body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: #f1f3f6;
    color: #333;
}
.header {
    background: #1f2937;
    color: white;
    padding: 20px 40px;
    text-align: center;
}
.container {
    max-width: 850px;
    margin: 60px auto;
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}
h1 {
    margin-top: 0;
    font-size: 32px;
    text-align: center;
    color: #1f2937;
}
p {
    font-size: 16px;
    line-height: 1.6;
    text-align: center;
    color: #555;
}
.button-group {
    margin-top: 35px;
    text-align: center;
}
.btn {
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 8px;
    font-size: 16px;
    margin: 8px;
    display: inline-block;
}
.btn-primary {
    background: #2563eb;
    color: white;
}
.btn-primary:hover {
    background: #1e4fcf;
}
.btn-secondary {
    background: #e5e7eb;
    color: #111;
}
.btn-secondary:hover {
    background: #d5d6d8;
}
footer {
    margin-top: 40px;
    text-align: center;
    font-size: 13px;
    color: #777;
}