:root{--ink:#10213b;--muted:#64748b;--cyan:#00b8d9;--cyan2:#42d6e8;--blue:#0676d8;--pale:#effbfe;--line:#d8e8ef;--card:#fff;--shadow:0 20px 60px rgba(17,76,105,.12);--radius:24px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:78px}body{margin:0;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;background:#f8fcfd;line-height:1.7}a{color:inherit;text-decoration:none}button{font:inherit}.container{width:min(1160px,calc(100% - 40px));margin:auto}.site-header{position:fixed;z-index:50;top:0;left:0;right:0;background:rgba(248,252,253,.82);backdrop-filter:blur(16px);border-bottom:1px solid rgba(216,232,239,.75)}.nav-wrap{height:72px;width:min(1160px,calc(100% - 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