:root{--primary:#1e6fd9;--primary-dark:#1554a8;--accent:#ff7a45;--text:#1f2937;--muted:#6b7280;--bg:#f5f8fc;--card:#fff;--border:#e5eaf2;--radius:14px;--shadow:0 4px 18px #1e3c7814;--max:1180px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{color:var(--text);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.7}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark)}img{max-width:100%;display:block}.container{max-width:var(--max);margin:0 auto;padding:0 16px}.site-header{z-index:50;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);background:#fffffff2;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;height:64px;display:flex}.logo{color:var(--text);align-items:center;gap:8px;font-size:20px;font-weight:700;display:flex}.logo 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