body {
  margin: 0;
  font-family: "Helvetica", "Arial", sans-serif;
  color: #333;
  background: #f9fbff;
}

header {
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: bold;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #333;
  font-size: 14px;
}

.hero {
  background: linear-gradient(135deg, #e6eeff 0%, #f9fbff 100%);
  text-align: center;
  padding: 100px 20px;
}

.hero h1 {
  font-size: 40px;
  font-weight: bold;
  margin-bottom: 20px;
}

.hero p {
  font-size: 18px;
  margin-bottom: 30px;
}

.btn-primary {
  background: #0066ff;
  color: #fff;
  padding: 14px 32px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 16px;
}

/* ---- FEATURES ---- */

.features {
  padding: 80px 20px;
  max-width: 1100px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.feature-box {
  flex: 1;
  background: #fff;
  padding: 40px 30px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  text-align: center;
  position: relative;
}

/* ---- CSSイラストアイコン ---- */

.icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  position: relative;
}

.icon.star::before {
  content: "⭐";
  font-size: 50px;
}

.icon.calendar::before {
  content: "📅";
  font-size: 50px;
}

.icon.target::before {
  content: "🎯";
  font-size: 50px;
}

/* ---- SERVICE SECTION ---- */

.section {
  padding: 80px 20px;
  max-width: 900px;
  margin: auto;
  text-align: center;
}

.service-item {
  background: #ffffff;
  padding: 30px;
  margin-top: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  text-align: left;
  position: relative;
}

/* ---- COMING SOON ---- */

.coming-soon {
  position: absolute;
  top: 0;
  right: 0;
  background: #ff4848;
  color: white;
  padding: 6px 14px;
  border-radius: 0 12px 0 12px;
  font-size: 12px;
  font-weight: bold;
}

.btn-secondary {
  display: inline-block;
  background: #004bcc;
  color: #fff;
  padding: 10px 22px;
  border-radius: 6px;
  margin-top: 10px;
  text-decoration: none;
  font-size: 14px;
}

/* ---- CTA ---- */

.cta {
  text-align: center;
  padding: 80px 20px;
  background: #eef4ff;
}

footer {
  text-align: center;
  padding: 20px;
  background: #fafafa;
  font-size: 14px;
  color: #666;
}

/* ---------- Mobile Optimized ---------- */
@media (max-width: 768px) {

  /* Header */
  header {
    padding: 12px 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .logo {
    font-size: 20px;
  }

  nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }

  nav a {
    margin-left: 0;
    font-size: 13px;
  }

  /* Hero */
  .hero {
    padding: 56px 16px 44px;
  }

  .hero h1 {
    font-size: 26px;
    line-height: 1.35;
    margin-bottom: 14px;
  }

  .hero p {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
  }

  .btn-primary {
    display: inline-block;
    width: 100%;
    max-width: 320px;
    text-align: center;
    padding: 14px 0;
    font-size: 15px;
    border-radius: 10px;
  }

  /* Features */
  .features {
    padding: 48px 16px;
    flex-direction: column;
    gap: 16px;
  }

  .feature-box {
    padding: 22px 18px;
  }

  .icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 14px;
  }

  .icon.star::before,
  .icon.calendar::before,
  .icon.target::before {
    font-size: 42px;
  }

  /* Section */
  .section {
    padding: 48px 16px;
  }

  .service-item {
    padding: 20px 16px;
    margin-top: 18px;
  }

  .coming-soon {
    font-size: 11px;
    padding: 6px 12px;
  }

  .btn-secondary {
    width: 100%;
    max-width: 320px;
    text-align: center;
    padding: 12px 0;
    border-radius: 10px;
  }

  /* CTA */
  .cta {
    padding: 56px 16px;
  }

  footer {
    padding: 16px;
    font-size: 12px;
  }
}