:root {
  --main-color: #4CAF50;
  --accent-color: #FF9800;
  --text-color: #333;
  --bg-color: #f9f9f9;
  --card-bg: #fff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

h1, h2, h3 {
  margin-top: 0;
}

.headline {
  background: var(--main-color);
  color: white;
  text-align: center;
  padding: 3rem 1rem;
}

.headline-image {
  margin: 2rem auto;
  max-width: 300px;
  border-radius: 18px;
}

.cta-button {
  display: inline-block;
  background: white;
  color: var(--main-color);
  padding: 0.75rem 1.5rem;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  margin-top: 1rem;
}

.section h2 {
  text-align: center;
  margin-bottom: 2rem;
}

.card-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
  flex: 1 1 260px;
  text-align: center;
}

.card-image {
  display: inline-block;
  margin: 0;
  padding: 0;
  max-height: 48px;
}

.card p {
  text-align: left;
}

.feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.feature {
  background: var(--card-bg);
  padding: 1.0rem;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
  flex: 1 1 300px;
  text-align: center;
}

.feature p {
  text-align: left;
}

.cta {
  background: var(--accent-color);
  color: white;
  text-align: center;
  padding: 3rem 1rem;
}

.links {
  padding: 1.0rem 0.5rem;
  text-align: center;
}

.centering {
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner {
  display: inline-block;
  margin: 0 auto;
  padding: 0;
}

a:link {
  color: #0066ff;
  text-decoration: none;
}
a:visited {
  color: #0066ff;
}
a:hover {
  color: #ff0000;
}
a:active {
  color: #ff8000;
}


footer {
  text-align: center;
  font-size: 0.9rem;
  color: #666;
  padding: 1rem;
}

ul, ol, dl {
  padding-left: 1rem;
  letter-spacing: normal;
  line-height: 1.4rem;
  text-align: left;
}

.gallery {
  background: var(--accent-color);
  color: white;
  text-align: center;
  padding: 3rem 1rem;
}

.gallery-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.image-card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 566px; /* 画像の元の幅に合わせる */
  box-sizing: border-box;
}

.image-card h2 {
  font-size: 1.2em;
  text-align: center;
  padding: 15px 10px 5px;
  color: var(--main-color);
  margin: 0;
}

.image-card .image-wrapper {
  width: 100%;
  height: auto;
  display: block;
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
}

.image-card p {
  text-align: center;
  padding: 5px 15px 15px;
  color: var(--main-color);
  margin: 0;
}

@media (max-width: 600px) {
  .card-list {
    flex-direction: column;
  }

  .card {
    flex: 1 1 auto;
  }

  .feature-list {
    flex-direction: column;
  }

  .feature {
    flex: 1 1 auto;
  }

  .headline-image {
    max-width: 90%;
  }
}

@media (min-width: 768px) {
  .gallery-container {
    justify-content: space-around;
  }

  .image-card {
    width: calc(50% - 10px); /* 2列表示 */
  }
}

@media (min-width: 1024px) {
  .image-card {
    width: calc(33.333% - 14px); /* 3列表示 */
  }
}