*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #2196f3;--primary-dark: #0d47a1;--primary-light: #64b5f6;--accent: #1976d2;--bg-dark: rgba(255, 255, 255, .6);--bg-darker: rgba(245, 245, 245, .5);--bg-card: rgba(255, 255, 255, .85);--text-white: #1f2937;--text-gray: #6b7280;--text-muted: #9ca3af;--border-color: rgba(33, 150, 243, .3);--glow: 0 0 30px rgba(33, 150, 243, .3);--glow-strong: 0 0 60px rgba(33, 150, 243, .5)}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg-dark);color:var(--text-white);line-height:1.6;overflow-x:hidden;position:relative}.background-container{position:fixed;top:0;left:0;width:100%;height:100%;z-index:-1;overflow:hidden}.background-image{width:100%;height:100%;object-fit:cover;object-position:center;position:absolute;top:0;left:0}.bg-section{background:transparent}.card{background:var(--bg-card);border:1px solid var(--border-color);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}section{background:transparent}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--bg-darker)}::-webkit-scrollbar-thumb{background:var(--primary);border-radius:5px}::-webkit-scrollbar-thumb:hover{background:var(--primary-dark)}