:root{--brand:#5B5FEF;--brand-deep:#323A8C;--blue:#3B82F6;--gold:#E6B85C;--ink:#20233F;--text:#1F2937;--muted:#667085;--soft:#98A2B3;--line:rgba(91,95,239,.12);--bg:#fff;--bg-soft:#F8FAFC;--bg-blue:#F3F6FF;--bg-warm:#FFF9EE;--footer:#14172A;--shadow:0 16px 40px rgba(32,35,63,.09);--radius:22px;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}body.menu-open{overflow:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}.site-header{position:sticky;top:0;z-index:9999;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);box-shadow:0 8px 24px rgba(32,35,63,.08);border-bottom:1px solid rgba(91,95,239,.08)}.header-inner{max-width:var(--max);height:76px;margin:auto;padding:0 22px;display:grid;grid-template-columns:180px 1fr auto;align-items:center;gap:20px}.brand 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