/* === common.css の中身 === */

body {
    background: linear-gradient(to bottom, #f0f4f8, #d6e4ff);
    font-family: "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
}

header {
    background-color: #222;
    color: white;
    padding: 20px;
    text-align: center;
}

nav {
    background-color: #0040aa;
    padding: 12px;
    text-align: center;
}   

nav a {
    display: inline-block;
    color: white;
    margin: 0 10px;
    padding: 8px 16px;
    text-decoration: none;
    font-weight: bold;
    border-radius: 6px;
    transition: 0.3s;
}

nav a:hover {
    background-color: #ffd700;
    color: #333;
}

nav a[aria-current="page"] {
    background-color: #ffd700;
    color: #333;
}

nav ul {
    display: flex;
    justify-content: center;
    gap: 10px;
    list-style: none;
    padding: 0;
    margin: 0;
}

h1 {
    margin: 0;
    font-size: 28px;
}

footer {
    text-align: center;
    padding: 20px;
    color: gray;
    font-size: 14px;
}