body {
    background-color: #f0f4f8;
    color: #333333;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.container {
    width: 680px;
    margin: 20px auto;
    padding: 10px;
}

header {
    background-color: #2b3a4a;
    color: #ffffff;
    text-align: center;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 20px;
}

header h1 {
    font-size: 32px;
    margin-top: 0;
    margin-bottom: 5px;
    color: #ffffff;
}

header p {
    color: #d1d8e0;
    font-size: 16px;
    margin-top: 0;
    margin-bottom: 15px;
}

nav {
    margin-top: 15px;
}

nav a {
    color: #ffffff;
    background-color: #3e5269;
    padding: 8px 16px;
    margin: 0 5px;
    text-decoration: none;
    font-size: 14px;
    border-radius: 6px;
}

.card {
    background-color: #ffffff;
    border: 1px solid #dcdcdc;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 20px;
}

.center {
    text-align: center;
}

.mypic {
    border-radius: 50%;
    border: 3px solid #2b3a4a;
    margin-bottom: 15px;
}

h2 {
    color: #2b3a4a;
    font-size: 24px;
    margin-top: 0;
    margin-bottom: 10px;
}

p {
    font-size: 15px;
    color: #444444;
    line-height: 1.5;
}

hr {
    border: 0;
    height: 1px;
    background-color: #e2e8f0;
    margin: 15px 0;
}

.proj,
.hobby {
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
}

.proj h3,
.hobby h3 {
    color: #1e3a5f;
    font-size: 17px;
    margin-top: 0;
    margin-bottom: 6px;
}

.btn {
    background-color: #2b3a4a;
    color: #ffffff;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 8px;
    font-size: 15px;
}