*{margin:0;padding:0;box-sizing:border-box}
:root{--fg-main:#4f46e5;--fg-main-d:#4338ca;--fg-bg:#f8fafc;--fg-ink:#0f172a;--fg-mute:#64748b;--fg-line:#e2e8f0;--fg-card:#fff}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--fg-bg);color:var(--fg-ink);line-height:1.85;font-size:16px}
a{color:var(--fg-main);text-decoration:none}
a:hover{color:var(--fg-main-d)}
.fg-wrap{max-width:860px;margin:0 auto;padding:0 20px}
.fg-head{background:#fff;border-bottom:1px solid var(--fg-line);position:sticky;top:0;z-index:20}
.fg-head-in{max-width:860px;margin:0 auto;padding:0 20px;height:62px;display:flex;align-items:center;justify-content:space-between}
.fg-logo{font-size:19px;font-weight:800;color:var(--fg-ink);letter-spacing:.5px}
.fg-logo em{font-style:normal;color:var(--fg-main)}
.fg-nav{display:flex;gap:22px;font-size:15px}
.fg-nav a{color:var(--fg-mute)}
.fg-nav a.on,.fg-nav a:hover{color:var(--fg-main);font-weight:600}
.fg-hero{padding:52px 0 40px;border-bottom:1px solid var(--fg-line)}
.fg-hero h1{font-size:32px;line-height:1.4;font-weight:800;letter-spacing:-.5px}
.fg-hero p{margin-top:16px;color:var(--fg-mute);font-size:16px;max-width:640px}
.fg-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding:36px 0 8px}
.fg-col{background:var(--fg-card);border:1px solid var(--fg-line);border-radius:12px;padding:20px}
.fg-col h2{font-size:17px;font-weight:700;margin-bottom:8px}
.fg-col p{font-size:14px;color:var(--fg-mute);line-height:1.75}
.fg-sec{padding:36px 0 8px}
.fg-sec-h{font-size:20px;font-weight:800;padding-bottom:12px;border-bottom:2px solid var(--fg-line);margin-bottom:20px}
.fg-item{background:var(--fg-card);border:1px solid var(--fg-line);border-radius:12px;padding:22px 24px;margin-bottom:14px;transition:.2s}
.fg-item:hover{border-color:var(--fg-main);box-shadow:0 6px 20px rgba(79,70,229,.08)}
.fg-item h3{font-size:19px;font-weight:700;line-height:1.5;margin-bottom:10px}
.fg-item p{font-size:15px;color:var(--fg-mute)}
.fg-meta{font-size:13px;color:#94a3b8;margin-top:12px}
.fg-bc{font-size:13px;color:var(--fg-mute);padding:20px 0 0}
.fg-bc a{color:var(--fg-mute)}
.fg-art{padding:12px 0 40px}
.fg-art h1{font-size:29px;line-height:1.45;font-weight:800;margin-bottom:14px}
.fg-art .fg-meta{margin:0 0 28px;padding-bottom:18px;border-bottom:1px solid var(--fg-line)}
.fg-art h2{font-size:20px;font-weight:700;margin:30px 0 12px}
.fg-art p{margin-bottom:16px;color:#334155}
.fg-art ul{margin:0 0 16px 22px;color:#334155}
.fg-art li{margin-bottom:9px}
.fg-note{background:#eef2ff;border-left:3px solid var(--fg-main);padding:14px 18px;border-radius:0 8px 8px 0;margin:20px 0;font-size:15px;color:#3730a3}
.fg-foot{background:#fff;border-top:1px solid var(--fg-line);margin-top:48px;padding:26px 0}
.fg-foot-in{max-width:860px;margin:0 auto;padding:0 20px;font-size:13px;color:var(--fg-mute);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
@media(max-width:720px){.fg-cols{grid-template-columns:1fr}.fg-hero h1,.fg-art h1{font-size:25px}.fg-nav{gap:14px;font-size:14px}}