/* 基本的なスタイルリセット */
body, h1, h2, h3, p, ul {
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #000;
    background-color: #6ea7a1;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
}

header {
    background: #004d99;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

nav {
    background: #003366;
    color: #fff;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 1rem 0;
}

nav li a {
    color: #fff;
    text-decoration: none;
    padding: 0 1.5rem;
}

main {
    padding: 2rem 0;
}

section {
    background: #fff;
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

section h2 {
    color: #004d99;
    border-bottom: 2px solid #004d99;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.practice-item {
    margin-bottom: 1.5rem;
}

.practice-item h3 {
    color: #003366;
    margin-bottom: 0.5rem;
}

footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
}