* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

body {
font-family: "Segoe UI", Tahoma, sans-serif;
background: #f1f4f9;
color: #1a1a1a;
}

.top-header {
background: linear-gradient(135deg, #002147, #003366);
color: white;
text-align: center;
padding: 40px 20px;
}

.top-header h1 {
font-size: 26px;
margin-bottom: 8px;
}

main {
max-width: 900px;
margin: auto;
padding: 40px 20px;
}

.signin-section {
background: white;
padding: 30px;
border-radius: 10px;
text-align: center;
box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.signin-section form {
max-width: 400px;
margin: auto;
}

.signin-section input {
width: 100%;
padding: 12px;
margin-bottom: 12px;
border: 1px solid #ccc;
border-radius: 6px;
}

.signin-section button {
width: 100%;
padding: 12px;
background: #003366;
color: white;
border: none;
border-radius: 6px;
cursor: pointer;
}

.links-section {
display: flex;
justify-content: center;
gap: 20px;
margin-top: 30px;
}

.icon-card {
background: white;
padding: 20px;
border-radius: 10px;
width: 150px;
text-align: center;
box-shadow: 0 8px 20px rgba(0,0,0,0.06);
}

footer {
text-align: center;
padding: 20px;
background: #e0e5ec;
margin-top: 40px;
}

.logout-btn {
margin-top: 20px;
padding: 10px 20px;
background: #c0392b;
color: white;
border: none;
border-radius: 6px;
cursor: pointer;
}