:root {
  color-scheme: light;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  color: #1c1c1e;
  background: #ffffff;
}

h1 {
  font-size: 1.6rem;
  margin-bottom: 0.25rem;
}

h2.lang-label {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-top: 3rem;
  margin-bottom: 0.5rem;
}

.tagline {
  opacity: 0.7;
  margin-bottom: 2.5rem;
}

.updated {
  opacity: 0.6;
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

h3 {
  font-size: 1.05rem;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

p {
  margin: 0.5rem 0 1rem;
}

hr {
  margin: 3rem 0;
  border: none;
  border-top: 1px solid #d1d1d6;
}

a {
  color: #007aff;
}

.nav {
  margin-bottom: 2rem;
  font-size: 0.9rem;
}

.card {
  display: block;
  border: 1px solid #d1d1d6;
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1rem 0;
  text-decoration: none;
  color: inherit;
}

.card h3 {
  margin-top: 0;
  color: #007aff;
}

.card p {
  margin-bottom: 0;
  opacity: 0.8;
  font-size: 0.95rem;
}

.footer-links {
  margin-top: 3rem;
  font-size: 0.9rem;
  opacity: 0.8;
}

/* ===== プロダクト紹介ページ用 ===== */

.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero-icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: 1.75rem;
  margin-bottom: 0.15rem;
}

.hero .subtitle {
  opacity: 0.6;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.hero .lead {
  max-width: 480px;
  margin: 0 auto 1.5rem;
  opacity: 0.85;
}

.badges {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.badge {
  display: inline-block;
  border: 1px solid #d1d1d6;
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  font-size: 0.8rem;
  opacity: 0.75;
}

.cta {
  display: inline-block;
  background: #007aff;
  color: #fff;
  border-radius: 12px;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.95rem;
}

.cta.disabled {
  background: #8e8e93;
  opacity: 0.6;
  pointer-events: none;
}

.screenshot-scroll {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  margin: 2rem -1.25rem;
  padding: 0 1.25rem 0.5rem;
  -webkit-overflow-scrolling: touch;
}

.screenshot-scroll img {
  height: 380px;
  width: auto;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
}

section.features {
  margin: 2.5rem 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 480px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

.feature {
  border: 1px solid #d1d1d6;
  border-radius: 12px;
  padding: 1.1rem 1.25rem;
}

.feature h3 {
  margin-top: 0;
  font-size: 0.95rem;
}

.feature p {
  margin: 0;
  font-size: 0.88rem;
  opacity: 0.75;
}

.section-title {
  text-align: center;
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
}

.disclaimer {
  font-size: 0.78rem;
  opacity: 0.55;
  margin-top: 3rem;
}

.support {
  text-align: center;
  border: 1px solid #d1d1d6;
  border-radius: 12px;
  padding: 1.5rem;
  margin: 2rem 0;
}

.support p {
  margin-bottom: 1rem;
}

.support img {
  height: 40px;
  width: auto;
  border: 0;
}