:root {
  --header-bg: #015723;
  --header-text: #ffffff;
  --header-line: #f6f6f6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.site-header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 0.9rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  color: var(--header-text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-mark {
  font-size: 0.9rem;
  line-height: 1;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font: 700 2rem/1 "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  letter-spacing: 1.2px;
}

.brand-tagline {
  font: 500 0.68rem/1.2 "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  letter-spacing: 1.8px;
  opacity: 0.9;
  text-transform: capitalize;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.header-nav a {
  color: var(--header-text);
  text-decoration: none;
  font: 700 20px "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding-bottom: 0.55rem;
  border-bottom: 2px solid transparent;
}

.header-nav a.active {
  border-bottom-color: var(--header-line);
}

.menu-toggle {
  display: none;
  width: 2.25rem;
  height: 2rem;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 0.32rem 0;
  background: var(--header-text);
}

@media (max-width: 920px) {
  .menu-toggle {
    display: block;
  }

  .header-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #01481d;
    padding: 0.75rem 1.5rem 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
  }

  .site-header {
    position: relative;
  }

  .header-nav.is-open {
    display: flex;
  }

  .brand-name {
    font-size: 1.55rem;
  }

  .brand-tagline {
    letter-spacing: 1.1px;
  }
}