:root{--primary:rgb(176,219,245);--primary-dark:#2f6f9e;--deep:#0d2f4f;--text:#1c2833;--muted:#5b6b7a;--light:#f3f9fd;--line:#d8ecf8;--card:#fff;--shadow:0 16px 40px rgba(13,47,79,.08);--radius:20px}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#fff;color:var(--text);line-height:1.75;overflow-x:hidden}a{text-decoration:none;color:inherit}img{max-width:100%;display:block}.container{width:min(1200px,calc(100% - 32px));margin:0 auto}.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 8px 26px rgba(13,47,79,.05)}.mobile-header{height:64px;display:grid;grid-template-columns:70px 1fr 78px;align-items:center;padding:0 14px}.menu-button{width:42px;height:42px;border:0;background:#f2f8fc;border-radius:14px;display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0 11px}.menu-button 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