* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: #f7f9fc;
  color: #1f2937;
  line-height: 1.6;
}

header {
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
}

.nav {
  max-width: 960px;
  margin: auto;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  font-size: 20px;
  color: #1d4ed8;
  text-decoration: none;
}

.nav a {
  margin-left: 16px;
  font-size: 14px;
  text-decoration: none;
  color: #374151;
}

main {
  max-width: 820px;
  margin: 48px auto;
  padding: 0 20px;
}

.box {
  background: #ffffff;
  padding: 28px;
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.05);
}

.notice {
  font-size: 13px;
  color: #6b7280;
  margin-top: 12px;
}

section {
  margin-top: 40px;
}

footer {
  border-top: 1px solid #e5e7eb;
  margin-top: 60px;
  padding: 24px 20px;
  text-align: center;
  font-size: 13px;
  background: #ffffff;
}

footer a {
  margin: 0 8px;
  text-decoration: none;
  color: #1d4ed8;
}