.ring-calculator {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
    margin-bottom: 50px;
}
.ring-calculator h2 {
    color: #333;
}
.ring-calculator .form-label {
    font-size: 16px;
    color: #333;
}
.ring-calculator .form-input, .ring-calculator .form-select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    margin-bottom: 20px;
    border-radius: 5px;
    border: 1px solid #ddd;
}
.ring-calculator .calculate-button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
}
.ring-calculator .calculate-button:hover {
    background-color: #0056b3;
}
/* 他のスタイルは変更せず、.resultクラスから背景色の定義を削除 */
.ring-calculator .result {
    color: #333;
    font-size: 18px;
    font-weight: bold;
    padding: 15px;
    margin-top: 20px;
    margin-bottom: 20px;
    border-radius: 5px;
    /* 背景色を初期状態では無くす */
}
/* 計算結果表示後の背景色を定義するための新しいクラス */
.result-background {
    background-color: #edf4f2;
}
/*タブがある場合*/
.tab {
    overflow: hidden;
    border: 1px solid #ccc;
    background-color: #f1f1f1;
}
.tab button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: 0.3s;
    font-size: 17px;
}
.tab button:hover {
    background-color: #ddd;
}
.tab button.active {
    background-color: #ccc;
}
.tabcontent {
    display: none;
    padding: 6px 12px;
    border: 1px solid #ccc;
    border-top: none;
}
.form-input, .calculate-button {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
.calculate-button {
    background-color: #007bff;
    color: white;
    cursor: pointer;
}
.calculate-button:hover {
    background-color: #0056b3;
}
@media (min-width: 600px) {
    .ring-calculator {
        max-width: 400px;
        margin: auto;
        background-color: #fff;
        box-shadow: 0 0 10px rgba(0,0,0,0.1);
        margin-bottom: 50px;
    }
}


/************************************
*各ツール紹介アイコン
************************************/
/*style.cssに移動*/