body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    padding: 0;
    color: #333;
}
.container {
    width: 90%;
    max-width: 1200px;
    margin: 20px auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
h1, h2, h3 {
    color: #2c3e50;
}
.btn {
    display: inline-block;
    background: #e67e22;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 16px;
}
.btn:hover {
    background: #d35400;
}
.btn-primary {
    background: #2980b9;
}
.btn-primary:hover {
    background: #2471a3;
}
input, select, textarea {
    width: 100%;
    padding: 10px;
    margin: 8px 0 16px 0;
    display: inline-block;
    border: 1px solid #ccc;
    box-sizing: border-box;
    border-radius: 4px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}
table, th, td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}
th {
    background-color: #f2f2f2;
}