body {
  font-family: Arial,
  "Hiragino Kaku Gothic ProN",
  "Hiragino Sans",
  Meiryo,
  sans-serif;
  font-size: 16px;
  margin: 0;
  padding: 0;
  background-color: #000;
  color: #f5f5f5;
  text-align: center;
}

.text-right {
  text-align: right;
}

.container {
  width: 820px;
  margin: 0 auto;
  padding: 50px 0 80px 0;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.logo {
  width: 200px;
  margin-right: 20px;
}
h1 {
  font-size: 40px;
  letter-spacing: 2px;
}

.main-info {
  margin-bottom: 20px;
}

.event-title {
  margin: 40px 0 0 0;
}
.event-title h2 {
  margin: 0;
}
.event-title h2 img {
  width: 100%;
}

.event-details dl {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  margin: 30px 0 0 0;
  padding: 0;
  text-align: left;
  font-size: 40px;
  font-weight: bold;
  letter-spacing: 2px;
}
.event-details dl dt {
  width: 17%;
  margin: 0;
}
.event-details dl dd {
  width: 83%;
  margin: 0;
}
.event-details dl dd span {
  font-size: 1.3em;
}
.event-details p {
  font-weight: bold;
  margin: 0;
}
.event-details p.url {
  margin-top: 10px;
  font-size: 45px;
  letter-spacing: 2px;
}
.event-details p.sewanin {
  margin-top: 2px;
  font-size: 17px;
}

.main-image {
  margin: 50px 0 0 0;
}

.main-art {
  width: 100%;
}

.overview {
  margin: 50px auto 0 auto;
  width: 600px;
}
.overview h3 {
  letter-spacing: 4px;
}
.overview dl {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  text-align: left;
  line-height: 1.5;
}
.overview dl dt {
  width: 25%;
  margin: 0 0 8px 0;
  padding: 0;
  font-weight: bold;
  letter-spacing: 1px;
}
.overview dl dd {
  width: 75%;
  margin: 0 0 8px 0;
  padding: 0;
}

.greeting {
  font-family: sans-serif;
  margin: 80px auto;
  padding: 20px;
  line-height: 1.6;
}
.greeting h2 {
  font-size: 24px;
  letter-spacing: 1em;
  padding-bottom: 10px;
  margin-bottom: 20px;
}
.greeting p {
  text-align: justify;
}
.greeting .greeting-head {
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
}
.greeting .greeting-head img {
  width: 160px;
}
.greeting .greeting-head div {
  padding-top: 20px;
  width: calc(100% - 260px);
  font-size: 1.2em;
}
.greeting .greeting-head div p {
  margin-top:  8px;
  margin-bottom: 0;
}
.greeting .greeting-head div p.yaku {
  text-align: right;
}
.greeting > p {
  text-indent: 1em;
  line-height: 1.7;
}

@media only screen and (min-width: 768px) {
  .sp {
    display: none;
  }
}

@media only screen and (max-width: 767px) {

  .pc {
    display: none;
  }

  body {
    font-size: 14px;
  }
  .container {
    width: 100%;
    padding: 50px 15px 80px 15px;
  }
  header {
    display: block;
    margin-bottom: 20px;
  }
  .logo {
    width: 140px;
    margin-right: 0;
  }
  h1 {
    font-size: 7vw;
    letter-spacing: 2px;
  }
  .event-title {
    margin-top: 25px;
  }
  .event-details dl {
    font-size: 5vw;
  }
  .event-details dl dt {
    width: 20%;
  }
  .event-details dl dd {
    width: 80%;
  }
    .event-details p.url {
    margin-top: 10px;
    font-size: 24px;
  }
  .event-details p.sewanin {
    margin-top: 2px;
    font-size: 12px;
  }
  .overview {
    width: 100%;
  }

  .greeting .greeting-head {
    display: block;
  }
  .greeting .greeting-head img {
    width: 220px;
  }
  .greeting .greeting-head div {
    width: auto;
  }
  
}