:root{--blue:#2962ff;--cyan:#00d4ff;--purple:#7655ff;--ink:#11172c;--muted:#6f7891;--line:#e8ebf3;--bg:#f6f8fc;--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"PingFang SC","Microsoft YaHei",Inter,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.65}body.modal-open{overflow:hidden}a{text-decoration:none;color:inherit}button,input,textarea{font:inherit}img{max-width:100%;display:block}.container{width:min(1200px,calc(100% - 40px));margin:auto}.header{height:76px;background:rgba(255,255,255,.9);backdrop-filter:blur(16px);position:sticky;top:0;z-index:40;border-bottom:1px solid rgba(230,233,243,.8)}.nav-wrap{height:100%;display:flex;align-items:center;gap:34px}.brand img{width:146px;max-height:48px;object-fit:contain}.nav-wrap nav{display:flex;align-items:center;gap:28px;margin-left:auto;font-size:15px}.nav-wrap nav a,.link-button{transition:.2s;color:#303850}.nav-wrap nav 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