:root{
  --ink:#0E1B2A; --navy:#0E2A4E; --mint:#00C98A; --mint-soft:#E6FBF4;
  --muted:#5B6B7C; --line:#E4EAF0; --bg:#F6F8FA;
}
*{box-sizing:border-box}
html,body{overflow-x:hidden}
body{margin:0;background:#fff;color:var(--ink);
  font-family:"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;line-height:1.75;
  -webkit-text-size-adjust:100%}
a{color:var(--navy);text-decoration:none}
img{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 28px}

/* ---------- 顶栏（手机折叠菜单，纯 CSS） ---------- */
.nav{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.nav .wrap{display:flex;align-items:center;height:62px;position:relative}
.logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:800;color:var(--ink)}
.logo i{width:12px;height:12px;border-radius:3px;background:var(--mint);display:block}
.nav .links{margin-left:auto;display:flex;align-items:center;gap:24px;font-size:15px;color:var(--muted)}
.nav .links a:hover{color:var(--ink)}
.btn{display:inline-block;background:var(--mint);color:#04321F;font-weight:800;
  padding:11px 20px;border-radius:10px;white-space:nowrap}
.btn.ghost{background:#fff;color:var(--navy);border:1.5px solid var(--navy)}
.navtog{display:none}
.navbtn{display:none;margin-left:auto;font-size:22px;line-height:1;cursor:pointer;
  padding:8px 12px;border:1px solid var(--line);border-radius:10px;color:var(--ink)}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(135deg,#0A1F3C 0%,#0E2A4E 45%,#123C63 100%);
  color:#fff;padding:76px 0 84px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-160px;top:-120px;width:620px;height:620px;
  border-radius:50%;background:radial-gradient(circle,rgba(0,201,138,.30),rgba(0,201,138,0) 68%)}
.hero h1{font-size:46px;line-height:1.28;margin:0 0 18px;font-weight:900;letter-spacing:1px}
.hero p.lead{font-size:19px;color:rgba(255,255,255,.84);margin:0 0 30px;max-width:720px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap;align-items:center;position:relative;z-index:2}
.hero .hint{margin-top:18px;font-size:14px;color:rgba(255,255,255,.6)}
.tags{margin-top:34px;display:flex;gap:10px;flex-wrap:wrap;position:relative;z-index:2}
.tag{font-size:14px;font-weight:700;color:#9BF0D2;background:rgba(0,201,138,.14);
  border:1px solid rgba(0,201,138,.45);border-radius:999px;padding:7px 15px}

/* ---------- 区块 ---------- */
section{padding:66px 0}
section.alt{background:var(--bg)}
h2{font-size:30px;margin:0 0 10px;font-weight:900}
.sub{color:var(--muted);margin:0 0 34px;font-size:16px}
.grid{display:grid;gap:20px}
.g4{grid-template-columns:repeat(4,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15px}
.dot{width:34px;height:34px;border-radius:9px;background:var(--mint-soft);
  color:#04795A;display:flex;align-items:center;justify-content:center;font-weight:900;margin-bottom:14px}
.price{border:1px solid var(--line);border-radius:14px;padding:24px;background:#fff}
.price .n{font-size:32px;font-weight:900;color:var(--navy)}
.price ul{padding-left:18px;margin:14px 0 0;color:var(--muted);font-size:15px}
.faq{border-top:1px solid var(--line);padding:18px 0}
.faq b{display:block;font-size:16px;margin-bottom:6px}
.faq span{color:var(--muted);font-size:15px}

/* ---------- 页脚 ---------- */
footer{background:var(--navy);color:rgba(255,255,255,.82);padding:46px 0 30px;margin-top:20px}
footer a{color:rgba(255,255,255,.9)}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}
footer h4{color:#fff;font-size:15px;margin:0 0 12px}
footer .meta{font-size:13.5px;line-height:2;color:rgba(255,255,255,.62)}
footer .bt{border-top:1px solid rgba(255,255,255,.14);margin-top:30px;padding-top:18px;
  font-size:13px;color:rgba(255,255,255,.56);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer img{vertical-align:-3px}

/* ---------- 协议页 ---------- */
.doc{padding:56px 0 80px}
.doc h1{font-size:32px;margin:0 0 6px;line-height:1.3}
.doc .upd{color:var(--muted);font-size:14px;margin-bottom:30px}
.doc h2{font-size:20px;margin:32px 0 10px}
.doc p,.doc li{color:#37474F;font-size:15.5px}
.doc ul{padding-left:22px}
.doc a{word-break:break-all}
.toc{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:16px 20px;
  margin-bottom:26px;font-size:14.5px}

/* ---------- 平板 ---------- */
@media(max-width:1024px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
}

/* ---------- 手机 ---------- */
@media(max-width:760px){
  .wrap{padding:0 18px}
  .nav .wrap{height:56px}
  .logo{font-size:16px}
  .navbtn{display:block}
  .nav .links{display:none;position:absolute;top:56px;left:-18px;right:-18px;margin:0;
    flex-direction:column;align-items:stretch;gap:0;background:#fff;
    border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(16,32,58,.08);padding:6px 0}
  .nav .links a{padding:13px 18px;font-size:16px;border-bottom:1px solid var(--line)}
  .nav .links a:last-child{border-bottom:0}
  .nav .links a.btn{margin:12px 18px 16px;text-align:center;border-radius:10px;border-bottom:0}
  .navtog:checked ~ .links{display:flex}

  .hero{padding:44px 0 48px}
  .hero h1{font-size:29px;letter-spacing:0}
  .hero p.lead{font-size:16px;margin-bottom:22px}
  .hero .cta{gap:10px}
  .hero .cta .btn{flex:1 1 auto;text-align:center}
  .hero .tags{margin-top:22px;gap:8px}
  .tag{font-size:13px;padding:6px 12px}

  section{padding:40px 0}
  h2{font-size:23px}
  .sub{font-size:14.5px;margin-bottom:24px}
  .g4,.g3,.g2{grid-template-columns:1fr}
  .grid{gap:14px}
  .card,.price{padding:18px}
  .price .n{font-size:26px}
  .doc{padding:30px 0 60px}
  .doc h1{font-size:24px}
  .doc h2{font-size:18px;margin:26px 0 8px}
  .doc p,.doc li{font-size:15px}
  .toc{padding:14px 16px;font-size:14px}
  footer{padding:34px 0 24px}
  footer .cols{grid-template-columns:1fr;gap:22px}
  footer .bt{flex-direction:column;gap:8px;font-size:12.5px}
}