:root{--bg: #faf9f6;--bg-2: #f1efe9;--bg-dark: #141414;--ink: #141414;--ink-2: #55534e;--ink-3: #8a8883;--accent: #ff4a17;--line: #e7e4dc;--white: #ffffff;--radius: 16px;--maxw: 1240px;--font-sans: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;--font-serif: "Georgia", "Songti SC", "STSong", "SimSun", serif;--ease: cubic-bezier(.22, 1, .36, 1)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.container{max-width:var(--maxw);margin:0 auto;padding:0 32px}.nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:18px 40px;transition:background .35s var(--ease),padding .35s var(--ease),box-shadow 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