:root{--ink:#101827;--muted:#667085;--line:#dde3ea;--paper:#f4f7fa;--white:#fff;--blue:#2f6df6;--blue2:#0e48ce;--cyan:#43d3ce;--green:#179b70;--amber:#e98b18;--shadow:0 20px 55px rgba(20,35,60,.10);font-family:Inter,"Segoe UI","Noto Sans TC",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;background:linear-gradient(180deg,#f8fafc 0,#eef3f8 100%);overflow-x:hidden}.ambient{position:fixed;border-radius:50%;filter:blur(70px);opacity:.18;pointer-events:none}.ambient-a{width:420px;height:420px;background:#4988ff;right:-140px;top:-180px}.ambient-b{width:330px;height:330px;background:#53d7d1;left:-160px;top:45vh}.topbar{height:72px;padding:0 clamp(20px,5vw,72px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid 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