body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: #f7f7f7;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

.header {
    width: 100%;
    background-color: #ffffff;
    border-bottom: 2px solid firebrick;
    text-align: center;
    padding-top: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header h1 {
    margin: 0;
    color: #005691;
    font-size: 1.8em;
    font-weight: 700;
}

.login-container {
    width: 100%;
    max-width: 450px;
    padding: 20px 20px;
    box-sizing: border-box;
}

.login-box {
    background-color: #ffffff;
    padding-left: 30px;
    padding-right: 30px;
    padding-top: 10px;
    padding-bottom: 25px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-top: 5px solid orange;
    margin-bottom: 20px;
}

.section-title {
    color: firebrick;
    font-size: 1.5em;
    font-weight: 700;
    border-left: 5px solid firebrick;
    padding-left: 10px;
    margin-bottom: 25px;
}

.input-group {
    margin-bottom: 10px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
}

.input-label{
    font-weight: bold;
}

.input-group input {
    width: 100%;
    padding: 10px 10px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    box-sizing: border-box;
    transition: border-color 0.3s;
    font-size: 1em;
}

.input-group input:focus {
    border-color: #005691;
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 86, 145, 0.2);
}

/* ログインボタン */
.login-button {
    width: 100%;
    padding: 12px;
    background-color: orange;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1.1em;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 15px;
    outline: none;
}

.login-button:hover {
    background-color: darkorange;
}

.login-button:focus{
    background-color: darkorange;
}

.register-link-box {
    background-color: #ffffff;
    padding-top: 5px;
    padding-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.register-text {
    font-size: 1em;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.register-button {
    display: inline-block;
    padding: 10px 25px;
    background-color: #1890ff;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 700;
    transition: background-color 0.3s;
    outline: none;
}

.register-button:hover {
    background-color: #096dd9;
}

.register-button:focus {
    background-color: #096dd9;
}

/* エラーメッセージ */
.error {
    color: #f5222d;
    font-size: 15px;
    height: 15px;
    padding-left: 5px;
    font-weight: normal;
}

/* フッター */
.footer {
    width: 100%;
    padding: 5px 0;
    background-color: #e8e8e8;
    text-align: center;
    margin-top: auto;
}

.copyright {
    font-size: 0.8em;
    color: #666;
    margin: 0;
}