:root{--main:rgb(176,219,245);--deep:#0d3550;--blue:#2c6f9c;--light:#eef8fe;--soft:#f6fbff;--gray:#64748b;--border:#d8edf9;--black:#0f172a;--shadow:0 16px 45px rgba(13,53,80,.08);--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#fff;color:var(--black);line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.mobile-header{height:62px;display:grid;grid-template-columns:52px 1fr 82px;align-items:center;padding:0 14px;background:#fff}.menu-btn{width:42px;height:42px;border:0;background:#fff;border-radius:12px;display:grid;place-items:center;gap:0;padding:9px}.menu-btn span{display:block;width:22px;height:2px;background:var(--deep);margin:2px 0;border-radius:3px}.mobile-logo{justify-self:center}.mobile-logo img{height:34px;max-width:130px;object-fit:contain}.top-action,.main-btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;background:var(--main);color:var(--deep);font-weight:800;box-shadow:0 10px 20px rgba(44,111,156,.14);border:1px solid rgba(13,53,80,.08);transition:.2s}.top-action{height:38px;padding:0 16px;font-size:14px}.main-btn{min-height:48px;padding:0 24px}.top-action:hover,.main-btn:hover{background:#4b9bc4;color:#fff;transform:translateY(-1px)}.mobile-nav{display:none;background:#fff;border-top:1px solid var(--border);padding:8px 14px 14px;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.mobile-nav.show{display:grid}.mobile-nav a{padding:10px 12px;background:var(--soft);border:1px solid var(--border);border-radius:12px;color:var(--deep);font-weight:700}.mobile-nav a.active{background:var(--main)}.desktop-header{display:none}.container,.section-inner{width:min(1180px,calc(100% - 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