:root{--bg:#fbfdff;--ink:#111827;--muted:#64748b;--pink:#ff4fc3;--blue:#35d6ff;--violet:#875cff;--card:rgba(255,255,255,.82);--line:rgba(120,130,160,.2);--shadow:0 22px 70px rgba(54,84,180,.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;background:radial-gradient(circle at 12% 5%,rgba(255,79,195,.18),transparent 30%),radial-gradient(circle at 88% 10%,rgba(53,214,255,.23),transparent 34%),linear-gradient(180deg,#fff 0%,#f7fbff 48%,#fff 100%);color:var(--ink);line-height:1.7}.wrap{width:min(1180px,92vw);margin:auto}.topbar{position:sticky;top:0;z-index:20;backdrop-filter:blur(18px);background:rgba(255,255,255,.78);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:16px 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