body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    color: #333;
}

header {
    background: #1a252f;
    color: white;
    padding: 15px 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

nav a {
    color: #ecf0f1;
    text-decoration: none;
    margin: 0 15px;
    font-weight: 600;
    transition: color 0.3s;
}

nav a:hover { color: #3498db; }

.container {
    max-width: 900px;
    margin: 30px auto;
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

input, select {
    width: 100%;
    padding: 10px;
    margin: 10px 0 20px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    background-color: #2980b9;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    width: 100%;
    transition: background-color 0.3s;
}

button:hover { background-color: #3498db; }

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

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

th { background-color: #2c3e50; color: white; }