:root{--bg:#f6f8fc;--card:#fff;--ink:#111827;--muted:#5d6b82;--line:#e7edf6;--blue:#1769e0;--blue2:#0b53ba;--green:#14a06f;--orange:#ff8a1f;--red:#ff4d4f}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:radial-gradient(circle at 12% 0,#eaf3ff 0,transparent 32%),linear-gradient(180deg,#f8fbff 0,#f6f8fc 45%,#fff 100%)}a{color:var(--blue);text-decoration:none}.nav{height:74px;background:rgba(255,255,255,.9);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;backdrop-filter:blur(12px)}.nav-inner{max-width:1180px;margin:auto;height:74px;display:flex;align-items:center;justify-content:space-between;padding:0 24px}.brand{display:flex;align-items:center;gap:12px;font-weight:900;font-size:20px;color:var(--ink)}.brand-icon{width:42px;height:42px;border-radius:14px;box-shadow:0 10px 24px 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