:root{--brand: #2f6fed;--brand-deep: #1d4fd1;--ink: #14213d;--ink-2: #5b6b86;--line: #e3e9f3;--bg: #f4f7fc;--card: #ffffff;--green: #1f9d63;--purple: #7a5af8;--orange: #f08c2b;--red: #e5484d;--radius: 20px;--shadow: 0 1px 3px rgba(20, 40, 80, .06), 0 8px 24px rgba(20, 40, 80, .06)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.wrap{max-width:1120px;margin:0 auto;padding:0 24px}.nav{position:sticky;top:0;z-index:20;background:#f4f7fcd1;backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid rgba(227,233,243,.7)}.nav 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