:root{--ink:#183749;--muted:#637784;--blue:#2864d9;--teal:#148e86;--paper:#f5f7f5;--line:#dbe4e5}*{box-sizing:border-box}html{scroll-behavior:auto;scroll-padding-top:80px}body{margin:0;color:var(--ink);background:var(--paper);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:inherit;text-decoration:none}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 4.3%;position:fixed;inset:0 0 auto;z-index:20;background:rgba(247,249,247,.91);backdrop-filter:blur(18px);border-bottom:1px solid #dbe4e577}.wordmark{display:flex;align-items:center;gap:12px;font-size:19px;font-weight:700;letter-spacing:2px}.mark{font-size:34px;color:var(--teal)}.wordmark small{font-size:10px;letter-spacing:1.4px;margin-left:20px;color:#81929c;font-weight:500}.topbar 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