:root{--paper:#f5f2e9;--paper2:#fbfaf5;--ink:#17383a;--muted:#6d7d79;--cyan:#2d8b8a;--cyan2:#87bbb4;--line:rgba(23,56,58,.14);--red:#a54b45;--shadow:0 18px 50px rgba(29,60,60,.09);--radius:22px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper2);color:var(--ink);font-family:"PingFang SC","Noto Sans SC",system-ui,sans-serif;line-height:1.7}body:before{content:"";position:fixed;inset:0;z-index:-1;opacity:.35;background-image:radial-gradient(circle at 15% 20%,rgba(82,155,151,.12),transparent 28%),radial-gradient(circle at 85% 55%,rgba(193,172,128,.12),transparent 24%)}a{color:var(--cyan);text-decoration:none}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3{font-family:"Songti SC","STSong",serif;line-height:1.25}.nav{height:74px;padding:0 clamp(20px,5vw,80px);display:flex;align-items:center;justify-content:space-between;background:rgba(251,250,245,.86);backdrop-filter:blur(18px);border-bottom:1px solid 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