:root{--blue:#2563ff;--text:#111827;--muted:#6b7280;--bg:#f3f6fb;--card:#fff;--line:#e5e7eb;--shadow:0 8px 24px rgba(15,23,42,.08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif}a{text-decoration:none;color:inherit}.container{max-width:1420px;margin:0 auto;padding:0 22px}.topbar{height:76px;background:#fff;box-shadow:0 2px 12px rgba(15,23,42,.06);position:sticky;top:0;z-index:20}.nav-wrap{height:76px;display:flex;align-items:center;gap:34px}.logo img{width:190px;height:58px;object-fit:contain}.main-nav{display:flex;align-items:center;gap:32px;font-weight:700}.main-nav a{font-size:16px}.main-nav a.active,.main-nav a:hover{color:var(--blue)}.search-box{margin-left:auto;display:flex;align-items:center;height:44px;background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:0 2px 10px rgba(15,23,42,.06)}.search-box 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