:root{--c-brand:#1e3a8a;--c-brand-deep:#162a63;--c-brand-2:#2563eb;--c-cyan:#2dd4bf;--c-dark:#0b1220;--c-text:#0f172a;--c-text-2:#475569;--c-text-3:#94a3b8;--c-line:#0f172a14;--c-bg:#fff;--c-bg-soft:#f6f8fc;--grad-brand:linear-gradient(135deg, #2563eb 0%, #1d4ed8 60%, #1e3a8a 100%);--grad-cyan:linear-gradient(135deg, #2563eb 0%, #22d3ee 100%);--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;--num-font:"SF Mono", "Cascadia Mono", Consolas, "Courier New", monospace;--r-lg:16px;--r-md:10px;--r-full:999px;--shadow-sm:0 1px 2px #0f172a0a, 0 1px 3px #0f172a0f;--shadow-md:0 6px 16px -4px #1e3a8a1f, 0 2px 6px #0f172a0a;--shadow-lg:0 20px 40px -12px #1e3a8a40;--ease:cubic-bezier(.4, 0, .2, 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0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.site-header{z-index:60;-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--c-line);background:#ffffffdb;position:sticky;top:0}.site-header__inner{align-items:center;gap:32px;height:64px;display:flex}.site-logo{flex-shrink:0;align-items:center;gap:10px;text-decoration:none;display:inline-flex}.site-logo__img{object-fit:contain;width:auto;max-width:220px;height:40px;display:block}.site-logo__mark{background:radial-gradient(circle at 32% 28%, #2f5bd8, var(--c-brand) 68%);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:34px;height:34px;font-size:16px;font-weight:800;display:inline-flex;box-shadow:0 4px 10px -2px 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