:root{
  --blue:#1f3b73; /* deep blue */
  --blue-600:#2b5fb8;
  --gray-50:#f6f7f9;
  --gray-200:#e5e7eb;
  --gray-700:#374151;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,Arial,sans-serif;background:var(--gray-50);color:var(--gray-700)}
header{background:var(--blue);color:#fff;padding:20px}
header h1{margin:0;font-size:1.4rem}
nav{background:#1f2937;display:flex;gap:10px;flex-wrap:wrap}
nav a{color:#fff;text-decoration:none;padding:12px 16px;border-bottom:3px solid transparent}
nav a.active,nav a:hover{border-bottom-color:var(--blue-600)}
.container{max-width:1000px;margin:24px auto;padding:0 16px}
.card{background:#fff;border:1px solid var(--gray-200);border-radius:12px;padding:16px}
.grid{display:grid;gap:16px}
.grid.cols-3{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
button, .btn{
  background:var(--blue-600);color:#fff;border:none;border-radius:10px;
  padding:10px 14px;cursor:pointer;font-weight:600
}
footer{margin-top:40px;padding:20px;text-align:center;color:#889; }
input,select,textarea{width:100%;padding:10px;border:1px solid var(--gray-200);border-radius:10px;background:#fff}
label{font-weight:600;margin:8px 0 4px;display:block}