* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
               "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  color: #1f2937;
  background: linear-gradient(180deg, #f7f8fa 0%, #eef2f7 100%);
  line-height: 1.8;
}

.container {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}

.card {
  width: 100%;
  max-width: 820px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 20px;
  padding: 48px 32px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: #6b7280;
}

h1 {
  margin: 0 0 24px;
  font-size: 38px;
  line-height: 1.3;
  color: #111827;
}

h2 {
  margin: 0 0 10px;
  font-size: 18px;
  color: #111827;
}

.lead {
  font-size: 17px;
  margin: 0;
}

.section {
  padding-top: 22px;
  margin-top: 22px;
  border-top: 1px solid #e5e7eb;
}

a {
  color: #1d4ed8;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.footer {
  text-align: center;
  padding: 20px;
  font-size: 13px;
  color: #6b7280;
}

@media (max-width: 640px) {
  .card {
    padding: 32px 20px;
    border-radius: 16px;
  }

  h1 {
    font-size: 30px;
  }

  .lead {
    font-size: 16px;
  }
}