:root{--bg:#fbfdff;--ink:#101427;--muted:#667085;--pink:#ff4ec9;--blue:#26c6ff;--violet:#8b5cf6;--card:rgba(255,255,255,.74);--line:rgba(120,140,180,.22);--shadow:0 24px 80px rgba(93,120,255,.18)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;background:radial-gradient(circle at 12% 8%,rgba(255,78,201,.16),transparent 28%),radial-gradient(circle at 88% 12%,rgba(38,198,255,.18),transparent 26%),linear-gradient(180deg,#fff 0%,#f7fbff 55%,#fff 100%);color:var(--ink);line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}.container{width:min(1180px,92vw);margin:auto}.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.76);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 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