:root{--primary:rgb(176,219,245);--deep:#0f315c;--blue:#1d5d8f;--light:#eff8fe;--pale:#f7fbff;--line:#d8edf9;--text:#172033;--muted:#64748b;--gray:#f4f7fa;--dark:#0b1f38;--shadow:0 14px 36px rgba(15,49,92,.08);--radius:20px}*{box-sizing:border-box}html,body{margin:0;padding:0;overflow-x:hidden}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:linear-gradient(180deg,#fff 0%,#f7fbff 45%,#fff 100%);line-height:1.75}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(1180px,calc(100% - 32px));margin:0 auto}.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.mobile-header{height:64px;display:grid;grid-template-columns:44px 1fr auto;align-items:center;padding:0 14px;background:#fff}.menu-button{width:40px;height:40px;border:1px solid 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