{background-color:var(--text-primary);font-weight:600}#calculate-btn:hover{background-color:var(--secondary)}.result-card{display:none;background-color:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-xl);animation:fadeIn .3s ease-in-out}.result-card.show{display:block}.result-card h2{color:var(--text-primary);margin-bottom:var(--spacing-lg);font-size:var(--text-2xl);font-weight:600;text-align:center}.bmr-value{display:flex;align-items:center;justify-content:center;font-size:var(--text-4xl);font-weight:700;color:var(--primary);margin:var(--spacing-xl) 0;gap:var(--spacing-sm)}.activity-levels{background:var(--secondary-light);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-top:var(--spacing-lg)}.activity-levels h3{color:var(--text-primary);margin-bottom:var(--spacing-md);font-size:var(--text-lg);font-weight:600}.level-item{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md) 0;border-bottom:1px solid var(--border)}.level-item:last-child{border-bottom:none}.level-label{color:var(--text-secondary);font-size:var(--text-sm)}.level-value{font-weight:700;color:var(--primary);font-size:var(--text-base)}.info-section{margin-top:var(--spacing-2xl)}.info-card{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);margin-bottom:var(--spacing-xl);padding:var(--spacing-xl)}.info-card h2{color:var(--text-primary);margin-bottom:var(--spacing-lg);font-size:var(--text-2xl);font-weight:600;border-bottom:2px solid var(--border-light);padding-bottom:var(--spacing-md)}.info-card h3{color:var(--text-primary);font-size:var(--text-xl);font-weight:600;margin-top:var(--spacing-lg);margin-bottom:var(--spacing-md)}.info-card h4{color:var(--text-primary);font-size:var(--text-lg);font-weight:500;margin-top:var(--spacing-md);margin-bottom:var(--spacing-sm)}.info-card p,.info-card li{color:var(--text-secondary);line-height:1.7;margin-bottom:var(--spacing-md)}.info-card ul{padding-left:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.info-card li{margin-bottom:var(--spacing-sm)}.formula-box{background:var(--secondary-light);border-radius:var(--radius-md);padding:var(--spacing-lg);margin:var(--spacing-lg) 0;border-left:3px solid var(--primary)}.formula-box h3{color:var(--text-primary);margin-top:0;margin-bottom:var(--spacing-md)}.formula-box p{font-family:"Courier New",monospace;background-color:var(--white);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);font-size:var(--text-sm);margin-bottom:var(--spacing-sm);border:1px solid var(--border)}.note{margin-top:var(--spacing-lg);padding:var(--spacing-md);background:var(--primary-light);border-radius:var(--radius-md);color:var(--text-secondary);font-size:var(--text-sm);border-left:3px solid var(--primary)}.steps-container{margin:var(--spacing-xl) 0}.step{display:flex;margin-bottom:var(--spacing-xl);align-items:flex-start}.step:last-child{margin-bottom:0}.step-number{background-color:var(--primary);color:var(--white);width:36px;height:36px;border-radius:var(--radius-full);display:flex;justify-content:center;align-items:center;font-weight:600;font-size:var(--text-lg);flex-shrink:0;margin-right:var(--spacing-md);margin-top:var(--spacing-xs)}.step-content{flex:1}.step-content h3{color:var(--text-primary);margin-top:0;margin-bottom:var(--spacing-sm);font-size:var(--text-lg)}.usage-tips h3{color:var(--text-primary);margin-top:var(--spacing-lg);margin-bottom:var(--spacing-md);font-size:var(--text-lg);font-weight:600}.usage-tips ul{padding-left:var(--spacing-lg)}.usage-tips li{margin-bottom:var(--spacing-sm);line-height:1.7}.faq-item{margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--border-light)}.faq-item:last-child{border-bottom:none}.faq-item h3{color:var(--text-primary);margin-bottom:var(--spacing-sm);font-size:var(--text-base);font-weight:600}.faq-item p{color:var(--text-secondary);margin-bottom:0}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.container{padding:var(--spacing-lg) var(--spacing-md)}h1{font-size:var(--text-xl)}.subtitle{font-size:var(--text-base)}.form-section,.result-card,.info-card{padding:var(--spacing-md)}.bmr-value{font-size:var(--text-2xl)}button{padding:var(--spacing-md) 0}.radio-group{flex-direction:column;gap:var(--spacing-sm)}.level-item{flex-direction:column;align-items:flex-start;gap:var(--spacing-xs)}.step{flex-direction:column;text-align:center}.step-number{margin-bottom:var(--spacing-sm);margin-right:0}@media(min-width: 768px){.container{padding:var(--spacing-2xl) var(--spacing-lg)}h1{font-size:var(--text-2xl)}.form-section,.result-card,.info-card{padding:var(--spacing-lg)}.bmr-value{font-size:var(--text-3xl)}button{padding:var(--spacing-md) 0}.radio-group{flex-direction:row;gap:var(--spacing-md)}.level-item{flex-direction:row;align-items:center;gap:0}.step{flex-direction:row;text-align:left}.step-number{margin-bottom:0;margin-right:var(--spacing-md)}}@media(min-width: 1024px){h1{font-size:var(--text-3xl)}.subtitle{font-size:var(--text-lg)}.form-section,.result-card,.info-card{padding:var(--spacing-xl)}.bmr-value{font-size:var(--text-4xl)}}footer{text-align:center;color:var(--text-muted);font-size:var(--text-sm);margin-top:var(--spacing-2xl);padding-top:var(--spacing-lg);border-top:1px solid var(--border)}footer p{margin-bottom:var(--spacing-sm)}footer p:last-child{margin-bottom:0}