body {
    font-family: Arial, sans-serif;
    background: #f8f9fa;
    color: #222;
    margin: 0;
    padding: 0;
}
header {
    background: #2d3748;
    color: #fff;
    padding: 2rem 1rem 1rem 1rem;
    text-align: center;
}
main {
    max-width: 700px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
    padding: 2rem;
}
section {
    margin-bottom: 2rem;
}
footer {
    text-align: center;
    color: #888;
    padding: 1rem;
    background: #e2e8f0;
    border-top: 1px solid #cbd5e1;
    font-size: 0.95rem;
}
a {
    color: #3182ce;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
#submit-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    margin-top: 1rem;
    display: block;
    width: 100%;
    max-width: 200px;
    margin-left: auto;
    margin-right: auto;
}

#submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

#submit-btn:active {
    transform: translateY(1px);
}

#submit-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}