:root {
  --bg: #ffffff;
  --paper: #ffffff;
  --soft: #f7f8fa;
  --ink: #1f2933;
  --muted: #69727d;
  --line: #d9e0e8;
  --navy: #17324d;
  --navy-soft: #eef3f7;
  --accent: #386f75;
  --note: #fff8e8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.86;
}

a {
  color: var(--navy);
  font-weight: 700;
  text-decoration-thickness: 0.06em;
  text-underline-offset: 0.22em;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  align-items: center;
  display: flex;
  gap: 20px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1040px;
  padding: 12px 20px;
}

.brand {
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--navy);
}

.hero {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.92) 42%, rgba(255, 255, 255, 0.32) 74%, rgba(255, 255, 255, 0.18) 100%),
    url("https://www.calcataborgomedievale.com/heroai.png") center right / cover no-repeat;
  border-bottom: 1px solid var(--line);
  min-height: 560px;
}

.hero-inner {
  margin: 0 auto;
  max-width: 1040px;
  padding: 120px 20px 110px;
}

.hero h1 {
  color: var(--navy);
  font-size: clamp(34px, 5vw, 58px);
  letter-spacing: 0;
  line-height: 1.24;
  margin: 0 0 18px;
  max-width: 720px;
}

.lead {
  color: #344054;
  font-size: 19px;
  max-width: 660px;
}

.container {
  margin: 0 auto;
  max-width: 920px;
  padding: 46px 20px 60px;
}

.article h1,
.article h2,
.article h3 {
  color: var(--navy);
  line-height: 1.45;
}

.article h1 {
  font-size: 34px;
}

.article h2 {
  border-left: 3px solid var(--navy);
  font-size: 25px;
  margin: 42px 0 16px;
  padding-left: 14px;
}

.article h3 {
  font-size: 19px;
  margin: 28px 0 8px;
}

.article p,
.article li {
  font-size: 16px;
}

.small {
  color: var(--muted);
  font-size: 13px;
}

.callout {
  background: var(--navy-soft);
  border: 1px solid var(--line);
  margin: 28px 0;
  padding: 20px;
}

.warn {
  background: var(--note);
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 20px 0;
}

.card {
  border: 1px solid var(--line);
  padding: 18px;
}

.card h3 {
  margin-top: 0;
}

.cta {
  background: var(--soft);
  border: 1px solid var(--line);
  margin: 34px 0 10px;
  padding: 22px;
}

.button {
  background: transparent;
  border: 1px solid var(--navy);
  color: var(--navy);
  display: inline-block;
  font-weight: 800;
  margin-top: 4px;
  padding: 8px 13px;
  text-decoration: none;
}

.button:hover {
  background: var(--navy);
  color: #fff;
}

.site-footer {
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  padding: 26px 20px 34px;
}

.site-footer a {
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.92) 56%, rgba(255, 255, 255, 0.64) 100%),
      url("https://www.calcataborgomedievale.com/heroai.png") center right 35% / cover no-repeat;
    min-height: 500px;
  }

  .hero-inner {
    padding: 82px 20px 74px;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}