*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif,Microsoft YaHei;background-color:#fff;min-height:100vh;transition:background-color .5s ease}.navbar{background-color:#fff;box-shadow:0 2px 10px #0000000d;position:sticky;top:0;z-index:1000;border-bottom:2px solid #4A90E2}.nav-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem}.logo{height:50px;width:auto;border-radius:8px}.nav-menu{display:flex;list-style:none;gap:2rem}.nav-menu a{text-decoration:none;color:#333;font-weight:500;padding:.5rem 1rem;border-radius:20px;transition:all .3s ease}.nav-menu a:hover{background-color:#f0f8ff;color:#4a90e2}.main-content{max-width:1000px;margin:3rem auto;padding:2rem;background-color:#fff;border-radius:16px;box-shadow:0 4px 20px #00000014;line-height:1.8}.main-content h1{text-align:center;color:#2c3e50;margin-bottom:1.5rem;font-size:2.2em}.main-content p{margin-bottom:1.2rem;color:#555;font-size:1.1em}.footer{background-color:#fff;border-top:2px solid #4A90E2;padding:1.5rem 2rem;text-align:center;color:#777;font-size:.9em;margin-top:auto}