:root { --primary: #1a3a5f; --accent: #d32f2f; --bg: #f0f2f5; }
        body { font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", sans-serif; background-color: var(--bg); padding: 20px; color: #333; }
        .container { max-width: 950px; margin: 0 auto; background: white; padding: 40px; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }
        h1 { text-align: center; color: var(--primary); margin-bottom: 30px; font-size: 1.8rem; border-bottom: 3px solid var(--primary); padding-bottom: 15px; }
        
        .form-section-title { font-weight: bold; color: var(--primary); border-left: 5px solid var(--primary); padding-left: 10px; margin: 25px 0 15px; }
        .form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 15px 25px; }
        .form-group { display: flex; flex-direction: column; margin-bottom: 10px; }
        label { font-weight: bold; margin-bottom: 5px; font-size: 0.85rem; color: #444; }
        input, select { padding: 12px; border: 1px solid #ccc; border-radius: 8px; font-size: 1rem; transition: border 0.3s; }
        input:focus { border-color: var(--primary); outline: none; }
        
        .calc-btn { width: 100%; padding: 20px; background: var(--primary); color: white; border: none; border-radius: 8px; font-size: 1.2rem; font-weight: bold; cursor: pointer; margin-top: 30px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
        .calc-btn:hover { background: #122a45; transform: translateY(-1px); }

        .result-box { margin-top: 40px; display: none; border: 1px solid #ddd; border-radius: 12px; overflow: hidden; }
        .result-header { background: var(--primary); color: white; padding: 15px; text-align: center; font-size: 1.2rem; font-weight: bold; }
        .result-content { padding: 25px; background: #fff; }
        .result-item { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid #eee; }
        .result-total { display: flex; justify-content: space-between; padding: 20px 0; border-top: 2px solid #333; margin-top: 10px; font-weight: bold; font-size: 1.5rem; color: var(--accent); }
        .note { font-size: 0.8rem; color: #666; margin-top: 20px; background: #f9f9f9; padding: 15px; border-radius: 8px; }
/* モバイル対応（メディアクエリ）を追加 */
@media screen and (max-width: 600px) {
    .container { padding: 20px 15px; }
    h1 { font-size: 1.4rem; }
    .form-grid { grid-template-columns: 1fr; } /* 1列に変更 */
    .calc-btn { font-size: 1rem; padding: 15px; }
    .result-total { font-size: 1.2rem; flex-direction: column; text-align: center; }
    .result-total span:last-child { margin-top: 10px; }
}

/* 入力フィールドのフォーカス時に青く光らせる（視認性アップ） */
input:focus, select:focus {
    border-color: #3498db;
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}