:root{
  --bg:#f6f8fb; --card:#ffffff; --text:#16202f; --muted:#5b6b82;
  --line:#e6ecf3; --primary:#1677ff; --primary-d:#0b5ed7;
  --accent:#00c56a; --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--text); line-height:1.7; font-size:16px;
}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-d)}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.logo{font-weight:700;font-size:18px;color:var(--text)}
.logo span{color:var(--primary)}
.site-nav{display:flex;gap:18px;font-size:14px;flex-wrap:wrap}
.site-nav a{color:var(--muted)}
.site-nav a:hover{color:var(--primary)}

/* hero */
.hero{background:#fff;border-bottom:1px solid var(--line);padding:52px 0 44px;text-align:center}
.hero h1{font-size:30px;line-height:1.35;letter-spacing:-.5px;margin-bottom:14px}
.hero p{color:var(--muted);max-width:640px;margin:0 auto 26px;font-size:16px}
.btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-block;padding:13px 28px;border-radius:10px;font-weight:600;font-size:15px;
  background:var(--primary);color:#fff;border:1px solid var(--primary);transition:.15s;
}
.btn:hover{background:var(--primary-d);color:#fff}
.btn.ghost{background:#fff;color:var(--primary);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--primary);color:var(--primary-d)}
.hero .note{margin-top:16px;font-size:13px;color:var(--muted)}

/* sections */
section{padding:44px 0}
section h2{font-size:22px;margin-bottom:8px;letter-spacing:-.3px}
section .sub{color:var(--muted);margin-bottom:24px;font-size:15px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.step .no{width:32px;height:32px;border-radius:50%;background:#eaf2ff;color:var(--primary);
  display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:12px}
.step h3{font-size:16px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14px}

/* content cards */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{font-size:16px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px}

/* faq */
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin-bottom:10px}
.faq-item h3{font-size:15px;margin-bottom:6px;color:var(--text)}
.faq-item p{color:var(--muted);font-size:14.5px}

/* related */
.related{display:flex;gap:12px;flex-wrap:wrap}
.related a{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 18px;font-size:14px}
.related a:hover{border-color:var(--primary)}

/* cta band */
.band{background:#0f2547;border-radius:18px;padding:38px 28px;text-align:center;color:#fff}
.band h2{color:#fff}
.band p{color:#a9bcd8;margin-bottom:22px}
.band .btn{background:var(--accent);border-color:var(--accent)}
.band .btn:hover{background:#00a85a;border-color:#00a85a}
.band .btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}

/* footer */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:36px 0;margin-top:20px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:22px}
.foot-grid h4{font-size:14px;margin-bottom:10px}
.foot-grid a{display:block;color:var(--muted);padding:3px 0}
.foot-grid a:hover{color:var(--primary)}
.copy{color:#94a3b8;font-size:13px;border-top:1px solid var(--line);padding-top:16px}
.icp{color:#94a3b8;font-size:12.5px;margin:6px 0 0;display:flex;flex-wrap:wrap;gap:6px 14px}
.icp a{color:#94a3b8;text-decoration:none}
.icp a:hover{color:#2563eb;text-decoration:underline}

@media(max-width:720px){
  .hero h1{font-size:23px}
  .steps,.cards,.foot-grid{grid-template-columns:1fr}
  .site-header .wrap{height:auto;padding:10px 20px;flex-wrap:wrap}
  section{padding:34px 0}
}

/* 长文内容块 */
.article{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px}
.article h3{font-size:17px;margin:22px 0 8px}
.article h3:first-child{margin-top:0}
.article p{color:#3d4c60;margin-bottom:12px}
.article ul,.article ol{margin:0 0 14px 22px;color:#3d4c60}
.article li{margin-bottom:6px}
.article strong{color:var(--text)}

/* 对比表 */
table.cmp{width:100%;border-collapse:collapse;font-size:14px;margin:6px 0 18px}
table.cmp th,table.cmp td{border:1px solid var(--line);padding:10px 13px;text-align:left;vertical-align:top}
table.cmp th{background:#f2f6fc;font-weight:600;color:var(--text)}
table.cmp td{color:#3d4c60}

/* 提示框 */
.tip{background:#f0fbf5;border-left:3px solid var(--accent);padding:13px 17px;border-radius:8px;color:#2c5c46;font-size:14.5px;margin:0 0 16px}
.warn{background:#fff7ed;border-left:3px solid #e08a2c;padding:13px 17px;border-radius:8px;color:#7a4a12;font-size:14.5px;margin:0 0 16px}

/* 配图 */
.figure{margin:0 0 20px;background:#fbfcfe;border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-align:center}
.figure svg{max-width:100%;height:auto;display:block;margin:0 auto}
.figure figcaption{color:var(--muted);font-size:13px;margin-top:12px}
@media(max-width:720px){
  .article{padding:20px 18px}
}