body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f9;
}

.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-box {
    background: white;
    padding: 30px;
    width: 320px;
    border-radius: 12px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

input, select, button {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    box-sizing: border-box;
}

button {
    background: #2563eb;
    color: white;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
}

.error {
    color: red;
}

.sidebar {
    width: 220px;
    height: 100vh;
    background: #111827;
    color: white;
    position: fixed;
    padding: 20px;
}

.sidebar a {
    display: block;
    color: white;
    text-decoration: none;
    margin-top: 15px;
}

.content {
    margin-left: 260px;
    padding: 30px;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 20px;
}