.check-hero {
  background: linear-gradient(180deg, #f7fbff 0%, #eef6ff 100%);
  padding: 48px 20px;
  font-family: "Noto Sans JP", sans-serif;
  color: #0f1f35;
}

.hero-inner {
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
}

.check-hero h1 {
  font-size: 40px;
  font-weight: 800;
  margin: 0 0 24px;
  letter-spacing: 0.08em;
}

.lead {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 14px;
}

.lead span {
  color: #0068d9;
}

.sub {
  font-size: 15px;
  color: #334155;
  margin: 0 0 34px;
}

.start-btn {
  width: 420px;
  max-width: 100%;
  height: 72px;
  margin: 0 auto 34px;
  background: linear-gradient(180deg, #0074f0 0%, #005bd3 100%);
  color: #fff;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 70px;
  font-size: 26px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 8px 18px rgba(0, 91, 211, 0.28);
}

.feature-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 34px;
}

.feature-card {
  background: #fff;
  border: 1px solid #dbe8f6;
  border-radius: 10px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  box-shadow: 0 4px 14px rgba(15, 31, 53, 0.06);
}

.feature-card .icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #eaf4ff;
  color: #0068d9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
  flex-shrink: 0;
}

.feature-card strong {
  display: block;
  font-size: 15px;
  color: #0068d9;
  margin-bottom: 4px;
}

.feature-card p {
  margin: 0;
  font-size: 12px;
  color: #475569;
  font-weight: 600;
}

.about-box {
  background: #fff;
  border: 1px solid #dbe8f6;
  border-radius: 10px;
  padding: 24px 28px;
  text-align: left;
  box-shadow: 0 4px 14px rgba(15, 31, 53, 0.06);
}

.about-box h2 {
  font-size: 18px;
  margin: 0 0 18px;
  font-weight: 800;
}

.about-box h2::before {
  content: "i";
  width: 22px;
  height: 22px;
  margin-right: 10px;
  border-radius: 50%;
  background: #0068d9;
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
}

.about-box p {
  font-size: 14px;
  line-height: 1.9;
  color: #334155;
  margin: 0;
}

.about-box strong {
  color: #0068d9;
}

.about-box hr {
  border: none;
  border-top: 1px dashed #d6e4f2;
  margin: 18px 0;
}

@media (max-width: 768px) {
  .check-hero h1 {
    font-size: 28px;
  }

  .lead {
    font-size: 17px;
  }

  .start-btn {
    height: 64px;
    font-size: 22px;
    gap: 36px;
  }

  .feature-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.diagnosis-image {
  display: block;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto 32px;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(15, 31, 53, 0.08);
}