:root{--bg:#050812;--panel:#0b1022;--line:rgba(112,188,255,.22);--text:#eaf4ff;--muted:#9fb3c8;--blue:#33b8ff;--violet:#a463ff;--cyan:#3ef4de;--shadow:0 18px 60px rgba(24,126,255,.18)}*{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 15% 0%,rgba(40,119,255,.24),transparent 32%),radial-gradient(circle at 80% 10%,rgba(164,99,255,.2),transparent 30%),var(--bg);color:var(--text);line-height:1.7}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}section{padding:88px 6vw}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:18px 6vw;background:rgba(5,8,18,.78);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:24px}.brand 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