*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif}body{background-color:#f8f9ff;color:#333;line-height:1.6}header{background-color:#fff;box-shadow:0 4px 15px rgba(0,0,0,0.06);position:sticky;top:0;z-index:1000}.nav-container{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;justify-content:space-between;align-items:center;height:70px}.logo{display:flex;align-items:center}.logo-icon{color:#5b6cff;font-size:32px;margin-right:12px}.logo-text{font-size:26px;font-weight:800;background:linear-gradient(135deg,#5b6cff,#8a2be2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-0.5px}.tagline{font-size:14px;color:#8a8a8a;margin-top:2px;font-weight:500}.nav-menu{display:flex;list-style:none}.nav-menu li{margin-left:28px}.nav-menu a{text-decoration:none;color:#555;font-weight:600;font-size:17px;padding:8px 16px;border-radius:30px;transition:all .3s 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0}.section-title{font-size:2.3rem;color:#333;margin-bottom:40px;text-align:center;position:relative;display:inline-block;left:50%;transform:translateX(-50%)}.section-title::after{content:'';display:block;width:100px;height:5px;background:linear-gradient(90deg,#5b6cff,#8a2be2);border-radius:3px;margin:15px auto}.categories-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px}.category-card{background:white;border-radius:16px;padding:30px 25px;box-shadow:0 8px 20px rgba(0,0,0,0.06);transition:all .4s ease;text-align:center;border:2px solid #f0f2ff;position:relative;overflow:hidden}.category-card::before{content:'';position:absolute;top:0;left:0;width:100%;height:5px;background:linear-gradient(90deg,#5b6cff,#8a2be2)}.category-card:hover{transform:translateY(-10px);box-shadow:0 15px 30px 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