:root{--bg:#0b1220;--bg2:#0e1628;--text:#e6edf3;}html,body{margin:0;background:linear-gradient(180deg,var(--bg),var(--bg2));color:var(--text);font:16px/1.6 system-ui} .container{max-width:1120px;margin:0 auto;padding:24px} header{position:sticky;top:0;background:rgba(0,0,0,.3);backdrop-filter:blur(8px)} .nav{display:flex;justify-content:space-between} .menu{display:flex;gap:14px}