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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    padding: 20px;
    max-width: 1000px;
    margin: 0 auto;
    background: #fff;
    color: #333;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    margin-bottom: 20px;
    border-bottom: 1px solid #ddd;
}

header a {
    color: #333;
    text-decoration: none;
    font-weight: bold;
}

header nav a {
    margin-left: 15px;
    font-weight: normal;
}

header nav a:hover {
    text-decoration: underline;
}

h1 { font-size: 1.5em; margin-bottom: 10px; }
h2 { font-size: 1.2em; margin-bottom: 10px; color: #666; }
h3 { font-size: 1.1em; margin: 20px 0 10px; }

.container {
    padding: 20px 0;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="password"],
select {
    padding: 8px 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
}

button {
    padding: 8px 16px;
    background: #337ab7;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

button:hover {
    background: #286090;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid #ddd;
}

th {
    background: #f5f5f5;
    font-weight: bold;
}

tr:hover {
    background: #f9f9f9;
}

.alert {
    padding: 10px 15px;
    background: #f2dede;
    color: #a94442;
    border: 1px solid #ebccd1;
    border-radius: 4px;
    margin-bottom: 15px;
}

a {
    color: #337ab7;
}

a:hover {
    color: #23527c;
}