body {
    font-family: sans-serif;
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: auto;
    background: #fff;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1, h2 {
    color: #2c3e50;
}

.form-container {
    margin-bottom: 30px;
    padding: 20px;
    background-color: #ecf0f1;
    border-radius: 5px;
}

input, select, button {
    display: block;
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box; /* paddingを含めた幅計算に */
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: #2980b9;
}

.subscription-item {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 15px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.item-info {
    flex-grow: 1;
}
.item-info h3 { margin: 0 0 5px 0; }
.item-info p { margin: 0; font-size: 14px; color: #777; }

.item-usage {
    margin-left: 20px;
    display: flex;
    align-items: center;
}

.item-usage input {
    width: 180px;
    margin-right: 10px;
}

.item-result {
    width: 100%;
    margin-top: 15px;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 4px;
    font-size: 14px;
    display: none; /* 初期状態では非表示 */
}

.summary {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #ecf0f1;
    text-align: right;
    font-size: 20px;
}