:root{--bg: #f1f6fb;--fg: #0f172a;--muted: rgba(15, 23, 42, .64);--card: rgba(255, 255, 255, .9);--border: rgba(15, 23, 42, .08);--primary: #0f766e;--primary2: #0ea5a6;--shadow: 0 22px 50px rgba(2, 6, 23, .06)}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:var(--fg);background:radial-gradient(1200px 520px at 20% -10%,rgba(45,111,181,.16),transparent 62%),radial-gradient(1000px 520px at 80% -6%,rgba(14,165,166,.16),transparent 60%),radial-gradient(900px 520px at 50% 8%,rgba(14,165,166,.12),transparent 62%),linear-gradient(#f7fbff,var(--bg))}a{color:inherit;text-decoration:none}.container{max-width:1200px;margin:0 auto;padding:0 18px}.topbar{position:sticky;top:0;z-index:50;background:#ffffffc7;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid 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