/* グローバル設定 */
* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* トップバナー */
.top-banner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #AF0000;
    color: white;
    padding: 12px 20px;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    height: 60px; /* 高さを固定 */
    display: flex;
    align-items: center; /* 中央揃え */
}

.login-container {
    background: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 300px;
    text-align: center;
}

h1 {
    margin-bottom: 20px;
    font-size: 24px;
    color: #333;
}

.form-group {
    margin-bottom: 15px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
    color: #555;
}

input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

.error-message {
    color: red;
    font-size: 14px;
    margin-top: 10px;
    display: none;
}