body {
    font-family:"BIZ UDPMincho", serif;
    font-weight:400;
    background:linear-gradient(to bottom, #e9e9e9, #d9d9d9);
    height: 100vh;
    line-height: 1.6;
}
h1 {
    font-family:"BIZ UDPGothic", Arial,sans-serif;
    font-size: 1.4em;
    height:22.4px;
}

.signup-wrapper {
    max-width: 720px;
    margin: 4rem auto 1.5rem auto;
    padding: 2.5rem 2rem;
    background: #fff;
    border: 1px solid #e4e4e4;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgb(0 0 0 / .08);
}

/* 見出し */
.signup-wrapper h1 {
    font-size: 1.6rem;
    margin-top: 0;
    margin-bottom: 1.6rem;
    text-align: center;
}

/* ラベル */
.signup-wrapper label {
    display: block;
    margin-bottom: .4rem;
    font-weight: 700;
    font-size: .93rem;
}

/* テキスト入力・パスワード入力 */
.signup-wrapper input[type="text"],
.signup-wrapper input[type="email"],
.signup-wrapper input[type="password"] {
    width: 90%;
    padding: .6rem .8rem;
    margin-bottom: 0.3em;
    border: 1px solid #c3c3c3;
    border-radius: 4px;
    font-size: .95rem;
    font-family: inherit;
    transition: border-color .2s ease;
    line-height: 1.4;
}
.signup-wrapper input:focus {
    outline: none;
    border-color: #007508;
    box-shadow: 0 0 0 2px rgb(0 117 8 / .15);
}

/* エラーメッセージ */
.errorlist {
    margin: 0 0 1rem 0;
    padding: .8rem 1rem;
    list-style: none;
    background: #ffecec;
    border: 1px solid #f5c2c2;
    color: #cc0000;
    border-radius: 4px;
    font-size: .85rem;
}

/* 送信ボタン */
.signup-wrapper button[type="submit"] {
    margin: .5rem auto 0 auto;
    padding: .4rem 2rem .4rem 1.4rem;
    font-size: 0.8rem;
    border: none;
    border-bottom: solid 2px rgb(0, 68, 5);
    border-radius: 4px;
    cursor: pointer;
    background: linear-gradient(to bottom, #00aa0b, #00980a);
    color: #fff;
    transition: background .2s ease, transform .1s ease;
    display: block;
    font-weight: bold;
}
.signup-wrapper button:hover {
  background-image: linear-gradient(to bottom, #00980a, #006e07);background-color: #00aa0b
}
.signup-wrapper button:active {
    transform: translateY(2px);
    -webkit-transform: translateY(2px);
    border-bottom: none;
}

.signup-wrapper .helptext{
    color: #555;
    font-size: .75rem;
    line-height: 1.45;
}
.signup-wrapper ul{
    margin: 0;
    color: #555;
    font-size: .65rem;
    line-height: 1.45;
    padding-inline-start:1rem;
}

.with-gap {
    margin-top: 20px; /* メール入力欄とパスワードの間 */
}
.form-group {
    margin-bottom: 13px;
}
.login{
    color: #007508;
    text-decoration: none;
    font-size: 0.8rem;
}
.login:hover {
    text-decoration: underline;
}
#back-button-container {
    text-align: center;
}
#backButton {
    padding: .4rem 1.4rem;
    font-size: 0.8rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-align: center;
    background-color: transparent;
    color: rgb(167, 0, 0);
    display: inline-block;
}
#backButton:hover {
    text-decoration: underline;
}

/* ---------- レスポンシブ対応（スマホ） ---------- */
@media (max-width: 480px) {
    .signup-wrapper {
        margin: 2.5rem 1rem 1.5rem 1rem;
        padding: 2rem 1.2rem;
    }
    .signup-wrapper h1 { font-size: 1.2rem; }
}