body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 20px;
    background: #f4f7f6;
    color: #333;
}

h1, h2 {
    text-align: center;
    color: #1e293b;
}

input, select {
    width: 320px;
    display: block;
    margin: 12px auto;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 14px;
}

button {
    display: block;
    margin: 15px auto;
    padding: 12px 24px;
    background: #2ecc71;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #27ae60;
}

nav, .back-link {
    text-align: center;
    margin-top: 20px;
}

a {
    color: #3498db;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    text-decoration: underline;
}

table {
    width: 80%;
    max-width: 800px;
    margin: 20px auto;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background: #1e293b;
    color: white;
}