:root{--bg:#f7f9fb;--card:#fff;--accent:#0b5cff;--muted:#556;--radius:12px}
    /* reserve space for the fixed top nav */
    body{font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans KR', Arial;line-height:1.6;background:var(--bg);color:#1b1b1b;margin:0;padding:0;padding-top:72px}
    .container{max-width:980px;margin:36px auto;padding:24px}
    /* Top navigation */
    .topnav{position:fixed;left:0;right:0;top:0;height:64px;background:linear-gradient(180deg,rgba(255,255,255,0.98),#ffffff);display:flex;align-items:center;justify-content:center;box-shadow:0 6px 18px rgba(20,30,60,0.06);z-index:60}
    .topnav .wrap{width:100%;max-width:980px;display:flex;align-items:center;justify-content:space-between;padding:0 18px}
    .brand{font-weight:700;color:var(--accent);text-decoration:none;font-size:18px}
    .navlinks{display:flex;gap:12px}
    .navlinks a{color:#223;padding:8px 10px;text-decoration:none;border-radius:8px}
    .navlinks a:hover{background:#f0f6ff}
    .nav-toggle{display:none;border:0;background:transparent;font-size:20px}
    header{display:flex;gap:20px;align-items:center}
    .avatar{width:140px;height:140px;border-radius:12px;overflow:hidden;flex:0 0 140px;background:linear-gradient(135deg,#e6f0ff,#ffffff);display:flex;align-items:center;justify-content:center}
    .card{background:var(--card);padding:18px;border-radius:var(--radius);box-shadow:0 6px 18px rgba(20,30,60,0.06)}
    
    h1{margin:0;font-size:26px}
    h2{margin:14px 0 8px;font-size:18px;color:var(--accent)}
    p{margin:8px 0;color:#222}
    nav.quick{margin-top:12px;display:flex;gap:10px;flex-wrap:wrap}
    a.button{display:inline-block;padding:8px 12px;background:var(--accent);color:#fff;border-radius:8px;text-decoration:none}
    .two-col{display:grid;grid-template-columns:1fr 320px;gap:18px;margin-top:18px}
    .section{margin-bottom:16px}
    ul{margin:8px 0 8px 20px}
    footer{margin-top:28px;color:var(--muted);font-size:14px}
    @media(max-width:880px){.two-col{grid-template-columns:1fr}.avatar{width:110px;height:110px;flex:0 0 110px}}
    @media(max-width:700px){
      .navlinks{display:none}
      .nav-toggle{display:block}
    }
    /* Footer styles */
    .site-footer{background:#ffffff;padding:26px 0;border-top:1px solid #eef3fb;margin-top:36px}
    .site-footer .footer-wrap{max-width:980px;margin:0 auto;padding:0 24px;display:flex;gap:18px;align-items:flex-start;justify-content:space-between}
    .site-footer .col{flex:1}
    .site-footer h4{margin:0 0 8px;font-size:15px;color:var(--muted)}
    .site-footer a{color:var(--accent);text-decoration:none}
    .site-footer .copyright{color:#889;font-size:13px}
    .back-to-top{position:fixed;right:18px;bottom:18px;background:var(--accent);color:#fff;border-radius:999px;padding:10px 12px;border:0;box-shadow:0 8px 20px rgba(11,92,255,0.18);cursor:pointer;display:none;z-index:80}
    @media(max-width:700px){.site-footer .footer-wrap{flex-direction:column;gap:12px}}