.top{width:100%;background:#fff;}.header{background-color:#fff;padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;width:1200px;margin:0 auto;}.logo{font-size:1.5rem;font-weight:bold;color:#2c3e50;display:flex;align-items:center;gap:.5rem;}.logo i{color:#3498db;}.nav{display:flex;gap:2rem;}.nav a{text-decoration:none;color:#2c3e50;font-size:1rem;padding:.5rem 1rem;border-radius:4px;transition:all .3s ease;}.nav a:hover{background-color:#f0f2f5;color:#3498db;}.login-btn{background-color:#3498db;color:white;padding:.5rem 1.5rem;border-radius:4px;text-decoration:none;transition:all .3s ease;width:94px;height:36px;display:inline-block;}.login-btn:hover{background-color:#2980b9;}