* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.75;
  color: #1a1a1a;
  background: #e8f4f8;
}

a {
  color: #1565c0;
}

figure {
  margin: 0;
}

.hero {
  background: linear-gradient(180deg, #b8dce8 0%, #e8f4f8 100%);
  padding: 40px 20px 32px;
  text-align: center;
}

.hero-inner {
  max-width: 960px;
  margin: 0 auto;
}

.app-icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.hero h1 {
  margin: 16px 0 8px;
  font-size: 1.6rem;
  color: #1a1a1a;
}

.hero .tagline {
  margin: 0 0 24px;
  font-size: 1rem;
  color: #333;
}

.store-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  align-items: center;
  margin-bottom: 16px;
}

.screenshots-section {
  margin-top: 0;
  width: 100%;
}

.screenshots {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 0;
}

.store-buttons a {
  display: inline-block;
  line-height: 0;
}

.store-buttons img {
  height: 48px;
  width: auto;
}

.store-buttons .coming-soon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 160px;
  height: 48px;
  padding: 0 16px;
  font-size: 0.9rem;
  font-weight: bold;
  color: #555;
  background: #eee;
  border: 1px solid #ccc;
  border-radius: 8px;
  text-decoration: none;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

section {
  margin-top: 40px;
}

section h2 {
  font-size: 1.25rem;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #fff8e7;
}

.intro p {
  margin: 0;
  padding: 16px 18px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.audience {
  margin: 0;
  padding-left: 1.25rem;
}

.audience li {
  margin-bottom: 10px;
}

.audience li:last-child {
  margin-bottom: 0;
}

.audience strong {
  color: #0d5f7a;
}

.features {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.features li {
  background: #fff;
  border-radius: 10px;
  padding: 14px 18px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.features strong {
  color: #0d5f7a;
}

.screenshot-card {
  background: #fff;
  border-radius: 12px;
  padding: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  text-align: center;
}

.screenshot-card img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
}

.screenshot-card figcaption {
  margin: 0 0 6px;
  font-size: 0.85rem;
  color: #444;
  line-height: 1.4;
}

.screenshot-card figcaption strong {
  font-weight: bold;
}

.note {
  margin-top: 24px;
  padding: 14px 18px;
  background: #fff8e7;
  border: 1px solid #e0d8c0;
  border-radius: 10px;
  font-size: 0.9rem;
}

footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  font-size: 0.9rem;
  color: #555;
  text-align: center;
  border-top: 1px solid #c5dde6;
}

footer nav a {
  margin: 0 10px;
}

@media (max-width: 767px) {
  .hero {
    padding: 28px 12px 20px;
  }

  .store-buttons {
    margin-bottom: 10px;
  }

  .screenshots-section {
    width: 100%;
  }

  main {
    padding: 0 12px 48px;
  }

  footer {
    padding-left: 12px;
    padding-right: 12px;
  }

  .screenshot-card {
    padding: 8px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    margin: 0;
  }

  .screenshot-card figcaption {
    font-size: 0.8rem;
    padding: 0 2px 6px;
    margin: 0 0 6px;
    text-align: center;
  }

  .screenshot-card img {
    display: block;
    width: 100%;
    max-width: none;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    box-shadow: none;
  }
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 1.85rem;
  }

  .store-buttons img {
    height: 54px;
  }

  .screenshots {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .screenshot-card img {
    max-width: 240px;
    margin-left: auto;
    margin-right: auto;
  }
}

@media (min-width: 1024px) {
  .screenshots {
    grid-template-columns: repeat(4, 1fr);
  }
}