* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: #1a5276;
    color: #fff;
    padding: 20px;
    margin: 0 -20px;
    text-align: center;
}

header h1 {
    font-size: 1.8rem;
}

nav {
    background-color: #2980b9;
    margin: 0 -20px;
    padding: 10px 20px;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

nav a {
    color: #fff;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

nav a:hover,
nav a.active {
    background-color: #1a5276;
}

main {
    padding: 30px 0;
    min-height: 400px;
}

footer {
    border-top: 1px solid #ddd;
    padding: 20px 0;
    margin-top: 30px;
    text-align: center;
    color: #666;
}

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

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

th {
    background-color: #f8f9fa;
    font-weight: 600;
}

tr:hover {
    background-color: #f5f5f5;
}

h2 {
    margin-bottom: 15px;
    color: #1a5276;
}

.placeholder-message {
    font-size: 1.1rem;
    color: #666;
    margin-top: 10px;
}