:root{--navy-950:#061A33;--navy-900:#0A2444;--navy-800:#0F3366;--navy-700:#1A4B94;--teal-700:#1558B8;--teal-600:#1F6FD2;--teal-500:#2E83DC;--teal-300:#8FBBEC;--teal-100:#E1ECFA;--sky-50:#F2F7FC;--sky-100:#E4EEF9;--line:#D8E4F0;--ink:#0F2540;--muted:#5A7184;--bg:#fff;--radius:12px;--shadow-sm:0 2px 10px rgba(10,36,68,.06);--shadow:0 14px 40px rgba(10,36,68,.12);--font-display:'Barlow','Noto Sans SC',sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Noto Sans SC',-apple-system,sans-serif;color:var(--ink);line-height:1.6;background:#fff}.en-only{display:block}.zh-only{display:none}html[data-lang="zh"] .en-only{display:none}html[data-lang="zh"] .zh-only{display:block}img{max-width:100%;display:block}a{text-decoration:none;color:inherit}.container{max-width:1200px;margin:0 auto;padding:0 24px}h1,h2,h3,h4{font-family:var(--font-display)}.topbar{background:var(--navy-900);color:#cdd9e8;font-size:12.5px;padding:6px 0}.topbar 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