/* ======== Google風モダンデザイン ======== */
body {
    font-family: 'Noto Sans JP', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* ======== 認証コンテナ ======== */
.auth-container {
    background-color: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 40px;
    width: 350px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s;
}

.auth-container:hover {
    transform: translateY(-5px);
}

/* ======== タイトル ======== */
.auth-box h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
}

/* ======== フォームグループ ======== */
.form-group {
    margin-bottom: 15px;
    text-align: left;
}

/* ======== 入力フィールド ======== */
input[type="text"], input[type="email"], input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    transition: border 0.2s;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus {
    border-color: #4285F4;
}

/* ======== ボタン ======== */
button.btn {
    width: 100%;
    background-color: #4285F4;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 12px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

button.btn:hover {
    background-color: #3367D6;
}

/* ======== エラーメッセージ ======== */
.error-message {
    color: red;
    font-size: 14px;
    margin-bottom: 15px;
}

/* ======== パスワードを忘れた場合リンク ======== */
.forgot-password {
    font-size: 14px;
    color: #666;
    text-decoration: none;
    display: block;
    margin-bottom: 15px;
}

.forgot-password:hover {
    text-decoration: underline;
}

/* ======== アカウント切り替えリンク ======== */
.switch-link {
    font-size: 14px;
    color: #666;
}

.switch-link a {
    color: #4285F4;
    text-decoration: none;
}

.switch-link a:hover {
    text-decoration: underline;
}