/* =========================
   Header shell
   ========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid rgba(0,0,0,.06);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.logo img {
  display: block;
  height: 36px;
  width: auto;
}

/* =========================
   Navigation
   ========================= */
.nav-toggle { display: none; }

.main-nav {
  flex: 0 0 auto;
  z-index: 90;
}

.main-nav ul {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 6px 10px;
  list-style: none;
  background-color: var(--teal-200);
  border-radius: var(--radius-pill);
}

.main-nav li { display: inline-flex; }

.main-nav a {
  display: inline-block;
  text-decoration: none;
  font-weight: 600;
  line-height: 1;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  color: var(--teal-900);
  background: transparent;
  transition: background .15s ease, transform .15s ease;
}

.main-nav a:hover {
  background: rgba(255,255,255,.9);
  transform: translateY(-1px);
}

.main-nav a.is-active {
  background: #fff;
  color: #123;
  box-shadow: var(--shadow);
}

.main-nav li a:focus-visible {
  outline: 2px solid #4a8483;
  outline-offset: 2px;
}

body.nav-open { overflow: hidden; }

/* =========================
   Desktop (≥920px)
   ========================= */
@media (min-width: 920px) {
  .logo img { height: 40px; }

  .main-nav ul {
    gap: 2rem;
    padding: 0.5rem 1.25rem;
    background-color: #a7d3d1;
  }

  .main-nav li a {
    padding: 10px 12px;
    color: #0b2a28;
  }

  .main-nav li a:hover { color: #004d4d; }
}

/* =========================
   Mobile (≤920px)
   ========================= */
@media (max-width: 920px) {
  .site-header .container {
    display: grid;
    grid-template-areas:
      "logo"
      "nav";
    grid-template-columns: 1fr;
    row-gap: 8px;
    align-items: center;
  }

  .logo { display: none; }

  .main-nav {
    grid-area: nav;
    justify-self: stretch;
    max-width: 100%;
    min-width: 0;
    overflow: visible;
  }

  .main-nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 10px;
    padding: 8px 10px;
    width: 100%;
    background: var(--teal-200);
    border-radius: 9999px;
    box-shadow: var(--shadow);
  }

  .main-nav li { flex: 0 1 auto; }

  .main-nav a {
    font-size: 14px;
    padding: 8px 12px;
    white-space: nowrap;
    color: #0f2e2e;
  }

  .main-nav a.is-active {
    background: #fff;
    color: #123;
    box-shadow: none;
  }
}