:root{
  --bg:#ffffff; --ink:#1a1a1a; --muted:#6b7280; --line:#e5e7eb;
  --brand:#2563eb; --brand-dark:#1d4ed8; --hot:#f59e0b; --green:#16a34a;
  --soft:#f8fafc; --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.75;-webkit-font-smoothing:antialiased}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* nav */
.nav{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:50}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-weight:800;font-size:20px;color:var(--ink)}
.logo span{color:var(--brand)}
.menu{display:flex;gap:22px}
.menu a{color:var(--muted);font-size:15px}
.menu a.active,.menu a:hover{color:var(--ink);text-decoration:none}

/* hero */
.hero{background:linear-gradient(135deg,#eff6ff 0%,#f8fafc 60%,#fffbeb 100%);padding:72px 0 64px;text-align:center}
.hero-kicker{display:inline-block;font-size:13px;color:var(--brand);background:#dbeafe;border-radius:999px;padding:4px 14px;margin-bottom:16px;font-weight:600}
.hero h1{font-size:40px;line-height:1.3;margin-bottom:14px;letter-spacing:.5px}
.hero-sub{color:var(--muted);font-size:17px;margin-bottom:28px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 28px;border-radius:999px;font-weight:600;font-size:15px;transition:.2s;border:1px solid transparent}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:#fff}

/* sections */
.section{padding:56px 0 8px}
.section-title{font-size:26px;margin-bottom:8px}
.section-desc{color:var(--muted);margin-bottom:28px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{position:relative;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;background:#fff;display:flex;flex-direction:column;transition:.2s}
.card:hover{box-shadow:0 12px 32px rgba(0,0,0,.08)}
.card-hot{border:2px solid var(--hot)}
.badge{position:absolute;top:-13px;left:20px;background:var(--hot);color:#fff;font-size:12px;font-weight:700;padding:3px 12px;border-radius:999px}
.badge-blue{background:var(--brand)}
.badge-green{background:var(--green)}
.card h3{font-size:19px;margin:6px 0 4px}
.tag{font-size:13px;color:var(--muted);margin-bottom:12px}
.card ul{list-style:none;margin-bottom:14px;flex:1}
.card ul li{font-size:14.5px;padding-left:22px;position:relative;margin-bottom:8px;color:#374151}
.card ul li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:700}
.cons{font-size:13px;color:#b45309;background:#fffbeb;border-radius:8px;padding:8px 12px;margin-bottom:16px}
.card .btn{text-align:center}

/* posts */
.posts{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.post{border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:block;color:var(--ink);transition:.2s}
.post:hover{box-shadow:0 12px 32px rgba(0,0,0,.08);text-decoration:none}
.post h3{font-size:17px;margin-bottom:8px;line-height:1.5}
.post p{font-size:14px;color:var(--muted);margin-bottom:12px}
.more{font-size:14px;font-weight:600}

/* faq */
.faq details{border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin-bottom:12px;background:var(--soft)}
.faq summary{font-weight:600;cursor:pointer;font-size:16px}
.faq p{margin-top:10px;color:#4b5563;font-size:15px}

/* article */
.article{max-width:760px;margin:0 auto;padding:48px 20px 24px}
.article h1{font-size:32px;line-height:1.4;margin-bottom:10px}
.article .meta{color:var(--muted);font-size:14px;margin-bottom:28px}
.article h2{font-size:22px;margin:36px 0 12px;padding-top:8px}
.article p{margin-bottom:16px;color:#374151}
.article ul,.article ol{margin:0 0 18px 22px;color:#374151}
.article li{margin-bottom:8px}
.article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px}
.article th,.article td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.article th{background:var(--soft)}
.callout{background:#eff6ff;border-left:4px solid var(--brand);border-radius:0 12px 12px 0;padding:16px 20px;margin:24px 0;font-size:15px}
.callout.warn{background:#fffbeb;border-color:var(--hot)}
.article .cta-box{text-align:center;background:var(--soft);border-radius:var(--radius);padding:32px 20px;margin:32px 0}
.article .cta-box .btn{margin-top:6px}
.back{display:inline-block;margin-bottom:8px;font-size:14px}

/* footer */
.footer{margin-top:64px;border-top:1px solid var(--line);background:var(--soft);padding:32px 0}
.footer p{font-size:13.5px;color:var(--muted);margin-bottom:8px}
.copyright{text-align:center;margin-top:16px}

@media(max-width:820px){
  .cards,.posts{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .menu{gap:14px}
  .menu a{font-size:14px}
}