:root{--bg:#f5f7fb;--card:#fff;--text:#1f2937;--muted:#5f6b7a;--brand:#2454d6;--brand2:#5b2bd6;--line:#e7ebf3;--soft:#eef4ff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',Arial,sans-serif;line-height:1.75}.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.wrap{max-width:1120px;margin:0 auto;padding:0 20px}.nav{display:flex;align-items:center;justify-content:space-between;height:68px}.logo{font-weight:800;font-size:22px;color:#15233d;text-decoration:none}.logo span{color:var(--brand)}.menu{display:flex;gap:18px;align-items:center}.menu a{color:#263244;text-decoration:none;font-size:15px}.menu a:hover,.menu a.active{color:var(--brand)}.cta{background:var(--brand);color:#fff!important;padding:8px 14px;border-radius:999px}.hero{padding:58px 0 36px}.hero-card{background:linear-gradient(135deg,#18213d,#2454d6 58%,#6d38e6);color:#fff;border-radius:24px;padding:46px 44px;box-shadow:0 18px 42px rgba(38,64,124,.18)}.hero h1{font-size:38px;line-height:1.25;margin:0 0 16px}.hero p{max-width:760px;color:#eef3ff;margin:0;font-size:17px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin:24px 0}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:0 10px 28px rgba(31,41,55,.05)}.card h2,.card h3{margin-top:0;line-height:1.35}.card p{color:var(--muted)}.tag{display:inline-block;background:var(--soft);color:var(--brand);padding:4px 10px;border-radius:999px;font-size:13px;margin:0 8px 8px 0}.section{padding:22px 0}.section-title{text-align:center;font-size:28px;margin:8px 0 18px}.btn{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;border-radius:10px;padding:9px 16px;font-weight:600}.btn.secondary{background:#f0f4ff;color:var(--brand)}.list{padding-left:22px;color:var(--muted)}.article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:36px;max-width:920px;margin:30px auto}.article h1{font-size:32px;line-height:1.3;margin-top:0}.article h2{margin-top:32px;border-left:4px solid var(--brand);padding-left:12px}.article p,.article li{color:#4b5563}.crumb{color:#6b7280;font-size:14px;margin:22px 0}.footer{border-top:1px solid var(--line);padding:26px 0;text-align:center;color:#6b7280;font-size:14px;background:#fff;margin-top:40px}.footer a{color:var(--brand);text-decoration:none;margin:0 8px}.note{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:14px;padding:14px 16px}.links a{display:block;padding:10px 0;color:var(--brand);text-decoration:none;border-bottom:1px solid var(--line)}@media(max-width:760px){.nav{height:auto;padding:14px 0;align-items:flex-start}.menu{flex-wrap:wrap;gap:10px}.hero-card{padding:30px 24px}.hero h1{font-size:28px}.grid{grid-template-columns:1fr}.article{padding:24px;margin:20px 0}.article h1{font-size:26px}}