:root{--bg:#fbfcff;--ink:#17172a;--muted:#687086;--pink:#ff4db8;--blue:#38c9ff;--violet:#8768ff;--card:rgba(255,255,255,.78);--line:rgba(111,125,170,.18);--shadow:0 24px 70px rgba(79,93,150,.16)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:radial-gradient(circle at 12% 4%,rgba(255,77,184,.22),transparent 32%),radial-gradient(circle at 88% 0,rgba(56,201,255,.2),transparent 34%),linear-gradient(180deg,#fff 0,#f8fbff 48%,#fff 100%);line-height:1.75;overflow-x:hidden}.wrap{width:min(1180px,92vw);margin:auto}.topbar{position:sticky;top:0;z-index:30;backdrop-filter:blur(18px);background:rgba(255,255,255,.84);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 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