:root{--ink:#1d1d1f;--ink2:#424245;--ink3:#6e6e73;--line:#d2d2d7;--line2:#e8e8ed;--bg:#ffffff;--panel:#f5f5f7;--blue:#0071e3;--blue-d:#0058b0;--blue-l:#eaf3ff;--green:#1e8e3e;--green-l:#e7f5ec;--orange:#b25e00;--orange-l:#fff4e5;--radius:16px;--max:920px}*{box-sizing:border-box;margin:0;padding:0}body,html{font-family:-apple-system,BlinkMacSystemFont,SF Pro SC,PingFang SC,Helvetica Neue,Microsoft YaHei,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.container{width:min(100% - 40px,var(--max));margin:0 auto}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:rgba(255,255,255,.86);-webkit-backdrop-filter:saturate(180%) blur(16px);backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid var(--line2)}.site-header .inner{justify-content:space-between;height:56px;width:min(100% - 40px,var(--max));margin:0 auto}.brand,.site-header .inner{display:flex;align-items:center}.brand{gap:10px;font-weight:700;color:var(--ink)}.brand,.brand:hover{text-decoration:none}.logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(145deg,#0a84ff,#5e5ce6);color:#fff;display:grid;place-items:center;font-size:14px;font-weight:800}.nav-link{color:var(--ink3);font-size:14px;margin-left:16px}.site-footer{margin-top:64px;border-top:1px solid var(--line2);padding:28px 0 40px;color:var(--ink3);font-size:12.5px}.site-footer .disclaimer{background:var(--panel);border-radius:var(--radius);padding:14px 16px;margin-bottom:12px;line-height:1.7}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;border-radius:980px;padding:12px 22px;font-size:15px;font-weight:600;transition:.15s ease}.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover{background:var(--blue-d);text-decoration:none}.btn-ghost{background:var(--panel);color:var(--ink)}.btn-ghost:hover{background:var(--line2);text-decoration:none}.btn:disabled{opacity:.45;cursor:not-allowed}.hero{min-height:calc(100vh - 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