*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.header{z-index:100;background:#fff;border-bottom:1px solid #eee;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;max-width:1200px;height:64px;margin:0 auto;padding:0 20px;display:flex}.logo{color:#667eea;font-size:20px;font-weight:700;text-decoration:none}.nav{gap:24px;display:flex}.nav a{color:#333;font-size:14px;text-decoration:none}.nav a:hover{color:#667eea}.main{min-height:calc(100vh - 128px)}.footer{color:#999;text-align:center;background:#333;padding:20px;font-size:13px}