@layer base {
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
        font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
        color: var(--text); line-height: 1.7; background: var(--bg);
        -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
    }
    a { color: var(--primary-600); text-decoration: none; transition: color var(--transition); }
    a:hover { color: var(--gold-500); }
    img { max-width: 100%; height: auto; display: block; }
    .container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
}