* {
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: #f8f9fa;
}
header {
    background: #2c3e50;
    color: white;
    padding: 1rem 2rem;
    text-align: center;
}
nav {
    background: #34495e;
    padding: 0.5rem;
}
nav a {
    color: white;
    text-decoration: none;
    margin: 0 1rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background 0.3s;
}
nav a:hover, nav a.active {
    background: #2980b9;
}
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}
form {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}
form label {
    display: block;
    margin-top: 1rem;
    font-weight: bold;
}
form input, form select, form textarea {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.3rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}
form button {
    background: #3498db;
    color: white;
    border: none;
    padding: 0.7rem 1.5rem;
    border-radius: 4px;
    margin-top: 1rem;
    cursor: pointer;
}
form button:hover {
    background: #2980b9;
}
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-top: 1rem;
}
th, td {
    text-align: left;
    padding: 0.8rem;
    border-bottom: 1px solid #ddd;
}
th {
    background: #ecf0f1;
    cursor: pointer;
    user-select: none;
}
th:hover {
    background: #d5dbdb;
}
.pagination {
    margin-top: 1rem;
    text-align: center;
}
.pagination a, .pagination span {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin: 0 0.2rem;
    text-decoration: none;
    border: 1px solid #ddd;
    color: #3498db;
}
.pagination span.current {
    background: #3498db;
    color: white;
}
.search-box {
    margin-bottom: 1rem;
}
.search-box input {
    width: 300px;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}
@media (max-width: 768px) {
    .search-box input {
        width: 100%;
    }
    nav a {
        display: block;
        margin: 0.2rem 0;
    }
}