:root{--ink:#142039;--muted:#6e7b91;--blue:#168df2;--cyan:#16c9dc;--line:#e5edf6;--panel:#fff;--soft:#f5f9fd;--orange:#ff8b3d;--green:#18b875;--shadow:0 18px 55px rgba(26,80,125,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:#eaf9ff;min-height:100vh}.ambient{position:fixed;z-index:-1;border-radius:50%;filter:blur(2px)}.ambient-a{width:680px;height:680px;right:-160px;top:-180px;background:radial-gradient(circle,#c4f7fb,transparent 68%)}.ambient-b{width:720px;height:720px;left:-280px;top:360px;background:radial-gradient(circle,#d8eaff,transparent 66%)}.shell{width:min(1180px,calc(100% - 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