:root{--bg:#F3FBFF;--surface:#fff;--soft:#F8FCFF;--line:#E2F4FD;--blue:#22AEEA;--blue-dark:#147FB8;--text:#34465C;--muted:#5C6F82;--light:#8797A9;--border:rgba(34,174,234,.12);--shadow:0 16px 38px rgba(31,133,184,.12);--footer:#163B57;--radius:22px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.75}body.drawer-open{overflow:hidden}a{text-decoration:none;color:inherit}img{display:block;max-width:100%}.section-shell{width:min(1180px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}.logo{flex:0 0 auto}.logo 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