body {
  font-family: "Segoe UI", Arial, "Yu Gothic", Meiryo, sans-serif;
  background: #fdf6e3;
  margin: 0;
  color: #586e75;
}

.header {
  background: #eee8d5;
  padding: 2rem 1rem 1.5rem 1rem;
  border-bottom: 1px solid #d3cfcf;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.site-title {
  font-size: 2.5rem;
  color: #657B83;
  font-weight: bold;
  margin-bottom: 0.5rem;
  letter-spacing: 0.03em;
}

.site-subtitle {
  font-size: 1.2rem;
  color: #839496;
  margin: 0 0 1.5rem 0;
}
.en-subtitle {
  display: inline-block;
  color: #93a1a1;
  font-size: 0.96em;
}

.primary-btn {
  display: inline-block;
  background: #268BD2;
  color: #fff;
  font-size: 1rem;
  padding: 0.55em 1.4em;
  border-radius: 25px;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.primary-btn:hover, .primary-btn:focus {
  background: #859900;
  color: #fff;
}

.main-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  background: #f5f5f5;
  border-bottom: 1px solid #e0e0e0;
  padding: 1em 0;
  margin-bottom: 2.5rem;
}
.nav-link {
  color: #657b83;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.18s;
  padding: 0.3em 0.8em;
  border-radius: 8px;
}
.nav-link.active,
.nav-link:hover,
.nav-link:focus {
  background: #e3f6fd;
  color: #268BD2;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
}

@media (min-width: 700px) {
  .content-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 3px 14px rgba(150, 150, 150, 0.12);
  padding: 2rem 1.5rem 1.5rem 1.5rem;
  min-height: 170px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.card h2 {
  margin-top: 0;
  color: #268BD2;
  font-size: 1.4rem;
}
.card p {
  margin: 0.7em 0 0 0;
  color: #586e75;
  font-size: 1.06rem;
}