@charset "UTF-8";

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "游ゴシック Medium", "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", "Meiryo", sans-serif;
  line-height: 1.6;
  font-size: 16px;
  background-color: #fff;
}

#outer {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#wrapper {
  flex: 1;
}

#header-container {
  margin: 0 auto;
  width: 694px;
}

header {
  background: url("img/universe_space04.png") center center / cover no-repeat;
  color: #fff;
  padding: 60px 0 40px 0;  /* 少し縮めた */
}

#head-inner {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
  line-height: 1.6; /* 少し詰める */
}

h1 {
  font-size: 42px;  /* 少し小さく */
  font-weight: bold;
  margin: 0.2em 0;
  color: #f3e6d2;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.6);
}

.description {
  font-size: 20px;  /* 若干小さく */
  color: #f3f2eb;
  margin: 0.3em 0;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.event-date {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 0.2em;
}

.event-location {
  font-size: 16px;
  margin-top: 0;
}

nav.navbar {
  background: linear-gradient(to bottom, rgba(0,0,0,0.6), rgba(0,0,0,0.9));
  text-align: center;
  padding: 10px 0;
  font-family: Georgia, serif;
}

nav.navbar ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: inline-flex;
  gap: 40px;
}

nav.navbar li {
  display: inline;
}

nav.navbar a {
  color: white;
  text-decoration: none;
  font-size: 20px;
  font-style: italic;
}

nav.navbar a:hover {
  text-decoration: underline;
}

.intro-paragraph {
  font-size: 17px;
  line-height: 1.7;
  color: #333;
  margin: 1.5em 0;
  padding: 0 0.5em;
}

h12 {
  font-size: 30px;
  margin: 1.5em 0 0.5em 0;
  padding: 4px 0;
  border-bottom: 1px solid #999;
}


h2 {
  font-size: 22px;
  margin: 1.5em 0 0.5em 0;
  padding: 4px 0;
  border-bottom: 1px solid #999;
}

h3 {
  font-size: 18px;
  margin-top: 1em;
}

h4 {
  font-size: 16px;
}

#content-wrapper {
  margin: 0 auto;
  width: 694px;
}

main {
  color: #333;
}

#inner {
  padding: 20px 0 0 0;
}

ul {
  margin: 0 0 0 1em;
  padding: 0;
}

li {
  list-style: disc;
}

p {
  margin: 1em 0;
}

img {
  max-width: 100%;
  height: auto;
  border: 0;
}

footer {
  font-size: 15px;
  text-align: center;
  margin-top: 60px;
  padding: 20px 0;
  background-color: #f1f1f1;
}

#organisers {
  margin-top: 60px;
}

#organisers h2 {
  font-size: 22px;
  margin-bottom: 0.5em;
  border-bottom: 1px solid #999;
}

#organisers ul {
  list-style: disc;
  margin-left: 1.5em;
  padding-left: 0;
  line-height: 1.6;
  color: #333;
}

blockquote {
  border: 1px solid #ccc;
  padding: 5px;
  margin: 10px;
}

@media screen and (max-width: 767px) {
  #header-container {
    margin: 0;
    width: 100%;
  }

  #head-inner {
    padding: 25px 10px;
  }

  #content-wrapper {
    margin: 0;
    width: 100%;
  }

  #inner {
    padding: 20px 10px 0 10px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 18px;
  }

  h3 {
    font-size: 16px;
  }

  h4 {
    font-size: 14px;
  }

  #organisers {
    width: 90%;
    margin-left: auto;
    margin-right: auto;
  }

  nav.navbar ul {
    flex-direction: column;
    gap: 10px;
  }
}