#app{width:100%;height:100vh;background:linear-gradient(135deg,#FFF5F7 0%,#fff 100%)}:root{--kfc-red: #E4003A;--kfc-red-dark: #C40032;--kfc-red-light: #FFE6EC;--kfc-orange: #FFC72C;--kfc-orange-dark: #E6B328;--kfc-orange-light: #FFF8E6;--primary-color: #E4003A;--primary-gradient: linear-gradient(135deg, #E4003A 0%, #FF2E63 100%);--secondary-color: #FFC72C;--success-color: #52C41A;--danger-color: #FF4D4F;--warning-color: #FAAD14;--white: #ffffff;--gray-100: #F5F5F5;--gray-200: #E0E0E0;--gray-300: #CCCCCC;--gray-400: #999999;--gray-500: #666666;--gray-600: #666666;--gray-700: #333333;--gray-800: #333333;--gray-900: #212529;--font-family: "Microsoft YaHei", Arial, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--border-radius-sm: .25rem;--border-radius-md: .375rem;--border-radius-lg: .5rem;--border-radius-xl: .75rem;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1);--transition-fast: .15s ease;--transition-base: .3s ease;--transition-slow: .5s ease}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;line-height:1.5}a{color:var(--primary-color);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--gray-700)}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;margin-bottom:var(--spacing-md)}h1{font-size:var(--font-size-2xl)}h2{font-size:var(--font-size-xl)}h3{font-size:var(--font-size-lg)}h4{font-size:var(--font-size-base)}p{margin-bottom:var(--spacing-md)}ul,ol{margin-bottom:var(--spacing-md);padding-left:var(--spacing-xl)}input,textarea,select,button{font-family:inherit;font-size:inherit;line-height:inherit}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.container-sm{max-width:400px}.container-md{max-width:768px}.container-lg{max-width:1024px}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.mb-0{margin-bottom:0}.mb-1{margin-bottom:var(--spacing-xs)}.mb-2{margin-bottom:var(--spacing-sm)}.mb-3{margin-bottom:var(--spacing-md)}.mb-4{margin-bottom:var(--spacing-lg)}.mb-5{margin-bottom:var(--spacing-xl)}.mt-0{margin-top:0}.mt-1{margin-top:var(--spacing-xs)}.mt-2{margin-top:var(--spacing-sm)}.mt-3{margin-top:var(--spacing-md)}.mt-4{margin-top:var(--spacing-lg)}.mt-5{margin-top:var(--spacing-xl)}@media (max-width: 768px){.container{padding:0 var(--spacing-sm)}h1{font-size:var(--font-size-xl)}h2{font-size:var(--font-size-lg)}h3{font-size:var(--font-size-base)}}.card{background:var(--white);border-radius:var(--border-radius-lg);padding:var(--spacing-xl);box-shadow:var(--shadow-lg);transition:box-shadow var(--transition-base)}.card:hover{box-shadow:var(--shadow-xl)}.login-page{min-height:100vh;position:relative;overflow:hidden}.login-background{position:absolute;top:0;left:0;right:0;bottom:0;z-index:1}.background-shapes{position:relative;width:100%;height:100%}.shape{position:absolute;border-radius:50%;opacity:.1;background:white}.shape-1{width:300px;height:300px;top:-150px;right:-100px}.shape-2{width:200px;height:200px;bottom:-100px;left:-50px}.shape-3{width:150px;height:150px;top:50%;right:20%}.login-main{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1fr;align-items:center;max-height:800px}.login-brand{padding:var(--spacing-2xl);color:#fff;height:100vh;display:flex;align-items:center;justify-content:center}.brand-content{max-width:500px}.brand-logo{text-align:center;margin-bottom:var(--spacing-2xl)}.logo-icon{font-size:4rem;margin-bottom:var(--spacing-md)}.brand-title{font-size:2.5rem;font-weight:700;margin:0;text-shadow:0 2px 10px rgba(0,0,0,.2)}.brand-description{margin-bottom:var(--spacing-2xl);text-align:center}.brand-description