:root{
    --ink:#122436; --ink-soft:#3c5163;
    --paper:#eef2f2; --paper-card:#ffffff; --line:#c9d3d2;
    --delft:#1e3a5f; --delft-deep:#0f2340;
    --gold:#c98a1f; --wine:#8c2a3a; --teal:#1f6f78;
    --radius:3px;
  }
  *{box-sizing:border-box;}
  body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,"Microsoft YaHei",sans-serif;line-height:1.55;}
  h1,h2,.serif{font-family:Georgia,"Microsoft YaHei",serif;}
  .wrap{max-width:860px;margin:0 auto;padding:40px 24px 80px;}
  header.page-head{border-bottom:1px solid var(--line);padding-bottom:28px;margin-bottom:28px;}
  header.page-head h1{font-size:clamp(26px,4vw,34px);font-weight:700;margin:0 0 10px;color:var(--delft-deep);letter-spacing:-0.01em;}
  header.page-head p{max-width:600px;color:var(--ink-soft);font-size:15px;margin:0;}

  .site-nav{background:var(--delft-deep);border-bottom:1px solid #0a1c30;}
  .site-nav-inner{max-width:1080px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;}
  .site-nav .brand{font-family:Georgia,"Microsoft YaHei",serif;font-size:17px;font-weight:700;color:#fff;text-decoration:none;letter-spacing:-0.01em;}
  .site-nav nav{display:flex;gap:4px;flex-wrap:wrap;}
  .site-nav nav a{color:#cdd9e3;text-decoration:none;font-size:13.5px;padding:7px 12px;border-radius:var(--radius);}
  .site-nav nav a:hover{background:rgba(255,255,255,0.08);color:#fff;}
  .site-nav nav a.current{background:rgba(255,255,255,0.14);color:#fff;font-weight:600;}

  .toggle-row{display:flex;gap:10px;margin-bottom:28px;flex-wrap:wrap;}
  .toggle-row button{
    flex:1;min-width:220px;font-family:inherit;font-size:14px;font-weight:600;
    padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius);
    background:#fff;color:var(--ink);cursor:pointer;text-align:left;
  }
  .toggle-row button .sub{display:block;font-size:12px;font-weight:400;color:var(--ink-soft);margin-top:3px;}
  .toggle-row button.active{border-color:var(--delft);background:#eaf0f6;color:var(--delft-deep);}

  .steps{position:relative;}
  .step{
    display:flex;gap:18px;padding-bottom:28px;position:relative;
  }
  .step:last-child{padding-bottom:0;}
  .step::before{
    content:"";position:absolute;left:15px;top:34px;bottom:0;width:1px;background:var(--line);
  }
  .step:last-child::before{display:none;}
  .step .num{
    width:32px;height:32px;border-radius:50%;background:var(--delft);color:#fff;
    display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0;z-index:1;
  }
  .step .content h3{font-size:15.5px;margin:0 0 6px;color:var(--ink);}
  .step .content p{font-size:13.5px;color:var(--ink-soft);margin:0;}

  .card{background:var(--paper-card);border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;margin-bottom:22px;}

  .warn-box{background:#faf3e0;border:1px solid #e6d6a8;border-radius:var(--radius);padding:12px 16px;font-size:13px;color:#8a5f10;margin-bottom:22px;}

  .note{margin-top:20px;font-size:12.5px;color:var(--ink-soft);border-top:1px solid var(--line);padding-top:16px;}