* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: #263544;
  font-family: Arial, "Helvetica Neue", "Yu Gothic", Meiryo, sans-serif;
  background: #fff;
}

.site-header {
  display: flex;
  min-height: 92px;
  padding: 12px clamp(18px, 4vw, 64px);
  align-items: center;
  justify-content: space-between;
  background: #fff;
  border-bottom: 1px solid #dce3e9;
}

.site-logo {
  display: block;
  width: min(230px, 48vw);
  height: auto;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  color: #10375f;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-underline-offset: 7px;
}

.hero {
  width: 100%;
  overflow: hidden;
  background: #eef2f4;
  line-height: 0;
}

.hero img {
  display: block;
  width: 100%;
  height: auto;
  max-height: calc(100vh - 92px);
  object-fit: contain;
  object-position: center;
}

main {
  min-height: 350px;
}

.home-copy,
.news-content {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
  padding: 54px 0 70px;
  line-height: 1.0;
}

.home-copy h1,
.news-content h1 {
  margin: 0 0 26px;
  color: #10375f;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  letter-spacing: 0.04em;
}

.home-copy p {
  margin: 0 0 10px;
  font-size: 1.02rem;
}

.news-item {
  padding: 24px 0;
  border-top: 1px solid #dce3e9;
}

.news-item:last-child {
  border-bottom: 1px solid #dce3e9;
}

.news-item time {
  color: #687786;
  font-size: 0.9rem;
}

.news-item h2 {
  margin: 8px 0;
  color: #10375f;
  font-size: 1.2rem;
}

.site-footer {
  padding: 24px 20px;
  color: #fff;
  text-align: center;
  background: #10375f;
}

@media (max-width: 640px) {
  .site-header {
    min-height: 76px;
    padding: 10px 16px;
  }

  .site-logo {
    width: 170px;
  }

  .site-nav {
    gap: 18px;
  }

  .hero img {
    max-height: calc(100vh - 76px);
  }

  .home-copy,
  .news-content {
    padding-top: 38px;
  }
}