*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-gunmetal-dark);
  background-image: var(--pattern-line);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-sand);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

a:hover,
a:focus-visible {
  color: var(--color-sand-light);
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-sand);
}

h1 { font-size: clamp(2.25rem, 6vw, 4rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.375rem); }

p { margin-bottom: var(--space-md); }
p:last-child { margin-bottom: 0; }

ul, ol { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

:focus-visible {
  outline: 2px solid var(--color-sand);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 10000;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-olive);
  color: var(--color-sand);
  font-family: var(--font-heading);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-md);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.section {
  padding-block: var(--space-3xl);
}

.section--dark {
  background: var(--color-gunmetal);
}

.section--olive {
  background: var(--color-olive-dark);
}

.section__header {
  margin-bottom: var(--space-2xl);
}

.section__header--center {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

.section__tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-olive-light);
  background: rgba(74, 80, 56, 0.4);
  padding: var(--space-xs) var(--space-md);
  border-left: 3px solid var(--color-sand);
  margin-bottom: var(--space-md);
}

.section__desc {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  margin-top: var(--space-md);
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--space-4xl);
  }
}