:root{--primary-color: #1890ff;--primary-hover: #096dd9;--secondary-color: #fff;--text-primary: #333;--text-secondary: #666;--bg-light: #f5f5f5;--bg-white: #fff;--border-color: #e8e8e8;--shadow: 0 2px 8px rgba(0, 0, 0, .1);--radius: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:var(--text-primary);background:var(--bg-light);line-height:1.6}a{text-decoration:none;color:inherit}button{cursor:pointer;border:none;outline:none;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 20px}.header{background:var(--bg-white);box-shadow:var(--shadow);position:sticky;top:0;z-index:100}.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}.logo{font-size:24px;font-weight:700;color:var(--primary-color)}.nav{display:flex;gap:30px}.nav a{font-size:15px;color:var(--text-primary);transition:color .3s}.nav a:hover{color:var(--primary-color)}.header-actions{display:flex;gap:15px;align-items:center}.btn{padding:10px 20px;border-radius:var(--radius);font-size:14px;font-weight:500;transition:all .3s}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-outline{border:1px solid var(--primary-color);color:var(--primary-color);background:transparent}.btn-outline:hover{background:var(--primary-color);color:#fff}.hero{background:linear-gradient(135deg,var(--primary-color) 0%,#40a9ff 100%);color:#fff;padding:80px 0;text-align:center}.hero h1{font-size:48px;margin-bottom:20px}.hero p{font-size:18px;margin-bottom:30px;opacity:.9}.hero-buttons{display:flex;gap:15px;justify-content:center}.hero .btn-primary{background:#fff;color:var(--primary-color)}.hero .btn-primary:hover{background:var(--bg-light)}.features{padding:60px 0;background:var(--bg-white)}.section-title{text-align:center;font-size:32px;margin-bottom:40px;color:var(--text-primary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:30px}.feature-card{padding:30px;background:var(--bg-light);border-radius:var(--radius);text-align:center;transition:transform .3s,box-shadow .3s}.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}.feature-icon{font-size:48px;margin-bottom:20px}.feature-card h3{font-size:20px;margin-bottom:10px}.feature-card p{color:var(--text-secondary);font-size:14px}.products{padding:60px 0}.products-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:30px}.product-card{background:var(--bg-white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s}.product-card:hover{transform:translateY(-5px)}.product-image{width:100%;height:250px;background:var(--bg-light);display:flex;align-items:center;justify-content:center;color:var(--text-secondary)}.product-info{padding:20px}.product-info h3{font-size:16px;margin-bottom:10px}.product-price{font-size:18px;color:var(--primary-color);font-weight:700}.footer{background:#1a1a1a;color:#fff;padding:40px 0 20px}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;margin-bottom:30px}.footer h4{font-size:16px;margin-bottom:20px}.footer ul{list-style:none}.footer li{margin-bottom:10px}.footer a{color:#999;font-size:14px}.footer a:hover{color:#fff}.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #333;color:#999;font-size:14px}.auth-container{max-width:400px;margin:60px auto;padding:40px;background:var(--bg-white);border-radius:var(--radius);box-shadow:var(--shadow)}.auth-container h2{text-align:center;margin-bottom:30px}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-size:14px;color:var(--text-secondary)}.form-group input{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:var(--radius);font-size:14px}.form-group input:focus{outline:none;border-color:var(--primary-color)}.auth-container .btn{width:100%;padding:14px;font-size:16px}.auth-switch{text-align:center;margin-top:20px;font-size:14px;color:var(--text-secondary)}.auth-switch a{color:var(--primary-color)}@media (max-width: 768px){.header-inner{flex-wrap:wrap}.nav{display:none}.hero h1{font-size:32px}.hero-buttons{flex-direction:column}}