/* 共通フォント */
body {
  font-family: "Zen Kaku Gothic New", "Kokoro", sans-serif;
  color: #222;
  background: #f8fafc;
  line-height: 1.8;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Zen Kaku Gothic New", "Kokoro", sans-serif;
  font-weight: 700;
  color: #1a237e;
  margin-bottom: 0.7em;
}

h1 {
  font-size: 2.2rem;
}
h2 {
  font-size: 1.5rem;
  border-left: 6px solid #1976d2;
  padding: 0.8em 0 0.8em 0.7em;
  background: #e3f2fd;
  margin-top: 2em;
  margin-bottom: 1.2em;
  color: #1a237e;
  line-height: 1.3;
}
h3 {
  font-size: 1.2rem;
  color: #1976d2;
  margin-top: 1.5em;
}

section {
  margin-bottom: 2.5em;
  padding: 2em 0 1.5em 0;
  border-bottom: 1px solid #cfd8dc;
  background: #fff;
}

ul,
ol {
  margin-left: 1.5em;
  margin-bottom: 1em;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0.5em auto;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.2em;
}

footer {
  background: #1a237e;
  color: #fff;
  text-align: center;
  padding: 1.5em 0;
  font-size: 1em;
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.5rem;
  }
  h2 {
    font-size: 1.1rem;
    padding-left: 0.5em;
  }
  section {
    padding: 1em 0 0.7em 0;
  }
  .container {
    padding: 0 0.5em;
  }
}