:root{--bg:#070d17;--surface:#0d1725;--line:#213044;--text:#f5f8fc;--muted:#98a8bd;--cyan:#55eadb;--blue:#4385ff}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;line-height:1.7}a{color:inherit;text-decoration:none}button{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--cyan);outline-offset:5px}.wrap{width:min(1200px,calc(100% - 80px));margin:auto}.header{height:94px;border-bottom:1px solid #ffffff0c;background:#070d17e8;position:sticky;top:0;z-index:20;backdrop-filter:blur(20px)}.nav{height:100%;display:flex;align-items:center;justify-content:space-between;gap:30px}.brand{display:inline-flex;align-items:center;gap:10px;font-size:29px;font-weight:850;letter-spacing:-1px}.brand svg{width:34px;height:34px}.brand 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