/* ========== Base ========== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  color: #222;
  background-color: #e5eef3; /* pale background for large-screen side space */
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========== Layout Shell ========== */

.page {
  min-height: 100vh;
  background-color: #ffffff;
  display: flex;
  flex-direction: column;
  padding: 0 1rem 2rem;
}

/* ========== Skip Link ========== */

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: #000;
  color: #fff;
  z-index: 1000;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* ========== Header & Navigation ========== */

.site-header {
  padding: 1rem 0;
  border-bottom: 1px solid #d5dde3;
}

.branding {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.4rem;
  margin: 0;
}

.logo {
  width: 48px;
  height: auto;
}

.primary-nav ul {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.primary-nav a {
  text-decoration: none;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  color: #184a63;
  background-color: #e4f2f7;
  display: inline-block;
}

.primary-nav a:hover,
.primary-nav a:focus {
  background-color: #cde4f1;
}

.primary-nav a[aria-current="page"] {
  font-weight: 600;
  background-color: #184a63;
  color: #fff;
}

/* ========== Hero & Subnav ========== */

.hero {
  margin: 1rem 0;
  border-radius: 0.75rem;
  overflow: hidden;
}

.subnav {
  margin-bottom: 1.5rem;
}

.subnav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.subnav a {
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid #d0dde5;
  color: #365568;
  background-color: #f5f9fc;
  display: inline-block;
  font-size: 0.95rem;
}

.subnav a:hover,
.subnav a:focus {
  background-color: #e4f0f8;
}

/* ========== Sections & Typography ========== */

.section {
  padding: 1.5rem 0;
  border-top: 1px solid #edf1f5;
}

.section-title {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.35rem;
}

h2 {
  margin-top: 0;
  font-size: 1.3rem;
}

h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

/* Side-by-side layout for sable/seal sections */

.side-by-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ========== Cards & Galleries ========== */

.gallery {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: 1fr; /* 1 column on small screens */
  gap: 1rem;
}

.card {
  background-color: #f7fbfe;
  border-radius: 0.75rem;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  display: flex;
  flex-direction: column;
}

.card figure {
  margin: 0;
}

.card-body {
  padding: 0.75rem 0.9rem 1rem;
}

.card-body p {
  margin: 0.3rem 0 0;
}

/* Featured 4-card grid section */

.feature-grid .grid {
  display: grid;
  grid-template-columns: 1fr; /* 1 column on small screens */
  gap: 1rem;
}

/* ========== Fun facts ========== */

.fun-facts {
  margin-top: 1rem;
  background-color: #f3f7fa;
  padding: 0.75rem 1rem;
  border-radius: 0.6rem;
}

.fun-facts ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
}

/* ========== Footer & Back to Top ========== */

.back-to-top {
  margin-top: 1.5rem;
  align-self: flex-end;
  text-decoration: none;
  font-size: 0.9rem;
  color: #27698a;
}

.back-to-top:hover,
.back-to-top:focus {
  text-decoration: underline;
}

.site-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid #d8e1e8;
  font-size: 0.9rem;
  color: #000000;
}

.muted {
  color: c;
}

/* ========== Environments page extras ========== */

/* Full-width figure that keeps aspect ratio nicely */
.full-width {
  margin: 1rem 0;
  border-radius: 0.75rem;
  overflow: hidden;
  position: relative;
}

/* Overlay heading on top of the image */
.overlay-text {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  padding: 0.4rem 0.75rem;
  border-radius: 0.5rem;
}

.overlay-text h2 {
  margin: 0;
  font-size: 1.1rem;
}

/* Slightly different feel for environments page */
body.green-theme {
  background-color: #e4f3e7;
}

body.green-theme .page {
  background-color: #ffffff;
}

/* ========== MEDIA QUERIES ========== */

/* --- Medium devices: ≥ 590px --- */
/* 2×2 grid for feature cards, horizontal nav, 2-column galleries */

@media (min-width: 590px) {
  .primary-nav ul {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .primary-nav li {
    margin-left: 0.5rem;
  }

  .subnav ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .feature-grid .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)); /* 2×2 middle grid */
  }

  .gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .side-by-side {
    flex-direction: row;
    align-items: center;
  }

  .side-by-side > * {
    flex: 1 1 0;
  }
}

/* --- Large devices: ≥ 790px --- */
/* Centered 790px layout and 3-column galleries */

@media (min-width: 790px) {
  body {
    background-color: #e0ebf3; /* side background color */
  }

  .page {
    max-width: 790px;
    margin: 0 auto;
    padding: 0 1.5rem 2.5rem;
    border-radius: 0 0 0.75rem 0.75rem;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
  }

  .gallery {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}