:root{--bg:#f7f8fa;--panel:#fff;--ink:#101319;--muted:#68707d;--line:#e6e8ec;--brand:#2f66ff;--brand2:#7b4dff;--soft:#eef3ff;--radius:18px;--shadow:0 14px 40px rgba(20,28,45,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.55 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}a{color:inherit;text-decoration:none}.wrap{width:min(1180px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid rgba(230,232,236,.85)}.nav{height:68px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px}.brand-mark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}.nav 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