p{font-size:1.1rem;margin-bottom:var(--spacing-sm);opacity:.9}.brand-features{display:flex;flex-direction:column;gap:var(--spacing-md)}.feature-item{display:flex;align-items:center;gap:var(--spacing-sm);font-size:1rem}.feature-icon{background:rgba(255,255,255,.2);width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem}.login-form-section{background:white;height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--spacing-2xl)}.login-form-container{width:100%}.form-header{text-align:center;margin-bottom:var(--spacing-2xl)}.form-title{font-size:2rem;font-weight:700;color:var(--gray-800);margin-bottom:var(--spacing-sm)}.form-subtitle{color:var(--gray-600);font-size:1rem;margin:0}.usb-status-section{margin-bottom:var(--spacing-xl)}.status-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-sm)}.status-label{font-weight:600;color:var(--gray-700)}.status-indicator{width:8px;height:8px;border-radius:50%;background:var(--gray-400)}.status-indicator.connected{background:var(--success-color)}.status-indicator.disconnected{background:var(--danger-color)}.status-indicator.detecting{background:var(--warning-color);animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.login-form{width:100%}.form-field,.form-actions{margin-bottom:var(--spacing-lg)}.error-message{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md);background:#FFF2F0;border:1px solid #FFCCC7;border-radius:var(--border-radius-md);color:var(--danger-color);font-size:.9rem}.error-icon{font-size:1.2rem}.form-footer{text-align:center;padding-top:var(--spacing-lg);border-top:1px solid var(--gray-200)}.footer-text{color:var(--gray-600);font-size:.9rem;margin:0}@media (max-width: 1024px){.login-main{grid-template-columns:1fr}.login-brand{display:none}.login-form-section{height:auto;min-height:100vh}}@media (max-width: 768px){.login-form-section{padding:var(--spacing-lg)}.brand-title{font-size:2rem}.form-title{font-size:1.75rem}}.form-group{margin-bottom:var(--spacing-lg)}.form-label{display:block;margin-bottom:var(--spacing-sm);color:var(--gray-600);font-weight:500;font-size:var(--font-size-sm)}.form-input{width:100%;padding:var(--spacing-md);border:2px solid var(--gray-200);border-radius:6px;font-size:14px;transition:border-color .3s}.form-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #e4003a33}.login-btn{width:100%;padding:12px;background:var(--primary-gradient);color:#fff;border:none;border-radius:6px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s,background-color .2s}.login-btn:hover{transform:translateY(-2px);background:var(--kfc-red-dark)}.login-btn:active{background:var(--kfc-red-dark)}.login-btn:disabled{background:var(--gray-400);color:var(--white);cursor:not-allowed;transform:none}.usb-status{margin:20px 0;padding:15px;border-radius:6px;text-align:center;font-weight:500}.usb-connected{background:#F6FFED;color:#52c41a;border:1px solid #B7EB8F}.usb-disconnected{background:#FFF2F0;color:#ff4d4f;border:1px solid #FFCCC7}.usb-detecting{background:#FFFBE6;color:#faad14;border:1px solid #FFE58F}.error-message{color:#ff4d4f;font-size:14px;text-align:center}.shop-content{display:flex;flex-direction:column;gap:var(--spacing-xl)}.user-info-card{margin-bottom:0}.user-info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-md)}.info-item{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-sm) 0;border-bottom:1px solid var(--gray-200)}.info-item label{font-weight:500;color:var(--gray-600)}.info-item span{color:var(--gray-800)}.product-section{margin-bottom:0}.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-lg)}.product-card{display:flex;flex-direction:column;justify-content:space-between;padding:var(--spacing-lg);border:1px solid var(--gray-200);border-radius:var(--border-radius-md);transition:all var(--transition-base)}.product-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.product-info h3{margin-bottom:var(--spacing-sm);color:var(--gray-800)}.product-price{font-size:var(--font-size-lg);font-weight:600;color:var(--primary-color);margin-bottom:var(--spacing-xs)}.product-stock{color:var(--gray-600);font-size:var(--font-size-sm);margin-bottom:var(--spacing-md)}.buy-button{width:100%}.login-button{width:100%;margin-top:var(--spacing-md)}.loading{display:inline-block;width:20px;height:20px;border:3px solid var(--gray-100);border-top:3px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}