:root{--blue:#377cf7;--deep:#1b68ff;--dark:#1958c7;--pale:#f1f7ff;--soft:#f6f8fc;--navy:#1b2653;--ink:#30384a;--body:#667187;--muted:#8a94a6;--line:#e7ebf2;--shadow:0 10px 30px rgba(35,78,145,.1)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);line-height:1.75;background:#fff}a{text-decoration:none;color:inherit}button,input,textarea{font:inherit}.container{width:min(1280px,calc(100% - 56px));margin:auto}.nav{height:76px;position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.nav-inner{height:100%;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:11px}.brand-mark{width:41px;height:41px;display:block;object-fit:cover;border-radius:10px;box-shadow:0 3px 10px rgba(0,112,180,.16)}.brand 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