* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 20px;

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Hiragino Kaku Gothic ProN",
        "Yu Gothic",
        sans-serif;

    background: #f5f5f5;
    color: #222;
}

.login-container {
    width: 100%;
    max-width: 420px;

    margin: 60px auto;
    padding: 30px;

    background: #fff;

    border: 1px solid #ddd;
    border-radius: 10px;
}

.login-container h1 {
    margin-top: 0;
    margin-bottom: 25px;

    text-align: center;

    font-size: 26px;
}

.login-form-item {
    margin-bottom: 18px;
}

.login-form-item label {
    display: block;

    margin-bottom: 5px;

    font-weight: bold;
}

.login-form-item input {
    width: 100%;
    min-height: 46px;

    padding: 9px 10px;

    font-size: 16px;

    border: 1px solid #aaa;
    border-radius: 6px;
}

.login-button {
    width: 100%;
    min-height: 48px;

    margin-top: 8px;

    border: none;
    border-radius: 6px;

    background: #2468a9;
    color: #fff;

    font-size: 17px;

    cursor: pointer;
}

.login-button:hover {
    background: #19568f;
}

.login-message {
    margin-bottom: 18px;
    padding: 10px;

    border-radius: 5px;

    background: #f5f5f5;
}

.login-error {
    color: #b00020;
}


/* スマートフォン */
@media (max-width: 600px) {

    body {
        padding: 12px;
    }

    .login-container {
        margin: 25px auto;
        padding: 20px 16px;
    }

    .login-container h1 {
        font-size: 22px;
    }

}