:root{--bg: #f6f9ff;--bg-soft: #eef4ff;--card: #ffffff;--line: #e3eaf6;--text: #10203a;--muted: #5b6b85;--cyan: #2f7df6;--violet: #7c5cff;--green: #16b97a;--radius: 18px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}a{color:inherit;text-decoration:none}.wrap{max-width:1120px;margin:0 auto;padding:0 28px}header{position:sticky;top:0;z-index:20;background:#ffffffd1;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;height:66px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.5px}.brand .dot{width:22px;height:22px;border-radius:7px;background:linear-gradient(135deg,#4aa5ff,var(--violet));box-shadow:0 6px 16px 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