body {
    margin: 0;
    /* font-family: sans-serif; */
    font-family: "Meiryo", "メイリオ", sans-serif;
}

.header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background-color: #333;
    color: #fff;
}

.header h1 {
    margin: 0 0 0 12px;
    font-size: 20px;
}

/* ボタン */
button,
.btn {
    background-color: #787878;
    color: rgb(254, 254, 254);
    border: 0.1px solid #787878;
    border-radius: 3px;
    padding: 2px 8px;
    font-size: 12px;
}

.menu-button {
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
}

.menu {
    background-color: #f5f5f5;
    border-bottom: 1px solid #ddd;
}

.menu ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.menu li {
    border-top: 1px solid #ddd;
}

.menu a {
    display: block;
    padding: 12px 16px;
    text-decoration: none;
    color: #333;
}

.menu a:hover {
    background-color: #e9e9e9;
}

.hidden {
    display: none;
}

main {
    padding: 16px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th {
    background-color: #333;
    color: #fff;
    padding: 8px 12px;
}

td {
    padding: 8px 12px;
}

/* 行の交互色 */
tr:nth-child(even) {
    background-color: #f3f3f3;
}


input,
select,
textarea {
    font-family: "Meiryo", "メイリオ", sans-serif;
    font-size: 13px;
    padding: 6px 8px;
    border: 1px solid #aaa;
    border-radius: 3px;
    background-color: white;
    box-sizing: border-box;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #343a40;
    box-shadow: 0 0 0 2px rgba(52, 58, 64, .15);
}

.login-container {
    width: 320px;
    margin: 50px auto;
}

.login-container h2 {
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 12px;
}

.member-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.member-name {
    white-space: nowrap;
}

.short-number {
    width: 60px;
}