:root {
  --bg: #f3f4ee;
  --surface: #ffffff;
  --ink: #18222f;
  --muted: #516374;
  --accent: #0b6e4f;
  --accent-soft: #d9eee7;
  --border: #d7dde3;
  --radius: 12px;
  --container: 1200px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #eef3f1 0%, var(--bg) 50%, #e8ece6 100%);
  line-height: 1.5;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.site-header {
  background: #ffffffdd;
  backdrop-filter: blur(5px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 0.4rem 0.7rem;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.main-nav a {
  text-decoration: none;
  color: var(--ink);
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: #063f2e;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1rem;
  padding: 1.5rem 0 2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.hero {
  background: linear-gradient(135deg, #f5fbf7, #edf4ef);
}

.span-5 {
  grid-column: span 5;
}

.span-3 {
  grid-column: span 3;
}

.span-2 {
  grid-column: span 2;
}

.embed-block {
  border: 1px dashed #7f95a8;
  background: #f8fafb;
  border-radius: 10px;
  padding: 0.75rem;
}

.embed-block iframe {
  display: block;
  width: 100%;
  min-height: 320px;
  border: 0;
  border-radius: 8px;
  background: #e7edf2;
}

.tour-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 0.8rem;
}

.tour-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem;
  background: #fcfdfc;
}

.button {
  display: inline-block;
  margin-top: 0.4rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
}

.artifact-item {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  margin-top: 1rem;
}

.artifact-item:first-of-type {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #f7faf8;
  color: var(--muted);
}

.site-footer .container {
  padding: 1rem 0 1.5rem;
}

@media (max-width: 900px) {
  .content-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .span-5,
  .span-3,
  .span-2 {
    grid-column: span 2;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-block;
  }

  .main-nav {
    display: none;
    width: 100%;
    padding-bottom: 0.6rem;
  }

  .main-nav.open {
    display: flex;
  }

  .nav-wrap {
    flex-wrap: wrap;
  }

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

  .span-5,
  .span-3,
  .span-2 {
    grid-column: span 1;
  }
}